Frequency sensing control device
US6157136A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2000 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Jan 11, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A frequency sensing control device controls current flow through an electrical load and includes a current control circuit to be connected to the electrical load, a logic signal generator having an input port and an output port connected to a control input of the current control circuit, an oscillator connected to the logic signal generator, and a sensing unit connected to the oscillator for sensing human presence. The current control circuit is operable in a normal mode, where the control input receives a first logic signal generated by the logic signal generator when the input port receives a high-frequency signal so as to enable the current control circuit to maintain an initial current flow through the electrical load, and a dimming mode, where the control input receives a second logic signal generated by the logic signal generator when the input port receives a low-frequency signal so as to enable the current control circuit to vary the current flow through the electrical load. The oscillator is operable so as to provide the high-frequency signal to the input port. The sensing unit generates the low-frequency signal, inhibits the oscillator from providing the high-frequency si…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.