EFFICIENT POWER TRANSMITTING TERMINAL, CONTACTLESS POWER TRANSMISSION DEVICE AND POWER TRANSMISSION METHOD

• US 20170040844A1
• Filed: 07/06/2016
• Published: 02/09/2017
• Est. Priority Date: 08/04/2015
• Status: Active Grant

• Current Assignee: Ningbo Weie Electronic Technology Co., Ltd.
• Original Assignee: Ningbo Weie Electronic Technology Co., Ltd.
• Inventors: SU, Hengyi
• Granted Patent: US 10,186,908 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

An efficient power transmitting terminal, a contactless power transmission device and a power transmission method are disclosed herein. By adjusting the equivalent output impedance of the DC-AC voltage converter through a soft-switching control circuit composed of an inductor or an inductor and a capacitor, the equivalent output impedance is maintained at inductive impedance. According to the feature of current of inductive impedance lagging behind the voltage, the voltage of the switching device in the DC-AC voltage converter reduces to zero before switching-on, to achieve zero-voltage switching-on.

Claims

1. An efficient power transmitting terminal, transmitting energy to its isolated power receiving terminal, comprising:

a DC-AC voltage converter configured to receive a DC voltage to output a AC voltage with a preset frequency;

a power transmitting portion, comprising a primary transmitter coil, wherein the primary transmitter coil receives the AC voltage to generate an alternating magnetic field, to transmit energy to the power receiving terminal; and

a soft-switching control circuit, connected between the DC-AC voltage converter and the power transmitting portion, and configured to adjust an equivalent output impedance of the DC-AC voltage converter, so that the equivalent output impedance is inductive impedance;

wherein the preset frequency is consistent with a system operating frequency at the power transmitting terminal and the power receiving terminal.

2. The power transmitting terminal according to claim 1, wherein the power transmitting portion further comprises a primary resonant capacitor, a resonant frequency of the primary resonant capacitor and the primary transmitter coil is the preset frequency.

13. The power transmitting terminal according to claim 1, wherein the soft-switching control circuit comprises a first inductor, and two ends of the first inductor are connected to the DC-AC voltage converter and the power transmitting portion respectively.

14. The power transmitting terminal according to claim 13, wherein an inductance value of the first inductor is adjusted according to an operating current of the DC-AC voltage converter.

15. The power transmitting terminal according to claim 2, wherein the soft-switching control circuit comprises a first inductor, and two ends of the first inductor are connected to the DC-AC voltage converter and the power transmitting portion respectively.

16. The power transmitting terminal according to claim 15, wherein an inductance value of the first inductor is adjusted according to an operating current of the DC-AC voltage converter.

17. The power transmitting terminal according to claim 1, wherein the soft-switching control circuit comprises

a first inductor and a first capacitor;

a first end of the first inductor is connected to a first output end of the DC-AC voltage converter, and a second end of the first inductor is connected to the power transmitting portion;

a first end of the first capacitor is connected to a second end of the first inductor, and a second end of the first capacitor is connected to a second output end of the DC-AC voltage converter.

18. The power transmitting terminal according to claim 17, wherein a resonant frequency of the first inductor and the first capacitor is consistent with the preset frequency.

19. The power transmitting terminal according to claim 2, wherein the soft-switching control circuit comprises

a first inductor and a first capacitor;

a first end of the first inductor is connected to a first output end of the DC-AC voltage converter, and a second end of the first inductor is connected to the power transmitting portion;

a first end of the first capacitor is connected to a second end of the first inductor, and a second end of the first capacitor is connected to a second output end of the DC-AC voltage converter.

20. The power transmitting terminal according to claim 19, wherein a resonant frequency of the first inductor and the first capacitor is consistent with the preset frequency.

21. A contactless power transmission device, comprising:

a power transmitting terminal of claims 1; and

a power receiving terminal;

wherein the power transmitting terminal and the power receiving terminal are isolated; and

wherein the power receiving terminal comprises a secondary receiving coil and a rectifying and filtering circuit, the secondary receiving coil induces an alternating magnetic field generating from the primary transmitter coil to obtain a corresponding alternating voltage, the rectifying and filtering circuit converts the alternating voltage to an appropriate DC voltage to supply an output load.

22. A contactless power transmission device, comprising:

a power transmitting terminal of claims 2; and

a power receiving terminal;

wherein the power transmitting terminal and the power receiving terminal are isolated; and

wherein the power receiving terminal comprises a secondary receiving coil and a rectifying and filtering circuit, the secondary receiving coil induces an alternating magnetic field generating from the primary transmitter coil to obtain a corresponding alternating voltage, the rectifying and filtering circuit converts the alternating voltage to an appropriate DC voltage to supply an output load.

23. A contactless power transmission device, comprising:

a power transmitting terminal of claims 13; and

a power receiving terminal;

wherein the power transmitting terminal and the power receiving terminal are isolated; and

wherein the power receiving terminal comprises a secondary receiving coil and a rectifying and filtering circuit, the secondary receiving coil induces an alternating magnetic field generating from the primary transmitter coil to obtain a corresponding alternating voltage, the rectifying and filtering circuit converts the alternating voltage to an appropriate DC voltage to supply an output load.

