Patent ID: 7952896
Filing Date: 2011-05-31
Classification: H02M

Abstract:
1. A controller for reducing common mode voltage in a power conversion system having a plurality of inputs and a plurality of outputs, the controller comprising: a plurality of control signals connected to switching devices within the power conversion system, wherein the switching devices are responsive to the control signals to selectively connect each output of the power conversion system to one of the plurality of inputs of the power conversion system; a reference signal generator that generates reference signals representing a desired value for each of the plurality of outputs of the power conversion system; a comparator circuit for converting the reference signals to square wave representations of the reference signals; and a gating signal distributor having a plurality of logic circuits configured to generate the control signals to be supplied to the switching devices based on the square wave representations of the reference signals, and configured to impose a constraint on the control signals that is defined by assigning an integer value to each input of the power conversion system and requiring that selective connection of the outputs of the power conversion system to the inputs results in a sum of the integer values being equal to zero at any given time.