High Voltage Gain DC/DC Converter Using Coupled Inductor and VM Techniques

Abstract

In this study, a new non-isolated high voltage gains dc/dc converter using coupled inductor and voltage multiplier techniques (diode/capacitor) is presented. The voltage gain will be increased by increasing the turns ratio (N) and the number of stages of the VM units. The proposed converter capable to more increase the output voltage gains with transfer energy which is stored in coupled inductance. Also, the voltage multiplier unit causes to further increase in the output voltage level of the proposed converter. Besides, the nominal value of the semiconductors is low due to these are clamped to the capacitors available on the voltage multiplier units. The normalized voltage stress across the semiconductors is low which this case is compared in the comparison section. Therefore, the power loss of switch can be reduced by using a switch with a lower rating (lower RDS(on)) and power diodes with the low nominal rating. As a result, the overall efficiency of the proposed converter will be high. To confirm the benefits of working in this paper, comparison results for different items with other works are provided in section 4. The principle of operation, the theoretical analysis and the experimental results of a laboratory prototype for N(N2/N1) = 2 and n = 2 stage in about 260W with operating at 40kHz are provided.

Keywords

• DC/DC converter
• high voltage gain
• coupled-inductor techniques
• lower losses