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AWINIC has obtained a patent for the soft start control circuit of switching power supplies, solving the problem of abnormal soft start of switching power supplies

Article Source：China National Intellectual Property Administration | Author：Financial Sector | Issuing Time：2024.05.06
On May 4, 2024, the financial sector reported that, according to the announcement of the China National Intellectual Property Administration, Shanghai AWINIC Electronic Technology Co., Ltd. has obtained a patent entitled "Soft start control circuit of a switching power supply and switching power supply", with authorization announcement No. CN108809071B, and application date of August 2018.

The patent abstract shows that the present invention provides a soft start control circuit for a switching power supply, comprising a clock frequency generator for generating a frequency signal with a small duty cycle; The output end of the clock frequency generator is connected to the control end of the first switch module; The input end of the first switch module is connected to the power supply end, and the output end is connected to the end with high capacitance potential of the soft start control circuit; Among them, the common terminal of the first switch module and the capacitor is also used to connect the in-phase input terminal of the first comparator of the soft start control circuit. The present invention also provides a switching power supply, comprising the main components of a soft start control circuit, an error amplifier, a pulse width modulation comparator, and a switching transistor driving unit. The present invention uses uA level current to charge the delay capacitor at a certain duty cycle, solving the problem of abnormal soft start of switching power supplies. At the same time, the capacitance value of the delay capacitor is reduced, the internal space of the chip is saved, and the cost of the chip is reduced.



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