Design of Synchronous Rectification Buck Stabilized Power Supply Based on TL494
This paper designs a synchronous rectifier Buck regulated power supply based on TL494.By controlling the PWM duty ratio at the end of the single-chip microcomputer,the design converts the PWM signal into the DC voltage sig-nal through the LPF filter,so that the PWM signal generated by the TL494 controls the duty ratio of the synchronous rectifi-er tube,and realizes the stable and continuous adjustable output of voltage from 0 to 30 V.The output sampling circuit amplifies the current value and sends it to the MCU and TL494.When the current exceeds 5 A,the MOS tube turns off to realize overcurrent protection.In addition,the prototype of the circuit schematic diagram is made and tested.The experi-mental measurement shows that the load adjustment rate is less than 1%,the output ripple is less than 50 mV,and the ef-ficiency is higher than 96%,which meets the basic requirements of NC.
万方数据
维普
