| 摘要 |
A circuit for extending the life of fluorescent tubes driven from a power source subject to interruptions, which includes a uni-directional conducting elements inserted in the line from the power source, a separately powered power source of substantially lower voltage than the main power source but of sufficient voltage to maintain the fluorescent tube in conduction, a second uni-directional device connected between the secondary power source and the common junction of the first uni-directional device and the load. Further, the circuit may include a voltage sensor to determine whether or not the power is present on the primary power source, a timer to time the length of time during which power is missing, and means of disconnecting the secondary power source when such time is excessive.
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