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A New Isolated Series-Resonant AC–DC Converter for EV
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DOI：10.1109/tpel.2026.3697934.png)
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Abstract
En 中文
This article proposes an isolated series resonant (ISR) AC–DC converter with reduced voltage stress. The proposed topology employs a split-capacitor half-bridge configuration with bidirectional AC-side switches and incorporates a semiactive rectifier on the DC side to eliminate secondary-side circulating current and prevent reverse power flow. This effectively controls the power conversion through phase-shift control. The proposed converter eliminates transformer saturation and achieves zero-voltage-switching (ZVS) turn-<sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> for all switches. The reduced voltage stress allows using low-voltage devices with lower drain-to-source on-state resistance and output capacitance. The optimized operation keeps conduction losses comparable while significantly reducing switching losses. As a result, total losses are reduced. This enables operation at higher switching frequencies while maintaining high efficiency. A self-regulated mechanism is introduced to suppress transformer saturation in the ISR AC–DC converter. A 1-kW experimental prototype is developed, achieving full ZVS over the entire line cycle with unity power factor and high efficiency across a wide range of input voltage and load conditions; the results closely match the theoretical analysis, and validate the working of the converter.
Keywords:
Isolated series resonant (ISR)
semiactive rectifier (SAR)
single stage (s-stage)
split capacitor semidual active bridge (SC-SDAB)
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6.5
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1.7W
Citations:
8.3W
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