CN-224231862-U - Electric field sensor circuit of overhead line comprehensive detection device

Abstract

The utility model discloses an electric field sensor circuit of an overhead line comprehensive detection device, which comprises a high-impedance input module, a signal conditioning module and an output module, wherein the high-impedance input module is used for converting an induction signal into a voltage signal, the input end of the high-impedance input module is connected with an induction signal port, the output end of the high-impedance input module is connected with the input end of the signal conditioning module, the output end of the signal conditioning module is connected with the output module, and the high-impedance input module comprises a sixth resistor, a fifteenth capacitor, a sixteenth capacitor, an eighteenth capacitor, a fourth resistor, a fourteenth capacitor, a seventeenth capacitor, a seventh resistor, a fifth resistor and an operational amplifier. The utility model can realize the small modularization of the electric field sensor. The utility model can be widely applied to the technical field of sensors.

Inventors

• HE PENGFEI

Assignees

• 东莞市美志电子有限公司

Dates

Publication Date

20260512

Application Date

20250514

Claims (8)

1. 1. The utility model provides an electric field sensor circuit of overhead line integrated detection device which characterized in that, includes high impedance input module, signal conditioning module, output module, data acquisition and processing unit, power module and communication module, wherein: The high-impedance input module is used for converting an induction signal into a voltage signal, the input end of the high-impedance input module is connected with an induction signal port, the output end of the high-impedance input module is connected with the input end of the signal conditioning module, the output end of the signal conditioning module is connected with the input end of the output module, the output end of the output module is connected with the input end of the data acquisition and processing unit, and the data acquisition and processing unit is used for acquiring and analyzing the analog voltage signal; The high-impedance input module comprises a sixth resistor, a fifteenth capacitor, a sixteenth capacitor, an eighteenth capacitor, a fourth resistor, a fourteenth capacitor, a seventeenth capacitor, a seventh resistor, a fifth resistor and an operational amplifier, wherein a first end of the sixth resistor is connected with the sensing signal port, a second end of the sixth resistor is connected with the first end of the fifteenth capacitor, a first end of the sixteenth capacitor and an input end of the operational amplifier module, the second end of the fifteenth capacitor and a second end of the sixteenth capacitor are grounded, a negative input gain adjustment pin of the operational amplifier is connected with a first end of the fourth resistor, a positive input gain adjustment pin of the operational amplifier is connected with a second end of the fourth resistor, a differential input negative pin of the operational amplifier is connected with a second end of the fifth resistor, a first end of the fifth resistor is grounded, an input positive pin of the operational amplifier is connected with a second end of the sixth resistor, a second end of the eighteenth capacitor is connected with a second end of the eighteenth capacitor and a second end of the eighteenth capacitor is connected with a second end of the seventeenth capacitor, a differential input pin of the fourth resistor is connected with a fourth end of the seventeenth capacitor and a fourth resistor is connected with a fourth end of the eighth capacitor, a differential input pin of the fourth resistor is connected with the fourth end of the eighth resistor, and a differential input pin of the fourth resistor is connected with the seventeenth resistor is connected with the fourth end of the fourth resistor; The signal conditioning module comprises an eighth resistor, a ninth resistor and a nineteenth capacitor, wherein the first end of the eighth resistor is connected with the output end of the operational amplifier, the second end of the eighth resistor is connected with the first end of the ninth resistor, the first end of the nineteenth capacitor and the signal output interface of the output module, and the second end of the ninth resistor and the second end of the nineteenth capacitor are grounded.
2. 2. The electric field sensor circuit of the overhead line integrated detection device according to claim 1, wherein the sixth resistor, the fifteenth capacitor and the sixteenth capacitor form a pi-type RC low-pass filter network for suppressing high-frequency noise and power supply ripple in the induction signal.
3. 3. The electric field sensor circuit of the overhead line integrated detection device according to claim 1, wherein the fourth resistor and the fifth resistor form an operational amplifier inverting terminal feedback resistor network for setting a closed loop gain of the operational amplifier.
4. 4. The electric field sensor circuit of an overhead line integrated detection apparatus according to claim 1, wherein the seventh resistor and the seventeenth capacitor form a static bias resistor network for providing a midpoint voltage to the differential input stage.
5. 5. The electric field sensor circuit of an overhead line integrated detection apparatus according to claim 1, wherein the ninth resistor and the nineteenth capacitor form an output stage RC compensation network for matching output impedance and correcting high frequency phase offset.
6. 6. The electric field sensor circuit of an overhead line integrated detection apparatus according to claim 1, wherein the eighth resistor and the ninth resistor form an output-level voltage-division feedback network for adjusting an output voltage swing.
7. 7. The electric field sensor circuit of an overhead line integrated detection apparatus according to claim 1, wherein the fourteenth capacitor is a positive power rail decoupling capacitor for suppressing voltage fluctuations caused by transient currents.
8. 8. The electric field sensor circuit of the overhead line integrated detection device according to claim 1, wherein the eighteenth capacitor is a negative power rail decoupling capacitor and is used for filtering low-frequency power frequency interference and high-frequency switching noise.

