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http://dx.doi.org/10.5370/JEET.2017.12.3.1187

A Non-isolated High Step-up DC/DC Converter with Low EMI and Voltage Stress for Renewable Energy Applications  

Baharlou, Solmaz (Dept. of Electrical Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University)
Yazdani, Mohammad Rouhollah (Dept. of Electrical Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University)
Publication Information
Journal of Electrical Engineering and Technology / v.12, no.3, 2017 , pp. 1187-1194 More about this Journal
Abstract
In this paper, a high step-up DC-DC PWM converter with continuous input current and low voltage stress is presented for renewable energy application. The proposed converter is composed of a boost converter integrated with an auxiliary step-up circuit. The auxiliary circuit uses an additional coupled inductor and a balancing capacitor with voltage doubler and switching capacitor technique to achieve high step-up voltage gain with an appropriate switch duty cycle. The switched capacitors are charged in parallel and discharged in series by the coupled inductor, stacking on the output capacitor. In the proposed converter, the voltage stress on the main switch is clamped, so a low voltage switch with low ON resistance can be used to reduce the conduction loss which results in the efficiency improvement. A detailed discussion on the operating principle and steady-state analyses are presented in the paper. To justify the theoretical analysis, experimental results of a 200W 40/400V prototype is presented. In addition, the conducted electromagnetic emissions are measured which shows a good EMC performance.
Keywords
Boost converter; Electromagnetic interference (EMI); Electromagnetic compatibility (EMC); High step-up DC-DC converter; Switched capacitors; Voltage stress;
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Times Cited By KSCI : 5  (Citation Analysis)
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