Drive circuit for actuating a shape-memory alloy actuator
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United States of America Patent
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Jul 12, 2016
Grant Date -
Sep 17, 2015
app pub date -
Oct 28, 2013
filing date -
Oct 29, 2012
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Abstract
Methods and apparatus are disclosed for actuating a shape-memory alloy actuator. An example method comprises a measurement phase, in which a voltage is applied across a bridge comprising a sense resistor to measure the resistance of the shape-memory alloy actuator, and a drive phase, in which a bypass unit is used to bypass the sense resistor while still driving current through the shape-memory alloy actuator in order to drive the shape-memory alloy actuator.
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