| 摘要 |
An EL lamp is charged to a first polarity with a series of high voltage pulses, discharged at a controlled rate, charged to a second polarity with a series of high voltage pulses, and discharged at a controlled rate, thereby producing an alternating current through the lamp. A flyback circuit provides the high voltage pulses. The polarity of the pulses is reversed periodically at a low frequency and the EL lamp is prevented from discharging through the flyback circuit by a phase shift circuit that produces a discharge pulse in advance of each change of polarity of the high voltage pulses. The discharge pulse interrupts the high voltage pulses and discharges the EL lamp through a constant current load.
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