EPE Association: EPE 1995 - 34 - Dialogue Session DS3b: Electronic Power Supply Systems (I)

EPE 1995 - 34 - Dialogue Session DS3b: Electronic Power Supply Systems (I)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 34 - Dialogue Session DS3b: Electronic Power Supply Systems (I)

   [return to parent folder]

   LOW POWER AND LOW OUTPUT VOLTAGE (3.3V) AC/DC CONVERTER WITH POWER FACTOR CORRECTION
By J. A. Cobos; O. Garcia; J. Uceda; J. Sebastian; S. Ollero; E. de la Cruz [View]
[Download]

Abstract: A new structure to obtain low output voltage (3.3 V) from the AC mains is proposed in this paper. The power conversion is carried out in two stages. The first one is in charge of the power factor correction (PFC), whereas the second one provides low output voltage (3.3V) with very high efficiency, by means of self driven synchronous rectification in a half bridge converter with complementary control.

   VARIABLE AND UNBALANCED THREE-PHASES LOAD CONNECTED TO AN DC/AC CONVERTER, CONTROLLED BY ORIENTED FIELD THEORY
By J. A. Dominguez Vazquez; I. Valle Gonzalez; S. Lorenzo Matilla; J. M. Ruiz Gonzalez [View]
[Download]

Abstract: Usually loads attached to DC/AC converters are unbalanced and/or variables, preventing the application of Oriented Field Theory (O.F.T.) and loosing its advantages. In this paper, a possible solution is exposed.

   NEW FAST-CHARGE METHODS OF NiCd/NiMH BATTERIES: UNIVERSAL BATTERY CHARGER / DISCHARGER FOR TESTING
By M. Gonzalez; J. Lopez; E. Lopez; M. A. Perez [View]
[Download]

Abstract: The design of a universal NiCd/NiMH battery charger/discharger is presented in this paper. The topologies proposed provide all type of charging tests although the main task of the charger is to implement fast-charge techniques. With this system the complete charging/discharging process is monitored and automatically controlled. In this way, research on how battery performance is modified as a function of method is facilitated.

   An Analysis of a Large Air Gap Transformer by Using a Transcutaneous Energy Transmission
By Toshi Hiro Nishimura; Tetsuji Eguchi; Takeshi Inoue; Katsuya Hirachi; Yasushi Maejima; Masao Saito [View]
[Download]

Abstract: A flat transformer for a resonant converter that transfers several W of power' across a large variable human skin gap is presented and built. The converter can power a novel cardiac pacemaker battery through intact skin by using a novel transformer with an air gap, which is 10 mm - 15 mm. The integrated equation analysis for a presumption on magnetic flux distribution in the transformer is presented.

   HIGH FREQUENCY SUPPLY SYSTEM WITH POWER FACTOR CORRECTION FOR HALOGEN CYCLE LAMPS
By C. Blanco; J. M. Alonso; P. Villegas; E. Lopez; M. Rico [View]
[Download]

Abstract: A low cost and robust high frequency supply system for low power halogen cycle lamps based on a self-oscillating half bridge inverter is described at this paper. With respect to a 50 Hz transformer, weight and size have been minimized. Moreover a high power factor, more than 0.9, has been achieved, and the circuit is reliable and flexible.

   A TRIPORT UPS DESIGN WITH BIPOLAR POWER TRANSISTOR ARRAY BASED AC LINE VOLTAGE REGULATION
By Nihal Kulratna; H. W. Sampath [View]
[Download]

Abstract: Use of a triport technique for a UPS of a low VA rating could have its own merits due to easy isolation, simplicity of inverter and other characteristics. In the past, use of a series bipolar power transistor array for AC line voltage regulation has been discussed and the triport configuration of a low VA rating UPS could benefit from this AC regulation technique. Article outlines the design approach and the experimental results achieved in designing such a prototype system of 150 VA rating.

