Commutator containing a semiconductor with unidirectional curren

Details Commutator containing a semiconductor with unidirectional curren Commutator containing a semiconductor with unidirectional curren

1985-04-19

1987-02-10

Wong, Peter S.

Electricity: power supply or regulation systems

External or operator controlled

Phase controlled switching using electronic tube or a three...

323211, 363137, 307252C, H03K 1772

Patent

active

046425535

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.

REFERENCES:
patent: 3622806 (1971-11-01), Williams
patent: 3992661 (1976-11-01), Kelley, Jr.
patent: 4356440 (1982-10-01), Curtiss et al.
patent: 4449088 (1984-05-01), Cutler et al.
patent: 4518867 (1985-05-01), Lamboley

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