Power supply and method of supplying power to load

A power supply comprising:

• an inverter configured to convert direct current (DC) power into alternating current (AC) power,
• wherein the inverter comprises two output nodes such that the AC power is supplied to a load via the two output nodes, and
• wherein the inverter further comprises an inductor which is electrically connected between the two output nodes;
• and
• a controller configured to:
• periodically determine a next cell to be a powering cell or a freewheeling cell,
• adjust a total length of a freewheeling period in the freewheeling cell for controlling the power supplied to the load, and
• control the inverter according to the determined cell configuration,
• wherein the powering cell consists of only powering period,
• wherein the freewheeling cell comprises a powering period and a freewheeling period, at least one of a positive voltage and a negative voltage being output during the powering period and both of a positive voltage and a negative voltage being not output during the freewheeling period, and
• wherein the freewheeling cell is configured that i) absolute value of a positive peak of a current of the inductor is to be matched to an absolute value of a negative peak of the current of the inductor, and ii) a total length for the positive voltage in the freewheeling cell is to be identical to a total length for the negative voltage in the freewheeling cell such that a damage to the at least one first switch and the at least one second switch can be minimized while adjusting the power supplied to the load using the freewheeling cell.