Patent ID: 8983095
Filing Date: 2015-03-17
Classification: H04R

Abstract:
1. A driver circuit for driving a load by applying first and second digital PWM signals to the load, comprising an anomaly detection circuit, the anomaly detection circuit comprising: a first no-edge detection circuit for activating a first no-edge detection signal in response to detecting that the first digital PWM signal changes state within a first predetermined period of time; a second no-edge detection circuit for activating a second no-edge detection signal in response to detecting that the second digital PWM signal changes state within said first predetermined period of time; and a logic circuit for activating a reset signal in response to both said first and second no-edge detection signals being inactive, wherein the logic circuit further has an input for receiving a coincidence signal indicative of a coincidence in logic state of said first and second digital PWM signals when said first and second no-edge detection signals are inactive, the anomaly detection circuit outputting an anomaly detection signal in response to said reset signal being inactive for a second predetermined period of time.