Open-phase protection circuit composed of voltage comparators
A phase loss protection circuit, voltage comparator technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problems of burning motor windings, economic losses, complexity, etc., to achieve phase loss protection and undervoltage protection, effective Phase loss protection and undervoltage protection, correct and reliable detection and sampling effects
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Embodiment 1
[0016] Example 1 In the embodiment shown in the drawings, a phase loss protection circuit composed of a voltage comparator is composed of a power supply circuit, a sampling circuit, a voltage comparison circuit and a control output circuit, among which, a rectifier transformer (TC), a single-phase bridge The rectifier circuit (VD), the filter capacitor a (C1), the voltage stabilizer integrated block (IC1) and the filter capacitor b (C2) constitute the power circuit; the sampling circuit consists of the phase line detection terminal a (U), the phase line detection terminal b (V ), phase line detection terminal c (W), rectifier diode a (V1), rectifier diode b (V2), rectifier diode c (V3), rectifier diode d (V4), rectifier diode e (V5), rectifier diode f ( V6), limiting diode (V7), voltage dividing resistor a (R1) and voltage dividing resistor b (R2); the voltage comparison circuit includes voltage comparator a (IC2), bias resistor a (R3), bypass resistor a (R4), delay resist...
Embodiment 2
[0017] Example 2 In this implementation, the phase loss protection circuit described in the first embodiment is combined and applied on the intelligent controller of the agricultural greenhouse, wherein the phase loss protection circuit is the same as that of the first embodiment, and will not be repeated here. The intelligent controller of the agricultural greenhouse has the function of room temperature monitoring and soil humidity monitoring. When the temperature in the agricultural greenhouse needs to be raised or the soil needs to be irrigated, the intelligent controller will make the water pump run and open the relevant solenoid valve to pump the groundwater up. Irrigate or use the heat of groundwater to warm up. The water pump is driven by a three-phase motor, the start or stop of the three-phase motor is controlled by a contactor, and the contactor is controlled by an intelligent controller. The three main contacts on the upper end of the contactor are connected to ...
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