Bidirectional DC/DC power conversion device

Abstract

The invention discloses a bidirectional DC / DC power conversion device comprises a first inverter / rectifier unit, an LLC resonant unit, a second rectifier / inverter unit and a controller. The first inverter / rectifier unit, the LLC resonant unit and the second rectifier / inverter unit are connected. The controller is connected with the control end of the first inverter / rectifier unit and the control end of the second rectifier / inverter unit. The controller is used for respectively controlling the first inverter / rectifier unit and the second rectifier / inverter unit, so that the DC / DC power conversion device is controlled to perform the forward or reverse conversion on the electric power. The ZVS conduction can be realized. The buck-boost ratio of direct-current power conversion can be improved.The technical problems that a low-voltage large current is difficult to design, the power conversion efficiency is low, the size is large, the cost is high and the like are solved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a bidirectional DC / DC power conversion device. Background technique [0002] With the continuous development of green renewable energy, battery formation and capacity sharing, and electric vehicles, more and more efficient bidirectional isolated DC converters and their control strategies are required to achieve bidirectional energy flow. Existing bidirectional isolated DC / DC power conversion devices generally adopt a hard-switching structure, which reduces the overall efficiency of the power conversion device and limits the operating frequency of the entire circuit, resulting in high cost and large volume. [0003] In the field of battery formation and capacity division, it is necessary to charge and discharge the battery at the same time. The best way is to achieve high-efficiency AC / DC bidirectional flow, take power from the grid when charging, and feed the grid when...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a bidirectional DC / DC power conversion device, specifically a resonant isolation bidirectional DC / DC power conversion device, which is used to solve the problem of high transformation ratio, low voltage and high current in the isolated bidirectional DC / DC power conversion device in the prior art. , and low power conversion efficiency, large volume, high cost and other technical problems

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