Hybrid switched-capacitor quadratic boost converters with very high DC gain and low voltage stress on their semiconductor devices

By inserting a simple cell formed by a capacitor and diode into quadratic boost structures, new converters are obtained. They feature: a larger dc gain compared with that of quadratic boost converters and a smaller voltage stress on the switch and output diode, non-pulsating input current, as required for the use in conjunction with the environmental-friendly energy cells, easiness of the transistor driving, line-to-load common ground. The proposed cell can be easily generalized for enhancing the dc gain. The new converters compare favorably with available ones with the same reactive elements count. Simulations and experimental results confirm the theoretical analysis of the proposed converter.