Bidirectional dc-dc conversion circuit

Abstract

The present invention provides a bidirectional DC-DC conversion circuit, including: an interleaved parallel conversion module, a switched capacitor network module, and a first coupling inductor L 1 , the second coupled inductance L 2 , Low-voltage side filter capacitor C L , High voltage side filter capacitor C H , the switching tubes in the interleaved parallel conversion module and the switched capacitor network module are switched between on and off states according to an external control signal, so that the low-voltage side filter capacitor C L on both sides according to the high-voltage side filter capacitor C H The voltage source connected to both ends of the output corresponding low voltage value; or the high voltage side filter capacitor C H on both sides according to the low-voltage side filter capacitor C L The voltage source connected at both ends of the output corresponding high voltage value. The invention can effectively improve the transformation ratio of the conversion circuit, reduce the current stress of the low-voltage side power device and the voltage stress of the high-voltage side power device, improve the efficiency of the converter, and realize high transformation ratio and high-efficiency bidirectional DC-DC conversion .

Description

technical field [0001] The present invention relates to the technical field of power electronics, in particular to a bidirectional direct current to direct current DC-DC conversion circuit. Background technique [0002] Bi-directional DC-DC (Bi-directional DC-DC) conversion circuit is a technology that converts DC power into another form of DC power, mainly for film and current conversion. It is widely used in renewable energy, power system, transportation, aerospace, computer and other control fields. [0003] Taking the application of renewable energy as an example, how to connect these renewable energies to the grid for power generation and transform them into electric energy that users can directly use is the main research direction in the field of distributed power generation. Energy storage devices play a vital role in distributed renewable energy grid-connected power generation systems. In order to solve the voltage level mismatch between the low voltage of energy st...

AI Technical Summary

Problems solved by technology

However, there is a large current impact on each power device during the charging / discharging process of the switched capacitor. In order to solve this problem, a type of step-up switched capacitor resonant converter and a bidirectional resonant converter based on switched capacitors are proposed.

The above schemes can achieve high voltage gain and zero current soft switching, but the huge input current ripple makes these topologies only suitable for low power applications

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