DC-DC converter device of hydrogen fuel cell and current control method thereof

Abstract

The invention relates to the technical field of DC-DC converters, in particular to a DC-DC converter device of a hydrogen fuel cell and a current control method thereof. According to the DC-DC converter device, a branch current acquisition module is responsible for acquiring real-time current of each phase branch and transmitting the real-time current to a DSP controller module; the branch currentacquisition module, a first voltage and current sampling and short circuit monitoring module and a second voltage and current sampling and short circuit monitoring module are electrically connected with the input end of the DSP controller module; the output end of the DSP controller module is electrically connected with the input end of an energy storage element and he input end of a power isolation switch tube module through an isolation switch tube driving module; and the first voltage and current sampling and short circuit monitoring module and the second current sampling and short circuitmonitoring module are respectively responsible for acquiring input end voltage and current and output end voltage and current and also responsible for monitoring input end current and output end current in real time so as to realize rapid response to the situation of overcurrent or short circuit of a circuit and rapid transmission of warning signals to the DSP controller module.

Description

technical field [0001] The invention relates to the technical field of DC-DC converters, in particular to a hydrogen fuel cell DC-DC converter device and a current control method. Background technique [0002] With the increasingly serious problems of environmental pollution and energy crisis, hydrogen fuel cell vehicles have gradually become a research hotspot in the field of new energy vehicles. Due to the slow dynamic response and soft characteristics of hydrogen fuel cells, and the large range of voltage changes, they cannot better meet the needs of the entire vehicle. Usually, a DC / DC converter is required to achieve the purpose of voltage decoupling and power control. [0003] Hydrogen fuel cell vehicles have extremely high requirements on parameters such as volume power density and conversion efficiency of hydrogen fuel cell DC-DC converters. In order to increase the volume power density, we often use multi-phase interleaved parallel technology to increase the rated ...

AI Technical Summary

Problems solved by technology

In practical applications, it is difficult to achieve complete consistency between the power devices of each branch in a multi-phase interleaved parallel circuit, and it is also difficult for the heat dissipation system to evenly dissipate heat from each branch.

In view of the above problems, traditional hydrogen fuel cell DC-DC converters often use current sharing technology to achieve thermal balance of multi-phase interleaved parallel circuits as much as possible. There is a problem of large temperature difference in each branch, which leads to problems such as early derating of the converter, poor performance of over-temperature protection, and even low reliability problems such as equipment damage, which affects the performance of the hydrogen fuel cell DC-DC converter. Safety and stability further affect the economy and practicability of new energy vehicles

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