Input Power Measurement Techniques for Single-Phase Digitally Controlled PFC Rectifiers

Accurate input power measurements for off-line power supplies are required for both time-of-use billing and system power management purposes. When a digitally controlled PFC is utilized at the front end of the power supply much if not all the information necessary to calculate the input power has already been sensed as digital control data. This paper investigates input power measurement techniques that use data already available from the digital PFC controller or downstream DC-DC controllers. Speci cally, three techniques are considered and short calibration routines resulting in accurate input power measurements are outlined.