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Phase sequence detection

A phase sequence detection and phase sequence technology, applied in phase sequence/synchronization indication, electrical measurement, short-circuit test, etc., to achieve the effect of efficient and fast work

Active Publication Date: 2015-09-23
比泽尔电子公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this phase sequence detector is not suitable for frequency controlled compressors, where the mains phase will vary, for example, between 20 Hz and 200 Hz

Method used

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Examples

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Embodiment Construction

[0082] figure 1 A block diagram of one embodiment of the invention is shown. figure 1 It includes an electric compressor M or other motor driven by a three-phase AC power supply comprising three phases L1, L2, L3 with a phase difference of 120 degrees from each other. For the purposes of this description and example, assume that compressor M is configured such that phase L2 is 120 degrees behind phase L1, and phase L3 is 240 degrees behind phase L1, resulting in the correct phase sequence L1 - L2 - L3. However, any phase sequence standards and phase naming conventions are within the scope of this invention, so when this specification refers to correct, incorrect or reversed phase sequences, L1, L2 and L3, etc., the skilled person will be able to apply this to a particular situation, naming scheme and requirements.

[0083] figure 1 A phase sequence detector including a pulse generator PG and a pulse analyzer PA is also included. The pulse generator PG has three phase input...

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Abstract

The invention relates to a phase sequence detector suitable for use with 3-phase pulsed motor driver signals and to a phase sequence detection method suitable to determine phase sequence and phase loss states in 3-phase variable frequency motor driver signals.

Description

technical field [0001] The present invention relates to a phase sequence detector for use with a frequency controlled compressor, and a method for detecting the phase sequence of a variable frequency power supply signal. Background technique [0002] Electric compressors and other motors driven by three-phase AC power are often sensitive to the sequence of the three phases. Some devices may fail, or even be damaged, if they are connected incorrectly to the power supply, in some devices the compressor or motor will run but reverse, which tends to cause problems for the rest of the system to which the compressor or other motor belongs. [0003] Different kinds of phase sequence detectors have been developed, which will notify the user or turn off the power if a wrong phase sequence is detected. Some of the phase sequence detectors described above operate by means of optocouplers forming pulses indicative of the phase difference between the three mains phases. However, for a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/18G01R31/02H02H3/34
CPCG01R31/026H02H7/09G01R29/18G01R31/54G01R31/52
Inventor 克里斯蒂安·埃克霍尔德
Owner 比泽尔电子公司