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公开(公告)号：US20200041185A1
公开(公告)日：2020-02-06
申请号：US16339332
申请日：2017-10-05
Applicant: Johnson Controls Technology Company
Inventor： Ivan Jadric , Ajit W. Kane
Abstract: Embodiments of the present disclosure relate to a heating, ventilating, air conditioning, and refrigeration (HVAC&R) system that includes a variable speed drive configured to provide power to a motor that drives a compressor of the HVAC&R system and a silicon carbide transistor of the variable speed drive, where the silicon carbide transistor is configured to adjust a voltage, or a frequency, or both of power flowing through the variable speed drive.
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公开(公告)号：US09621101B2
公开(公告)日：2017-04-11
申请号：US14962394
申请日：2015-12-08
Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANY
Inventor： Ajit W. Kane
CPC classification number: H02P27/06 , H02M1/126 , H02M1/44 , H02M5/44 , H02M5/4585 , H02M2001/123
Abstract: The variable speed drive system is arranged to receive input power at fixed input voltage magnitude and frequency and provide power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC source to convert the input voltage to a boosted DC voltage. A DC link connected to the converter filters the DC voltage from the converter stage. An inverter converts the DC link voltage into variable voltage and the variable frequency AC power. An electromagnetic compatibility (EMC) filter includes a series RC circuit from phase-to-ground circuit for each input phase of the converter. The RC circuit includes a resistor connected in series with a capacitor between the converter phase and ground. The EMC filter is connected to the line side of the converter. An inductor is connected between the input source and the EMC filter.
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Patent Agency Ranking
公开(公告)号：US11644226B2
公开(公告)日：2023-05-09
申请号：US16649852
申请日：2018-09-24
Applicant: Johnson Controls Technology Company
Inventor： Ajit W. Kane , Scott V. Slothower
CPC classification number: F25B49/025 , F25B49/022 , H02P27/06 , F25B2700/151
Abstract: A chiller assembly is provided. The chiller assembly includes a compressor (102), a condenser (106), an expansion device and an evaporator (108) connected in a closed refrigerant circuit. The chiller assembly further includes a motor (104) connected to the compressor to power the compressor, and a variable speed drive (110) connected to the motor to power the motor. The variable speed drive is operable to provide a variable voltage to the motor and a variable frequency to power the motor. The variable speed drive includes multiple sensors and an input current estimator that determines an estimated RMS input current based on sensor data received from the sensors. The chiller assembly further includes a control panel to control operation of the variable speed drive.
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公开(公告)号：US10859300B2
公开(公告)日：2020-12-08
申请号：US16339332
申请日：2017-10-05
Applicant: Johnson Controls Technology Company
Inventor： Ivan Jadric , Ajit W. Kane
Abstract: Embodiments of the present disclosure relate to a heating, ventilating, air conditioning, and refrigeration (HVAC&R) system that includes a variable speed drive configured to provide power to a motor that drives a compressor of the HVAC&R system and a silicon carbide transistor of the variable speed drive, where the silicon carbide transistor is configured to adjust a voltage, or a frequency, or both of power flowing through the variable speed drive.
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公开(公告)号：US20200278141A1
公开(公告)日：2020-09-03
申请号：US16649852
申请日：2018-09-24
Applicant: Johnson Controls Technology Company
Inventor： Ajit W. Kane , Scott V. Slothower
Abstract: A chiller assembly is provided. The chiller assembly includes a compressor (102), a condenser (106), an expansion device and an evaporator (108) connected in a closed refrigerant circuit. The chiller assembly further includes a motor (104) connected to the compressor to power the compressor, and a variable speed drive (110) connected to the motor to power the motor. The variable speed drive is operable to provide a variable voltage to the motor and a variable frequency to power the motor. The variable speed drive includes multiple sensors and an input current estimator that determines an estimated RMS input current based on sensor data received from the sensors. The chiller assembly further includes a control panel to control operation of the variable speed drive.
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公开(公告)号：US10125780B2
公开(公告)日：2018-11-13
申请号：US14827399
申请日：2015-08-17
Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANY
Inventor： Jeb W. Schreiber , Ajit W. Kane
IPC: F04B17/00 , F04D27/00 , F04D29/048 , F04D29/058 , H02J9/06 , F04D25/06 , F04D27/02
Abstract: A method of monitoring a backup battery for a magnetic bearing centrifugal compressor. The method includes: establishing threshold voltage values applicable to the battery backup battery level; monitoring the actual voltage of the battery backup; comparing the actual voltage of the battery backup to the threshold voltage; initiating a soft shutdown of the magnetic bearing centrifugal compressor if the magnetic bearing centrifugal compressor is operating and the actual voltage is below the threshold voltage for a defined period of time; preventing the magnetic bearing centrifugal compressor from starting if the magnetic bearing centrifugal compressor is not operating and the actual voltage is below the threshold voltage; or allowing the magnetic bearing centrifugal compressor to continue operation or begin operation if the actual voltage is greater than the threshold voltage.
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公开(公告)号：US09590540B2
公开(公告)日：2017-03-07
申请号：US14649052
申请日：2014-01-28
Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANY
Inventor： Zhiqiao Wu , Ajit W. Kane , Shreesha Adiga-Manoor
CPC classification number: H02P6/28 , F02M25/0836 , H02M1/12
Abstract: A system or method controlling a variable speed drive based on PWM techniques, wherein a first PWM method is used when the input current is less than a predetermined threshold value, for higher efficiency and lower total harmonic distortion (THD); and a second PWM method comprising a discontinuous modulation signal is used when the input current is greater than the predetermined threshold value for higher efficiency. By doing so, the maximum efficiency of VSD within the whole operation range can be achieved.
Abstract translation: 一种基于PWM技术控制变速驱动器的系统或方法，其中当输入电流小于预定阈值时使用第一PWM方法，以实现更高的效率和更低的总谐波失真（THD）; 并且当输入电流大于预定阈值以便更高效率时，使用包括不连续调制信号的第二PWM方法。 通过这样做，可以实现整个操作范围内VSD的最大效率。
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