A control method and device for a synchronous rectification self-driving circuit
A technology of synchronous rectification and control method, which is applied in the direction of output power conversion devices, electrical components, high-efficiency power electronic conversion, etc., and can solve the problems of inability to flexibly adjust the switching time of synchronous switching tubes, broken tubes, and drive misfires, etc.
Active Publication Date: 2021-05-28
ZTE CORP
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Problems solved by technology
[0003] However, in this way, due to the delay of the drive circuit, etc., after the current flowing through the synchronous switch tube is reduced to 0, the drive is still issued, and the current backflow occurs, causing the synchronous switch tube to explode; In the case of short circuit, output load state switching, external interference, etc., there may be mis-delivery of the drive, causing the upper and lower tubes of the synchronous switching tube to go straight to the explosive tube; the switching time of the synchronous switching tube cannot be flexibly adjusted, which will affect the output indicators such as peak-to-peak value, constant weight noise of the phone etc. have a great impact
[0004] It can be seen that the existing synchronous rectification self-driven control method, due to its own limitations, cannot cope with the application of some special circumstances, and the tube explosion will also affect the output index of the synchronous rectification circuit
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[0058] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.
[0059]The present invention aims at the problem that the existing synchronous rectification self-driving control method cannot cope with the application in some special cases due to its own limitations, and the tube explosion will also affect the output index of the synchronous rectification circuit, and provides a synchronous rectification self-driving control method. The control method of the driving circuit will improve the reliability of the synchronous rectification self-driving circuit and optimize the output index of the synchronous rectification circuit through the cooperative control of the auxiliary control signal.
[0060] Such as figure 1 As shown, a control method of a synchronous rectification self-driving circuit according to an embodiment...
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The invention provides a control method and device for a synchronous rectification self-driving circuit, and relates to the field of power electronics. The method includes: acquiring a driving signal of a transformer primary switching tube in a synchronous rectification circuit to which the synchronous switching tube belongs; generating an auxiliary control signal for adjusting the self-driving time of the synchronous switching tube according to the driving signal of the transformer primary switching tube; Generating a target control signal of the synchronous switching tube according to the auxiliary control signal and the self-driving control signal of the synchronous switching tube; controlling the driving of the synchronous switching tube according to the target control signal. The solution of the present invention solves the problem that the existing synchronous rectification self-driven control method cannot cope with the application in some special cases due to its own limitations, and the tube explosion occurs, which will also affect the output index of the synchronous rectification circuit.
Description
technical field [0001] The invention relates to the field of power electronics, in particular to a control method and device for a synchronous rectification self-driving circuit. Background technique [0002] In a traditional synchronous rectification self-driven circuit, the synchronous switching tubes are often directly controlled by the driving signals generated by their respective driving circuits to realize the normal operation of the synchronous switching tubes. [0003] However, in this way, due to the delay of the drive circuit, etc., after the current flowing through the synchronous switch tube is reduced to 0, the drive is still issued, and the current backflow occurs, causing the synchronous switch tube to explode; In the case of short circuit, output load state switching, external interference, etc., there may be mis-delivery of the drive, causing the upper and lower tubes of the synchronous switching tube to go straight to the explosive tube; the switching time ...
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IPC IPC(8): H02M1/08H02M1/38
CPCH02M1/08H02M1/38H02M3/335Y02B70/10
Inventor 涂大锐杨运东郑大成王明金吴琼
Owner ZTE CORP