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WO2009090590A1 - Appareil électrique rechargeable - Google Patents

Appareil électrique rechargeable Download PDF

Info

Publication number
WO2009090590A1
WO2009090590A1 PCT/IB2009/050105 IB2009050105W WO2009090590A1 WO 2009090590 A1 WO2009090590 A1 WO 2009090590A1 IB 2009050105 W IB2009050105 W IB 2009050105W WO 2009090590 A1 WO2009090590 A1 WO 2009090590A1
Authority
WO
WIPO (PCT)
Prior art keywords
appliance
power
accessory
rechargeable
switching element
Prior art date
Application number
PCT/IB2009/050105
Other languages
English (en)
Inventor
Schelte Heeringa
Ole Lomholt
Oedillius J. Bisschop
Original Assignee
Koninklijke Philips Electronics N.V.
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.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2009090590A1 publication Critical patent/WO2009090590A1/fr

Links

Classifications

    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00036—Charger exchanging data with battery
    • 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
    • H02J7/00047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with provisions for charging different types of batteries

Definitions

  • the invention relates to a rechargeable electric appliance, and to a system comprising the rechargeable electric appliance and an accessory appliance.
  • EP 1073544 discloses a method for transmitting data between a small electrical device and a supplementary electrical device which can be connected thereto, and devices configured accordingly.
  • the small electrical device may be a shaver and the supplementary electrical device may be a charging stand for charging a rechargeable battery of the shaver.
  • an adapter powers the charging stand from the mains.
  • Both the shaver and the charging stand have a display to display information related to the functioning of the shaver.
  • the charging stand supplies a current to the shaver and thereby charges the rechargeable battery.
  • a bidirectional data transfer is provided between the shaver and the charging stand by modulating the current, voltage and/or magnetic field supplied from the charging stand to the shaver.
  • a first aspect of the invention provides a rechargeable electric appliance as claimed in claim 1.
  • a second aspect of the invention provides a system comprising such a rechargeable electric appliance and an accessory appliance as claimed in claim 5.
  • Advantageous embodiments are defined in the dependent claims.
  • the rechargeable electric appliance in accordance with the first aspect of the invention may be a shaver, an electrical toothbrush, a mobile phone, a MP3 player, a PDA, or any other handheld electronic apparatus which has a rechargeable battery as the power source.
  • the accessory appliance may be a charger and/or cleaning stand, a docking station or any other appliance which is associated with the rechargeable electric appliance.
  • the accessory appliance may or may not have a power supply, or may or may not have a connector for connecting a power supply.
  • the rechargeable electric appliance comprises a rectifier arranged in series with the rechargeable battery.
  • the rectifier is poled to allow charging of the battery by a power supply.
  • This power supply may be a separate power supply which is or which is not able to also supply power to the accessory appliance.
  • the power supply may be part of the accessory appliance or may supply power to the rechargeable battery via the accessory appliance.
  • the rechargeable electric appliance comprises a switching element in parallel with the rectifier, and a controller. The controller controls the switching element to be non- conductive when the rechargeable battery is being charged and to be conductive when the rechargeable battery has to supply power to the accessory appliance.
  • the rechargeable battery can be charged via the rectifier.
  • the rectifier prevents a short circuit of the battery when a short circuit occurs at an interface between the rechargeable electric appliance and the accessory appliance or the power supply.
  • this rectifier needs to be bridged by activating the switching element in parallel with the rectifier.
  • the switching element may comprise an electronic switch with a main current path connected in parallel with the rectifier or may comprise a series arrangement of the main current path of an electronic switch and an impedance, wherein this series arrangement is connected in parallel with the rectifier.
  • the impedance limits the current supplied by rechargeable battery, especially in short circuit situations at the interface.
  • the rectifier may be a diode.
  • a power supplying arrangement comprises the rectifier with a first switching element or a second switching element, arranged in parallel with the rectifier.
  • the first switching element comprises the series arrangement of a main current path of a first electronic switch and an impedance.
  • the second switching element comprises a main current path of a second electronic switch.
  • the power supplying arrangement transfers data to the power receiving arrangement by temporarily switching the first or the second switching element to its non-conductive state during a power supply phase when the rechargeable battery is supplying power to the accessory appliance.
