Industry Patents
Patent: 5424618
Arrangements for Reducing Interference from a Dimming System, and Dimmer Therefor
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| Patent Number: |
5424618 |
| Title: |
Arrangements for Reducing Interference from a Dimming System, and Dimmer Therefor |
| Abstract: |
A lighting control system which comprises an AC mains power point, power
distribution means coupled to the AC mains, a dimmer assembly comprising
one or a plurality of co-located dimmer circuits each coupled to the
distribution means to receive AC power therefrom, and each comprising an
output port developing an AC power signal of frequency corresponding to
the AC mains, each said dimmer circuit comprising a current path between
the distribution means and the output port, a switching means located in
the current path so as to controllably interrupt passage of current,
switch driving means supplying a control signal to the switching means to
cause it to interrupt the current path a multiplicity of times within each
AC half cycle, and filtering means in the current path between the
switching means and the output port arranged to smooth the current
therethrough, the filtering means being arranged to attenuate current
components at the frequency of operation of the switching means, and not
substantially to attenuate current components at the frequency of the
mains, the switch driving means being controllable to vary the duty factor
of operation of the switching means, so as to provide at the output port a
power signal at the mains frequency with an RMS amplitude related to the
duty factor of the switching means; dimmer control means connected via a
connection means to the switch driving means of each dimmer circuit to
vary the duty factor thereof in accordance with a desired power output
thereof; a power cable connected to each output port to enable one or many
luminaire units to be supplied with power from a respective dimmer unit.
|
| Country of Issue: |
US |
| First Named Inventor: |
Bertenshaw, Brown |
| Assignee: |
Strand Lighting |
| Continuation or Divisional of: |
|
| International Classification: |
H05B 37/00 |
| US Classification: |
315/324 |
| Issue Date: |
06-13-1995 |
| Filing Date: |
05-28-1993 |
| Application : |
70110 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
5424618 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
5424618 at Google Patents |
1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.
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