KR101455695B1 - Method of System Wake-Up for Wireless Power Transfer Apparatus - Google Patents

Abstract

The present invention provides a wake-up means in a wireless power transmitter or receiver for transmitting and receiving power in a wireless manner, such as a magnetic induction system, and transmits a wake-up notification to a transmitter by a user, A system wake-up method for a wireless power transmission system capable of eliminating power loss, shortening the charge recognition time by eliminating the search process, and ensuring the reliability of wireless charging even when the receiver battery is fully discharged through wake-up means .

Description

TECHNICAL FIELD [0001] The present invention relates to a system wake-up method for a wireless power transmission system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission system, and more particularly, to a wake-up method that includes a wake-up means in a wireless power transmitter or receiver for a wireless power transmission system so that it can only operate according to the needs of the user.

Generally, in a wireless power transmission system, a transmitter sends a wake-up signal, waits for a response from a receiver, and transmits a response message (a receiver identifier (ID)) from a receiver before transmitting power in a wireless manner, ), The wireless power is supplied to the power supply target receiver. Related arts are Korean Patent Laid-open Nos. 10-2011-0110987, 10-2012-0071626, 10-2012-0090220, and U.S. Patent Publication Nos. 20120068550 and 20120049861.

However, in such a conventional wireless power transmission system, there is a power loss due to the process of searching in the transmitter in order to wake up the receiver as described above. Conventionally, in order to wake up the receiver, the transmitter first supplies the initial power to the receiver to operate the search process for requesting the ID, prior to power supply for charging or supply to the load. Therefore, There is a problem that the transmitter wastes power by periodically supplying initial power. In this method, a transmitter needs a complicated algorithm to electronically detect a receiver. Even if a receiver is present, recognition time of several seconds to several tens of seconds is required to recognize the ID, so that the receiver can charge the battery or supply power to the load There is a problem in that the time for the data is delayed. In addition, when the receiver operates using the battery, it is difficult to transmit the ID in the fully discharged state of the battery. Therefore, the conventional method of supplying power through the ID recognition of the receiver as described above is difficult to wirelessly charge.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and it is an object of the present invention to provide a wake-up means in a wireless power transmitter or receiver for transmitting and receiving power in a wireless manner, To the transmitter so as to eliminate the initial power loss due to the periodic search process of the receiver at the transmitter, to shorten the charge recognition time by eliminating the search process, And to provide a system wake-up method for a wireless power transmission system capable of ensuring reliability.

The present invention relates to a method and apparatus for transmitting power from a transmitter coil mounted on a power module of a transmitter to a receiver coil mounted on a power module of a receiver, A wireless power transmission method for powering a load of a receiver, the method comprising: transmitting a wireless power from the transmitter to a corresponding target receiver without periodically searching the wireless power transmission target receiver for a long period of time; When the wake-up signal is generated in the wake-up means driven by the wake-up means, the information transmitted by the communication module after being waked up by the initial communication signal transmitted by the communication module receiving the wake- The communication module of the receiver receiving the up signal is immediately woken up and then transmitted Depending on the beam, and in the transmitter characterized in that comprises the transmission of the wireless power to the receiver.

According to another aspect of the present invention, there is provided a wireless power transmission system including: a transmitter including a first communication module and a first power module equipped with a transmission coil for transmission of wireless power; And a second power module having a second communication module and a receiving coil for receiving radio power from the transmitting coil, wherein when a wake-up signal is generated at the wake-up means driven by the user, Wherein the first communication module receives the wake-up signal and transmits information after the second communication module wakes up according to an initial communication signal transmitted from the first communication module, or the second communication module receiving the wake- And transmitting the radio power from the transmitter to the receiver in accordance with information to be transmitted after the transmitter transmits the radio power to the target receiver without searching the receiver for the radio power transmission. .

Wherein the first power module transmits initial wireless power as the initial communication signal under the control of the first communication module and the second power module receives the initial wireless power, This is possible.

The communication module of the receiver is woken up by the initial wireless power transmitted by the power module of the transmitter to the power module of the receiver in accordance with the control of the communication module receiving the wake up signal generated at the transmitter at the transmitter The transmission of the wireless power from the transmitter to the receiver is performed according to information to be transmitted after the wake-up signal is received, or information to be transmitted after the communication module of the receiver which receives the wake- .

