Soft-Switching DC/DC Converter With a Full ZVS Range and Reduced Output Filter for High-Voltage Applications

Abstract

A new soft-switching dc/dc converter, which can solve the drawbacks of existing phase-shifted full-bridge converters such as narrow zero-voltage-switching (ZVS) range, large circulating current, large duty-cycle loss, and a large output filter in highvoltage applications, is proposed in this paper. The proposed converter is composed of two symmetric half-bridge inverters that are placed in parallel on the primary side and are driven in a phase-shifting manner to regulate the output voltage. At the rectifier stage, two full-bridge rectifiers sharing two low-current-rating diodes are employed. This structure allows the proposed converter to have the advantages of a full ZVS range, no problems related to duty-cycle loss, no circulating current, and a significantly reduced output filter. In this paper, the circuit configuration, operation principle, and relevant analysis results of the proposed converters are presented. Experimental results on a prototype converter realized with the specification of 80-in plasma display panel sustain power module (320-385 V d c input, 205 V d c /5 A output) validate the theoretical analysis.

A Dual Half-Bridge Converter with Adaptive Energy Storage to Achieve ZVS over Full Range of Operation Conditions

“…The output voltage is regulated by adjusting the phase-shift time 0.5DT s between leading-HBI and lagging-HBI. The operating sequence during each switching period can be divided into two half cycles-t 0 -t 8 and t 8 -t 15 . Due to the symmetrical structure, only the first half Energies 2017, 10, 444 3 of 10 cycle is given.…”

“…The ZVS operation is achieved over a wide converters result in high secondary-voltage stress and increase the ripple of output voltage. The dual half-bridge converters are a novel solution to extend the ZVS range and remove circulating current [15][16][17]. However, these converters require the specified leakage and magnetizing inductances, which makes the design of transformers complex.…”

A novel ZVS full-bridge converter

“…A number of research papers have been published in literature to improve the range of ZVS operation for converter [3][4][5][6]. The range of ZVS can be extended by increasing stored energy of inductance using high leakage inductance of transformer or adding series inductance.…”

Asymmetrical Pulse-Width-Modulated Full-Bridge Secondary Dual Resonance DC-DC Converter

“…Given the resonance between transformer leakage inductance and parasitic junction capacitance of a rectifier diode, serious voltage spikes across the diode rectifier are generated [3], which increases the diode voltage rating and causes electromagnetic interference problems. Excessive circulating current in the primary side during the freewheeling interval also increases the primary side conduction and turn-off switching losses of the lagging-leg switches [4]- [6]. From the corresponding waveforms of a traditional PSFB converter shown in Fig.…”

“…In order to extend the ZVS range and eliminate voltage spike of diode rectifier, additional auxiliary circuits are required [2], [4]- [6], [8]- [11], [14], which increase complexity of the converter and cause additional conduction losses.…”