Integrated control circuit with a level shifter for switching an electronic switch
US5552731A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1995 |
| Grant date | Sep 3, 1996 |
| Priority date | — |
| Expiry date | Sep 18, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/161
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for controlling a power transistor connected in series with a load. The circuit comprises a control logic circuit which produces a signal at two levels with respect to a reference terminal, a level shifter connected between the control circuit and the power transistor, and which produces a signal at two levels referred to the node between the power transistor and the load. The level shifter includes a flip-flop the output of which controls the power transistor as well as two transistors driven by the control logic circuit to switch alternately and provide switching signals on the "set" and "reset" inputs of the flip-flop via two resistors. Two parasitic current generators inject current into the two resistors during the phase in which the power transistor is cut off. To prevent this current from causing unwanted switching of the flip-flop, a resistor connected to the "set" terminal of the flip-flop has a lower resistance than that of the other resistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.