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Proceedings ArticleDOI

Soft-switched low-cost single phase high quality rectifier circuits with minimum voltage stress across the switches

01 Dec 1998-Vol. 2, pp 984-989

AbstractThis paper presents a family of circuits for single phase diode rectifiers capable of drawing approximately sinusoidal current waveforms at unity power factor with high efficiency and minimum voltage stress across the switches Moreover, they are suitable to work as boost and flyback converters These topologies use coupled inductors with capacitor for resonance to achieve zero voltage switching (ZVS) of the converters The circuits consist of a single-phase diode bridge rectifier, followed by a boost stage containing a single switch with zero current switching (ZCS) for turning on and ZVS as well as ZCS for turning off The output voltage is regulated by employing variable frequency control The paper explains the principle of operation and describes the analysis of each mode of operation for both boost and flyback converters It also gives design criteria, derived from the mathematical analysis carried out, for achieving ZVS under all loading conditions from no load to full load The simulation results obtained using PSPICE demonstrate the validity of the proposed converters

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References
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Journal ArticleDOI
20 Jun 1994
Abstract: Flyback derived power convertor topologies are attractive because of their relative simplicity when compared with other topologies used in low power applications. Incorporation of active-clamp circuitry into the flyback topology serves to recycle transformer leakage energy while minimizing switch voltage stress. The addition of the active-clamp circuit also provides a mechanism for achieving zero-voltage-switching (ZVS) of both the primary and auxiliary switches. ZVS also limits the turn-off di/dt of the output rectifier, reducing rectifier switching losses, and switching noise due to diode reverse recovery. This paper analyzes the behavior of the ZVS active-clamp flyback operating with unidirectional magnetizing current and presents design equations based on this analysis. Experimental results are then given for a 500 W prototype circuit illustrating the soft-switching characteristics and improved efficiency of the power converter. Results from the application of the active-clamp circuit as a low-loss turn-off snubber for IGBT switches is also presented.

385 citations

Journal ArticleDOI
Abstract: Flyback derived power convertor topologies have long been attractive because of their relative simplicity when compared with other topologies used in low-power applications. Incorporation of active clamp circuitry provides the additional benefit of recycling transformer leakage energy while minimizing switch voltage stress. This paper presents the analysis, design, and experimental results of 500 W single stage and 600 W interleaved active clamp flybacks used for power factor correction. Several practical issues, including the application of charge control, the use of mixed power devices, and a solution to the hold-up time problem are discussed and experimentally verified.

129 citations

Proceedings ArticleDOI
04 Oct 1992
Abstract: A zero voltage switched flyback power converter which realizes soft switching for every semiconductor is proposed. The sinusoidal resonant current flows through the secondary side rectifier diode and zero current switching of the diode is realized. Diode recovery is not generated. The proposed converter can operate with constant frequency pulse width modulation. High frequency switching and low noise are achieved. >

81 citations

Proceedings Article
01 Jan 1987

44 citations

Proceedings ArticleDOI
13 Feb 1994
Abstract: Flyback derived power convertor topologies have long been attractive because of their relative simplicity when compared with other topologies used in low power applications. Incorporation of active clamp circuitry provides the additional benefit of recycling transformer leakage energy while minimizing switch voltage stress. This paper presents the analysis, design, and experimental results of 500 W single stage and 600 W interleaved active clamp flybacks used for power factor correction. Several practical issues, including the application of charge control, the use of mixed power devices, and a solution to the hold-up time problem are discussed and experimentally verified. >

43 citations