Abstract
A phase-shift pulse-width modulation converter is studied and investigated for railway vehicle or solar cell power converter applications with wide voltage operation. For railway vehicle applications, input voltage range of dc converters is requested to have 30–40% voltage variation of the nominal input voltage. The nominal input voltages of dc converters on railway vehicles applications may be 37.5 V, 48 V, 72 V, 96 V and 110 V. Therefore, a new dc converter with wide input voltage operation from 25 to 150 V is presented to withstand different nominal input voltage levels such as 37.5–110 V on railway power units. To realize wide input voltage operation, an auxiliary switch and auxiliary transformer windings are used on output side of conventional full-bridge converter to have different voltage gains under different input voltage values. Phase-shift pulse-width modulation is adopted in the developed dc converter to accomplish soft switching operation on power switches. To confirm and validate the practicability of the presented converter, experiments based on a 300 W prototype were provided in this paper.
Highlights
High efficiency power converters have been developed in renewable energy power conversion.the output voltage of solar panel varies widely and the voltage value is related to solar intensity
Dc converters with wide voltage operation are demanded to convert solar energy to electric power
The dc-dc converters are required on railway vehicles for communication systems, braking systems, electric door systems and solid state lighting systems
Summary
High efficiency power converters have been developed in renewable energy power conversion. Aconversion single-stage dc converter is investigated accomplish therange widerof voltage rangemay A single-stage dc converter is investigated to accomplish the wider voltage range The high For turns-ratio between and an auxiliary switch isswitch used toon achieve wide voltage range operation the low input the secondary-side and primary-side of transformer is employed to generate high voltage gain. The turns-ratio wide voltage range to operation thegain otherunder hand, high the auxiliary switching is off and low transformer is adopted obtain is low in voltage gain undercircuit. Compared to conventional two-stage dc converters, the proposed converter has less power conversion stage and better circuit efficiency.
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