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Journal ArticleDOI

Zero-voltage-switching multi-resonant technique-a novel approach to improve performance of high frequency quasi-resonant converters

11 Apr 1988-Vol. 4, Iss: 4, pp 450-458
TL;DR: In this paper, a novel multiresonant switch concept is proposed to overcome the parasitic oscillations caused by the junction capacitance of the rectifying diode, which results in favorable switching conditions for all devices.
Abstract: The power transistor in zero-current-switched quasiresonant converters (ZCS-QRCs) suffers from excessive voltage stress, and the converter regulation characteristics and stability are adversely affected by parasitic oscillations caused by the junction capacitance of the rectifying diode. A novel, multiresonant switch concept is proposed to overcome these problems. A unique multiresonant network arrangement results in absorption of all parasitic components, including transistor output capacitance, diode junction capacitance, and transformer leakage inductance, in the resonant circuit. This results in favorable switching conditions for all devices. Experimental results show that ZVS multiresonant converters are superior to ZVS-QRCs due to reduced transistor voltage stress and improved load range and stability. >
Citations
More filters
Journal ArticleDOI
02 Oct 1988
TL;DR: In this paper, three DC/DC converter topologies suitable for high power-density high power applications are presented, which operate in a soft-switched manner, making possible a reduction in device switching losses and an increase in switching frequency.
Abstract: Three DC/DC converter topologies suitable for high-power-density high-power applications are presented. All three circuits operate in a soft-switched manner, making possible a reduction in device switching losses and an increase in switching frequency. The three-phase dual-bridge converter proposed is shown to have the most favorable characteristics. This converter consists of two three-phase inverter stages operating in a high-frequency six-step mode. In contrast to existing single-phase AC-link DC/DC converters, lower turn-off peak currents in the power devices and lower RMS current ratings for both the input and output filter capacitors are obtained. This is in addition to smaller filter element values due to the higher-frequency content of the input and output waveforms. Furthermore, the use of a three-phase symmetrical transformer instead of single-phase transformers and a better utilization of the available apparent power of the transformer (as a consequence of the controlled output inverter) significantly increase the power density attainable. >

2,056 citations


Cites background from "Zero-voltage-switching multi-resona..."

  • ...Most of the soft switching converters reported in literature attempt to tackle one or more of the problems listed above, typically at the expense of substantially higher component stresses [4] [5]....

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Journal ArticleDOI
29 Jun 1992
TL;DR: In this paper, a class of zero voltage transition (ZVT) power converters is proposed in which both the transistor and the rectifier operate with zero voltage switching and are subjected to minimum voltage and current stresses.
Abstract: A class of zero voltage transition (ZVT) power converters is proposed in which both the transistor and the rectifier operate with zero voltage switching and are subjected to minimum voltage and current stresses. The boost ZVT-PWM converter is used as an example to illustrate the operation of these converters. A 300 kHz, 600 W ZVT-PWM boost, DC-DC converter, and a 100 kHz, 600 W power factor correction circuit using the ZVT-PWM technique and an insulated gate bipolar transistor (IGBT) device were breadboarded to show the operation of the proposed converters. It is shown that the circuit technology greatly improves the converter performance in terms of efficiency, switching noise, and circuit reliability. >

896 citations

Proceedings ArticleDOI
11 Mar 1990
TL;DR: In this article, a steady-state analysis is presented with complete characterization of the converter operation and the design procedures based on the analysis are presented and the various losses in the circuit assessed.
Abstract: A steady-state analysis is presented with complete characterization of the converter operation. A small-signal model of the converter is established. The design procedures based on the analysis are presented and the various losses in the circuit assessed. Critical design considerations for a high-power, high-voltage application are analyzed. The results of the analysis are verified using a high-voltage. 2 kW prototype. >

875 citations

Journal ArticleDOI
20 Jun 1993
TL;DR: In this article, a new family of zero-current transition (ZCT) pulsewidth-modulated (PWM) converters is proposed for high power applications where the minority-carrier semiconductor devices (such as IGBTs, BJTs, and MCTs) are predominantly used as the power switches.
Abstract: A new family of zero-current-transition (ZCT) pulse-width-modulated (PWM) converters are proposed. The new family of converters implements zero-current turn-off for power transistor(s) without increasing voltage/current stresses and operates at a fixed frequency. The proposed converters are deemed most suitable for high-power applications where the minority-carrier semiconductor devices (such as IGBTs, BJTs, and MCTs) are predominantly used as the power switches. Theoretical analysis is verified on a 100-kHz, 1-kW ZCT-PWM boost converter using an IGBT. >

