Power inverter apparatus for coping with an abrupt change in phase of input voltage
First Claim
1. A power inverting apparatus, comprising:
- a converter means for changing a first ac voltage into dc voltage;
an inverter means for changing dc voltage provided by said converter means into a second ac voltage; and
an input voltage control means for receiving a third ac voltage from an ac voltage source and for generating the first ac voltage, the first ac voltage being clamped at zero volts when the polarity of the third ac voltage supplied by said ac voltage source is inconsistent with the polarity of the second ac voltage provided by said inverter means.
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Accused Products
Abstract
The present invention provides a power inverting apparatus capable of coping with an abrupt change in phase of input voltage within a certain range and operating in a stable manner continuously. According to a first aspect of the present invention, a power inverting apparatus comprises a converter unit for changing ac voltage supplied by an ac voltage source into dc voltage, an inverter unit for changing dc voltage supplied by converter unit into ac voltage, and an input voltage control unit that when the polarity of ac voltage supplied by the ac voltage source inconsistent with the one of ac voltage supplied by the inverter unit, cuts off ac voltage to be supplied to the converter unit.
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Citations
35 Claims
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1. A power inverting apparatus, comprising:
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a converter means for changing a first ac voltage into dc voltage; an inverter means for changing dc voltage provided by said converter means into a second ac voltage; and an input voltage control means for receiving a third ac voltage from an ac voltage source and for generating the first ac voltage, the first ac voltage being clamped at zero volts when the polarity of the third ac voltage supplied by said ac voltage source is inconsistent with the polarity of the second ac voltage provided by said inverter means. - View Dependent Claims (5, 24, 25, 26, 27)
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2. A power inverting apparatus for use with an ac voltage source, said power inverting apparatus comprising:
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a converter having first and second switching circuits connected in series with each other and having a junction between the first and second switching circuits, and an output voltage; an input voltage switching circuit having an output connected to said converter at the junction between the first and second switching circuits and having an input adapted to be connected to the ac voltage source; a selector connected in parallel with said converter, said selector having third and fourth switching circuits connected in series with each other and having a junction between the third and fourth switching circuits, the junction being adapted to be connected to the ac voltage source; an inverter connected in parallel with said converter, said inverter having fifth and sixth switching circuits connected in series with each other and said inverter having an output voltage; and a switching control circuit for turning on or off said input voltage switching circuit and said first to sixth switching circuits on the basis of an ac voltage supplied by the ac voltage source and the inverter output voltage according to a given timing. - View Dependent Claims (3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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28. A power inverting apparatus, comprising:
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a converter means for changing ac voltage supplied by an ac voltage source into dc voltage; an inverter means for changing dc voltage provided by said converter means into ac voltage; a converter voltage command generator for generating a converter voltage command; an inverter voltage command generator for generating an inverter voltage command; a carrier generator for generating first and second carriers that are 180°
out of phase mutually; anda control means for controlling said converter means and said inverter means so as to control pulse-width modulation of said converter according to the converter voltage command and the first carrier and to control pulse-width modulation of said inverter according to the inverter voltage command and a second carrier. - View Dependent Claims (29, 30, 31)
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32. A power inverting apparatus, comprising:
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a converter including a first switch made by connecting a pair of switching circuits in series with each other and having a middle point of said first switch connected to one terminal of an ac voltage source; a smoothing capacitor connected in parallel with said converter; a selector connected in parallel with said converter, including a second switch made by connecting a pair of switching circuits in series with each other, and having a middle point of said second switch connected to the other terminal of the ac voltage source; an inverter connected in parallel with said converter, and including a third switch made by connecting a pair of switching circuits in series with each other; a converter voltage command generator for generating a converter voltage command; an inverter voltage command generator for generating an inverter voltage command; and a control means for representing combinations of logical states of said first to third switches in the form of voltage vectors, for converting the converter voltage command and the inverter voltage command into voltage vector commands, for calculating a required combination of logical states and a valid time interval of the combination according to the voltage vector commands, and for generating switching signals for said switching circuits in said first to third switches. - View Dependent Claims (33, 34, 35)
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Specification