Common bus driver complementary protect circuit
US3938008A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1974 |
| Grant date | Feb 10, 1976 |
| Priority date | — |
| Expiry date | Sep 18, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/01855
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An over current protect circuit for a common bus driver having a complementary pair FET output includes a pair of AND circuits responsive to the gate-source and drain-source voltages for charging separate time integrating capacitors. If a threshold charge is reached a latch is triggered, which in turn disables the driver via a NAND gate and Inverter, and discharges the active capacitor. The latch is reset by dropping the driver enable line. As an alternative, high driver current may be sensed by placing a resistor in series with each output FET and charging the associated capacitor in response to a high current through the resistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.