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Related Concept Videos

Switching of BJT01:22

Switching of BJT

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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
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Overcurrent Relays01:26

Overcurrent Relays

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Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
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Differential Relays01:20

Differential Relays

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Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
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Design Example: Frog Muscle Response01:14

Design Example: Frog Muscle Response

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A student is tasked to work on an intriguing experiment involving an RL (Resistor-Inductor) circuit to study the muscle response of a frog's leg to electrical stimulation. The RL circuit plays a crucial role in this experiment, providing the means to control and measure the electrical impulses that trigger muscle contraction.
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Directional Relays01:25

Directional Relays

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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Voltage Doubler Circuit01:23

Voltage Doubler Circuit

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A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.
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Related Experiment Video

Updated: Dec 23, 2025

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
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Published on: June 27, 2025

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Multifunctional Self-Powered Switch toward Delay-Characteristic Sensors.

Haoyu Wang1,2, Jiaqi Wang1,2, Xin Xia1

  • 1Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.

ACS Applied Materials & Interfaces
|April 28, 2020
PubMed
Summary

Researchers developed a novel electrostatic force-based switch (EFS) for smart cities. This self-powered sensor, combined with a triboelectric nanogenerator (TENG), enables high-voltage delay control and sensitive mechanical motion detection.

Keywords:
electrical switchelectrostatic forceoptical switchself-powered sensortriboelectric nanogenerator

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Smart City Technology

Background:

  • The expansion of smart cities relies heavily on the Internet of Things (IoT), requiring numerous sensors.
  • Powering these vast networks of sensing nodes presents a significant challenge.
  • Existing solutions often lack efficiency, cost-effectiveness, or integrated delay capabilities.

Purpose of the Study:

  • To design and demonstrate a novel electrostatic force-based switch (EFS) for IoT applications.
  • To enable direct detection or control of high-voltage electrical systems with inherent delay characteristics.
  • To develop a self-powered sensing system by integrating the EFS with a triboelectric nanogenerator (TENG).

Main Methods:

  • Fabrication of an electrostatic force-based switch (EFS) with self-contained delay characteristics.
  • Integration of the EFS with a triboelectric nanogenerator (TENG) to create a self-powered sensor.
  • Development of a mechanical motion-sensing system utilizing the self-powered EFS-TENG sensor.

Main Results:

  • The EFS demonstrated ease of fabrication, low cost, and high stability.
  • The combined EFS-TENG system achieved self-powered operation for sensors.
  • The mechanical motion-sensing system exhibited high sensitivity and active response to triggers.
  • The system successfully realized a high-voltage delay control functionality.

Conclusions:

  • The developed multifunctional self-powered switch offers a promising solution for powering IoT sensors in smart cities.
  • Integration with TENG technology enhances sensor capabilities, enabling self-powered operation and sensitive detection.
  • The EFS technology facilitates high-voltage delay control systems, expanding the application scope of smart sensing networks.