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公开(公告)号：US20190199230A1
公开(公告)日：2019-06-27
申请号：US16326038
申请日：2016-08-18
申请人： ABB SCHWEIZ AG
CPC分类号： H02M5/225 , H02J3/01 , H02J3/34 , H02M1/08 , H02M1/12 , H02M5/293 , H02M5/297 , H02M2001/0006 , H02M2007/4835
摘要： A method of decoupled modulation of a direct AC/AC MMC between a first AC network having a first waveform and a second AC network having a second waveform, the MMC having a double-star topology with a plurality of phase legs, each phase leg having a first branch and a second branch, each of the first and second branches comprising a plurality of series connected bipolar cells. The method includes performing a first modulation based on a reference signal of the first AC network, independently of a reference signal of the second AC network, to generate, for each phase leg, a first integer command signal corresponding to a first combination of cell states in the first and second branches of the phase leg needed for generating the first waveform. The method also comprises performing a second modulation based on the reference signal of the second AC network, independently of the reference signal of the first AC network to generate, for each phase leg, a second integer command signal corresponding to a second combination of cell states in the first and second branches of the phase leg needed for generating the second waveform. The method also includes, based on the first and second integer command signals, mapping to each branch a number of cell states to be used for concurrently generating both the first and second waveforms, generating branch-level command signals to a capacitor voltage balancing algorithm. The method also includes, based on the mapping and the balancing algorithm, sending firing signals to the plurality of cells of each branch.
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公开(公告)号：US10326380B2
公开(公告)日：2019-06-18
申请号：US15908860
申请日：2018-03-01
申请人： FANUC CORPORATION
发明人： Shinichi Mizukami
IPC分类号： H02M1/32 , H02M7/48 , H02P27/00 , H02M5/293 , H02M7/5387 , H02P29/024 , H02P3/00
摘要： A motor drive apparatus includes: a converter which converts AC power to DC power and to output the DC power to a DC link; an inverter including power devices which converts the DC power to AC power for driving a motor; a capacitor provided in the DC link; a shut-off circuit to open and close an electrical path between the AC power source and the converter; a constant current control unit which performs control in such a manner as to allow a constant current supplied by the capacitor to pass through a detection target power device among the power devices in the inverter; and an abnormality detection unit which detects an abnormality in the detection target power device based on changes in voltage between a collector and an emitter of the detection target power device during a period in which the constant current passes through the detection target power device.
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公开(公告)号：US20190148948A1
公开(公告)日：2019-05-16
申请号：US16132365
申请日：2018-09-15
发明人： Kuo-Chi Liu
摘要： A photovoltaic power circuit includes: a photovoltaic device, a resonant circuit, and a control circuit. The photovoltaic circuit receives light to generate an input voltage. The resonant circuit is coupled to the photovoltaic device, and converts the input voltage to an output voltage to supply electrical energy to a load circuit. The resonant circuit includes a resonant inverter, a primary resonator, and a secondary resonator. The resonant inverter receives the input voltage, and operates at least one switch therein according to a control signal, to convert the input voltage to an AC resonant voltage. The control circuit adjusts a switching frequency or a duty ratio of the control signal according to an input power or an output power, based on a resonant frequency of the resonant circuit, to determine a maximum power point.
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公开(公告)号：US20190131881A1
公开(公告)日：2019-05-02
申请号：US15798102
申请日：2017-10-30
发明人： Peda V. Medagam , Jack Yang
CPC分类号： H02M5/293 , H02M1/084 , H02M5/4585 , H02M2005/2932 , Y02B70/145
摘要： A phase converter that converts single phase AC electric power to balanced three phase AC power. Two input terminals are connectable to a single phase AC power source, and connect directly to two output terminals of the converter. The phase converter has a storage capacitor, three active half bridge modules connected to the storage capacitor and a controller. Two modules connect to the input terminals and charge the storage capacitor. The other module connects to a third output terminal. The controller switches the module connected to the third output terminal and one of the other modules to generate and shape a second phase and a resultant third phase.
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公开(公告)号：US10193466B2
公开(公告)日：2019-01-29
申请号：US15573046
申请日：2015-05-18
申请人： ABB SCHWEIZ AG
摘要： A method for controlling a modular multilevel converter to reduce the lower order harmonics generated by the converter is provided. The method may also reduce the overall switching loss of the converter by switching the switches close to fundamental switching frequencies while still reducing the lower order harmonics that are generated.
