1. An external charger for wirelessly providing energy to an implantable medical device (IMD), comprising:a charging coil configured when energized by a drive signal to produce a magnetic field to wirelessly provide energy to the IMD;
a sense coil, wherein the sense coil is configured to be induced by the magnetic field with an induced signal affected by a position of the charging coil with respect to the IMD; and
control circuitry configured to
determine a phase angle between the induced signal and the drive signal, and
determine using the phase angle the position of the charging coil with respect to the IMD.