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MOSFET01:16

MOSFET

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The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...
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Characteristics of MOSFET01:17

Characteristics of MOSFET

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Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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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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MOSFET Amplifiers01:17

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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

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Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
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A reliable voltage clamping submodule based on SiC MOSFET for solid state switch.

Shaoxiang Ma1, Wentong Shang1, Dongyu Wang1

  • 1State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.

The Review of Scientific Instruments
|March 2, 2021
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A new solid-state switch using Silicon Carbide MOSFETs protects fusion gyrotrons from damaging breakdowns. This Advanced Chopper Sub-Model ensures rapid, safe power interruption, safeguarding critical fusion energy systems.

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Area of Science:

  • Plasma physics and fusion energy research.
  • Power electronics and semiconductor devices.

Background:

  • Electron cyclotron resonance heating is vital for controlled nuclear fusion.
  • Gyrotrons, key components, are vulnerable to breakdowns from their high-voltage power supplies.
  • Breakdowns can cause significant energy damage to gyrotrons.

Purpose of the Study:

  • To develop a solid-state switch for protecting gyrotrons during breakdowns.
  • To address challenges of rapid switching and voltage imbalance in Silicon Carbide (SiC) MOSFETs.
  • To propose a reliable module for fast high-voltage blocking and energy limitation.

Main Methods:

  • Development of an Advanced Chopper Sub-Model using SiC MOSFETs with a voltage-clamped circuit.
  • Validation through SPICE simulations and double-pulse tests.
  • Protection performance testing using a spark gap to simulate faults.

Main Results:

  • The proposed module enables rapid switching-off speeds, low overvoltage, and good voltage balancing.
  • Series-connected modules effectively handle driver time delays.
  • A 64-module switch demonstrated a turn-off time of ~5 µs and limited turn-off energy to 0.283 J at 30 kV/6 A.

Conclusions:

  • The Advanced Chopper Sub-Model provides a reliable solution for solid-state switching in fusion gyrotron protection.
  • SiC MOSFETs, when integrated into this module, overcome switching speed limitations for improved performance.
  • The developed switch effectively protects gyrotrons, enhancing the reliability of fusion energy systems.