A Full Bridge DC/DC Converter Containing Adjustable Inductance Network

Abstract

The invention provides a full bridge DC-DC converter including an adjustable inductance network. The full bridge DC-DC converter includes a primary side module composed of a single phase full bridge inverter circuit and the adjustable inductance network, a high frequency transformer and a secondary side module including a rectifying circuit. The primary side adjustable inductance network can adjust inductance according to input power, thereby allowing the converter to be always in a soft switching state. Meanwhile the primary side full bridge inverter circuit converts direct current into alternating current and transmits the alternating current to the secondary side module in a coupling manner, and the secondary side module is used for converting the received alternating current into direct current and then applying to loads. According to the full bridge DC-DC converter including the adjustable inductance network, the basic operating mode of the full bridge DC-DC converter is not changed by the usage of the adjustable inductance network, and the advantage that the original converter is simple to control can be maintained.

Description

technical field [0001] The invention relates to a DC-DC converter, specifically a full-bridge DC-DC converter with an adjustable inductance network. Background technique [0002] The full-bridge DC-DC converter can realize the electrical isolation of input and output through its high-frequency transformer on the one hand, and on the other hand, all the switching tubes can realize the soft switching working state under certain conditions, so it has the ability of high transmission efficiency and high power density. High, good security and other advantages. It has been applied in many industrial occasions, such as electric vehicle chargers and aerospace fields. However, the transmission power of the full-bridge DC / DC converter is limited by the equivalent leakage inductance of the transformer. When the transmission power is large, the equivalent leakage inductance of the transformer in the circuit needs to be small, but the small leakage inductance is in the converter. Light...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a full-bridge DC-DC converter with an adjustable inductance network, which solves the problem that the soft switching range of the existing full-bridge DC-DC converter is not large on the one hand, and on the other hand On the one hand, there is no need to change the original converter control strategy, not only can increase the soft switching working range of the converter, but also the converter control method is simple and easy to implement

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