Integrated control circuit with a level shifter for switching an

Details Integrated control circuit with a level shifter for switching an Integrated control circuit with a level shifter for switching an

1995-09-18

1996-09-03

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327382, 327427, 327566, H03K 1716, H03K 300

Patent

active

055527310

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.

REFERENCES:
patent: 4677324 (1987-06-01), Ronan, Jr. et al.
patent: 4937468 (1990-06-01), Shekhawat et al.
patent: 4942309 (1990-07-01), Chieli
patent: 5105099 (1992-04-01), Routh et al.
patent: 5126603 (1992-06-01), Hattori
patent: 5134322 (1992-07-01), Bourgeois et al.
patent: 5365118 (1994-11-01), Wilcox
Anonymous, "Double circuit de commande pour MOSFET de puissance ou IGBT haute tension," Electronique Applications 63:33-38, Dec. 1988, Paris, France.

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