Apparatus for preventing malfunction in a circuit controlling an

Details Apparatus for preventing malfunction in a circuit controlling an Apparatus for preventing malfunction in a circuit controlling an

1978-02-06

1980-08-12

Truhe, J. V.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318314, H02P 516

Patent

active

042175283

ABSTRACT:
The direction of current through a motor is controlled by a bridge circuit having four transistors each constituting one arm of the bridge. A first and second transistor receive the control signal for allowing current flow in the first and second direction respectively. To prevent the emf of the motor which maintains the previous direction for a short time after the switching of the current direction, from maintaining a previously conductive transistor in the conductive state, a first diode is connected between the first motor output terminal and the control electrode of the third transistor and a second diode is connected between the second motor output terminal and the control electrode of the fourth transistor. The polarity of the diodes is such that the residual emf is blocked from the respective control electrodes.

REFERENCES:
patent: 3896358 (1975-07-01), Tanikoshi

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