Description

Electric field sensor circuit of overhead line comprehensive detection device Technical Field The utility model relates to the technical field of sensors, in particular to an electric field sensor circuit of an overhead line comprehensive detection device. Background The on-line comprehensive overhead line monitoring device is intelligent equipment for monitoring the running state of a power transmission line in real time, and aims to improve the safety of a power grid, prevent faults and optimize operation and maintenance efficiency. The on-line comprehensive monitoring device for the overhead line relies on a voltage sensor arranged on the on-line comprehensive monitoring device to detect voltage signals of the line in real time, but the voltage sensor generally adopts a high-voltage dividing capacitor to divide the voltage, the high-voltage dividing capacitor is directly contacted with the high-voltage signals, and if the high-voltage dividing capacitor is damaged and broken down in the using process, the voltage sensor and the on-line comprehensive monitoring device connected with the high-voltage dividing capacitor are easily damaged in a high-voltage environment. Therefore, the comprehensive detection device for the overhead line detects the voltage signal of the line in real time by adopting an electric field sensor, and avoids direct contact with a high-voltage electric signal. However, the existing electric field sensor has the defects that the electric field sensor circuit is difficult to integrate and high in cost because the high-impedance input stage depends on a junction field effect transistor or a special process operational amplifier, and the electric field sensor module is bulky because the signal conditioning circuit depends on passive elements required by multi-stage filtering and large-scale amplification. Therefore, the existing electric field sensor cannot meet the requirement of the overhead line comprehensive detection device on non-contact small-size modularization on high-voltage power grid monitoring. Disclosure of utility model In order to solve the technical problems, the utility model aims to provide an electric field sensor circuit of an overhead line comprehensive detection device, which can realize small modularization of an electric field sensor. The utility model adopts the technical scheme that the electric field sensor circuit of the overhead line comprehensive detection device comprises a high-impedance input module, a signal conditioning module, an output module, a data acquisition and processing unit, a power module and a communication module, wherein: The high-impedance input module is used for converting an induction signal into a voltage signal, the input end of the high-impedance input module is connected with an induction signal port, the output end of the high-impedance input module is connected with the input end of the signal conditioning module, the output end of the signal conditioning module is connected with the input end of the output module, the output end of the output module is connected with the input end of the data acquisition and processing unit, and the data acquisition and processing unit is used for acquiring and analyzing the analog voltage signal; The high-impedance input module comprises a sixth resistor, a fifteenth capacitor, a sixteenth capacitor, an eighteenth capacitor, a fourth resistor, a fourteenth capacitor, a seventeenth capacitor, a seventh resistor, a fifth resistor and an operational amplifier, wherein a first end of the sixth resistor is connected with the sensing signal port, a second end of the sixth resistor is connected with the first end of the fifteenth capacitor, a first end of the sixteenth capacitor and an input end of the operational amplifier module, the second end of the fifteenth capacitor and a second end of the sixteenth capacitor are grounded, a negative input gain adjustment pin of the operational amplifier is connected with a first end of the fourth resistor, a positive input gain adjustment pin of the operational amplifier is connected with a second end of the fourth resistor, a differential input negative pin of the operational amplifier is connected with a second end of the fifth resistor, a first end of the fifth resistor is grounded, an input positive pin of the operational amplifier is connected with a second end of the sixth resistor, a second end of the eighteenth capacitor is connected with a second end of the eighteenth capacitor and a second end of the eighteenth capacitor is connected with a second end of the seventeenth capacitor, a differential input pin of the fourth resistor is connected with a fourth end of the seventeenth capacitor and a fourth resistor is connected with a fourth end of the eighth capacitor, a differential input pin of the fourth resistor is connected with the fourth end of the eighth resistor, and a differential input pin of the fourth resistor is connected with the seventee