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Overcurrent open-phase detection protection circuit and method and compressor comprising over-current open-phase detection protection circuit

A technology for phase loss detection and circuit protection, applied in emergency protection circuit devices, measuring current/voltage, measuring electrical variables, etc., can solve problems such as excessive number of operational amplifiers and complex circuits, and improve operational reliability and save maintenance Time, the effect of reducing the failure reaction time

Inactive Publication Date: 2020-03-27
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can only detect the overcurrent fault of the U and V phases, and there are too many operational amplifiers, the circuit is complicated, and there is no phase loss detection function.

Method used

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  • Overcurrent open-phase detection protection circuit and method and compressor comprising over-current open-phase detection protection circuit
  • Overcurrent open-phase detection protection circuit and method and compressor comprising over-current open-phase detection protection circuit
  • Overcurrent open-phase detection protection circuit and method and compressor comprising over-current open-phase detection protection circuit

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, an overcurrent phase loss detection and protection circuit.

[0037] as attached figure 1 As shown, an overcurrent phase loss detection and protection circuit of this embodiment includes:

[0038] Current sampling circuit 10: the current sampling circuit 10 is connected to the three-phase current input terminal of the three-phase motor, and is used to collect the three-phase current signal of the three-phase motor, and convert the three-phase current signal into a three-phase voltage signal for output;

[0039] A signal amplifying circuit, the input end of the signal amplifying circuit is connected to the output end of the current sampling circuit 10, which is used to amplify the voltage signal output by the current sampling circuit 10 and output it;

[0040] Clamping circuit 30: the clamping circuit 30 is connected to the output end of the signal amplification circuit, and is used to prevent the overcurrent of the three-phase motor from causing an impact...

Embodiment 2

[0066] Embodiment 2, an overcurrent phase loss detection and protection method.

[0067] as attached image 3 As shown, this embodiment provides an overcurrent phase loss detection and protection method. The overcurrent phase loss detection and protection method is implemented by the overcurrent phase loss detection and protection circuit described in Embodiment 1, including the following steps:

[0068] Obtain the three-phase current signal of the three-phase motor through the voltage acquisition circuit, and convert the three-phase current signal into a three-phase voltage signal;

[0069] The voltage selection circuit 50 selects the phase voltage U with the largest voltage among the three-phase voltage signals MAX output;

[0070] The comparison circuit 60 compares the voltage U MAX and the maximum threshold voltage VCC4 and the minimum threshold voltage VCC5, according to the comparison result, a high-level fault signal is output to the MCU, and the MCU drives the inver...

Embodiment 3

[0077] Embodiment 3, a compressor.

[0078] This embodiment provides a compressor, which includes a three-phase motor and the overcurrent phase loss detection and protection circuit described in Embodiment 1.

[0079] Real-time monitor whether the three-phase power input by the compressor motor is over-current or lack of phase through the over-current and phase-loss detection protection circuit. When an over-current or phase-loss fault occurs, a high-level or low-level fault message will be sent to the MCU. The MCU cuts off the power supply of the three-phase motor according to the fault signal, avoiding the MCU to perform calculations to troubleshoot, reducing the fault reaction time, and greatly improving the operation reliability and safety of the equipment; the maintenance personnel only need to observe the light-emitting diodes of the fault display circuit 70 If the light is on, you can intuitively know the type of fault, saving maintenance time.

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Abstract

The invention discloses an overcurrent open-phase detection protection circuit and method and a compressor comprising the overcurrent open-phase detection protection circuit. The overcurrent open-phase detection protection circuit comprises a current sampling circuit, a voltage selection circuit, a comparison circuit and a fault display circuit. According to the invention, the three-phase currentof the three-phase motor is collected in real time through the current sampling circuit, and whether the three-phase current has an overcurrent or open-phase fault is detected, so that the overcurrentfault and the open-phase fault of the compressor are monitored in real time; when an overcurrent or open-phase fault occurs, high-level or low-level fault information can be sent to the MCU, and theMCU cuts off power supply of the three-phase motor according to a fault signal, so that the MCU is prevented from carrying out operation to eliminate the fault, the fault response time is shortened, and the operation reliability and safety of equipment are greatly improved; maintenance personnel can intuitively know the fault type only by observing the light emitting condition of the light emitting diode of the fault display circuit, so that the maintenance time is saved.

Description

technical field [0001] The invention relates to an overcurrent phase loss detection circuit, in particular to an overcurrent phase loss detection protection circuit, a method and a compressor including the circuit. Background technique [0002] The compressor three-phase current detection circuit is an important part of the compressor control system. The three-phase current is collected by connecting the sampling resistor in series on the bridge arm of the three-phase bridge inverter, so as to realize the protection and control of the compressor. When a three-phase overcurrent fault occurs, if the inverter continues to work, it will pose a great threat to equipment and personal safety. At this time, it is necessary to protect the circuit to stop the inverter. When a phase failure occurs, if the inverter continues to work, it will also pose a threat to equipment and personal safety. [0003] The invention patent with the Chinese patent number CN109655675A discloses a three-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/085H02H7/09G01R19/165G01R29/16
CPCG01R19/165G01R29/16H02H7/0854H02H7/09
Inventor 李好时刘兆斌单成龙朱晓蒙李港褚艳伟
Owner GREE ELECTRIC APPLIANCES INC
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