Isolation type active clamping interleaving paralleled bidirectional DC-DC converter

Abstract

The invention discloses an isolation type active clamping interleaving paralleled bidirectional DC-DC converter which comprises four power switch tubes with anti-parallel diodes and parallel capacitors, two auxiliary switch tubes with anti-parallel diodes, two clamping capacitors, two high voltage side capacitors and two winding coupled inductors. The invention utilizes a low voltage side parallel structure to reduce ripples of a low voltage side current, utilizes the parallel capacitors of the power switch tubes to realize zero voltage turn-off of the power switch tubes, utilizes the leakage inductance of the coupled inductors to realize zero voltage switching of the power switch tubes, utilizes the auxiliary switch tubes and an active clamping circuit consisting of the anti-parallel diodes and the clamping capacitors of the auxiliary switch tubes to realize lossless transfer of the leakage inductance energy and utilizes serial structures of high voltage side windings of the two coupled inductors to realize high voltage rising / reduction of the converter. In the invention, a circuit structure is simple, all power switches work in a soft switching state, and an energy loss element does not exist in the circuit, therefore the converter efficiency is enhanced, and voltage overshoot does not occur on a switch device in a current commutating process.

Description

technical field [0001] The invention relates to a bidirectional direct current-direct current converter, in particular to an isolated active clamp interleaved parallel bidirectional direct current-direct current converter. Background technique [0002] In recent years, with the massive consumption of traditional energy such as oil and coal, energy shortage and environmental pollution have become the focus of the world, and the development and application of renewable energy have attracted widespread attention from all over the world. In the renewable energy power generation system, the electric energy generated by renewable energy such as wind energy and solar energy has a short-term fluctuation problem, and an energy storage system is required to make the energy output of the power generation system stable. Among them, the core of the energy storage system is a bidirectional DC-DC converter, which can store excess energy in energy storage devices such as batteries when the ...

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Problems solved by technology

[0008] 3. In this scheme, the forward transformer only transfers energy to the high-voltage side when its corresponding switch tube is turned on, while the flyback transformer only transfers energy to the high-voltage side when its corresponding switch tube is turned off, resulting in low utilization of the transformer , which increases the volume of the transformer and reduces the system power density;

[0009]4. Due to the asymmetry of the forward transformer and the flyback transformer, it is difficult to realize the interleaved parallel operation of the circuit, which affects the improvement of the system power level

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