Patent ID: 9196135
Filing Date: 2015-11-24
Classification: G08B

Abstract:
1. A drive circuit for an actuator, the drive circuit comprising: a voltage input and ground source input; a desired current signal input; a current probe coupled to the circuit between the voltage input and ground and configured to measure a current level for the actuator and output an actual current signal; a gate coupled to the desired current signal and the actual current signal, the gate configured to compare the desired current signal to the actual current signal and output a switch signal based on the comparison; and a switch comprising a switch input coupled to the switch signal, a first leg coupled to the voltage input, and a second leg coupled to the ground source, wherein: the gate is configured to cause the switch to interrupt power from the voltage input to the ground when the comparison indicates that the actual current signal is greater than the desired current signal, and the actual current signal comprises a haptic signal.