Apparatus controlled by a microprocessor
US4304003A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1979 |
| Grant date | Dec 1, 1981 |
| Priority date | — |
| Expiry date | Oct 19, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2231/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A control circuit using a microprocessor comprises a time counting circuit; a main control logic circuit receiving a time signal from the time counting circuit; and an AC signal generator receiving a first signal from the time counting circuit and a second signal from the main control logic circuit. When the microprocessor is out of order, the AC signal takes continuous "1" or "0" level. The control circuit further comprises a detecting circuit for detecting an abnormal state of the AC signal and a control circuit for maintaining an apparatus to be controlled by the control circuit in a predetermined safe state when the detecting circuit detects the abnormal state of the AC signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.