A Family of Single-Switch PWM Converters With High Step-Up Conversion Ratio

Abstract

A new family of a single-switch three-diode dc-dc pulsewidth-modulated (PWM) converters operating at constant frequency and constant duty cycle is presented in this paper. The proposed converters are different from the conventional dc-dc step-up converters, and they posses higher voltage gain with small output voltage ripples. Other advantages of the proposed converters include lower voltage stress on the semiconductor devices, simple structure, and control. Moreover, the reduced voltage stress on the diodes allows using Schottky diodes for alleviating the reverse-recovery current problem, as well as decreasing the switching and conduction losses. The principle of operation, theoretical analysis, and experimental results of one prototype rated 40 W and operating at 94 kHz are provided in this paper to verify the performance of this new family of converters.

A Non-isolated High Step-up DC/DC Converter with Low EMI and Voltage Stress for Renewable Energy Applications

“…However, the current stress is high and the voltage stress of the diode in the last stage is equal to the high output voltage leading to more losses. In [9][10], switched-capacitor-based boost converters with only one switch are presented. In these converters not only the input current is continuous, but also the switch voltage stress is significantly reduced and the gain is increased.…”

A novel buck-boost converter

“…In Liao et al (2012) a non-inverting buck-boost converter for fuel cell systems was proposed. Ismail et al (2008) put two switched capacitor cell into the basic converter and obtained a series of DC-DC converters but input and output are not common grounded. Miao et al (2016) proposed a buck-boost topology with high step-down gain, common ground between input and output and low voltage stresses on switches and diodes.…”

Dynamics and control of a novel buck-boost converter with low stresses on switches and diodes

“…In Liao et al (2012) a noninverting buck-boost converter for fuel cell systems was proposed. Ismail et al (2008) puts two switched capacitor cell into the basic converter and obtained a series of DC-DC converters but input and output are not common grounded. Designing appropriate controller is an important aspect of power electronics converters.…”