Abstract
In fuel cell vehicles, the output voltage of the fuel cell source is typically much lower than the voltage required by the dc bus, and also this output voltage drops significantly as the output current increases. In order to match the output voltage of the fuel cell source to the dc bus voltage, a new dc–dc boost converter with a wide input range and high voltage gain is proposed to act as the required power interface, which reduces voltage stress across the power devices and operates with an acceptable conversion efficiency. A prototype rated at 300 W/400 V has been developed and the maximum efficiency of the proposed converter was measured as 95.01% at 300 W. Experimental results are presented to validate the effectiveness of the proposed converter.
Highlights
As nonrenewable resources such as oil, gas and coal become scarce, more and more research is focused on the problem of high energy usage and society’s dependence on fossil fuels [1]-[3]
A step-up DC-DC converter with a wide range of voltage-gain is essential to interface between the low voltage fuel-cell source and the high voltage DC bus of the motor drive inverter
The voltage stress across C4 is less than half of the output high voltage Uo, whilst the voltage stresses across C3 and C5 are less than two thirds of Uo
Summary
As nonrenewable resources such as oil, gas and coal become scarce, more and more research is focused on the problem of high energy usage and society’s dependence on fossil fuels [1]-[3]. The switched-capacitor circuit was studied in [20]: it achieves flexible voltage regulation by combining it with other DC-DC converters, the difference in potential between the ground points of the input voltage source side and the load side is a high frequency PWM voltage, because instead of a common ground structure, there is a diode located between the ground points of the input voltage source side and the load side As a result, it may introduce issues associated with du/dt and these may limit its applications [21]-[22]. The volume and cost of these converters will be increased To address these issues, a new non-isolated high ratio step-up dc-dc converter is proposed in this paper, which has the following features: 1) It reduces the voltage stress across the power devices and has a common ground between the input and output sides.
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