Programmable alternating current switch
US4119905A · kind A · utility
11Cited by
2References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1977 |
| Grant date | Oct 10, 1978 |
| Priority date | — |
| Expiry date | Sep 30, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/66
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A programmable alternating current switch for connecting an A.C. supply to a load for a controlled fraction of each cycle to thereby control the average power to loads, such as lamps, heaters, motors, etc. A Programmable Unijunction Transistor (PUT) is employed to control the phase angle of the A.C. wave at which a Triac is fired, the Triac continuing to conduct and deliver load current for the remainder of that half-cycle. Coupled between the PUT and the Triac is a Light Activated Silicon Controlled Rectifier (LASCR) and a diode bridge which provides full-wave operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.