According to another aspect of the present invention, there is provided a wireless power transmission system including: a transmitter including a first communication module and a first power module equipped with a transmission coil for transmission of wireless power; And a second power module having a second communication module and a receiving coil for receiving radio power from the transmitting coil, wherein when a wake-up signal is generated at the wake-up means driven by the user, Wherein the first communication module receives the wake-up signal generated by the wake-up means and controls the first communication module to transmit the wake-up signal to the second power module, The transmission of the wireless power from the transmitter to the receiver is performed according to information to be transmitted after the first communication module receives the wake-up signal generated by the wake-up means, So that the transmitter transmits wireless power to the target receiver without searching the receiver for the wireless power transmission target. And the like.

And the transmitter is forcibly controlling the transmission power according to the response of the information in the receiver to forcibly transmit the wireless power to the receiver by using the occurrence of the wake-up signal forced by the user's operation .

The wake-up means may include a switch or an electric button-type switch that can be electrically turned on or off in the transmitter or the receiver, and may be connected to the corresponding communication module by wire.

The switch or the device in the form of a button may consist of a plurality of two or more devices and may be arranged at different positions.

The switch or button-shaped device may be installed on the outer surface of the transmitter or the receiver.

The switch or the button-shaped device may be embedded in the housing groove of the transmitter or the receiver and may be installed so as to protrude from the housing plane according to the user's manipulation.

Alternatively, the wake-up means may be connected to the corresponding communication module wirelessly by a short-range wireless communication method from outside the transmitter or the receiver.

Alternatively, the wake-up means includes a button on the touch screen driven on the touch screen according to an application executed in the transmitter or the receiver, and when the button is touched by the user, And generate the wake-up signal.

According to the system wake-up method for a wireless power transmission system according to the present invention, it is possible to prevent an initial power wastage due to a periodic search process of a receiver in a transmitter, shorten the initial receiver recognition time, The power can be supplied quickly.

In addition, the control algorithm for initial receiver recognition is simplified, and even when the receiver's battery is completely discharged and the receiver can not be operated, power can be forcibly supplied through the wake-up means, thereby ensuring the reliability of wireless charging .

1 is a diagram illustrating a wireless power transmission system having a wake-up means according to an embodiment of the present invention at a transmitter side.
2 is a detailed block diagram of the transmitter and receiver of FIG.
3 is a diagram illustrating a wireless power transmission system having a wake-up means according to an embodiment of the present invention at a receiver side.
4 is a detailed block diagram of the transmitter and receiver of FIG.
5 is a flowchart illustrating a power transmission method between the transmitter and the receiver of FIG.
FIG. 6 is a flowchart illustrating a power transmission method between the transmitter and the receiver of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

1 is a diagram illustrating a wireless power transmission system 100 having a wake-up means according to an embodiment of the present invention at a transmitter side.

1, a wireless power transmission system 100 according to an embodiment of the present invention includes a transmitter 110 for transmitting wireless power, a wake-up means (or a device) 111 provided in the transmitter 110, And a receiver 120 for receiving wireless power transmitted by the transmitter 110. [

The transmitter 110 is a device capable of receiving power from a power outlet such as a home or an office and transmitting power wirelessly through a transmission (resonance) coil. The receiver 120 is installed in various electronic devices such as a cellular phone, Or may be in an independent form. For example, as shown in FIG. 1, one or more electronic devices such as a cellular phone, an iPad, and the like having a receiver 120 are placed on or placed around a padded transmitter 110, , And the receiver 120 may charge the battery or power the circuitry of the electronic device.

2 is a detailed block diagram of the transmitter 110 and the receiver 120 of FIG. As shown in FIG. 2, the transmitter 110 includes a communication module 112 in addition to the wake-up means (or device) 111 and a power module 113 equipped with a transmission (resonance) coil for transmission of radio power. The receiver 120 includes a communication module 122 and a power module 123 with a receiving (resonant) coil for receiving radio power from the transmitting coil of the power module 113. The receiver 120 may receive and transmit the wireless power transmitted by the transmitter 110 to a load, i.e., a battery or a circuit of the electronic device to charge the battery or operate the circuit of the electronic device.

The wake-up means (or apparatus) of the present invention may be provided on the transmitter side as described above, but may also be provided on the receiver side as shown in FIG.

3 is a diagram illustrating a wireless power transmission system 200 having a wake-up means according to an embodiment of the present invention at the receiver side.

3, the wireless power transmission system 200 of the present invention includes a transmitter 210 for transmitting wireless power, a receiver 220 for receiving power transmitted from the transmitter 210, and a receiver 220 And a wake-up means (or device)

Similarly, the transmitter 210 is a device capable of receiving power from a power outlet of a home, an office, or the like and transmitting power wirelessly through a transmission (resonance) coil. The receiver 220 is a device, Or may be in an independent form. For example, as shown in FIG. 3, the transmitter 210 may include at least one electronic device such as a cellular phone, an iPad, or the like having the receiver 220 mounted on or placed on the plate- And the receiver 220 may charge the battery or power the circuitry of the electronic device.