  • the rechargeable electric appliance modulates the power supply voltage at the interface to transfer data to the accessory appliance.
  • the accessory appliance recovers the data by checking the power supply voltage received.
  • the data may be encoded in many ways, for example, by varying the duration of the off-periods of the switching element, or by providing different sequences of off-periods.
  • the power supplying arrangement comprises both the first and the second switching element.
  • the controller controls the first switching element or the second switching element to be closed when the rechargeable battery has to supply power to the accessory appliance via the interface.
  • the second switching element is non-conductive and the first switching element is conductive when the switching element of the power receiving arrangement is operated to transfer data to the rechargeable electric appliance via the interface.
  • the present invention is further related to a system which comprises the rechargeable electric appliance and an accessory appliance.
  • the system further comprises a power supply.
  • the power supply may be integrated into the accessory appliance.
  • the power supply may be a separate unit which may be connected to the accessory appliance via a connector.
  • the power supply may supply power to the accessory appliance and to the rechargeable electrical appliance via the accessory appliance.
  • the accessory appliance further comprises a display to display information related to the functioning of the rechargeable electric appliance, and a power receiving arrangement for receiving the power from the power supplying arrangement of the rechargeable electric appliance to power the display when the power supply is not supplying power to the accessory appliance.
  • the interface between the rechargeable electric appliance and the accessory appliance, at which the power is transferred from the accessory appliance to the rechargeable electric appliance, or the other way around, may comprise mechanical electrical contacts or may be contact less by means of magnetic coupled windings.
  • the accessory appliance If the accessory appliance is not powered by the power supply, or has no power supply, the power for its display can be supplied by the rechargeable battery of the rechargeable electrical appliance. Consequently, even if the accessory is not powered or does not have a power supply, the user can read the displayed information on the display of the accessory appliance without requiring a separate display on the rechargeable electrical appliance.
  • This has the advantage that the rechargeable electrical appliance can be miniaturized or that identical rechargeable electrical appliances can be differentiated by means of different accessory appliances.
  • the adapter has to be powered to be able to display the information. This is a drawback when the shaver is used on a journey.
  • a separate battery could be provided inside the accessory appliance, but that is not an environmental friendly option.
  • the information displayed on the display of the accessory appliance may be an indication of the amount of charge of the rechargeable battery or any other information about the functioning of the rechargeable electric appliance, such as, for example, shaving system settings if the rechargeable electric appliance is a shaver.
  • the power receiving arrangement comprises a first rectifier which is poled to block a current supply to circuits of the accessory appliance which should not draw power when the accessory appliance receives power from the rechargeable battery.
  • the power drawn from the rechargeable battery is minimal.
  • the diode may block the current to flow towards the inactive power supply of the accessory appliance.
  • the power receiving arrangement comprises a suitably poled second rectifier arranged in series with circuits of the accessory appliance which should be powered when receiving power from the rechargeable battery.
  • This second rectifier which may be a diode, decouples the power using circuits of the accessory appliance from the interface between the rechargeable electric appliance and the accessory appliance. This decoupling is relevant if the power supply voltage at the interface is modulated to transfer data between the rechargeable electric appliance and the accessory appliance.
  • the power receiving arrangement comprises a capacitor arranged across the power using circuits to provide energy to these circuits when the second rectifier is non conductive.
  • the power receiving arrangement comprises a switching element coupled to a terminal of the second rectifier not being coupled to the capacitor for providing data from the power receiving arrangement to the power supplying arrangement.
  • This switch is able to modulate the voltage at the interface between the rechargeable electric appliance and the accessory appliance.
  • the rechargeable electric appliance is a shaver and the accessory appliance is a shaver charging stand and/or a shaver cleaning stand.
