| 摘要 |
A lighting arrangement comprises: a) an array of plural pairs of series-connected fluorescent lamps, with each lamp pair: i) adapted to be powered from 30 kHz/240 Volt by way of a high-Q series-resonant L-C circuit, ii) receiving cathode heating by way of transformer connected with the 30 kHz/240 Volt, iii) connected in parallel with the capacitor of the L-C circuits and iv) connected in parallel with a circuit protection means operative to limit the magnitude of the voltage that can develop across the capacitor of the L-C circuit as a result of Q-multiplication, and -in response to a control signal, or in case the lamp pair fails to start within a reasonably short time-to place a short circuit across the capacitor; b) a frequency converter connected with a power line and operable to provide the 30 kHz/240 Volt; and c) programming means connected with each circuit protection means and operable: i) before providing 30 kHz/240 Volt to the array, to provide a signal to all circuit protection means, thereby placing a short circuit across each capacitor, ii) whenever it is desired that the array be activated to provide light, to remove the signal, but not until after a minimum period of about one second after the 30 kHz/240 Volt was applied, iii) whenever it is desired that the array should be deactivated, to re-provide the signal, and iv) to remove and/or re-provide the signal thereafter in accordance with any desired program.
|
