RESONANCE CIRCUIT, WIRELESS POWER SUPPLY TRANSMITTER, SWITCH CIRCUIT AND FULL-BRIDGE TRANSMITTING CIRCUIT

• US 20190222067A1
• Filed: 10/18/2016
• Published: 07/18/2019
• Est. Priority Date: 06/01/2016
• Status: Active Grant

• Current Assignee: Zonecharge Wireless Power Technology Co., Ltd.
• Original Assignee: Zonecharge Wireless Power Technology Co., Ltd.
• Inventors: ZHU, Sizhong, XU, Baohua, HE, Zhi, XU, Xiangdong
• Granted Patent: US 10,848,004 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

A single-control series resonance circuit, a wireless power supply transmitter, a switch circuit and a full-bridge transmitting circuit, wherein the single-control series resonance circuit comprises: a switching tube, a resonance transmitting coil and a resonance capacitor. One end of the resonance transmitting coil is connected to one end of the resonance capacitor, the other end of the resonance transmitting coil is connected to the positive pole of a power supply, and the other end of the resonance capacitor is grounded. A first end of the switching tube is connected to one end of the resonance capacitor, and a second end of the switching tube is connected to the other end of the resonance capacitor. The circuit of the single-control series resonance circuit is very simple, the costs are low, and the EMC characteristics are good.

Claims

1. A single-control series resonance circuit, applied for wireless power supply, comprising a switch transistor, a resonance transmitting coil, and a resonance capacitor, wherein:

one terminal of the resonance transmitting coil is connected to one terminal of the resonance capacitor, another terminal of the resonance transmitting coil is connected to a positive pole of a power source, another terminal of the resonance capacitor is grounded, a first terminal of the switch transistor is connected to the one terminal of the resonance capacitor, and a second terminal of the switch transistor is connected to the other terminal of the resonance capacitor.

2. The single-control series resonance circuit according to claim 1, wherein a frequency of a signal driving the switch transistor is the same as a resonant frequency of the resonance transmitting coil and the resonance capacitor.

3. A complementary wireless power transmitter, comprising:

a signal source, comprising N signal output terminals, wherein the signal source generates N signals respectively corresponding to the N signal output terminals, the N signals have a same frequency, a phase difference of the N signals is 360°

/N, and N is a positive integer greater than or equal to 2 and less than or equal to 360; and

N resonance transmitters, wherein an input terminal of each of the N resonance transmitters is connected to one of the N signal output terminals of the signal source, each of the N resonance transmitters comprises a resonance circuit, the resonance circuit comprises a resonance transmitting coil, a resonance capacitor, and a switch transistor, and an angle between planes at which the N resonance transmitting coils are located is a preset angle, and

wherein one terminal of the resonance transmitting coil is connected to one terminal of the resonance capacitor, another terminal of the resonance transmitting coil is connected to a positive pole of a power source, and another terminal of the resonance capacitor is grounded, a control terminal of the switch transistor is connected to one of the N signal output terminals of the signal source, a first terminal of the switch transistor is connected to the one terminal of the resonance capacitor, and a second terminal of the switch transistor is connected to the other terminal of the resonance capacitor.

4. The complementary wireless power transmitter according to claim 3, wherein each of the N resonance transmitters comprises a drive amplifier, an input terminal of the drive amplifier is connected to one of the N signal output terminals of the signal source, and an output terminal of the drive amplifier is connected to the control terminal of the switch transistor.

5. The complementary wireless power transmitter according to claim 3, wherein a frequency of the N signals outputted by the signal source is the same as a resonant frequency of the resonance transmitting coil and the resonance capacitor.

6. The complementary wireless power transmitter according to claim 3, wherein a duty ratio of each of the N signals is less than 50%.

7. A switch circuit, applied to an LC series resonant ring, wherein

the LC series resonant ring comprises a resonance transmitting coil and a resonance capacitor, one terminal of the resonance transmitting coil is connected to one terminal of the resonance capacitor, another terminal of the resonance transmitting coil is connected to a positive pole of a power source, another terminal of the resonance capacitor is grounded,

the switch circuit comprises N switch transistors connected in parallel, first terminals of the N switch transistors are connected to the one terminal of the resonance capacitor, second terminals of the N switch transistors is connected to the other terminal of the resonance capacitor, and N is a positive integer greater than or equal to 2, and

only one of the N switch transistors is turned on at a time instant, a sum of turn-on frequencies of the N switch transistors equals to a resonant frequency of the LC series resonant ring, and the turn-on frequency is a frequency at which the switch transistor is turned on.

