Design of mine-used adaptive wide-voltage power supply with explosion-proof and intrinsic safety

For characteristics that power supplys in coal mine underground has multi input voltage grades and are susceptible to disturbed when big equipments are starting or stopping, the paper put forward a design scheme of adaptive wide-voltage power supply with explosion-proof and intrinsic safety. The power supply uses intelligent phase shift voltage regulating technology and wide-voltage switching power supply technology, and adopts single-chip microcomputer to realize automatic identification of high and low voltage section, automatic switch, intelligent phase shift voltage regulating of 85-825 V wide input voltage, and uses PWM to convert fluctuant voltage to a stable DC voltage. The experiment results show that the scheme solves problems of multi voltage grades and wide-voltage fluctuation of mine-used power supply.