Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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A Novel Soft Switching PWM·PFC AC·DC Boost Converter

  • Sahin, Yakup (Dept. of Electrical and Electronic Engineering, Bitlis Eren University)
  • Received : 2017.02.03
  • Accepted : 2017.09.26
  • Published : 2018.01.01
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Abstract

This study introduces a novel Soft Switching (SS) Pulse Width Modulated (PWM) AC-DC boost converter. In the proposed converter, the main switch is turned on with Zero Voltage Transition (ZVT) and turned off with Zero Current Transition (ZCT). The main diode is turned on with Zero Voltage Switching (ZVS) and turned off with Zero Current Switching (ZCS). The auxiliary switch is turned on and off with ZCS. All auxiliary semiconductor devices are turned on and off with SS. There is no extra current or voltage stress on the main semiconductor devices. The majority of switching energies are transferred to the output by auxiliary transformer. Thus, the current stress of auxiliary switch is significantly reduced. Besides, the proposed converter has simple structure and ease of control due to common ground. The theoretical analysis of the proposed converter is verified by a prototype with 100 kHz switching frequency and 500 W output power. Furthermore, the efficiency of the proposed converter is 98.9% at nominal output power.

Keywords

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Fig. 1. Proposed novel soft switching PWM-PFC AC-DCboost converter

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Fig. 2. Equivalent circuit schemes for operating stages

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Fig. 3. Key waveforms concerning the operation stages inthe proposed converter

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Fig. 4. Experimental results of current and voltagewaveforms of (a) S1, (b) DF, (c) S2 (200 V/div, 10A/div, 2 μs/div), and (d) voltage and currentwaveform of the line (100 V/div, 2 A/div, 5 ms/div)

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Fig. 5. Power factor depend on varying line voltage

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Fig. 6. The efficiency curves of the proposed convertercomparatively

Table 1. The experimental parameters and the device values of proposed converter

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Table 2. Some significant values of the semiconductor elements used in the prototype converter

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