FET and bipolar transistor bridge circuit for driving a load

Details FET and bipolar transistor bridge circuit for driving a load FET and bipolar transistor bridge circuit for driving a load

1989-10-04

1991-06-11

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307257, 307270, 307 101, 318293, H03K 1760, H03K 1774, H03K 301, B60L 100

Patent

active

050234935

ABSTRACT:
A bridge circuit (2) for driving a load such as an electric motor (36) in one direction or an opposite direction as desired, the circuit comprising first (4) and second (24) parallel arms for connection across an automobile battery supply voltage, each arm comprising an FET switch (6, 26) and a bipolar PNP transistor (8, 28) connected in series via mid-point nodes for connection across the load. In each arm the intrinsic diode of the field effect transistor and the base-emitter junction diode of the PNP transistor are arranged to conduct forward-biased current in opposite directions. In this way, no current path is provided through the arms of the bridge circuit in the event that the voltage supply to the circuit is reversed.

REFERENCES:
patent: 4112428 (1978-09-01), Dorsman
patent: 4683387 (1987-07-01), Jones et al.

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