Abstract
A dc/dc pulse width modulation (PWM) circuit was investigated to realize the functions of reduced primary current loss and balanced voltage and current distribution. In the presented dc/dc converter, two full bridge pulse width modulation circuits were used with the series/parallel connection on the high-voltage/low-voltage side. The flying capacitor was adopted on the input side to achieve voltage balance on input split capacitors. The magnetic coupling element was employed to achieve current sharing between two parallel circuits. A capacitor-diode passive circuit was adopted to lessen the primary current at the commutated interval. The phase-shifted duty cycle control approach was employed to regulate load voltage and implement soft switching characteristics of power metal-oxide-semiconductor field-effect transistors (MOSFETs). Finally, the experimental results using a 1.68 kW prototype converter were obtained to confirm the performance and feasibility of the studied circuit topology.
Highlights
High power density/efficiency dc/dc converters [1,2] have been proposed to reduce unnecessary power loss in order to reduce environmental pollution and met global energy demands
High-voltage pulse width modulation (PWM) converters have been presented for industry power units [3,4], dc micro-grid systems [5,6,7] and dc traction or dc light rail transportation systems [8,9]
Full bridge circuits with a high switching frequency high-voltage rating SiC metal-oxide-semiconductor field-effect transistors (MOSFETs) or high-voltage rating insulated gate bipolar transistor (IGBT) devices can be adopted for high dc voltage applications
Summary
High power density/efficiency dc/dc converters [1,2] have been proposed to reduce unnecessary power loss in order to reduce environmental pollution and met global energy demands. High-voltage pulse width modulation (PWM) converters have been presented for industry power units [3,4], dc micro-grid systems [5,6,7] and dc traction or dc light rail transportation systems [8,9]. For these applications, the dc bus voltage is regulated between 750 V and 800 V. A series/parallel-connected dc/dc converter is proposed to accomplish reduced primary circulating current, a soft switching operation, and balanced input voltages and output currents.
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