EPE Association: EPE 1997 – 31: Dialogue Session DS3d: HIGH FREQUENCY POWER CONVERTERS AND POWER FACTOR CORRECTION

EPE 1997 – 31: Dialogue Session DS3d: HIGH FREQUENCY POWER CONVERTERS AND POWER FACTOR CORRECTION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 31: Dialogue Session DS3d: HIGH FREQUENCY POWER CONVERTERS AND POWER FACTOR CORRECTION

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   SINGLE PHASE LOW DISTORTION DC/AC-INVERTER WITH HIGH BANDWIDTH TO SWITCHING FREQUENCY RATIO
By N. Anderskouv; K. Nielsen; M. A. E. Andersen [View]
[Download]

Abstract: This paper addresses the realisation of high performance, high efficiency single phase DC/AC·inverter. Both two level and three level PWM are analysed to find the optimal modulation method for an H-bridge output stage. Together with both current and voltage feedback, certain advantages are obtained compared to conventional topologies. An audio power amplifier application is presented. A 200W/8ohm prototype has shown convincing performance with THD+N<0,1%, a 113dB dynamic range and ail efficiency approaching 90% at higher output powers.

   AN AC-DC CONVERTER WITH HIGH-QUALITY INPUT WAVEFORMS AND VERY LOW SWITCHING LOSSES
By M. Lopez; L. Garcia de Vicuna; M. Castilla; J. Matas [View]
[Download]

Abstract: This paper presents a unity-power-factor rectifier based on a Quantum Parallel Resonant Converter. This converter operates at resonant frequency and switching at zero resonant voltage. An averaged large-signal model for this converter is derived. This model is used for designing a multi-input sliding mode fast controller.

   BOOST CONVERTER AS A MEDIUM FOR ADAPTIVE SHUT DOWN CONTROL
By T. Suntio; S. Suur-Askola; T.Laurinen [View]
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Abstract: The boost converter of a switched mode rectifier contains as an inherent feature capability to operate at wide input voltage range. Most often a rectifier with universal input voltage range is not economically viable solution when mainly used in a single voltage environment. Switched mode rectifiers are commonly used to supply power for Telecom systems having extremely high reliability requirements. The number of occurrence of input supply interruptions can adversly affect the system reliability. The methods are studied and solution suggested by means of which the actual number of interruptions experienced by Telecom system can be substantially reduced by utilizing boost converter capability in an economical wcy.

   A NOVEL DIGITAL CONTROL SCHEME FOR A SINUSOIDAL INPUT SINGLE PHASE RECTIFIER
By M. Ohshima; E. Masada [View]
[Download]

Abstract: This paper proposes a novel constantly-sampled PWM scheme for a single phase boost-type switch mode rectifier of non-uniform mains configuratipn, in which only two active power devices are employed. As based on constantly sampled data the proposed PWM scheme is well fitted to digital control implementation. It is derived mathematically that the PWM scheme maintains the ac input current to be sinusoidal and almost of a unity power factor. Instantaneous control of ac current waveform is also proved mathematically to be stable even in case of an abrupt load change. As an example, a design procedure for a dc180V, 200W rectifier with ac 50Hz 100V input in which the gate signals are generated by the proposed PWM scheme is presented. Digital PSpice simulation verifies its operational characteristics to be in good agreement with theoretical examination.

   A NEW TOPOLOGY FOR PARALLELING THREE PHASE HALF WAVE RECTIFIERS WITH A HIGH POWER FACTOR AND SINUSOIDAL INPUT CURRENTS
By V. F. Pires; J. F. Silva [View]
[Download]

Abstract: The parallel association of three phase half wave thyristor rectifiers is used for low voltage and high current applications, in order to reduce conduction losses and maximise efficiency. In this paper, a new topology for this type of converters is presented, which provide sinusoidal input currents and high power factor. Simulation and experimental results in open loop and closed loop are presented and analysed.

   SOFT-SWITCHED PWM HIGH-FREQUENCY LOAD-RESONANT INVERTER WITH POWER FACTOR
By S.P. Wang; M. Nakaoka; K. Izaki; I. Hirota; H. Yamashita; H. Omori [View]
[Download]

Abstract: This paper presents a novel type of voltage-fed quasi-load resonant half-bridge IGBT inverter operating at constant frequency variable power (CFVP) regulation scheme which is more suitable and acceptable for new high-frequency high-power induction-heated (IH) cooking appliances. This application-specific high-frequency inverter using a new generation specially-designed IGBTs can efficiently operate under a principle of ZVS-PWM control strategy. The operating principle of a new inverter circuit is presented together with its power regulation characteristics on the basis of its computer-aided simulation analysis and its experimental results. The steady-state characteristics of cost effective quasi-resonant inverter developed for high-frequency IH cooking appliances such as multi-burner type IH cooker are discussed herein from a practical point of view.

   A UNITY POWER FACTOR PWM VOLTAGE RECTIFIER UNDER NON-SINUSOIDAL AND UNBALANCED CONDITIONS
By P. Verdelho; G.D. Marques [View]
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Abstract: This paper presents a unity power factor PWM Voltage rectifier. Three control systems are analysed. The rectifier input currents are sinusoidal functions. However under non-sinusoidal and unbalanced mains voltages conditions the rectifier input currents become non-sinusoidal and unbalanced functions. leading to the distortion increase on the mains. These three control systems are compared under those mains voltages conditions. Expressions for the controllers synthesis are derived.

