Design of an Input-Series Flyback Power Supply for Ultra-Wide Input Voltage Range Applications

Abstract

In view of the inconvenient power taking, bulky volume, poor anti-fluctuation capability, high cost and complicated control of ultra-wide input-voltage mine-used power supply, a low cost design scheme of ultra-wide input-voltage power supply based on input-series flyback is proposed. The switching power supply scheme adopts conventional MOSFET to realize the self-adaptability under ultra-wide input-voltage range. In this paper, the circuit structure and working principle of mine-used power supply and the design of multi-channel synchronous pulse drive circuit are introduced in detail, and the feasibility of the circuit design is verified by experimental prototype. The experimental results show that the power supply scheme is not only simple in circuit design and low in cost, but also has the advantages of strong input-voltage adaptability, high conversion efficiency, good voltage sharing effect and the like, which is suitable for mining electrical equipment with multiple input-voltage levels.