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Wellsun Intelligence has obtained a patent for a dual transistor flyback switching power supply with clamp protection, solving the problem of high voltage on the second switching transistor in the switching power supply

Article Source：China National Intellectual Property Administration | Author：Financial Sector | Issuing Time：2024.04.08
On April 8, 2024, the financial sector reported that, according to the announcement of the China National Intellectual Property Administration, Zhejiang Wellsun Intelligent Technology Co., Ltd. had obtained a patent entitled "a dual tube flyback switching power supply with clamp protection", with authorization announcement No. CN110138229B and application date of June 2019.



The patent abstract shows that the present invention discloses a dual transistor flyback switching power supply with clamp protection, comprising: a first switch transistor, a second switch transistor, a switch transistor protection circuit, a clamp protection circuit, a resistor, a voltage regulator diode, a control circuit, a high-frequency transformer, an absorption circuit, an output rectification and filtering circuit; The first switch tube is connected in series with the second switch tube, and the second switch tube follows the first switch tube for synchronous conduction or cutoff. A switch tube protection circuit is connected in parallel at both ends of the second switch tube, which is used to limit the voltage between the drain and source of the second switch tube within a safe working voltage range during the conduction process of the second switch tube from cutoff to conduction after the first switch tube is turned on. The aim is to solve the problem that damage may occur during the conduction process of the second switch tube following the first switch tube after the first switch tube is turned on, due to the high voltage it bears.
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