Be used for electronic equipment to input under -voltagely and overflow detection circuitry

The utility model provides a be used for electronic equipment to input under -voltagely and overflow detection circuitry, when input voltage fluctuation is great, protection electronic equipment. The technical solution of the household electrical appliance time switch control system is characterized in tha, including resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R14, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, thyristor U2, thyristor U3, potentiometre RV1, comparator U1, comparator U2, logic disjunction gate U5, diode D1, relay RL1 and electronic equipment M. The utility model discloses simple structure, used components and parts are few, and are with low costs, appear under -voltagely or during the circumstances about overflowing when voltage, logical disjunction gate U5 output high level, the diode D1 switch on, and re