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五、电路原理分析1.开关电源(1)信号流程交流220V电源接通后,电压通过EM(I电磁干扰)滤波器进入桥式整流器BDIF整流,经C11F电解电容滤波后,变为300V左右的直流电。在开关电源控制集成电路(OB2269CP)的控制下,其⑧脚输出频率为65kHz、宽度可调整的驱动脉冲,驱动功率开关管Q3F通断,在高频变压器的次级产生的输出,经过与次级相连的整
V. CIRCUIT ANALYSIS A. Switching Power Supply (1) Signal Flow After AC 220V power supply is turned on, the voltage will be rectified by BDIF into the bridge rectifier through EM (I electromagnetic interference) filter. After being filtered by C11F electrolytic capacitor, the voltage will become 300V DC. In the switching power supply control integrated circuit (OB2269CP) under the control of its ⑧ pin output frequency of 65kHz, width adjustable drive pulse, the drive power switch Q3F off, the output of the secondary transformer in high-frequency transformers, Connected whole level