Wireless power controller and wireless power transmitter using the same

• US 10,205,349 B2
• Filed: 11/09/2016
• Issued: 02/12/2019
• Est. Priority Date: 03/22/2016
• Status: Active Grant

• Current Assignee: Wit Co., Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Cho, Sang Ho, Jeong, In Wha, Ko, Tae Seok, Kim, Hyo Young
• Primary Examiner(s): Chang, Joseph
• Application Number:
  US15/347,234
• Publication Number:
  US 20170279307A1
• Time in Patent Office: 825 Days
• Field of Search: 307104
• 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

Abstract

A wireless power transmitter includes a wireless power controller configured to receive an alternating current (AC) voltage, to convert the AC voltage into a direct current (DC) voltage, and to generate an induced current from the DC voltage according to a switching control for a transformer; and a resonator configured to be resonated by the induced current to wirelessly output charging power.

Claims

1. A wireless power transmitter, comprising:

a wireless power controller configured to receive an alternating current (AC) voltage, to convert the AC voltage into a direct current (DC) voltage, and to generate an induced current from the DC voltage according to a switching control for a transformer;

a resonator configured to be resonated by the induced current to wirelessly output charging power;

a switch; and

a switching controller configured to control a switching operation of the switch.

2. The wireless power transmitter of claim 1, wherein the wireless power controller further comprises:

an AC-DC converter configured to receive the AC voltage and to output the DC voltage;

a transformer having a primary coil through which an alternating current induced from the DC voltage flows, and configured to output the induced current in which the alternating current is reduced according to a turns ratio of the primary coil and a secondary coil; and

wherein the switch is configured to perform the switching operation to induce the alternating current in the primary coil from the DC voltage.

3. The wireless power transmitter of claim 2, wherein the switching controller is further configured to adjust either one or both of a switching frequency and a switching duty of the switch in response to a ripple in the DC voltage.

4. The wireless power transmitter of claim 3, wherein the switching controller is further configured to adjust the switching frequency or the switching duty of the switch so that amplitude of the alternating current is decreased in response to the DC voltage exceeding a reference level.

5. The wireless power transmitter of claim 3, wherein the switching controller is further configured to adjust either one or both of the switching frequency and the switching duty of the switch so that amplitude of the alternating current is increased in response to the DC voltage being lower than a reference level.

6. The wireless power transmitter of claim 2, wherein the AC-DC converter comprises:

a rectifier configured to receive the AC voltage and rectify the received AC voltage; and

a smoothing capacitor configured to smooth an output of the rectifier, wherein the wireless power transmitter further comprises a resonance capacitor connected to the smoothing capacitor and the primary coil.

7. The wireless power transmitter of claim 2, wherein the AC-DC converter comprises:

a rectifier configured to receive the AC voltage and rectify the received AC voltage; and

a smoothing capacitor configured to smooth an output of the rectifier, wherein

the switch comprises;

a first switch having one terminal connected to one terminal of the smoothing capacitor; and

a second switch having one terminal connected to the other terminal of the first switch and the other terminal connected to the other terminal of the smoothing capacitor.

8. The wireless power transmitter of claim 7, wherein one terminal of the primary coil is connected to the other terminal of the first switch and one terminal of the second switch, and

the other terminal of the primary coil is connected to the other terminal of the second switch and the other terminal of the smoothing capacitor.

9. A wireless power controller, comprising:

an alternating current (AC) to direct current (DC) (AC-DC) converter configured to receive an AC voltage and output a DC voltage;

a transformer having a primary coil through which an alternating current induced from the DC voltage flows, and configured to output an induced current in which the alternating current is reduced according to a turns ratio of the primary coil and a secondary coil;

a switch configured to perform a switching operation to induce the alternating current in the primary coil from the DC voltage; and

a switching controller configured to control the switching operation of the switch.

10. The wireless power controller of claim 9, wherein the switching controller is further configured to adjust either one or both of a switching frequency and a switching duty of the switch in response to a ripple in the DC voltage.

11. The wireless power controller of claim 9, wherein the AC-DC converter comprises:

a rectifier configured to receive the AC voltage and rectify the received AC voltage; and

a smoothing capacitor configured to smooth an output of the rectifier.

12. The wireless power controller of claim 11, further comprising:

a resonance capacitor connected to the smoothing capacitor and the primary coil.

13. The wireless power controller of claim 11, wherein the switch comprises:

a first switch comprising one terminal connected to one terminal of the smoothing capacitor; and

a second switch comprising one terminal connected to the other terminal of the first switch and the other terminal connected to the other terminal of the smoothing capacitor.

14. The wireless power controller of claim 13, wherein one terminal of the primary coil is connected to the other terminal of the first switch and one terminal of the second switch, and

another terminal of the primary coil is connected to another terminal of the second switch and the other terminal of the smoothing capacitor.

15. A wireless power transmitter, comprising:

a switching controller configured to adaptively adjust either one or both of a switching frequency and a duty cycle of a switch;

a resonator coil wirelessly outputting charging power;

a switch coupling the controller to the resonator coil; and

a transformer interposed between the switch and the resonator coil;

wherein the switching controller is configured to control a switching operation of the switch and control a flow of current to the resonator coil.

16. The wireless power transmitter of claim 15, wherein the switching controller is further configured to adaptively adjust either one or both of the switching frequency and the duty cycle of the switch in response to a detected ripple.

17. The wireless power transmitter of claim 15, wherein the switch is coupled to a primary coil of the transformer and is configured to selectively induce a current in a secondary coil of the transformer for provision to the resonator coil.

18. The wireless power transmitter of claim 16, further comprising:

an alternating current (AC) to direct current (DC) converter, the AC-DC converter being configured to provide a direct current to the transformer and the switching controller.