DC operated electronic ballast for fluorescent light
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United States of America Patent
Stats
-
May 12, 1998
Grant Date -
N/A
app pub date -
Aug 18, 1995
filing date -
Aug 18, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for operating lamps, such as fluorescent lamps includes an input protection circuit, a filter, a DC to DC converter, a power output stage, a lamp connecting circuit and a control circuit. The control circuit includes a pulse width modulator, a multivibrator and a start/stop controller. The pulse width modulator varies the duty cycle of a control signal supplied to the DC to DC converter based on a feedback signal from the DC to DC converter. The multivibrator assists in the control of the DC to DC converter. The start/stop controller initiates the operation of the power output stage when an output of the DC to DC converter reaches a predetermined level and halts the operation of the power output stage if a failure is detected.
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