Sense current generation apparatus and method

A sense current generation apparatus comprising:

• a main electronically controlled switch comprising a first terminal and a second terminal, said main electronically controlled switch arranged to provide a current path for an input current;
• a sense electronically controlled switch comprising a first terminal and a second terminal, said sense electronically controlled switch arranged to generate a sense current therethrough;
• a voltage matching circuit in communication with said first terminal of said main electronically controlled switch and said first terminal of said sense electronically controlled switch, said voltage matching circuit arranged to adjust the voltage across said first and second terminals of said sense electronically controlled switch to equal the voltage across said first and second terminals of said main electronically controlled switch, within a predetermined maximum error voltage, such that said generated sense current is representative of the input current;
• and
• a voltage governor arranged to:
• receive an indication of the value of the voltage across said first and second terminals of said main electronically controlled switch;
• and
• responsive to said received voltage value indication, adjust the gate voltage of said main electronically controlled switch such that the absolute value of the voltage between the first terminal and the second terminal of said main electronically controlled switch is maintained above a predetermined voltage threshold, said predetermined voltage threshold greater than said predetermined maximum error voltage.