Current limiting circuit for high-speed low-side driver outputs

Details Current limiting circuit for high-speed low-side driver outputs Current limiting circuit for high-speed low-side driver outputs

2006-07-04

2006-07-04

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S389000, C327S427000

Reexamination Certificate

active

07071740

ABSTRACT:
A FET switching transistor for the solenoid coil of an ABS braking system can switched ON or OFF in no more than substantially 250 ns. A higher current biasing circuit for fast turn on of the FET switching transistor is disconnected when it is necessary to limit the current flowing therethrough, whether during the inrush current to the solenoid coil or due to a fault in the system. The high speed switching of the FET switching transistor causes ringing of the current through the transistor which causes the current detector circuit to exit the current control mode. A deglitch circuit prevents the current detector from exiting the current control mode, so that a timer can be used to turn off the FET switching transistor before it can be damaged by the heat generated during current limit operation.

REFERENCES:
patent: 5796278 (1998-08-01), Osborn et al.
patent: 5936387 (1999-08-01), Tabata et al.
patent: 6333665 (2001-12-01), Ichikawa

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