EPE Association: EPE 1995 - 10 - Lecture Session L3b: SINUSOIDAL POWER SUPPLIES

EPE 1995 - 10 - Lecture Session L3b: SINUSOIDAL POWER SUPPLIES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 10 - Lecture Session L3b: SINUSOIDAL POWER SUPPLIES

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   POWER FACTOR CORRECTION USING ZERO-CURRENT-SWITCHED QUASI-RESONANT CONVERTERS WITH VOLTAGE-FOLLOWER AND MULTIPLIER APPROACH CONTROL
By J. Sebastian; J.A. Martinez; M. W. Hernando; J. A. Cobos; F. Aldana [View]
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Abstract: In this paper we propose to study the use of Zero-Current-Switched Quasi-Resonant Converters as Power Factor Preregulators with two possible types of control: multiplier approach control and voltage-follower approach control. The former allows us to obtain almost ideal operation, but requires switching-frequency modulation each line half-cycle, input current feedfack loop and speclfic controller. The latter allows us high power factor (0.98) and low total harmonic distortion (15%) with a very simple control method which can be implemented with a standard controller.

   RESONANT DC/DC CONVERTER FOR TELECOMMUNICATION NETWORK
By C. Andrieu; J.P. Ferrieux; M. Rocher [View]
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Abstract: This paper deals with the AC-DC conversion in order to generate a regulated DC bus from the mains. Only the DC-DC part is analysed here. This converter delivers an isolated DC voltage (48-60 V) from the 385 V output voltage of a Power Factor Correction. The resonant topology chosen is a series-parallel symmetrical structure which operates in ZVS mode and an inductive half-bridge rectifier for high output current 60A.

   COST-EFFECTIVE PRACTICAL DEVELOPMENTS OF HIGH-PERFORMANCE 1kVA UPS WITH NEW SYSTEM CONFIGURATIONS AND THEIR SPECIFIC CONTROL IMPLEMENTATIONS
By K. Hirachi; H. Yamamoto; T. Matsui; S. Watanabe; M. Nakaoka [View]
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Abstract: The state-of-the art UPS which is composed of power conversion and inversion conditioning and processing configuration incorporating simple half-bridge active AC/DC converter and half-bridge PWM inverter circuits with no electrical isolation power stage has attracted special interest recently in computer and telecommunication systems. This UPS topology is highly cost-effective and suitable for its power conversion efficiency improvement and volumetric size and weight reduction. However, this attractive UPS topology has significant disadvantage that storage batteries have to be connected to the high DC link bus. In order to provide an acceptable DC voltage link with storage batteries, an improved type of application-specific UPS topology have been proposed and investigated from a practical point of view.
This paper presents a non-electrical isolated prototype of UPS circuit topologies incorporating converter circuits for battery bank interface and their related specific control strategies. The operating principles of power conversion topologies and control strategies are described. The experimental results of a unique and high-peIformance UPS topology with battery bank interface circuit are illustrated for 1kVA UPS application and discussed as compared with the latest conventional UPS with storage batteries connected to the high DC voltage bus.

   SINUSOIDAL INPUT POWER SUPPLY FOR ELECTRICAL TUBULAR HEAT EXCHANGER
By D. Pratmarty; H. Rivoalen [View]
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Abstract: This paper presents work carried out for the development of a power supply for a fluid heater using an electrical tubular heat exchanger. The characteristics of this new heating technology are discussed to identify the load to supply. The developed converter comprises a PWM rectifier to absorb sinusoidal line currents and an inverter that delivers square wave voltage to a 400 Hz transformer. Satisfactory results are obtained in opened loop for our heating application in spite of a slight decrease of the power factor at mid-power. Modelling of the rectifier is presented and simulation results are compared to experiments. In our case, it isn't necessary to control the response time of the DC-link current precisely because the time constant of the heating application is about a few minutes, so it is widely higher than the time constant of the power converter. However, PWM rectifiers can be used in many other applications and a non-linear control of DC-link current is also discussed. Simulation gives good results, there is no deterioration of harmonic pollution, the distortion ratio remains low. In order to improve the power factor at mid-power, a control method based on the phase shift of the PWM sinusoidal references used for the rectifier is presented. It gives very satisfactory results since a very significant improvement of the power factor is obtained.

