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以孔雀KQ47—3机为例,光耦合器用于遥控开机与关机控制,工作原理如下:CPU的(38)脚是电源控制输出端,开机为低电平,关机为高电平。CPU收到关机指令后,(38)脚高电平变成低电平,1BG_(10)导通,c极电位上升,使光耦合器D_(311)中的发光管发光激励D_(311)中的光接收管,使它趋于导通状态。Q_(331)产生b电流而导通,开关电源中的大功率管Q_(311)的b极加反向偏压而停振。开关电源输出为零,完成关机过程。见图1所示。开机时1BG_(10)、D_(311)、Q_(331)和Q_(311)工作状态相反,即完成开机过程。
Taking Peacock KQ47-3 as an example, the optocoupler is used for remote start-up and shutdown control. The working principle is as follows: The CPU’s (38) pin is the power control output terminal. Its power-on is low level and shutdown is high level. After the CPU receives the power-off instruction, the high level of (38) pin goes low, 1BG_ (10) turns on and the potential of c pole rises so that the light emitting diode in the optical coupler D 311 emits light and excites D 311 In the light-receiving tube, making it tend to be on state. Q_ (331) to produce b current conduction, switching power supply in the high-power tube Q_ (311) b plus reverse bias to stop vibration. Switching power supply output is zero, to complete the shutdown process. See Figure 1 below. 1BG_ (10), D_ (311), Q_ (331) and Q_ (311) work in the opposite direction at power-on, that is, the booting process is completed.