Vital safety monitoring circuit
US4755692A · kind A · utility
1Cited by
0References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 9, 1987 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Jun 9, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB61L1/20
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vital safety monitoring circuit including an electromagnetic transformer for feeding periodic check signals into one leg of a balanced bridge network having a pair of input and output terminals. A solid-state switching circuit is connected across the pair of input terminals. An operational amplifier circuit is connected across the pair of output terminals. An optical coupler circuit is connected to the operational amplifier for producing output signals corresponding to the periodic check signals when the solid-state switching circuit is nonconductive and in the absence of a critical component or circuit malfunction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.