Anti-counterattack interference power supply filter for direct-current system

Abstract

The invention belongs to the field of electromagnetic compatibility, relates to an anti-counterattack interference power supply filter for a direct-current system and aims to effectively suppresses reverse counterattack interference on a direct-current power supply bus by current surge generated in the operation of electrical equipment taking a high-power IGBT element as a core. The filter is mainly applied to a direct-current power supply system of a Dongfeng diesel locomotive, and is used for suppressing counterattack interference on a power supply bus caused by current surge generated during the operation of air conditioner frequency converter equipment connected with the power supply bus of the same direct-current system so as to improve the reliability and safety of other vehicle-mounted electrical equipment in the same direct-current system. The power supply filter provided by the invention comprises a set of full-balance structure pi-type low-frequency filter circuit module mainly used for suppressing electromagnetic interference of low-frequency components, a set of high-frequency filter circuit module which is composed of a full-balance four-order Butterworth low-pass filter circuit and is mainly used for suppressing the electromagnetic interference of medium-high frequency components, and a set of RDC damping absorption circuit module which is designed in a redundantmode and aims at suppressing high-amplitude direct current surge. According to the low-frequency filter circuit module and the high-frequency filter circuit module provided by the invention, the full-balance circuit structure form is adopted, so that surge of counterattack interference can be suppressed when fleeing into a bus from a positive electrode end or a negative electrode end.

Description

technical field [0001] The invention belongs to the field of electromagnetic compatibility, and specifically relates to a DC system anti-backlash interference power filter for effectively suppressing the reverse backlash interference generated by the DC power bus generated by the current surge associated with the operation of electrical equipment with high-power IGBT components as the core. . Background technique [0002] In the same DC power system, as long as there is a high-power IGBT converter in the electrical equipment connected to the power bus, the current surge associated with the switching of the IGBT will cause serious reverse interference to the DC power bus. According to the principle of electromagnetic compatibility, due to counter-interference, from the power input end of the power bus to the IGBT converter input end, the voltage amplitude of the interference wave will gradually increase with the change of the bus position, close to the inverter input end , t...

AI Technical Summary

Problems solved by technology

[0002] In the same DC power system, as long as there is a high-power IGBT converter in the electrical equipment connected to the power bus, the current surge associated with the IGBT switch will cause serious reverse counterattack interference to the DC power bus

Images