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 comprising: - Applying to the external transmitting device electrical pulses from a first electric circuit, comprising a pulse generator and a pulse length and interval control unit, 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, and - 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, characterized by, in the step of applying to the external transmitting device electrical pulses from the first electric circuit, comprising the pulse generator and the pulse length and interval control unit, to transmit the wireless energy: - supplying two or more pulse trains in a row, wherein supplying each pulse train comprises - supplying a train of two or more of the electrical pulses in a row, said train having a first electrical pulse at the start of the pulse train and having a second electrical pulse at the end of the pulse train, and wherein a frequency and pulse width of the two or more pulses of a first pulse train of the two or more pulse trains are the same as a frequency and pulse width of the two or more pulses of a second pulse train of the two or more pulse trains, and - varying the lengths of the second time intervals between successive trailing edge of the second electrical pulse in the first pulse train and leading edge of the first electrical pulse of the second pulse train. - Applying to the external transmitting device electrical pulses from a first electric circuit, comprising a pulse generator and a pulse length and interval control unit, 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, and - 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, characterized by, in the step of applying to the external transmitting device electrical pulses from the first electric circuit, comprising the pulse generator and the pulse length and interval control unit, to transmit the wireless energy: - supplying two or more pulse trains in a row, wherein supplying each pulse train comprises - supplying a train of two or more of the electrical pulses in a row, said train having a first electrical pulse at the start of the pulse train and having a second electrical pulse at the end of the pulse train, and wherein a frequency and pulse width of the two or more pulses of a first pulse train of the two or more pulse trains are the same as a frequency and pulse width of the two or more pulses of a second pulse train of the two or more pulse trains, and - varying the lengths of the second time intervals between successive trailing edge of the second electrical pulse in the first pulse train and leading edge of the first electrical pulse of the second pulse train. - supplying two or more pulse trains in a row, wherein supplying each pulse train comprises - supplying a train of two or more of the electrical pulses in a row, said train having a first electrical pulse at the start of the pulse train and having a second electrical pulse at the end of the pulse train, and wherein a frequency and pulse width of the two or more pulses of a first pulse train of the two or more pulse trains are the same as a frequency and pulse width of the two or more pulses of a second pulse train of the two or more pulse trains, and - varying the lengths of the second time intervals between successive trailing edge of the second electrical pulse in the first pulse train and leading edge of the first electrical pulse of the second pulse train.