Industry Patents
Patent: 4688161
Regulated Power Supply Apparatus and Method Using Reverse Phase Angle Control
(Click image for PDF of full patent)
| Patent Number: |
4688161 |
| Title: |
Regulated Power Supply Apparatus and Method Using Reverse Phase Angle Control |
| Abstract: |
A power converter for converting 60 Hertz line power to 20 kilohertz power
for driving a low voltage incandescent lamp (42). A field effect
transistor power switch section (12) is connected through bridge
rectifiers (10, 32) for charging a capacitor filter (34) with the AC input
power. A 20 kHz oscillator (38) drives a half-bridge inverter (36) for
coupling the capactitor voltage to the lamp (42) as high frequency power.
The conduction of the FET power switch (12) is controlled by a phase
locked loop (16) for synchronizing the conduction with the zero crossing
points of the AC cycle. A ramp generator (18) and a summing network (20)
are responsive to a lamp intensity control (22) for changing the
conduction duty cycle of the FET power switch (12) such that a desired
lamp intensity is maintained.
|
| Country of Issue: |
US |
| First Named Inventor: |
Covington |
| Assignee: |
Vari-Lite |
| Continuation or Divisional of: |
|
| International Classification: |
H02M 5/458 |
| US Classification: |
363/37 |
| Issue Date: |
08-18-1987 |
| Filing Date: |
07-16-1986 |
| Application : |
887367 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
4688161 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
4688161 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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