Switching controller and control device for a low pressure fluorescent lamp
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United States of America Patent
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Jun 22, 1999
Issued Date -
N/A
app pub date -
Mar 5, 1997
filing date -
Jun 15, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A control device for a fluorescent lamp comprises two independent circuits based on a power transistor and a switching control circuit, series-connected between a high voltage and the ground. The power transistor has a diode that is reverse mounted between its two electrodes. The switching control circuit comprises a circuit for the detection of a voltage at the terminals of the diode greater than a voltage reference value and a circuit for the detection of the integral of the current flowing in the transistor that is greater than a current reference value corresponding to the power of the lamp.
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