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WO2019172366A1 - Appareil de réception d'énergie, dispositif vestimentaire et système d'alimentation électrique sans contact - Google Patents

Appareil de réception d'énergie, dispositif vestimentaire et système d'alimentation électrique sans contact Download PDF

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Publication number
WO2019172366A1
WO2019172366A1 PCT/JP2019/009057 JP2019009057W WO2019172366A1 WO 2019172366 A1 WO2019172366 A1 WO 2019172366A1 JP 2019009057 W JP2019009057 W JP 2019009057W WO 2019172366 A1 WO2019172366 A1 WO 2019172366A1
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WIPO (PCT)
Prior art keywords
circuit
voltage
switch
power
capacitor
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PCT/JP2019/009057
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English (en)
Japanese (ja)
Inventor
義範 鶴田
壮亮 中村
隆宏 宮浦
Original Assignee
株式会社ダイヘン
学校法人法政大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from JP2018228149A external-priority patent/JP7201414B2/ja
Application filed by 株式会社ダイヘン, 学校法人法政大学 filed Critical 株式会社ダイヘン
Priority to US16/978,547 priority Critical patent/US11101699B2/en
Publication of WO2019172366A1 publication Critical patent/WO2019172366A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • the present invention relates to a power receiving device, a wearable device, and a non-contact power feeding system.
  • the magnetic field resonance method has attracted attention as one of power feeding methods for transmitting power from a power transmitting device to a power receiving device in a contactless manner.
  • each of the power transmission device and the power reception device includes a resonance circuit, and electric power is transmitted using the resonance phenomenon of these resonance circuits. Therefore, power can be transmitted most efficiently when the resonance frequency of the resonance circuit included in each of the power transmission device and the power reception device is equal to the frequency of the transmitted signal.
  • the resonance frequency of the resonance circuit is a specific value determined by the element constants of the coil and the capacitor included in the resonance circuit. Therefore, for example, when one power receiving device receives power from a plurality of power transmission devices, if the frequency of a signal transmitted from each power transmission device is different, the resonance frequency of the resonance circuit of the power reception device is different from the frequency of the transmission signal. There is a problem in that the transmission efficiency is lowered and the transmission efficiency is lowered.
  • the inductance value varies according to the deformation of the coil, and as a result, the resonance frequency of the resonance circuit varies. Therefore, also in this case, a deviation occurs between the resonance frequency of the resonance circuit of the power receiving apparatus and the frequency of the transmission signal, and transmission efficiency can be reduced.
  • a method of using a capacitor included in the resonance circuit as a variable capacitor can be considered.
  • the resonance frequency of the resonance circuit of the power reception device can be adjusted according to the frequency of the transmission signal from each power transmission device.
  • the resonance frequency can be adjusted to the frequency of the transmission signal by adjusting the capacitance value of the capacitor so as to compensate for the variation in the inductance value of the coil.
  • Patent Document 1 discloses a configuration in which a variable capacitor is connected in parallel to a resonant capacitor.
  • the variable capacitance capacitor disclosed in Patent Document 1 includes a plurality of capacitors arranged in parallel, and the combined capacitance value is adjusted by selectively switching the connection relation of the plurality of capacitors with a switch. .
  • possible composite capacitance values are discrete, and the capacitance values cannot be continuously adjusted.
  • a mechanical variable capacitor is known as a capacitor whose capacitance value can be continuously adjusted.
  • an increase in circuit size is inevitable with a variable capacitor.
  • an object of the present invention is to provide a power receiving device, a wearable device, and a non-contact power feeding system that can improve transmission efficiency while suppressing an increase in circuit size.
  • a power receiving device includes a variable capacitance circuit, and a power receiving coil that forms a resonance circuit together with the variable capacitance circuit, and the variable capacitance circuit includes a first capacitor and a second capacitor connected in parallel to each other.
  • a first switch connected in series to one end of the first capacitor, and a switch control circuit for controlling on and off of the first switch, the comparison result between the reference voltage and the AC voltage applied to the second capacitor
  • a switch control circuit including a first comparator for supplying a first control voltage to the first switch.
  • the first switch is periodically turned on and off as the AC voltage applied to the second capacitor varies. Further, the length of time that the first switch is on is controlled according to the height of the reference voltage. As a result, the apparent combined capacitance value of the variable capacitance circuit can be continuously controlled, and the resonance frequency of the resonance circuit can be adjusted. Therefore, compared to a configuration using, for example, a mechanical variable capacitor, it is possible to improve power transmission efficiency while suppressing an increase in circuit size.
  • variable capacitance circuit further includes a second switch connected in series to the other end side of the first capacitor, and the switch control circuit includes a reference voltage and an AC voltage and an antiphase voltage whose phase is opposite to that of the reference voltage.
  • a second comparator that supplies a second control voltage to the second switch according to the comparison result may be further included to control on and off of the second switch.
  • the second switch is periodically turned on and off as the antiphase voltage varies. Further, the length of time during which the second switch is on is controlled according to the height of the reference voltage. Therefore, compared with a configuration including one switch, the combined capacitance value of the variable capacitance circuit can be controlled in a wide range, and the resonance frequency of the resonance circuit can be adjusted in a wide range.
