Industry Patents
Patent: 5004969
Phase Control Switching Circuit Without Zero Crossing Detection
(Click image for PDF of full patent)
| Patent Number: |
5004969 |
| Title: |
Phase Control Switching Circuit Without Zero Crossing Detection |
| Abstract: |
A method and circuit for reverse phase control of alternating current being
delivered to a load are disclosed wherein voltage-controlled semiconductor
switches, such as MOSFET's and IGBT's, are used as electronic switches to
conduct voltage during the leading edge of the AC voltage cycle and
conduction is terminated when the desired phase angle of the current flow
has been reached. The disclosed method and circuit eliminate the need for
zero crossing detection of the AC waveform and ensure that the
voltage-controlled switches are always turned on before the zero crossing
thereby minimizing radiated interference and incandescent lamp hum. The
method used is primarily digital in nature making mechanical input or
electronic input for the power control equally efficient to implement.
|
| Country of Issue: |
US |
| First Named Inventor: |
Schanin |
| Assignee: |
Bayview Technology Group |
| Continuation or Divisional of: |
|
| International Classification: |
G05F 1/445 |
| US Classification: |
323/235 |
| Issue Date: |
04-02-1991 |
| Filing Date: |
10-16-1989 |
| Application : |
422396 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
5004969 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
5004969 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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