EPE Association: EPE 1999 - Topic 03c: Switched and Resonant-Mode Power Supplies

EPE 1999 - Topic 03c: Switched and Resonant-Mode Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1999 - Conference > EPE 1999 - Topic 03: POWER SUPPLIES > EPE 1999 - Topic 03c: Switched and Resonant-Mode Power Supplies

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   A High Power and High Efficiency Forward Converter by Using Non-Dissipative Snubbers
By M. Sanz; A. Llombart; F. Gómez; J. Sallán [View]
[Download]

Abstract: One of the main objectives on the design of power converters working at high frequencies is the reduction of the switching losses in the semiconductor devices, looking for a better efficiency or a further increase in the working frequency. The resonant techniques have been developed as a way of reducing these losses. This paper describes two DC/DC converters based on the forward scheme but including nondissipative snubbers that greatly reduce the switching losses, allowing an increase in both the switching frequency and the rated power. The operation of the converters is analysed, with a special emphasis on the energy balances. The paper analyses the working conditions of the switching devices, explaining the special features of the control strategy, derived from the resonant behaviour of the converter.

   A High-Frequency Switching Power Supply Control and Performance Analysis
By E. E. Aboul-Zahab; A.M. Zaki; O. Mahgoub; E.S. El-Wakil [View]
[Download]

Abstract: The series-parallel (LCC) resonant converter is well known as a topology, which combines the advantages of the series and the parallel resonant converters. In this paper, design and analysis of a 200W, 750 kHz switching power supply based on the LCC resonant converter will be presented. The control of the converter through switching frequency variation is presented.

   A Proposed of a Serial Regulator using a Soft Switching PWM AC/DC Full Bridge Converter
By J.C. de Oliveira; V.J. Farias; L.C. de Freitas; J.B. Vieira [View]
[Download]

Abstract: This paper presents a soft switching PWM AC/AC Full-Bridge circuit that will be employed at the development of a serial regulator to contribute supplying 20% of total load power when vi(t)= 180V and consuming 10% of the power supplied to load when vi(t)= 240 V. It does not contribute nothing when vi(t)= 220V. Principle of operation, theoretical analysis, design procedure are provided. The soft switching PWM AC/AC Full Bridge regulator has been validated by simulation results. The mathematical analysis and experimental results will be presented in the final version of this paper.

   Comparison Between Hard and Soft Switched Topologies for Low Volt...
By C. Carriero; F. Raina; G.F. Volpi [View]
[Download]

Abstract: When low-voltage low-power DC-DC converters are considered, as in typical space application, the advantages of soft switching techniques shall be considered in more detail. This paper provides a detailed comparison between multioutput soft and hard switched converters for space application, not only in term of efficiency or cost, but also considering the effect of harsh environment in space that is thermal cycling, EMC, Radiation and Reliability. Experimental results on the two most promising topologies will be provided.

   Digital State Space Controller for Series Resonant Converters
By T. Scheel; C. Hattrup [View]
[Download]

Abstract: Nowadays digital control becomes very interesting for the control of modern power supplies as prices of DSP's go down while at the same time their performance increases. Substantial for the design of digital controllers is an appropriate discrete model. In this paper a discrete state space model for a class of series resonant converters has been introduced. The model is valid both for continuous and discontinuous resonant currents. Based on this model a state space controller for a series resonant power supply has been designed. The resulting control scheme has been implemented on a DSP-platform and has been validated on a series resonant power supply.

   Dimming Control for High Intensity Discharge Lamp with Power Factor Correction
By B-R. Lin; Y-C. Hsieh [View]
[Download]

Abstract: This paper presents a high power factor high efficiency electronic ballast for high intensity discharge lamp (HID). The complete electronic ballast consists of a power factor corrected rectifier, a full-bridge inverter, and a resonant tank. The power factor pre-regulator generates a sinusoidal line current in phase with line voltage to get the high power factor and to improve the power quality. The phase-shift pulsewidth modulated scheme for full-bridge inverter is adopted to drive the metal halide lamp. In this control scheme, the constant switching frequency with variable duty cycle is used for dimming control. The series-resonant parallel-loaded circuit is used as a resonant tank. Finally, experimental results of a 70W MHL hardware prototype are presented to verify the characteristics of high power factor and dimming control of metal halide lamp (MHL).

   Electronic Transformer Using a Current-source Resonant Converter
By M. Castilla; L. García de Vicuña; M. López; J. matas; O. López [View]
[Download]

Abstract: This paper presents a new electronic transformer topology based on a current-source resonant converter. To control the switches, a fixed switching procedure is proposed in order to both achieve bi-directional power flow and make the output voltage have the same waveform and frequency as the line voltage. The transformer has a non-pulsating input current with low ac ripple and zero-voltage switching conditions in all the power devices.

