Battery-operated power supply unit
US6687102B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2001 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Apr 24, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/08142
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The battery-operated power supply unit, which comprises a switching transistor whose current terminals are connected in series with a battery, in the current path of the power supply unit, comprises a protective circuit, which is arranged across the current terminals of the switching transistor and evaluates the differential voltage across the switching transistor. The switching transistor is in particular a MOSFET with a parallel-connected internal diode. In the event of too high a differential voltage, the power supply unit or an appliance connected downstream is switched off, so that the switching transistor is not destroyed in the event of a fault. The protective circuit contains, in particular, a threshold circuit with a transistor whose base and emitter are connected across the current terminals of the switching transistor and whose base bias voltage is set via a voltage divider in such a way that, in the event of too high a differential voltage, the transistor switches on and, in this way, triggers a turn-off signal via the collector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.