Dual PWM Actuation in Assembly

A colleague described a customer need over the phone to me. The customer had an actuator that was controlled by two PWM signals that had to be 90 degrees out of phase with each other. The actuator was also reversible, so it would operate in the forward direction when signal 1 led signal 2 by 90 degrees, and it would operate in the reverse direction when signal 2 led signal 1 by 90 degrees.