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| Digital Control and Implementation of Photovoltaic Soft-Switching DC-DC Converter With High-frequency Step-up Transformer Isolation |
| Du Chunshui, Zhang Chenghui, Chen Alian, Zhao Fangde, Xiao Weirong |
| Shandong University Jinan 250061 China |
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Abstract To satisfy the need of the high input voltage in three-phase grid-connected photovoltaic (PV) inverter, overcome the shortage of power frequency isolation transformer severe material consumes. An improved boost-voltage phase-shifted full-bridge soft switching converter is presented. It has two step-up windings rectifiers in series and one step-down winding in series with a linear reactor. The former is used to increase the output voltage; the latter is used to ensure the devices soft switching in the full power scope. Firstly, its principle is analyzed with detail. Secondly, an asymmetrical digital phase-shift pulse width modulation (PWM) control scheme and the implement method are given. The last, the control software is designed, and a prototype is completed. Experimental results show that the control scheme is feasible, the converter has high efficiency.
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Received: 02 November 2010
Published: 07 March 2014
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2011, Vol. 26 
