CHARGING CONTROL DEVICE, CHARGING CONTROL METHOD AND WIRELESS POWER RECEIVING DEVICE EQUIPPED WITH SAME

• US 20160226296A1
• Filed: 09/12/2014
• Published: 08/04/2016
• Est. Priority Date: 09/13/2013
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: WON, Do Hyun, BAE, Su Ho, YONG, Dong Ho, LEE, Jong Heon
• Granted Patent: US 10,069,343 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices

Abstract

A charging control device includes a capacitor, a comparison unit and a switching unit. The capacitor is charged with a voltage converted from power received from a wireless power sending device. The comparison unit compares the voltage of the capacitor with a reference voltage, and generates an output signal according to the result of the comparison. The switching unit is connected to the front end of the capacitor and is switched by the output signal from the comparison unit so as to control whether to supply the converted voltage to a load terminal.

Claims

1. A charging control device for charging a load with a voltage converted from a power received from a wireless power transmitter, the charging control device comprising:

a capacitor charged with the converted voltage;

a comparator that compares a voltage of the capacitor with a reference voltage and generates an output signal based on the comparison result; and

a switch connected to a front end of the capacitor and switched based on the output signal of the comparator to control a supply of the converted voltage to the load.

2. The charging control device of claim 1, wherein when the voltage of the capacitor is higher than the reference voltage, the switch is open based on the output signal of the comparator and the voltage of the capacitor is supplied to the load.

3. The charging control device of claim 2, wherein, after the capacitor is discharged due to the supply of the voltage of the capacitor to the load, when the voltage of the capacitor is lower than the reference voltage, the switch is turned on based on the output signal of the comparator and the converted voltage is charged in the capacitor so that the voltage of the capacitor is increased.

4. The charging control device of claim 3, wherein when the voltage of the capacitor is higher than the reference voltage due to the increase of the voltage in the capacitor, the switch is open based on the output signal of the comparator and the voltage of the capacitor is supplied to the load.

5. The charging control device of claim 4, wherein while the converted voltage higher than the reference voltage is being supplied, the switch is repeatedly turned on and off and the capacitor is repeatedly charged and discharged so that the voltage of the capacitor is charged in the load.

6. The charging control device of claim 5, wherein the voltage of the capacitor has a pulse waveform approximate to a pulse waveform of the reference voltage due to the charge and discharge of the capacitor.

7. The charging control device of claim 6, wherein the voltage of the capacitor is within a range of ±

10% to ±

30% based on the reference voltage.

8. The charging control device of claim 1, wherein when the voltage of the capacitor is lower than the reference voltage, the switch is turned on based on the output signal of the comparator and the converted voltage is supplied to the capacitor and the load.

9. The charging control device of claim 1, wherein the reference voltage is an optimal charging voltage suitable for charging the load.

10. The charging control device of claim 1, further comprising a controller for generating a control signal to control the switch based on the output signal of the comparator.

11. A charging control method in a device including a capacitor and a switch connected to a front end of the capacitor for charging a load with a voltage converted from a power received from a wireless power transmitter, the charging control method comprising:

charging the capacitor with the converted voltage;

comparing a voltage of the capacitor with a reference voltage and generating an output signal according to the comparison result; and

switching the switch based on the output signal to control a supply of the converted voltage to the load.

12. The charging control method of claim 11, wherein while the converted voltage higher than the reference voltage is being supplied, the switch is repeatedly turned on and off and the capacitor is repeatedly charged and discharged so that the voltage of the capacitor is charged in the load.

13. The charging control device of claim 11, wherein the voltage of the capacitor has a pulse waveform approximate to a pulse waveform of the reference voltage due to the charge and discharge of the capacitor.

14. A wireless power receiver for transferring a power received from a wireless power transmitter to a load, the wireless power receiver comprising:

a receiving coil for receiving an AC power from the wireless power transmitter;

a rectifier for rectifying the AC power into a DC voltage;

a capacitor charged with the rectified DC voltage;

a comparator that compares a voltage of the capacitor with a reference voltage and generates an output signal based on the comparison result; and

a switch connected between the rectifier and the capacitor and switched based on the output signal of the comparator to control a supply of the DC voltage to the load.

15. The wireless power receiver of claim 14, wherein the reference voltage is an optimal charging voltage suitable for charging the load.

16. The wireless power receiver of claim 14, further comprising:

a signal detector for detecting a signal from the rectifier;

a controller for recognizing a state of the load based on the signal detected by the signal detector; and

a modulator disposed between the receiving coil and the rectifier and modulated according to a control signal of the controller,

wherein information is supplied from the receiving coil to a transmitting coil of the wireless power transmitter by modulation of the modulator.

17. A wireless power receiver for transferring a power received from a wireless power transmitter to a load, the wireless power receiver comprising:

a receiving coil for receiving an AC power from the wireless power transmitter;

a rectifier for rectifying the AC power into a DC voltage;

a capacitor charged with the rectified DC voltage;

a controller that compares a voltage of the capacitor with a reference voltage and generates a control signal based on the comparison result; and

a switch connected between the rectifier and the capacitor and switched based on the control signal of the controller to control a supply of the DC voltage to the load.

18. The wireless power receiver of claim 17, wherein the reference voltage is an optimal charging voltage suitable for charging the load.

19. The wireless power receiver of claim 17, further comprising:

a signal detector for detecting a signal from the rectifier;

a controller for recognizing a state of the load based on the signal detected by the signal detector; and

a modulator disposed between the receiving coil and the rectifier and modulated according to the control signal of the controller,

wherein information is supplied from the receiving coil to a transmitting coil of the wireless power transmitter by modulation of the modulator.

20. The wireless power receiver of claim 17, wherein, after the capacitor is discharged due to the supply of the voltage of the capacitor to the load, when the voltage of the capacitor is lower than the reference voltage, the switch is turned on based on the output signal of the comparator and the converted voltage is charged in the capacitor so that the voltage of the capacitor is increased.