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公开(公告)号：DE3360755D1
公开(公告)日：1985-10-17
申请号：DE3360755
申请日：1983-03-03
Applicant: ELECTRONICS CORP AMERICA
Inventor： BALA JOHN L , ROSWELL CHARLES R
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公开(公告)号：CA1192982A
公开(公告)日：1985-09-03
申请号：CA422617
申请日：1983-03-01
Applicant: ELECTRONICS CORP AMERICA
Inventor： BALA JOHN L , BOSWELL CHARLES R JR
Abstract: A fail-safe device is disclosed for removing power from circuitry to be controlled upon the occurrence of an undesired operating condition. The device includes circuitry for generating a fail-safe signal that is normally within a predetermined frequency range unless there is an undesired operating condition. It also includes power control circuitry for supplying power to the circuitry to be controlled only when the fail-safe signal is within the predetermined frequency range. In a preferred embodiment, the circuitry for generating the fail-safe signal includes a programmable computer which regulates the circuitry to be controlled and which, unless there is an undesired operating condition, such as a failure of the computer, also generates a sequence of bits in which a predetermined pattern occurs at a known frequency. A comparator circuit compares this sequence of bits with the predetermined pattern and generates a variation in the fail-safe signal each time there is a match. In the preferred embodiment, the power control circuitry includes an electromechanical relay for supplying power to the circuitry to be controlled when that relay is turned on and relay actuating circuitry for keeping the relay turned on when the fail-safe signal is within the predetermined frequency range. The power control circuitry may also include latch-out circuitry for keeping the relay off once it has been turned off and reset circuitry for enabling the relay to be selectively turned on once it has been turned off.
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3.发明专利
公开(公告)号：CA1225732A
公开(公告)日：1987-08-18
申请号：CA474270
申请日：1985-02-14
Applicant: ELECTRONICS CORP AMERICA
Inventor： BALA JOHN L , MCCARRON MICHAEL , ZAPOLIN RICHARD E
Abstract: A fail-safe device for removing power from controlled circuitry upon the occurence of an undesired operating condition is disclosed. The fail-safe device includes means for detecting a short circuit in the controlled circuitry and for indicating the existence of an undesired operating condition if a short is detected. The fail-safe device further includes a non-volatile memory for retaining data through a power outage so that the existence of an undesired operating condition is remembered upon return of the power. The data stored in the non-volatile memory may also be useful in investigating an accident or malfunction. The fail-safe device still further includes a reset button which returns power after an undesired operating condition if it is momentarily depressed.
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