Abstract
As an effective means of suppressing electromagnetic interference (EMI) noise, the impedance balancing technique has been adopted in the literature. By suppressing the noise source, this technique can theoretically reduce the noise to zero. Nevertheless, its effect is limited in practice and also suffers from noise spikes. Therefore, this paper introduces an accurate frequency modeling method to investigate the attenuation degree of noise source and redesign the impedance selection accordingly in order to improve the noise reduction capability. Based on a conventional boost converter, the common mode (CM) noise model was built by identifying the noise source and propagation paths at first. Then the noise source model was extracted through capturing the switching voltage waveform in time domain and then calculating its Fourier series in frequency domain. After that, the conventional boost converter was modified with the known impedance balancing techniques. This balanced circuit was analyzed with the introduced modeling method, and the equivalent noise source was precisely estimated by combining the noise spectra and impedance information. Furthermore, two optimized schemes with redesigned impedances were proposed to deal with the resonance problem. A hardware circuit was designed and built to experimentally validate the proposed concepts. The experimental results demonstrate the feasibility and effectiveness of the proposed schemes.
Highlights
The switch-mode power supply (SMPS) has played an important role in power generation and conversion systems, which tend to require a higher reliability, a higher power density, and a longer working life
Focusing on the noise attenuation with impedance balancing technique, a frequency domain modeling method and two optimized schemes are introduced in this paper
The accurate noise source model was extracted by capturing the switch voltage waveform and calculating its Fourier series
Summary
The switch-mode power supply (SMPS) has played an important role in power generation and conversion systems, which tend to require a higher reliability, a higher power density, and a longer working life. The controllable switches adopted in SMPS, like metal-oxide-semiconductor field-effect transistors (MOSFETs), insulated gate bipolar transistors (IGBTs) and especially, the newest wide bandgap (WBG) semiconductor switches, may generate violent voltage and current gradients (dv/dt and di/dt). Those gradients bring a serious EMI problem and threaten the normal operation of Electronics 2020, 9, 480; doi:10.3390/electronics9030480 www.mdpi.com/journal/electronics. Plenty of efforts have been made to investigate the generation and propagation mechanisms of the conducted noise Among these investigation approaches, establishing an EMI noise model helps to predict noise spectrum results and adopt appropriate attenuation strategies in the early stage [3,4,5,6,7,8,9,10,11,12,13,14,15]
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