In a sensing-to-actuation chain, which statement best describes the role of an actuator driver?

• A. The actuator driver converts a control signal into a form to energize the actuator and provides sufficient current.
• B. The actuator driver monitors system health.
• C. The actuator driver directly computes the control law.
• D. The actuator driver is the sensor itself.

Answer: (A)

Actuator drivers are the power interface between the controller output and the actuator. They take the controller’s signal—often a PWM, voltage, or current command—and convert it into the electrical energy the actuator needs, delivering the right voltage, current, and switching timing to energize it.

This role also includes protecting and enabling the actuator: handling higher power than the control electronics can supply, limiting current, and managing issues like back-EMF or overcurrent to keep everything safe and reliable. By isolating the high-power actuation from the low-power control logic, the driver lets the controller operate with simple logic signals while the actuator gets proper power.

So the driver’s job is to translate a control signal into the form and amount of energy required to move the actuator, rather than performing control calculations, monitoring system health, or being the sensor itself.