Marginal Device Performance Check for Pulse-Width Modulation Control Systems
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Because of the availability of low-cost digital logic, pulse-width modulation (PWM) has been increasingly utilized to control power input to electromechanical devices. The failure mode in most such devices causes more and more power to be required to maintain some nominal condition or performance. Specifications for a device may include valid ranges for PWM. Devices approaching range limits over a period of time may be flagged as failing by software, whereas no visible indication of error is possible (i.e., the device still performs adequately but requires more power, thus a greater width on the pulses which are used to modulate the device).