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公开(公告)号：US11005404B2
公开(公告)日：2021-05-11
申请号：US16329581
申请日：2016-10-31
IPC分类号： H02P25/18 , H02P27/04 , H02P6/28 , H02P29/024
摘要： In a motor driving apparatus having an inverter for driving a motor capable of switching between a star connection and a delta connection, when currents detected by winding current detecting elements detecting currents flowing through windings become excessive, the inverter is made to stop. Moreover, inverter output currents are calculated after removing a circulating current component at the time of the delta connection, from the winding currents detected by the winding current detecting elements, and the inverter is controlled using the calculated inverter output currents. Because over-current protection is performed based on the detected values of the winding currents, it is possible to prevent demagnetization taking account oSf the circulating current. Also, the inverter control is prevented from being affected by the circulating current in the delta connection. Accordingly, it is possible to reduce the number of the current detecting elements, and perform the over-current protection and control properly.
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公开(公告)号：US11804787B2
公开(公告)日：2023-10-31
申请号：US17273906
申请日：2018-09-28
CPC分类号： H02M7/219 , F24F11/88 , H02M1/0009 , H02M1/0054 , H02P27/08 , H02P2201/15
摘要： A power converting apparatus includes: a reactor that includes a first terminal and a second terminal, the first terminal being connected to an alternating-current power supply; a bridge circuit that is connected to the second terminal of the reactor, includes at least one or more switching elements, and converts an alternating-current voltage output from the alternating-current power supply into a direct-current voltage; a power-supply current detecting unit that detects a current from the alternating-current power supply; and a control unit that controls ON and OFF of the switching elements depending on a current value detected by the power-supply current detecting unit, in which two or more current thresholds for controlling ON and OFF of the switching elements are included.
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公开(公告)号：US11451149B2
公开(公告)日：2022-09-20
申请号：US17045627
申请日：2018-05-29
发明人： Kenji Iwazaki , Koichi Arisawa , Takashi Yamakawa , Takuya Shimomugi , Satoru Ichiki , Ikuro Suga
摘要： A power converter is connected between a power supply source of a first direct current power and a power supply destination of a second direct current power obtained by performing power conversion on the first direct current power. The power converter includes: a switching element; a reactor; a first diode; a first capacitor; a second diode. The reactor is connected to a first end of the switching element. The first end of the switching element and a first end of the reactor are connected to a first connection point. A cathode of the first diode is connected to a second end of the reactor. The cathode of the first diode and the second end of the reactor are connected to a second connection point. The second diode includes an anode connected to the first connection point and a cathode connected to the power supply destination.
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公开(公告)号：US11368118B2
公开(公告)日：2022-06-21
申请号：US16334379
申请日：2016-10-31
摘要： A motor driving device that is a device for driving a motor including stator windings, includes: a connection switching unit that includes relays as mechanical switches connected to the stator windings and excitation coils opening or closing the relays by being energized or non-energized with excitation current and switches connection condition of the stator windings to either of first connection condition (star connection) and second connection condition (delta connection) different from the first connection condition by opening or closing the relays; and an inverter that supplies AC drive voltages to the stator windings.
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公开(公告)号：US11811330B2
公开(公告)日：2023-11-07
申请号：US17423514
申请日：2019-03-11
摘要： A converter device includes: a power conversion circuit including a reactor and a switching element, rectifying a voltage of alternating-current power supplied from an alternating-current power supply to a direct-current voltage, and boosting and outputting the direct-current voltage; a current detector detecting a current flowing in the reactor; a filter circuit filtering a first signal detected by the current detector; and a control unit generating a control signal on the basis of a carrier and a second signal generated by the filter circuit and controlling, on the basis of the control signal and with a first period, the switching element, the first period being a period of the carrier. The filter circuit cuts off a repetition frequency component in the first period and passes a repetition frequency component in a second period, the second period being longer than the first period.
