Circuit for increasing over-current protection anti-interference capability

Abstract

The invention discloses a circuit for increasing an over-current protection anti-interference capability. The circuit comprises a three-phase current output current signal, a current signal anti-interference circuit, a precision rectification absolute value circuit, a proportion integral circuit, an over-current comparison circuit, an over-current signal anti-interference 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 proportion integral circuit. The proportion integral circuit is connected to the over-current comparison circuit. The over-current comparison circuitis connected to the over-current signal anti-interference circuit. The over-current signal anti-interference circuit is connected to the DSP processing circuit. By using the circuit for increasing the over-current protection anti-interference capability, over-current protection can be rapidly and effectively performed and an anti-electromagnetic-interference capability is good.

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

Images