Voltage peak absorption circuit

Abstract

The embodiment of the invention discloses a voltage peak absorption circuit. The circuit comprises a bus peak absorption circuit, an energy feedback circuit, a protection circuit and an energy absorption circuit. The first end of the bus peak absorption circuit is electrically connected with the positive end of the output bus of a rectifier circuit. The second end of the bus peak absorption circuit is electrically connected with the negative end of the output bus of the rectifier circuit. The first end of the energy feedback circuit is electrically connected with the positive end of the outputbus of the rectifier circuit. The second end of the energy feedback circuit is electrically connected with the first end of the protection circuit and is electrically connected with the third end ofthe bus peak absorption circuit. The third end of the energy feedback circuit is electrically connected with the second end of the protection circuit. The first end of the energy absorption circuit iselectrically connected with the positive end of the output bus of the rectifier circuit. The second end of the energy absorption circuit is electrically connected with the negative end of the outputbus of the rectifier circuit. The third end of the energy absorption circuit is electrically connected with the third end of the energy feedback circuit. According to the invention, the voltage peak absorption circuit disclosed by the embodiment of the invention is simple in structure, high in absorption efficiency, high in reliability and the like. The voltage peak absorption circuit is suitablefor the voltage peak absorption of the secondary rectifier tube of a high-power-density circuit.

Description

technical field [0001] Embodiments of the present invention relate to the field of switching power supplies, in particular to a voltage spike absorbing circuit. Background technique [0002] With the development of power electronics technology, switching power supplies are tending to be miniaturized and lightweight. In order to reduce the size and weight of the power supply, the switching frequency can be increased. However, with the increase of the switching frequency, the switching loss is also increasing, which brings about the problems of reduced efficiency and serious heat generation. At the same time, due to the high-frequency operation, the influence of parasitic parameters such as leakage inductance and distributed capacitance of the switching transformer cannot be ignored. At the moment of switching transition, the energy charging and discharging of the reactance element causes the power device to bear a lot of heat and electrical stress, and forms an overvoltage....

AI Technical Summary

Problems solved by technology

This not only means that designers must choose expensive high-voltage power switch tubes, but also poses a potential threat to the reliability of the power supply. Therefore, it is necessary to set up various snubber absorption circuits to suppress it.

[0003] At present, there are many kinds of voltage spike absorbing circuits that can achieve the purpose of buffering and absorbing, but the current designed voltage spike absorbing circuits often require multiple controls and more magnetic components, the structure is complex, and the reliability, size, and efficiency of the product are all there. influences

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