A method of transmitting wireless energy from an external energy transmitting device placed externally to a human body to an internal energy receiver placed internally in the human body. The method comprises applying to the external transmitting device electrical pulses from a first electric circuit to transmit the wireless energy, the electrical pulses having leading and trailing edges, varying the lengths of first time intervals between successive leading and trailing edges of the electrical pulses and/or the lengths of second time intervals between successive trailing and leading edges of the electrical pulses. The method further comprises transmitting wireless energy, the transmitted energy generated from the electrical pulses having a varied power, the varying of the power depending on the lengths of the first and/or second time intervals.
