Patent ID: 7315151

Claim:
A single stage AC to AC power controller for controlling an AC input voltage to a load, the input voltage having one or more phases, the controller comprising: a circuit comprising eight independently controllable switches, one such circuit for each input line to be regulated, the switches of the circuit arranged in a conventional power regulator topology, whereby a selected regulator topology may be implemented, depending upon the position of the switches and to the input voltage; the controller further comprising logic control having a polarity detector in parallel with the input voltage, the polarity detector having two outputs; and a duty cycle modulator having two outputs, wherein one output from the polarity detector is inverted with respect to the output of the polarity detector; wherein one output from the duty cycle modulator is inverted with respect to the output of the duty cycle modulator; and wherein there is always an electrically conducting path through the switches wherein there is at least one switch conducting.