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
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[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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