Isolated direct current (DC) bidirectional converter

Abstract

The invention discloses an isolated direct current (DC) bidirectional converter which comprises a DSP (Digital Signal Processor), a first MOS (Metal-Oxide Semiconductor) transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a fifth MOS transistor, a sixth MOS transistor, a transformer, an isolation driving unit, an isolation unit, an inductor and an electrolytic capacitor, wherein the transformer comprises a primary winding and two secondary windings; when energy flows to a low-voltage terminal from a high-voltage terminal, the DSP drives the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor to carry out full-bridge conversion by virtue of the isolation driving unit and drives the fifth MOS transistor and the sixth MOS transistor to carry out synchronous rectification; and when the energy flows to the high-voltage terminal from the low-voltage terminal, the DSP drives the fifth MOS transistor and the sixth MOS transistor to carry out push-pull conversion and drives the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor to carry out synchronous rectification. The isolated DC bidirectional converter is especially suitable for the bidirectional conversion from a low current at the high-voltage terminal to a high current at the low-voltage terminal.

Description

[technical field] [0001] The invention relates to the technical field of power conversion, in particular to an isolated DC bidirectional converter. [Background technique] [0002] In new energy applications, due to the instability of the input terminal, batteries or supercapacitors are usually used for energy storage. In this case, a bidirectional converter is required. In the case where the voltage difference between the two sides of the bidirectional converter is very large, such as more than ten times, the efficiency of the non-isolated converter mode is low, which is very uneconomical. Especially in some cases, due to safety reasons, isolation is also required , so an isolated bidirectional converter is required in this case. [0003] In high-power applications with low output voltage, there is no complete solution for which mode to use; the current bidirectional converters have their own advantages and disadvantages, but one side is high-voltage and low-current, and th...

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Problems solved by technology

[0003] In high-power applications with low output voltage, there is no complete solution for which mode to use; the current bidirectional converters have their own advantages and disadvantages, but one side is high-voltage and low-current, and the other side is low-voltage and large-scale. Current applications are not suitable, especially in some new energy applications, where constant current charging or constant current discharge is required on the low voltage side, these bidirectional converters that currently exist are not suitable

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