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<p>An electric vehicles (EVs) high voltage traction motor and low voltage batteries are connected by means of a bidirectional DC-DC converter. When using a traditional bidirectional converter with an acceptable voltage range, the EV speed's fine variation is limited. Since the generated voltage during the regenerative braking process is inadequate to charge the battery, when the speed drops below a particular threshold, the regenerated energy is unable to be retained. This paper presents a high-efficiency non-isolated bidirectional DC-DC converter for EVs, capable of operating in buck, boost, and buck-boost modes. Designed to bridge the voltage gap between traction systems and batteries, the converter achieves up to 2 × voltage gain in boost mode and supports a wide input range of 42–56&#xa0;V. A Proportional-Integral (PI) control algorithm ensures smooth mode transitions and optimized energy flow. Experimental results demonstrate an average efficiency of 97.37%, with individual mode efficiencies exceeding 96%. The design reduces voltage stress on switches by 50%, enhancing reliability. The prototype validated performance under both resistive and battery loads, confirming its stability across dynamic conditions. This compact and cost-effective topology is well-suited for real-time EV applications, ensuring enhanced energy recovery during regenerative braking.</p>

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Enhanced Energy Transfer in Electric Vehicles via a Non-Isolated Bidirectional Converter

  • 期刊论文

  • 发表日期：

    2025年5月23日

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  • Subramanian Vasantharaj,
  • Mohan Bharathidasan,
  • S. Naveen Prakash

摘要

An electric vehicles (EVs) high voltage traction motor and low voltage batteries are connected by means of a bidirectional DC-DC converter. When using a traditional bidirectional converter with an acceptable voltage range, the EV speed's fine variation is limited. Since the generated voltage during the regenerative braking process is inadequate to charge the battery, when the speed drops below a particular threshold, the regenerated energy is unable to be retained. This paper presents a high-efficiency non-isolated bidirectional DC-DC converter for EVs, capable of operating in buck, boost, and buck-boost modes. Designed to bridge the voltage gap between traction systems and batteries, the converter achieves up to 2 × voltage gain in boost mode and supports a wide input range of 42–56 V. A Proportional-Integral (PI) control algorithm ensures smooth mode transitions and optimized energy flow. Experimental results demonstrate an average efficiency of 97.37%, with individual mode efficiencies exceeding 96%. The design reduces voltage stress on switches by 50%, enhancing reliability. The prototype validated performance under both resistive and battery loads, confirming its stability across dynamic conditions. This compact and cost-effective topology is well-suited for real-time EV applications, ensuring enhanced energy recovery during regenerative braking.