四、开关电源电路工作原理与检修彩色电视机均采用开关稳压电源,核心部件是开关管,由于它工作在开关状态(当其导通时处于饱和导通状态,管压降接近于0,当其截止时,通过的电流接近于0),导通截止转换速度又很快,所以效率高、功耗小、滤波电容容量也小。目前,开关稳压电源电路形式较多,按开关管与负载的连接方式分为二种:一种是开关管串接在输入电路与负载电路之间称为串联型开关 Fourth, the switching power supply circuit works and maintenance Color TV switching power supply are used, the core component is the switch, because it is working in the switch state (when it is turned on in a saturated conduction state, the tube pressure drop close to 0, When its deadline, the current through the close to 0), turn-off cut-off speed and fast, so high efficiency, low power consumption, the filter capacitor capacity is small. Currently, there are many forms of switching power supply circuits, which are divided into two types according to the connection mode of the switch tube and the load: one is that the switch tube is connected in series between the input circuit and the load circuit and is called a series switch