Voltage doubling variable frequency drive

A voltage doubling converter for a three phase variable drive, comprising:

• a three phase power input having a three phase power input voltage;
• an active full bridge rectifier circuit having a set of switching transistors operably coupled to the three phase power input having a DC power output;
• an adaptive hysteresis current control unit coupled to the active full bridge rectifier circuit;
• an inverter coupled to the DC power output;
• a three phase power output having a three phase power output voltage;
• wherein the three phase power output voltage is greater than the three phase power input voltage;
• and
• wherein the adaptive hysteresis current control unit is constructed to:
• measure the three phase power input to determine respective phase voltages for V12 corresponding to a first phase, V23 corresponding to a second phase and V13 corresponding to a third phase;
• define three phase sectors wherein for each sector, two of V12, V23 and V13 are the same polarity, and the other is the opposite polarity;
• set the state of the set of switches according to which three phase sector the three-phase power input is in;
• and
• wherein the three phase sectors are used to set the state of the switching transistors in order to maintain a constant average switching frequency.