Electronic speed control circuits
US4489263A · kind A · utility
7Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1983 |
| Grant date | Dec 18, 1984 |
| Priority date | — |
| Expiry date | Oct 17, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Circuit arrangements to improve the performance of motor speed control circuits using electronic switching on an AC waveform where it is desired to remotely control the electronic switch without either load current or the load waveforms being present at the controlling element. The voltage across the switching device, during the time it is off, is rectified, and used as the charging voltage for the phase firing circuit, with a resistor capacitor timing network determining the firing of the switching device when the capacitor voltage reaches a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.