  • variable capacitance circuit further includes a second switch connected in series to the other end side of the first capacitor, and the switch control circuit compares the inverted reference voltage obtained by inverting the sign of the reference voltage with the AC voltage.
  • a second comparator for supplying a second control voltage to the second switch may be further included to control on and off of the second switch.
  • the second switch is periodically turned on and off as the AC voltage fluctuates. Further, the length of time during which the second switch is on is controlled according to the level of the inversion reference voltage. Therefore, compared with a configuration including one switch, the combined capacitance value of the variable capacitance circuit can be controlled in a wide range, and the resonance frequency of the resonance circuit can be adjusted in a wide range.
  • variable capacitance circuit includes a third switch connected in series with the first switch on one end side of the first capacitor, a fourth switch connected in series with the second switch on the other end side of the first capacitor,
  • the first comparator supplies a first control voltage to the fourth switch
  • the second comparator supplies a second control voltage to the third switch
  • the first switch and the third switch and
  • the second switch and the fourth switch may be connected such that the directions of the parasitic diodes are opposite to each other.
  • the paths on both sides of the first capacitor are conducted only when all of the four switches are on. Accordingly, unintended leakage of charges from the first capacitor can be prevented.
  • the switch control circuit further includes an AND circuit that receives the first control voltage and the second control voltage and outputs the third control voltage, and the AND circuit replaces the first control voltage and the second control voltage.
  • a third control voltage may be supplied to the first switch and the second switch.
  • the first switch and the second switch respectively connected to both sides of the first capacitor operate synchronously, it is possible to prevent unintended leakage of charges from the first capacitor.
  • the power receiving device includes a voltage / current detector that detects a voltage applied to the resonance circuit and a current flowing through the resonance circuit, and a reference that reduces a phase difference between the voltage and the current detected by the voltage / current detector. And a reference voltage generation circuit for generating a voltage.
  • the reference voltage is generated so that the resonance degree of the resonance circuit of the power receiving apparatus is increased, and thereby the resonance frequency of the resonance circuit is adjusted. Accordingly, power transmission efficiency can be improved.
  • the power receiving device further includes a detector that detects the power received by the power receiving device, and a reference voltage generation circuit that generates a reference voltage so that the power detected by the detector is equal to or higher than a predetermined level. It may be.
  • the reference voltage is generated based on the power received by the power receiving device, and thereby the resonance frequency of the resonance circuit of the power receiving device is adjusted. Accordingly, power transmission efficiency can be improved.
  • the reference voltage generation circuit may further include a reference voltage adjustment circuit that adjusts the reference voltage in accordance with fluctuations in the amplitude value of the AC voltage.
  • the reference voltage is adjusted according to the fluctuation, so that the duty ratio determined by the ratio between the amplitude value of the AC voltage and the reference voltage is kept constant. Can do.
  • the reference voltage adjustment circuit includes a rectifier circuit that rectifies the AC voltage, a voltage divider circuit that divides the rectified voltage, and a differential amplifier circuit that differentially amplifies the divided voltage. May be.
  • the reference voltage proportional to the amplitude value of the AC voltage can be generated.
  • a wearable device includes the above power receiving device.
  • the resonance frequency is adjusted by controlling the capacitance value of the variable capacitance circuit so as to compensate for the variation. be able to. Accordingly, power transmission efficiency can be improved.
  • a non-contact power feeding system includes the above power receiving device, a power supply circuit, and a power transmission unit, a power transmission device that transmits power to the power reception device, and first power supplied from the power supply circuit to the power transmission unit.
  • a first detector for detecting the second power a second detector for detecting the second power received by the power receiving device, a reference voltage generating circuit for generating a reference voltage so that the second power with respect to the first power is increased, Is provided.
  • the reference voltage is determined based on the ratio between the power supplied by the power transmission device and the power received by the power reception device, and thereby the resonance frequency of the resonance circuit of the power reception device is adjusted. Accordingly, power transmission efficiency can be improved.
  • a power receiving device a wearable device, and a non-contact power feeding system that can improve transmission efficiency while suppressing an increase in circuit size.
  • FIG. 6 is a diagram illustrating a circuit configuration of a first modification of the variable capacitance circuit shown in FIG. 2.
  • FIG. 5 is a diagram illustrating a circuit configuration of a second modification of the capacitance variable circuit shown in FIG. 2.
  • FIG. 10 is a diagram illustrating a circuit configuration of a third modification of the capacitance variable circuit shown in FIG. 2.
  • FIG. 1 It is a block diagram which shows the control system which controls the capacitance value of the resonant capacitor shown by FIG. It is a figure which illustrates the whole structure of the non-contact electric power feeding system which concerns on 2nd Embodiment of this invention. It is a figure which illustrates the whole structure of the non-contact electric power feeding system which concerns on 3rd Embodiment of this invention. In the non-contact electric power feeding system which concerns on 1st Embodiment of this invention, it is a figure which illustrates the circuit structure of the reference voltage adjustment circuit which adjusts a reference voltage so that the designated duty ratio may be maintained.
  • FIG. 1 is a diagram illustrating an overall configuration of a non-contact power feeding system according to a first embodiment of the present invention.
  • a non-contact power feeding system 1 shown in the figure includes a power transmission device 2 that transmits power and a power receiving device 3 that receives the power in a contactless manner.
  • the power transmission device 2 includes, for example, a power supply circuit 10 and a power transmission unit 20.