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公开(公告)号：US10170975B1
公开(公告)日：2019-01-01
申请号：US15906959
申请日：2018-02-27
发明人： Guang Feng , Qifeng Shi , Jiang Yu , Qiu Sha , Yong Xiong Lin
摘要： A controller for a switching power converter is provided with a single detection pin through which the controller monitors whether the switching power converter is connected to an AC mains. Should a voltage for the detection pin indicate that the switching power converter is disconnected from the AC mains, the controller asserts the detection pin voltage to trigger a bleeder circuit to discharge an X class capacitor.
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公开(公告)号：US20180337587A1
公开(公告)日：2018-11-22
申请号：US15773810
申请日：2016-10-31
CPC分类号： H02M1/08 , H02M1/32 , H02M5/293 , H02M2005/2932 , H03K17/28
摘要： A power switch apparatus for a power converter includes a semiconductor power switch and a gate drive unit connected to the semiconductor power switch for supplying gate drive signals to the semiconductor power switch to switch it on and off to cause the power converter to generate an alternating current voltage having a nominal operational frequency based on command signals received from a controller. The gate drive unit receives command signals based on the AC voltage to be generated and to alter the switching events of the semiconductor power switch by addition of a pre-defined jitter-like deviation to the gate drive signals such as to cause the power converter to generate an AC voltage having a modified operational frequency which partly and temporarily deviates from the nominal operational frequency by a pre-defined minimum percentage. A power converter comprising such a power switch apparatus is also disclosed.
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公开(公告)号：US10103645B2
公开(公告)日：2018-10-16
申请号：US15126356
申请日：2015-03-17
发明人： Hirofumi Akagi , Makoto Hagiwara
摘要： This power converter is provided with: three clusters (CLu, CLv, CLw) in which unit cells are cascade-connected; and power supplies of the same kind which are respectively connected to one end of each of the three clusters. Terminals of the three clusters at the side not connected to the power supplies are respectively connected to other ends of the power supplies connected to the other clusters to form a delta-connection configuration. Three connections of the delta-connection configuration are respectively connected to each of the U, V, and W phases of a three-phase alternating current, and power conversion between the power supplies and the three-phase AC is enabled. If DC power supplies (Vdcu, Vdcv, Vdcw) are employed as the power supplies, power conversion between the DC power supplies and the three-phase AC power supplies can be performed. If in-phase single-phase AC power supplies are employed as the power supplies, power conversion between either the single-phase AC power supplies and the three-phase AC power supplies, or the three-phase AC power supplies can be performed.
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公开(公告)号：US10084406B2
公开(公告)日：2018-09-25
申请号：US14967996
申请日：2015-12-14
申请人： Emerson Electric Co.
发明人： Ping Shan , Cai Bing Zhang
CPC分类号： H02P27/18 , H02M2005/2937 , H02P27/16
摘要： Exemplary embodiments or implementations are disclosed of methods, apparatus, and systems for operating motors in variable speed situations. In an exemplary implementation, a method of controlling a variable-speed motor includes defining a control duration as a predetermined number of cycles of a multiple-phase power supply. Each speed in a range of speeds is defined by a corresponding number of the cycles of the control duration. Power is provided to the motor from the power supply at a selected one of the speeds, by enabling input from the power supply for the number of the cycles of the control duration corresponding to the selected speed.
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公开(公告)号：US10033290B2
公开(公告)日：2018-07-24
申请号：US14122397
申请日：2012-05-07
申请人： Hironori Koyano , Takamasa Nakamura , Masao Saito , Kouji Yamamoto , Tsutomu Matsukawa , Manabu Koshijo , Junichi Itoh , Yoshiya Ohnuma
发明人： Hironori Koyano , Takamasa Nakamura , Masao Saito , Kouji Yamamoto , Tsutomu Matsukawa , Manabu Koshijo , Junichi Itoh , Yoshiya Ohnuma
IPC分类号： H02M5/29 , H02M5/293 , H02M7/00 , H05K7/14 , H02M5/14 , H01F30/14 , G01R35/00 , G01R25/00 , H02M1/42
摘要： There is disclosed a power conversion apparatus 3 for converting polyphase ac power directly to ac power. A conversion circuit includes first switching devices 311, 313, 315 and second switching devices 312, 314, 316 connected, respectively, with the phases R, S, T of the polyphase ac power, and configured to enable electrical switching operation in both directions. There are provided input lines R, S, T connected with input terminals of the switching devices and output lines P, N connected with output terminals of the switching devices. The output terminals of the first switching devices and the output terminals of the second switching devices are, respectively, arranged in a row. The first switching devices and second switching devices are arranged side by side with respect to a direction of the rows. The output lines are disposed below the input lines in an up and down direction.
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