  • a shaver charging and cleaning stand, as such, is known from US2006/0277758.
  • Fig. 1 shows a block diagram of an embodiment of a system comprising a power supply, an accessory appliance and a rechargeable electric appliance, and
  • Fig. 2 shows a block diagram of another embodiment of a system comprising a power supply, an accessory appliance and a rechargeable electric appliance.
  • Fig. 1 shows a block diagram of an embodiment of a system comprising a power supply 3, an accessory appliance 2 and a rechargeable electric appliance 1.
  • the accessory appliance 2 is called the charger 2
  • the rechargeable electric appliance 1 is referred to as the shaver.
  • the power supply 3 may be a mains adaptor which converts the mains voltage into a DC voltage VA suitable for supply of power to the charger 2 and to the shaver 1.
  • the mains adapter may be a separate unit which is connected via the interface Il to the charger 2.
  • the interface Il may comprise an electrical connector which has the terminals Tl and T3 at the charger 2.
  • the power supply 3 may be mechanically integrated with the charger 2.
  • the interface Il does not require a connector but may consist of wires or of tracks on a printed circuit board.
  • the power supply 3 should be able to provide sufficient power for the circuits of the charger, the circuits of the shaver, and for charging the rechargeable battery 10 of the shaver.
  • the charger 2 receives the voltage VA supplied by the power supply 3 across a series arrangement of a rectifier D3 and an electronic switch SW3.
  • the rectifier D3 is a diode which is poled such that the power supply 3 is able to supply power to the shaver 1 via the interface 12 and to block the current supplied from the battery 10 of the shaver 1 to the power supply 3.
  • the electronic switch SW3 shown is a FET.
  • the junction of the rectifier D3 and the main current path of the FET SW3 is the terminal T2, and the yet not connected terminal of the main current path of the FET SW3 is the terminal T4.
  • the terminal T4 is electrically connected to the terminal T3.
  • a series arrangement of a diode D2 and a capacitor Cl is arranged in parallel with the FET SW3.
  • the diode D2 is poled to conduct the current supplied by the power supply 3 via the diode D3, or supplied by the battery 10 of the shaver to the display 20 and the controller 22 of the charger 2.
  • the capacitor Cl acts as an energy storage when the diode D2 is non-conductive.
  • the controller 22 receives the voltage VB as its power supply voltage, and senses the voltage VA supplied by the power supply 3 and the voltage VC at the interface 12.
  • the controller 22 supplies a switch signal DS3 to the FET SW3 and a display signal DI to the display 20.
  • the controller 22 may comprise a microprocessor and an analog to digital converter which converts the sensed voltages VA and VC to digital signals suitable to be processed by the microprocessor.
  • the voltage VC may be modulated by the shaver 1 with data to be sent from the shaver 1 to the charger 2.
  • the controller 22 detects these modulations and is able to recover the data sent by the shaver 1. This data may indicate the charge status of the battery or any other functional issues of the shaver 1, such as for example user selected preferences.
  • the data detected by the controller 22 may be forwarded as the display signal DI for display on the display 20.
  • the controller 22 may sense the voltage VA received from the power supply 3 to detect whether the power supply is connected or active. This detection may be used to indicate, for example with a light source, that the charger 2 is powered.
  • the controller 22 has an output to supply the drive signal DS3 for activating the switch SW3 to short-circuit the terminals T2 and T4 for providing data to the shaver 1. It is not essential the terminals T2 and T4 are short circuited, any modulation of the voltage at or the current through the interface 12 may be implemented to transfer data to the shaver 1. This data may indicate when the shaver 1 has to be cleansed, should still dry, should be filled with a liquid, or may provide handshaking to acknowledge correct receipt of data sent by the shaver 1.
  • the shaver 1 comprises a series arrangement of a diode Dl, a rechargeable battery 10 and a resistor R2, which series arrangement is arranged between the terminals T5 and T6 to receive the power from the power supply 3 via the diode D3 of the charger 2.
  • the diode Dl is poled to enable the power from the power supply 3 to be supplied to the circuits and the battery 10 of the shaver 1.
  • the resistor R2 has a small value and the voltage across it is an indication of the current through the battery.
  • An electronic switch SW2 has a main current path which is connected in parallel with the diode Dl to enable a current flow from the battery 10 towards the charger 2 when the electronic switch SW2 is conductive.
  • a switching element SWl comprises a series arrangement of an impedance Rl and a main current path of an electronic switch Ml . The series arrangement is connected in parallel with the diode Dl.
