Electromagnetic control circuit
US4447849A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1982 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Jul 1, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/725
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A control circuit is disclosed for limiting the polarity and duration of current flowing through an electromagnetic device which is coupled to an alternating current potential source. The control circuit is coupled in series with the electromagnetic device and a switch. The control circuit includes a gate controlled conduction device and circuitry which is utilized to selectively gate that device only during one positive half cycle following the closing of the switch. A second gate controlled conduction device is utilized to discharge a capacitor in timed relationship with the alternating current potential source and prevent recharging of that capacitor until the switch is opened and then closed again.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.