论文部分内容阅读
表5给出了IC4和Q9、Q10在线实测电压值。4.过压与过流保护电路由于12V电压主要用于彩电的信号处理电路,24V电压主要用于背光灯供电的逆变器,两者的负载电流是独立变化的,两者之一或同时可能发生过压现象,故过压保护必须独立实施。若是12V过压,此时稳压二极管ZDS4击穿,二极管DSl0导通;若是24V过压,此时稳压二极管ZDS5击穿,二极管DS9导通。因为它们都使“自锁双稳态”的QS2基极获得触发电压而翻转,由截止至导通状态,从而实现了过压保护。12V或24V的过流保护也是分别独立进行的,但线路结构是相同的。下面以24V的过流保护过
Table 5 shows the IC4 and Q9, Q10 online measured voltage value. 4. Over-voltage and over-current protection circuit 12V voltage is mainly used for color TV signal processing circuit, 24V voltage is mainly used for backlight-powered inverter, the load current is independent of the two changes, either or both Overvoltage may occur, so over-voltage protection must be implemented independently. If the 12V overvoltage, then the zener diode ZDS4 breakdown, the diode DSl0 conduction; if 24V overvoltage, then the zener diode ZDS5 breakdown, the diode DS9 conduction. Because they all make the “self-locking bistable ” QS2 base to obtain the trigger voltage and flip, from the end to the conduction state, in order to achieve over-voltage protection. Over-current protection of 12V or 24V is also carried out independently, but the line structure is the same. Below to 24V over-current protection