Time responsive variable voltage power supply
US4396869A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1980 |
| Grant date | Aug 2, 1983 |
| Priority date | — |
| Expiry date | Aug 27, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M5/2576
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A variable voltage power supply includes a switching device through which line AC current is passed in response to the time during which a level setting voltage is applied to a control circuit for the switching device. During the duration of the level setting signal, periodic electrical signals are applied to a counter which is cyclicly incremented and decremented between predetermined lower and upper count limits until the level setting signal is terminated. The count is used as a measure of time into each half cycle of the line AC voltage at which the switch device is closed, the switch device being opened in response to the zero voltage crossing at the end of each half cycle of the AC voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.