   PARALLEL CONNECTION OF POWER RECTIFIER MODULES WITH VERY HIGH POWER FACTOR FOR RAILWAY APPLICATIONS
By A. Lohner; O. Franz; M. Vomfelde [View]
[Download]

Abstract: In this paper a new 35 kW one-phase rectifier module with very high efficiency is presented. By use of a special favourable method of current-regulated modulation it is possible to achieve an input power-factor near to one. Furthermore it is possible to connect several modules in parallel to increase the total power. This concept allows to divide the total installed power into several small modules and distribute them over the given place, if there is not enough place to install one large rectifier. In case of connecting several modules in parallel it is not necessary to connect its control circuits. This feature reduces the connecting expense. The presented rectifier module was designed to be used in modem high-speed trains to supply all inverters, especially the air conditioning inverter, from the 50 Hz or the 16 2/3 Hz 380V one-phase AC network.

   QUASI-SQUARE-WAVE CONVERTER FOR AEROSPACE APPLICATIONS
By R. I. Gregory; A. J. Forsyth [View]
[Download]

Abstract: The steady-state conversion characteristics of the Quasi-Square-Wave step-up converter are derived and presented. Variation of the performance characteristics with specification is discussed and the most favourable operating conditions identified. A design of a 150W 80V prototype is presented operating from 24-50V at 700kHz, the full-load efficiency is between 82% and 87%. Practical results from this converter are compared with the theoretical predictions and good agreement is obtained.

   A METHOD OF SYNCHRONIZING MICROPROCESSOR-CONTROLLED PULSE WIDTH MODULATION INVERTERS WITH THE MAINS VOLTAGE
By Jovan Z. Bebic; Marko V. Jankovic [View]
[Download]

Abstract: This paper presents a method of synchronizing microprocessor controlled pulse width modulation (PWM) inverters with the line voltage, required for the proper operation of static-switch in UPS systems. Proposed solution is based on a fully digital phase-locked loop (PLL), implemented on a low-performance 8-bit micro controller - 80535. Proposed method has been employed to synchronize 2.5kHz PWM inverter with the line voltage. Results are promissing.

   A NOVEL UNINTERRUPTIBLE POWER SUPPLY SYSTEM WITH SINUSOIDAL INPUT-OUTPUT CHARACTERISTICS AND SIMPLIFIED CONTROL CIRCUIT
By G. Ioannidis; E. Xanthoulis; S.N. Manias [View]
[Download]

Abstract: In this paper a novel UPS topology is presented and analysed. The proposed UPS consists of three power stages. The first stage is a SMR which utilises a buck-boost converter for active power correction, the second stage is a high frequency Inverter that provides ohmic isolation and voltage matching and last, the third stage is a low frequency SPWM inverter. Moreover, the proposed UPS exhibits sinusoidal input/output characteristics, high power density and simple control circuit.

   MONOPHASE SUPER RESONANT POWER CONVERTER WITH PULSE AMPLITUDE MODULATION
By R. M. Paulussen; M. P. N. van Weesenbeeck; J. B. Klaassens [View]
[Download]

Abstract: A super-resonant monophase DC-AC power converter which features controllable four-quadrant operation capability is presented. The controlled di/dt during turn-on eliminates turn-on losses. Zero-voltage switching is applied to assist turn-off for the forced commutated devices. Output current control and output voltage control is achieved by Pulse Amplitude Modulation (PAM) in combination with Pulse Position Modulation (PPM) of the resonant current pulses. PAM significantly improves the required modulation index for the Pulse Position Modulation. The quasi-constant frequency operation enhances the spectral performance and facilitates the design of input and output filters. A experimental DC-AC converter is built for experimental validation.

