Wireless power transmission(WPT)realizes power transmission based on contactless mode.When the WPT system is operating

the relative position of the transmitting coil and the receiving coil may be offset

which will reduce the mutual inductance between the coils

and the system can not operate in the optimal working condition. Based on the trilateral positioning technology

a trilateral positioning algorithm based on centroid positioning and least square positioning is proposed

and a simulation model of the three-auxiliary-coil system is established.The simulation confirms that when the distance between the receiving coil and the auxiliary coil

d

1

≥ 84.53mm

the cross mutual inductance between the coil groups can be ignored.On this basis

the precise positioning of the transmitting coil is realized

which provides a basis for centring and improving the transmission performance of the transceiver coil.Simulation and experiments show the feasibility of the two proposed positioning algorithms.