Control of an anode-gate thyristor
AssigneeSTMicroelectronics (Tours) SAS
InventorsGhafour Benabdelaziz, Romain Pichon
Life of this patent
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Abstract
A circuit for controlling an anode-gate thyristor includes a first transistor that couples a thyristor gate to a first terminal to receive a potential lower than a potential of a second terminal connected to the thyristor anode. A control terminal of the first transistor is driven by a control signal which is positive with respect to the potential of the first terminal.
Claims24
A circuit for controlling an anode-gate thyristor for rectification of an AC voltage signal, comprising:
- a first transistor coupling a gate of the anode-gate thyristor to a first terminal which is at a first potential;
- wherein the first potential is lower than a second potential at a second terminal, wherein the second terminal is connected to an anode of the anode-gate thyristor;
- a second transistor coupling a control terminal of the first transistor to a third terminal to receive a third potential which is positive with respect to the second potential of the second terminal;
- a voltage regulator coupled between the third terminal and a fourth terminal;
- a diode having an anode directly electrically connected to the first terminal and a cathode directly electrically connected to the second terminal;
- and
- a resistor directly electrically connected between the second terminal and the fourth terminal.
A circuit for controlling an AC load connected in series with an anode-gate thyristor between first and second nodes which receive an AC voltage signal, comprising:
- a first transistor coupling a gate of the anode-gate thyristor to a first terminal at a first potential, wherein the first potential is lower than a second potential at the second node which is connected to an anode of the anode-gate thyristor;
- a second transistor coupling a control terminal of the first transistor to a third terminal to receive a third potential which is positive with respect to the second potential;
- a voltage regulator coupled between the third terminal and a fourth terminal;
- a diode having an anode directly electrically connected to the first terminal and a cathode directly electrically connected to the second node;
- and
- a resistor directly electrically connected between the second node and the fourth terminal.
A circuit, comprising:
- first and second AC terminals receiving an AC voltage signal for rectification;
- a first branch comprising:
- a first thyristor having a cathode connected to the first AC terminal, an anode connected to a ground node, and a first gate;
- and
- a first transistor having a collector coupled to the first gate, an emitter coupled to a first terminal at a first potential, and a base;
- a second transistor coupling the base of the first transistor to a third terminal to receive a third potential which is positive with respect to the ground node;
- and
- a second branch comprising:
- a second thyristor having a cathode coupled to the second AC terminal, an anode connected to the ground node, and a second gate;
- a third transistor having a collector coupled to the second gate, an emitter coupled to the first terminal at the first potential, and a base;
- a voltage regulator coupled between the third terminal and a fourth terminal;
- a diode having an anode directly electrically connected to the first terminal and a cathode directly electrically connected to the ground node;
- and
- a resistor directly electrically connected between the ground node and the fourth terminal.
A circuit for controlling an anode-gate thyristor for rectification of an AC voltage signal, comprising:
- a first transistor coupling a gate of the anode-gate thyristor to a first terminal which is at a first potential;
- wherein the first potential is lower than a second potential at a second terminal, wherein the second terminal is connected to an anode of the anode-gate thyristor;
- a second transistor coupling a control terminal of the first transistor to a third terminal to receive a third potential which is positive with respect to the second potential of the second terminal;
- a voltage regulator coupled between the third terminal and a fourth terminal;
- a diode having an anode directly electrically connected to the first terminal and a cathode directly electrically connected to the second terminal;
- and
- a resistor directly electrically connected between the second terminal and the fourth terminal.
Dependencies are inferred from the claim text.