DIRECT AC POWER CONVERTING APPARATUS
First Claim
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1. A direct AC power converting apparatus, comprising:
- a plurality of input lines to which an output of a multi-phase AC power supply including a neutral point is applied;
a positive-side DC power supply line;
a negative-side DC power supply line to which a potential lower than a potential applied to said positive-side DC power supply line is applied;
a current-source power converter including a plurality of switch devices, converting a multi-phase AC voltage applied between ones of said plurality of input lines into a square-wave-shape DC voltage having two potentials by selection operations of said plurality of switch devices, and supplying said DC voltage between said positive-side DC power supply line and said negative-side DC power supply line;
a plurality of input capacitors each provided between the ones of said plurality of input lines and functioning as a voltage source;
a first diode provided between said positive-side DC power supply line and said negative-side DC power supply line and having an anode on said positive-side DC power supply line and a cathode on said negative-side DC power supply line side;
first and second capacitors connected, between said positive-side DC power supply line and said negative-side DC power supply line, in series with said first diode;
a neutral phase input line connecting said neutral point and a point between said first capacitor and said second capacitor;
a voltage-source power converter converting said DC voltage into a square-wave-shape AC voltage and outputting to an inductive multi-phase load;
a resistor inserted in any one of said plurality of input lines and said neutral phase input line; and
a control section controlling the selection operations of said plurality of switch devices, performing voltage doubler rectification on a phase voltage for one phase which is applied between one of said plurality of input lines and said neutral phase input line, and supplying for charging of said first capacitor and said second capacitor through said resistor.
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Abstract
A control section controls a current-source converter in a state in which a switch is in conduction, and performs voltage doubler rectification on a voltage between a neutral phase input line and any of input lines to provide for charging of clamp capacitors. Accordingly, the clamp capacitors are charged through a resistor, which prevents an inrush current from flowing therethrough. In addition, a voltage between both ends of a pair of the clamp capacitors is higher than, for example, a voltage between both ends of a pair of capacitors. Accordingly, even if the clamp capacitors and, for example, the capacitors are electrically connected to each other in a normal operation, it is possible to prevent the inrush current from flowing from the capacitors to the clamp capacitors.
27 Citations
13 Claims
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1. A direct AC power converting apparatus, comprising:
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a plurality of input lines to which an output of a multi-phase AC power supply including a neutral point is applied; a positive-side DC power supply line; a negative-side DC power supply line to which a potential lower than a potential applied to said positive-side DC power supply line is applied; a current-source power converter including a plurality of switch devices, converting a multi-phase AC voltage applied between ones of said plurality of input lines into a square-wave-shape DC voltage having two potentials by selection operations of said plurality of switch devices, and supplying said DC voltage between said positive-side DC power supply line and said negative-side DC power supply line; a plurality of input capacitors each provided between the ones of said plurality of input lines and functioning as a voltage source; a first diode provided between said positive-side DC power supply line and said negative-side DC power supply line and having an anode on said positive-side DC power supply line and a cathode on said negative-side DC power supply line side; first and second capacitors connected, between said positive-side DC power supply line and said negative-side DC power supply line, in series with said first diode; a neutral phase input line connecting said neutral point and a point between said first capacitor and said second capacitor; a voltage-source power converter converting said DC voltage into a square-wave-shape AC voltage and outputting to an inductive multi-phase load; a resistor inserted in any one of said plurality of input lines and said neutral phase input line; and a control section controlling the selection operations of said plurality of switch devices, performing voltage doubler rectification on a phase voltage for one phase which is applied between one of said plurality of input lines and said neutral phase input line, and supplying for charging of said first capacitor and said second capacitor through said resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification
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Current AssigneeDaikin Industries Ltd
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Original AssigneeDaikin Industries Ltd
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InventorsSakakibara, Kenichi
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current363/37
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CPC Class CodesH02M 1/36 Means for starting or stopp...H02M 5/4585 having a rectifier with con...H02M 7/219 in a bridge configurationH02P 2207/05 Synchronous machines, e.g. ...H02P 27/06 using dc to ac converters o...
