METHODS AND APPARATUS TO MEASURE A TRANSFER FUNCTION OF A CONTROL SYSTEM

摘要

Methods and apparatus to measure a transfer function of a control system are disclosed. An example method (10) includes receiving a first signal from the power supply (12) at a first point in the control loop at a digital signal processor (20), instructing the digital signal processor to add a reference signal having a predetermined frequency and a predetermined amplitude to the first signal to generate a combined signal in the digital signal processor, using the combined signal to generate a control signal for the power stage, sampling the control signal at a second point around the control loop in the digital signal processor to generate a sampled signal, comparing the sampled signal to the reference signal to determine a transfer function of the digital power supply, and displaying the transfer function on a user interface.