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| Number | Title | Issue Date |
| 7382208 | Operating method for the resonant operation of high-pressure lamps in longitudinal mode, and an associated system and electronic ballast The operating method is based on the simultaneous application of FM and AM. In this process, the fundamental frequency of the AM is derived from at least one, preferably the second, longitudinal mode. In continuous operation of the lamp, the color temperature is set... | 06/03/2008 |
| 7157867 | Operating method, electronic ballast and system for resonant operation of high pressure lamps in the longitudinal mode The operating method is based on the simultaneous use of FM and AM and is distinguished by passing through a number of steps which are used to find an optimum frequency for the AM and, in addition, to define an optimum AM level. An electronic ballast which has a mem... | 01/02/2007 |
| 6922114 | Operating method and system for the resonant operation of high-pressure lamps in longitudinal mode The operating method is based on the simultaneous application of FM and AM, and is distinguished by passing through three operating states, specifically a warm-up phase, an impressing phase and the continuous operation. In the warm-up phase, the f002_h... | 07/26/2005 |
