Device for preventing current from flowing backwards
A technology of current backfeeding and circuits, which is applied in the direction of output power conversion devices, conversion equipment with intermediate conversion to AC, electrical components, etc., and can solve problems such as damage to synchronous rectifier tubes, slow response to rapid power failure, etc.
Inactive Publication Date: 2016-02-17
ZTE CORP
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Problems solved by technology
[0004] The purpose of the present invention is to provide a device for preventing current backfeeding, which solves the problem that the input undervoltage protection of switching power supply responds slowly to the input rapid power failure, and the accumulated reverse energy of the inductance has no discharge circuit, thus damaging the synchronous rectifier.
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[0107] 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.
[0108] The present invention aims at the problem that the input undervoltage protection of the switching power supply in the prior art has a slow response to the input rapid power failure, and the accumulated reverse energy of the inductance has no leakage circuit to damage the synchronous rectifier tube, and provides a device for preventing current backfeeding, through the sampling circuit The input voltage of the isolated power supply circuit is sampled in real time, and when the input voltage loses power quickly, it can respond quickly, and the output control signal of the comparison circuit turns off the secondary side synchronous rectification MOS tube of the isolated power supply circuit, which not only prevents the inductor from accumulating reverse...
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The invention provides a device for preventing current from flowing backwards. The device comprises a sampling circuit, a comparison circuit, an isolation circuit and a driving circuit, wherein the sampling circuit is connected with a power input end of an isolation power circuit, the comparison circuit is connected with the sampling circuit, the isolation circuit is connected with the comparison circuit, the driving circuit is connected with the isolation circuit, the sampling circuit is used for sampling a power input voltage of the isolation power circuit in real time and outputting a voltage signal obtained through sampling to the comparison circuit, the isolation power circuit is provided with a plurality of synchronous rectification metal-oxide-semiconductor (MOS) tubes, the comparison circuit is used for comparing the voltage signal with a predetermined reference voltage and outputting a control signal according to a comparison result, the isolation circuit is sued for receiving the control signal of the comparison circuit and transmitting the control signal to the driving circuit, and the driving circuit is used for controlling the switch-on or switch-off of the plurality of synchronous rectification MOS tubes of the isolation power circuit and is further connected with the isolation power circuit. Therefore, reverse current accumulation of an inductor is prevented to cause avalanche breakdown and damage of the MOS tubes.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a device for preventing current backfeeding. Background technique [0002] With the development of technologies such as computers, communications and integrated circuits, the requirements for switching power supplies are getting higher and higher. High power density, small size and high efficiency are the current development trends. In order to achieve the goal of high conversion efficiency, synchronous rectification technology is commonly used in existing switching power supplies, but problems arise accordingly. In a switching power supply, when the input loses power quickly, the output terminal will feed energy back to the input terminal, and a continuously accumulated negative current will be generated on the output inductor. The loop directly charges the parasitic capacitance of the MOS tube of the field effect tube. When the backfill energy is large enough, the MO...
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IPC IPC(8): H02M1/32
CPCH02J1/10H02M3/28
Inventor 宗节保曹青欧阳艳红彭轶黄建华张金涛刘飞云
Owner ZTE CORP