Switching power protection circuit and control method thereof
A technology for protecting circuits and switching power supplies, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of increasing resistance power consumption and reducing power supply efficiency, and achieve the effects of reducing line loss, convenient implementation, and good reliability.
Active Publication Date: 2014-07-23
NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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Problems solved by technology
At present, the automatic recovery type overcurrent protection mainly adopts the rated current drooping type overcurrent protection circuit. The overcurrent protection circuit mainly connects the sampling resistor in the output current loop, and then processes the current sampling signal with the overcurrent signal. The disadvantage of this current protection circuit is mainly the existence of the sampling resistor, which reduces the efficiency of the power supply, especially in the case of large current output, the power consumption on the resistor will increase significantly
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[0022] The present invention will be further described below in conjunction with the accompanying drawings.
[0023] Such as figure 1 As shown, a switching power supply protection circuit and its control method are composed of an input filter circuit 1, a power conversion circuit 2, a high frequency transformer 3, an output rectifier circuit 4, an output filter circuit 5, an output feedback control circuit 8, a drive control circuit 7, Composition of overcurrent protection circuit. The overcurrent protection circuit includes a current conditioning circuit 9 and an output current sampling circuit 10; the input filter circuit 1 is connected to the output terminal of the drive control circuit 7 and the input terminal of the high-frequency transformer 3 via the power conversion circuit 2; the input terminal of the drive control circuit 7 The output end of the input filter circuit 1 and the output end of the output feedback control circuit 8 are connected; the output end of the h...
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The invention discloses a switching power protection circuit and a control method thereof. The switching power protection circuit comprises an input filter circuit, a power conversion circuit, a high-frequency transformer, an output rectifying circuit, an output filter circuit, a driving control circuit, an output feedback control circuit and an over-current protection circuit, the output filter circuit comprises an output filter inductor, and the over-current protection circuit comprises a current conditioning circuit and an output current sampling circuit. The output current sampling circuit and the current conditioning circuit are added into the switching power protection circuit, the sampling circuit almost can be free of power loss, a certain condition is created for power efficiency improvement, switching power output efficiency is improved, line loss of the switching power protection circuit is reduced, and interference resistance is high.
Description
[0001] technical field [0002] The invention relates to the field of switching power supply circuits, in particular to a switching power supply protection circuit and a control method thereof. [0003] Background technique [0004] The switching power supply protection circuit is an important part of the switching power supply system. Its function is to protect the power components in the switching power supply and other circuits in the system to work in a safe area when the switching power supply is in the process of system debugging or use. The switching power supply overcurrent protection circuit is one of the core units of the switching power supply protection circuit. When the load on the output terminal of the power supply exceeds the rated load, it will cause damage to the power supply. The overcurrent protection circuit can effectively ensure that the power components of the switching power supply system and the system power supply circuit work in a safe area....
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IPC IPC(8): H02H7/10
Inventor 宋敏燕袁柱六郑东梁寰宇童魁
Owner NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC