Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-01-03
1997-04-22
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340635, 340638, 340654, 361 93, 361101, 364483, B60Q 100
Patent
active
056232543
ABSTRACT:
A drive circuit fault detection device comprising a discriminating circuit generating a digital signal, the level of which indicates a fault; and an identifying circuit generating a binary-coded signal indicating the type of fault, i.e. ground shorting of the drive circuit or an open load. The discriminating circuit comprises a resistive network connected to the output of the drive circuit, for generating a voltage indicating correct connection of the load or a fault on the drive circuit and a comparator for comparing the generated voltage with a reference voltage and supplying the digital signal at its output. The identifying circuit comprises a current mirror circuit generating an output voltage having two different logic levels in the event of short circuiting or an open load, respectively, and a combination circuit for generating the binary-coded output signal.
REFERENCES:
patent: 4420784 (1983-12-01), Chen et al.
patent: 4574266 (1986-03-01), Valentine
patent: 4736267 (1988-04-01), Karlman et al.
patent: 4750079 (1988-06-01), Fay et al.
patent: 5142432 (1992-08-01), Schneider
patent: 5153809 (1992-10-01), Murakami
Patent Abstracts of Japan, vol. 10, No. 316 (P-510) Oct. 28, 1986 & JP-A-61 127 010 (Mitsubishi Electric Corp.) Jun. 14, 1986.
Brambilla Massimiliano
Maggioni Giampietro
Driscoll David M.
Hofsass Jeffery
Lefkowitz Edward
Morris James H.
SGS--Thomson Microelectronics S.r.l.
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