EPE 1997 – 31: Dialogue Session DS3d: HIGH FREQUENCY POWER CONVERTERS AND POWER FACTOR CORRECTION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 31: Dialogue Session DS3d: HIGH FREQUENCY POWER CONVERTERS AND POWER FACTOR CORRECTION
	[return to parent folder]

	SINGLE PHASE LOW DISTORTION DC/AC-INVERTER WITH HIGH BANDWIDTH TO SWITCHING FREQUENCY RATIO By N. Anderskouv; K. Nielsen; M. A. E. Andersen	[View] [Download]
Abstract: This paper addresses the realisation of high performance, high efficiency single phase DC/AC·inverter. Both two level and three level PWM are analysed to find the optimal modulation method for an H-bridge output stage. Together with both current and voltage feedback, certain advantages are obtained compared to conventional topologies. An audio power amplifier application is presented. A 200W/8ohm prototype has shown convincing performance with THD+N<0,1%, a 113dB dynamic range and ail efficiency approaching 90% at higher output powers.

	AN AC-DC CONVERTER WITH HIGH-QUALITY INPUT WAVEFORMS AND VERY LOW SWITCHING LOSSES By M. Lopez; L. Garcia de Vicuna; M. Castilla; J. Matas	[View] [Download]
Abstract: This paper presents a unity-power-factor rectifier based on a Quantum Parallel Resonant Converter. This converter operates at resonant frequency and switching at zero resonant voltage. An averaged large-signal model for this converter is derived. This model is used for designing a multi-input sliding mode fast controller.

	BOOST CONVERTER AS A MEDIUM FOR ADAPTIVE SHUT DOWN CONTROL By T. Suntio; S. Suur-Askola; T.Laurinen	[View] [Download]
Abstract: The boost converter of a switched mode rectifier contains as an inherent feature capability to operate at wide input voltage range. Most often a rectifier with universal input voltage range is not economically viable solution when mainly used in a single voltage environment. Switched mode rectifiers are commonly used to supply power for Telecom systems having extremely high reliability requirements. The number of occurrence of input supply interruptions can adversly affect the system reliability. The methods are studied and solution suggested by means of which the actual number of interruptions experienced by Telecom system can be substantially reduced by utilizing boost converter capability in an economical wcy.

	A NOVEL DIGITAL CONTROL SCHEME FOR A SINUSOIDAL INPUT SINGLE PHASE RECTIFIER By M. Ohshima; E. Masada	[View] [Download]
Abstract: This paper proposes a novel constantly-sampled PWM scheme for a single phase boost-type switch mode rectifier of non-uniform mains configuratipn, in which only two active power devices are employed. As based on constantly sampled data the proposed PWM scheme is well fitted to digital control implementation. It is derived mathematically that the PWM scheme maintains the ac input current to be sinusoidal and almost of a unity power factor. Instantaneous control of ac current waveform is also proved mathematically to be stable even in case of an abrupt load change. As an example, a design procedure for a dc180V, 200W rectifier with ac 50Hz 100V input in which the gate signals are generated by the proposed PWM scheme is presented. Digital PSpice simulation verifies its operational characteristics to be in good agreement with theoretical examination.

	A NEW TOPOLOGY FOR PARALLELING THREE PHASE HALF WAVE RECTIFIERS WITH A HIGH POWER FACTOR AND SINUSOIDAL INPUT CURRENTS By V. F. Pires; J. F. Silva	[View] [Download]
Abstract: The parallel association of three phase half wave thyristor rectifiers is used for low voltage and high current applications, in order to reduce conduction losses and maximise efficiency. In this paper, a new topology for this type of converters is presented, which provide sinusoidal input currents and high power factor. Simulation and experimental results in open loop and closed loop are presented and analysed.

	SOFT-SWITCHED PWM HIGH-FREQUENCY LOAD-RESONANT INVERTER WITH POWER FACTOR By S.P. Wang; M. Nakaoka; K. Izaki; I. Hirota; H. Yamashita; H. Omori	[View] [Download]
Abstract: This paper presents a novel type of voltage-fed quasi-load resonant half-bridge IGBT inverter operating at constant frequency variable power (CFVP) regulation scheme which is more suitable and acceptable for new high-frequency high-power induction-heated (IH) cooking appliances. This application-specific high-frequency inverter using a new generation specially-designed IGBTs can efficiently operate under a principle of ZVS-PWM control strategy. The operating principle of a new inverter circuit is presented together with its power regulation characteristics on the basis of its computer-aided simulation analysis and its experimental results. The steady-state characteristics of cost effective quasi-resonant inverter developed for high-frequency IH cooking appliances such as multi-burner type IH cooker are discussed herein from a practical point of view.

	A UNITY POWER FACTOR PWM VOLTAGE RECTIFIER UNDER NON-SINUSOIDAL AND UNBALANCED CONDITIONS By P. Verdelho; G.D. Marques	[View] [Download]
Abstract: This paper presents a unity power factor PWM Voltage rectifier. Three control systems are analysed. The rectifier input currents are sinusoidal functions. However under non-sinusoidal and unbalanced mains voltages conditions the rectifier input currents become non-sinusoidal and unbalanced functions. leading to the distortion increase on the mains. These three control systems are compared under those mains voltages conditions. Expressions for the controllers synthesis are derived.