Voltage balancing circuit
First Claim
1. A voltage balancing circuit for balancing first through Nth phase voltages produced on first through Nth output lines where N is an integer greater than one, comprising:
- first through Nth means coupled to the first through Nth output lines, respectively, for sensing the magnitude of the first through Nth phase voltages; and
N-1 voltage combining circuits responsive to the first through Nth sensing means and coupled to N-1 output lines for modifying the voltage magnitude on the N-1 output lines whereby the first through nth phase voltages are maintained within a range of voltage magnitudes.
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Abstract
Prior voltage balancers for three-phase inverters are useful only with inverters which are not in wide use today. In order to overcome this problem, a voltage balancing circuit for a commonly used inverter balances N phase voltages produced on N output lines. The circuit includes switch controllers coupled to the N output lines for sensing the magnitude of each phase voltage and N-1 voltage combining circuits responsive to the switch controllers and coupled to N-1 output lines for modifying the voltage magnitudes on the N-1 output lines whereby the N phase voltages are maintained within a range of voltage magnitudes.
22 Citations
7 Claims
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1. A voltage balancing circuit for balancing first through Nth phase voltages produced on first through Nth output lines where N is an integer greater than one, comprising:
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first through Nth means coupled to the first through Nth output lines, respectively, for sensing the magnitude of the first through Nth phase voltages; and N-1 voltage combining circuits responsive to the first through Nth sensing means and coupled to N-1 output lines for modifying the voltage magnitude on the N-1 output lines whereby the first through nth phase voltages are maintained within a range of voltage magnitudes. - View Dependent Claims (2, 3, 4)
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5. A voltage balancing circuit for balancing three-phase voltages produced by an inverter on first, second and third output lines wherein the inverter receives DC power on DC link conductors from a brushless generator which develops variable-frequency voltages and an AC/DC converter coupled to the brushless generator, comprising:
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first and second switch controllers coupled to the first and second output lines, respectively; a voltage regulator coupled to at least one of the output lines for regulating the voltages produced across the DC link conductors to in turn control an average magnitude of the three-phase voltages; first and second inverters coupled to the first and second switch controllers and the DC link conductors; and first and second transformers coupled between the first and second inverts and two of the output lines, whereby the switch controllers operate the inverters to produce supplemental AC power which is combined by the transformers with two of the phase voltages so that the magnitudes of the three phase voltages are maintained at substantially equal levels. - View Dependent Claims (6, 7)
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Specification