EPE Association: EPE 1997 – 29: Dialogue Session DS3b: POWER SUPPLIES, BATTERY CHARGERS

EPE 1997 – 29: Dialogue Session DS3b: POWER SUPPLIES, BATTERY CHARGERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 29: Dialogue Session DS3b: POWER SUPPLIES, BATTERY CHARGERS

   [return to parent folder]

   MODELING A NICKEL CADMIUM BATTERY AND SIMULATION OF A BATTERY CHARGE LIMITER FOR AIRCRAFT
By L. Bonenfant; M. Pietrzak-David; B. de Fornel; A.Geoffroy [View]
[Download]

Abstract: This paper presents a Nickel-Cadmium battery model and a simulation of a battery charge limiter (BCL). This kind of BCL is linked to a transformer rectifier. Simulations enable us to predict with more accuracy the battery life and problems which could occur with the controller used. This couple BCL/battery is already mounted on AIRBUS A330/A340 airplanes. This form the on-board power supply in case of failures. The battery model had been written in MAST, an Analog Hardware Description Language (Mantooth and Fregenbaum [1]). Simulations have been performed on SABER simulator from Analogy Inc.

   HIGH FREQUENCY DC/DC CONVERSION USING A NOVEL CONCEPT OF MULTIPLE FREQUENCY OPERATION WITH PULSEWIDTH MODULATED OUTPUT
By Pradeep Chhawchharia; D.K.W. Cheng; Y.S. Lee [View]
[Download]

Abstract: A novel concept in high frequency DC/DC conversion is proposed. A switch feeds the energy from a DC voltage source to an inductor, which is an integral part of the resonator-rectifier combination. The resonance in the resonator-rectifier combination takes place at a higher freqency as compared to the switch operating frequency and energy is transferred to the output load until the oscillations in the resonator-rectifier combination die out. This allows a high frequency operation of the circuit whereas low frequency operation of the switch. The output voltage regulation is achieved by controlling the amount of energy input into the inductor either by pulse width modulation and/or the off time variation. A good efficiency is achieved in megahertz range. The simulation results support the validity of the concept.

   A Practical Implementation of a Charger of a Battery of Capacitors (O.5F) for X-Ray Applications
By O. Garcia; P. Alou; J.A. Cobos; R. Prieto; J. Uceda; J. Casero [View]
[Download]

Abstract: This paper describes the design issues of a very special power supply. The target is to charge a big set of capacitors (0.5F) at a relatively high voltage (340V) .fi·om· a 24V (20-32V) battery in a limited period of time. Such amount of energy (29kJ) is used in a X-ray portable equipment for medical applications. For this capacitor charging power supply (CCPS), several topological configurations, control methods and devices are discussed from the point of view of size, cost and reliability. The variations of the output power, switching frequency and duty cycle, produced by the evolution of the output voltage are the main constraints of this design. Experimental results are included in the paper.

   PERFORMANCE OF FERRORESONANT TRANSFORMER IN MICROPROCESSOR BASED BATTERY CHARGER FOR ELECTRIC VEHICLES
By C.R. Mersman; M.M. Morcos; N.G. Dillman [View]
[Download]

Abstract: Electric vehicles (EVs) are needed in densely populated metropolitan areas to reduce air pollution. Efficient, low-distortion, safe battery chargers are needed to supply dc voltage to charge the high energy battery packs used in EV's. The power delivery section of the charger is a ferroresonant transformer. Because of its inherent characteristics, the ferroresonant transformer is well suited for battery charging applications. The control section of the battery charger periodically places a resistive load across the battery under charge that allows this change in resistance to be detected. A microprocessor controls the timing and executes the gating of the needed switches in the circuit, and then gathers and analyzes data from battery charge monitor circuit. The charger monitor circuit measures the voltage drop across the battery, which is proportional to the battery internal resistance, when the load is introduced. Test results indicate that a ferroresonant transformer makes an excellent base for the power delivery section of a high voltage battery charger.

