Load open state detection using H-bridge driving circuit

Details Load open state detection using H-bridge driving circuit Load open state detection using H-bridge driving circuit

1995-05-15

1997-01-07

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324210, 324523, 360 31, 361 93, G01R 3102

Patent

active

055920977

ABSTRACT:
A load open state detection circuit includes a driver having X and Y terminals between which an inductive load is connected and which receive drive signals, a first transistor whose base is connected to the X terminal and whose collector is connected to a terminal supplied with a predetermined voltage, a second transistor whose base is connected to the Y terminal and whose collector is connected to the terminal supplied with a predetermined voltage and third and fourth transistors having bases thereof connected to input terminals supplied with respective drive signals. A fifth transistor has a base connected to the base of the first transistor, a collector connected to a resistor which is in turn connected to the collector of the first transistor, and an emitter connected to a second resistor which is connected to the emitter of the first transistor. A sixth transistor is provided, having a base connected to the base of the fourth transistor and a collector and emitter connected through respective resistors to the collector and emitter of the fourth transistor, respectively. A logic gate circuit receives voltages of the collectors of the fifth and sixth transistors to determine whether or not a load current flows between X and Y terminals to thereby detect whether the load is in a normal or an open state.

REFERENCES:
patent: 4203137 (1980-05-01), Beck et al.
patent: 4736267 (1988-04-01), Karlmann et al.
patent: 4746869 (1988-05-01), Schrag et al.
patent: 4862078 (1989-08-01), Kawabata
patent: 4890183 (1989-12-01), Champiau
patent: 5087884 (1992-02-01), Brannon

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