Non-directional frequency generator spark prevention apparatus
US6310405A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 2000 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | Feb 10, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/60
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A non-directional frequency generator spark prevention apparatus including a plurality of electric connections connected with a direct current power source, i.e., brushes, and a commutator for converting direct current waveform inputted through the brushes into alternating current waveform by rotational movement thereof, and for outputting the alternating current waveform. A voltage pulse controlling part is connected between the brushes of the non-directional frequency generator, while having a resistor and a transistor which are connected in series with each other, and the transistor is operated synchronously with the rotation of the commutator of the non-directional frequency generator. By controlling the electric current to flow through the transistor during the brush-off period, a spark production during the brush-off period can be prevented. Further, by controlling the transistor to be turned off during a predetermined period between a predetermined time of the brush-off period to a predetermined time of the brush-on period, the electric current does not flow through the transistor at the beginning of the brush-on period, and accordingly, the spark production at the beginning…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.