Systems and methods for supplying power and high precision voltage measurement

A power supply system comprising:

• a loading circuit comprising power electronics configured to, at least, apply DC electrical power to a load, the power electronics comprising a plurality of amplifiers, the plurality of amplifiers comprising at least a first amplifier and a second amplifier, the second amplifier having a greater maximum output current than the first amplifier;
• a power supply unit coupled to drive the loading circuit, the power supply unit comprising a converter configured to, at least, convert input AC electrical power to DC electrical power;
• and
• a controller configured to at least:
• generate a voltage control signal and a current control signal to be received as input by the loading circuit, the voltage control signal and current control signal representing voltage and current values respectively to be applied to the load,
• determine a voltage level to be supplied by the power supply unit to the loading circuit, and
• provide a power supply voltage control signal to the power supply unit, the power supply voltage control signal representing the voltage level to be supplied by the power supply unit to the loading circuit;
• a first relay operable to, at least, couple an output of the first amplifier to the load;
• and
• a second relay operable to, at least, couple an output of the second amplifier to the load;
• wherein the controller is configured to, at least, activate the first relay, the second relay or both based on a maximum current that is to pass through the load, the maximum current being less than the maximum output current of the amplifier corresponding to the activated relay.