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IS215ACLEH1A燃机模块
当其中一个输入相位脱落时Q108的传导周期缩短，电容器C129开始充电。在三个线路频率周期后，C129充电充足，导致Q109传导，从而有效地使驱动电路接地，防止产生进一步的SCR门脉冲，从而关闭装置的输出。当交流输入降到工作范围以下时，交流断开电路可防止电源工作。该电路的工作原理如下：C128将通过R149开始放电。这将导致Q107开始将点火线接地至SCR，并重置“软启动”电路。一旦输入功率达到工作水平，“软启动”电路将按以下方式复位：电容器C134通过Q110的基极缓慢开始充电。随着C134充电，基极电流将减小，从而使Q110的集电极电压缓慢上升，从而逐渐增加SCR的导通角。为电压和电流通道提供单独的恒流参考。Q111的集电极电流驱动电压通道，Q112驱动电流通道。这些电流源由温度补偿齐纳二极管CR133两端的电压参考。由于IC104引脚1和2的求和结上的电压差基本上为零，CR133上的电压也出现在R167和R168的串联组合上（由于Q111和Q112的Vbe基本上是恒定电流，所以R171和R173也是如此）。通过固定电阻的恒定电压产生恒定的集电极电流。R167和R171可将每个电源的电流调节为1 mA。
电压通道流的参考电流水平从J107-2到TB3-3。
端子TB3-3、4和5之间有跳线，当电流流过电压控制R13时产生的电压电平被施加到IC104的引脚8。IC104引脚9的其他输入上的信号来自通过分压器R177加上R178和R179的电源输出电压电平。IC104的针脚9处的最大额定输出电压产生+5Vdc。当R13处于完全顺时针位置时，+5Vdc施加在IC104的引脚8上。如果衰减输出电压与R13设置的值不同（例如，由于负载变化），IC104引脚10的输出端将产生错误信号。该错误信号通过SCR控制电路，将导致输出电压成比例变化，从而使IC104引脚9上的电压等于施加在引脚8上的电压。电流通道的作用与电压通道的作用相同，但受控量通过分流器R12进行采样除外。该采样电压与IC104引脚6上产生的参考电压相比较，由前面板电流控制R14建立。（0至100毫伏直流电）。电压通道放大器和电流通道放大器的输出由二极管CR136和CR139“存储”在一起。无论哪个通道具有较高的正输出信号，都会覆盖另一个通道的影响，成为控制直流输出的通道。电压或电流通道的输出馈送至晶体管Q110的底座，晶体管Q110作为线性放大器工作，其输出馈送到相位控制电路Q101-106。
When one of the input phases drops out
the conduction cycle of Q108 is reduced, allowing capacitor C129 to start charging. After three cycles of line frequency, C129 charges sufficiently to cause Q109 to conduct which effectively grounds the drive circuit preventing the generation of further SCR gate pulses which shuts down the output of the unit. The AC dropout circuit prevents the power supply from operating when the AC input drops below operating range. This circuit works as follows: C128 will start discharging through R149. This will cause Q107 to start conducting grounding the firing line to the SCRs and resets the "soft start" circuit. Once input power is at the operating level, the "soft start" circuit will reset in the following manner: Capacitor C134 slowly starts charging through the base of Q110. As C134 charges, the base current will decrease allowing the collector voltage of Q110 to slowly rise which gradually increases the conduction angle of the SCR's. Separate constant current references are provided for the voltage and current channels. The collector current of Q111 drives the voltage channel and Q112 the current channel. These current sources are referenced by the voltage across CR133, a temperature-compensated zener diode. Since the voltage difference across the summing junction of IC104 pins 1 and 2 is essentially zero, the voltage across CR133 also appears across the series combination of R167 and R168 (also R171 and R173 since the Vbe of Q111 and Q112 is essentially constant current). A constant voltage across a fixed resistance produces a constant collector current. The current from each of these sources is adjustable to 1 mA by R167 and R171.
The reference current level for the voltage channel flows
from J107-2 to TB3-3. With jumpers between terminals TB3-3, 4 and 5, the voltage level produced when this current flows through the VOLTAGE control R13 is applied to pin 8 of IC104. The signal on the other input of IC104 pin 9 is derived from the power supply output voltage level through voltage divider R177 plus R178 and R179. Maximum rated output voltage produces +5Vdc at pin 9 of IC104. With R13 in the fully clockwise position, +5Vdc is applied to pin 8 of IC104. If attenuated output voltage changes from the value set by R13 (because of load changes, for example) an error signal will be developed at the output of IC104, pin 10. This error signal, via the SCR control circuitry, will cause a proportional change in the output voltage so as to bring the voltage on pin 9 of IC104 equal to that applied to pin 8. The action of the current channel is identical to that of the voltage channel with the exception that the controlled quantity is being sampled across the shunt R12. This sampled voltage is compared to the reference voltage produced at pin 6 of IC104, which is established from the front panel current control R14. (0 to 100 millivolts DC).The output of the voltage channel amplifier and the current channel amplifier are "ored" together by diodes CR136 and CR139. Whichever channel has a higher positive output signal overrides the effect of the other and becomes the channel controlling the DC output. The output of either the voltage or current channel is fed to the base of transistor Q110 which operates as a linear amplifier whose output is fed to the phase control circuit Q101-106.
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