  • the power supply circuit 10 generates and outputs an AC power supply voltage having a predetermined frequency (for example, about several kHz to several hundred MHz).
  • the AC power supply voltage is supplied to the power transmission unit 20.
  • the power transmission unit 20 includes a power transmission coil 21 and a resonance capacitor 22.
  • the power transmission coil 21 and the resonance capacitor 22 are connected in series to form an LC series resonance circuit.
  • the power receiving device 3 includes, for example, a power receiving unit 40, a rectifying / smoothing circuit 50, and a load 60.
  • the power receiving unit 40 includes a power receiving coil 41 and a resonance capacitor 42.
  • the power receiving coil 41 and the resonance capacitor 42 are connected in series to constitute an LC series resonance circuit.
  • the resonant capacitor 42 is configured by a variable capacitance circuit capable of continuously adjusting the capacitance value, as will be described later. Therefore, by controlling the capacitance value of the resonance capacitor 42, the resonance frequency of the resonance circuit included in the power reception unit 40 (hereinafter also referred to as “power reception side resonance circuit”) can be adjusted. Details of the configuration of the resonant capacitor 42 will be described later.
  • the rectifying / smoothing circuit 50 rectifies and smoothes the power received by the power receiving unit 40.
  • the load 60 consumes power supplied from the power receiving unit 40 via the rectifying / smoothing circuit 50.
  • the load 60 is included in the power receiving device 3, but the load 60 may not be included in the power receiving device 3.
  • electric power may be stored in a charging target such as a battery or a capacitor.
  • the power transmission coil 21 of the power transmission unit 20 and the power reception coil 41 of the power reception unit 40 are magnetically coupled, and the power transmission unit 20 and the power reception unit 40 resonate at a specific resonance frequency.
  • electric power is supplied from the power transmission apparatus 2 to the power receiving apparatus 3 by a magnetic field resonance method.
  • variable capacitance circuit constituting the resonant capacitor 42
  • FIG. 2 is a diagram illustrating a circuit configuration of a variable capacitance circuit that constitutes the resonant capacitor 42.
  • FIG. 3 is a graph illustrating various voltage fluctuations related to the variable capacitance circuit constituting the resonant capacitor 42. In the graph shown in FIG. 3, each vertical axis represents voltage (V), and each horizontal axis represents time (s).
  • the variable capacitance circuit 100 shown in FIG. 2 includes capacitors C1 and C2, transistors Tr1 and Tr2, and a switch control circuit 110.
  • the capacitor C1 (first capacitor) and the capacitor C2 (second capacitor) are connected in parallel.
  • the capacitor C1 is a capacitor that has an inherent capacitance value, but whose apparent capacitance value can be adjusted.
  • the capacitor C2 is a capacitor having a specific capacitance value and a fixed capacitance value.
  • the voltage applied across the capacitor C1 is V1
  • the voltage applied across the capacitor C2 is V2.
  • a detector (not shown) detects a voltage V2 (AC voltage) applied across the capacitor C2.
  • a voltage ⁇ V2 reverse phase voltage obtained by reversing the phase of the voltage V2 is generated. That is, the voltage V2 and the voltage ⁇ V2 are alternating voltages having the same frequency and having opposite phases (see FIGS. 3A and 3B).
  • the transistor Tr1 (first switch) is a switch connected in series to one end of the capacitor C1.
  • the transistor Tr2 (second switch) is a switch connected in series to the other end of the capacitor C1.
  • MOSFETs Metal-oxide-semiconductor Field-Effect Transistors
  • the transistors Tr1 and Tr2 are not limited to MOSFETs, and other field effect transistors or bipolar transistors. Or any element as long as it has a switch function. The same applies to transistors Tr3 and Tr4 described later.
  • the transistor Tr1 has a drain connected to one end of the capacitor C1, a source connected to one end of the capacitor C2, and a gate supplied with the control voltage Vg1 (first control voltage).
  • the transistor Tr2 has a drain connected to the other end of the capacitor C1, a source connected to the other end of the capacitor C2, and a gate supplied with a control voltage Vg2 (second control voltage).
  • the transistors Tr1 and Tr2 are turned on and off according to the levels of the control voltages Vg1 and Vg2.
  • the switch control circuit 110 controls the length of time that the transistors Tr1 and Tr2 are on or off according to the height of the reference voltage Vref.
  • the switch control circuit 110 includes comparators OP1 and OP2.
  • the comparators OP1 and OP2 are constituted by operational amplifiers, for example.
  • the comparator OP1 (first comparator) is supplied with the voltage V2 at the inverting input terminal and supplied with the reference voltage Vref at the non-inverting input terminal, and outputs the control voltage Vg1 from the output terminal according to the comparison result.
  • the control voltage Vg1 becomes a high-level voltage (for example, a power supply voltage) that turns on the transistor Tr1
  • the reference voltage Vg1 When the voltage Vref is lower than the voltage V2, the voltage becomes a low level voltage (eg, 0 V) that turns off the transistor Tr1.
  • the transistor Tr1 is periodically switched on and off as the voltage V2 varies.
  • the comparator OP2 (second comparator) is supplied with the voltage ⁇ V2 at the inverting input terminal and the reference voltage Vref at the non-inverting input terminal, and outputs the control voltage Vg2 from the output terminal according to the comparison result.
