Wireless power transmitting device

• US 9,899,881 B2
• Filed: 04/15/2016
• Issued: 02/20/2018
• Est. Priority Date: 06/08/2015
• Status: Active Grant

• Current Assignee: Wit Co., Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Jeong, In Wha, Choi, Young Woon, Heo, Tae Won
• Primary Examiner(s): Houston, Adam
• Application Number:
  US15/130,028
• Publication Number:
  US 20160359369A1
• Time in Patent Office: 676 Days
• Field of Search: 307104, 320108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H02M 1/0074 Plural converter units whose inputs are connected in series
• CPC Class Codes: H02M 7/537 using semiconductor devices only, e.g. single switched pulse inverters

Abstract

A wireless power transmitting device includes: a rectifier configured to rectify alternating current (AC) power; a capacitor configured to store the rectified AC power as direct current (DC) power; a voltage divider configured to divide a voltage of the DC power; and a wireless power transmitter configured to wirelessly transmit power using the voltage divided by the voltage divider.

Claims

1. A wireless power transmitting device comprising:

a rectifier configured to rectify alternating current (AC) power;

a capacitor configured to store the rectified AC power as direct current (DC) power;

a voltage divider configured to divide a voltage of the DC power; and

a wireless power transmitter configured to transmit power using the voltage divided by the voltage divider.

2. The wireless power transmitting device of claim 1, wherein the voltage divider comprises:

a first capacitor configured to divide a voltage of the DC power and storing a first divided power; and

a second capacitor configured to divide the voltage of the DC power and storing a second divided power.

3. The wireless power transmitting device of claim 2, wherein the wireless power transmitter comprises:

a first wireless power transmitter configured to wirelessly transmit power using the first divided power; and

a second wireless power transmitter configured to wirelessly transmit power using the second divided power.

4. The wireless power transmitting device of claim 3, wherein:

the first wireless power transmitter comprises a first DC-AC converter configured to convert a voltage of the first divided power into a first output voltage for wireless power transmission, and a first transmitting resonator configured to transmit power according to the first output voltage; and

the second wireless power transmitter comprises a second DC-AC converter configured to convert a voltage of the second divided power into a second output voltage for wireless power transmission, and a second transmitting resonator configured to transmit power according to the second output voltage.

5. The wireless power transmitting device of claim 4, wherein each of the first DC-AC converter and the second DC-AC converter comprise a serially connected half bridge or full bridge structure.

6. The wireless power transmitting device of claim 4, wherein:

the first transmitting resonator comprises a capacitor and an inductor, configured to determine a first resonance frequency; and

the second transmitting resonator comprises a capacitor and an inductor, configured to determine a second resonance frequency.

7. The wireless power transmitting device of claim 4, wherein a resonance frequency of the first transmitting resonator and a resonance frequency of the second transmitting resonator are different.

8. A wireless power transmitting device comprising:

a rectifier configured to rectify alternating current (AC) power;

an input capacitor configured to store the rectified Ac power as direct current (DC) power;

a voltage divider comprising a plurality of capacitors connected to the capacitor in parallel and configured to divide a voltage of the DC power; and

a wireless power transmitter connected to one end of at least one of the capacitors and configured to wirelessly transmit power.

9. The wireless power transmitting device of claim 8, wherein the voltage divider includes:

a first voltage divider comprising a plurality of capacitors configured to divide and store a voltage of DC power stored in the input capacitor and a first capacitor switch selecting a voltage of one end of one of the capacitors as a first input voltage; and

a second voltage divider including a plurality of capacitors configured to divide and store a voltage of DC power stored in the input capacitor and a second capacitor switch selecting a voltage of one end of one of the capacitors as a second input voltage.

10. The wireless power transmitting device of claim 9, wherein the wireless power transmitter includes:

a first wireless power transmitter configured to wirelessly transmit power using the first input voltage; and

a second wireless power transmitter configured to wirelessly transmit power using the second input voltage.

11. The wireless power transmitting device of claim 10, wherein:

the first wireless power transmitter comprises a first DC-AC converter configured to convert the first input voltage into a first output voltage for wireless power transmission, and a first transmitting resonator configured to transmit power according to the first output voltage; and

the second wireless power transmitter comprises a second DC-AC converter configured to convert the second input voltage into a second output voltage for wireless power transmission, and a second transmitting resonator configured to transmit power according to the second output voltage.

12. The wireless power transmitting device of claim 11, wherein each of the first DC-AC converter and the second DC-AC converter comprise a serially connected half bridge or full bridge structure.

13. The wireless power transmitting device of claim 11, wherein:

the first transmitting resonator comprises a capacitor and an inductor, configured to determine a first resonance frequency; and

the second transmitting resonator comprises a capacitor and an inductor, configured to determine a second resonance frequency.

14. The wireless power transmitting device of claim 13, wherein a resonance frequency of the first transmitting resonator and a resonance frequency of the second transmitting resonator are different.

15. A method of controlling a wireless power transmitter, comprising:

identifying a wireless power receiver characteristic;

selectively dividing an input voltage into a divided voltage, using a multi-tap capacitor network, according to the identified wireless power receiver characteristic; and

,

adaptively adjusting a duty cycle of a DC-AC converter or capacitance of a variable capacitor, or combinations thereof, to transform the divided voltage into a wireless power transmission voltage substantially corresponding to the identified wireless power receiver characteristic.

16. The method of controlling a wireless power transmitter of claim 15, further comprising actuating a rectifier to rectify a first voltage to the input voltage.

17. The method of controlling a wireless power transmitter of claim 15, wherein the selectively dividing the input voltage comprises executing a controller to selectively actuate a switch coupled to the multi-tap capacitor network based on the identified wireless power receiver characteristic.

18. The method of controlling a wireless power transmitter of claim 15, wherein a controller is executed to adaptively adjust the duty cycle or the capacitance of the variable capacitor, or combinations thereof, based on a detected harmonic component or electromagnetic interference (EMI), or combinations thereof, to iteratively adjust the wireless power transmission voltage to approximate a voltage corresponding to the identified wireless power receiver characteristic.

19. The method of controlling a wireless power transmitter of claim 18, wherein the duty cycle is adaptively adjusted centered approximately around a 0.5 duty cycle.

20. The method of controlling a wireless power transmitter of claim 15, further comprising selectively actuating one of a plurality of resonators based on the identified wireless power receiver characteristic.

21. The method of controlling a wireless power transmitter of claim 20, wherein a first resonator of the plurality of resonators is selectively actuated responsive to a detected Wireless Power Consortium (WPC) or Power Matters Alliance (PMA) wireless power receiver characteristic;

and a second resonator of the plurality of resonators is selectively actuated responsive to a detected Alliance For Wireless Power (A4WP) wireless power receiver characteristic.

22. The method of controlling a wireless power transmitter of claim 20, wherein the first resonator of the plurality of resonators is selectively actuated for magnetic inductance based wireless power transmission and a second resonator of the plurality of resonators is selectively actuated for magnetic resonance based wireless power transmission.