8. The switch circuit according to claim 7, further comprising:

a signal source, wherein

the signal source comprises N signal output terminals and generates N control signals respectively corresponding to the N signal output terminals,

the N signal output terminals are respectively connected to control terminals of the N switch transistors, and

in the N control signals outputted by the signal source, at least N time instants for outputting a high level form an arithmetic progression with a resonant period of the LC series resonant ring as a common difference, and an amplitude of the high level of each of the N control signals is greater than or equal to a turn-on voltage of one of the N switch transistors driven by the control signal.

9. The switch circuit according to claim 8, wherein the signal source further comprises N drive amplifiers, each of the N control signals generated by the signal source is outputted via one of the N drive amplifiers, and output terminals of the N drive amplifiers are the N signal output terminals of the signal source.

10. A multi-control series resonance circuit, comprising the switch circuit according to claim 7, and an LC series resonant ring, wherein the LC series resonant ring comprises a resonance transmitting coil and a resonance capacitor, one terminal of the resonance transmitting coil is connected to one terminal of the resonance capacitor, another terminal of the resonance transmitting coil is connected to a positive pole of a power source, and another terminal of the resonance capacitor is grounded.

14. The multi-control series resonance circuit according to claim 10, further comprising:

a signal source, wherein

the signal source comprises N signal output terminals and generates N control signals respectively corresponding to the N signal output terminals,

the N signal output terminals are respectively connected to control terminals of the N switch transistors, and

in the N control signals outputted by the signal source, at least N time instants for outputting a high level form an arithmetic progression with a resonant period of the LC series resonant ring as a common difference, and an amplitude of the high level of each of the N control signals is greater than or equal to a turn-on voltage of one of the N switch transistors driven by the control signal.

15. The multi-control series resonance circuit according to claim 14, wherein the signal source further comprises N drive amplifiers, each of the N control signals generated by the signal source is outputted via one of the N drive amplifiers, and output terminals of the N drive amplifiers are the N signal output terminals of the signal source.

11. A full-bridge transmitting circuit driven by a single power source, applied for wireless power supply, comprising three resonant ring circuits, two switch transistors, and a driving power source, wherein

the three resonant ring circuits are a first resonant ring circuits, a second resonant ring circuit, and a third resonant ring circuit, and the two switch transistors are a first switch transistor and a second switch transistor,

the first switch transistor is connected in parallel with a resonance capacitor of the first resonant ring circuit, the second switch transistor is connected in parallel with a resonance capacitor of the third resonant ring circuit, and the second resonant ring circuit is connected between a midpoint of the first resonant ring circuit and a midpoint of the third resonant ring circuit,

the first resonant ring circuit and the first switch transistor form a first single-control series resonance circuit, and the third resonant ring circuit and the second switch transistor form a second single-control series resonance circuit,

each of the first single-control series resonance circuit and the second single-control series resonance circuit comprises a switch transistor, a resonance transmitting coil, and a resonance capacitor, and

one terminal of the resonance transmitting coil is connected to one terminal of the resonance capacitor, another terminal of the resonance transmitting coil is connected to a positive pole of a power source, another terminal of the resonance capacitor is grounded, a first terminal of the switch transistor is connected to the one terminal of the resonance capacitor, and a second terminal of the switch transistor is connected to the other terminal of the resonance capacitor.

12. The full-bridge transmitting circuit driven by a single power source according to claim 11, wherein a frequency of a signal driving the first switch transistor and a frequency of a signal driving the second switch transistor are complementary.

13. The full-bridge transmitting circuit driven by a single power source according to claim 11, wherein the second resonant ring circuit comprises a second resonance capacitor and a second resonance transmitting coil, and the second resonance capacitor and the second resonance transmitting coil are connected in series or in parallel.