Inverter ripple regulator
First Claim
1. A converter circuit for providing a regulated sinusoidal-like output voltage under varying load current conditions from DC, said converter circuit comprising, in combination:
- DC voltage source means;
a source of a reference signal having the desired sinusoidal-like waveform;
inverter circuit means energized by said DC voltage source means for providing an output which at least roughly approximates a desired sinusoidal-like output, a buck-boost circuit having a first output condition where the output thereof is a first finite signal of one polarity which is a fraction of the maximum amplitude of said output, a second output condition where the output thereof is a second finite signal of the same amplitude but opposite polarity to said first finite signal, and a third output condition where the output thereof is zero;
means for adding the output of said buck-boost circuit to the output of said inverter circuit means to produce an overall combined output;
comparator means for comparing the output of said reference signal source and at least a part of said overall combined output of said inverter circuit and buck-boost circuits which has an amplitude comparable to said reference signal; and
control means responsive repeatedly over each half cycle to said comparator means for operating said buck-boost circuit into one of said output conditions for a desired period which brings said overall resultant output toward the instantaneous level of the desired sinusoidal output.
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Accused Products
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.
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Citations
17 Claims
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1. A converter circuit for providing a regulated sinusoidal-like output voltage under varying load current conditions from DC, said converter circuit comprising, in combination:
- DC voltage source means;
a source of a reference signal having the desired sinusoidal-like waveform;
inverter circuit means energized by said DC voltage source means for providing an output which at least roughly approximates a desired sinusoidal-like output, a buck-boost circuit having a first output condition where the output thereof is a first finite signal of one polarity which is a fraction of the maximum amplitude of said output, a second output condition where the output thereof is a second finite signal of the same amplitude but opposite polarity to said first finite signal, and a third output condition where the output thereof is zero;
means for adding the output of said buck-boost circuit to the output of said inverter circuit means to produce an overall combined output;
comparator means for comparing the output of said reference signal source and at least a part of said overall combined output of said inverter circuit and buck-boost circuits which has an amplitude comparable to said reference signal; and
control means responsive repeatedly over each half cycle to said comparator means for operating said buck-boost circuit into one of said output conditions for a desired period which brings said overall resultant output toward the instantaneous level of the desired sinusoidal output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- DC voltage source means;
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17. A converter circuit for providing a regulated sinusoidal-like output voltage under varying load current conditions from DC, said converter circuit comprising, in combination:
- DC voltage source means capable of delivering a given level of electric power, a source of a reference signal having the desired sinusoidal-like waveform, stepped sinusoidal waveform generating means for providing a stepped waveform output which approaches said desired sinusoidal-like waveform, a buck-boost circuit having a first output condition where the output thereof is a first finite signal of one polarity which is a small fraction of the maximum amplitude of said output, a second output condition where the output thereof is a second finite signal of the same amplitude but opposite polarity to said first finite signal, and a third output condition where the output thereof is zero, means for adding the output of said buck-boost circuit to the output of said stepped sinusoidal waveform generating means to produce an overall combined output, comparator means for comparing said reference signal and at least a part of said overall combined output of said stepped sinusoidal waveform generating means and buck-boost circuit having an amplitude comparable to said reference signal, and control means responsive to said comparator means for operating said buck-boost circuit into one of said output conditions for a desired period which brings said overall resultant output toward the instantaneous level of the desired sinusoidal-like output.
Specification