TROUBLE DETECTING CIRCUIT
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United States of America Patent
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N/A
Issued Date -
Apr 30, 2009
app pub date -
Oct 20, 2008
filing date -
Oct 24, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A trouble detecting circuit includes (a) a loop circuit conducting a loop current to two discharge tube lamps in a normal state, in which the two discharge tube lamps are driven with two alternating driving voltages having phases reverse to each other by one or two secondary side windings of one or two transformers, and (b) a monitoring circuit monitoring a voltage between two points which are at a substantially same potential in a normal state in the loop circuit.
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