Industry Patents
Patent: 4633161
Improved Inductorless Phase Control Dimmer Power Stage with Semiconductor Controlled Voltage Rise Time
(Click image for PDF of full patent)
| Patent Number: |
4633161 |
| Title: |
Improved Inductorless Phase Control Dimmer Power Stage with Semiconductor Controlled Voltage Rise Time |
| Abstract: |
An electronic dimming apparatus includes a semiconductor power controller
which couples a lamp to an alternating current source and variably
controls the average power supplied to the lamp by adjusting the relative
proportion of each half-cycle in which the power controller is in a
conductive condition. The semiconductor power controller is controlled by
the output of a transition controller which in turn is connected to a
triggering circuit. The triggering circuit is responsive to a first input
condition corresponding to desired average power and also responsive to
the zero-crossing of the alternating current waveform. The transition
controller gradually changes the condition state of the semiconductor
power controller between non-conduction and conduction and controls the
voltage across the lamp load to maintain a stable rate of voltage change
despite lamp impedance variations, thus reducing electromagnetic
interference.
|
| Country of Issue: |
US |
| First Named Inventor: |
Callahan, Chester, Goddard |
| Assignee: |
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| Continuation or Divisional of: |
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| International Classification: |
H05B 37/02 |
| US Classification: |
323/242 |
| Issue Date: |
12-30-1986 |
| Filing Date: |
08-15-1984 |
| Application : |
640978 |
| Notes: |
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| Link to Patent at freepatentsonline.com: |
4633161 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
4633161 at Google Patents |
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after the patent has issued - they take a while to get new patents in their systems.
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