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Motor open-phase protection circuit

A phase failure protection and circuit technology, applied in the electronic field, can solve complex problems and achieve the effects of wide detection range, strong anti-interference ability and high reliability

Inactive Publication Date: 2003-06-11
广州擎天电气控制实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific circuits for realizing current-type phase failure protection have their own strengths and are generally more complicated.

Method used

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  • Motor open-phase protection circuit
  • Motor open-phase protection circuit

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0014] The present invention refers to the attached figure 1 Design and implementation, the detection circuit adopts circuit board type miniature current transformer (through-heart type), model CTY205A, 5A / 2.5mA amplifier A1, A2, A3, A4 model HA17324; power amplifier circuit transistor Q1 model TIP122; relay K1 model OMRON G5V-2 ; The value of resistor R7 is 24KΩ, the value of resistor R8 is 75KΩ; the power supply is DC 24V. After installation and debugging, the circuit action is reliable.

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Abstract

This invention discloses a current phase-failure protection circuit composed of current detection loop, phase failure distinguishing loop, power output loop and power source. Each of three-phase current test loops has a micro current mutual-inductor and the operation amplifier and RC filter afterwards turn the input current to trapezoidal wave and smooth voltage wave-current signal to be sent to distinguish loop. The current signal is "0" for a failure phase and "1" for a current phase. When the phase fails, a comparator compares the partial values of the two signals to send the compared signal to power amplifying loop to output phase-failure protection action signal to cut-off motor input switch.

Description

Technical field: [0001] The invention relates to a current-type phase failure protection circuit, which belongs to the field of electronic technology. Background technique: [0002] There are two types of motor phase failure protection: voltage type and current type. The voltage type uses the negative sequence voltage as the detection signal. When a phase failure occurs, the negative sequence voltage drives the power amplifier to activate the phase failure protection relay. The voltage-type detection unit generally uses a negative-sequence voltage filter composed of RC. Because it is sensitive to frequency, when the power frequency changes or the harmonic component of the power voltage is large, the phase failure protection signal may be sent by mistake. The current type uses three-phase current as the detection signal. Compared with the voltage type, it has high reliability and strong anti-interference ability. The specific circuits for realizing current-type phase failur...

Claims

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Application Information

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IPC IPC(8): H02H7/09
Inventor 竺厥衫梁永万
Owner 广州擎天电气控制实业有限公司
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