公开(公告)号：US20190319541A1

公开(公告)日：2019-10-17

申请号：US16347990

申请日：2016-12-22

Applicant: Mitsubishi Electric Corporation

Inventor： Satoshi MURAKAMI ,  Yuta KOMATSU ,  Ryosuke KOBAYASHI

IPC: H02M3/335 ,  H02M7/12 ,  H02M1/42

Abstract: A power conversion device including: a reactor formed such that a DC winding and a plurality of coupled windings are wound around one magnetic body, one end of the DC winding is connected to a voltage source, one end of each of the plurality of coupled windings is connected to another end of the DC winding, another end of each of the plurality of coupled windings is connected to each intermediate connection point between a plurality of upper and lower arms composed of switching elements, and a control device for controlling the switching elements, wherein switching of the upper arms or the lower arms is controlled in accordance with a magnitude of a duty of the switching operation and a magnitude relationship between DC current ripple and AC current ripple composing current ripple in the coupled windings.

公开(公告)号：US20190199241A1

公开(公告)日：2019-06-27

申请号：US16310231

申请日：2017-02-28

Applicant: Mitsubishi Electric Corporation

Inventor： Satoshi MURAKAMI ,  Ryosuke KOBAYASHI ,  Akira NAKAGAWA ,  Kimihiko TANAYA ,  Yusuke NARUSE ,  Yuichi MURAMOTO

IPC: H02M7/5387 ,  F02P3/01 ,  F02P23/04 ,  H02M1/34

CPC classification number: H02M7/53871 ,  F02P3/01 ,  F02P23/04 ,  H02M1/34 ,  H02M7/48 ,  H02M2001/0006 ,  H02M2001/0058 ,  Y02B70/1491

Abstract: A resonant inverter includes: an input capacitor; an inverter; a snubber circuit; a transformer having a primary winding connected to an AC end of the inverter; a resonant coil, a resonant capacitor, and a current sensor on the secondary winding side of the transformer; and a control unit, wherein, on the basis of current detected by the current sensor, the control unit controls switching elements so as to perform zero voltage switching at the time of turning-on, at a frequency at which a load including the resonant coil and the resonant capacitor becomes capacitive, and performs power regeneration of energy stored in a snubber capacitor to a DC voltage source.

公开(公告)号：US20190301765A1

公开(公告)日：2019-10-03

申请号：US16315898

申请日：2017-05-01

Applicant: Mitsubishi Electric Corporation

Inventor： Ryosuke KOBAYASHI ,  Takashi MORIYAMA ,  Hiroyasu IWABUKI ,  Hiroki MURAKAMI ,  Hisanori YAMASAKI

IPC: F24F11/80 ,  H02P5/74 ,  H02P11/00 ,  H02P4/00

Abstract: An air-conditioning apparatus includes: a plurality of compressors included in one or more refrigerant circuits which air-condition a target space to be air-conditioned; a power converter which converts electric power supplied from a power source unit and supply the compressors with electric power for driving the compressors at an arbitrary drive rotation speed; a switching device which perform switching between a power supplying operation to cause each of the compressors to be supplied with electric power from the power converter and a power supplying operation to cause each of the compressors to be supplied with electric power directly from the power source unit; and a controller which controls the power converter and the switching device.

公开(公告)号：US20230179085A1

公开(公告)日：2023-06-08

申请号：US17917628

申请日：2020-07-13

Applicant: Mitsubishi Electric Corporation

Inventor： Yasuaki FURUSHO ,  Ryota ASAKURA ,  Ryosuke KOBAYASHI ,  Mamoru KAMIKURA

IPC: H02M1/12

CPC classification number: H02M1/126

Abstract: Provided is a low-cost noise filter having a noise suppression effect that is not reduced even when a resonance frequency changes according to changes in temperature. A noise filter includes: a noise detection unit which detects a common mode noise; a cancellation signal output unit; an injection unit which injects a cancellation signal; and a grounded capacitor. The cancellation signal output unit includes a filter part which generates the cancellation signal from the common mode noise, and an amplification part which amplifies the cancellation signal. A temperature dependence of a product of an inductance value and a capacitance value of a main circuit portion including the noise detection unit, the injection unit, and the grounded capacitor, and a temperature dependence of a product of an inductance value and a capacitance value of the filter part, are equal to each other.