24. A contactless power transmission device, comprising:

a power transmitting terminal of claims 14; and

a power receiving terminal;

wherein the power transmitting terminal and the power receiving terminal are isolated; and

wherein the power receiving terminal comprises a secondary receiving coil and a rectifying and filtering circuit, the secondary receiving coil induces an alternating magnetic field generating from the primary transmitter coil to obtain a corresponding alternating voltage, the rectifying and filtering circuit converts the alternating voltage to an appropriate DC voltage to supply an output load.

25. A contactless power transmission device, comprising:

a power transmitting terminal of claims 15; and

a power receiving terminal;

wherein the power transmitting terminal and the power receiving terminal are isolated; and

wherein the power receiving terminal comprises a secondary receiving coil and a rectifying and filtering circuit, the secondary receiving coil induces an alternating magnetic field generating from the primary transmitter coil to obtain a corresponding alternating voltage, the rectifying and filtering circuit converts the alternating voltage to an appropriate DC voltage to supply an output load.

26. A contactless power transmission device, comprising:

a power transmitting terminal of claims 16; and

a power receiving terminal;

wherein the power transmitting terminal and the power receiving terminal are isolated; and

wherein the power receiving terminal comprises a secondary receiving coil and a rectifying and filtering circuit, the secondary receiving coil induces an alternating magnetic field generating from the primary transmitter coil to obtain a corresponding alternating voltage, the rectifying and filtering circuit converts the alternating voltage to an appropriate DC voltage to supply an output load.

27. A contactless power transmission device, comprising:

a power transmitting terminal of claims 17; and

a power receiving terminal;

wherein the power transmitting terminal and the power receiving terminal are isolated; and

wherein the power receiving terminal comprises a secondary receiving coil and a rectifying and filtering circuit, the secondary receiving coil induces an alternating magnetic field generating from the primary transmitter coil to obtain a corresponding alternating voltage, the rectifying and filtering circuit converts the alternating voltage to an appropriate DC voltage to supply an output load.

28. A contactless power transmission device, comprising:

a power transmitting terminal of claims 18; and

a power receiving terminal;

wherein the power transmitting terminal and the power receiving terminal are isolated; and

wherein the power receiving terminal comprises a secondary receiving coil and a rectifying and filtering circuit, the secondary receiving coil induces an alternating magnetic field generating from the primary transmitter coil to obtain a corresponding alternating voltage, the rectifying and filtering circuit converts the alternating voltage to an appropriate DC voltage to supply an output load.

29. A contactless power transmission device, comprising:

a power transmitting terminal of claims 19; and

a power receiving terminal;

wherein the power transmitting terminal and the power receiving terminal are isolated; and

wherein the power receiving terminal comprises a secondary receiving coil and a rectifying and filtering circuit, the secondary receiving coil induces an alternating magnetic field generating from the primary transmitter coil to obtain a corresponding alternating voltage, the rectifying and filtering circuit converts the alternating voltage to an appropriate DC voltage to supply an output load.

30. A contactless power transmission device, comprising:

a power transmitting terminal of claims 20; and

a power receiving terminal;

wherein the power transmitting terminal and the power receiving terminal are isolated; and

wherein the power receiving terminal comprises a secondary receiving coil and a rectifying and filtering circuit, the secondary receiving coil induces an alternating magnetic field generating from the primary transmitter coil to obtain a corresponding alternating voltage, the rectifying and filtering circuit converts the alternating voltage to an appropriate DC voltage to supply an output load.

3. (canceled)

4. (canceled)

5. (canceled)

6. (canceled)

7. A contactless power transmission method, transmitting energy through a power transmitting terminal and an isolated power receiving terminal, comprising:

receiving a DC voltage via a DC-AC voltage converter to output an AC voltage with a preset frequency, wherein the preset frequency is consistent with a system operating frequency of the power transmitting terminal and the power receiving terminal;

adjusting an equivalent output impedance of the DC-AC voltage converter, so that the equivalent output impedance is an inductive impedance;

receiving the AC voltage to generate an alternating magnetic field, to transmit energy to the power receiving terminal; and

inducing the alternating magnetic field to obtain a corresponding alternating voltage, to convert the alternating voltage to an appropriate DC voltage to supply an output load.

8. The power transmission method according to claim 7, wherein the soft-switching control circuit is used to adjust and control the equivalent output impedance of the DC-AC voltage converter;

and the soft-switching control circuit includes the first inductor.

9. The power transmission method according to claim 8, wherein an inductance value of inductor is adjusted according to an operating current of the DC-AC voltage converter.

10. The power transmission method according to claim 7, further comprising:

using a soft-switching control circuit to adjust and control the equivalent output impedance of the DC-AC voltage converter;

wherein the soft-switching control circuit includes a first inductor and a first capacitor.

11. The power transmission method according to claim 10, wherein the resonant frequency of the first inductor and the first capacitor is set to be consistent with the preset frequency.

12. (canceled)