Output transistor driver diagnostic system

Details Output transistor driver diagnostic system Output transistor driver diagnostic system

1983-06-13

1985-08-27

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

340635, G01R 3126, G08B 2100

Patent

active

045381062

ABSTRACT:
An apparatus for diagnosing the operation of a plurality of output transistor drivers includes a plurality of detection transistors, a reference resistor and a voltage detector. Each detection resistor is coupled from a collector of one output transistor driver to a common node. The reference resistor is coupled between the common node and a ground potential. The voltage detector measures voltage across the reference resistor to determine the existence of an improperly functioning transistor. The test method includes turning off all the transistor drivers, detecting the voltage, and comparing the voltage to a reference voltage to determine if any transistors are shorted. If there are no shorts, the transistors are sequentially turned on to determine if any transistors are open.

REFERENCES:
patent: 2764753 (1956-09-01), Martin
patent: 3527987 (1970-09-01), Havlicek
patent: 3824390 (1974-07-01), Magyar

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