The interaction between the inverter's high-speed switching and the ground parasitic parameter will cause high-frequency common mode (HFCM) switching oscillation at the terminal of the inverter motor

which will endanger the safety and reliable operation of the system. To solve the problem that resonant-type HF electromagnetic noise is difficult to be suppressed effectively

this paper presents a HFCM switching oscillation method based on anti-resonance matching. By constructing a non-contact anti-resonance matching circuit

the impedance of HFCM resonant band is increased to achieve modal-oriented suppression. Firstly

the equivalent circuit of HFCM switching oscillation is established

and the modal characteristics are analyzed. Then

the modal frequency and damping ratio characteristics are extracted to design the anti-resonance matching circuit. The Particle swarm optimization (PSO) algorithm is used to optimize the electromagnetic parameters of the anti-resonance matching circuit based on the anti-resonance impedance matching characteristics

Finally

the experiments on Si IGBT and SiC MOSFET inverter-fed machine systems are conducted and verified. The experimental results show that the HFCM switching oscillation at machine terminals can be efficiently and modal-oriented suppressed by anti-resonance matching. The resonant peak of the common-mode EMI spectrum is attenuated by 12 dB

and the RMS value of the HFCM oscillation current is reduced by about 61.5%.