4 is a detailed block diagram of the transmitter 210 and the receiver 220 of FIG.

As shown in FIG. 4, the transmitter 210 includes a communication module 212 and a power module 213 equipped with a transmission (resonance) coil for transmission of radio power. The receiver 120 includes a power module 223 with a receiving (resonant) coil for receiving wireless power from the transmitting coil of the communication module 222 and the power module 213, in addition to the wake up means ). The receiver 220 may receive and transmit the wireless power transmitted by the transmitter 210 to a load, i. E., A battery or circuitry of the electronic device, to charge the battery or operate the circuitry of the electronic device.

In the present invention, the wake-up means (or apparatus) 111/221 may be provided in the transmitter 110 or the receiver 220 as shown in Fig. 2 or Fig. 4, When the wake-up means (or device) 111/221 generates a corresponding wake-up signal, the transmitter 110/210 is driven by the receiver 120/220 (Rx Information) at the receiver 120/220, so that the wireless power can be forcibly transmitted to the receiver 120/220.

That is, in the present invention, even if the wake-up means (or device) 111/221 driven by the user does not detect the wireless power transmission target receiver 120/220 by the transmitter 110/210, The transmitter 110/210 can immediately adjust the transmit power to transmit the wireless power to the receiver 120/220.

For example, in the case of FIG. 2, when the user drives the wake-up means (or apparatus) 111 to cause the wake-up means (or apparatus) 111 to generate a wake-up signal (see S110 in FIG. 5) The communication module 112 of the transmitter 110 receiving the corresponding wake up signal of the wake up means 111 may generate an initial communication signal or may cause the power module 113 to generate initial wireless power And the initial communication signal or initial power generated at this time is transmitted to the communication module 122 or the power module 123 of the receiver 120 (refer to S111 in FIG. 5). The initial wireless power transmitted at the transmit coil of the transmitter 110 power module 113 may be transmitted to the receive coil of the power module 123 of the receiver 120 that is resonated by an electromagnetic induction or magnetic field coupling scheme.

The initial communication signal generated by the communication module 112 of the transmitter 110 may wake up the communication module 122 of the receiver 120 or may receive initial power from the power module 113 The power module 123 of the receiver 120 may wake up the communication module 122 to operate the communication module 122 using the corresponding power (refer to S120 in FIG. 5). The wake-up communication module 122 may transmit the response information (Rx Information) to the transmitter 110 (see S130 in Fig. 5). Such response information (Rx Information) includes information such as an identifier (e.g., a receiver unique number) for identifying a target receiver in a transmitter 110, power consumption information of a receiver, Various information to be referred to may be included.

The communication module 112 of the transmitter 110 receiving the response information Rx information can transmit a predetermined response message to the receiver 120 (refer to S140 in FIG. 5) (See S141 in FIG. 5) and transmit the wireless power to the receiver 120 with the adjusted transmission power level by identifying the receiver 120 and adjusting the required transmission power to the receiver 120 (See S142 of FIG.

2, the transmission of the radio power from the transmitter 110 to the receiver 120 is performed according to the wake-up signal generated by the wake-up means (or device) 111 driven by the user, The transmitter 110 can transmit the wireless power to the target receiver without searching the receiver 110 for the wireless power transmission target receiver.

4, when the user drives the wake-up means (or device) 221 and the wake-up means (or apparatus) 221 generates a wake-up signal (see S210 in Fig. 6) , The communication module 222 of the receiver 220 receiving the corresponding wake up signal of the wake up means (or device) 221 wakes up and the wakeup communication module 222 sends the response information (Rx Information) (refer to S220 in FIG. 6). Such response information (Rx Information) includes information such as an identifier (e.g., a receiver unique number) for identifying a target receiver in the transmitter 210, power consumption information of the receiver, Various information to be referred to may be included.

The communication module 212 of the transmitter 210 receiving the response information Rx information can transmit a predetermined response message to the receiver 220 (refer to S230 in FIG. 6) (See S231 of FIG. 6) and transmit the wireless power to the receiver 220 with the adjusted transmission power magnitude by identifying the receiver 220 and adjusting the required transmission power to the receiver 220 (See S232 of FIG.

4, the transmission of the wireless power from the transmitter 210 to the receiver 120 is performed according to the wake-up signal generated by the wake-up means (or device) 221 driven by the user, The transmitter 210 can transmit the wireless power to the target receiver without searching the receiver 210 for the wireless power transmission target receiver.

