Resonance oscillator circuit and contactless power supply system

Patent metadata

Field	Value
Publication number	US-2021203187-A1
Application number	US-202017106865-A
Country	US
Kind code	A1
Filing date	Nov 30, 2020
Priority date	Dec 27, 2019
Publication date	Jul 1, 2021
Grant date	—

Abstract

A resonance oscillator circuit is provided to include first and second oscillators. The first oscillator includes a first LC resonator circuit and an amplifier element, and oscillates by shifting a phase of an output voltage with a predetermined phase difference and feeding the output voltage back to the amplifier element. The second oscillator oscillates by generating a gate signal, which has a frequency identical to that of the output voltage, and drives the amplifier element, by shifting the phase of the output voltage with the phase difference and feeding the gate signal back to an input terminal of the amplifier element, by using the amplifier element as a switching element and using the first oscillator as a feedback circuit. The phase difference is a value substantially independent of an inductance of the first LC resonator circuit and a load, to which the output voltage is applied.

First claim

What is claimed is:

1 . A resonance oscillator circuit comprising:
a first oscillator that includes a first LC resonator circuit and an amplifier element, and oscillates by shifting a phase of an output voltage with a predetermined phase difference and feeding the output voltage back to the amplifier element; and a second oscillator that oscillates by generating a gate signal, which has a frequency identical to that of the output voltage and drives the amplifier element, by shifting the phase of the output voltage with the phase difference and feeding the gate signal back to an input terminal of the amplifier element, by using the amplifier element as a switching element and using the first oscillator as a feedback circuit, wherein the phase difference is a value substantially independent of an inductance of the first LC resonator circuit and a load, to which the output voltage is applied.

2 . The resonance oscillator circuit as claimed in claim 1 , further comprising a circuit that is capable of switching the amplifier element by the gate signal based on an input voltage, a circuit voltage, or an external voltage, generates a predetermined voltage, and applies the predetermined voltage to the input terminal of the amplifier element.

3 . The resonance oscillator circuit as claimed in claim 1 ,
wherein the amplifier element is a switching element.

4 . The resonance oscillator circuit as claimed in claim 3 ,
wherein the gate signal is a binary signal that turns on or off the switching element.

5 . The resonance oscillator circuit as claimed in claim 1 ,
wherein the first oscillator is any one of a Colpitts oscillator, a Hartley oscillator, and a back-coupling oscillator.

6 . The resonance oscillator circuit as claimed in claim 1 ,
wherein the second oscillator is any one of a class-E −1 oscillator and a class-E oscillator.

7 . The resonance oscillator circuit as claimed in claim 1 , further comprising a constant current output circuit that is provided at a front stage of the first LC resonator circuit, and control an output current of the resonance oscillator circuit to be a constant current based on an input voltage inputted after oscillated.

8 . A contactless power supply system comprising:
a power transmission apparatus comprising a resonance oscillator circuit; and a power reception apparatus, wherein the resonance oscillator circuit comprises: a first oscillator that includes a first LC resonator circuit and an amplifier element, and oscillates by shifting a phase of an output voltage with a predetermined phase difference and feeding the output voltage back to the amplifier element; and a second oscillator that oscillates by generating a gate signal, which has a frequency identical to that of the output voltage and drives the amplifier element, by shifting the phase of the output voltage with the phase difference and feeding the gate signal back to an input terminal of the amplifier element, by using the amplifier element as a switching element and using the first oscillator as a feedback circuit, wherein the phase difference is a value substantially independent of an inductance of the first LC resonator circuit and a load, to which the output voltage is applied, wherein the power reception apparatus comprises: a second LC resonator circuit that is coupled to the first LC resonator circuit, and receives an AC power from the first LC resonator circuit, and a first rectifier circuit that rectifies the AC power received by the second LC resonator circuit to a DC voltage, and outputs the DC voltage to a predetermined load, and wherein the phase difference is a value substantially independent of inductances of the first and second LC resonator circuits and a load, to which the output voltage is applied.

9 . The contactless power supply system as claimed in claim 8 ,
wherein the power reception apparatus further comprises a DC/DC converter that is inserted between the first rectifier circuit and the load, and converts the DC voltage from the first rectifier circuit into a predetermined DC voltage.

10 . The contactless power supply system as claimed in claim 9 ,
wherein the DC/DC converter further comprises a constant current output circuit that is provided at a subsequent stage of the DC/DC converter, and outputs a constant output current to the load based on the converted DC voltage.

11 . The contactless power supply system as claimed in claim 8 ,
wherein the power transmission apparatus further comprises a second rectifier circuit that is provided at a front stage of the resonance oscillator circuit, rectifies a predetermined AC voltage to a DC voltage, and outputs the DC voltage to the resonance oscillator circuit.

12 . The contactless power supply system as claimed in claim 8 ,
wherein the power reception apparatus further comprises a power receiving controller that detects control information necessary for controlling at least one of an output voltage and an output current of the power reception apparatus, and wirelessly transmits the control information, and wherein the power transmission apparatus further comprises: a power factor correction circuit that is provided at a front stage of the resonance oscillator circuit, and corrects a power factor by shaping a waveform of the output voltage based on a predetermined AC voltage, and a power factor correction circuit controller that wirelessly receives the control information wirelessly transmitted, and controls an operation of the power factor correction circuit based on the control information.

13 . The contactless power supply system as claimed in claim 12 ,
wherein the power reception apparatus further comprises a DC/DC converter that is inserted between the first rectifier circuit and the load, and converts the DC voltage from the first rectifier circuit into a predetermined DC voltage.

14 . The contactless power supply system as claimed in claim 13 ,
wherein the DC/DC converter further comprises a constant current output circuit that is provided at a subsequent stage of the DC/DC converter, and outputs a predetermined output current to the load based on the converted DC voltage.

Assignees

• Omron Tateisi Electronics Co
• Univ Chiba Nat Univ Corp

Inventors

• Mishima Taichi
• Nagaoka Shingo
• Uematsu Takeshi
• Sekiya Hiroo

Classifications

• Y02B70/10

  Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title

• H03B5/1296

  the feedback circuit comprising a transformer · CPC title

• H03B2200/0034

  including a buffer amplifier · CPC title

• H03B5/1203

  the amplifier being a single transistor · CPC title