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Generator Voltage Control01:21

Generator Voltage Control

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Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
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A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.
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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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Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational...
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A full-wave rectifier is a device that converts alternating current (AC) to direct current (DC) and is more efficient than its half-wave counterpart. It typically includes a center-tapped transformer, two diodes, and a load resistor. The secondary winding of the transformer is divided to provide two equal voltages of opposite polarities, which is the pivotal element of full-wave rectification.
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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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使用IGBT切换的可变脉冲宽度的磁场发生器电路.

Taichi Takezaki1, Mayuko Koga2, Takuya Sugimoto3

  • 1Faculty of Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan.

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概括

研究人员使用绝缘门双极晶体管 (IGBT) 开关开发了一个电路,以产生具有可变脉冲宽度的高磁场. 一个外部电路有效地管理突变电压,使得脉冲磁场的精确控制.

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科学领域:

  • 电气工程 电气工程
  • 电磁主义 电磁主义
  • 固态物理 固态物理

背景情况:

  • 产生具有可变脉冲宽度的高磁场对于各种应用至关重要.
  • 在像线圈这样的感应负荷中,高电流切换会产生突变电压,这可能会损坏切换设备.
  • 现有的可变脉冲宽度生成方法面临着诱导能量消散的挑战.

研究的目的:

  • 提出和分析一种电路,用于产生具有可控制脉冲宽度的高磁场.
  • 为了减轻在感应负载中高电流切换时的冲压问题.
  • 为了展示脉冲磁场与可变脉冲宽度的实现.

主要方法:

  • 设计了一个使用隔热门双极晶体管 (IGBT) 开关的电路.
  • 包含一个外部并行电路来吸收和消散感应能量.
  • 对分析解决方案进行了电路分析,并利用电路模拟来验证结果.
  • 研究过渡响应波形的突变电压和电流.

主要成果:

  • 对冲电压和电流波形的分析和模拟结果显示出很好的一致性.
  • 根据外部电路参数 (电阻和电容) 确定了冲压和电流衰变时间常数之间的权衡.
  • 成功地证明了在任意时间使用反系列IGBT中断放电电流 (500A峰值,1ms FWHM,3kV激增) 的成功.

结论:

  • 拟议的电路有效地产生具有可变脉冲宽度的高磁场.
  • 平行外部电路成功地管理了感应能量和突变电压,保护开关设备.
  • 开发的系统可用于各种应用,精确控制脉冲磁场的产生.