   Interests and Limits of Quantum Series Resonant Converters for Mu...
By P. Bartholomeus [View]
[Download]

Abstract: A series resonant converter associated to a transformer and a rectifier imposes a constant ratio between input and output voltages when it works at the resonance frequency and can be called an "electronic transformer". If the output voltage varies, it can be necessary to limit the variations of the input voltage by using the quantum mode control. This article shows that this type of control is possible if the converter works in a continuous conduction mode. A simple model of the converter is presented and used to determine the limits of working of quantum converters which are linked to the minimal value of the current in the load.

   Resonant Mode PWM DC-DC Converter with a High-Voltage Transformer-Link and its Control Methods for Medical-Use X-Ray Power Supply
By J. M. Sun; S. P. Wang; T. Nishimura; M. Nakaoka [View]
[Download]

Abstract: Because of their tolerance of transformer nonidealities, resonant converters appearwell-suited to high-voltage applications. Conventional dc power supplies are normally designed for constant power applications and do not perform well under the extremely wide range of load variations involved in fast and precisely driving a resistive X-ray tube load to emit x-rays over wide output dc voltage range. In this paper, a high-voltage DC power supply specially designed for a medical-use X ray power generator application that uses a series-resonant circuit topology, a high frequency high-voltage transformer, a high-voltage diode rectifier at dc high-voltage output-side, an optimal digital servo and repretitive learning control scheme has newly been developed. The superior output dc waveforms with fast rise times and low ripple factor over extremely wide output range, which are the most important specifications in evaluating a complete x-ray power generator, have been performed. The principles of operation and performances are illustrated and varified on a experimental circuit and are in good agreement with the simulation.

   Silent Discharge-based Ozonizer Using Pulse Density Modulated High-Frequency Inverter
By S. P. Wang; T. Nishimura; Y. Konishi; M. Nakaoka [View]
[Download]

Abstract: In this paper, the voltage-fed series compensated inductor type of load-resonant high-frequency inverter is originally presented for driving a newly-developed silent discharge ozone generating tube. The effective power regulation scheme of this ozonizer is proposed, that is based on PDM (Pulse Density Modulation) related PWM strategy due to DSP implementation. the effectiveness of this inverter type ozonizer in accordance with the simulation and the experiment.

EPE 1999 - Topic 03c: Switched and Resonant-Mode Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1999 - Conference > EPE 1999 - Topic 03: POWER SUPPLIES > EPE 1999 - Topic 03c: Switched and Resonant-Mode Power Supplies
	[return to parent folder]

	A High Power and High Efficiency Forward Converter by Using Non-Dissipative Snubbers By M. Sanz; A. Llombart; F. Gómez; J. Sallán	[View] [Download]
Abstract: One of the main objectives on the design of power converters working at high frequencies is the reduction of the switching losses in the semiconductor devices, looking for a better efficiency or a further increase in the working frequency. The resonant techniques have been developed as a way of reducing these losses. This paper describes two DC/DC converters based on the forward scheme but including nondissipative snubbers that greatly reduce the switching losses, allowing an increase in both the switching frequency and the rated power. The operation of the converters is analysed, with a special emphasis on the energy balances. The paper analyses the working conditions of the switching devices, explaining the special features of the control strategy, derived from the resonant behaviour of the converter.

	A High-Frequency Switching Power Supply Control and Performance Analysis By E. E. Aboul-Zahab; A.M. Zaki; O. Mahgoub; E.S. El-Wakil	[View] [Download]
Abstract: The series-parallel (LCC) resonant converter is well known as a topology, which combines the advantages of the series and the parallel resonant converters. In this paper, design and analysis of a 200W, 750 kHz switching power supply based on the LCC resonant converter will be presented. The control of the converter through switching frequency variation is presented.

	A Proposed of a Serial Regulator using a Soft Switching PWM AC/DC Full Bridge Converter By J.C. de Oliveira; V.J. Farias; L.C. de Freitas; J.B. Vieira	[View] [Download]
Abstract: This paper presents a soft switching PWM AC/AC Full-Bridge circuit that will be employed at the development of a serial regulator to contribute supplying 20% of total load power when vi(t)= 180V and consuming 10% of the power supplied to load when vi(t)= 240 V. It does not contribute nothing when vi(t)= 220V. Principle of operation, theoretical analysis, design procedure are provided. The soft switching PWM AC/AC Full Bridge regulator has been validated by simulation results. The mathematical analysis and experimental results will be presented in the final version of this paper.

