Preceding stage DC converter for proton exchange membrane fuel cell and construction method thereof

Abstract

The invention provides a preceding stage DC converter for a proton exchange membrane fuel cell and a construction method thereof. The preceding stage DC converter comprises a full-bridge phase shift unit, a high-frequency transformer, a full-bridge rectification unit and an output side filtering unit. The full-bridge phase shift unit comprises four switch tubes, each bridge arm is provided with two switch tubes which are in complementary conduction, each switch tube is connected with a diode in parallel in the reverse direction and is connected with a capacitor in parallel at the same time, and a syntonic inductor and a blocking capacitor are connected in series and then are coupled between any bridge arm and the high-frequency transformer. The high-frequency transformer is coupled between the full-bridge phase shift unit and the full-bridge rectification unit, and is used for carrying out boosting adjustment. The full-bridge rectification unit is used for converting input AC signals into DC signals. The output side filtering unit comprises a filtering inductor and a filtering capacitor, the filtering inductor and the filtering capacitor are connected in series and then are coupled to the full-bridge rectification unit, and the output side filtering unit is used for filtering output DC voltages and then providing the filtered DC voltages to a backward stage inverter. According to the preceding stage DC converter for the proton exchange membrane fuel cell and the construction method thereof, phase shift angles are adjusted in real time through voltage and current double closed loop control according to boosting needs, and the stability of output voltages is maintained.

Description

technical field [0001] The present invention relates to the technical field of proton exchange membrane fuel cell design, in particular to a pre-stage step-up DC converter based on voltage-type full-bridge phase-shifting zero-voltage soft switching and its construction method for the power generation characteristics of proton exchange membrane fuel cells . Background technique [0002] A fuel cell is a clean and efficient distributed power source that converts the chemical energy of hydrogen-containing fuel directly into electrical energy without a combustion process under the action of a catalyst. Proton exchange membrane fuel cell (PEMFC for short), as the most likely commercialized fuel cell, has the advantages of low operating temperature, high current density, and fast response, and has broad application prospects. PEMFC is a complex electrochemical system, which adjusts the flow and pressure of reaction gas in real time according to the load power requirements. When t...

AI Technical Summary

Problems solved by technology

Most of the existing fuel cell DC boost modules use non-isolated Boost topology, but there are safety issues in non-isolated

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