Cascaded DC-DC Converter With Dual Output

Extremely high duty cycle of boost converter may result in higher conduction losses. To achieve a high conversion ratio without operating at extremely high duty ratio, some converters based on transformers or coupled inductors or tapped inductors have been provided. However, the leakage inductance in the transformer, coupled inductor or tapped inductor will cause high voltage spikes in the switches and reduce system efficiency. A novel single switch cascaded dc-dc converter of boost and buck boost converters have extended voltage conversion ratio to d/(1-d)2 . The features of the converter are high voltage gain; only one switch for realizing the converter, the number of magnetic components is small etc. So comparing with other topologies cascaded converter is more effective. Simulation of the converter for a dc input voltage and fixed duty cycle was done, and the same was verified experimentally for a low input voltage. The software used for simulation was MatlabR2014a.