一种矿用开关电源设计

摘要

For problems of existing mine-used switching power supply such as large harmonic current,low power factor and so on,a mine-used switching power supply was designed by use of technologies of active power factor correction and resonant soft switching.Design indexes of the power supply were introduced as well as design scheme of its hardware circuits.The test results show that under conditions of inputting AC170 V and outputting full load,the inputting current of the power supply has no pulse and little harmonic current;the max temperature of main components of the power supply is 98.5 ℃ when environmental temperature is 50 ℃;when input voltage is AC90 ～ 265 V,power factor of the power supply is not less than 0.96,ripple voltage is less than 30 mV,and efficiency is 86.5％;in test of insulation withstand voltage,insulation resistance is not less than 50 MΩ,and leakage current is less than 1 mA.%针对现有矿用开关电源存在的谐波电流较大、功率因数较低等问题,采用主动功率因数校正与谐振软开关电源技术设计了一种矿用开关电源,介绍了该电源的设计指标及硬件电路设计方案.试验结果表明:在170 V交流输入且输出满载条件下,矿用开关电源输入电流未出现脉冲状,谐波电流小;50℃环境温度下,电源主要器件的最大温度为98.5℃;在输入电压为AC90～265 V时,电源功率因数不小于0.96,纹波电压小于30 mV,电源效率达86.5％;绝缘耐压试验中绝缘电阻不小于50 MΩ,漏电流低于1 mA.