DC110V48V斩波电源..docVIP

（二）SS；型（1^-158号）机车DC110V/48V斩波电源 本斩波电源的结构、电路形式及电路工作原理与110V/15V,24V斩波电源相一致，差别 仅在于少了一路输出及其周围的相应元器件，电路中部分元器件的参数值有所改变。 电源主要技术参数 输入直流电压·······································77-137. 5 V 输出直流电压····························································……48士钾 额定输出直流电流····························································……3A 最大输出直流电流····························································……4A 效率········································································……，＞60％ 保护： 48V输出欠压保护值················································……42-44 V 48V输出过压保护值················································……52^-54 V 110V输入欠压保护值················································……68一70V 110V输入过压保护值························……”·············……140-145 V 辅助电源欠压保护值······················································……约9V 图4-16（见附图册）为110V/48V斩波电源电路原理图，其工作原理可参照第（一）部分 的说明分析。 二、6s．改型机车DC110V八5V、24V、48V斩波电源 本电源按6U标准结构设计，将电路中的所有元器件都设计在一块6U结构的电路板上，底 板大小为(220 X 233. 35)mm2，电源厚度为16R=16X 5. 08=81. 28 mm。本电源具有输入过、欠 压保护、辅助电源欠压保护、各路输出过流及过、欠压保护功能。另外，本电源还具备二次起动 保护功能。其外形见图4-17。 电源主要技术参数 输入直流电压······················································……77-137. 5V 输出直流电压··········································……15士钾，24土钾、48士钾 ·104· 图4-16（见附图册）为110V/48V斩波电源电路原理图，其工作原理可参照第（一）部分 的说明分析。 二、SS．改型机车DC110V八5V、24V、48V斩波电源 本电源按6U标准结构设计，将电路中的所有元器件都设计在一块6U结构的电路板上，底 板大小为(220 X 233. 35)mm2，电源厚度为161=16 X 5. 08= 81. 28～。本电源具有输入过、欠 压保护、辅助电源欠压保护、各路输出过流及过、欠压保护功能。另外，本电源还具备二次起动 保护功能。其外形见图4-17。 电源主要技术参数 输入直流电压······················································……77-137. 5V 输出直流电压·········”·······························……15士钾，24士押、48士押 ·104· 本辅助电源采用RCC式单端反激电路。电源板供电后，110V直流电压经过起动电阻R58 直接给开关管V199的基极供电,V199导通，变压器T213的1、2脚间绕组加上了110V电压。 此时，变压器原边的辅助绕组的同名端5脚感应出正电压，该正电压通过