EPE 1995 - 10 - Lecture Session L3b: SINUSOIDAL POWER SUPPLIES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 10 - Lecture Session L3b: SINUSOIDAL POWER SUPPLIES
	[return to parent folder]

	POWER FACTOR CORRECTION USING ZERO-CURRENT-SWITCHED QUASI-RESONANT CONVERTERS WITH VOLTAGE-FOLLOWER AND MULTIPLIER APPROACH CONTROL By J. Sebastian; J.A. Martinez; M. W. Hernando; J. A. Cobos; F. Aldana	[View] [Download]
Abstract: In this paper we propose to study the use of Zero-Current-Switched Quasi-Resonant Converters as Power Factor Preregulators with two possible types of control: multiplier approach control and voltage-follower approach control. The former allows us to obtain almost ideal operation, but requires switching-frequency modulation each line half-cycle, input current feedfack loop and speclfic controller. The latter allows us high power factor (0.98) and low total harmonic distortion (15%) with a very simple control method which can be implemented with a standard controller.

	RESONANT DC/DC CONVERTER FOR TELECOMMUNICATION NETWORK By C. Andrieu; J.P. Ferrieux; M. Rocher	[View] [Download]
Abstract: This paper deals with the AC-DC conversion in order to generate a regulated DC bus from the mains. Only the DC-DC part is analysed here. This converter delivers an isolated DC voltage (48-60 V) from the 385 V output voltage of a Power Factor Correction. The resonant topology chosen is a series-parallel symmetrical structure which operates in ZVS mode and an inductive half-bridge rectifier for high output current 60A.

	COST-EFFECTIVE PRACTICAL DEVELOPMENTS OF HIGH-PERFORMANCE 1kVA UPS WITH NEW SYSTEM CONFIGURATIONS AND THEIR SPECIFIC CONTROL IMPLEMENTATIONS By K. Hirachi; H. Yamamoto; T. Matsui; S. Watanabe; M. Nakaoka	[View] [Download]
Abstract: The state-of-the art UPS which is composed of power conversion and inversion conditioning and processing configuration incorporating simple half-bridge active AC/DC converter and half-bridge PWM inverter circuits with no electrical isolation power stage has attracted special interest recently in computer and telecommunication systems. This UPS topology is highly cost-effective and suitable for its power conversion efficiency improvement and volumetric size and weight reduction. However, this attractive UPS topology has significant disadvantage that storage batteries have to be connected to the high DC link bus. In order to provide an acceptable DC voltage link with storage batteries, an improved type of application-specific UPS topology have been proposed and investigated from a practical point of view. This paper presents a non-electrical isolated prototype of UPS circuit topologies incorporating converter circuits for battery bank interface and their related specific control strategies. The operating principles of power conversion topologies and control strategies are described. The experimental results of a unique and high-peIformance UPS topology with battery bank interface circuit are illustrated for 1kVA UPS application and discussed as compared with the latest conventional UPS with storage batteries connected to the high DC voltage bus.

	SINUSOIDAL INPUT POWER SUPPLY FOR ELECTRICAL TUBULAR HEAT EXCHANGER By D. Pratmarty; H. Rivoalen	[View] [Download]
Abstract: This paper presents work carried out for the development of a power supply for a fluid heater using an electrical tubular heat exchanger. The characteristics of this new heating technology are discussed to identify the load to supply. The developed converter comprises a PWM rectifier to absorb sinusoidal line currents and an inverter that delivers square wave voltage to a 400 Hz transformer. Satisfactory results are obtained in opened loop for our heating application in spite of a slight decrease of the power factor at mid-power. Modelling of the rectifier is presented and simulation results are compared to experiments. In our case, it isn't necessary to control the response time of the DC-link current precisely because the time constant of the heating application is about a few minutes, so it is widely higher than the time constant of the power converter. However, PWM rectifiers can be used in many other applications and a non-linear control of DC-link current is also discussed. Simulation gives good results, there is no deterioration of harmonic pollution, the distortion ratio remains low. In order to improve the power factor at mid-power, a control method based on the phase shift of the PWM sinusoidal references used for the rectifier is presented. It gives very satisfactory results since a very significant improvement of the power factor is obtained.