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海信iTV-2911型互动彩电电源采用KA3S0880RFB开关控制电路,它具有工作频率宽150kHz、工作稳定特点,内部设有:振荡、同步、过流、过压、过热保护。外接元件少,便于维修,电路见图1所示。一、工作原理 1.振荡电路:交流220V经净化高频电流后经硅堆D802整流、C806滤波后得到300V电压,经开关变压器T801①～④绕组后加至开关控制电路N801
Hisense iTV-2911 interactive color TV power supply using KA3S0880RFB switch control circuit, which has a wide operating frequency 150kHz, stable work characteristics, the internal features: oscillation, synchronization, over current, over voltage, overheat protection. External components, easy to repair, the circuit shown in Figure 1. First, the working principle 1. Oscillating circuit: AC 220V purified high-frequency current through the silicon stack D802 rectifier, C806 filter to get 300V voltage, the switch transformer T801 ① ~ ④ winding added to the switch control circuit N801