Control circuit with a level shifter for switching an electronic

Details Control circuit with a level shifter for switching an electronic Control circuit with a level shifter for switching an electronic

1995-09-18

1996-11-05

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327217, 327382, 327384, 327427, H03K 300, H03K 1716

Patent

active

055721567

ABSTRACT:
A control circuit for a power transistor, connected between two supply terminals in series with a load. The control 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, which produces a signal at two levels relative to the node between the power transistor and the load. The level shifter comprises a flip-flop the output of which controls the power transistor, and an electronic switch, for example a MOSFET transistor, connected between the "set" input of the flip-flop and the node and controlled by the "reset" input of the flip-flop in such a way as to be closed when the "reset" input is greater, by a predetermined value, than that of the node. The electronic switch prevents the parasitic current flowing through the set and reset inputs from erroneously switching the power transistor.

REFERENCES:
patent: 4498021 (1985-02-01), Uya
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," Electronic Applications 63:33-38, Dec. 1988, Paris, France .

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