Method for fault detection of an electrical circuit, and an electrical circuit

A method for fault detection of an electrical circuit, comprising:

• providing the electrical circuit including a first inductive interface, a first branch including two parallel and counter-currently connected diodes, a second branch, and a voltage-limiting impedance, wherein the voltage-limiting impedance includes a breakthrough range, and wherein the first and the second branches are connected in parallel and are connected to the first inductive interface;
• applying an alternating voltage or an alternating current across the first inductive interface via a second inductive interface, wherein the applied voltage or current is high enough that the voltage-limiting impedance reaches the breakthrough range;
• measuring the impedance across the first inductive interface via the second inductive interface;
• and
• determining whether a fault of the voltage-limiting impedance is present based upon the measured impedance.

An electrical circuit, comprising:

• a first side including a first inductive interface and a first branch and a second branch, the first branch including two parallel and counter-currently connected diodes, wherein the first branch and the second branch are connected in parallel and are connected to the first inductive interface;
• and
• a second side, including a second inductive interface and an impedance-measuring unit connected thereto, wherein the impedance-measuring unit is configured to apply an alternating voltage or an alternating current across the second inductive interface,
• wherein the applied voltage or current is small enough that when the second inductive interface is connected to the first inductive interface essentially no current flows through the two diodes,
• wherein the impedance-measuring unit is configured to measure the impedance across the first inductive interface and to determine whether a fault is present in the second branch of the first side based upon the measured impedance.