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A capacitor is charged by passing an electric current through it, which causes the plates to start accumulating an electrostatic charge. Since the strength of the charging current is maximum when the capacitor plates are uncharged and gradually decreases exponentially until the capacitor is fully charged, the charging process is neither instantaneous nor linear. The property of a capacitor to store a charge on its plates is called its capacitance.
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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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Design Example: Capacitance Multiplier Circuit01:20

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
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A Self-Compensating Non-Intrusive Ring-Type AC Voltage Sensor Based on Capacitive Coupling.

Junpeng Wang1,2, Jiacheng Li1,2, Chunrong Peng1,2

  • 1State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.

Micromachines
|November 27, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a self-compensating AC voltage sensor that minimizes errors from coupling capacitance variations. The novel design ensures accurate cable voltage measurements even with changing conditions and external interference.

Keywords:
AC voltagecapacitive couplingnon-intrusive measurementself-compensating

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Measurement Science

Background:

  • Coupling capacitance variations significantly impact non-intrusive AC voltage sensor accuracy.
  • Parasitic capacitance between the cable, sensor, and ground affects measurement sensitivity and introduces errors.

Purpose of the Study:

  • To develop a self-compensating, non-intrusive AC voltage sensor that mitigates coupling capacitance variations.
  • To analyze the theoretical model and quantify the impact of parasitic capacitance on sensor performance.

Main Methods:

  • Established a theoretical model to analyze parasitic capacitance effects.
  • Designed a ring-type inductive probe and signal processing circuit with reference signal compensation.
  • Incorporated an extended outer ring electrode and PTFE housing to minimize parasitic capacitance influence.

Main Results:

  • Achieved a linearity of 0.86% for AC voltage measurements from 0-1000 V.
  • Reduced worst-case measurement error to below 6.44% (a 21.4% improvement over uncompensated methods).
  • Demonstrated low error (<1.85%) under external interference and robustness to cable diameter/position changes.

Conclusions:

  • The developed sensor accurately measures cable voltage with high linearity and minimal error.
  • The self-compensating design effectively reduces the impact of coupling capacitance variations and external interference.
  • The sensor is suitable for reliable AC voltage measurement in diverse installation scenarios.