Self monitoring solid state switching system
US4599675A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1984 |
| Grant date | Jul 8, 1986 |
| Priority date | — |
| Expiry date | Jul 11, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/1844
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A solid state switching system for use with solenoid operated control valves, especially control valves for dangerous machinery including a light screen guard fitted for personnel protection. The switching system comprises two transistors in series with the solenoid coil. A self-checking monitoring system for monitoring the state of the two switches is provided. The monitoring system has a plurality of switching elements arranged in such a way that no single electrical fault can result in an inadvertent energization of the control valve. Specifically in the event that one of the switches is off while the other is still conducting, the monitoring system inhibits switching on of the switch that is off. The monitor system verifies that no fault has occurred during any one cycle of operation which might not otherwise be apparent. Every component in the switching and monitoring circuits functions during each on/off cycle. A logic interface is provided and only permits a subsequent cycle to commence when every monitor output from each switching system is satisfactory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.