EPE Association: EPE 1997 - 03: Lecture Session L1c: ELECTRONIC POWER SUPPLIES SYSTEMS

EPE 1997 - 03: Lecture Session L1c: ELECTRONIC POWER SUPPLIES SYSTEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 - 03: Lecture Session L1c: ELECTRONIC POWER SUPPLIES SYSTEMS

   [return to parent folder]

   Ni-Cd AND Ni-MH BATTERY FAST-CHARGER FOR PORTABLE APPLICATIONS BASED UPON AN INTELLIGENT IC
By M. Gonzalez; M. A. Perez; J. Diaz; F.F. Linera; P. Martinez [View]
[Download]

Abstract: This paper presents the implementation of an optimized fast-charge method for Ni-Cd and NiMH batteries used in portable applications. The proposed method performs the following two basic functions. The first one determines battery state (detecting deteriorated batteries, analyzing the state of charge and so on). The second one optimizes the charging time and, simultaneously, guarantees a safe fast-charge without negative effects on battery life. In order to facilitate the implementation of charge system, a new battery management re have been developed. This IC monitors battery's main parameters and controls the complete charge process by driving charging/discharging power stage switches. As the re requires few peripheral components, an efficient and economic battery fast-charger is obtained.

   LARGE-SIGNAL MODELING, SUBHARMONICS AND BIFURCATION BEHAVIOUR OF PWM SWITCHING CONVERTERS
By K. K. Tse; Henry Chung; S. Y. R. Hui [View]
[Download]

Abstract: A discrete-time large-signal dynamic model of closed-loop PWM switching regulators is derived. No small-ripple approximation is assumed. The model can be used to study regulator operation stability, bifurcation, and subharmonic phenomenon. It is demonstrated in an example of a buck regulator operating in continuous conduction mode with output voltage feedback. The bifurcation behaviour of the regulator with proportional and proportional-plus-integral feedback is investigated. An iterative mapping technique is used to analyse the unstable behaviour of the regulator when it is subject to large parameter changes. The theoretical predictions are favourably verified with measurements. The proposal can be used as a tool for control design of power converters.

EPE 1997 - 03: Lecture Session L1c: ELECTRONIC POWER SUPPLIES SYSTEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 - 03: Lecture Session L1c: ELECTRONIC POWER SUPPLIES SYSTEMS
	[return to parent folder]

	Ni-Cd AND Ni-MH BATTERY FAST-CHARGER FOR PORTABLE APPLICATIONS BASED UPON AN INTELLIGENT IC By M. Gonzalez; M. A. Perez; J. Diaz; F.F. Linera; P. Martinez	[View] [Download]
Abstract: This paper presents the implementation of an optimized fast-charge method for Ni-Cd and NiMH batteries used in portable applications. The proposed method performs the following two basic functions. The first one determines battery state (detecting deteriorated batteries, analyzing the state of charge and so on). The second one optimizes the charging time and, simultaneously, guarantees a safe fast-charge without negative effects on battery life. In order to facilitate the implementation of charge system, a new battery management re have been developed. This IC monitors battery's main parameters and controls the complete charge process by driving charging/discharging power stage switches. As the re requires few peripheral components, an efficient and economic battery fast-charger is obtained.

	LARGE-SIGNAL MODELING, SUBHARMONICS AND BIFURCATION BEHAVIOUR OF PWM SWITCHING CONVERTERS By K. K. Tse; Henry Chung; S. Y. R. Hui	[View] [Download]
Abstract: A discrete-time large-signal dynamic model of closed-loop PWM switching regulators is derived. No small-ripple approximation is assumed. The model can be used to study regulator operation stability, bifurcation, and subharmonic phenomenon. It is demonstrated in an example of a buck regulator operating in continuous conduction mode with output voltage feedback. The bifurcation behaviour of the regulator with proportional and proportional-plus-integral feedback is investigated. An iterative mapping technique is used to analyse the unstable behaviour of the regulator when it is subject to large parameter changes. The theoretical predictions are favourably verified with measurements. The proposal can be used as a tool for control design of power converters.