Flyback current dampening apparatus
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United States of America Patent
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-
Oct 8, 1991
Grant Date -
N/A
app pub date -
Nov 6, 1989
filing date -
Nov 6, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for dampening current in a coil has a switchable member which controls the current level in the coil and a flyback circuit that allows current in the coil to slowly dissipate when the switchable member changes from an 'ON' to an 'OFF' state. The flyback circuit has a high resistance when the switchable member changes from the 'ON' to the 'OFF' state so that the coil current is dampened as quickly as possible without creating a destructive voltage and low resistance when the switchable member is in the 'ON' state to conserve energy. A signaling device creates a voltage signal as a function of current passing through the flyback circuit and a receiving device varies the resistance of the flyback circuit in response to the voltage signal. The apparatus is particularly suited for use in a motor control circuit.
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