Parallel DC-to-AC power inverter system with current sharing technique and method thereof
First Claim
1. A parallel DC-to-AC power inverter system having a first DC-to-AC power inverter electrically connected in parallel with a second DC-to-AC power inverter, each of said DC-to-AC power inverters comprising:
- an input port;
an output port;
a switching circuit electrically connected between said input port and said output port responsive to inverter control signals to convert a DC voltage at said input port to a first AC output voltage;
an inductor-capacitor filter electrically connected to said switching circuit for filtering said first AC output voltage to an AC output voltage at output port; and
a controller module for detecting an inductor current at said inductor-capacitor filter to generate an AC inductor current signal, for detecting said AC output voltage at said output terminals and transforming said AC output voltage to generate a first AC reference current signal, for detecting a load current at output port to generate an AC load current signal, for generating a second AC reference current signal by adding said first AC reference current signal to said AC load current signal, for performing a numerical operation of said second AC reference current signal of said first DC-to-AC power inverter and said second AC reference current signal of said second DC-to-AC power inverter to generate an AC reference current signal, and for generating said inverter control signals responsive to said AC reference current signal and said AC inductor current signal by sensing said inductor current at said inductor-capacitor filter.
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Accused Products
Abstract
A parallel DC-to-AC power inverter system is provided. The parallel DC-to-AC power inverter system has a first DC-to-AC power inverter electrically connected in parallel with a second DC-to-AC power inverter, and each of the DC-to-AC power inverters includes an input port, an output port, a switching circuit electrically connected between the input port and the output port responsive to inverter control signals to convert a DC voltage at the input port to a first AC output voltage, an inductor-capacitor filter electrically connected to the switching circuit for filtering the first AC output voltage to an AC output voltage at output port, and a controller module for detecting an inductor current at the inductor-capacitor filter to generate an AC inductor current signal, for detecting the AC output voltage at the output terminals and transforming the AC output voltage to generate a first AC reference current signal, for detecting a load current at output port to generate an AC load current signal, for generating a second AC reference current signal by adding the first AC reference current signal to the AC load current signal, for performing a numerical operation of the second AC reference current signal of the first DC-to-AC power inverter and the second AC reference current signal of the second DC-to-AC power inverter to generate an AC reference current signal, and for generating the inverter control signals responsive to the AC reference current signal and the AC inductor current signal by sensing the inductor current at the inductor-capacitor filter. The related methods are also discussed.
5 Citations
13 Claims
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1. A parallel DC-to-AC power inverter system having a first DC-to-AC power inverter electrically connected in parallel with a second DC-to-AC power inverter, each of said DC-to-AC power inverters comprising:
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an input port;
an output port;
a switching circuit electrically connected between said input port and said output port responsive to inverter control signals to convert a DC voltage at said input port to a first AC output voltage;
an inductor-capacitor filter electrically connected to said switching circuit for filtering said first AC output voltage to an AC output voltage at output port; and
a controller module for detecting an inductor current at said inductor-capacitor filter to generate an AC inductor current signal, for detecting said AC output voltage at said output terminals and transforming said AC output voltage to generate a first AC reference current signal, for detecting a load current at output port to generate an AC load current signal, for generating a second AC reference current signal by adding said first AC reference current signal to said AC load current signal, for performing a numerical operation of said second AC reference current signal of said first DC-to-AC power inverter and said second AC reference current signal of said second DC-to-AC power inverter to generate an AC reference current signal, and for generating said inverter control signals responsive to said AC reference current signal and said AC inductor current signal by sensing said inductor current at said inductor-capacitor filter. - View Dependent Claims (2, 3, 4)
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5. A parallel DC-to-AC power inverter system having a first DC-to-AC power inverter electrically connected in parallel with a second DC-to-AC power inverter, each of said DC-to-AC power inverters comprising:
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an input port;
an output port;
a switching circuit electrically connected between said input port and said output port responsive to inverter control signals to convert a DC voltage at said input port to a first AC output voltage;
an inductor-capacitor filter electrically connected to said switching circuit for filtering said first AC output voltage to an AC output voltage at output port; and
a controller module for detecting an inductor current at said inductor-capacitor filter to generate an AC inductor current signal, for detecting said AC output voltage at said output port and transforming said AC output voltage to generate a first AC reference current signal, for performing a numerical operation of said first AC reference current signal of said first DC-to-AC power inverter and said first AC reference current signal of said second DC-to-AC power inverter to generate an AC reference current signal, and for generating said inverter control signals responsive to said AC reference current signal and said AC inductor current signal by sensing said inductor current at said inductor-capacitor filter. - View Dependent Claims (6, 7, 8)
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9. A control method for the parallel DC-to-AC power inverter system having a first DC-to-AC power inverter electrically connected in parallel with a second DC-to-AC power inverter, wherein each of said DC-to-AC power inverter comprises an input port, an output port, a switching circuit electrically connected between said input port and said output port responsive to inverter control signals to convert a DC voltage at said input port to a first AC output voltage, an inductor-capacitor filter electrically connected to said switching circuit for filtering said first AC output voltage to a AC output voltage at output port, comprising the steps of:
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detecting an inductor current at said inductor-capacitor filter to generate an AC inductor current signal;
detecting said AC output voltage at said output terminals and transforming said AC output voltage to generate a first AC reference current signal;
detecting a load current at output port to generate an AC load current signal;
generating a second AC reference current signal by adding said first AC reference current signal to said AC load current signal;
performing a numerical operation of said second AC reference current signal of said first DC-to-AC power inverter and said second AC reference current signal of said second DC-to-AC power inverter to generate an AC reference current signal; and
generating said inverter control signals responsive to said AC reference current signal and said AC inductor current signal by sensing said inductor current at said inductor-capacitor filter. - View Dependent Claims (11, 13)
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12. A control method for the parallel DC-to-AC power inverter system having a first DC-to-AC power inverter electrically connected in parallel with a second DC-to-AC power inverter, wherein each of said DC-to-AC power inverter comprises an input port, an output port, a switching circuit electrically connected between said input port and said output port responsive to inverter control signals to convert a DC voltage at said input port to a first AC output voltage, an inductor-capacitor filter electrically connected to said switching circuit for filtering said first AC output voltage to a AC output voltage at output port, comprising the steps of:
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detecting an inductor current at said inductor-capacitor filter to generate an AC inductor current signal;
detecting said AC output voltage at said output port and transforming said AC output voltage to generate a first AC reference current signal;
performing a numerical operation of said first AC reference current signal of said first DC-to-AC power inverter and said first AC reference current signal of said second DC-to-AC power inverter to generate an AC reference current signal; and
generating said inverter control signals responsive to said AC reference current signal and said AC inductor current signal by sensing said inductor current at said inductor-capacitor filter.
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Specification