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富士达FR-940卫星接收机在社会上有一定拥有量。该机故障中约有30％出在开关电源部分。该机开关电源电路是笔者根据实物测绘出来的,如下页图所示。本文分析这一开关电源电路,以求对读者维修时有所帮助。 该开关电源属脉冲变压器并联型自激式开关电源,稳压性能好,有完善的过压保护功能。 1.自激振荡过程 220V交流市电经继电器常闭触点J1-1、电网滤波电路C1、B1、C2后,由桥式整流电路D16～D19整流,R1、C3滤波,得到约300V平滑的直流
Fujitsu FR-940 satellite receiver in the community have a certain amount. About 30% of the machine failure in the switching power supply section. The machine switching power supply circuit is based on the physical mapping out, as shown in the following page. This paper analyzes the switching power supply circuit, in order to help readers repair. The switching power supply is a pulse transformer parallel self-excited switching power supply, regulator performance, and improve the over-voltage protection. 1. Self-oscillation process 220V AC power through the relay normally closed contact J1-1, grid filter circuit C1, B1, C2, by the bridge rectifier D16 ~ D19 rectifier, R1, C3 filter, get about 300V smooth DC