  • the electronic switch Ml may be dimensioned to have a sufficient high impedance such that the impedance Rl is the internal resistance of the electronic switch Ml.
  • both electronic switches SW2 and Ml are FET's and the impedance Rl is a resistor.
  • the impedance Rl is a resistor.
  • the diode Dl may be the body diode of the FET.
  • the shaver 1 further comprises a controller 12 which receives its power at the input VCC from the battery 10 or from the charger 2 via the diode Dl .
  • the controller 12 has further inputs to sense the voltage VC at the interface, the voltage BV of the battery 10 and the voltage BI at the resistor R2 as a measure of the current through the battery 10.
  • the controller has outputs to supply the drive signals DS2 and DSl to control the electronic switches SW2 and Ml, respectively.
  • the controller 12 senses the voltage VC to detect whether the charger 2 is powered or not by the power supply 3, or to detect any data modulated thereon by the charger 2. If is detected that the charger 2 is not receiving any power from the power supply 3 because the voltage VC is low for a predefined period of time, the electronic switch SW2 is controlled to be conductive such that the battery 10 supplies power to the charger 2. If the shaver 1 expects data from the charger 2, the controller 12 controls the electronic switch SW2 to be non-conductive and the electronic switch Ml to be conductive. Due to the impedance Rl, the voltage VC can be modulated by the charger 2, for example with the electronic switch SW3.
  • the controller 12 may first switch on the electronic switch Ml and after a predetermined delay the controller 12 switches on the electronic switch SW2. It is also beneficial to first only switch on the electronic switch Ml to limit the current caused by a short circuit of the terminals T5 and T6 at the interface 12. Such a short circuit may occur when the user is putting the shaver 1 into the charger 2 in a clumsy manner.
  • the controller 12 senses the voltage VC at the interface 12 to detect whether the load formed by the charger 2 is within the expected range and only switches on the electronic switch SW2 if so.
  • Fig. 2 shows a block diagram of another embodiment of a system comprising a power supply, an accessory appliance and a rechargeable electric appliance.
  • the basic operation is similar to that of the system shown in Fig. 2.
  • the major difference is that the interface 12 is formed by magnetically coupled windings LPl, LP2, LSI, LS2 instead of the connector terminals T2, T5, T4, T6. Because transformers are only able to transfer alternate current signals, the charger 2 now has two electronic switches SW30 and SW31 which are alternately switched by the drive signals DS30 and DS31, respectively.
  • Data may be forwarded to the shaver 1 by modulating on/off times of the switches SW30, SW31.
  • the controller 22 senses the voltage VCO at one of the windings to detect a modulation caused by the shaver. This modulation may be a pulse width variation.
  • the diodes D30 and D31 which are arranged in parallel with the main current paths of the electronic switches SW30 and SW31, respectively, enable the current to flow through the primary windings LPl and LP2, respectively after the electronic switches SW30 and SW31 have been switched off. These diodes D30 and D31 may be intrinsic to the switches SW30 and SW31, respectively, or may be separate elements.
  • the cathodes of the diodes D30 and D31 are interconnected to supply the power supply voltage VCC.
  • the shaver 1 receives the alternating signals from the secondary windings LS 1 and LS2 and produces the direct current supply voltage VCC via the rectifiers DI l and D12.
  • the switches SWl 1 and SW12 are alternatively activated with the drive signals DSl 1 and DS 12, respectively, which are supplied by the controller 12.
  • the direct current voltage of the battery 10 is converted into an alternating voltage which can be transferred from the secondary windings LSI and LS2 to the primary windings LPl and LP2.
  • a variation of the on/off times of the switches SWl 1 and SWl 2 can be used to transfer data from the shaver 1 to the charger 2.
  • the controller 12 may use the sensed voltage BV of the battery 10 and the sensed current BI through the battery 10 to switch off the switches SW2, Ml or SWl 1, SW12 when the battery voltage drops below a particular level, or when the current drawn by the charger 2 from the battery 10 is above a particular level.
  • the polarity of the voltage across the resistor R2 indicates whether the battery is being charged or discharged.
  • the voltage BI may be used instead of using the voltage at the interface 12 to detect whether the charger 2 is or is not powered by the power supply 3, the voltage BI may be used. If the charger 2 is not powered, there will be no charge current.
  • the diodes D30, D31, DI l, D12 may be the respective body diodes of the FET's.
  • any reference signs placed between parentheses shall not be construed as limiting the claim.
  • Use of the verb "comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim.
  • the article "a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
  • the invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

