Over-voltage protection circuit
US7274543B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 2003 |
| Grant date | Sep 25, 2007 |
| Priority date | — |
| Expiry date | Mar 31, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An over-voltage protection circuit for protecting an integrated circuit includes an external power supply terminal to which a power supply voltage is supplied, a grounding terminal to which a ground voltage is supplied, and an internal power supply terminal for supplying the power supply voltage to the integrated circuit. A voltage dividing unit is connected between the external power supply terminal and the grounding terminal for dividing a voltage supplied from the external power supply terminal, and has a Zener diode and a first resistor connected in series. A signal generating unit is connected between the external power supply terminal and the grounding terminal for outputting the power supply voltage or the ground voltage, and a switching unit is connected between the internal power supply terminal and the signal generating unit for performing a switching operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.