Power Device Temperature-Balancing Control Method for a Phase-Shift Full-Bridge Converter

Jun-Mo Kim, Jeong Lee, Kyung Ryu and Chung-Yuen Won
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Jun-Mo Kim: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Jeong Lee: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Kyung Ryu: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Chung-Yuen Won: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea

Energies, 2020, vol. 13, issue 7, 1-14

Abstract: In this paper, a switching method is proposed for power device temperature-balancing in a phase-shift full-bridge (PSFB) converter. PSFB is commonly used for applications that require high efficiency, because a zero-voltage switching (ZVS) operation is possible on the primary-side. In PSFB, the circulation current complicates ZVS under a light-load condition, which generates heat. Meanwhile, the heat generated in PSFB creates a temperature deviation between the lagging leg and the leading leg, which shortens the lifetime of the power device, thereby reducing system reliability and efficiency. To solve this problem, previous studies applied a pulse-width modulation (PWM) switching method for light and medium loads, and a phase-shift switching method for the region where ZVS is possible. Although this method has the advantage of easy control, the maximum temperature of the legs of the PSFB increases with medium loads. In this paper, a temperature-balancing algorithm—a temperature-balance control—is proposed to decrease the leg temperature using switching based on position exchanges of the leading leg and lagging leg along with PWM switching. Temperature-balance control minimizes leg temperature deviation under light load conditions. The proposed control method provides a minimum temperature difference between the two legs and high efficiency.

Keywords: Phase-shift full-bridge (PSFB) converter; Zero-voltage switching; Temperature-balance control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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