CIRCUIT AND METHOD FOR COIL CURRENT CONTROL
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United States of America Patent
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Issued Date -
Jul 23, 2020
app pub date -
Apr 8, 2020
filing date -
Oct 15, 2018
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Abstract
Circuits and methods to control a current in a coil are disclosed. The circuit and methods provide over-dwell protection and soft shut-down functionality to safely discharge the coil. The safe discharge of the coil is facilitated by a soft-start ramp signal that reduces the coil current gradually by controlling a switching device according. A profile of the soft-start ramp signal over time determines the gradual reduction. The profile of the soft-start ramp signal can be adjusted to set (i) an over-dwell period of the coil current, after which the coil current is shut down, and (ii) a soft shut-down period, over which the coil current is gradually reduced.
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