| 摘要 |
<p>A fluorescent lamp dimming circuit for DC fluorescent lighting circuits of the type using a battery voltage source and an inverter. The dimming circuit comprises an electronic switch (24) connected between the battery (18) and the inverter (16) and an oscillator (26) is provided to periodically actuate the electronic switch to reduce the on-time of the lamp current. A timer (30) is connected with the oscillator (26) to disable the dimming circuit for a preset time interval after the lamp has been turned on by an on/off switch (20). Thus, the lamp is started at full intensity upon each start-up and after the time delay the dimmer circuit is effective to reduce the intensity. </p> |