   PARALLEL OPERATION OF STANDARD UNINTERRUPTIBLE POWER SUPPLIES BY REACTIVE POWER CONTROL
By A. P. Martins; A. S. Carvalho; A. S. Araujo [View]
[Download]

Abstract: The parallel operation of UPS systems can be based on different control methods: active and reactive power control; voltage and frequency droop; instantaneous control of the modulation pulses. This paper presents the results of a control system for parallel operation of UPSs implementing reactive power control. The relative phase between the inverters is constant. Open and closed loop simulated characteristics are presented validating this approach. A digital PI controller is designed based on the continuous equivalent. Simulation results along with experimental ones are presented at the controller level as at the power system. The overall control system is implemented in a simple and low cost platform.

   CONCEPTS FOR AN UNCONVENTIONAL UNINTERRUPTIBLE POWER SUPPLY USING REVERSIBLE CONVERTERS
By F. Morin; J-P. Caron; J-P. Hautier [View]
[Download]

Abstract: This paper presents the basic configuration and the control of an unconventionnal off-line standby uninterruptible power supply (UPS); both its converters, connected in series between AC mains supply and battery, are entirely reversible. A switching single-phase bridge ensures the double-fonction: PWM rectifier with an input current spectral optimization and PWM Inverter providing a quasi sinewave voltage to the load. The second converter is in fact a three-pole switch, also called commutation cell, working as a step-down/step-up chopper. It is controlled to adapt the battery voltage level to a capacitor's level; this last component is acting as a buffer between both converters. The authors use a new formalism, Hautier and Guillaud (1), for modeling and research of control algorithms which are illustrated by simulated results.

   PARK VECTOR BASED SLIDING MODE CONTROL OF UPS WITH UNBALANCED LOAD
By P. Korondi; H. Hashimoto; F. Harashima; G. Nemeth [View]
[Download]

Abstract: In this paper an inverter is taken to be a member of Variable Structure System (VSS). Park vector based variable structure control (VSC) methods are studied. A modified definition of the Park vector is introduced to handle the effect of zero phase-sequence component caused by an asymmetrical load. This paper focuses on the switching rule. A complex sliding surface is defined. The inverter is switched in such a way that the system trajectory gets as close to the sliding surface as possible. Experimental results are presented.

   POWER CONTROL OF TWO INDUCTION LOADS SUPPLIED BY A SINGLE GENERATOR: TWO SOLUTIONS
By J-P. Ferrieux; M-C. Pera-Marion; J-P. Rognon; J. Nuns [View]
[Download]

Abstract: This paper presents the power control of two induction loads supplied by a single generator (a thyristor current inverter). Two solutions are presented; both use thyristor switches in each load. In the first case the switches are located in the inductive part of the loads and phase control mode is used; in the second case the switches are located in the active part of the loads and they are controlled in wave train mode.

   HIGH-QUALITY RECTIFIER BASED ON CUK CONVERTER IN DISCONTINUOUS CAPACITOR VOLTAGE MODE
By G. Spiazzi; L. Rossetto; P. Mattavelli; S. Buso [View]
[Download]

Abstract: Cuk converters, operating in Discontinuous Capacitor Voltage Mode (DCVM), can achieve unity power factor when used as rectifiers with no need of duty-cycle modulation. This operating mode causes high voltage stresses across the semiconductors, calling for high-voltage switches like IGBTs. However, zero-voltage turn-off is achieved, resulting in limited power loss even at high frequency. Both current- and voltage-fed approaches as well as constant- and variable-frequency control are analysed in the paper. Simulated and experimental results are reported, which demonstrate actual converter performance.

   AN INPUT CONVERTER OF A DC LOCOMOTIVE WITH COMMUTATORLESS TRACTION MOTORS
By Yu M. Inkov; V. V. Litovchenko; M. D. Simonov [View]
[Download]

Abstract: The paper presents the results of selecting an input converter for the DC locomotive with collectorless traction motors. Alternative pulse disconnecter circuits were compared by evaluating their effects on the load and mains though the load current and ains pulsing factors. The best electromagnetic compatibility characteristics are shown by the converter consisting of two disconnecters connected in series. The found ratios allow the quantitative evaluation of the filter parameters.

