Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Reexamination Certificate
2006-01-17
2006-01-17
Sircus, Brian (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
C361S093800
Reexamination Certificate
active
06987655
ABSTRACT:
Thermal overload protection circuitry14for an automotive ignition system includes a gate drive circuit (18) responsive to a control signal (ESTB) to produce a drive signal (VGD) for driving a power switching device (22) separate from the protection circuitry (14), and a thermal overload protection circuit (40) configured to supply a first current (I1) to a thermal sensing component (38) associated with, and having an operating temperature defined by, the power switching device (22), wherein the first current (I1) has a magnitude defined by the operating temperature of the thermal sensing component (38). The first current is multiplied by a current controlled current source (60) to produce a second current (I2), and the second current is used to limit the drive signal (VGD) to thereby maintain the operating temperature of the power switching device (22) below an operating temperature limit.
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Horowitz et al. The Art of Electronics, 2001, Cambridge University Press, 335, 337-339.
Beyler Duane E.
Fruth John R.
Kesler Scott B.
Kitov Z
Sircus Brian
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