Alternating voltage supply means for converting an energy-supplying direct voltage to a first alternating voltage and to a second alternating voltage galvanically separated from the first alternating voltage, the alternating voltage supply means including: a first voltage input and a second voltage input for receiving the energy-supplying direct voltage; a semiconductor switch comprising a first switching contact, a second switching contact, and a control contact, the second switching contact being electrically connected to the second voltage input; an inductive input element electrically connecting the first voltage input and the first switching contact; an inductive resonant element which electrically connects the first switching contact to a first contact of a first capacitive resonant element of the alternating voltage supply means that is associated with the first alternating voltage and to a first contact of a first capacitive resonant element of the alternating voltage supply means that is associated with the second alternating voltage; a second capacitive resonant element of the alternating voltage supply means, that is associated with the first alternating voltage, with a first contact electrically connected to the second switching contact; a second capacitive resonant element of the alternating voltage supply means, that is associated with the second alternating voltage, with a first contact electrically connected to the second switching contact; and a feedback means (18, 19, 20) with a third voltage input for receiving a direct reference voltage related to the second voltage input, with an inductive connection element electrically connecting the third voltage input and the control contact, and with a parasitic capacitance connecting the first switching contact and the control contact; wherein the feedback means (18, 19, 20) is configured such that the semiconductor switch oscillates, so that the first alternating voltage is applied between a second contact of the first capacitive resonant element associated with the first alternating voltage and a second contact of the second capacitive resonant element associated with the first alternating voltage, and so that the second alternating voltage is applied between a second contact of the first capacitive resonant element associated with the second alternating voltage and a second contact of the second capacitive resonant element associated with the second alternating voltage. a first voltage input and a second voltage input for receiving the energy-supplying direct voltage; a semiconductor switch comprising a first switching contact, a second switching contact, and a control contact, the second switching contact being electrically connected to the second voltage input; an inductive input element electrically connecting the first voltage input and the first switching contact; an inductive resonant element which electrically connects the first switching contact to a first contact of a first capacitive resonant element of the alternating voltage supply means that is associated with the first alternating voltage and to a first contact of a first capacitive resonant element of the alternating voltage supply means that is associated with the second alternating voltage; a second capacitive resonant element of the alternating voltage supply means, that is associated with the first alternating voltage, with a first contact electrically connected to the second switching contact; a second capacitive resonant element of the alternating voltage supply means, that is associated with the second alternating voltage, with a first contact electrically connected to the second switching contact; and a feedback means (18, 19, 20) with a third voltage input for receiving a direct reference voltage related to the second voltage input, with an inductive connection element electrically connecting the third voltage input and the control contact, and with a parasitic capacitance connecting the first switching contact and the control contact; wherein the feedback means (18, 19, 20) is configured such that the semiconductor switch oscillates, so that the first alternating voltage is applied between a second contact of the first capacitive resonant element associated with the first alternating voltage and a second contact of the second capacitive resonant element associated with the first alternating voltage, and so that the second alternating voltage is applied between a second contact of the first capacitive resonant element associated with the second alternating voltage and a second contact of the second capacitive resonant element associated with the second alternating voltage.