24 V/200 W switching power supply based on UC3844

SHI Xu-dong， XV Jun-ming
（Institute of Electron Device & Application， Hangzhou Dianzi University， Hangzhou 310018， China）

Abstract： Aiming at the power supplying problems of the high-power devices under mine，and in order to improve its stability and reliability，the double-ended forward switching power supply was investigated. After the analysis of relevant feasibility，the deficiencies of the linear power and traditional switching power supply were pointed out，the design method of double-ended forward switching power supply based on UC3844 was established. After the analysis of the circuit schematic，some special functions such as over overcurrent protection and over voltage protection were added to the circuit. The power supply was tested in the bad environment，the data and waveform were evaluated for many times. The experimental results indicate that the power supply can meet the national institute of standards and design requirements with the advantages of good stability，small ripple and high efficiency.
Key words： switching power；double-ended forward；UC3844；overcurrent protection；small ripple