论文部分内容阅读
4.开关电源厚膜电路STR—S6709保护电路 (1)Q801(STR—S6709)⑧脚内有“闩锁电路”,它是由三个比较放大器1、2、3和过热保护、过压保护、过流保护以及“或门”电路组成的闸门电路。其中比较放大器1、2是用来控制振荡电路,比较放大器3的输出经“或门”电路控制闩锁电路(即闸门电路或锁存器)(参见10期图1)。开关管在截止时刻产生很高的尖峰脉冲,如果开关管在此尖峰脉冲尚未衰减时开始导通,则有较大的导通损耗。为了减少这种导通损耗,该机采用了“闩锁电路”关断Q801⑤脚输出的驱动脉冲的方法:T862⑨～⑩绕组
4. Switching power supply thick film circuit STR-S6709 protection circuit (1) Q801 (STR-S6709) ⑧ foot “latch circuit”, which is composed of three comparative amplifier 1, 2 and overheat protection, over voltage protection , Over-current protection and “gate” circuit composed of gate circuit. The comparison amplifiers 1 and 2 are used to control the oscillation circuit. The output of the amplifier 3 is compared with the output of the amplifier 3 and the latch circuit (ie, the gate circuit or the latch) is controlled by an OR circuit (see FIG. The switch tube has a very high peak pulse at the cut-off time. If the switch tube starts to conduct when the spike pulse has not been attenuated, the on-state loss is larger. In order to reduce this conduction loss, the machine uses a “latch circuit” method to turn off the drive pulse output Q801 ⑤ pin: T862 ⑨ ~ ⑩ winding