Novel high-power switching power supply surge current suppression circuit
A high-power switching and inrush current technology, which is applied in emergency protection circuit devices for limiting overcurrent/overvoltage, DC power input conversion to DC power output, circuit devices, etc., can solve the problem of affecting efficiency and affecting power supply temperature and other issues to achieve the effect of improving component temperature, improving power supply efficiency, and reducing input loss
Inactive Publication Date: 2021-05-07
东莞市盈聚电源有限公司
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[0003] The purpose of the present invention is to provide a new type of high-power switching power supply surge current suppression circuit to solve the problem that the input surge current of the switching power supply not only affects the efficiency but also affects the temperature of the power supply in the above background technology
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[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0020] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation indicated by rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present in...
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The invention relates to the technical field of switching circuits, and in particular relates to a novel high-power switching power supply surge current suppression circuit which comprises an EMC circuit, a rectifier bridge, a surge current control circuit, a large capacitor, an LLC control circuit, a transformer, a secondary side rectification filter circuit and an output voltage feedback circuit. The input end of the rectifier bridge is connected with the output end of the EMC circuit, the input end of the surge current control circuit is connected with the output end of the rectifier bridge, the output end of the surge current control circuit is connected with the large capacitor, the output end of the large capacitor is connected with the LLC control circuit and the transformer, the input end of the LLC control circuit is further connected with the output end of the output voltage feedback circuit, and the surge current control circuit comprises an NTC, an MOS tube Q1, a resistor R46 and a voltage stabilizing diode ZD1. The circuit has the advantages of improving the power supply efficiency and the power supply temperature, is very practical, can reduce the input loss of a switching power supply, and also can improve the temperature of input part elements.
Description
technical field [0001] The invention relates to the technical field of switching circuits, in particular to a novel high-power switching power supply surge current suppression circuit. Background technique [0002] The input surge current of switching power supply has always been a difficult problem for R&D personnel, especially for high-power switching power supply. At present, the most effective countermeasure is to add high-power NTC at the input end to solve it, but this will affect the overall efficiency of switching power supply , For example, add a 5 ohm 12A NTC to a 200W switching power supply. When 100Vac is input, assuming that the temperature of the NTC body is 100 degrees, then the resistance of the NTC is about 0.6 ohms. The calculated input current is 2A, and the power consumption is 1.2W. , this has always existed, not only affects the efficiency, but also affects the temperature of the power supply. The electrical working principle of the traditional surge s...
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IPC IPC(8): H02M1/32H02H9/02H02M3/335
CPCH02H9/026H02M1/32H02M3/33569
Inventor 闫照勇赵军张昱
Owner 东莞市盈聚电源有限公司