Patent ID: 8729915

Claim:
Current monitor for sensing the current in a current path, said current monitor comprising a resistive sensing element in a section of said current path and a current mirror circuit comprising: a first semiconductor device and a second semiconductor device, both semiconductor devices electrically interconnected with each other for copying the current in the second semiconductor device to the first semiconductor device, wherein the first semiconductor device is electrically connected to an electric reference potential and to a current input side of the section via a resistive equivalence element in a first current branch, and wherein the second semiconductor device is electrically connected to the electric reference potential via a resistive output element being electrically arranged in a first current branch between the first semiconductor device and the reference potential, and the first semiconductor device is electrically connected to a current output side of the section in a second current branch; and a constant current source for keeping the current in the second current branch independent from the potential difference between the potential of the current output side of the section and the reference potential, the constant current source comprising a current mirror assembly supplied by a voltage supply.