Design of an explosion-proof intelligent charger system for coal mine electric vehicles

doi:10.16265/j.cnki.issn1003-3033.2026.S1.0009

Abstract

Abstract:

In order to meet the requirements for safe and efficient charging of lithium-ion power batteries in explosion-proof underground environments, an explosion-proof intelligent charger system was designed. The main circuit employed a high-frequency silicon carbide (SiC) single-phase H-bridge inverter, an ultrafine crystalline iron core high-frequency transformer, and a fast rectifier bridge to form a multi-stage isolated alternating current-direct current-alternating current 1-alternating current 2-direct current (AC-DC-AC₁-AC₂-DC) converter topology. Centered on the TMS320F28335 digital signal processor (DSP), the system adopted a CC-CV double closed-loop proportional-integral (PI) control algorithm for adaptive operation across multiple input voltage modes, wide-range DC output, and automatic compatibility with various battery pack specifications. The results show that the system achieved a smooth, non-impact transition from CC to CV charging, with overall energy conversion efficiency exceeding 94%, output voltage regulation error less than ±0.5%, and output ripple coefficient below 1%, implementing reliable protection functions. All performance indicators meet the requirements for underground coal mine applications.

Key words: coal mine electric vehicle, explosion-proof intelligent charger, constant current-constant voltage (CC-CV), double closed-loop control, high-frequency transformer

CLC Number:

X946

Gao Wencai, Sun Deyu, Liu Jianyu, Zhang Quanzhu. Design of an explosion-proof intelligent charger system for coal mine electric vehicles[J]. China Safety Science Journal, 2026, 36(S1): 55-60.

Figures/Tables 11

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