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Serially-connected arc fault detection circuit and serially-connected arc fault detection method

A technology of fault detection circuit and current detection circuit, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., and can solve problems such as poor accuracy and high circuit requirements

Inactive Publication Date: 2016-03-16
GREE ELECTRIC APPLIANCES INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the existing series arc fault detection circuit and method have high requirements on the circuit, and the accuracy is poor

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  • Serially-connected arc fault detection circuit and serially-connected arc fault detection method
  • Serially-connected arc fault detection circuit and serially-connected arc fault detection method
  • Serially-connected arc fault detection circuit and serially-connected arc fault detection method

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Embodiment Construction

[0045] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0046] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0047] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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Abstract

The invention discloses a serially-connected arc fault detection circuit and a serially-connected arc fault detection method. By introducing a zero cross detection circuit, an analog-digital conversion of detection signals (or further processed signals) of live line current can be carried out near an alternating voltage zero crossing point of a detected line, and the existence of the arc characteristics can be detected based on the digital signals achieved by the analog-digital conversion. Only the detection and the analog-digital conversion of the current signals of a part of the whole period are required, and therefore the requirements on the current detection circuit and the analog-digital conversion circuit can be lowered, and at the same time, the accuracy of the arc fault detection of the low power load or the pure resistive load can be guaranteed.

Description

technical field [0001] The invention relates to the field of electrical detection, in particular to a series arc fault detection circuit and method. Background technique [0002] Arc refers to the luminous discharge phenomenon produced by electricity passing through an insulating medium. The arc is characterized by high temperature, small current and short duration, and it will appear frequently once a breakdown point occurs. During arc discharge, a large amount of heat will be generated, which can ignite the surrounding flammable and explosive materials, causing fire or even explosion. Since alternating current is widely used in various electrical equipment, AC arc poses a great threat to electrical safety. [0003] In electrical appliances, it is necessary to detect electrical arc faults to prevent power failures such as poor contact of electrical power lines, aging lines and ignition, and to avoid electrical fires caused by line ignition. [0004] Series arc faults are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 叶振雄易强薄传海张有林
Owner GREE ELECTRIC APPLIANCES INC
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