S. Kiruthika, S. Sudarsan, M. Murugesan, B. Jayamanikandan
Abstract: Nowadays the demand for DC-DC converters and related semiconductor components is an emerging expectation to meet the pursuit of energy efficiency and to reduce the power demand. Hence the Multiphase DCDC converters based topology applied for high-voltage and high-power applications are proposed in this paper. The proposed converter is configured such that the boost - half-bridge (BHB) cells and voltage doublers are connected in parallel and in series to increase the output voltage and the output power. In addition, the proposed converter has the advantages of high-step-up voltage gain with significantly reduced transformer turn ratio, low input current ripple due to interleaving effect, zero-voltage switching turn-on of switches and zero-current switching turn-off of diodes, no additional clamping and start-up circuits required, high component availability and easy thermal distribution due to the use of multiple small components and flexibility in device selection results in better design. The inverter is capable of producing seven levels of output-voltage levels from the dc supply voltage. Multilevel inverters offer improved output waveforms and lower THD. A PWM switching scheme for the multilevel inverter is generally preferred. By controlling the modulation index, the desired number of levels of the inverters output voltage can be achieved. The device current rating of the proposed multiphase converter is reduced by increasing the number of parallel connection, and the device voltage rating is reduced by increasing the number of series connection.
Keywords: Diode Clamped Multilevel Inverter DCMLI, DC-DC converter, pulse width modulation, zero current switching