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D.F. da Cruz

Bio: D.F. da Cruz is an academic researcher. The author has contributed to research in topics: Pulse-width modulation & Inverter. The author has an hindex of 1, co-authored 2 publications receiving 47 citations.

Papers
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Proceedings ArticleDOI
07 Mar 1993
TL;DR: In this article, a buck power converter using a zero current switching zero voltage switching PWM (ZCS-ZVS-PWM) cell for high switching frequency and high power operation is presented.
Abstract: A DC-to-DC power converter using a zero current switching zero voltage switching PWM (ZCS-ZVS-PWM) cell for high switching frequency and high power operation is presented. The proposed cell consists of only one main switch, plus an auxilliary switch, with ZVS and ZCS switching characteristics, respectively. These switches, associated with a resonant inductor and capacitor, yield zero voltage and zero current switching, providing highly efficient operating conditions for a wide range of power at high switching frequency. Converter control is accomplished by using the PWM technique, with constant frequency operation. A complete analysis of the operating principles, including output characteristics, relevant equations, state space phase, simulation, and experimental results for the buck power converter, is presented. >

47 citations

Proceedings ArticleDOI
04 Oct 1992
TL;DR: In this paper, the use of the lossless commutation pulse width modulation (PWM) source feeding resonant disconnecting circuit (LC-PWM-SF-RDC) cell in the DC link and DC-DC power converter topologies is proposed.
Abstract: The use of the lossless commutation pulse width modulation (PWM) source feeding resonant disconnecting circuit (LC-PWM-SF-RDC) cell in the DC link and DC-DC power converter topologies is proposed. The most important property of this cell in DC-DC applications is the ability to regulate output power and voltage by PWM, with constant operating frequency, and without sacrificing the lossless commutation. In the case of a DC link application the use of the LC-PWM-SF-RDC cell allows the inverter legs to be switched in low frequency, while the resonant DC link circuit is switched in high frequency by using conventional PWM strategies for DC-DC power converters. Operation principles, output characteristics, relevant equations, simulation and experimental results are presented for use of this cell in a buck DC-DC power converter. The simulation results for a DC link inverter are presented. >

Cited by
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Journal ArticleDOI
TL;DR: In this paper, a new zero-voltage-switching (ZVS) bidirectional dc-dc converter is proposed for medium and high power applications especially for auxiliary power supply in fuel cell vehicles and power generation where the high power density, low cost, lightweight and high reliability power converters are required.
Abstract: This paper presents a new zero-voltage-switching (ZVS) bidirectional dc-dc converter. Compared to the traditional full and half bridge bidirectional dc-dc converters for the similar applications, the new topology has the advantages of simple circuit topology with no total device rating (TDR) penalty, soft-switching implementation without additional devices, high efficiency and simple control. These advantages make the new converter promising for medium and high power applications especially for auxiliary power supply in fuel cell vehicles and power generation where the high power density, low cost, lightweight and high reliability power converters are required. The operating principle, theoretical analysis, and design guidelines are provided in this paper. The simulation and the experimental verifications are also presented.

684 citations

Journal ArticleDOI
TL;DR: In this article, a new family of active auxiliary circuits that allow the power switch in single switch, pulsewidth modulated converters to operate with zero-voltage switching is proposed, which is an improvement over previous proposed auxiliary circuits where either the auxiliary switch operates with a hard turnoff or the circuit itself increases the peak current stresses of the main switch.
Abstract: A new family of active auxiliary circuits that allow the power switch in single switch, pulsewidth modulated converters to operate with zero-voltage switching is proposed in this paper. The main feature of an auxiliary circuit belonging to this family is that the auxiliary switch can operate with a zero-current switching turn-on and turn-off without increasing the peak current stresses of the main switch. This is an improvement over previous proposed auxiliary circuits where either the auxiliary switch operates with a hard turn-off or the circuit itself increases the peak stresses of the main switch. In this paper, the fundamental principles behind the proposed family of active auxiliary circuits are explained. Based on these principles, an example auxiliary circuit is systematically derived and presented along with several other auxiliary circuits belonging to the new family. The operation of a boost converter operating with the example auxiliary circuit is discussed in detail, and general guidelines for the design and implementation of auxiliary circuits belonging to the new family are given. The feasibility of the example auxiliary circuit is confirmed by experimental results obtained from a 500-W, 100-kHz boost converter laboratory prototype.

87 citations

Proceedings ArticleDOI
20 Jun 1994
TL;DR: A new class of commutation self-resonant PWM power convertor that overcomes this great disadvantage as well as being able to operate without switching losses in high switching frequencies for a wide line and load range is presented.
Abstract: Obtaining soft-switching operation for PWM power converters, except for a few cases, has required either high switch voltage stresses or high switch current stresses, or both. This paper presents a new class of commutation self-resonant PWM power convertor that overcomes this great disadvantage as well as being able to operate without switching losses in high switching frequencies for a wide line and load range. The circuit diagram and the phase-plane of each power converter of a family of such converters are also presented. In order to emphasize the principal characteristics of these new converters, a study, including experimental results, is carried out in detail for the buck and zeta converters. >

77 citations

Journal ArticleDOI
20 Jun 1993
TL;DR: In this paper, a buck DC-DC power converter using a novel lossless commutation cell for high switching frequency and high power operation is presented, which consists of a main switch and an auxiliary switch, with ZVS (zero voltage switched) and ZCS (zero current switched) switching characteristics, respectively.
Abstract: A buck DC-DC power converter using a novel lossless commutation cell for high switching frequency and high power operation is presented. The proposed cell consists of a main switch and an auxiliary switch, with ZVS (zero voltage switched) and ZCS (zero current switched) switching characteristics, respectively. The converter control using this cell is realized by the PWM technique, with constant switching frequency operation. The complete operation principles, theoretical analysis, relevant equations, state space phase, simulation, and experimental results for the buck converter are presented. >

66 citations

Journal ArticleDOI
TL;DR: A buck pulsewidth modulation converter, where the DC voltage conversion ratio has a quadratic dependence on duty cycle, providing a large step-down, and soft switching is attained by introducing two resonant networks, providing highly efficient operating conditions for a wide load range at high switching frequency.
Abstract: High switching frequency associated with soft commutation techniques is a new trend in switching converters. Following this trend, the authors present a buck pulsewidth modulation converter, where the DC voltage conversion ratio has a quadratic dependence on duty cycle, providing a large step-down. By introducing two resonant networks, soft switching is attained, providing highly efficient operating conditions for a wide load range at high switching frequency. Contrary to most of the converters that apply soft-switching techniques, the switches presented are not subjected to high switch voltage or current stresses and, consequently, present low conduction losses. The authors present, for this converter, the principle of operation, theoretical analysis, relevant equations and simulation and experimental results.

60 citations