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A Parallel-Connected Active Filter for the Reduction of Supply Current Distortion

A Parallel-Connected Active Filter for the Reduction of Supply Current Distortion
A Parallel-Connected Active Filter for the Reduction of Supply Current Distortion
The use of switching regulators and power supplies in domestic and light industrial environments is becoming more common. Their popularilty derives from a number of desirable characteristics, but a highly undesirable feature, often overlooked by the designer, is the highly nonlinear load imposed by these systems on the supply. For a single load, it is not uncommon to find more than 90% of the power extracted during the central 30 degrees of the supply halfwave. When large numbers of these systems are connected to a common supply (for example, a bank may have literally hundreds of PCs in a dealing room in a single building), significant harmonic distortion can be induced in the supply and thus experienced by other loads. In this paper, we discuss a practical implementation of a waveform correcting circuit; the system stores energy in a capacitor and injects it appropriately into the local supply distribution subsystem, such that the overall load experienced by the external supply is sinusoidal. The system is physically small, and dissipates little power in its own right. It is thus suitable for installation in, for example, an office environment.
Pedder, Don A.G.
86a21bc7-9e82-4fb8-ba18-e0c2d500faed
Brown, Andrew D.
5c19e523-65ec-499b-9e7c-91522017d7e0
Ross, J. Neil
7099831f-3f8e-41b1-8d02-f6bd1cdf4f2f
Williams, Alan C.
4c566cf2-8942-410b-9741-eb4a90f7125f
Pedder, Don A.G.
86a21bc7-9e82-4fb8-ba18-e0c2d500faed
Brown, Andrew D.
5c19e523-65ec-499b-9e7c-91522017d7e0
Ross, J. Neil
7099831f-3f8e-41b1-8d02-f6bd1cdf4f2f
Williams, Alan C.
4c566cf2-8942-410b-9741-eb4a90f7125f

Pedder, Don A.G., Brown, Andrew D., Ross, J. Neil and Williams, Alan C. (2000) A Parallel-Connected Active Filter for the Reduction of Supply Current Distortion.

Record type: Other

Abstract

The use of switching regulators and power supplies in domestic and light industrial environments is becoming more common. Their popularilty derives from a number of desirable characteristics, but a highly undesirable feature, often overlooked by the designer, is the highly nonlinear load imposed by these systems on the supply. For a single load, it is not uncommon to find more than 90% of the power extracted during the central 30 degrees of the supply halfwave. When large numbers of these systems are connected to a common supply (for example, a bank may have literally hundreds of PCs in a dealing room in a single building), significant harmonic distortion can be induced in the supply and thus experienced by other loads. In this paper, we discuss a practical implementation of a waveform correcting circuit; the system stores energy in a capacitor and injects it appropriately into the local supply distribution subsystem, such that the overall load experienced by the external supply is sinusoidal. The system is physically small, and dissipates little power in its own right. It is thus suitable for installation in, for example, an office environment.

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More information

Published date: October 2000
Organisations: EEE

Identifiers

Local EPrints ID: 254174
URI: http://eprints.soton.ac.uk/id/eprint/254174
PURE UUID: 1b9a29eb-df72-4849-9018-d0a26b1864a9

Catalogue record

Date deposited: 04 Jun 2001
Last modified: 27 Apr 2022 06:12

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Contributors

Author: Don A.G. Pedder
Author: Andrew D. Brown
Author: J. Neil Ross
Author: Alan C. Williams

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