Current limited for constant current for switching driving devices
US4725769A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1987 |
| Grant date | Feb 16, 1988 |
| Priority date | — |
| Expiry date | Apr 9, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/087
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The switching driving device with current limitation, operating reliably even with high switching frequencies, comprises a drive stage receiving at the input a timing clock signal at a preset frequency and generating at the output a drive signal synchronized with the timing clock signal, a power element connected at the input to the drive stage, receiving therefrom the drive signal and generating a load supply signal, a load fed by the power element, and a current sensor generating an overload signal when the current in the load has reached a preset threshold. The current limitation is obtained through a memory element connected to the current sensor and disabling the drive stage in the presence of the overload signal. In order to obtain a reliable operation, in the presence of the overload signal the drive stage is controlled at a switching frequency which is lower than the preset frequency of the timing clock signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.