A power converter, comprising: a transformer (Tr) with a primary and a secondary; a capacitor (Cr) and an inductor (Lr) serially connected with the primary of the transformer (Tr), wherein the capacitor (Cr), the inductor (Lr) and a magnetizing inductor (Lm) of the primary of the transformer (Tr) form an Inductor-Inductor-Capacitor, LLC, resonant circuit; a first current sensor comprising the inductor (Lr) and configured to sense, via the inductor (Lr), a current passing through the primary of the transformer (Tr); and a second current sensor comprising the primary and configured to sense, via the primary, a current passing through the magnetizing inductor (Lm) of the transformer (Tr), the power converter being characterised by a first integrator (310, 410, 510) configured to integrate the sensed current passing through the primary of the transformer (Tr) to obtain a first integrated current signal (I_Lr); a second integrator (320, 420, 520) configured to integrate the sensed current passing through the magnetizing inductor (Lm) of the transformer (Tr) to obtain a second integrated current signal (I_Lm); and a difference determining element configured to determine a difference between the first integrated current signal (I_Lr) and the second integrated current signal (I_Lm); so that a signal characterizing a current passing through the secondary of the transformer (Tr) can be obtained based on the determined difference; wherein a signal characterizing a current passing through the secondary is determined from the difference between the first integrated current signal (I_Lr) and the second integrated current signal (I_Lm). a transformer (Tr) with a primary and a secondary; a capacitor (Cr) and an inductor (Lr) serially connected with the primary of the transformer (Tr), wherein the capacitor (Cr), the inductor (Lr) and a magnetizing inductor (Lm) of the primary of the transformer (Tr) form an Inductor-Inductor-Capacitor, LLC, resonant circuit; a first current sensor comprising the inductor (Lr) and configured to sense, via the inductor (Lr), a current passing through the primary of the transformer (Tr); and a second current sensor comprising the primary and configured to sense, via the primary, a current passing through the magnetizing inductor (Lm) of the transformer (Tr), the power converter being characterised by a first integrator (310, 410, 510) configured to integrate the sensed current passing through the primary of the transformer (Tr) to obtain a first integrated current signal (I_Lr); a second integrator (320, 420, 520) configured to integrate the sensed current passing through the magnetizing inductor (Lm) of the transformer (Tr) to obtain a second integrated current signal (I_Lm); and a difference determining element configured to determine a difference between the first integrated current signal (I_Lr) and the second integrated current signal (I_Lm); so that a signal characterizing a current passing through the secondary of the transformer (Tr) can be obtained based on the determined difference; wherein a signal characterizing a current passing through the secondary is determined from the difference between the first integrated current signal (I_Lr) and the second integrated current signal (I_Lm).