Keyboard anti-lockout circuit

Details Keyboard anti-lockout circuit Keyboard anti-lockout circuit

1990-07-16

1992-06-02

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit automatically reconnected only after the fault is...

307130, 361 86, H02H 3247, H01H 8312

Patent

active

051192640

ABSTRACT:
In a computer system accessible via a keyboard--in which the keyboard and system are supposed to reset automatically in reaction to power outages or other disturbances lasting for longer than a first period of time, in which the keyboard and system are generally unaffected by power outages or other disturbances lasting for less than a second period of time less than said first period, and in which lockouts can occur during system power outages or other disturbances lasting for a time greater than said second period and less than said first period--an anti-lockout circuit is interposed between a DC low voltage output port of the system and a DC voltage input port of the keyboard. This circuit is powered by the low DC voltage appearing at said output port and operates in response to small changes in that voltage to switchably interrupt transfer of that voltage to the keyboard input port. When the output voltage falls below a predetermined voltage level at which the system is required to reset itself, the subject circuit interrupts transfer of the output voltage to the keyboard and delays reinstatement of the transfer for a period of time at least sufficient to ensure that the keyboard circuits will reset.

REFERENCES:
patent: 4771356 (1988-09-01), Hastings

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