DC power-supply device and refrigeration-cycle application device including the same
First Claim
1. A DC power-supply device that converts a three-phase alternating current into a direct current and supplies the direct current to a load, the DC power-supply device having a reactor on a converting path comprising:
- a first capacitor and a second capacitor serially connected between output terminals to the load;
a charging unit that selectively charges one or both of the first capacitor and the second capacitor; and
a control unit that controls the charging unit to selectively charge one or both of the first capacitor and the second capacitor at a charging frequency, whereinthe control unit controls the charging unit in such a manner that, when a period combining a charging period and a non-charging period of the first capacitor and the second capacitor is designated as one cycle, the charging frequency, which is an inverse number of the one cycle, becomes 3n times (n is a natural number) a frequency of the three-phase alternating current.
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Accused Products
Abstract
A DC power-supply device that suppresses an increase of a harmonic current and deterioration of a power factor without causing any imbalance among respective phase currents, in a configuration in which a three-phase alternating current is converted into a direct current and supplied to a load. The DC power-supply device includes a rectifier circuit, a reactor connected to an input side or an output side of the rectifier circuit, a first capacitor and a second capacitor serially connected between output terminals to a load, and a charging unit. During a cycle combining a charging period and a non-charging period of a pair of the first capacitor and the second capacitor, the charging unit is controlled so that a charging frequency becomes 3n times (n is a natural number) the frequency of the three-phase alternating current.
20 Citations
20 Claims
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1. A DC power-supply device that converts a three-phase alternating current into a direct current and supplies the direct current to a load, the DC power-supply device having a reactor on a converting path comprising:
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a first capacitor and a second capacitor serially connected between output terminals to the load; a charging unit that selectively charges one or both of the first capacitor and the second capacitor; and a control unit that controls the charging unit to selectively charge one or both of the first capacitor and the second capacitor at a charging frequency, wherein the control unit controls the charging unit in such a manner that, when a period combining a charging period and a non-charging period of the first capacitor and the second capacitor is designated as one cycle, the charging frequency, which is an inverse number of the one cycle, becomes 3n times (n is a natural number) a frequency of the three-phase alternating current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification
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- Resources
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Current AssigneeMitsubishi Electric Corporation
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Original AssigneeMitsubishi Electric Corporation
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InventorsKamiya, Shota, Hatakeyama, Kazunori, Ito, Norikazu, Isoda, Shoji, Yuasa, Kenta
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Primary Examiner(s)Chan, Kawing
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Application NumberUS14/787,527Publication NumberTime in Patent Office1,463 DaysField of Search3184003, 31840001, 318700, 363 44US Class CurrentCPC Class CodesH02M 1/12 Arrangements for reducing h...H02M 1/4216 operating from a three-phas...H02M 3/158 including plural semiconduc...H02M 7/06 using discharge tubes witho...H02M 7/217 using semiconductor devices...H02P 6/14 Electronic commutatorsH02P 6/28 Arrangements for controllin...Y02B 70/10 Technologies improving the ...
