公开(公告)号：US09893670B2

公开(公告)日：2018-02-13

申请号：US15473688

申请日：2017-03-30

Applicant: Hitachi-Johnson Controls Air Conditioning, Inc.

Inventor： Rei Kasahara ,  Dongsheng Li

IPC: H02M5/42 ,  H02M7/68 ,  H02M3/24 ,  H02M7/44 ,  H02M7/521 ,  H02P27/08 ,  H02P6/18 ,  H02P21/24 ,  H02P6/04 ,  F25B49/02

CPC classification number: H02P27/08 ,  F25B13/00 ,  F25B49/025 ,  F25B2313/0293 ,  F25B2313/0294 ,  F25B2500/05 ,  F25B2600/021 ,  F25B2600/11 ,  F25B2700/15 ,  H02P6/04 ,  H02P6/18 ,  H02P21/24 ,  Y02B30/741

Abstract: A controller of an inverter control apparatus includes an A/D conversion unit that performs digital conversion of an input signal when a signal for either an A/D converter start trigger or an A/D converter start trigger is input thereinto; a first inverter control unit that generates the A/D converter start trigger which starts the A/D conversion unit, based on A/D converter start timing information and a first carrier signal; a second inverter control unit that generates the A/D converter start trigger which starts the A/D conversion unit, based on A/D converter start timing information and a second carrier signal; and an A/D start factor selection unit that receives either the A/D converter start trigger or the A/D converter start trigger and selects an A/D start factor at a predetermined period timing of an operation period of the first carrier signal and the second carrier signal.

公开(公告)号：US10680544B2

公开(公告)日：2020-06-09

申请号：US16088944

申请日：2017-10-24

Applicant: HITACHI-JOHNSON CONTROLS AIR CONDITIONING, INC.

Inventor： Ken Kishita ,  Dongsheng Li ,  Rei Kasahara

IPC: H02P27/12 ,  H02P21/00 ,  F24F11/86 ,  H02P21/22 ,  H02M7/48

Abstract: In order to achieve a power conversion device with which a motor can be stably driven, a power conversion device is provided with: an inverter, which converts supplied DC voltage to an AC output voltage and supplies the AC output voltage to windings, and which, in accordance with the DC voltage, changes the saturation level at which the output voltage is saturated, in order to drive a motor equipped with a stator having the windings and a rotor having permanent magnets; and a controller which, when the output voltage is lower than the saturation level, increases the output current of the inverter such that a magnetic flux that weakens or strengthens the magnetic flux generated by the permanent magnets is generated in the windings. An air conditioner including the power conversion device is also disclosed.

公开(公告)号：US10651774B2

公开(公告)日：2020-05-12

申请号：US15740152

申请日：2016-05-26

Applicant: Hitachi-Johnson Controls Air Conditioning, Inc.

Inventor： Dongsheng Li ,  Yasuo Notohara ,  Yuuji Yamamoto

IPC: H02P27/08 ,  H02P21/00 ,  H02P6/06 ,  H02P6/185 ,  H02P27/04 ,  H02P27/12

Abstract: An inverter, motor drive device and freezing device, with which it is possible to effectively suppress current beats in the event of over-modulation without requiring additional circuits. This motor driving device includes: a rectifier circuit that converts the AC voltage from an AC power supply into a DC voltage; a smoothing capacitor that smoothes the DC voltage output from the rectifier circuit; an inverter circuit that converts the DC voltage output from the smoothing capacitor into an AC voltage; and a controller that reduces the current beat component by estimating, using a phase locked loop process, the frequency, phase and amplitude of the current beat component in the output current of the inverter circuit, and corrects the voltage command to the inverter circuit on the basis of the estimated frequency, phase and amplitude.

公开(公告)号：US10594239B2

公开(公告)日：2020-03-17

申请号：US16076732

申请日：2017-11-09

Applicant: Hitachi-Johnson Controls Air Conditioning, Inc.

Inventor： Dongsheng Li ,  Ken Kishita

IPC: H02P21/05 ,  H02P21/18 ,  H02P21/22 ,  F25B31/02 ,  H02M7/5387 ,  H02P27/12 ,  H02M1/14 ,  H02M7/48 ,  H02M1/12 ,  H02M7/5395 ,  H02M1/00

Abstract: A motor drive that enables the elimination of distortion of a motor current caused by direct current voltage ripples with the use of a smoothing capacitor having a small capacity and refrigeration equipment. A motor drive includes a rectifier circuit, a smoothing capacitor, voltage detector, an inverter circuit, current sensor, and a controller configured to control the inverter circuit. The controller has a voltage controller configured to generate a voltage command value used for controlling the motor, a ripple frequency arithmetic unit configured to operate a ripple frequency included in the direct current voltage signal, and a harmonic suppressor configured to process a signal based on the direct current signal using an S controller having a gain near the ripple frequency and output a corrected amount. The inverter circuit is controlled based on a signal that the voltage command value is corrected using the corrected amount.