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Hybrid pulse width modulation method for variable speed drive

A technology of hybrid pulse width modulation and variable speed transmission, which is applied in the direction of motor control, AC motor control, power plant, etc., to achieve the effects of high total efficiency, improved THD, and low total harmonic distortion

Active Publication Date: 2015-09-16
JOHNSON CONTROLS TYCO IP HLDG LLP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although several different PWM schemes exist, only one method is generally used to operate the VSD over the entire operating range

Method used

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  • Hybrid pulse width modulation method for variable speed drive
  • Hybrid pulse width modulation method for variable speed drive
  • Hybrid pulse width modulation method for variable speed drive

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Embodiment Construction

[0021] Before turning to the figures illustrating in detail the illustrative embodiments, it should be understood that the application is not limited to the details or methodology set forth in the following description or illustrated in the figures. It is also to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting.

[0022] Figure 1A with 1B The configuration of the system is generally shown. AC power 102 is supplied to a variable speed drive (VSD) 104 which feeds a motor 106 (see Figure 1A ) or multiple motors 106 (see Figure 1B ) to provide power. Motor(s) 106 are preferably used to drive a refrigeration or chiller system (see generally image 3 ) corresponding compressor. AC power source 102 provides single-phase or multi-phase (eg, three-phase), fixed voltage, and fixed frequency AC power to VSD 104 from an AC power grid or distribution system existing at a location. The AC power s...

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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.

Description

[0001] Cross references to related patent applications [0002] This patent application claims U.S. Provisional Patent Application Serial No. 61 / 762,080, filed February 7, 2013, entitled "HYBRID PULSE WIDTH MODULATION METHOD FOR VARIABLE SPEED DRIVE" the priority and interest of , which is incorporated herein by reference. Background technique [0003] The present application generally relates to a method and system for controlling a variable speed drive (VSD). The present application more particularly relates to a hybrid pulse width modulation (PWM) method and system for controlling a VSD. [0004] Pulse Width Modulation (PWM) is a power modulation technique that has been used for varying power output in variable speed drives (VSD) for a long time. Although several different PWM schemes exist, generally only one method is used to operate the VSD over the entire operating range. [0005] Anticipated advantages of the disclosed systems and / or methods satisfy one or more of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/00H02P27/08
CPCF02M25/08F02M25/0836B60K15/035H02P6/28H02P29/50H02M1/12H02P2209/09Y10S388/912
Inventor 吴志峤A·W·凯恩S·阿蒂加-曼诺
Owner JOHNSON CONTROLS TYCO IP HLDG LLP