Leakage current detection circuit for ADC sampling

A leakage current detection and detection circuit technology, applied in the directions of indicating the existence of current/voltage, measuring electricity, measuring devices, etc., can solve the problem that the signal is not suitable for ADC sampling and so on

Active Publication Date: 2016-03-16
浙江金乙昌科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The signal output by the amplifying circuit in the leakage current

Method used

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  • Leakage current detection circuit for ADC sampling

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing, the present invention will be further described with specific embodiment, see Figure 1-Figure 2 ;

[0019] It should be noted that the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth" in this embodiment ", "Ninth", "Tenth", "Eleventh", "Twelfth", "Thirteenth", "Fourteenth", "Fifteenth", "Sixteenth", "Twelfth Seventeen", "eighteenth", "nineteenth", "twentieth", "twenty-first", "twenty-second", "twenty-third", "twenty-fourth", "Twenty-fifth", "twenty-sixth", and "twenty-seventh" are not limitations on the number of relevant technical features, but are named to distinguish technical features of the same category.

[0020] This embodiment provides a leakage current detection circuit for ADC sampling, including a current transformer detection circuit, a differential filter circuit, a differential proportional amplification circuit, a 4th order Butterworth filter and an absolute value circuit....

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PUM

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Abstract

The invention discloses a leakage current detection circuit for ADC sampling and can acquire voltage signals suitable for ADC sampling. The leakage current detection circuit for ADC sampling comprises a current transformer detection circuit used for outputting a differential voltage signal, a differential filtering circuit which is electrically connected with the current transformer detection circuit and is used for filtering high frequency ripples in the current transformer detection circuit when a power supply power source is coupled to a leakage current, a differential proportion amplification circuit which is electrically connected with the current transformer detection circuit and is used for converting the differential voltage signal outputted by the current transformer detection circuit into a single-end signal for proportion amplification, a four-order Butterworth filter which is electrically connected with the differential proportion amplification circuit and is used for filtering the high frequency ripples and carrying out proportional signal amplification, and an absolute value circuit which is electrically connected with the four-order Butterworth filter and is used for converting a power frequency AC signal inputted into the absolute value circuit into a steamed bread wave, and a voltage satisfying ADC sampling requirements is outputted.

Description

technical field [0001] The invention belongs to the technical field of leakage current detection circuits, and in particular relates to a leakage current detection circuit for ADC sampling. Background technique [0002] The Chinese utility model patent with the announcement number 203376382U and the publication date of January 01, 2014 discloses a leakage current detection device, which includes a toroidal magnetic core. The magnetic core is also wound with a secondary coil, the secondary coil is connected to a signal amplifying circuit, the signal amplifying circuit is connected to a signal comparison circuit, and the signal comparison circuit is connected to a leakage current signal indicator needle, and a shielding cover is arranged on the annular magnetic core. The signal output by the amplifying circuit in the leakage current detection device with this structure is not suitable for ADC sampling. Contents of the invention [0003] The purpose of the present invention ...

Claims

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Application Information

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IPC IPC(8): G01R19/15G01R31/02
Inventor 周皓陈小忠
Owner 浙江金乙昌科技股份有限公司
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