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Related Concept Videos

Active Filters01:25

Active Filters

856
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
856
Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
562
Op Amp AC Circuits01:18

Op Amp AC Circuits

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Within an audio system, the filter circuit plays a pivotal role in processing the amplified audio signal from an amplifier. Its primary function is significantly attenuating signal components with lower frequencies, thereby shaping the audio output. This circuit's operations are examined, focusing on the fundamental filter configuration. This configuration involves an operational amplifier arranged in an inverting setup coupled with resistors (R1 and R2) and a capacitor (C1).
238
Clipper Circuit01:18

Clipper Circuit

482
A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Superposition Theorem for AC Circuits01:13

Superposition Theorem for AC Circuits

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Consider encountering a circuit in a steady state where all its inputs are sinusoidal, yet they do not all possess the same frequency. Such a circuit is not classified as an alternating current (AC) circuit, and consequently, its currents and voltages will not exhibit sinusoidal behavior. However, this circuit can be analyzed using the principle of superposition.
The principle of superposition stipulates that the output of a linear circuit with several concurrent inputs is equivalent to the...
693

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An Ultra-Low-Temperature Alternating Current Filter.

Chenguang Zhang1, Xin Jiao1, Yingyu Wang2

  • 1School of Materials Science and Engineering, Tianjin Key Laboratory for Photoelectric Materials & Devices, Key Laboratory of Display Materials and Photoelectric Devices, Tianjin University of Technology, Tianjin, 300384, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|September 2, 2023
PubMed
Summary

This study introduces a novel ultra-low-temperature alternating current (AC) filter using a supercapacitor. This advanced filter reliably operates in extreme cold, overcoming limitations of traditional aluminum electrolytic capacitors.

Keywords:
alternating current filteringcarbon nano-oniongraphenelow temperaturessupercapacitors

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Electrochemistry

Background:

  • Traditional alternating current (AC) filters using aluminum electrolytic capacitors (AECs) exhibit poor performance at ultra-low temperatures (≤-30 °C).
  • This limitation hinders the reliable operation of electronic devices in extremely cold environments.

Purpose of the Study:

  • To develop a novel ultra-low-temperature AC filter with enhanced performance in extreme cold.
  • To investigate the potential of supercapacitors based on a unique hybrid structure for AC filtering applications.

Main Methods:

  • Fabrication of a high-frequency supercapacitor utilizing a covalently bonded hollow carbon onion-graphene hybrid structure.
  • Integration of the supercapacitor with a low-melting-point electrolyte.
  • Characterization of the filter's performance across a wide temperature range, including ultra-low temperatures.

Main Results:

  • The supercapacitor demonstrated excellent filtering capability and stable direct current (DC) output with low fluctuation coefficients between -50 °C and 0 °C.
  • The hybrid structure exhibited high electronic conductivity, efficient ion adsorption/desorption, and fast ion diffusion kinetics.
  • The developed AC filter showed a high negative phase angle, low dissipation factor, short resistor-capacitor time constant (τRC = 0.098 ms at 120 Hz), and high capacitance retention below -30 °C, outperforming AECs.

Conclusions:

  • The developed ultra-low-temperature AC filter, based on a novel supercapacitor, effectively overcomes the limitations of traditional AECs.
  • This advancement is a significant step towards enabling reliable electronic device operation in extremely cold conditions.
  • The covalently bonded hollow carbon onion-graphene hybrid structure is crucial for achieving superior low-temperature performance.