EPE 1995 - 34 - Dialogue Session DS3b: Electronic Power Supply Systems (I)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 34 - Dialogue Session DS3b: Electronic Power Supply Systems (I)
	[return to parent folder]

	LOW POWER AND LOW OUTPUT VOLTAGE (3.3V) AC/DC CONVERTER WITH POWER FACTOR CORRECTION By J. A. Cobos; O. Garcia; J. Uceda; J. Sebastian; S. Ollero; E. de la Cruz	[View] [Download]
Abstract: A new structure to obtain low output voltage (3.3 V) from the AC mains is proposed in this paper. The power conversion is carried out in two stages. The first one is in charge of the power factor correction (PFC), whereas the second one provides low output voltage (3.3V) with very high efficiency, by means of self driven synchronous rectification in a half bridge converter with complementary control.

	VARIABLE AND UNBALANCED THREE-PHASES LOAD CONNECTED TO AN DC/AC CONVERTER, CONTROLLED BY ORIENTED FIELD THEORY By J. A. Dominguez Vazquez; I. Valle Gonzalez; S. Lorenzo Matilla; J. M. Ruiz Gonzalez	[View] [Download]
Abstract: Usually loads attached to DC/AC converters are unbalanced and/or variables, preventing the application of Oriented Field Theory (O.F.T.) and loosing its advantages. In this paper, a possible solution is exposed.

	NEW FAST-CHARGE METHODS OF NiCd/NiMH BATTERIES: UNIVERSAL BATTERY CHARGER / DISCHARGER FOR TESTING By M. Gonzalez; J. Lopez; E. Lopez; M. A. Perez	[View] [Download]
Abstract: The design of a universal NiCd/NiMH battery charger/discharger is presented in this paper. The topologies proposed provide all type of charging tests although the main task of the charger is to implement fast-charge techniques. With this system the complete charging/discharging process is monitored and automatically controlled. In this way, research on how battery performance is modified as a function of method is facilitated.

	An Analysis of a Large Air Gap Transformer by Using a Transcutaneous Energy Transmission By Toshi Hiro Nishimura; Tetsuji Eguchi; Takeshi Inoue; Katsuya Hirachi; Yasushi Maejima; Masao Saito	[View] [Download]
Abstract: A flat transformer for a resonant converter that transfers several W of power' across a large variable human skin gap is presented and built. The converter can power a novel cardiac pacemaker battery through intact skin by using a novel transformer with an air gap, which is 10 mm - 15 mm. The integrated equation analysis for a presumption on magnetic flux distribution in the transformer is presented.

	HIGH FREQUENCY SUPPLY SYSTEM WITH POWER FACTOR CORRECTION FOR HALOGEN CYCLE LAMPS By C. Blanco; J. M. Alonso; P. Villegas; E. Lopez; M. Rico	[View] [Download]
Abstract: A low cost and robust high frequency supply system for low power halogen cycle lamps based on a self-oscillating half bridge inverter is described at this paper. With respect to a 50 Hz transformer, weight and size have been minimized. Moreover a high power factor, more than 0.9, has been achieved, and the circuit is reliable and flexible.

	A TRIPORT UPS DESIGN WITH BIPOLAR POWER TRANSISTOR ARRAY BASED AC LINE VOLTAGE REGULATION By Nihal Kulratna; H. W. Sampath	[View] [Download]
Abstract: Use of a triport technique for a UPS of a low VA rating could have its own merits due to easy isolation, simplicity of inverter and other characteristics. In the past, use of a series bipolar power transistor array for AC line voltage regulation has been discussed and the triport configuration of a low VA rating UPS could benefit from this AC regulation technique. Article outlines the design approach and the experimental results achieved in designing such a prototype system of 150 VA rating.

