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NORMALLY CONDUCTING DUAL THYRISTOR |
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Principal Investigator: J-L. SANCHEZ
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TECHNICAL DESCRIPTION
The present invention describes a dual thyristor whose features are based on a conventional thyristor by applying the duality principle to current and voltage behaviors and to the control modes. While a thyristor forms a normally off one-way component for the current, which can be triggered by a control current or be self-triggering beyond a given voltage threshold, a dual thyristor forms a normally on switch which can be turned off by a control voltage or be self-locking beyond a given voltage threshold.
The present invention also describes a component with a normally on dual thyristor, which can be turned off by a voltage pulse on the control electrode, including a thyristor, a first depletion MOS transistor, whose gate is connected to the source, connected between the anode gate and the cathode of the thyristor, and a second enhancement MOS transistor, whose gate is connected to a control terminal.
In the prior art, the implementation of a system with a dual thyristor function has been obtained by associating a specific control circuit with a switching component. This solution has two disadvantages. First, it is always difficult to monolithically associate control circuits with a power component. Second, it is necessary to provide a bulky auxiliary power supply for the control circuit, which is expensive and may be sensitive to surrounding disturbances.
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