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Leakage current detection circuit for adc sampling

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

Active Publication Date: 2018-03-27
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 detection device of this structure is not suitable for ADC sampling

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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Abstract

The invention discloses a leakage current detection circuit for ADC sampling, which can obtain a voltage signal suitable for the ADC. The leakage current detection circuit for ADC sampling includes a current transformer detection circuit, which is used to output a differential voltage signal; a differential filter circuit electrically connected to the current transformer detection circuit, which is used to filter out the current transformer detection circuit The power supply is coupled to the high-frequency ripple in the leakage current signal; a differential proportional amplifier circuit electrically connected to the current transformer detection circuit is used to convert the differential voltage signal output by the current transformer detection circuit into a single-ended signal, and For proportional amplification; the 4th-order Butterworth filter electrically connected to the differential proportional amplifier circuit is used to filter out high-frequency ripple and proportionally amplify the signal; the absolute value circuit electrically connected to the 4th-order Butterworth filter, It is used to convert the power frequency AC signal input into the absolute value circuit into a steamed bread wave, so as to output a voltage that meets the sampling requirements of the ADC.

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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Patent Type & Authority Patents(China)
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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