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

Abstract

L'invention porte sur un appareil électrique rechargeable (1) qui interagit avec un appareil accessoire (2) et comprend une batterie rechargeable (10), un redresseur (D1 ; D11) agencé en série avec la batterie rechargeable (10) et étant polarisé pour permettre une charge de la batterie rechargeable (10), un élément interrupteur (SW1 ; SW2 ; SW11) en parallèle avec le redresseur (D1 ; D11), et un contrôleur (12) pour commander l'élément interrupteur (SW1 ; SW2 ; SW11) pour être non conducteur lorsque la batterie rechargeable (10) est en cours de charge et pour être conducteur lorsque la batterie rechargeable (10) doit fournir de l'énergie à l'appareil accessoire (2).
PCT/IB2009/050105 2008-01-18 2009-01-12 Appareil électrique rechargeable WO2009090590A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08150402.9 2008-01-18
EP08150402 2008-01-18

Publications (1)

Publication Number Publication Date
WO2009090590A1 true WO2009090590A1 (fr) 2009-07-23

Family

ID=40510631

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/050105 WO2009090590A1 (fr) 2008-01-18 2009-01-12 Appareil électrique rechargeable

Country Status (1)

Country Link
WO (1) WO2009090590A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5835989A (en) * 1994-02-24 1998-11-10 Ricoh Co., Ltd. Battery system which prevents current from flowing during a short-circuiting of the battery terminals
US5898293A (en) * 1996-07-30 1999-04-27 Sanyo Electric Co., Ltd. Method of preventing battery over-discharge and a battery pack with a battery over-discharge prevention circuit
EP1073544A1 (fr) * 1998-04-18 2001-02-07 Braun GmbH Procede pour la transmission de donnees entre un petit appareil electrique et un appareil electrique supplementaire pouvant etre relie a ce dernier, ainsi qu'appareils de configuration correspondante
US20010054880A1 (en) * 2000-06-22 2001-12-27 Fujitsu Limited Charge/discharge control circuit and secondary battery
US20050212489A1 (en) * 2004-03-25 2005-09-29 Denning Bruce S Over voltage transient controller

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5835989A (en) * 1994-02-24 1998-11-10 Ricoh Co., Ltd. Battery system which prevents current from flowing during a short-circuiting of the battery terminals
US5898293A (en) * 1996-07-30 1999-04-27 Sanyo Electric Co., Ltd. Method of preventing battery over-discharge and a battery pack with a battery over-discharge prevention circuit
EP1073544A1 (fr) * 1998-04-18 2001-02-07 Braun GmbH Procede pour la transmission de donnees entre un petit appareil electrique et un appareil electrique supplementaire pouvant etre relie a ce dernier, ainsi qu'appareils de configuration correspondante
US20010054880A1 (en) * 2000-06-22 2001-12-27 Fujitsu Limited Charge/discharge control circuit and secondary battery
US20050212489A1 (en) * 2004-03-25 2005-09-29 Denning Bruce S Over voltage transient controller

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