A Complementary Active Clamp Soft-Switching Push-Pull Converter and Its Modulation Method

Abstract

The invention provides a complementary active clamp soft switch push-pull converter and a modulation method thereof. The solution includes a first push-pull active switch tube, a second push-pull active switch tube, a clamp capacitor, a high-frequency transformer, a rectifier circuit, an input DC capacitor, and an output DC capacitor; wherein, the rectifier circuit includes a first controllable switch, a second controllable switch, a third controllable switch, and a fourth controllable switch; the first push-pull active switch tube includes a first end and a second end, and the second push-pull active switch tube It includes a third terminal and a fourth terminal; the clamp capacitor is between the first push-pull active switch tube and the second push-pull active switch tube. In this scheme, two push-pull active switching tubes work symmetrically and alternately to form soft switching characteristics, and a clamping capacitor is used to form a clamping circuit to solve the leakage inductance peak and the natural commutation of the rectifier diode when the switching tube is turned off, so as to reduce the Converter electromagnetic interference and improve operating efficiency.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, to a complementary active-clamp soft-switching push-pull converter and a modulation method thereof. Background technique [0002] As energy and environmental issues become increasingly prominent, renewable energy and electric vehicles are developing rapidly. DC converters are an important part of renewable energy, energy storage systems, and electric vehicles, and play a key role in improving system performance. At present, DC converters with high power density, low cost, high efficiency and high reliability have gradually become a research hotspot. [0003] In the existing technical solution, the energy stored in the leakage inductance of the push-pull converter will cause a voltage spike when the switch is turned off. In order to absorb this part of the energy, passive and active clamping circuits are used, but the existing clamping circuit The structure of th...

AI Technical Summary

Problems solved by technology

[0003] In the existing technical solution, the energy stored in the leakage inductance of the push-pull converter will cause a voltage spike when the switch is turned off. In order to absorb this part of the energy, passive and active clamping circuits are used, but the existing clamping circuit The structure of the bit circuit topology is complex, and there are high resonance peaks, and the leakage inductance is small. When the switch tube is turned on, the current increases rapidly, and the turn-on loss is large.

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