Designing and Simulating of Step-Up DC-DC Converter for Fuel Cell Electric Vehicles

Subject Areas : Electronic Engineering

Maher Abdulnabi Alwan ¹ (Department of Electrical Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Khorasgan, Isfahan, Iran)
Ghazanfar Shahgholian ² (Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran)

Received: 2023-09-23 Accepted : 2024-02-16 Published : 2024-09-20

Keywords: Clamp capacitor, Step-up converter, Zero current switching, Zero voltage switching,

Abstract :

Step-Up DC-DC Converters are widely used in electric vehicles, because the use of batteries and fuel cells increases the voltage level to drive the electric motor. One of the problems of step-up converters is the increase in volume and weight due to step-up transformers. So far, various methods, such as switched capacitor, coupled inductor and multiplier circuits, have been used to eliminate the transformer and reduce the volume and weight of the circuit. To further reduce the volume and weight of the circuit, it is necessary to increase the switching frequency, which is possible only by using the soft switching method. Using an auxiliary switch to create soft switching conditions is common in most methods, because not using an auxiliary switch imposes voltage and current stress on the circuit. In this article, a step-up converter with an auxiliary circuit of zero voltage transition (ZVT) is presented, which provides switching conditions at zero voltage to turn on the switch and switching at zero voltage to turn off the switch. The voltage stress of the converter is very low, and all the diodes are switched off at zero current, so they do not have reverse recovery problems. Also, in addition to absorbing the energy of the leakage inductor, the clamp capacitor helps to increase the gain of the converter. The provided converter is simulated in P-Spice software. To check the performance of the converter, a laboratory model with a power of 150 watts has been designed and tested.

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