  • the control voltage Vg2 becomes a high level voltage that turns on the transistor Tr2
  • the reference voltage Vref is the voltage ⁇
  • it is lower than V2 it is a low level voltage that turns off the transistor Tr2.
  • the transistor Tr2 is periodically switched on and off as the voltage -V2 varies.
  • the electrical conduction and non-conduction of the one end side and the other end side of the capacitor C1 are periodically switched.
  • the voltage V1 applied across the capacitor C1 varies in the same manner as the voltage V2 when the transistors Tr1 and Tr2 are both on, but is constant when one of the transistors Tr1 and Tr2 is off. (See FIG. 3E). Therefore, the apparent capacitance value of the capacitor C1 is reduced as compared with the case where both ends of the capacitor C1 are always electrically connected.
  • the height of the reference voltage Vref by adjusting the height of the reference voltage Vref, the length of time that each of the control voltages Vg1 and Vg2 is at the high level (that is, the duty ratio) Can be adjusted.
  • the higher the reference voltage Vref the longer the time during which each of the control voltages Vg1 and Vg2 is at a high level.
  • the time during which both the transistors Tr1 and Tr2 are on is lengthened, and the apparent capacitance value of the capacitor C1 is increased.
  • the lower the reference voltage Vref the shorter the time during which each of the control voltages Vg1 and Vg2 is at a high level. As a result, the time during which both the transistors Tr1 and Tr2 are on is shortened, and the apparent capacitance value of the capacitor C1 is decreased.
  • the apparent capacitance value of the capacitor C1 is the smallest when there is a time when both the transistors Tr1 and Tr2 are off (for example, 0F), and when both the transistors Tr1 and Tr2 are always on.
  • the apparent capacitance value at this time becomes equal to the specific capacitance value of the capacitor C1. Therefore, if the specific capacitance values of the capacitors C1 and C2 are Cx and Cy, respectively, the apparent combined capacitance value Cz of the capacitors C1 and C2 can take a continuous value in a range of Cy ⁇ Cz ⁇ Cx + Cy. That is, according to the variable capacitance circuit 100, the capacitance value can be continuously adjusted according to the height of the reference voltage Vref.
  • variable capacitance circuit 100 it is not always necessary to provide a switch on both ends of the capacitor C1, and it is sufficient that a switch is provided on at least one end.
  • a switch is provided on one end side, the waveform of the voltage applied to both ends of the capacitor C1 is the same as the voltage V1 on the positive or negative side compared to the waveform of the voltage V1 shown in FIG. The other side is the same as the voltage V2. Even with such a configuration, the apparent capacitance value of the capacitor C1 can be continuously adjusted.
  • the configuration in which the switches are provided on both ends of the capacitor C1 can adjust the apparent capacitance value of the capacitor C1 in a wider range than the configuration in which the switches are provided on one end.
  • variable capacitance circuit 100 when the control voltages Vg1 and Vg2 are generated, the voltage V2 applied across the capacitor C2 and the voltage ⁇ V2 obtained by reversing the phase of the voltage V2 are respectively compared with the reference voltage Vref.
  • method A the method of generating the control voltages Vg1 and Vg2 is not limited to this.
  • method B there is a method in which a reference voltage Vref and an inverted reference voltage ⁇ Vref obtained by inverting the sign of the reference voltage Vref are respectively compared with the voltage V2. May be used.
  • FIG. 4 is a diagram illustrating a circuit configuration of a first modification of the variable capacitance circuit shown in FIG.
  • variable capacitance circuit 100A includes a switch control circuit 110A instead of the switch control circuit 110, as compared with the variable capacitance circuit 100 shown in FIG.
  • the switch control circuit 110A includes comparators OP3 and OP4 instead of the comparators OP1 and OP2.
  • the comparators OP3 and OP4 are composed of operational amplifiers, for example, like the comparators OP1 and OP2.
  • the comparator OP3 (first comparator) is supplied with the voltage V2 at the inverting input terminal and the reference voltage Vref at the non-inverting input terminal, and outputs the control voltage Vg1 from the output terminal according to the comparison result.
  • the comparator OP4 (second comparator) an inverted reference voltage ⁇ Vref obtained by inverting the sign of the reference voltage Vref is supplied to an inverting input terminal, and a voltage V2 is supplied to a non-inverting input terminal.
  • the control voltage Vg2 is output from the output terminal.
  • FIG. 5 is a diagram illustrating a circuit configuration of a second modification of the variable capacitance circuit shown in FIG.
  • the variable capacitance circuit 100B according to the second modification example further includes a transistor Tr3 and a transistor Tr4, as compared with the variable capacitance circuit 100A.
  • the transistor Tr3 (third switch) is a switch connected in series with the transistor Tr1 on one end side of the capacitor C1.
  • the transistor Tr4 (fourth switch) is a switch connected in series with the transistor Tr2 on the other end side of the capacitor C1.
  • the transistor Tr1 and the transistor Tr3, and the transistor Tr2 and the transistor Tr4 are connected so that the parasitic diodes between the drain and source of the transistor are opposite to each other.
  • the transistor Tr3 has a drain connected to the drain of the transistor Tr1, a source connected to one end of the capacitor C1, and a gate supplied with the control voltage Vg2.
