Control circuit for power converter
AssigneeCommissariat à I'Énergie Atomique et aux Énergies Alternatives
InventorsRomain Grezaud, François Ayel, Jean-Christophe Crebier, Nicolas Rouger
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Abstract
A circuit for controlling a first field-effect transistor of a power converter, intended for a converter including at least one first and one second transistor connected in series between two terminals for applying a first voltage, the circuit including a circuit for detecting the opening of the second transistor.
Claims6
A circuit for controlling a first field effect transistor of a power converter, intended for a converter comprising at least a first and a second transistor series-connected between two terminals of application of a first voltage, said circuit comprising:
- an output terminal intended to be connected to the gate of the first transistor;
- and
- an input terminal intended to be connected to the source of the first transistor;
- two control transistors series-connected between two terminals of application, respectively, of a first power supply voltage which is positive or zero with respect to the potential present on said input terminal and of a second power supply voltage which is negative or zero with respect to said potential of the input terminal, the junction point of the two series-connected control transistors being connected to the gate of the first transistor;
- a control terminal intended to receive a signal for controlling the turning on or off of the first transistor;
- a circuit for detecting a variation of the drain-source voltage due to the turning-off of the second transistor, the detection circuit being connected to the gate of the first transistor and detecting a variation of the gate current or of the gate-source voltage of the first transistor when the control circuit is in a first operating mode, called monitoring mode, where the two control transistors are off, placing the gate of the first transistor in a high-impedance state;
- and
- a logic block for combining said control signal and at least one signal supplied by said detection circuit to control the turning on or off of each of the control transistors.
A power converter comprising at least a first and a second transistor,
- series-connected between two terminals of application of a first voltage, wherein the first and second transistors are each controlled by the circuit of any of the foregoing claims.
Dependencies are inferred from the claim text.