Abstract
A Single-Ended Primary-Inductor Converter (SEPIC) converter with an Inductor-Capacitor (LC) regenerative snubber is proposed to reduce Electromagnetic Interference (EMI) for Electric Vehicle (EV) applications. The switching energy is transferred through a capacitor to an inductor which is coupled to SEPIC inductors. This technique reduces the number of components and also returns some of switching energy to SEPIC converter. The mathematical analysis and optimization of LC snubber with respect to number of turns is also presented. Spice simulations and experimental results are provided to verify its performance. The proposed LC regenerative snubber reduces the peak voltage by 16 V on the switching transistor during the switching transient. It is also indicated that 8 dB reduction is achieved in the EMI measurements at ringing frequency and 10 dB reduction at high frequency band.
Highlights
Over the past decades, research has been directed towards Electric Vehicle (EV) to improve the environmental conditions [1]
The current use of DC/DC converters with transformers or coupled inductors causes the following problems in the EV system; high voltage stress across the the power switch, increasing the converter area, and increasing the Electromagnetic Interference (EMI) [2]
Several typologies of DC/DC converters are used in EV applications such as Buck converter, Boost converter, Buck-boost converter, and Single-Ended Primary-Inductor Converter (SEPIC) converter
Summary
Research has been directed towards EV to improve the environmental conditions [1]. Energies 2020, 13, 5767 inductors or transformer in their circuit, SEPIC converter suffers from the energy stored in the leakage inductance of the primary inductor This energy causes a voltage stress on the switch transistor during the turn OFF period and may damage the Metal–Oxide Field–Effect Transistor (MOSFET) switch [8]. This method reduces the Electromagnetic Interference (EMI) which occurs due to the switching activity.
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