Control circuit for controlling a resonant power converter

Patent metadata

Field	Value
Publication number	US-11063533-B2
Application number	US-201816622316-A
Country	US
Kind code	B2
Filing date	Jun 12, 2018
Priority date	Jun 20, 2017
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

The present invention relates to a control circuit (10) for controlling a resonant power converter. It is described to generate (210) a modulation signal. A carrier signal is generates (220), wherein the generation of the carrier signal comprises measuring at least one signal from the power converter. A switching signal is generated (230) that is useable to control a value of at least one magnitude of the resonant power converter based on the modulation signal and the carrier signal.

First claim

The invention claimed is:

1. A power supply, comprising:
a resonant power converter; and
a control circuit for controlling the resonant power converter, the control circuit comprising:
a modulator signal generator configured to generate a modulation signal;
a carrier signal generator configured to generate a carrier signal by measuring at least one signal from the resonant power converter;
a pulse width signal generator configured to generate a switching signal to control a value of at least one magnitude of the resonant power converter based on the modulation signal and the carrier signal;

wherein the resonant power converter comprises a pulse duration monitor configured to measure at least one duration of the switching signal, wherein the at least one duration comprises a duration of the switching signal in a low state and a duration of the switching signal in a high state, and wherein the pulse width signal generator is configured to generate the switching signal that is in the low state when the modulation signal is greater than the carrier signal and the at least one duration of the switching signal is less than or equal to a threshold value.

2. The power supply according to claim 1 , wherein the pulse width signal generator is configured to generate the switching signal that is in the low state when the modulation signal is less than the carrier signal.

3. The power supply according to claim 1 , wherein the pulse width signal generator is configured to generate the switching signal that is in the high state based on the modulation signal and the carrier signal.

4. The power supply according to claim 3 , wherein the pulse width signal generator is configured to generate the switching signal that is in the high state when the modulation signal is greater than the carrier signal.

5. The power supply according to claim 3 , wherein the pulse width signal generator is configured to generate the switching signal that is in an intermediate state, between the low state and the high state, based on the modulation signal and the carrier signal.

6. The power supply according to claim 1 , wherein the at least one signal from the resonant power converter from which the carrier signal is generated comprises a resonant voltage.

7. The power supply according to claim 1 , wherein the at least one signal from the resonant power converter from which the carrier signal is generated comprises a resonant current.

8. The power supply according to claim 7 , wherein the at least one signal from the resonant power converter from which the carrier signal is generated comprises a resonant voltage multiplied by a sign of the resonant current.

9. A method for controlling a resonant power converter, comprising:
generating a modulation signal;
generating a carrier signal by measuring at least one signal from the power converter;
generating a switching signal to control a value of at least one magnitude of the resonant power converter based on the modulation signal and the carrier signal;
measuring at least one duration of the switching signal, wherein the at least one duration comprises a duration of the switching signal in a low state and a duration of the switching signal in a high state; and
generating the switching signal that is in the low state when the modulation signal is greater than the carrier signal and the at least one duration of the switching signal is less than or equal to a threshold value.

10. The method according to claim 9 , wherein the switching signal is generated in a low state when the modulation signal is less than the carrier signal.

11. The method according to claim 9 , comprising generating the switching signal that is in the high state based on the modulation signal and the carrier signal.

12. A non-transitory computer-readable medium having one or more executable instructions stored thereon which, when executed by at least one processor, cause the at least one processor to perform a method for controlling a resonant power converter, the method comprising:
generating a modulation signal;
generating a carrier signal by measuring at least one signal from the power converter;
generating a switching signal to control a value of at least one magnitude of the resonant power converter based on the modulation signal and the carrier signal;
measuring at least one duration of the switching signal, wherein the at least one duration comprises a duration of the switching signal in a low state and a duration of the switching signal in a high state; and
generating the switching signal that is in the low state when the modulation signal is greater than the carrier signal and the at least one duration of the switching signal is less than or equal to a threshold value.

Assignees

• Koninklijke Philips Nv

Inventors

• Garcia I Tormo Albert
• Woywode Oliver
• Kahl Christoph
• Wagner Bernhard

Classifications

• H02M1/0058

  by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero (using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826) · CPC title

• H02M7/53871 Primary

  with automatic control of output voltage or current · CPC title

• H02M1/0009

  Devices or circuits for detecting current in a converter · CPC title

• H02M7/4815

  Resonant converters (H02M7/4811 and H02M7/4826 take precedence) · CPC title

• H02M1/00

  Details of apparatus for conversion · CPC title