A multi-cell power supply (100a, 100b, 160a, 160b, 160c, 260) for receiving power from a source and delivering power at a power output terminal to a load, the multi-cell power supply (100a, 100b, 160a, 160b, 160c, 260) comprising: a first power cell (16b1) 16a3) with a rectifier at an input, an inverter at a cell output terminal, and a dc bus capacitor coupling the rectifier with the inverter, the first power cell (16al - 16a3)being coupled to the source and providing a first output current, the first power cell (16al - 16a3)comprising a first output terminal coupled to a reference node of the multi-cell power supply (100a, 100b, 160a, 160b, 160c, 260), and a second output terminal coupled to the cell output terminal; a second power cell (16b1-16b3, 16c1-16c3) having an output phase that is different from the output phase of the first power cell, being coupled to the source and providing a second output current, the second power cell comprising a first output terminal coupled to the reference node of the multi-cell power supply, and a second output terminal coupled to the cell output terminal, a first current sensor circuit comprising: a first current sensor (20b1) coupled to the first output terminal of the first power cell (16al - 16a3, 16b1 - 16b3, 16c1 - 16c3), wherein the first current sensor measures the first output current, characterized by a power supply including a first input coupled to the input of the power cell and a second input coupled to the reference node wherein the power supply of the first current sensor circuit provides power to the first current sensor; wherein the first current sensor circuit further comprises a second current sensor (20c1) coupled to the first output terminal of the second power cell (16c1), wherein the second current sensor measures the second output current. a first power cell (16b1) 16a3) with a rectifier at an input, an inverter at a cell output terminal, and a dc bus capacitor coupling the rectifier with the inverter, the first power cell (16al - 16a3)being coupled to the source and providing a first output current, the first power cell (16al - 16a3)comprising a first output terminal coupled to a reference node of the multi-cell power supply (100a, 100b, 160a, 160b, 160c, 260), and a second output terminal coupled to the cell output terminal; a second power cell (16b1-16b3, 16c1-16c3) having an output phase that is different from the output phase of the first power cell, being coupled to the source and providing a second output current, the second power cell comprising a first output terminal coupled to the reference node of the multi-cell power supply, and a second output terminal coupled to the cell output terminal, a first current sensor circuit comprising: a first current sensor (20b1) coupled to the first output terminal of the first power cell (16al - 16a3, 16b1 - 16b3, 16c1 - 16c3), wherein the first current sensor measures the first output current, characterized by a power supply including a first input coupled to the input of the power cell and a second input coupled to the reference node wherein the power supply of the first current sensor circuit provides power to the first current sensor; a first current sensor (20b1) coupled to the first output terminal of the first power cell (16al - 16a3, 16b1 - 16b3, 16c1 - 16c3), wherein the first current sensor measures the first output current, characterized by a power supply including a first input coupled to the input of the power cell and a second input coupled to the reference node wherein the power supply of the first current sensor circuit provides power to the first current sensor; wherein the first current sensor circuit further comprises a second current sensor (20c1) coupled to the first output terminal of the second power cell (16c1), wherein the second current sensor measures the second output current.