Coil current limiting feature for an ignition coil driver module

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver

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H03B 100

Patent

active

061007285

ABSTRACT:
The ignition coil driver module of the present invention includes a control integrated circuit, formed of a low voltage semiconductor material, and a high current load driver integrated circuit, formed of a high voltage integrated circuit, housed within a common package. The high current load driver integrated circuit is responsive to a low voltage drive signal provided by the control integrated circuit to permit a load current to flow unrestricted through the load driver integrated circuit and an inductive load connected thereto. The control integrated circuit includes a sense resistor which receives the load current from the high current load driver integrated circuit, converts this current to a sense voltage, compares the sense voltage to a reference voltage generated within the control integrated circuit, and forces the low voltage drive signal to drop to a level which will limit the load current to a predetermined current value.

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