  • the transistor Tr4 has a drain connected to the drain of the transistor Tr2, a source connected to the other end of the capacitor C1, and a gate supplied with the control voltage Vg1.
  • the transistors Tr3 and Tr4 are turned on and off according to the levels of the control voltages Vg2 and Vg1.
  • the transistor Tr1 and the transistor Tr4 operate synchronously, and the transistor Tr2 and the transistor Tr3 operate synchronously.
  • the paths on both sides of the capacitor C1 are both Only when the four transistors Tr1 to Tr4 are all turned on, the paths on both sides of the capacitor C1 are both conducted.
  • the paths on both sides of the capacitor C1 are both conductive or non-conductive. That is, since one path is not conductive and the other path is not non-conductive, it is possible to prevent the charge accumulated in the capacitor C1 from unintentionally leaking to the conductive path.
  • FIG. 6 is a diagram illustrating a circuit configuration of a third modification of the variable capacitance circuit shown in FIG.
  • the variable capacitance circuit 100C according to the third modification includes a switch control circuit 110B instead of the switch control circuit 110A, as compared with the variable capacitance circuit 100A shown in FIG.
  • the switch control circuit 110B further includes an AND circuit 111 as compared with the switch control circuit 100A.
  • the control voltage Vg1 and the control voltage Vg2 are input to the AND circuit 111, and the control voltage Vg3 (third control voltage) is output and supplied to the gates of the transistors Tr1 and Tr2.
  • the control voltage Vg3 is a voltage that is at a high level when both the control voltage Vg1 and the control voltage Vg2 are at a high level, and that is at a low level when at least one of the control voltage Vg1 and the control voltage Vg2 is at a low level. is there. Therefore, in this modification, the transistor Tr1 and the transistor Tr2 operate synchronously.
  • variable capacitance circuits 100, 100A to 100C are applied to the resonance capacitor 42 of the power reception side resonance circuit. Then, the capacitance value of the resonance capacitor 42 is controlled so that the frequency of the signal received by the power receiving device 3 is equal to the resonance frequency of the power receiving resonance circuit. Thereby, the degree of resonance of the power reception side resonance circuit is strengthened, and the power transmission efficiency is improved.
  • various control methods for the capacitance value of the resonant capacitor 42 that is, various control methods for the reference voltage Vref
  • FIG. 7 is a block diagram showing a control system for controlling the capacitance value of the resonant capacitor 42.
  • the control system 200 shown in FIG. 7 has a function of increasing the degree of resonance of the power receiving side resonance circuit by controlling the capacitance value of the resonance capacitor 42.
  • the control system 200 includes a resonance circuit 210, a voltage / current detector 220, a reference voltage generation circuit 230, a switch control circuit 240, and a switching circuit 250.
  • the control voltages Vg1 and Vg2 are generated using the method A will be described as an example, but the present configuration can also be applied to the case where the control voltage is generated using the method B.
  • the resonance circuit 210 is a circuit corresponding to the power reception side resonance circuit, and includes the power reception coil 41 and the resonance capacitor 42 shown in FIG.
  • the voltage / current detector 220 detects a voltage Vr corresponding to the voltage applied to the resonance circuit 210 and a current Ir corresponding to the current flowing through the resonance circuit 210.
  • the voltage / current detector 220 may be configured by one detector, or may include each detector of voltage and current.
  • a combined voltage of the power receiving coil 41 and the resonance capacitor 42 (that is, a voltage obtained by subtracting an induced voltage of the power receiving coil 41 from a voltage applied to both ends of the power receiving unit 40) is set as the voltage Vr.
  • the current that flows through may be the current Ir.
  • the voltage applied to both ends of the power receiving coil 41 includes the impedance characteristics of the power receiving coil 41 measured in advance and the current flowing through the power receiving coil 41 (that is, the current flowing through the power receiving unit 40).
  • the voltage / current detector 220 only has to detect the voltage applied to both ends of the resonance capacitor 42 and the current flowing through the power receiving unit 40, and the above-described combined voltage can be derived therefrom.
  • the voltage / current detector 220 detects the voltage applied to both ends of the power supply circuit 10 and the current output from the power supply circuit 10 in the power transmission device 2 shown in FIG. Also good. In this case, the voltage and current values detected by the voltage / current detector 220 may be transmitted from the power transmission device 2 to the power reception device 3 via a wired or wireless network.
  • the reference voltage generation circuit 230 controls the duty ratio as an intermediate variable based on the phase difference ⁇ between the voltage Vr and the current Ir detected by the voltage / current detector 220, and generates the reference voltage Vref according to the duty ratio.
  • the resonance degree of the resonance circuit is generally stronger as the phase difference between the voltage and current of the resonance circuit is smaller. Therefore, the reference voltage generation circuit 230 controls the duty ratio so that the phase difference ⁇ between the voltage Vr and the current Ir becomes small (for example, minimized).
  • the switch control circuit 240 is a circuit corresponding to the switch control circuit 110 shown in FIG. That is, the switch control circuit 240 generates the control voltages Vg1 and Vg2 by comparing the reference voltage Vref supplied from the reference voltage generation circuit 230 with the voltage V2 and the voltage ⁇ V2 supplied from the resonance circuit 210, respectively. .
