Design of adjustable voltage power supply based on buck

Abstract

To meet the supply voltage of some Marine equipment related performance test, the power supply is designed with wide threshold adjustable value. In DC-DC transformation, Buck circuit is a common step-down topology. The adjustable voltage power supply system is composed of Buck synchronous rectification circuit, drive circuit, power supply circuit, voltage sampling circuit, current sampling circuit, control circuit, and so on. STM32F407 of STMicroelectronics is used as the main control chip to provide PWM for the driving switch device MOS. The voltage feedback circuit is used to calibrate the output voltage to ensure the accuracy of the output voltage.