Patent ID: 7511979
Filing Date: 2009-03-31
Classification: H02M

Abstract:
1. An electronic control system for controlling the operation of a three phase power converter having a nominal rated output voltage, the converter having an input connectable to a source of single phase power and an output, the output connectable to an electrical load having a variable impedance, the control system comprising: a switching device capable of connecting the input of the converter to the source of single phase power, wherein the conductivity of the switching device is controlled by a control signal; an impedance detector circuit coupled to the output of the power converter, the impedance detector circuit responsive to the value of the variable impedance of the electrical load and providing a first signal indicative of a change in the variable impedance with respect to a first pre-selected value, the first signal defining the control signal for control of the switching device, the first signal enabling the switching device to be in a conductive state; a first load current detector circuit coupled to the output of the power converter, the first load current detector circuit responsive to the amount of current provided by the output of the converter to the electrical load and providing a second signal indicative of a change in the output current with respect to a second pre-selected value.