US 12,395,069 B2
Power supply system, soft-start circuit, and control method
Weiping Song, Shenzhen (CN); Jinlong Wang, Dongguan (CN); Zhongshu Zhang, Chengdu (CN); and Ling Liu, Hangzhou (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on May 17, 2023, as Appl. No. 18/318,815.
Application 18/318,815 is a continuation of application No. PCT/CN2021/103594, filed on Jun. 30, 2021.
Claims priority of application No. 202011293892.0 (CN), filed on Nov. 18, 2020.
Prior Publication US 2023/0291307 A1, Sep. 14, 2023
Int. Cl. H02M 1/36 (2007.01); H02M 1/00 (2006.01); H02M 1/08 (2006.01)
CPC H02M 1/36 (2013.01) [H02M 1/0058 (2021.05); H02M 1/08 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A power supply system, comprising a semiconductor switch device, a resistor, a controller, a bus capacitor, an auxiliary power supply, and a power conversion circuit, wherein the auxiliary power supply is configured to supply power to the controller;
a first end of the bus capacitor is connected to a first end of a power supply, and a second end of the bus capacitor is connected to a second end of the semiconductor switch device; and a first end of the semiconductor switch device is connected to a second end of the power supply;
a first input end of the power conversion circuit is connected to the first end of the bus capacitor, and a second input end of the power conversion circuit is connected to the second end of the bus capacitor;
two ends of the resistor are separately connected to the first end and the second end of the semiconductor switch device; and when the semiconductor switch device is switched off, the power supply supplies power to the bus capacitor by using the resistor;
when a voltage of the bus capacitor is greater than a first preset voltage, the auxiliary power supply is powered on and the semiconductor switch device is switched off; and
the controller controls the semiconductor switch device to be switched on when the voltage of the bus capacitor is greater than a second preset voltage, wherein the second preset voltage is greater than the first preset voltage; and after the semiconductor switch device is switched on, the power supply supplies power to the bus capacitor by using the semiconductor switch device.