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Voltage sensor circuit

A voltage sensor and circuit technology, applied in the direction of using digital measurement technology for measurement, can solve problems such as loss of accuracy, and achieve the effect of improving the level of signal-to-noise ratio

Inactive Publication Date: 2018-09-28
NINGBO CRRC TIMES TRANSDUCER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of voltage sensor has the characteristics of non-contact and convenient application, but the signal path needs to go through many processes such as magnetic field signal acquisition, magnetoelectric conversion, etc., and there will be a certain loss in accuracy.

Method used

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] Such as Figure 1 to Figure 3 As shown, the voltage sensor circuit in this embodiment includes:

[0028] The primary-side high-voltage conditioning circuit 1 is electrically connected to the high-voltage detection terminal at the input end, and is used to obtain a differential mode voltage signal.

[0029] ΔΣADC converter 2, the input end of which is electrically connected to the output end of the primary side high-voltage conditioning circuit 1, is used to oversample the differential mode voltage signal and convert it into a digital signal; ΔΣADC converter 2 includes sequentially connected anti-aliasing Filter 21, modulator 22, filter 23, sampler 24, the input end of anti-aliasing filter 21 is electrically connected with the output end of primary side high voltage conditioning circuit 1, the output end of sampler 24 is connected with ...

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Abstract

The invention relates to a voltage sensor circuit which comprises a primary high-voltage conditioning circuit, a delta sigma AD (analog-to-digital) converter, a Manchester encoder, a high-frequency transformer, a differential to single end circuit, a Manchester decoder, a digital filter, a digital sampler, a control unit and a current driving circuit which are sequentially connected. An input endof the primary high-voltage conditioning circuit is electrically connected with a high-voltage detection end, the control unit comprises an MCU (micro-control unit) and a DAC (digital-to-analog converter) which are electrically connected, an input end of the MCU is electrically connected with the digital sampler, and an output end of the MCU is electrically connected with the DAC. According to thevoltage sensor circuit, bit rate is in communication by Manchester coding, the high-frequency transformer is used for primary and secondary isolation, high-precision sampling requirements are met bythe whole scheme, a high-voltage isolation function is achieved, and high-precision and high-isolation voltage acquisition requirements are really met.

Description

technical field [0001] The invention relates to a voltage sensor circuit, in particular to a voltage sensor circuit based on Manchester code stream. Background technique [0002] At present, voltage sensors are an important input for electrical equipment monitoring. Accurate, reliable and stable voltage measurement plays a vital role in maintaining the normal operation of electrical systems. At present, voltage sensors are mainly divided into two categories: non-isolated and isolated. [0003] The non-isolated voltage sensor relies on resistive voltage division to directly obtain the voltage drop across the sampling resistor, so as to calculate the voltage loaded on both ends of the voltage sensor. This type of non-isolated voltage sensor has the characteristics of low cost, high measurement accuracy, simplicity and reliability. However, its non-isolated nature makes it unsuitable for high-voltage measurement applications. [0004] The emergence of traditional isolated vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 曹力倪大成王飞郑良广陈浩高洁郑华雄任浩顾忠辉
Owner NINGBO CRRC TIMES TRANSDUCER TECH CO LTD