	PARALLEL CONNECTION OF POWER RECTIFIER MODULES WITH VERY HIGH POWER FACTOR FOR RAILWAY APPLICATIONS By A. Lohner; O. Franz; M. Vomfelde	[View] [Download]
Abstract: In this paper a new 35 kW one-phase rectifier module with very high efficiency is presented. By use of a special favourable method of current-regulated modulation it is possible to achieve an input power-factor near to one. Furthermore it is possible to connect several modules in parallel to increase the total power. This concept allows to divide the total installed power into several small modules and distribute them over the given place, if there is not enough place to install one large rectifier. In case of connecting several modules in parallel it is not necessary to connect its control circuits. This feature reduces the connecting expense. The presented rectifier module was designed to be used in modem high-speed trains to supply all inverters, especially the air conditioning inverter, from the 50 Hz or the 16 2/3 Hz 380V one-phase AC network.

	QUASI-SQUARE-WAVE CONVERTER FOR AEROSPACE APPLICATIONS By R. I. Gregory; A. J. Forsyth	[View] [Download]
Abstract: The steady-state conversion characteristics of the Quasi-Square-Wave step-up converter are derived and presented. Variation of the performance characteristics with specification is discussed and the most favourable operating conditions identified. A design of a 150W 80V prototype is presented operating from 24-50V at 700kHz, the full-load efficiency is between 82% and 87%. Practical results from this converter are compared with the theoretical predictions and good agreement is obtained.

	A METHOD OF SYNCHRONIZING MICROPROCESSOR-CONTROLLED PULSE WIDTH MODULATION INVERTERS WITH THE MAINS VOLTAGE By Jovan Z. Bebic; Marko V. Jankovic	[View] [Download]
Abstract: This paper presents a method of synchronizing microprocessor controlled pulse width modulation (PWM) inverters with the line voltage, required for the proper operation of static-switch in UPS systems. Proposed solution is based on a fully digital phase-locked loop (PLL), implemented on a low-performance 8-bit micro controller - 80535. Proposed method has been employed to synchronize 2.5kHz PWM inverter with the line voltage. Results are promissing.

	A NOVEL UNINTERRUPTIBLE POWER SUPPLY SYSTEM WITH SINUSOIDAL INPUT-OUTPUT CHARACTERISTICS AND SIMPLIFIED CONTROL CIRCUIT By G. Ioannidis; E. Xanthoulis; S.N. Manias	[View] [Download]
Abstract: In this paper a novel UPS topology is presented and analysed. The proposed UPS consists of three power stages. The first stage is a SMR which utilises a buck-boost converter for active power correction, the second stage is a high frequency Inverter that provides ohmic isolation and voltage matching and last, the third stage is a low frequency SPWM inverter. Moreover, the proposed UPS exhibits sinusoidal input/output characteristics, high power density and simple control circuit.

	MONOPHASE SUPER RESONANT POWER CONVERTER WITH PULSE AMPLITUDE MODULATION By R. M. Paulussen; M. P. N. van Weesenbeeck; J. B. Klaassens	[View] [Download]
Abstract: A super-resonant monophase DC-AC power converter which features controllable four-quadrant operation capability is presented. The controlled di/dt during turn-on eliminates turn-on losses. Zero-voltage switching is applied to assist turn-off for the forced commutated devices. Output current control and output voltage control is achieved by Pulse Amplitude Modulation (PAM) in combination with Pulse Position Modulation (PPM) of the resonant current pulses. PAM significantly improves the required modulation index for the Pulse Position Modulation. The quasi-constant frequency operation enhances the spectral performance and facilitates the design of input and output filters. A experimental DC-AC converter is built for experimental validation.

