EPE Association: EPE-PEMC 2000 - Topic 05a: Power Supplies and UPS Systems

EPE-PEMC 2000 - Topic 05a: Power Supplies and UPS Systems
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 05: Applications of Power Electronic Systems > EPE-PEMC 2000 - Topic 05a: Power Supplies and UPS Systems

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   A High-Efficiency Dimmable Electronic Ballast for Fluorescent Lamps
By Cheng H.L., Moo C.S., Chuang Y.C.* [View]
[Download]

Abstract: A high-efficiency electronic ballast is designed to drive the fluorescent lamp with dimming operation by frequency control. An auxiliary resonant circuit is added to the load resonant inverter to reduce both conduction losses and switching losses of the active power switches, leading to a relatively high efficiency over the dimmable range. The design equations are derived by fundamental approximation based on a power-dependent resistance model of the lamp. A design example with experimental results is provided for illustrating the circuit performance.

   A New Control Strategy with Voltage Differential Feedback for Single-Phase Voltage Source UPS Inverters
By Gao J., Zhao X., Xu Y., Wang Z. [View]
[Download]

Abstract: In this paper a new control strategy with capacitor voltage differential feedback for the single-phase voltage source UPS inverter is introduced and analyzed. In this control scheme, only the capacitor voltage needed to be sensed as a control variable. Except for the basic features of most feedback control strategy, the scheme offers many features that are attractive to the UPS applications such as lower content of harmonics and fast dynamic response. A 5kVA UPS system under the proposed control scheme is provided to verify all of these features

   A Single-Stage High-Power-Factor Electronic Ballast for Fluorescent Lamps with Constant Power Operation
By Moo C.S., Lin T.F., Yao C.Hsieh [View]
[Download]

Abstract: A single-stage high-power-factor electronic ballast is designed to operate fluorescent lamps at a constant power in a very wide input voltage range. The electronic ballast performs the constant power operation by adjusting the duty-ratio of the embedded power regulation circuit. With duty-ratio control, a preheating period for the cathode filaments can be provided before igniting the lamp. The operation of the electronic ballast is discussed by an illustrative example with experimental results.

   Minimization of Structure Demands in P.F.C. Battery Chargers Using an Optimal Control Method
By Papanikolaou N.P., Tatakis E.C. [View]
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Abstract: This paper presents an optimal control method in order to achieve high power factor correction and simultaneously minimizing the necessary active and passive components (LC filters, semiconductor switches etc) in battery charging structures. The aim of this method is to achieve high power factor correction without using an excessive P.F.C. prestage. Furthermore, the control loop of this method demands less components than any case of the classical P.F.C. techniques, since it manages to overcome the input current sense. Thus, the control circuit becomes simplier and by utilizing a single converter only can be performed both high P.F.C. and battery charging with a specific strategy (e.g. constant current, constant voltage e.t.c.). An extended theoretical analysis of this method will be presented and a comparison between the P.F.C. preregulation, the current mode control technique and the proposed technique - all applied on a flyback charger - will be accomplished (based on PSPICE simulation results), in order to highlight the advantages of the proposed method.

EPE-PEMC 2000 - Topic 05a: Power Supplies and UPS Systems
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 05: Applications of Power Electronic Systems > EPE-PEMC 2000 - Topic 05a: Power Supplies and UPS Systems
	[return to parent folder]

	A High-Efficiency Dimmable Electronic Ballast for Fluorescent Lamps By Cheng H.L., Moo C.S., Chuang Y.C.*	[View] [Download]
Abstract: A high-efficiency electronic ballast is designed to drive the fluorescent lamp with dimming operation by frequency control. An auxiliary resonant circuit is added to the load resonant inverter to reduce both conduction losses and switching losses of the active power switches, leading to a relatively high efficiency over the dimmable range. The design equations are derived by fundamental approximation based on a power-dependent resistance model of the lamp. A design example with experimental results is provided for illustrating the circuit performance.

	A New Control Strategy with Voltage Differential Feedback for Single-Phase Voltage Source UPS Inverters By Gao J., Zhao X., Xu Y., Wang Z.	[View] [Download]
Abstract: In this paper a new control strategy with capacitor voltage differential feedback for the single-phase voltage source UPS inverter is introduced and analyzed. In this control scheme, only the capacitor voltage needed to be sensed as a control variable. Except for the basic features of most feedback control strategy, the scheme offers many features that are attractive to the UPS applications such as lower content of harmonics and fast dynamic response. A 5kVA UPS system under the proposed control scheme is provided to verify all of these features

	A Single-Stage High-Power-Factor Electronic Ballast for Fluorescent Lamps with Constant Power Operation By Moo C.S., Lin T.F., Yao C.Hsieh	[View] [Download]
Abstract: A single-stage high-power-factor electronic ballast is designed to operate fluorescent lamps at a constant power in a very wide input voltage range. The electronic ballast performs the constant power operation by adjusting the duty-ratio of the embedded power regulation circuit. With duty-ratio control, a preheating period for the cathode filaments can be provided before igniting the lamp. The operation of the electronic ballast is discussed by an illustrative example with experimental results.

	Minimization of Structure Demands in P.F.C. Battery Chargers Using an Optimal Control Method By Papanikolaou N.P., Tatakis E.C.	[View] [Download]
Abstract: This paper presents an optimal control method in order to achieve high power factor correction and simultaneously minimizing the necessary active and passive components (LC filters, semiconductor switches etc) in battery charging structures. The aim of this method is to achieve high power factor correction without using an excessive P.F.C. prestage. Furthermore, the control loop of this method demands less components than any case of the classical P.F.C. techniques, since it manages to overcome the input current sense. Thus, the control circuit becomes simplier and by utilizing a single converter only can be performed both high P.F.C. and battery charging with a specific strategy (e.g. constant current, constant voltage e.t.c.). An extended theoretical analysis of this method will be presented and a comparison between the P.F.C. preregulation, the current mode control technique and the proposed technique - all applied on a flyback charger - will be accomplished (based on PSPICE simulation results), in order to highlight the advantages of the proposed method.