EPE Association: EPE 1999 - Topic 03b: DC Power Supplies

EPE 1999 - Topic 03b: DC Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1999 - Conference > EPE 1999 - Topic 03: POWER SUPPLIES > EPE 1999 - Topic 03b: DC Power Supplies

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   Control of a Cascaded System with Near Unity Power Factor and Imp...
By S. Pierfederici; B. Davat [View]
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Abstract: In this paper, a method, which allows controlling cascaded power converters is presented. The method uses a first order development of the power system equation around the functioning point. It is shown that an uncoupling structure for an optimal control of the converters is always possible to be exhibited. Two kinds of power systems are considered. The first one is a Boot-Forward cascade for which the proposed method leads to a perfect robust control of internal variables. The second ones is constituted of a Boost converter supplying a brushless DC motor with its inverter. the proposed method modifies control structure of both the Boost voltage loop and the space vector control of the motor. A perfect control of the DC link is obtained especially during speed variations.

   DC-DC-Converter with Very High Insulation Capability
By N. Volkert [View]
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Abstract: A dc-dc-converter is presented which has been designed to supply sensor and driving circuits used in medium-voltage inverters. The dc-dc-converter is based on a piezoelectric transformer with a very high insulation capability. A complete digital automatic control ensures a stable operation without the need of any manual frequency trimming. The output of the presented power supply is no-load- and short-circuit-proof. The coupling capacitance between the primary side and the secondary side is extremely small. With a prototype a continuous power of more than 10W has been transmitted.

   Trends in Low Power Low Voltage DC/DC Converters
By P. Alou; J.A. Cobos; J. Uceda; M. Rascón; E. de la Cruz [View]
[Download]

Abstract: Microelectronics technology is constantly changing, increasing integration density and operation speed. Very high quality voltage (1.5V) is needed to supply these new integrated circuits. Topologies used in the last years to supply low voltage circuits (FAC, HBCC), are not the best option now, because their dynamic response is not the best to supply properly the new loads. Topologies that drive symmetrically the transformer (HB, Push pull) are a better option, but new techniques to implement SDSR are necessary. Two possible solutions for powering the new IC are presented and tested in this paper.

   Use of Coreless Printed Circuit Board (PCB) Transformers for Ener...
By S.C. Tang; S.Y.R. Hui; H.S.H. Chung [View]
[Download]

Abstract: Magnetic cores have been used in transformers for over a century. In this paper, the use of coreless PCB transformers for energy conversion is described. Coreless PCB transformers eliminate the magnetic cores and their limitations. The drastic reduction in the vertical dimension in coreless PCB transformers enables these transformers to have very high power density and offers a new technology for developing very low-profile power converters.

EPE 1999 - Topic 03b: DC Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1999 - Conference > EPE 1999 - Topic 03: POWER SUPPLIES > EPE 1999 - Topic 03b: DC Power Supplies
	[return to parent folder]

	Control of a Cascaded System with Near Unity Power Factor and Imp... By S. Pierfederici; B. Davat	[View] [Download]
Abstract: In this paper, a method, which allows controlling cascaded power converters is presented. The method uses a first order development of the power system equation around the functioning point. It is shown that an uncoupling structure for an optimal control of the converters is always possible to be exhibited. Two kinds of power systems are considered. The first one is a Boot-Forward cascade for which the proposed method leads to a perfect robust control of internal variables. The second ones is constituted of a Boost converter supplying a brushless DC motor with its inverter. the proposed method modifies control structure of both the Boost voltage loop and the space vector control of the motor. A perfect control of the DC link is obtained especially during speed variations.

	DC-DC-Converter with Very High Insulation Capability By N. Volkert	[View] [Download]
Abstract: A dc-dc-converter is presented which has been designed to supply sensor and driving circuits used in medium-voltage inverters. The dc-dc-converter is based on a piezoelectric transformer with a very high insulation capability. A complete digital automatic control ensures a stable operation without the need of any manual frequency trimming. The output of the presented power supply is no-load- and short-circuit-proof. The coupling capacitance between the primary side and the secondary side is extremely small. With a prototype a continuous power of more than 10W has been transmitted.

	Trends in Low Power Low Voltage DC/DC Converters By P. Alou; J.A. Cobos; J. Uceda; M. Rascón; E. de la Cruz	[View] [Download]
Abstract: Microelectronics technology is constantly changing, increasing integration density and operation speed. Very high quality voltage (1.5V) is needed to supply these new integrated circuits. Topologies used in the last years to supply low voltage circuits (FAC, HBCC), are not the best option now, because their dynamic response is not the best to supply properly the new loads. Topologies that drive symmetrically the transformer (HB, Push pull) are a better option, but new techniques to implement SDSR are necessary. Two possible solutions for powering the new IC are presented and tested in this paper.

	Use of Coreless Printed Circuit Board (PCB) Transformers for Ener... By S.C. Tang; S.Y.R. Hui; H.S.H. Chung	[View] [Download]
Abstract: Magnetic cores have been used in transformers for over a century. In this paper, the use of coreless PCB transformers for energy conversion is described. Coreless PCB transformers eliminate the magnetic cores and their limitations. The drastic reduction in the vertical dimension in coreless PCB transformers enables these transformers to have very high power density and offers a new technology for developing very low-profile power converters.