Filter for electric vehicle converting equipment

Abstract

The invention provides a filter for electric vehicle converting equipment, and belongs to the technical field of electric vehicles. The filter is characterized in that the filter comprises a damping filtering unit connected between an input terminal and an output terminal and a resistance-capacitance filtering unit connected between the damping filtering unit and a grounding terminal and used for enabling high-frequency signals to pass. The filter for the electric vehicle converting equipment comprises the damping filtering unit and the resistance-capacitance filtering unit connected between the damping filtering unit and the grounding terminal and used for enabling the high-frequency signals to pass, and the structure is simple; the resistance-capacitance filtering unit is provided so that high-frequency signals can be passed, and the energy loss of a damping resistor is reduced; and the filter for the electric vehicle converting equipment is advantaged by stable performance during practical usage via the simulation of a Bode diagram and a Nyquist diagram and with the combination of stability criterion.

Description

technical field [0001] The utility model relates to a filter for electric vehicle conversion equipment, which belongs to the technical field of electric vehicles. Background technique [0002] Input filter and output filter are important components in switching power supply. At the input end of the switching power supply, the EMI filter can not only suppress the switching peak current from flowing into the power supply, but also prevent the high-frequency interference on the power line from being transmitted to the post-stage converter. Moreover, the input filter of the switching power supply is conducive to improving the electromagnetic compatibility within the system and between systems. The interaction between the input filter and the post-stage converter has certain influence on the system stability. And the output filter can ensure the stable operation of the load and provide a smooth output voltage waveform. [0003] In the prior art, EMI filters are divided accordi...

AI Technical Summary

Problems solved by technology

[0004] Usually, a simple LC low-pass filter can satisfy the low-frequency filtering effect, but because it is an undamped or under-damped system, when it is used as the input filter of the system, it is easy to cause system instability. When it is used as the output filter of the system, it is easy to cause damping oscillation at the output end, and sometimes it will cause serious electromagnetic interference problems

Usually, a low-pass filter is added to the front end of the switching converter to suppress EMI, but adding an input filter will change the transfer function of the system and affect the stability of the subsequent system. Therefore, the impact of the input filter on the system transfer function is studied. work is especially necessary

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