Decoding method for induction type power supply system and related supplying-end module

A decoding method for a supplying-end module of an induction type power supply system where the supplying-end module includes a supplying-end coil is provided. The decoding method includes steps of: receiving and storing a plurality of trigger data, each corresponding to a resonant cycle of a coil signal on the supplying-end coil; determining a plurality of rising or falling features in the plurality of trigger data, and marking a plurality of anchor points at positions corresponding to the plurality of rising or falling features; determining whether distances between the plurality of anchor points comply with an encoding interval, to obtain a plurality of valid anchor points from the plurality of anchor points; and obtaining a plurality of data codes according to the plurality of valid anchor points.