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公开(公告)号：US11804786B2
公开(公告)日：2023-10-31
申请号：US17270564
申请日：2018-09-28
CPC分类号： H02M7/219 , F25B31/026 , H02M1/083 , H02M1/38 , H02M1/44 , H02P27/08 , H02M1/0058
摘要： A power converting apparatus includes: a bridge circuit that includes at least two legs each including switching elements connected in series, and converts an alternating-current voltage output from an alternating-current power supply into a direct-current voltage; a power-supply current detecting unit that detects a current from the alternating-current power supply; a zero crossing detecting unit that detects a voltage polarity of the alternating-current power supply; and a control unit that controls ON and OFF of the switching elements depending on outputs of the power-supply current detecting unit and the zero crossing detecting unit, in which a dead time that is set for switching and includes a change in the voltage polarity of the alternating-current power supply is longer than a dead time that is set for switching and does not include a change in the polarity.
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公开(公告)号：US11788738B2
公开(公告)日：2023-10-17
申请号：US17267669
申请日：2018-08-29
发明人： Takuya Shimomugi , Keisuke Mori , Koichi Arisawa , Satoru Ichiki , Keisuke Uemura , Kenji Iwazaki
CPC分类号： F24F1/22 , F24F1/24 , F24F1/16 , F24F2013/207
摘要： An outdoor unit includes a housing that includes a front panel and a back panel facing the front panel. The outdoor unit further includes a bell mouth provided on the front panel and a heat dissipator that dissipates heat generated by electric components. A windward end surface and a leeward end surface of the heat dissipator are, when viewed from above, placed in a region between a virtual surface and the back panel, the virtual surface being a virtual surface that is in contact with an end of the bell mouth on a side of the back panel and is parallel to an inner surface of the front panel.
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8.发明授权公开(公告)号：US11387768B2
公开(公告)日：2022-07-12
申请号：US17271234
申请日：2018-09-28
IPC分类号： H02P6/28 , H02P6/24 , F25B31/02 , H02P29/024
摘要： A direct-current power supply device includes a reactor, a bridge circuit that converts alternating-current voltage output from an alternating-current power supply, which is connected to the reactor, into direct-current voltage, a capacitor that smoothes the output voltage of the bridge circuit, a current detector that detects a first current flowing as an alternating current between the alternating-current power supply and the bridge circuit, a current detector that detects a second current flowing as a direct current between the bridge circuit and the capacitor, an overcurrent determination unit that determines on the basis of a detected first current value whether or not the first current is an overcurrent, and an overcurrent determination unit that determines on the basis of a detected second current value whether or not the second current is an overcurrent. The bridge circuit stops operating when a determination result of either the overcurrent determination unit or the overcurrent determination unit indicates an overcurrent.
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公开(公告)号：US11258346B2
公开(公告)日：2022-02-22
申请号：US16328306
申请日：2016-10-28
发明人： Kenji Iwazaki , Koichi Arisawa
IPC分类号： H02M1/12 , H02M1/088 , H02M7/5387 , H02J3/01 , H02M1/00
摘要： A power converter is configured to convert, into an AC voltage, a DC voltage supplied from a DC power supply connected between a first power supply wiring and a first ground wiring. A control device is connected between a second power supply wiring and a second ground wiring. The second power supply wiring is configured to supply a second power supply voltage lower than the first power supply voltage. The control device is configured to control the power converter. A separation device is configured to separate the first ground wiring and the second ground wiring from each other. The first ground wiring and the second ground wiring are electrically connected to each other at a single node.
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10.发明授权公开(公告)号：US10938318B2
公开(公告)日：2021-03-02
申请号：US16605369
申请日：2017-07-07
发明人： Kenji Iwazaki , Takashi Yamakawa , Shigeo Umehara
摘要： An AC-DC converting apparatus includes: a boost circuit including a reactor supplied with power supply voltage output from an alternating-current power supply, a first leg including a first upper-arm element and a first lower-arm element connected in series, and a second leg connected in parallel with the first leg and including a second upper-arm element and a second lower-arm element connected in series, and boosting the power supply voltage; and a first voltage detecting unit detecting the power supply voltage. When the power supply voltage is positive, the AC-DC converting apparatus causes the first lower-arm element and the second upper-arm element to perform boosting operation alternately every power supply cycle that is cycle of the power supply voltage, and when the power supply voltage is negative, the AC-DC converting apparatus causes the first upper-arm element and the second lower-arm element to perform boosting operation alternately every power supply cycle.
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