Abstract
This paper presents a new soft switching boost converter with a passive snubber cell without additional active switches for battery charging systems. The proposed snubber finds its application in the front-end ac-dc converter of Plug-in Hybrid Electric Vehicle (PHEV) battery chargers. The proposed auxiliary snubber circuit consists of an inductor, two capacitors and two diodes. The new converter has the advantages of continuous input current, low switching stresses, high voltage gain without extreme duty cycle, minimized charger size and charging time and fewer amounts of cost and electricity drawn from the utility at higher switching frequencies. The switch is made to turn ON by Zero Current Switching (ZCS) and turn OFF by Zero Voltage Switching (ZVS). The detailed steady state analysis of the novel ac-dc Zero Current- Zero Voltage Switching (ZC-ZVS) boost Power Factor Correction (PFC) converter is presented with its operating principle. The experimental prototype of 20 kHz, 100 W converter verifies the theoretical analysis. The power factor of the prototype circuit reaches near unity with an efficiency of 97%, at nominal output power for a ±10% variation in the input voltage and ±20% variation in the snubber component values.
Highlights
Plug-in Hybrid Electric Vehicles (PHEVs) are hybrid electric vehicles containing batteries that are rechargeable and restorable to complete charge by connecting the plug of vehicle to an external electric power source
Passive Power Factor Correction (PFC) is low cost since it does not require active switches and complex control circuits but it cannot provide high power factors like active PFC, so the active type is widely applied for PFC
When the switch is turned ON at t = t1, the reverse recovery current of the main diode D f flows through the resonant inductor. `V0 ́ VC2 ̆ is the voltage to be absorbed by LS to avail the Zero Current Switching (ZCS) condition to turn ON the switch S
Summary
Plug-in Hybrid Electric Vehicles (PHEVs) are hybrid electric vehicles containing batteries that are rechargeable and restorable to complete charge by connecting the plug of vehicle to an external electric power source. During the most recent decade, numerous standards were introduced for ac-dc converters in order to draw pure sinusoidal currents from the utilities [6,7]. They involve a diode rectifier at the front end leading to harmonics in the input current waveform. In order to shape the input current to be sinusoidal and thereby to improve the power factor, PFC is required. Passive PFC is low cost since it does not require active switches and complex control circuits but it cannot provide high power factors like active PFC, so the active type is widely applied for PFC. Various active PFC methodologies are available for boost circuits to bring high power factor ability with ease of control attracting more research on this topic [8,9,10,11]
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