Device and method for measuring leakage current

A method for measuring an alternating (AC) leakage current through a conductor, such as a ground conductor, whereby said method comprises the step of providing a device comprising:

• a conversion circuit comprising a magnetic core, and
• a leakage current measurement circuit,
• wherein the method comprises the steps of:
• providing a synchronous rectification circuit that comprises a plurality of metal oxide semiconductor field effect transistors (MOSFETs),
• passing said conductor through said magnetic core or winding said conductor around said magnetic core, whereby said conductor constitutes a primary winding of the conversion circuit,
• providing said conversion circuit with a plurality of pairs of secondary windings or a single secondary winding with a plurality of taps, whereby said plurality of pairs of secondary windings or said single secondary winding is are wound around said magnetic core, whereby said conversion circuit is configured to convert a primary AC current in said at least one primary winding to a secondary AC current in said plurality of pairs of secondary windings or said single secondary winding, and
• configuring at least one first pair of secondary windings or at least one first pair of taps to apply a voltage to said plurality of MOSFETs, and
• connecting at least one second pair of secondary windings or at least one second pair of taps to said synchronous rectification circuit, and
• configuring said synchronous rectification circuit to rectify said secondary AC current in said at least one second pair of secondary windings or said single secondary winding to a direct current (DC) and supplying said DC current to said leakage current measurement circuit.