Lamp control and lamp switch circuit for controlling light balance
US3950640A · kind A · utility
3Cited by
3References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1975 |
| Grant date | Apr 13, 1976 |
| Priority date | — |
| Expiry date | Apr 17, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/3922
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Control and switching circuits for maintaining appropriate balance of light output of a long multi-vapor arc lamp. The control circuit includes sensing, amplifier-reference, phase amplitude detector, time base generator and lamp switching logic branches. The switching circuit includes a silicon controlled rectifier bridge for reversing the polarity of current flow through the lamp. The silicon controlled rectifier bridge is triggered by output pulse chains from the lamp switching logic branch in the control circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.