EPE 1997 – 29: Dialogue Session DS3b: POWER SUPPLIES, BATTERY CHARGERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 29: Dialogue Session DS3b: POWER SUPPLIES, BATTERY CHARGERS
	[return to parent folder]

	MODELING A NICKEL CADMIUM BATTERY AND SIMULATION OF A BATTERY CHARGE LIMITER FOR AIRCRAFT By L. Bonenfant; M. Pietrzak-David; B. de Fornel; A.Geoffroy	[View] [Download]
Abstract: This paper presents a Nickel-Cadmium battery model and a simulation of a battery charge limiter (BCL). This kind of BCL is linked to a transformer rectifier. Simulations enable us to predict with more accuracy the battery life and problems which could occur with the controller used. This couple BCL/battery is already mounted on AIRBUS A330/A340 airplanes. This form the on-board power supply in case of failures. The battery model had been written in MAST, an Analog Hardware Description Language (Mantooth and Fregenbaum [1]). Simulations have been performed on SABER simulator from Analogy Inc.

	HIGH FREQUENCY DC/DC CONVERSION USING A NOVEL CONCEPT OF MULTIPLE FREQUENCY OPERATION WITH PULSEWIDTH MODULATED OUTPUT By Pradeep Chhawchharia; D.K.W. Cheng; Y.S. Lee	[View] [Download]
Abstract: A novel concept in high frequency DC/DC conversion is proposed. A switch feeds the energy from a DC voltage source to an inductor, which is an integral part of the resonator-rectifier combination. The resonance in the resonator-rectifier combination takes place at a higher freqency as compared to the switch operating frequency and energy is transferred to the output load until the oscillations in the resonator-rectifier combination die out. This allows a high frequency operation of the circuit whereas low frequency operation of the switch. The output voltage regulation is achieved by controlling the amount of energy input into the inductor either by pulse width modulation and/or the off time variation. A good efficiency is achieved in megahertz range. The simulation results support the validity of the concept.

	A Practical Implementation of a Charger of a Battery of Capacitors (O.5F) for X-Ray Applications By O. Garcia; P. Alou; J.A. Cobos; R. Prieto; J. Uceda; J. Casero	[View] [Download]
Abstract: This paper describes the design issues of a very special power supply. The target is to charge a big set of capacitors (0.5F) at a relatively high voltage (340V) .fi·om· a 24V (20-32V) battery in a limited period of time. Such amount of energy (29kJ) is used in a X-ray portable equipment for medical applications. For this capacitor charging power supply (CCPS), several topological configurations, control methods and devices are discussed from the point of view of size, cost and reliability. The variations of the output power, switching frequency and duty cycle, produced by the evolution of the output voltage are the main constraints of this design. Experimental results are included in the paper.

	PERFORMANCE OF FERRORESONANT TRANSFORMER IN MICROPROCESSOR BASED BATTERY CHARGER FOR ELECTRIC VEHICLES By C.R. Mersman; M.M. Morcos; N.G. Dillman	[View] [Download]
Abstract: Electric vehicles (EVs) are needed in densely populated metropolitan areas to reduce air pollution. Efficient, low-distortion, safe battery chargers are needed to supply dc voltage to charge the high energy battery packs used in EV's. The power delivery section of the charger is a ferroresonant transformer. Because of its inherent characteristics, the ferroresonant transformer is well suited for battery charging applications. The control section of the battery charger periodically places a resistive load across the battery under charge that allows this change in resistance to be detected. A microprocessor controls the timing and executes the gating of the needed switches in the circuit, and then gathers and analyzes data from battery charge monitor circuit. The charger monitor circuit measures the voltage drop across the battery, which is proportional to the battery internal resistance, when the load is introduced. Test results indicate that a ferroresonant transformer makes an excellent base for the power delivery section of a high voltage battery charger.