我院一台Ｌｉｆｅｐａｋ9除颤监护仪在使用过程中发现只能使用充电池,且无充电指示。打开机箱检查,在电源板上测不到输出电压,而输入电压正常,确定为电源板故障。电路基本原理如下。此电源为开关电源,交流流过插头Ｊ1后,,由ＲＴ1、Ｌ1、Ｃ2、Ｃ3滤波,ＣＲ1整流变成直流电。Ｒ1, A Lifepak9 defibrillator monitor in our hospital found during use that only rechargeable batteries were used and there was no indication of charging. Open the chassis and check that the output voltage is not detected on the power board. The input voltage is normal and the power board is determined to be faulty. The basic circuit principle is as follows. This power supply is a switching power supply. After AC flows through plug J1, it is filtered by RT1, L1, C2, and C3, and CR1 is rectified to become DC. R1,