  • the switching circuit 250 is a circuit corresponding to the transistors Tr1 and Tr2 shown in FIG. That is, in the switching circuit 250, the transistors Tr1 and Tr2 are repeatedly switched on and off in accordance with the control voltages Vg1 and Vg2 supplied from the switch control circuit 240. Thereby, the capacitance value of the resonant capacitor 42 is continuously adjusted according to the duty ratio D calculated in the reference voltage generation circuit 230.
  • the resonance frequency of the power receiving side resonance circuit is continuously adjusted by controlling the capacitance value of the resonance capacitor 42 according to the frequency of the signal received by the power receiving device 3. Can do. Therefore, even when a deviation occurs between the frequency of the transmission signal transmitted from the power transmission device 2 and the resonance frequency of the power receiving resonance circuit, the deviation of these frequencies can be compensated with high accuracy. , Power transmission efficiency can be improved. Further, since the capacitance value can be adjusted with a small circuit configuration as compared with a configuration using a mechanical variable capacitor, for example, an increase in size of the circuit can be suppressed.
  • FIG. 8 is a diagram illustrating the overall configuration of the non-contact power feeding system according to the second embodiment of the present invention.
  • the non-contact power feeding system 1a illustrated in FIG. 8 further includes a first detector 30, a second detector 70, and a reference voltage generation circuit 4 as compared with the non-contact power feeding system 1 illustrated in FIG. .
  • the first detector 30 is provided between the power supply circuit 10 and the power transmission unit 20 in the power transmission device 2, and detects the power Pin (first power) supplied from the power supply circuit 10 to the power transmission unit 20.
  • the first detector 30 may be included in the power transmission device 2 or may be provided outside the power transmission device 2.
  • the second detector 70 is provided between the rectifying and smoothing circuit 50 and the load 60 in the power receiving device 3, and detects the power Pout (second power) corresponding to the power received by the power receiving device 3.
  • the second detector 70 may be included in the power receiving device 3 or may be provided outside the power receiving device 3.
  • the reference voltage generation circuit 4 generates a reference voltage Vref for controlling the capacitance value of the resonant capacitor 42 based on the power Pin detected by the first detector 30 and the power Pout detected by the second detector 70. Generate. Specifically, the reference voltage generation circuit 4 controls the duty ratio so that the power Pout (Pout / Pin) with respect to the power Pin becomes large based on, for example, the ratio between the power Pin and the power Pout, and according to the duty ratio A reference voltage Vref is generated. Thereby, the received power with respect to the signal transmitted increases and the transmission efficiency of the non-contact electric power feeding system 1a improves.
  • the reference voltage generation circuit 4 may control the duty ratio based on the power Pout so that the power Pout becomes equal to or higher than a predetermined level. This also increases the received power and improves the transmission efficiency of the non-contact power feeding system 1a.
  • the first detector 30 and the second detector 70 and the reference voltage generation circuit 4 may be connected so that they can communicate with each other via, for example, a wired or wireless network.
  • FIG. 9 is a diagram illustrating the overall configuration of the non-contact power feeding system according to the third embodiment of the present invention.
  • the resonance capacitor 23 included in the power transmission unit 20 is configured by a variable capacitance circuit, similarly to the resonance capacitor 42 included in the power reception unit 40.
  • the resonance frequency of the resonance circuit included in the power transmission unit 20 (hereinafter also referred to as “power transmission side resonance circuit”) can be adjusted.
  • the reference voltage generation circuit 4 generates and outputs a reference voltage Vref1 for controlling the capacitance value of the resonance capacitor 23 and a reference voltage Vref2 for controlling the capacitance value of the resonance capacitor 42.
  • the capacitance value of the resonance capacitor 23 is controlled so that, for example, the resonance frequency of the power transmission side resonance circuit is equal to the frequency of the AC power supply voltage output from the power supply circuit 10. Thereby, the transmission power with respect to the said AC power supply voltage increases.
  • the variable capacitor circuits 100 and 100A to 100C described above can be applied to the configuration of the resonant capacitor 23, and thus detailed description thereof is omitted.
  • the method for controlling the capacitance value of the resonant capacitor 23 (that is, the method for controlling the reference voltage Vref1) is not particularly limited.
  • the power received by the power receiving device 3 during the transmission of power from the power transmitting device 2 to the power receiving device 3 is used.
  • the reference voltage generation circuit 4 controls the duty ratio based on the power Pout detected by the second detector 70 so that the power Pout becomes a predetermined level or more, and the reference voltage is determined according to the duty ratio.
  • the voltage Vref1 may be generated.
  • the resonance frequency of the power transmission side resonance circuit can be adjusted according to the frequency. Therefore, according to the non-contact power feeding system 1b, the transmission power can be increased in addition to the improvement of the power transmission efficiency.
  • the resonance capacitor 42 may be configured by a capacitor having a fixed capacitance value. Further, the above-described method for controlling the capacitance value of the variable capacitance circuit may be used in combination with each other.
  • the duty ratio is determined by the ratio of the reference voltage Vref to the amplitude value of the voltage V2 applied across the capacitor C2.
  • the amplitude value of the voltage V2 can vary depending on, for example, the magnitude of the power transmitted from the power transmission device 2 and the capacitance value of the capacitor C1. Based on this point, a method of generating the reference voltage Vref that can keep the duty ratio constant even when the amplitude value of the voltage V2 varies will be described below.