As described above, the wakeup means (or device) 111/221 may be included in the transmitter 110 or the receiver 220 and may be located inside or outside the transmitter 110 or the receiver 220, Or may be installed on the surface of the transmitter 110 or the receiver 220. In addition, the transmitter 110 may be mounted on the surface of the receiver 220, or may be mounted on the surface of the receiver 220. [

For example, the wake-up means (or device) 111/221 may be a switch or an apparatus in the form of a button that can be turned on and off electrically in the transmitter 110 or receiver 220 And may be installed in a form of wired connection with the corresponding communication module 112/222. A switch or a button-shaped device for such a wake-up means (or device) 111/221 may consist of a plurality of two or more and may be arranged at different positions.

A switch or a button-shaped device for such a wake-up device (or device) 111/221 may also be provided so as to protrude from the outer surface of the transmitter 110 or the receiver 220, May be installed in a predetermined groove formed in a housing which is an enclosure for protecting and enclosing the internal circuit of the receiver 220 and may be installed so as to protrude and press on the housing plane according to the user's operation.

Alternatively, for example, the wake-up means (or device) 111/221 may be a wired-up wireless communication system (e.g., ZigBee, Bluetooth, Near Field Communication Or a radio frequency (RF) signal for a short distance) to the corresponding communication module 112/222. At this time, the communication module 112/222 may be provided with a module for short range wireless communication.

In addition, for example, the wake-up means (or device) 111/221 may be a wake-up means (or a device) 111/221 which, in response to a predetermined application being loaded and executed in the memory of the transmitter 110 or receiver 220, Lt; / RTI > As the user touches a button on the touch screen, the transmitter 110 or the processor of the receiver 220 may generate the above-described wake-up signal.

As described above, in the present invention, the transmission of the forced radio power is performed using the wakeup means (or the device) 111/221, thereby preventing the initial power wastage due to the periodic search process of the receiver in the transmitter Shortening the initial receiver recognition time can quickly charge the receiver's battery or power the receiver's load quickly. In addition, the control algorithm for initial receiver recognition is simplified, and power can be forcibly supplied through the wake-up means (or device) 111/221 even when the receiver's battery is completely discharged and the receiver can not be operated The reliability of wireless charging can be guaranteed.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

Claims (9)

A receiver for charging the battery of the receiver or supplying wireless power to the load of the receiver by transmitting wireless power to a receiver coil mounted on a power module of a receiver whose battery is discharged from the transmitter coil mounted on the power module of the transmitter, In a power transmission method,
Transmitting an initial wireless power to the receiver to make the receiver operable when the wake-up means included in the transmitter is driven by the user and a wake-up signal is generated without the transmitter searching for the receiver;
Receiving response information from a communication module of a receiver which receives the initial wireless power; And
Identifying the receiver with reference to the received response information, and transmitting the wireless power to the identified receiver. A transmitter including a wake-up means, a first communication module and a first power module equipped with a transmission coil for transmission of wireless power; And
A receiver including a battery, a second communication module, and a second power module with a receive coil for receiving the wireless power from the transmit coil, the receiver being configured such that the battery is discharged and not operating,
When the wake-up means is driven by a user to generate a wake-up signal, the first power module transmits initial wireless power to the second power module to make the receiver operable,
Wherein the first power module transmits the wireless power to the identified receiver based on response information transmitted from the second communication module so that the wireless power is supplied to the receiver without the transmitter searching for the receiver To the wireless power transmission system. 3. The method of claim 2,
Wherein the first power module transmits the initial wireless power according to the control of the first communication module and the second communication module is capable of waking up by the second power module receiving the initial wireless power. Wireless power transmission system. 3. The method of claim 2,
Wherein the first power module controls the transmission power according to the response information and forcibly transmits the wireless power to the second power module of the receiver. 3. The method of claim 2,
Wherein the wake-up means comprises a switch or button-type device capable of being electrically turned on and off in the transmitter, and is connected to the first communication module by wire. 3. The method of claim 2,
Wherein the wake-up means is connected to the first communication module wirelessly from outside the transmitter in a short-distance wireless communication manner. 3. The method of claim 2,
The wake-up means includes a button on the touch screen driven on the touch screen according to an application executed in the transmitter, and when the button is touched by the user, the wake-up signal is generated by processing by the processor of the transmitter Characterized by a wireless power transmission system. 6. The method of claim 5,
Wherein said switch or button-shaped device is mounted on the outer surface of said transmitter. 6. The method of claim 5,
Wherein the switch or button-shaped device is installed in a groove of a housing of the transmitter, and is installed so as to be able to be pushed over the housing plane according to a user's operation.

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