Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1982-09-13
1985-11-05
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307241, 307270, 307300, H03K 1760, H03K 326
Patent
active
045516359
ABSTRACT:
Disclosed is an isolation circuit for a power transistor that enables a control circuit to turn the power transistor on and off, while insulating the control circuit from DC currents that may flow to or from the power transistor. The isolation circuit includes a first pulse transformer for receiving a pulse string signal corresponding to an ON command signal from the control circuit to alternatingly energize and de-energize the first pulse transformer. In addition, the isolation circuit includes a fast circuit path comprising a pair of serially connected diodes coupled between the secondary winding of the first pulse transformer and the base resistor of the power transistor for rapidly supplying base current drive to the transistor as soon as the first pulse transformer is energized. Also included in the isolation circuit is a base drive maintaining circuit coupled to the fast circuit path and to the base resistor of the power transistor. The maintaining circuit includes a capacitor that charges while the first pulse transformer is energized and discharges to supply base current drive to the power transistor when the first pulse transformer is de-energized. Furthermore, the isolation circuit includes a second pulse transformer for receiving a pulse signal corresponding to an OFF signal from the control circuit. The secondary winding of the second transformer being coupled to the base drive maintaining circuit for discharging the capacitor and terminating the base current drive to power transistor when the pulse signal corresponding to the OFF signal is received.
REFERENCES:
patent: 3144563 (1964-08-01), Cohler et al.
patent: 3927332 (1975-12-01), McKeon et al.
patent: 3959669 (1976-05-01), Peters
Davis B. P.
Fuji Electric Company Ltd.
Miller Stanley D.
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