  • FIG. 10 is a diagram illustrating a circuit configuration of a reference voltage adjusting circuit that adjusts the reference voltage so as to maintain a designated duty ratio in the non-contact power feeding system according to the first embodiment of the present invention.
  • the reference voltage Vref and the inverted reference voltage ⁇ Vref are generated based on the method B will be described as an example.
  • the present configuration is also applied to the case where the reference voltage Vref is generated based on the method A. Is possible.
  • the reference voltage adjusting circuit 300 is included in, for example, the reference voltage generating circuit 230 shown in FIG. 7 and the reference voltage generating circuit 4 shown in FIGS.
  • the reference voltage adjustment circuit 300 generates a reference voltage so as to realize the duty ratio calculated in the reference voltage generation circuits 230 and 4.
  • the reference voltage adjustment circuit 300 includes a rectifier circuit 310, a voltage dividing circuit 320, and a differential amplifier circuit 330.
  • the rectifier circuit 310 includes a set of diodes D1 and D2 and a set of diodes D3 and D4 connected in series with each other, and a capacitor connected in parallel with the set of diodes D1 and D2 and the set of diodes D3 and D4. C3.
  • the rectifier circuit 310 rectifies the voltage V2 that is alternating current and outputs it as direct current.
  • the voltage dividing circuit 320 includes a variable resistance element R1 and a variable resistance element R2 connected in series with each other.
  • the voltage dividing circuit 320 divides the voltage rectified by the rectifying circuit 310 at a predetermined ratio, and outputs a voltage V3 divided from the connection point between the variable resistance element R1 and the variable resistance element R2.
  • the ratio of the reference voltage Vref to the amplitude value of the voltage V2 can be adjusted by appropriately designing the resistance values of the variable resistance elements R1 and R2. Therefore, the above-described duty ratio can be kept at a designated level.
  • the differential amplifier circuit 330 differentially amplifies the voltage V3 divided by the voltage divider circuit 320 and the ground potential, and outputs a reference voltage Vref and an inverted reference voltage -Vref. Since a general differential amplifier circuit can be used for the differential amplifier circuit 330, detailed description thereof is omitted.
  • the reference voltage adjustment circuit 300 generates the reference voltage Vref and the inverted reference voltage ⁇ Vref that are proportional to the amplitude value of the voltage V2 applied across the capacitor C2.
  • the reference voltage Vref and the inversion reference The voltage ⁇ Vref also varies depending on the amplitude value of the voltage V2. Therefore, for example, the duty ratio can be kept constant without using a complicated circuit, compared to a configuration in which the reference voltage is redesignated in accordance with the fluctuation of the amplitude value of the voltage V2.
  • the voltage V2 applied across the capacitor C2 may be detected by, for example, a differential amplifier circuit, and the voltage output from the differential amplifier circuit may be supplied to the reference voltage adjustment circuit 300.
  • Said non-contact electric power feeding system 1, 1a, 1b can be used for the electric power feeding to the automatic guided vehicle (AGV: Automatic Guided Vehicle) which runs automatically in a factory, an electric vehicle etc., for example.
  • AGV Automatic Guided Vehicle
  • the non-contact power feeding system 1, 1a, 1b when one power receiving device receives power from a plurality of power transmitting devices, each transmission is transmitted even if the frequencies of transmission signals transmitted from the power transmitting devices are different. By adjusting the resonance frequency of the power receiving unit 40 according to the signal frequency, power can be received with high transmission efficiency.
  • the non-contact power supply system 1, 1a, 1b can be used for power supply to a wearable device such as a seal type pulse sensor or a myoelectric sensor on the textile side.
  • a wearable device such as a seal type pulse sensor or a myoelectric sensor on the textile side.
  • the power receiving device 3 it is necessary to make the entire circuit flexible.
  • the power receiving coil 41 is made flexible, the inductance value varies according to the deformation of the power receiving coil 41, and as a result, the resonance frequency of the power receiving unit 40 may vary.
  • the resonance frequency of the power reception unit 40 is set to the transmission signal by adjusting the capacitance value of the resonance capacitor 42 so as to compensate for the variation in the inductance value of the power reception coil 41.
  • the frequency can be adjusted. Therefore, power can be received with high transmission efficiency.
  • the power transmission unit 20 and the power reception unit 40 are both configured by a series resonance circuit.
  • the present invention is not limited to this, and the power transmission unit 20 and the power reception unit 40 are configured. Either one or both of them may be constituted by a parallel resonant circuit. Also in this case, the resonance frequency of the parallel resonance circuit can be adjusted by applying the variable capacitance circuit to the resonance capacitor.
  • an impedance matching circuit may be further provided between the power supply circuit 10 and the power transmission unit 20 in the power transmission device 2 or between the power reception unit 40 and the load 60 in the power reception device 3. .
  • the capacitance value can be adjusted according to the frequency of the signal, thereby improving the transmission power and transmission efficiency.
