Commutator containing a semiconductor with unidirectional current and bidirectional voltage, and with controlled interruption and automatic ignition
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United States of America Patent
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Feb 10, 1987
Grant Date -
N/A
app pub date -
Apr 19, 1985
filing date -
Apr 20, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention pertains to a commutator containing a semiconductor operable with unidirectional current and bidirectional voltage and with controlled interruption and automatic ignition, and in which a semiconductor device with controlled commutation is utilized. In accordance with the invention, the commutator includes a logic gate (61) having an input which, when the anode-to-cathode voltage of the semiconductor device (2) is below a specific positive voltage close to zero, receives a logic signal from an adapting circuit (4) connected to the semiconductor anode. The other input of the logic gate receives a control logic signal, and the output of the gate is connected to another adapting circuit (5) which converts the logic signal output by the logic gate into a suitable control signal which is transmitted to a the control terminal of the semiconductor device (2). In a preferred embodiment the logic gate (61) is a 'NOR' gate and the semiconductor device (2) is a thyristor with controlled commutation, known as a G.T.O. thyristor.
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