Abstract
This paper presents a novel soft switching circuit for the boost converter. This is done through an additional auxiliary switch and a resonant circuit. It provides zero voltage switching for the main switch and zero current switching for the auxiliary switch. The paper presents the idealized analysis giving all the circuit intervals and the equations necessary to design such a circuit. The proposed soft switching circuit is particularly suited for the tapped inductor boost circuit. Extension of the method to tapped inductor boost converter addresses the application of zero voltage transition to high conversion ratio converters. A laboratory prototype boost converter rated 125 W; 24 V input confirms the theoretical results and design methods. Both simulation and experimental results show that soft switching can be achieved for a wide line and load range.
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source voltage 50 V/Div. Ch4: auxiliary inductor current 5A/Div. Horizontal scale: 0.5us/Div, f = 100 kHz. b Experimental results. Ch1: auxiliary switch gate pulse voltage 20 V/Div. Ch2: main switch gate pulse voltage 20 V/Div. Ch3: main switch drain source voltage 50 V/Div. Ch4: main switch drain source current 5A/Div. Horizontal scale: 2us/Div, f = 100 kHz. c Light load experimental results. Ch1: auxiliary inductor current 2A/Div. Ch2: main switch gate pulse voltage 20 V/Div. Ch3: main switch drain source voltage 50 V/Div. Ch4: main switch drain source current 2A/Div. Horizontal scale: 0.5us/Div, f = 100 kHz. d Turn-off experimental results. Ch1: auxiliary switch gate pulse voltage 20 V/Div. Ch2: main switch gate pulse voltage 20 V/Div. Ch3: main switch drain source voltage 50 V/Div. Ch4: main switch drain source current 2A/Div. Horizontal scale: 0.5us/Div, f = 100 kHz. e Experimental results. Ch1: auxiliary switch gate pulse voltage 20 V/Div. Ch2: Main switch gate pulse voltage 20 V/Div. Ch3: main switch drain source voltage 50 V/Div. Ch4: input current 10A/Div. Horizontal scale: 2us/Div, f = 100 kHz
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Mirzaei, R., Ramanarayanan, V. An Auxiliary Switch Commutated ZVS Boost Converter with Coupled Inductor. Iran J Sci Technol Trans Electr Eng 46, 665–674 (2022). https://doi.org/10.1007/s40998-022-00504-6
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DOI: https://doi.org/10.1007/s40998-022-00504-6