Power transmission control device, power transmission system, electronic instrument, and non-contact power transmission system

摘要

A power transmission control device (20) provided in a power transmission device (10) of a non-contact power transmission system includes an amplitude detection circuit (28) that detects amplitude information that relates to an induced voltage signal of a primary coil (L1), an A/D conversion circuit (29) that performs A/D conversion of the amplitude information, and a control circuit (22). The A/D conversion circuit (29) performs A/D conversion of a detected voltage detected by the amplitude detection circuit (28) at a conversion timing and determines digital data relating to a reference threshold voltage, the conversion timing being a timing after a given period has expired from a timing when the detected voltage has exceeded a provisional voltage. The control circuit (22) performs at least one of data detection that detects data that has been transmitted from a power reception device (40) by means of load modulation, foreign object detection, and detachment detection using the digital data relating to the reference threshold voltage.