AC-DC power supply

An AC-DC converter for at least one battery or electrolyze cell comprising:

• an AC side input port;
• a first DC connection and a second DC connection defining a DC side output port connectable to a load in the form of at least one battery or electrolyze cell;
• an AC-DC rectifier having an AC rectifier side connected to the AC side input port and a DC rectifier side comprising a first DC rectifier connection and a second DC rectifier connection, wherein the first DC rectifier connection is connected to the first DC connection;
• and
• an AC-AC converter connected in series with the load and having a first AC input and a second AC input, wherein the first AC input is connected to the second DC connection, and a first AC output and a second AC output, wherein the first AC output and the second AC output are connected to the AC side input port.

A method of supplying power to a load by an AC-DC converter, the method comprising the steps of:

• providing an AC-DC converter having an AC side input port;
• a DC side output port;
• an AC-DC rectifier;
• and a DC-AC converter or an AC-AC converter;
• connecting the AC side input port to a grid;
• connecting the AC-DC rectifier to the load;
• connecting the DC-AC converter or AC-AC converter serially with the load;
• and
• connecting an output of the DC-AC converter or AC-AC converter to the grid, wherein:
• a voltage is divided between the DC-AC converter or the AC-AC converter and the load, and
• the DC-AC converter or the AC-AC converter feeds real power and reactive power back to the grid connected to the AC side input port to achieve power factor correction.