Protecting circuit against short-circuit of output terminal of AC adapter
US6788503B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2002 |
| Grant date | Sep 7, 2004 |
| Priority date | — |
| Expiry date | Apr 12, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0029
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A protecting circuit against short-circuit of an output terminal of an AC adapter, includes a current output switching transistor in which a power source is connected to an emitter thereof and an output terminal is connected to a collector thereof, a first switching transistor which is turned on when a controlled constant-voltage is over an available range of a voltage difference between a voltage of said power source and an output voltage, a second switching transistor which is connected to be turned on when the first switching transistor is turned on, a switch control amplifier which controls a switching operation so that the current output switching transistor is turned off when a voltage of the power source is a predetermined voltage or less, and a constant-current control amplifier which controls a constant current when the second switching transistor is turned on and enters a protecting operation state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.