Abstract
This paper studies and implements a power converter to have less current ripple output and wide voltage input operation. A three-leg converter with different primary turns is presented on its high-voltage side to extend the input voltage range. The current doubler rectification circuit is adopted on the output side to have low current ripple capability. From the switching states of the three-leg converter, the presented circuit has two equivalent sub-circuits under different input voltage ranges (Vin = 120–270 V or 270–600 V). The general phase-shift pulse-width modulation is employed to control the presented converter so that power devices can be turned on at zero voltage in order to reduce switching loss. Compared to two-stage circuit topologies with a wide voltage input operation, the presented converter has the benefits of simple circuit structure, easy control algorithm using a general integrated circuit or digital controller, and less components. The performance of the presented circuit is confirmed and validated by an 800 W laboratory prototype.
Highlights
Operation and Zero-VoltageFor the past decade, clean energy sources have brought attention to the depletion of fossil fuel demand due to the rising demand for electric power
The turn-on time of the power switch is related to input voltage under the constantly switching frequency
The output voltage of PV panels and wind generators is variable in a wide voltage range
Summary
Clean energy sources have brought attention to the depletion of fossil fuel demand due to the rising demand for electric power. The output voltage variation of some dc wind power and PV panels may be greater than 4 To overcome this problem, dc converters with a cascaded structure [13,14,15]. The dc converters with duty cycle control were studied in [16,17,18] to achieve wide voltage operation and low switching loss. Full-bridge converters with wide input voltage range that have PWM or PFM schemes have been presented in [19,20]. A three-leg structure phase-shift PWM converter is studied and implemented to have a wide voltage input operation and a wide load range of zero-voltage turn-on operation. Two sub-circuits with different voltage gains can be operated in the presented converter according to input voltage ranges. The effectiveness and benefits of the presented circuit are verified by theoretical analysis and experimental verifications with an 800 W prototype
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