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Related Concept Videos

First-Order Circuits01:15

First-Order Circuits

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First-order electrical circuits, which comprise resistors and a single energy storage element - either a capacitor or an inductor, are fundamental to many electronic systems. These circuits are governed by a first-order differential equation that describes the relationship between input and output signals.
One common example of a first-order circuit is the RC (resistor-capacitor) circuit. These circuits are used in relaxation oscillators such as neon lamp oscillator circuits. When voltage is...
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RC Circuits: Discharging A Capacitor01:27

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One of the applications of an RC circuit is the relaxation oscillator. The relaxation oscillator comprises a voltage source, a capacitor, a resistor, and a neon lamp. The lamp acts like an open circuit (infinite resistance) until the potential difference across the neon lamp reaches a specific voltage. At that voltage, the lamp acts like a short circuit (zero resistance), and the capacitor discharges through the neon lamp and produces light. Once the capacitor is fully discharged through the...
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Clamper Circuit01:14

Clamper Circuit

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A clamper circuit, also known as a DC restorer, represents a specialized variant of the rectifier circuit, notable for its method of taking the output across the diode rather than the capacitor. This configuration lends to several distinctive applications, particularly in handling square wave inputs.
Within this circuit, the diode's orientation prompts the capacitor to charge up to the level of the most negative peak of the input signal. Upon reaching this state, the diode ceases to...
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Series R—L Circuit Transients01:22

Series R—L Circuit Transients

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In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists...
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RL Circuit with Source01:14

RL Circuit with Source

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When an RL (Resistor-Inductor) circuit is connected to a DC source, the complete response of the circuit can be divided into two parts: the transient response and the steady-state response.
The transient response of the circuit is its temporary reaction to the sudden application of the DC source. This response is characterized by a current that exponentially decays to zero as time approaches infinity. During this transitional period, the inductor behaves like a short circuit, causing the source...
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Parallel RLC Circuits01:14

Parallel RLC Circuits

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Street lamps equipped with RLC surge protectors are an excellent example of applying circuit analysis in practical scenarios. These surge protectors safeguard the lamp's components against sudden voltage spikes.
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Updated: May 14, 2025

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A Second-Order Fast Discharge Circuit for Transient Electromagnetic Transmitter.

Chao Tan1, Shibin Yuan1, Linshan Yu1

  • 1College of Electrical and New Energy, China Three Gorges University, Yichang 443002, China.

Sensors (Basel, Switzerland)
|April 12, 2025
PubMed
Summary
This summary is machine-generated.

A new circuit design significantly reduces turn-off times for transient electromagnetic (TEM) transmitters. This innovation ensures a fast, load-independent discharge, improving transmitter performance and efficiency.

Keywords:
TEMcircuit topologymathematical modelssecond-order circuitturn-off timevoltage stress

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Power Electronics

Background:

  • Transient Electromagnetic (TEM) transmitters often face challenges with long turn-off times, particularly with inductive loads.
  • This limitation can impact the efficiency and performance of TEM systems.

Purpose of the Study:

  • To introduce and analyze a novel second-order fast discharge circuit topology for TEM transmitters.
  • To address and mitigate the issue of prolonged turn-off durations in TEM transmitters.

Main Methods:

  • A new second-order circuit topology was integrated into the standard H-bridge structure, incorporating a capacitor, two Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs), and two resistors.
  • The operating principles of the four stages were analyzed, and mathematical models for turn-off time and MOSFET voltage stress were developed.
  • Resistor and capacitor parameters were optimized for a fixed transmitter coil.

Main Results:

  • The proposed topology demonstrated a current-independent turn-off time, achieving the shortest duration at 50 A compared to other topologies.
  • Lower voltage stress on the MOSFET was observed at 9 A.
  • Experimental results confirmed a consistent turn-off time of approximately 64 μs across various current loads (1 A, 5 A, 9 A).
  • RLC series resonance further reduced the turn-off time to 58 μs, maintaining load-current independence.

Conclusions:

  • The novel second-order fast discharge circuit effectively reduces MOSFET turn-off times in TEM transmitters.
  • The circuit's performance is characterized by a load-current-independent turn-off duration and reduced voltage stress.
  • This advancement offers a significant improvement for TEM transmitter design and application.