Circuit arrangement for operating electric lamps, and operating method for electric lamps
US5783911A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1996 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Jul 1, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a circuit arrangement for operating electric lam and an operating method for electric lamps. The circuit arrangement has an inverter ((Q1, Q2) with a switch-off device which switches off the inverter (Q1, Q2) in the case of an anomalous operating state. The switch-off device has a field-effect transistor (T1, T1') whose drain-source junction is arranged in the control circuit of an inverter switching transistor (Q2) and switches the control circuit of the inverter transistor (Q2) between a state which is of low resistance in normal operation and a state which is of high resistance in anomalous operation. After the occurrence of an anomalous operating state, it is advantageous to switch off synchronously with the blocking phase of the inverter transistor (Q2) in whose control circuit the field-effect transistor (T1, T1') is arranged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.