Title:
CIRCUIT FOR SUPPLYING POWER TO SWITCH POWER SOURCE CONTROL CIRCUIT ON BASIS OF AUXILIARY WINDING
Document Type and Number:
WIPO Patent Application WO/2024/066493
Kind Code:
A1
Abstract:
A circuit for supplying power to a switch power source control circuit on the basis of an auxiliary winding, which circuit relates to the technical field of switch power sources. The circuit comprises: an auxiliary winding, a switch tube, an LDO, a first diode, a second diode, a forward energy storage capacitor and a flyback energy storage capacitor, wherein the auxiliary winding, the flyback energy storage capacitor and the switch tube form a flyback energy storage loop to charge the flyback energy storage capacitor. In a forward state, if the voltage of the forward energy storage capacitor is less than the voltage of an output end of the LDO, the flyback energy storage capacitor supplies power to a control circuit, and if the voltage of the forward energy storage capacitor is greater than the voltage of the output end of the LDO, the forward energy storage capacitor supplies power to the control circuit. Therefore, according to the voltage of the current forward energy storage capacitor, forward energy storage and flyback energy storage are combined to supply power to the control circuit, and the voltage of a power source end of the control circuit is effectively reduced by means of the voltage stabilization characteristic of the LDO.
Inventors:
YING ZHENG (CN)
WANG FENG (CN)
CHEN BO (CN)
WANG FENG (CN)
CHEN BO (CN)
Application Number:
PCT/CN2023/100603
Publication Date:
April 04, 2024
Filing Date:
June 16, 2023
Export Citation:
Assignee:
BCD SHANGHAI MICRO ELECTRONICS COMPANY LTD (CN)
International Classes:
H02M3/28; H02M3/335
Foreign References:
| CN115498883A | 2022-12-20 | |||
| CN111917301A | 2020-11-10 | |||
| CN109980901A | 2019-07-05 | |||
| CN110417270A | 2019-11-05 | |||
| CN111082640A | 2020-04-28 | |||
| US20220173664A1 | 2022-06-02 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW CO., LTD. (CN)
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