A Filter Design Method

Abstract

The invention provides a filter design method, which is suitable for suppressing the electromagnetic interference of high-voltage DC power supply in the motor controller of new energy vehicles. Voltage size, limit requirements and space size, etc., rationally adjust the structure and component parameters of the filter, so that the filter can better match the needs of the motor controller; the air-core inductor is used as the inductance component of the filter in the design, compared with The conventional magnetic core structure reduces the loss of the inductor when it is working, and avoids the saturation problem of the magnetic core when the current is high; the combination of the differential mode inductor and the common mode capacitor is used as the basic circuit of the filter, making the turning point of the differential common mode filter circuit The frequency points are consistent, and there is no need to design the differential common mode separately, which simplifies the design process of the filter.

Description

technical field [0001] The invention relates to the technical field of electromagnetic interference (EMI) filtering, in particular to a filter design method for electromagnetic interference of a high-voltage DC power supply in a motor controller of a new energy vehicle. Background technique [0002] At present, as a key component of a new energy vehicle, the motor controller generally uses power semiconductor devices (such as IGBT, etc.) for pulse width modulation (PWM) control to realize the adjustment of the output three-phase voltage of the motor controller. The rapid on-off of power semiconductor devices produces high current change rate di / dt and voltage change rate du / dt, which will generate undesirable electromagnetic noise, which will not only affect the radio receiving equipment inside and outside the car, but also affect other equipment through high-voltage power lines. Vehicle high and low voltage components. In addition, the electromagnetic noise generated by th...

AI Technical Summary

Problems solved by technology

However, although the engineering test method is currently the most widely used method in EMC processing, due to its lack of filter design theory, it takes repeated rounds of tests to determine the filter topology and parameters, and the rectification period is long and the cost is high; based on Although the design method of the filter corner frequency has a basis for the theory, it also needs to cooperate with the process of conducted interference test and debugging calculation, which is also relatively complicated.

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