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Three-phase alternating current detection method

A three-phase alternating current and detection method technology, applied in the field of power electronics, can solve the problems of high cost, few detection functions, and many devices

Active Publication Date: 2016-03-02
SHENZHEN HOPEWIND ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] figure 1 The phase loss detection circuit of the prior art shown uses many components, the cost is high, and the detection function is less

Method used

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Embodiment Construction

[0034] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] see figure 2 It is a structural diagram of a three-phase alternating current detection circuit according to an embodiment of the present invention. The detection circuit of the three-phase alternating current in the embodiment of the present invention includes a rectification and voltage division circuit 101 , a filter circuit 102 , a filter adjustment circuit 103 and a control core 104 .

[0036] Wherein, the rectification and voltage division circuit 101 is used to rectify and divide the input three-phase alternating current. Specifically, the rectification and voltage dividing circuit 101 includes three first voltage dividing resistors whose resistances are all R11, a second voltage dividing resistor and a t...

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Abstract

The invention discloses a three-phase alternating current detecting method. The method comprises the following steps: carrying out rectification, pressure division and filtration on an input three-phase alternating current to obtain an output voltage; sampling the output voltage through a control chip, and calculating within the sampling time t to obtain an average sampling value; and comparing the average sampling value with preset minimum and maximum reference voltages, and judging that the three-phase alternating current is in a default-phase state or a normal state according to a comparative result. The three-phase alternating current detecting method has the beneficial effects that a default-phase detecting circuit is simple, low in cost and wide in application range; the effective values of phase voltages of default-phase and normal three-phase alternating currents can be respectively detected; the default-phase judgment and voltage detection are accurate, few resources are occupied, and the heat loss is low.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, to a detection method for three-phase alternating current. Background technique [0002] The current SVG, frequency converter and other products may damage the product or load equipment if no protection is performed when the three-phase AC power is out of phase. Therefore, it is necessary to implement phase loss protection for SVG, frequency converter and other products. The implementation of phase loss protection must first detect the lack of phase of the three-phase AC. [0003] see figure 1 The utility model is a three-phase alternating current phase loss detection circuit in the prior art. The R, S and T phases of the three-phase alternating current are divided and attenuated by resistors R1, R1' and R1'' respectively, and then rectified by a three-phase rectifier bridge composed of diodes D1, D2, D3, D4, D5 and D6. After the full-wave rectification, the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/16
Inventor 姜珂曹晓生
Owner SHENZHEN HOPEWIND ELECTRIC CO LTD