彩色电视机开关稳压电源的模块化读图教学

Modularization Teaching of Circuit Diagram Reading of Switch Power of Color TV

开关电源的读图关键是了解电路的组成及各部分的工作原理。模块化教学是将电路以功能的不同进行分块教学。对于自激式开关电源,自激振荡就是一个正反馈的过程,稳压控制的实质是通过控制开关管的开关时间实现输出电压的稳定,保护电路有过压保护电路和过流保护电路,是通过电压取样和电流取样及保险电阻完成的,直流待机电路的方式有控制市电输入、控制开关管和控制行扫描电路,此外还有交流关机电路。

The key of circuit diagram reading of switch power is understanding the composition of the circuit and the principle of each parts. Modularization teaching is a tnethod that classifies the circuit into different parts according to the function. For self-oscillation switch power,self oscillation is a positive feedback pro cess, Voltage- stabilization circuit is realized by controlling the switch time of the switch transistor. Protection circuit which contain over high voltage protection and over-big current protection is achieved by voltage sampling ,current sampling and resistance--fuse. DC stand-by circuit includes input supply controlling, switch transistor controlling and horizon scan circuit controlling. Also,there is AC power off circuit.