28 W/cm&lt;sup&gt;3&lt;/sup&gt; high power density three-port DC/DC converter cell for dual-voltage 12-V/48-V HEV subsystem

Wei

et al. 2022

In this paper, some novel converters are proposed to solve the drawbacks of traditional phase-shifted full-bridge (PSFB) converter. In the primary side of proposed converters, the FB inverter is divided into two half-bridge inverters and the large-sized transformer is replaced by two small-sized transformers. By employing this structure, the zero voltage switching range can be extended and the primary circulating current existing in the additional PSFB converter is removed. In the secondary side, various rectifiers can be adopted to suit for different applications. Moreover, the primary power can be continuously transferred to secondary side in the proposed converters, which contributes to the reduction of output filter requirement. The circuit configuration, operational principle and relevant analysis of proposed converters are introduced in this paper. Experimental results on two typical prototype converters are built to validate the theoretical analysis.

Section: Introductionmentioning

confidence: 99%

Analysis of novel phase-shifted full-bridge converters with wide ZVS range reduced filter requirement

Cai

Wei

et al. 2022

“…Moreover, galvanic isolation is required to ensure safety. The phase-shifted full-bridge (PSFB) converter is one of the most popular isolated power supplies for high power applications since all primary switches can achieve zero-voltage switching (ZVS) without the help of any auxiliary circuits [5][6][7][8]. However, the traditional PSFB converter has some serious drawbacks [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

High efficiency isolated power supply used for hybrid DC circuit breaker in high voltage direct current systems

Yao

Song

et al. 2022

Hybrid DC circuit breaker is one of the most equipment in high voltage direct current (HVDC) systems. It includes numbers of power electronic (PE) devices and high efficiency isolated power supply is required to control these PE devices. The phase-shifted fullbridge (PSFB) converter is a popular topology for isolated power supply. However, the traditional PSFB converter has some well-known drawbacks. To solve these drawbacks, a novel ZVS FB converter is proposed in this paper. In the primary side of proposed converter, four FB switches, two main transformers and one shared capacitor constitute two half-bridge inverters. At the rectified stage, two FB rectifiers are connected in series by sharing diodes. This structure allows the proposed converter to achieve wide zero-voltage switching range and reduced filter requirement, which make the proposed converter well suited for the power supply for hybrid DC circuit breaker. The performances of proposed converter are verified with an experimental prototype.

“…In the traditional phase-shifted full-bridge (PSFB) converter, all the primary switches can achieve zero voltage switching (ZVS) operation by using the parasitic components. Hence, the circuit structure is very simple and high switching frequency can be employed without causing large switching loss, which is beneficial for the improvement of reliability and power density [1,2,3,4,5,6]. The PSFB converter is widely adopted for isolated applications, such as renewable power system, server power supply unit and battery charger.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of dual-half bridge converter operating in discontinuous conduction mode

Chen

Wei

et al. 2020

Dual-half bridge (DHB) converter is a novel family of phaseshifted full-bridge (PSFB) converter, and it can obtain a significant improvement in conversion efficiency compared to the traditional PSFB converter. However, the main drawback of DHB converter is that only the energy stored in leakage inductor can be used to discharge the junction capacitors of switches. All switches tend to lose zero-voltage switching (ZVS) under light load conditions, which will significantly degrade efficiency. This paper proposes a simple and effective method to extend the ZVS range of DHB converter. By making the DHB converter operating in discontinuous conduction mode (DCM) and widening the dead-time, the energy stored in the magnetizing inductors of transformers can be used to discharge the junction capacitors. Without additional auxiliary components, the ZVS operation under light load conditions can be obtained. Experimental results confirm the validity of proposed method.