Circuit for detecting an open load

Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude

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Details

327535, 327 78, 327 63, 361 18, 361 42, G05F 1573, H02H 3087

Patent

active

054382866

ABSTRACT:
A circuit for the detection of an open load for a power MOS transistor is designed to operate in a switching mode. The MOS transistor is partitioned into two transistors disposed in parallel. The second transistor has a resistance in the conductive state higher than the first transistor. The circuit includes circuitry for enabling only the second transistor when the current is within a low value range, and circuitry for detecting an open load when the circuit is operating within the low current range.

REFERENCES:
patent: 4528608 (1985-07-01), Andersson et al.
patent: 5004970 (1991-04-01), Baron
patent: 5079456 (1992-01-01), Kotowski et al.
patent: 5105101 (1992-04-01), Hinooka
patent: 5187632 (1993-02-01), Blessing
patent: 5220207 (1993-06-01), Kovalcik et al.
patent: 5272392 (1993-12-01), Wong et al.

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