Comments on Common-Mode Noise Reduction by Parasitics Capacitance Cancellation in the Three-Phase Inverter

This article comments on the published article titled Common-mode noise reduction by parasitics capacitance cancellation in the three-phase inverter authored by Zhang and Wu (2019). The three-terminal electromagnetic interference (EMI) filter can effectively suppress the EMI noise on the output side in the paper. The numerical analysis and the relationship of converting negative inductance into capacitance at high frequency are discussed in detail. Zhang and Wu (2019) presented a parasitic capacitance cancellation method to reduce the conducted emissions exiting a three-phase inverter. The idea of parasitic capacitance cancellation is not novel, and Wang and Lee (2007, 2010) originally applied it to reduce the common mode noise exiting a boost PFC converter. The parasitic capacitance cancellation of inductors is discussed in papers by Neugebauer and Perreault (2006) and Piboonwattanakit and Khan-Ngern (2008). These papers should be cited in the introduction and the references.

Automated summary

This article comments on a published paper by Zhang and Wu (2019) on the topic of common-mode noise reduction by parasitic capacitance cancellation in a three-phase inverter. The paper demonstrates how a three-terminal electromagnetic interference (EMI) filter can effectively reduce EMI noise on the output side. The concept of parasitic capacitance cancellation is not new, and previous works by Wang and Lee (2007, 2010), Neugebauer and Perreault (2006), and Piboonwattanakit and Khan-Ngern (2008) should be cited.