Bidirectional isolation DC-DC converter

Abstract

The present disclosure discloses a bidirectional isolated DC-DC converter, which comprises two ports, two voltage and current isolated acquisition units, a processing module, two filtering-circuit units, and a bidirectional power-converting module. One of the two ports is selectively used as an input terminal of the bidirectional isolated DC-DC converter, and another of the two ports is used as an output terminal. The two voltage and current isolated acquisition units are connected with the two ports respectively to sample voltages and currents at the two ports and generate corresponding feedback signals. The processing module receives the feedback signals and outputs corresponding control signals according to the feedback signals. The bidirectional power-converting module is connected via the two voltage and current isolated acquisition units to the two ports to perform the conversion of different voltages between the two ports according to the control signals output by the processing module.

Description

technical field [0001] The invention relates to a voltage conversion device, in particular to a bidirectional isolated DC-DC converter suitable for new energy vehicles and energy storage systems. Background technique [0002] In the high-voltage battery pack of new energy vehicles and energy storage systems, in order to ensure that the battery system has sufficient charge and discharge energy and prolong the service life of the battery pack, it is necessary to effectively balance each battery cell connected in series in the high-voltage battery pack. Most of the existing equalization technologies use resistance discharge to achieve passive discharge equalization, which is a one-way energy-consuming equalization method, not only the equalization current is small (it has high requirements for the consistency of the battery itself) , and also cause heat problems. [0003] At present, two-way isolated DC-DC converter devices are mainly used in solar energy storage control syste...

AI Technical Summary

Problems solved by technology

However, the above-mentioned bidirectional DC / DC converter is only suitable for charging and discharging the battery cells in the high-voltage battery pack, and it can only realize constant current on one side, but not bidirectional constant current.

In addition, when a high transformation ratio is required, the above-mentioned bidirectional DC / DC converter needs to adopt a two-stage boost mode, which is easy to introduce electromagnetic compatibility problems, and its structure and control are also relatively complicated. When performing DC / DC conversion, high Frequency signals are likely to cause interference to the functional control unit and affect the reliability of the entire system

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