	PARALLEL OPERATION OF STANDARD UNINTERRUPTIBLE POWER SUPPLIES BY REACTIVE POWER CONTROL By A. P. Martins; A. S. Carvalho; A. S. Araujo	[View] [Download]
Abstract: The parallel operation of UPS systems can be based on different control methods: active and reactive power control; voltage and frequency droop; instantaneous control of the modulation pulses. This paper presents the results of a control system for parallel operation of UPSs implementing reactive power control. The relative phase between the inverters is constant. Open and closed loop simulated characteristics are presented validating this approach. A digital PI controller is designed based on the continuous equivalent. Simulation results along with experimental ones are presented at the controller level as at the power system. The overall control system is implemented in a simple and low cost platform.

	CONCEPTS FOR AN UNCONVENTIONAL UNINTERRUPTIBLE POWER SUPPLY USING REVERSIBLE CONVERTERS By F. Morin; J-P. Caron; J-P. Hautier	[View] [Download]
Abstract: This paper presents the basic configuration and the control of an unconventionnal off-line standby uninterruptible power supply (UPS); both its converters, connected in series between AC mains supply and battery, are entirely reversible. A switching single-phase bridge ensures the double-fonction: PWM rectifier with an input current spectral optimization and PWM Inverter providing a quasi sinewave voltage to the load. The second converter is in fact a three-pole switch, also called commutation cell, working as a step-down/step-up chopper. It is controlled to adapt the battery voltage level to a capacitor's level; this last component is acting as a buffer between both converters. The authors use a new formalism, Hautier and Guillaud (1), for modeling and research of control algorithms which are illustrated by simulated results.

	PARK VECTOR BASED SLIDING MODE CONTROL OF UPS WITH UNBALANCED LOAD By P. Korondi; H. Hashimoto; F. Harashima; G. Nemeth	[View] [Download]
Abstract: In this paper an inverter is taken to be a member of Variable Structure System (VSS). Park vector based variable structure control (VSC) methods are studied. A modified definition of the Park vector is introduced to handle the effect of zero phase-sequence component caused by an asymmetrical load. This paper focuses on the switching rule. A complex sliding surface is defined. The inverter is switched in such a way that the system trajectory gets as close to the sliding surface as possible. Experimental results are presented.

	POWER CONTROL OF TWO INDUCTION LOADS SUPPLIED BY A SINGLE GENERATOR: TWO SOLUTIONS By J-P. Ferrieux; M-C. Pera-Marion; J-P. Rognon; J. Nuns	[View] [Download]
Abstract: This paper presents the power control of two induction loads supplied by a single generator (a thyristor current inverter). Two solutions are presented; both use thyristor switches in each load. In the first case the switches are located in the inductive part of the loads and phase control mode is used; in the second case the switches are located in the active part of the loads and they are controlled in wave train mode.

	HIGH-QUALITY RECTIFIER BASED ON CUK CONVERTER IN DISCONTINUOUS CAPACITOR VOLTAGE MODE By G. Spiazzi; L. Rossetto; P. Mattavelli; S. Buso	[View] [Download]
Abstract: Cuk converters, operating in Discontinuous Capacitor Voltage Mode (DCVM), can achieve unity power factor when used as rectifiers with no need of duty-cycle modulation. This operating mode causes high voltage stresses across the semiconductors, calling for high-voltage switches like IGBTs. However, zero-voltage turn-off is achieved, resulting in limited power loss even at high frequency. Both current- and voltage-fed approaches as well as constant- and variable-frequency control are analysed in the paper. Simulated and experimental results are reported, which demonstrate actual converter performance.

	AN INPUT CONVERTER OF A DC LOCOMOTIVE WITH COMMUTATORLESS TRACTION MOTORS By Yu M. Inkov; V. V. Litovchenko; M. D. Simonov	[View] [Download]
Abstract: The paper presents the results of selecting an input converter for the DC locomotive with collectorless traction motors. Alternative pulse disconnecter circuits were compared by evaluating their effects on the load and mains though the load current and ains pulsing factors. The best electromagnetic compatibility characteristics are shown by the converter consisting of two disconnecters connected in series. The found ratios allow the quantitative evaluation of the filter parameters.