Load dump protection for power FET device
First Claim
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1. A load dump protection system operable to provide protection for a power transistor used to drive a blower motor of a vehicle, said load dump protection system comprising:
- said power transistor connected in series with a load;
circuitry for detecting an over-voltage transient, said circuitry adjusting a drive transistor into a saturation mode in response to a detection of an over-voltage transient, said circuitry lowering the power dissipated by said drive transistor when said drive transistor is in said saturation mode; and
wherein said circuitry adjusts an op-amp circuit to turn said power transistor fully on by applying a maximum voltage to a gate of said power transistor in said over-voltage transient condition drive transistor to adjust said drive transistor to said saturation mode.
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Abstract
A load dump protection system is operable to provide protection for power transistors used to drive a blower motor of a vehicle. The load dump protection system includes circuitry for detecting an over-voltage transient. The circuitry adjusts a drive transistor into a saturation mode in response to a detection of an over-voltage transient. The circuitry lowers the power dissipated by the drive transistor when the drive transistor is in the saturation mode.
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Citations
8 Claims
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1. A load dump protection system operable to provide protection for a power transistor used to drive a blower motor of a vehicle, said load dump protection system comprising:
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said power transistor connected in series with a load; circuitry for detecting an over-voltage transient, said circuitry adjusting a drive transistor into a saturation mode in response to a detection of an over-voltage transient, said circuitry lowering the power dissipated by said drive transistor when said drive transistor is in said saturation mode; and wherein said circuitry adjusts an op-amp circuit to turn said power transistor fully on by applying a maximum voltage to a gate of said power transistor in said over-voltage transient condition drive transistor to adjust said drive transistor to said saturation mode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A load dump protection system operable to provide protection for a power transistor used to drive a blower motor of a vehicle, said load dump protection system comprising:
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said power transistor connected in series with a load; circuitry for detecting an over-voltage transient, said circuitry adjusting a drive transistor into a saturation mode in response to a detection of an over-voltage transient, said circuitry lowering the power dissipated by the drive transistor when said drive transistor is in said saturation mode; and wherein said circuitry comprises a comparator that compares an incoming battery voltage to a high voltage threshold and said circuitry adjusts said drive transistor to said saturation mode in response to an output of said comparator when the incoming battery voltage is greater than said high voltage threshold, and wherein said circuitry adjusts an op-amp circuit to turn said power transistor fully on by applying a maximum voltage to a gate of said power transistor in said over-voltage transient condition. - View Dependent Claims (8)
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Specification