A High Step-Up Converter with Voltage-Multiplier Modules for Sustainable Energy Applications
This project proposes a novel isolated high step-up converter for sustainable energy applications. Through an adjustable voltage-multiplier module, the proposed converter achieves a high step-up gain without utilizing either a large duty ratio or a high turns ratio. The voltage-multiplier modules are composed of coupled inductors and switched capacitors. Due to the passive lossless clamped performance, leakage energy is recycled, which alleviates a large voltage spike across the main switches and improves efficiency. Thus, power switches with low levels of voltage stress can be adopted for reducing conduction losses. In addition, the isolated topology of the proposed converter satisfies electrical-isolation and safety regulations. The proposed converter also possesses continuous and smooth input current, which decreases the conduction losses, lengthens life time of the input source, and constrains conducted electromagnetic-interference problems.
Many isolated step-up converters without continuous and smooth input current levels result in conducted electromagnetic-interference (EMI) problems. Thus, a bulky input filter must be designed in order to meet safety regulations. Moreover, such isolated step-up converters need more complex pulse-width modulation (PWM) control, which increases cost and decreases reliability.
The proposed high step-up converter with voltage-multiplier modules for sustainable energy applications, which simultaneously satisfies the requirements for electrical-isolation and safety regulations, is shown in Fig.
The advantages of the proposed converter are as follows.
Voltage-multiplier modules make the voltage gain higher and voltage stresses lower.
The proposed converter possesses continuous and smooth input current, which decreases the conduction losses, lengthens the life time of the input source, and constrains conducted EMI problems.
Due to the passive lossless clamped performance, the leakage energy is recycled. Hence, the potential for a large voltage spike across the main switch is alleviated and the efficiency is improved
TOOLS AND SOFTWARE USED:
Kuo-Ching Tseng, Chi-Chih Huang and Chun-An Cheng, Member, IEEE, “A High Step-Up Converter with Voltage-Multiplier Modules for Sustainable Energy Applications”, IEEE Journal of Emerging and Selected Topics in Power Electronics, 2015.