  • SYMBOLS 1 Non-contact electric power feeding system, 2 ... Power transmission apparatus, 3 ... Power reception apparatus, 4 ... Reference voltage generation circuit, 10 ... Power supply circuit, 20 ... Power transmission unit, 30 ... 1st detector, 40 ... Power reception unit, 50 ... Rectification smoothing Circuit, 60 ... Load, 70 ... Second detector, 21 ... Power transmission coil, 22,23 ... Resonance capacitor, 41 ... Receiving coil, 42 ... Resonance capacitor, 100, 100A to 100C ... Variable capacitance circuit, 110, 110A, 110B DESCRIPTION OF SYMBOLS Switch control circuit 111 ... AND circuit 200 ... Control system 210 ... Resonance circuit 220 ...
  • Voltage current detector 230 ... Reference voltage generation circuit 240 ; Switch control circuit 250 ... Switching circuit 300 . Reference voltage adjustment Circuit 310 rectifier circuit 320 voltage divider circuit 330 differential amplifier circuit C1 to C3 capacitor capacitor Tr1 to Tr4 transistor P1 ⁇ OP4 ... comparators, D1 ⁇ D4 ... diodes, R1, R2 ... variable resistance element

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Cette invention concerne un appareil de réception d'énergie, un dispositif vestimentaire et un système d'alimentation électrique sans contact qui sont capables d'améliorer l'efficacité de transmission tout en limitant une augmentation de la taille des circuits et qui peuvent améliorer l'efficacité de transmission. Cet appareil de réception d'énergie (3) est pourvu d'un circuit à capacité variable (100) et d'une bobine de réception d'énergie (41) qui constitue un circuit résonnant avec le circuit à capacité variable (100) conjointement avec un circuit résonnant. Le circuit à capacité variable (100) comprend : un premier condensateur (C1) et un second condensateur (C2) connectés en parallèle l'un à l'autre ; un premier interrupteur (Tr1) connecté en série à un premier côté d'extrémité du premier condensateur (C1) ; et un circuit de commande d'interrupteur (110) qui commande la mise à l'état passant/non passant du premier interrupteur (Tr1) et comprend un premier comparateur (OP1) pour appliquer une première tension de commande au premier interrupteur (Tr1) en fonction du résultat d'un résultat de comparaison entre une tension de référence et une tension alternative appliquée au second condensateur (C2).
PCT/JP2019/009057 2018-03-08 2019-03-07 Appareil de réception d'énergie, dispositif vestimentaire et système d'alimentation électrique sans contact WO2019172366A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/978,547 US11101699B2 (en) 2018-03-08 2019-03-07 Power reception device, wearable device, and non-contact power feeding system

Applications Claiming Priority (4)

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JP2018041691 2018-03-08
JP2018-041691 2018-03-08
JP2018-228149 2018-12-05
JP2018228149A JP7201414B2 (ja) 2018-03-08 2018-12-05 受電装置、ウェアラブルデバイス、及び非接触給電システム

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Citations (8)

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Publication number Priority date Publication date Assignee Title
JP2004072832A (ja) * 2002-08-02 2004-03-04 Hitachi Kiden Kogyo Ltd 非接触給電方法
JP2007501600A (ja) * 2003-05-23 2007-01-25 オークランド ユニサービシズ リミテッド 誘導結合電力伝達システムを制御する方法および装置
JP2012055157A (ja) * 2010-09-02 2012-03-15 Advantest Corp ワイヤレス受電装置、ワイヤレス給電装置およびワイヤレス給電システム
JP2012182980A (ja) * 2011-03-01 2012-09-20 Tdk Corp ワイヤレス受電装置、ワイヤレス電力伝送システムおよび電力制御装置
JP2013070590A (ja) * 2011-09-21 2013-04-18 Pioneer Electronic Corp 非接触電力送電装置、非接触電力受電装置、及び非接触給電システム
JP2013243882A (ja) * 2012-05-22 2013-12-05 Toyota Motor Corp 送電装置、受電装置、車両、および非接触給電システム
JP2014143776A (ja) * 2013-01-22 2014-08-07 Mitsubishi Electric Corp ワイヤレス受電装置、ワイヤレス送電装置、およびワイヤレス給電装置
JP2015204708A (ja) * 2014-04-15 2015-11-16 株式会社Ｎｔｔドコモ 端末装置及び送電制御方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004072832A (ja) * 2002-08-02 2004-03-04 Hitachi Kiden Kogyo Ltd 非接触給電方法
JP2007501600A (ja) * 2003-05-23 2007-01-25 オークランド ユニサービシズ リミテッド 誘導結合電力伝達システムを制御する方法および装置
JP2012055157A (ja) * 2010-09-02 2012-03-15 Advantest Corp ワイヤレス受電装置、ワイヤレス給電装置およびワイヤレス給電システム
JP2012182980A (ja) * 2011-03-01 2012-09-20 Tdk Corp ワイヤレス受電装置、ワイヤレス電力伝送システムおよび電力制御装置
JP2013070590A (ja) * 2011-09-21 2013-04-18 Pioneer Electronic Corp 非接触電力送電装置、非接触電力受電装置、及び非接触給電システム
JP2013243882A (ja) * 2012-05-22 2013-12-05 Toyota Motor Corp 送電装置、受電装置、車両、および非接触給電システム
JP2014143776A (ja) * 2013-01-22 2014-08-07 Mitsubishi Electric Corp ワイヤレス受電装置、ワイヤレス送電装置、およびワイヤレス給電装置
JP2015204708A (ja) * 2014-04-15 2015-11-16 株式会社Ｎｔｔドコモ 端末装置及び送電制御方法

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