Failsafe control circuit for electrical appliances

Details Failsafe control circuit for electrical appliances Failsafe control circuit for electrical appliances

2007-03-06

2007-03-06

Pham, Thomas (Department: 2121)

Data processing: generic control systems or specific application

Generic control system, apparatus or process

Having protection or reliability feature

C714S024000, C326S014000

Reexamination Certificate

active

10900679

ABSTRACT:
Failsafe control circuit for electrical appliances whereby at least one electrical load (10) is activated, the control circuit comprising logic control means (1), operation switching means (8) between said electrical load (10) and a supply voltage (V), and a first drive circuit (6) which receives a first command signal (4) from the logic control means (1), said first drive circuit (6) acting on said operation switching means (8). It also comprises security switching means (9) between the electrical load (10) and the supply voltage (V), and a second drive circuit (7) which receives a second command signal (5) from the logic control means (1), said second drive circuit (7) acting on the security switching means (9) so that it closes said security switching means (9) only if said second command signal (5) is a pulse signal.

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