Voltage doubling high frequency rectifying isolated converter based on hybrid rectifying bridge arm

Abstract

The invention discloses a voltage doubling high frequency rectifying isolated converter based on a hybrid rectifying bridge arm, and belongs to the technical field of power electronic converters. The voltage doubling high frequency rectifying isolated converter based on the hybrid rectifying bridge arm is composed of a primary side circuit, a transformer and a rectifying circuit. The rectifying circuit is composed of two diodes, two switching pipes, two auxiliary capacitors, two output filter capacitors, a high-frequency inductor and a load. By means of the high-frequency inductor and the switching pipes, the rectifying circuit has the controllable boosting and rectifying capacity; by means of an embedded voltage doubling rectifying circuit composed of the auxiliary capacitors and by means of a voltage doubling output circuit composed of the two output filter capacitors, the boosting capacity of the rectifying circuit is improved. The boosting function of the high-frequency inductor is achieved in the rectifying circuit, soft switch-on and soft switch-off of all the switching pipes and the diodes are achieved, on-off losses can be effectively reduced, efficiency can be improved, and the voltage doubling high frequency rectifying isolated converter is particularly suitable for places with efficient and high-gain isolated boosting direct current power conversion.

Description

technical field [0001] The invention relates to a double-voltage, high-gain, high-frequency rectification and isolation converter, which belongs to the technical field of power electronic converters, in particular to the technical field of isolated DC-DC power conversion. Background technique [0002] In applications in technical fields such as renewable energy power generation, aviation, aerospace, automobiles, and medical care, isolated boost DC converters are usually required for safety reasons and to meet voltage requirements. How to increase the voltage gain of the isolated converter, reduce the voltage stress of the devices used in the converter, and realize high-efficiency power conversion has always been a key issue in this technical field. [0003] The traditional isolated DC converter realizes various boosting functions by adjusting the transformation ratio of the transformer. However, the following problems exist in simply relying on adjusting the transformation r...

AI Technical Summary

Problems solved by technology

[0003] The traditional isolated DC converter realizes various boosting functions by adjusting the transformation ratio of the transformer. However, the following problems exist in simply relying on adjusting the transformation ratio of the transformer to realize the voltage boost: the voltage stress of the switching device is high, especially the converter secondary The voltage stress of the side rectifier diode is much higher than the output voltage; the leakage inductance of the transformer increases, causing voltage spikes and oscillations of the switching device, further aggravating the stress of the switching device, reducing reliability and efficiency

The main problem of this solution is that the rectifier circuit and non-isolated boost circuit on the secondary side of the transformer are all hard switches, and two-stage power conversion is required from input to output, which will greatly reduce the overall efficiency of the converter.

Images