Input circuit for an electronic speed control unit

Details Input circuit for an electronic speed control unit Input circuit for an electronic speed control unit

F - Mech Eng,Light,Heat,Weapons

02

D

341/86, 317/5.3

F02D 11/10 (2006.01) B60K 31/08 (2006.01)

Patent

CA 1270050

ABSTRACT OF THE DISCLOSURE An improved input circuit for an electronic vehicle speed control unit is disclosed. An ignition current sensor coil is adapted to have a voltage differential signal induced therein each time an ignition pulse is generated by the vehicle engine. Electrical noise signals generated by the vehicle engine appear as common mode signals across the ignition current sensor coil. The ignition current sensor coil is connected at each end to a capacitor, both of which are connected to ground potential. The ends of the ignition current sensor coil are further connected to the inputs of a differential amplifier. The capacitors appear in a series loop with the ignition current sensor coil for the differential voltage signals and consequently, provide tuning for inductance. However, the capacitors appear in parallel with one another to ground potential with respect to the common mode noise signals, thereby providing high frequency noise rejection for the input circuit. The differential amplifier further rejects the common mode noise signal applied to the inputs thereof.

477993

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