Novel soft transition pushpull converter: Analysis, modeling, design and implementation
01 Nov 2011-pp 1486-1491
TL;DR: In this paper, a soft transition push pull converter is proposed, which achieves lossless switching for the two main and two auxiliary switches without increasing the main device current/voltage rating.
Abstract: A novel soft transition push pull converter is proposed in this paper. The proposed circuit achieves loss-less switching for the two main and two auxiliary switches without increasing the main device current/voltage rating. A tapping in the isolation transformer is added for the purpose of commutation. The proposed circuit is capable of operation at elevated switching frequencies of several hundreds of kHz, in a range of line and load variations. Steady state performance, the operating principle and theoretical analysis is outlined for the proposed pushpull converter. The steady state conversion ratio and the equivalent circuit model is presented. Experimental results are presented which verifies the steady state performance of the converter. The experimental waveforms are in agreement with the theoretical.
Citations
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01 Dec 2012
TL;DR: In this paper, an active soft switching circuit for bridge converters aiming at improving the power conversion efficiency is proposed, which achieves lossless switching for both main and auxiliary switches without increasing the main device current/voltage rating.
Abstract: This paper proposes an active soft-switching circuit for bridge converters aiming at improving the power conversion efficiency. The proposed circuit achieves loss-less switching for both main and auxiliary switches without increasing the main device current/voltage rating. It is capable of operating at elevated switching frequencies of several hundreds of kHz, at low and high power levels with a wide range of load variations. A winding coupled to the primary of power transformer ensures soft switching for the auxiliary switches during turn-on and turn-off. Phase Shifted Full Bridge (PSFB) topology is chosen to validate the design. Operation principle with analytical expressions for the proposed circuit are outlined. The proposed active soft switched PSFB DC-DC converter circuit is designed and implemented for 350 W, switching at 100 kHz. The simulation and experimental results are presented. Experimental results are used to validate the analysis.
4 citations
Cites methods from "Novel soft transition pushpull conv..."
...Several techniques have been proposed to extend the ZVS range of PSFB converters [13][15]....
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Journal Article•
TL;DR: An active soft-switching circuit for bridge converters aiming to improve the power conversion efficiency and efficiency is proposed, compared with passive soft switched PSFB in terms of efficiency and loss in duty cycle.
Abstract: This paper proposes an active soft-switching circuit for bridge converters aiming to improve the power conversion efficiency. The proposed circuit achieves loss-less switching for both main and auxiliary switches without increasing the main switch current/voltage rating. A winding coupled to the primary of power transformer ensures ZCS for the auxiliary switches during their turn-off. A 350 W, 100 kHz phase shifted full bridge (PSFB) converter is built to validate the analysis and design. Theoretical loss calculations for proposed circuit is presented. The proposed circuit is compared with passive soft switched PSFB in terms of efficiency and loss in duty cycle. Keywords—Active soft switching, passive soft switching, ZVS, ZCS, PSFB.
1 citations
References
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01 Jan 1984
TL;DR: In this paper, an exact and systematic method of small-signal analysis is given whereby the control-to-output transfer function, audio susceptibility, and input impedance are determined at a given operating point.
Abstract: The load parameter, Q, and the ratio of the switching frequency to the resonant frequency, Fs/Fo, characterize the operation of resonant converters. An accurate do analysis of the series and parallel resonant converters is given in terms of these parameters whereby the conversion ratio, peak stresses, and diode conduction time are determined. An exact and systematic method of small-signal analysis is given whereby the control-to-output transfer function, audio susceptibility, and input impedance are determined at a given operating point. In addition, simple and approximate transfer functions are obtained under high-Q assumption.
68 citations
"Novel soft transition pushpull conv..." refers background in this paper
...The resonant or soft switching technologies evolved through the variable frequency load resonant converters [2], Quasiresonant converters (QRC) [3] and constant frequency Resonant Transition Converters [4]- [15]....
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...High frequency switching is possible by resonant topologies [2] - [15]....
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05 Oct 1997
TL;DR: In this paper, a new LCL-resonant DC-DC power converter topology is presented in which the resonant CL components are located after the output rectifier diodes.
Abstract: A new LCL-resonant DC-DC power converter topology is presented in which the resonant CL components are located after the output rectifier diodes. The push-pull power converter topology is suitable for unregulated low-voltage to high-voltage power conversion, as in battery powered systems where input currents can exceed input voltages by an order of magnitude. The resonant circuit operates at twice the switching frequency, allowing for small resonant components. The MOSFET primary switches operate under zero voltage switching (ZVS) conditions due to commutation of the transformer magnetizing current and the snubbing effect of the drain-source capacitance. Output rectifier turn-off is effectively snubbed by the resonant capacitor. Laboratory tests show 93% efficiency at 12 V, 160 A input; 235 V, 1.8 kW output. A surge capability of 5 kW for 1 s has been demonstrated. Circuit simulations and experimental results are presented and are shown to have excellent agreement with fundamental mode analysis.
66 citations
07 Aug 2002
TL;DR: In this article, an improved push-pull forward converter with a single EI or EE core for all the magnetic components including the input inductor, the stepdown transformer and the output inductors is proposed.
Abstract: This paper proposes an improved push-pull forward converter with a single EI or EE core for all the magnetic components including the input inductor, the stepdown transformer and the output inductors. This topology is essentially the modified push-pull converter with the built-in input filter and the coupled-inductor current doubler rectifier. The proposed integrated magnetics features minimized leakage inductance and an air gap in only the center leg; its winding and core losses are both lower than those of conventional integrated magnetic structures.
44 citations
TL;DR: The advantages of the proposed topology include soft switching in both the main and auxiliary switches, recovery of the leakage inductance energy, simplified power transformer achieving self-reset without using the conventional reset winding, simple gate drive and control circuit, etc.
Abstract: This paper presents a forward converter topology that employs a small resonant auxiliary circuit. The advantages of the proposed topology include soft switching in both the main and auxiliary switches, recovery of the leakage inductance energy, simplified power transformer achieving self-reset without using the conventional reset winding, simple gate drive and control circuit, etc. Steady-state analysis is performed herein, and a design procedure is presented for general applications. A 35-75-Vdc to 5 Vdc 100-W prototype converter switched at a frequency of 200 kHz is built to verify the design, and 90% overall efficiency has been obtained experimentally at full load.
42 citations
"Novel soft transition pushpull conv..." refers background in this paper
...The soft switching topologies has been extended for isolated converters [16] - [25]....
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TL;DR: In this article, a self-commutated auxiliary circuit is proposed to achieve zero-current conditions (ZCS) for auxiliary switch commutations under wide line and load ranges, without the inclusion of any kind of DC voltage source.
Abstract: This paper introduces a novel class of zero voltage transition (ZVT) DC/DC pulse-width modulation (PWM) converters that use a resonant inductance-capacitance (L-C) circuit connected to the auxiliary switch, which is termed a self-commutated auxiliary circuit. It provides a simple and reliable means of achieving zero-current conditions (ZCS) for auxiliary switch commutations under wide line and load ranges, without the inclusion of any kind of DC voltage source. Furthermore, this auxiliary circuit is placed in parallel with the main power converter, retaining the ZVT characteristics. The self-commutated auxiliary circuit ZVT PWM boost is analyzed, and its feasibility and reliability are confirmed by experimental results obtained from laboratory prototypes rated at 1 kW and 100 kHz.
34 citations