Isolated MOSFET gate drive

Details Isolated MOSFET gate drive Isolated MOSFET gate drive

1994-09-12

1996-08-27

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307113, 327427, H01H 4700

Patent

active

055504124

ABSTRACT:
A transformer-based electrical circuit that isolates a low voltage level input control signal from a power switching device, such a MOSFET, is disclosed. The circuit includes a pair of complementary dual bipolar transistor configurations connected to the secondary winding of a pulse transformer. The low voltage input signal is connected to the primary winding of the transformer. A pair of resistor network transistor drivers connect to corresponding bipolar transistors, whose outputs connect to the gate terminal of the MOSFET. The drivers are also connected to the complementary transistor pairs. A resistive feedback network is connected between the gate terminal of the MOSFET and the complimentary transistor pairs. The feedback network latches the selected drive voltage to the gate of the MOSFET, thereby keeping it on or off irrespective of the fact that the pulse transformer may have saturated.

REFERENCES:
patent: 4423341 (1983-12-01), Shelly
patent: 4461966 (1984-07-01), Hebenstreit
patent: 4511815 (1985-04-01), Wood
patent: 4967101 (1990-10-01), Nakamura et al.
patent: 5019719 (1991-05-01), King
patent: 5055722 (1991-10-01), Latos et al.
patent: 5304863 (1994-04-01), Cargille
patent: 5422587 (1995-06-01), Pulvirenti et al.

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