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3、中点电压偏移检测保护电路中点电压偏移检测保护电路见图 2 -1 7所示 :该电路主要有以双向可控硅 SR2为主中点电压检测电路和以 SR1为主的电源控制电路这两部分电路构成。其主要元件由双向可控硅 SR1、SR2、继电器 JD1 ,电阻 R1 4 8、R2 48、 R5、 R6、 R7,电容 E5、E6等组
3, the midpoint voltage offset detection protection circuit midpoint voltage offset detection and protection circuit shown in Figure 2 -1 7 shows: the circuit is mainly based on the triac SR2 midpoint voltage detection circuit and SR1-based Power control circuit composed of two parts of the circuit. Its main components from the triac SR1, SR2, relays JD1, resistors R1 4 8, R2 48, R5, R6, R7, capacitors E5, E6 and other groups