Lighting control system with corrugated heat sink

• US 5,808,417 A
• Filed: 05/17/1996
• Issued: 09/15/1998
• Est. Priority Date: 04/11/1994
• Status: Expired due to Term

• Current Assignee: Lutron Technology Company LLC
• Original Assignee: Lutron Electronics Company Incorporated (Lutron Electronics)
• Inventors: Zaharchuk, Walter S., Ference, Jonathan H., Hausman, Donald F., Loar, John F., Spehalski, Robert S.
• Primary Examiner(s): Pascal, Robert J.
• Assistant Examiner(s): VU, DAVID HUNG
• Application Number:
  US08/650,076
• Time in Patent Office: 851 Days
• Field of Search: 361/674, 174/DIG. 2, 315/291, 315/195, 315/DIG. 4, 315/112, 315/117, 315/118, 336/59, 336/65, 336/66, 336/90, 336/96
• US Class Current: 315/112
• CPC Class Codes: H05B 39/08 by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices in converters H02M5/00; with regulation G05F1/44
• CPC Class Codes: H05B 39/086 with possibility of remote control
• CPC Class Codes: H05B 47/155 Coordinated control of two or more light sources
• CPC Class Codes: H05B 47/165 following a pre-assigned programmed sequence; Logic control [LC]
• CPC Class Codes: H05B 47/18 via data-bus transmission
• CPC Class Codes: Y10S 315/04 Dimming circuit for fluorescent lamps

Abstract

A dimmer panel for controlling the intensity of a plurality of electric light sources includes a plurality of dimming circuits. Each dimming circuit has a control circuit, a heat producing controllably conductive power switch such as a triac, and a heat producing coil such as a choke. The power switches and coils are arranged on a corrugated heat sink to minimize component temperatures in the dimming control circuit and of the power switches. The heat producing coils are remotely located from the control circuit and the power switches, so that the heat generated by the coils does not increase the temperature of the components in the control circuit or of the power switches.

Claims

1. A dimming panel for controlling the intensity of a plurality of electrical light sources, said dimming panel comprising a thermally conductive support plate having a plurality of heat-generating dimming circuits disposed thereon, said support plate being a continuous serpentine sheet of material having a selected substantially uniform thickness and being shaped to form a plurality of first flats and second flats, said first flats and said second flats being substantially parallel to one another and being joined by portions of said continuous sheet which define wall portions disposed at an angle to said first and second flats, said first and second flats and said wall portions defining open channels between opposing wall portions.

2. The apparatus as defined by claim 1 wherein each of said dimming circuits comprises a controllably conductive device and a heat-producing coil, said dimming circuits disposed so that their respective heat-producing coils are disposed on said support plate at a location remote from their respective controllably conductive devices.

3. The apparatus as defined by claim 2 wherein said dimming circuits are disposed on said support plate in a pattern such that more of said controllably conductive devices are disposed at the support plate'"'"'s periphery than at the central region thereof.

4. The apparatus as described by claim 2 wherein said dimming circuits are disposed on said support plate so that all of their respective controllably conductive devices are thermally coupled to only said first flats or second flats of said support plate and said coils are thermally coupled to both the first and second flats of said support plate.

5. The apparatus as defined by claim 1 wherein said support plate is made of aluminium and has a thickness of about 3 mm.

6. The apparatus as defined by claim 1, wherein said first flats are coplanar and define a common first plane and said second flats are coplanar and define a common second plane, said first and second planes being parallel and spaced apart by a preselected distance, said wall portions connecting said first and second coplanar flats and defining a first plurality of channels having open ends coplanar with said first planes and a second plurality of channels having open ends coplanar with said second planes.

7. The apparatus as defined by claim 6 wherein the depths of said channels is about 25 mm.