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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

Active Publication Date: 2015-04-01
ZHEJIANG HETAIXING CHEM FIBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] If the three-phase motor runs with a lack of phase, it will not work normally, and the motor winding will be burned out soon. Among the damaged three-phase motors, the burnt out motor due to the lack of phase operation accounts for more than half. After the motor burns out, it needs to be replaced. repairs, not only causing economic losses, but also affecting production
[0004] The existing phase loss protection device has the disadvantage that it cannot effectively protect the three-phase motor or has the disadvantage of complex circuit structure

Method used

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  • Open-phase protection circuit composed of voltage comparators

Examples

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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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Abstract

The invention discloses an open-phase protection circuit composed of voltage comparators, and relates to an open-phase protection circuit which includes a power supply circuit, a sampling circuit, a voltage comparator circuit and a control output circuit, wherein the power supply circuit includes a rectifier transformer, a single phase bridge type rectifier circuit, a filter capacitor a, a stabilizing integrated block and a filter capacitor b; the sampling circuit includes a phase line detecting element a, a phase line detecting element b, a phase line detecting element c, a rectifier diode a, a rectifier diode b, a rectifier diode c, a rectifier diode d, a rectifier diode e, a rectifier diode f, a voltage dividing resistor a and a voltage dividing resistor b; the voltage comparator circuit includes a voltage comparator a, a bias resistor a, a bypass resistor a, a voltage comparator b, a bias resistor b and a bypass resistor b; the control output circuit includes a driving resistor, a triode, a clamping diode, a relay, an interlocking control end a and an interlocking control end b. The open-phase protection circuit provides open-phase protection and low-voltage protection effectively for a three-phase motor, and is simple in structure.

Description

technical field [0001] The invention relates to an electronic circuit, in particular to a phase loss protection circuit. Background technique [0002] If the three-phase motor runs with a lack of phase, it will not work normally, and the motor winding will be burned out soon. Among the damaged three-phase motors, the burnt out motor due to the lack of phase operation accounts for more than half. After the motor burns out, it needs to be replaced. Repairs will not only cause economic losses, but also affect production. [0003] In agricultural production, due to the frequent movement of equipment and the influence of the environment, the probability of three-phase motors running without phase is higher, and a protection circuit that can effectively prevent three-phase motors from running without phase is needed. [0004] The existing phase loss protection device has the disadvantage that it cannot effectively protect the three-phase motor or has the disadvantage that the cir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/09
Inventor 吴水仙
Owner ZHEJIANG HETAIXING CHEM FIBER CO LTD
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