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Title:
SWITCHING POWER SUPPLY, AND SELF-POWER SUPPLY CIRCUIT AND SELF-POWER SUPPLY METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/087623
Kind Code:
A1
Abstract:
The present application relates to a switching power supply, and a self-power supply circuit and a self-power supply method therefor. The self-power supply circuit for a switching power supply comprises: a charging capacitor for storing power and supplying the power to a switching power supply chip; a voltage-withstanding switching transistor for obtaining a power supply voltage of a primary winding and outputting a charging voltage for charging the charging capacitor; a charging switching transistor for controlling whether to charge the charging capacitor; a current sampler for sampling a charging current of the charging capacitor; an adjustment control transistor for limiting the charging current of the charging capacitor; a current limiting control module for controlling an on state of the adjustment control transistor according to the charging current; a charging control module preset with charging requirements and used for outputting a turn-on switching signal for controlling whether to turn on the adjustment control transistor; and an inverter for obtaining the turn-on switching signal and controlling the current limiting control module or the charging control module to be connected to the adjustment control transistor.

Inventors:
ZHANG JIE (CN)
ZHENG LINGBO (CN)
WANG FULONG (CN)
LIN XINCHUN (CN)
Application Number:
PCT/CN2023/097175
Publication Date:
May 02, 2024
Filing Date:
May 30, 2023
Export Citation:
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Assignee:
LII SEMICONDUCTOR CO LTD (CN)
International Classes:
H02M3/335; H02M1/08; H02M1/32
Foreign References:
CN115589156A2023-01-10
CN106059279A2016-10-26
CN114050711A2022-02-15
JP2015008599A2015-01-15
Other References:
XIONG, QUANHONG ET AL.: "Multi-channel Switching Power Supply Design Based on PWM Controller NCP1200", ELECTRONIC COMPONENT & DEVICE APPLICATIONS, vol. 09, no. 07, 31 July 2007 (2007-07-31), pages 21 - 23
Attorney, Agent or Firm:
BEIJING WEIZHENG PATENT AGENCY CO., LTD. (CN)
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