Proceedings ArticleDOI
A forward pulse-width modulated quasi-resonant converter: analysis, design and experimental results
I. Barbi,J.B. Vieira,J.C. Bolacell +2 more
- pp 21-26
TLDR
In this paper, a forward pulsewidth modulated zero-current switching quasi-resonant converter (F-PWM-ZCS-QRC) is proposed to provide output voltage and power control at a constant operating frequency.Abstract:
The authors propose a forward pulse-width modulated zero-current switching quasi-resonant converter (F-PWM-ZCS-QRC), which, in contrast to the conventional forward frequency-modulated zero-current switching quasi-resonant converter (F-FM-ZCS-QRC), provides output voltage and power control at a constant operating frequency. The topology is generated by inserting an additional current-bidirectional switch in the conventional F-FM-ZCS-QRC. The operation principle and design-oriented analysis are presented, with normalized design curves, design procedure, numerical examples, simulations, and experimental results. Theoretical analysis was verified experimentally with a prototype rated at 100 W, operating at the resonant frequency of 1.56 MHz and a switching frequency of 500 kHz. It has been experimentally demonstrated that the proposed converter operates from full load down to 2% of full load, with a constant switching frequency of 500 kHz. >read more
Citations
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Journal ArticleDOI
A quasi-resonant quadratic boost converter using a single resonant network
Luiz H. S. C. Barreto,Ernane Antônio Alves Coelho,Valdeir J. Farias,J.C. de Oliveira,L.C. de Freitas,J.B. Vieira +5 more
TL;DR: According to the simulation and experimental results, this quadratic boost converter provides a larger conversion ratio than that provided by the conventional boost converter (for a given duty ratio D), and presents optimum performance, which operates with soft-switch commutation using a single resonant network.
Proceedings ArticleDOI
A boost converter associated with a new nondissipative snubber
TL;DR: In this paper, a boost converter with a nondissipative snubber is presented, which allows the main switch to operate in a ZVS way and the auxiliary switch to work in a CS way.
Proceedings ArticleDOI
An unity high power factor power supply rectifier using a PWM AC/DC full bridge soft-switching
C.A. Gallo,J.A. Correa Pinto,L.C. de Freita,Valdeir J. Farias,Ernane Antônio Alves Coelho,J.B. Vieira +5 more
TL;DR: In this article, the authors proposed an improvement of an isolated unity-power-factor rectifier AC/DC PWM based on a PWM full bridge converter using a commutation cell.
Journal ArticleDOI
The bang-bang hysteresis current waveshaping control technique used to implement a high power factor power supply
Luiz H. S. C. Barreto,Ernane Antônio Alves Coelho,Valdeir J. Farias,L.C. de Freitas,J.B. Vieira +4 more
TL;DR: In this article, the authors reported the operation and development of a high power factor power supply that operates at high switching frequency using an ac-dc boost converter associated to a nondissipative snubber as a pre-regulator circuit, which presented reduced commutation losses.
Proceedings ArticleDOI
A nondissipative snubber applied to the forward-PWM-ZVS-SR
TL;DR: This paper presents a forward converter with a nondissipative snubber that allows the main switch toWork in a ZVS way and the auxiliary switch to work in aZCS way.
References
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Journal ArticleDOI
High-frequency quasi-resonant converter technologies
TL;DR: In this article, a host of new quasi-resonant converters (QRCs) are derived from conventional PWM converters, with a significant improvement in performance and power density.
Journal ArticleDOI
Buck quasi-resonant converter operating at constant frequency: analysis, design and experimentation
TL;DR: In this article, a buck frequency-modulated zero-current switching quasi-resonant converter (buck PWM ZCS QRC) operating at constant frequency is discussed.