Over voltage and surge voltage preventing circuit
US7002783B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 2002 |
| Grant date | Feb 21, 2006 |
| Priority date | — |
| Expiry date | Dec 22, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An over voltage and surge voltage preventing circuit for a display module includes resistors that divide an input voltage. A first switching device is turned on when a voltage-divided value made by the resistors is larger than a reference voltage. A second switching device is connected to an output terminal of the first switching device to carry out a switching operation contrary to the first switching device. A third switching device has a control terminal connected to an output terminal of the second switching device to carry out the same switching operation as the second switching device, thereby shutting off said over voltage to output only a normal input voltage. A time constant circuit delays an input voltage supplied from a turn-on time of the power supply by a predetermined time constant to prevent a generation of surge voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.