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Article

Active EMI Reduction Using Chaotic Modulation in a Buck Converter with Relaxed Output LC Filter

1
Department of Nanoscience and Engineering, Nano Circuit Design Laboratory, Inje University, Gimhae, Gyeongsangnam-do 05834, Korea
2
Department of Electronic, Electrical and Computer Engineering, College of Information and Communication Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16410, Korea
*
Authors to whom correspondence should be addressed.
Electronics 2018, 7(10), 254; https://doi.org/10.3390/electronics7100254
Received: 10 September 2018 / Revised: 15 October 2018 / Accepted: 16 October 2018 / Published: 16 October 2018
(This article belongs to the Special Issue Applications of Power Electronics)
DC-DC buck converters are widely used in portable applications because of their high power efficiency. However, their inherent fast switching releases electromagnetic emissions, making them prominent sources of electromagnetic interference (EMI). This paper proposes a voltage-controlled buck converter that reduces EMI by using a chaotic pulse-width modulation (PWM) technique based on a chaotic triangular ramp generator. The chaotic triangular ramp generator is constructed from a simple on-chip chaotic circuit linked with a symmetrically triangular ramp circuit. The proposed converter can thus operate in the chaotic mode reducing the EMI without requiring any EMI filters. Additionally, using the triangular ramp signal can relax the requirement for a large LC output filter in chaotic mode. The effectiveness of the proposed scheme was experimentally verified with a chaotic triangular ramp generator embedded in a voltage-mode controller buck converter using a 0.18 µm Complementary Metal Oxide Semiconductor (CMOS) process. The measurement results from a prototype showed that the EMI improvement from the proposed scheme is approximately 14.53 dB at the fundamental switching frequency with respect to the standard fixed-frequency PWM reference case. View Full-Text
Keywords: electromagnetic interference; chaotic PWM; DC-DC buck converter; CMOS chaotic circuit; triangular ramp generator; spread-spectrum technique; system in package electromagnetic interference; chaotic PWM; DC-DC buck converter; CMOS chaotic circuit; triangular ramp generator; spread-spectrum technique; system in package
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MDPI and ACS Style

Nguyen, V.H.; Huynh, H.A.; Kim, S.; Song, H. Active EMI Reduction Using Chaotic Modulation in a Buck Converter with Relaxed Output LC Filter. Electronics 2018, 7, 254. https://doi.org/10.3390/electronics7100254

AMA Style

Nguyen VH, Huynh HA, Kim S, Song H. Active EMI Reduction Using Chaotic Modulation in a Buck Converter with Relaxed Output LC Filter. Electronics. 2018; 7(10):254. https://doi.org/10.3390/electronics7100254

Chicago/Turabian Style

Nguyen, Van H., Hai A. Huynh, SoYoung Kim, and Hanjung Song. 2018. "Active EMI Reduction Using Chaotic Modulation in a Buck Converter with Relaxed Output LC Filter" Electronics 7, no. 10: 254. https://doi.org/10.3390/electronics7100254

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