A Circuit for Improving Anti-interference Capability of Overcurrent Protection

Abstract

The invention discloses a circuit for improving the anti-jamming capability of overcurrent protection, which comprises a three-phase current output current signal, a current signal anti-jamming circuit, a precision rectification absolute value circuit, a proportional integral circuit, an over-current comparison circuit, and an over-current signal anti-jamming circuit circuit and a DSP processing circuit, the three-phase current output current signal is connected to the precision rectification absolute value circuit through the current signal anti-interference circuit, the precision rectification absolute value circuit is connected to the proportional integral circuit, and the proportional integral circuit is compared with the overcurrent The circuit is connected, the over-current comparison circuit is connected with the over-current signal anti-interference circuit, and the over-current signal anti-interference circuit is connected with the DSP processing circuit. The circuit for improving the anti-interference ability of overcurrent protection provided by the invention can not only perform overcurrent protection quickly and effectively, but also has extremely strong anti-electromagnetic interference ability.

Description

technical field [0001] The invention belongs to the field of frequency converters, and in particular designs a circuit for improving the anti-interference ability of overcurrent protection. Background technique [0002] Interference has always been an important issue that must be considered in the design and use of frequency converters and related electronic and electrical systems. In the working environment of the frequency converter system, there are a large number of electromagnetic signals, such as the fluctuation of the power grid, the start and stop of high-voltage equipment, the electromagnetic radiation of high-voltage equipment and switches, etc. When they generate electromagnetic induction and interference impact in the system, they are often It will disturb the normal operation of the system, the light one will cause the system to be unstable and reduce the accuracy of the system; the severe one will cause the control system to crash or malfunction, resulting in e...

AI Technical Summary

Problems solved by technology

In the working environment of the inverter system, there are a large number of electromagnetic signals, such as the fluctuation of the power grid, the start and stop of high-voltage equipment, the electromagnetic radiation of high-voltage equipment and switches, etc. When they generate electromagnetic induction and interference impact in the system, they are often It will disturb the normal operation of the system, the light one will cause the instability of the system and reduce the accuracy of the system; the severe one will cause the control system to crash or malfunction, resulting in equipment damage or personal injury or death

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