Circuit configuration for limiting the cutoff voltage on a servomotor
AssigneeAlfred Teves GmbH
InventorsHeinz Loreck, Mario Engelmann
Life of this patent
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Abstract
A circuit configuration for limiting the cutoff voltage occurring in controlling a servomotor (M) by means of width-modulated DC pulses comprises a power transistor (T2) which, via a capacitor (C) is connected through for a short time when a cutoff voltage appears thus limiting the cutoff voltage. Subsequently the transistor (T2) presents a high impedance. As a result a short-circuiting of the servomotor (M) will be prevented in the phase in which a spring force resets the servomotor into its zero position.
Claims12
A circuit configuration for limiting the cutoff voltage occurring in controlling a servomotor by means of width-modulated direct-current pulses, characterized in the a so-called free-wheel diode is connected in series with a transistor and in parallel with the servomotor, the control electrode of the transistor being connected to the servomotor via a capacitor so that the transistor is connected through for a short time upon the appearance of the cutoff voltage.
A circuit configuration for limiting the cutoff voltage occurring in controlling a servomotor by mean of width-modulated direct-current pulses, said circuit configuration comprising:
- a transistor having a control electrode;
- a free-wheel diode connected in series with said transistor and adapted for connection in parallel with a servomotor;
- a capacitor connected between said control electrode of said transistor and the connection of said free-wheel diode to said servomotor;
- and means for conducting a cutoff voltage through said capacitor to said transistor to effect a through connection by said transistor upon the appearance of said cutoff voltage.
Dependencies are inferred from the claim text.