KIEE - The Transactions of the Korean Institute of Electrical Engineers

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The Transactions of the Korean Institute of Electrical Engineers

The Transactions of the Korean Institute of Electrical Engineers

ISO Journal TitleTrans. Korean. Inst. Elect. Eng.

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Title	Pulse-Amplitude-Modulation Full-Bridge Diode-Clamped Three-Level LLC Resonant Converter With Offset Voltage Injection Method
Authors	송민섭(Min-Sup Song) ; 정호성(Hosung Jung) ; 김형철(Hyungchul Kim) ; 김재원(Jaewon Kim) ; 조규정(Gyu-Jung Cho) ; 조환희(Hwan-Hee Cho)
DOI	https://doi.org/10.5370/KIEE.2022.71.9.1342
Page	pp.1342-1350
ISSN	1975-8359
Keywords	Pulse-Amplitude-Modulation; Diode-Clamped; Three-Level; LLC; Offset Voltage Injection; DPWM
Abstract	In this paper, a full-bridge diode-clamped three-level LLC resonant converter with pulse-amplitude-modulation (PAM) suitable for a high-input voltage system has been studied. Unlike the existing frequency sweep converter, the proposed PAM method controls the output voltage by modulating the magnitude of fundamental component of leg voltage input to the resonance tank while fixing the operating frequency at the resonance point. In addition, the PWM switching pattern was easily implemented by applying an offset voltage while reducing the switching loss by using the ±180° discontinuous PWM (DPWM) technique. In this study, the control algorithm and operation characteristics were analyzed in detail, and the feasibility was confirmed through simulation.

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