Inverter ripple regulator

Abstract

A sinusoidal-like output is obtained from a source of DC by adding the outputs of two or more DC to AC inverters, producing flat-topped pules combining to provide a normally near ideal stepped sinusoidal-like waveform, with the output of a buck-boost circuit which produces bucking or boosting outputs of one polarity or another when voltage regulation is called for or a zero output when no regulation is called for. The operation of the buck-boost circuit preferably is controlled by a circuit which responds to the combinations of polarities of voltages obtained at two signal tap-off points of a bridge circuit including first and second input terminals between which terminals and a common terminal are connected in opposite phase a low power, low amplitude ideal sinusoidal reference signal and a proportionate part of the filtered combined outputs of the inverter and buck-boost circuits, the magnitude of the combined signal output at said second terminal being selected to normally match that of said reference signal at said second output terminal. A series circuit of a number of impedance means are connected between said signal input terminals, and said tap-off points are made at points along said series circuit of impedance means which are symmetrically related with respect to an intermediate impedance point therebetween which is at zero potential with respect to said common terminal when the reference signal and combined signal output at said first and second input terminals are of equal value.

Dependencies are inferred from the claim text.