	Comparison Between Hard and Soft Switched Topologies for Low Volt... By C. Carriero; F. Raina; G.F. Volpi	[View] [Download]
Abstract: When low-voltage low-power DC-DC converters are considered, as in typical space application, the advantages of soft switching techniques shall be considered in more detail. This paper provides a detailed comparison between multioutput soft and hard switched converters for space application, not only in term of efficiency or cost, but also considering the effect of harsh environment in space that is thermal cycling, EMC, Radiation and Reliability. Experimental results on the two most promising topologies will be provided.

	Digital State Space Controller for Series Resonant Converters By T. Scheel; C. Hattrup	[View] [Download]
Abstract: Nowadays digital control becomes very interesting for the control of modern power supplies as prices of DSP's go down while at the same time their performance increases. Substantial for the design of digital controllers is an appropriate discrete model. In this paper a discrete state space model for a class of series resonant converters has been introduced. The model is valid both for continuous and discontinuous resonant currents. Based on this model a state space controller for a series resonant power supply has been designed. The resulting control scheme has been implemented on a DSP-platform and has been validated on a series resonant power supply.

	Dimming Control for High Intensity Discharge Lamp with Power Factor Correction By B-R. Lin; Y-C. Hsieh	[View] [Download]
Abstract: This paper presents a high power factor high efficiency electronic ballast for high intensity discharge lamp (HID). The complete electronic ballast consists of a power factor corrected rectifier, a full-bridge inverter, and a resonant tank. The power factor pre-regulator generates a sinusoidal line current in phase with line voltage to get the high power factor and to improve the power quality. The phase-shift pulsewidth modulated scheme for full-bridge inverter is adopted to drive the metal halide lamp. In this control scheme, the constant switching frequency with variable duty cycle is used for dimming control. The series-resonant parallel-loaded circuit is used as a resonant tank. Finally, experimental results of a 70W MHL hardware prototype are presented to verify the characteristics of high power factor and dimming control of metal halide lamp (MHL).

	Electronic Transformer Using a Current-source Resonant Converter By M. Castilla; L. García de Vicuña; M. López; J. matas; O. López	[View] [Download]
Abstract: This paper presents a new electronic transformer topology based on a current-source resonant converter. To control the switches, a fixed switching procedure is proposed in order to both achieve bi-directional power flow and make the output voltage have the same waveform and frequency as the line voltage. The transformer has a non-pulsating input current with low ac ripple and zero-voltage switching conditions in all the power devices.

	Interests and Limits of Quantum Series Resonant Converters for Mu... By P. Bartholomeus	[View] [Download]
Abstract: A series resonant converter associated to a transformer and a rectifier imposes a constant ratio between input and output voltages when it works at the resonance frequency and can be called an "electronic transformer". If the output voltage varies, it can be necessary to limit the variations of the input voltage by using the quantum mode control. This article shows that this type of control is possible if the converter works in a continuous conduction mode. A simple model of the converter is presented and used to determine the limits of working of quantum converters which are linked to the minimal value of the current in the load.

	Resonant Mode PWM DC-DC Converter with a High-Voltage Transformer-Link and its Control Methods for Medical-Use X-Ray Power Supply By J. M. Sun; S. P. Wang; T. Nishimura; M. Nakaoka	[View] [Download]
Abstract: Because of their tolerance of transformer nonidealities, resonant converters appearwell-suited to high-voltage applications. Conventional dc power supplies are normally designed for constant power applications and do not perform well under the extremely wide range of load variations involved in fast and precisely driving a resistive X-ray tube load to emit x-rays over wide output dc voltage range. In this paper, a high-voltage DC power supply specially designed for a medical-use X ray power generator application that uses a series-resonant circuit topology, a high frequency high-voltage transformer, a high-voltage diode rectifier at dc high-voltage output-side, an optimal digital servo and repretitive learning control scheme has newly been developed. The superior output dc waveforms with fast rise times and low ripple factor over extremely wide output range, which are the most important specifications in evaluating a complete x-ray power generator, have been performed. The principles of operation and performances are illustrated and varified on a experimental circuit and are in good agreement with the simulation.

	Silent Discharge-based Ozonizer Using Pulse Density Modulated High-Frequency Inverter By S. P. Wang; T. Nishimura; Y. Konishi; M. Nakaoka	[View] [Download]
Abstract: In this paper, the voltage-fed series compensated inductor type of load-resonant high-frequency inverter is originally presented for driving a newly-developed silent discharge ozone generating tube. The effective power regulation scheme of this ozonizer is proposed, that is based on PDM (Pulse Density Modulation) related PWM strategy due to DSP implementation. the effectiveness of this inverter type ozonizer in accordance with the simulation and the experiment.