An improved ZVT-PWM DC-DC converter using additional circuit

Kaewarsa, Suriya; Krongkitsiri, Wichai; Prapanavarat, C.; Yangyuen, U.

doi:10.1109/tencon.2004.1414904

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Fig 2 Proposed Zvt Pwm Boost Pfc Converter1

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“…3 and 4, respectively. To analyze the steady state operation, all components and devices are assumed to be ideal and the boost inductor ( L ) and output capacitor ( o C ) are assumed to be large enough to treat as a current source and a voltage source, respectively (Kaewarsa, et al 2004).…”

Section: Fig 2 Proposed Zvt Pwm Boost Pfc Convertermentioning

confidence: 99%

An improved zero-voltage-transition technique in a single-phase power factor correction circuit

Kaewarsa

Prapanavarat²,

Yangyuen³

2004 International Conference on Power System Technology, 2004. PowerCon 2004.

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This paper presents an improved Zero-Voltage-Transition Technique (ZVT-Technique) in a single-phase active power factor correction circuit based on a dc-dc boost converter topology and operated in a continuous-inductor-current mode with fixed-switching frequency control. An additional circuit for reducing the turn-off switching loss of the auxiliary switching circuit was applied. Experimental work was carried out with a circuit operated at 220 V rms input voltage, 400 V dc output voltage, 500 W output power and 40 kHz switching frequency. The test results showed that the efficiency was improved from 95 to 97%t with the proposed circuitry, while the power factor was constant.

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Section: Fig 2 Proposed Zvt Pwm Boost Pfc Convertermentioning

confidence: 99%