Self-regulating power supply for micro electronic mechanical systems thermal actuators

A self-regulating power supply for a micro electronic mechanical systems thermal actuator, comprising:

• a power source;
• a monitor being configured to monitor voltage and current across a thermal actuator;
• and
• a controller being connected to the power source and the monitor,
• wherein the controller is configured to control power from the power source to a thermal actuator responsive to the monitored voltage and current across the thermal actuator,
• wherein the power from the power source is controlled responsive to resistance across the thermal actuator to provide a maximum displacement of the thermal actuator,
• wherein the resistance is calculated from the voltage and current monitored across the thermal actuator,
• wherein the controller is configured to ramp voltage across the thermal actuator and determine a maximum resistance point responsive to the monitor as the voltage is ramped, and
• wherein the maximum resistance point is determined responsive to one of determine a maximum monitored resistance value, determine when a slope of the monitored resistance equals zero, and determine when a trend of decreasing resistance occurs.