Apparatus for detecting open circuits in parallel-wired thermo m

Details Apparatus for detecting open circuits in parallel-wired thermo m Apparatus for detecting open circuits in parallel-wired thermo m

1998-12-02

2000-08-29

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340640, 340660, 257712, G08B 1710

Patent

active

061115134

ABSTRACT:
The present invention provides open-circuit detection for detecting an open circuit in parallel-connected thermo modules. Plural rows 10a of plural series-connected thermo modules 11a, . . . 11n are connected in parallel. A detection circuit 12 is provided for each row 10a of modules to detect a change in voltage between a power terminal 17a and an intermediate terminal 18 caused by an open circuit. Switching circuits 20 in the detection circuits 12 are connected in series to an alarm circuit 14, so that if any detection circuit 12 detects an open circuit to preclude the corresponding switching element 20 from conducting, the alarm circuit 14 is activated to cause an alarm 32 to issue an alarm.

REFERENCES:
patent: 4519850 (1985-05-01), Weiss
patent: 4610142 (1986-09-01), Davis
patent: 5491362 (1996-02-01), Hamzehdoost et al.
patent: 5687474 (1997-11-01), Hamzehdoost et al.

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