Frequency converter output short circuit protection circuit and protection method

An output short-circuit and protection circuit technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of imperfect three-phase output short-circuit protection, poor system anti-interference ability, slow dynamic response time, etc., to achieve strong anti-interference ability. , fast response time, good system stability

Active Publication Date: 2013-04-03
GUANGZHOU SANJING ELETRIC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In order to solve the technical problems of imperfect three-phase output short-circuit protection, slow dynamic response time and poor system anti-inter...

Method used

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  • Frequency converter output short circuit protection circuit and protection method
  • Frequency converter output short circuit protection circuit and protection method
  • Frequency converter output short circuit protection circuit and protection method

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Embodiment

[0032] like figure 1 As shown, the inverter output short-circuit protection circuit of the present invention includes a current detection module, a current operational amplifier processing module, an anti-interference processing module and a PWM control block output module connected in sequence, wherein the current detection module is used to detect the motor controlled by the inverter. UVW three-phase current, after the detected three-phase current is amplified by the current operational amplifier processing module, it is input into the anti-interference processing module for comparison to obtain the output short-circuit signal F0, and the PWM control blockade output module blocks the three phases of the motor according to the short-circuit signal F0. The driving signals of the phase six tubes are the output signals of PWM1-PWM6; preferably, the current detection module in this embodiment is a milliohm resistance current detection module.

[0033] like figure 2 As shown, th...

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Abstract

The invention discloses a frequency converter output short circuit protection circuit and a protection method thereof. The protection circuit comprises a current detecting module, a current operational amplifier processing module, an anti-jamming processing module and a PWM (pulse width modulation) control lockout output module, wherein the current detecting module is used for detecting UVW three-phase current of a motor, the current operational amplifier processing module is used for amplifying the detected UVW three-phase current to obtain an amplifying signal, the anti-jamming processing module is used for comparing the amplifying signal with a reference signal to obtain an output short circuit signal, and the PWM control lockout output module is used for locking out a driving signal of the motor according to the short circuit signal. The frequency converter output short circuit protection circuit and the protection method effectively solve the technical problems of imperfect three-phase output short circuit protection, slow dynamic response and poor anti-jamming capability of a system.

Description

technical field [0001] The invention relates to a short-circuit protection circuit, and more particularly, to an output short-circuit protection circuit and a protection method of a frequency converter. Background technique [0002] In the daily motor control process, the frequency converter plays an important role. During the use of the motor, due to human wiring errors, serious damage to the winding insulation due to motor aging, and electromagnetic interference of control signals, it is easy to cause a short-circuit fault at the output of the inverter. The short-circuit instantaneous current is very large, which exceeds the normal working current range of the IGBT tube. If the PWM output of the inverter cannot be turned off in a timely and effective manner within the specified time, it will cause the IGBT tube to burn out due to short-circuit and overcurrent. [0003] In order to improve the use safety of the inverter, the inverter generally has a short-circuit protectio...

Claims

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Application Information

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IPC IPC(8): H02H7/12
Inventor 黎志维明居政陈宇华
Owner GUANGZHOU SANJING ELETRIC
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