Power converter for receiving an input current at an input voltage and for providing an output current at an output voltage. The power converter comprises a transformer (133) having a primary (136) and at least one secondary (138) side, wherein the transformer shows a mutual inductivity L.sub.s. The power converter further comprises at least one switching device (124a, 124b) being operated at an operating frequency f.sub.op at the primary side of said transformer, and a capacitor C.sub.S at the primary side of the transformer. The capacitor forms a resonant circuit with the leakage inductivity L.sub.S of said transformer, wherein said operating frequency, said capacitor C.sub.s, said mutual inductivity L.sub.m and said leakage inductivity L.sub.S are matched such that the effective value of the output current is substantially constant with respect to variations of a load being traversed by said output current by using resonance principles and operating the power converter in a current source mode.