Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1978-06-05
1979-07-10
Hix, L. T.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
363135, H03K 336, H03B 706
Patent
active
041609212
ABSTRACT:
An improved, D.C. shut-off control circuit for a thyristor is provided by means of a transformer having a tapped primary which is connected between a D.C. supply and the thyristor and which has two secondary windings: one is used during shut off to generate an opposing magnetic field in the transformer core which cancels the magnetic field generated by the flow of current through the primary winding to the thyristor. When current to the first secondary winding is shut off, this secondary magnetic field collapses and causes a reverse current in the primary which effectively blocks current to the thyristor and simultaneously generates a voltage in the second secondary winding of the transformer which biases a transistor switch to connect the primary tap to the circuit ground, thereby using the magnetically induced voltage in the primary to reverse bias the thyristor and positively shut it off. In a modified embodiment, this shut-off sequence is operated repetitively and sequentially in an inverter circuit by means of interconnected transistor and diode switches.
REFERENCES:
patent: 3273046 (1966-09-01), Bedford
patent: 3324381 (1967-06-01), Back et al.
patent: 3354322 (1967-11-01), Eastop
patent: 3365640 (1968-01-01), Gurwicz
patent: 3548216 (1970-12-01), Burch
patent: 3549908 (1970-12-01), Houlne
patent: 3610963 (1971-10-01), Higgins
patent: 3641364 (1972-02-01), Rippel
patent: 3652874 (1972-03-01), Partridge
patent: 3701939 (1972-10-01), Petersen et al.
Burrell, deceased Charles W.
Burrell, executrix by Mildred G.
Dwyer James L.
Hix L. T,.
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