384 citations

Proceedings ArticleDOI
21 Mar 2009
TL;DR: In this article, the scaling of magnetic component size with frequency is investigated, and it is shown that substantial miniaturization is possible with increased frequencies even considering material and heat transfer limitations.
Abstract: THIS paper explores opportunities and challenges in power conversion in the VHF frequency range of 30-300 MHz. The scaling of magnetic component size with frequency is investigated, and it is shown that substantial miniaturization is possible with increased frequencies even considering material and heat transfer limitations. Likewise, dramatic frequency increases are possible with existing and emerging semiconductor devices, but necessitate circuit designs that either compensate for or utilize device parasitics. We outline the characteristics of topologies and control methods that can meet the requirements of VHF power conversion, and present supporting examples from power converters operating at frequencies of up to 110 MHz.

371 citations

References
More filters
Proceedings ArticleDOI
24 Jun 1985
TL;DR: In this article, the concept of resonant switch was proposed to overcome the obstacles of higher switching stresses and switching losses in conventional switching converters, by incorporating additional Land C elements to shape device current and voltage waveforms, the desired zero-current switching property can be realized.
Abstract: In designing conventional switching converters, the effort to increase operating frequency in order to reduce weight, size and cost of magnetic and filter elements is constantly hampered by higher switching stresses and switching losses. To overcome these obstacles, the concept of resonant switch was proposed. By incorporating additional Land C elements to shape device current and voltage waveforms, the desired zero-current switching property can be realized which enables converters to operate in the megahertz range.

287 citations

Journal ArticleDOI
TL;DR: In this article, a quasi-resonant switch with inductor and capacitor elements to shape the semiconductor switch's current waveform is proposed. And a new host of quasi-reonant converter circuits have been derived, which can be operated in the megahertz range.
Abstract: In designing switching dc-dc converters, the effort to increase operating frequency to reduce weight, size, and cost of magnetic and filter elements is constantly hampered by higher switching stresses and switching losses. To overcome these obstacles, the concept of the "resonant switch" is proposed. By incorporating additional inductor and capacitor elements to shape the semiconductor switch's current waveform, a "zero-current switching" property can be realized. Based on the resonant switch technique, a new host of quasi-resonant converter circuits have been derived, which can be operated in the megahertz range.

272 citations

Proceedings ArticleDOI
23 Jun 1986
TL;DR: In this article, a novel resonant switch operating under the principle of zerovoltage switching is presented, which eliminates the switching loss and dv/dt noise due to discharging of MOSFET's junction capacitances and the reverse recovery of diodes, and enables the converters to operate at yet higher frequencies.
Abstract: A novel resonant switch operating under the principle of zero-voltage switching is presented. In contrast to the zero-current switching, this technique eliminates the switching loss and dv/dt noise due to the discharging of MOSFET's junction capacitances and the reverse recovery of diodes, and enables the converters to operate at yet higher frequencies.

239 citations

Proceedings ArticleDOI
01 Nov 1984
TL;DR: In searching for a general "zero-current-Switching" technique for DC-DC converters, the concept of resonant switches is developed and application of the resonant switch concept to conventional converters leads to the discovery of a host of new converter circuits.
Abstract: In searching for a general "zero-current-Switching" technique for DC-DC converters, the concept of resonant switches is developed. As a combination of switching device and LC network, the resonant switch offers advantages of quasi-sinusoidal current waveforms, zero switching stresses, zero switching losses, self-commutation, and reduced EMI. Furthermore, application of the resonant switch concept to conventional converters leads to the discovery of a host of new converter circuits.

163 citations

Journal ArticleDOI
TL;DR: In this paper, a buck and flyback zero-voltage-switched (ZVS) quasi-resonant converters (QRCs) operating above 5 MHz are proposed.
Abstract: Experimental results are presented for buck and flyback zero-voltage-switched (ZVS) quasi-resonant converters (QRCs) operating above 5 MHz. A design procedure for a buck ZVS QRC is proposed that minimizes voltage stress to the power MOSFET transistor while maintaining zero voltage switching for specified ranges of input voltage and load resistance. A quasi-resonant gate drive scheme is also proposed and implemented in a buck converter. The drive is simple and provides high switching speed. Power dissipation in the gate drive is substantially reduced due to the quasi-resonant operation. The ZVS QRC technique described is suitable for very-high-frequency operation due to its ability to reduce dynamic turn-on losses, Miller effect, dv/dt, and di//dt and can be applied in distributed onboard power supplies. >

145 citations