High frequency power source for fluorescent lamps and the like
US4005335A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1975 |
| Grant date | Jan 25, 1977 |
| Priority date | — |
| Expiry date | Jul 15, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/2855
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power source for operating gas discharge lamps and other loads at high frequency, typically utilizing a 115 volt ac source rectified to provide a 150 volt dc input and providing a 20,000 hertz output. An inverter with a transistor current control for protection against transistor damage under open circuit, starting and no-load conditions, with low power consumption under no-load and with dimming capability. An inverter with a detector circuit connected across the feedback winding or an additional control winding for developing a control signal varying as a function of the feedback winding output, and a zener diode or other device for connecting the control signal to the base of the transistor in current controlling relation when the control signal exceeds a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.