Electronic latch circuitry
US4787008A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1987 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | Mar 9, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B6/66
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A relay coil associated with a pair of contacts connects an electrical source to a load. Actuation of a coil sensing element by a trigger input signal supplies current to the coil. In response to the trigger input signal the load sensing element supplies a latch maintain signal to a switching element which becomes conductive to establish current flow to the load. As long as the load sensing element detects current to the load the switching element remains conductive for a "latched" state. Interruption of current to the load converts the elements to an "off" state until another trigger input signal is transmitted to the load sensing element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.