Low-Voltage Stress Buck-Boost Converter With a High-Voltage Conversion Gain

Abstract

The conventional buck-boost converter has the advantages of simple structure, low cost, and the capability to achieve both voltage step-up and down. However, due to the negative impacts of the parasitic parameters of the device, the voltage conversion gain of the conventional buck-boost converter is greatly limited. A low-voltage stress buck-boost converter with a high voltage conversion gain based on a coat circuit is proposed in this paper to address the problem. Similar to a coat that can enhance human's resistance to cold weather, by adding the proposed coat circuit to the conventional buck-boost converter, not only the range for the voltage conversion can be extended, but also the voltage stresses of the semiconductor components are effectively reduced. In this work, comprehensive analysis on the working principles and performance characteristics of the coat converter are provided. Experimental results are obtained and analyzed to validate of the theoretical analysis based on a 300W closed-loop prototype platform.INDEX TERMS Buck-boost, coat circuits, high voltage conversion gain, voltage stress.

Transformerless High Step-Up DC-DC Converter With Low Voltage Stress for Fuel Cells

“…If τ is smaller than τB the proposed converter is operated in DCM operation. Compared to the converters proposed in [14], [15], and [27], the proposed converter will be less likely to work in DCM when D/Dmax<0.5. Also, the influence of the parameters on the boundary conditions is depicted in Fig.…”

“…Various transformerless boost techniques have been proposed. The focus of the research studies includes super-lift [8], switched-capacitor [9], switched-inductor [10], voltage multiplier [11], quadratic boost and buck-boost circuit [12], [13], coat circuit [14], [15], and cascade techniques [16]. However, although the high voltage gain can be achieved, the high duty ratio of the switch is required, which may cause the saturation of the inductors.…”

Single-Switch High Step-Up Zeta Converter Based on Coat Circuit

“…Based on some classical converters such as buck-boost, boost, and Zeta converters, some dc-dc converters with high voltage conversion ration have been proposed in [20][21][22][23][24][25][26][27][28][29][30]. The performance comparison between the proposed Zeta converter, some of these converters, and the traditional Zeta converter is presented in Table 1.…”

“…For further improving the voltage gain of classical buckboost converters, some expandable converters have been proposed in [28][29][30]. Compared to the classical buck-boost converter, the converter presented in [28] can improve the voltage gain with lower voltage stress on the devices by using the scalable voltage multipliers. A family of non-isolated dcdc converters have been proposed in [29] based on the switched capacitor structures.…”

60-V Non-Inverting Four-Mode Buck–Boost Converter With Bootstrap Sharing for Non-Switching Power Transistors

“…P OWER converters are an important aspect of electronic systems owing to their high power conversion efficiency, especially for battery-operated systems. Among the various power converter architectures, non-inverting buck-boost converters are becoming vital for wide input voltage ranges [1]- [7]. For low-voltage portable devices, non-inverting buckboost converters are important for maximizing the use of discharged battery voltage [8]- [12].…”