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US 6,191,396 B1Granted
Heater abnormality detecting circuit
AssigneeFunai Electric Co., Ltd.
InventorKazuhiko Yamamoto
Life of this patent
Estimating the term…
Abstract
A heater abnormality detecting circuit includes a heater winding. A fly back pulse extracted by the heater winding is supplied to a heater through a heater resistor, and voltage-divided and supplied to a micro-computer. The micro-computer determines a normality or abnormality on the heater by determining whether or not it is inputted with the voltage-divided fly back pulse in a predetermined time period.
Claims6
An abnormality detecting circuit, comprising:
- a fly back pulse extracting means for extracting a fly back pulse out of a winding of a fly back transformer connected to energize a heater of a CRT;
- and
- a detecting means for receiving a fly back pulse extracted by said extracting means, said detecting means including means for determining an abnormality of said fly back transformer by detecting whether or not the fly back pulse has been inputted in a predetermined time period.
An abnormality detecting circuit, comprising:
- a fly back pulse extracting means for extracting a fly back pulse out of a winding of a fly back transformer, said winding being arranged to energize a heater of a CRT;
- and
- a detecting means connected to said fly back pulse and having an input for receiving a fly back pulse extracted by said extracting means, said detecting means including means for determining an abnormality of said fly back transformer by substantially immediately detecting whether or not the fly back pulse has been inputted in a predetermined time period.
Dependencies are inferred from the claim text.