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相关概念视频

Bridge rectifier01:24

Bridge rectifier

586
The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
Operationally, the bridge rectifier allows current flow through two of its diodes during each...
586
Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

411
The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
In a practical transformer, each winding exhibits resistance and leakage reactance. The...
411
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

763
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
763
Equivalent Capacitance01:19

Equivalent Capacitance

1.4K
Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
The following strategies are adopted to calculate...
1.4K
Three-Winding Transformers01:19

Three-Winding Transformers

221
Three identical single-phase transformers can be configured to form a three-phase transformer connection, which involves high-voltage and low-voltage windings. The high-voltage windings are denoted by capital letters A-B-C, while the low-voltage windings are labeled with lowercase letters a-b-c, representing their respective phases. This notation helps distinguish between the high and low voltage sides of the transformer.
In the per-unit equivalent circuit of a grounded Y-Y three-phase...
221
Transformers with Off-Nominal Turns Ratios01:25

Transformers with Off-Nominal Turns Ratios

149
In scenarios involving parallel transformers with disparate ratings, developing per-unit models requires accommodating off-nominal turns ratios. This situation arises when the selected base voltages are not proportional to the transformer’s voltage ratings. Consider a transformer where the rated voltages are related by the term a. If the chosen voltage bases satisfy a relationship involving term b, term c is defined as the ratio of these bases. This ratio is then substituted into the...
149

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相关实验视频

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Fabrication and Characterization of Superconducting Resonators
10:26

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基于多个变压器的高精度共振电容桥的研究.

Xin Liu1, Yuzhu Chen1, Longqi Wang1

  • 1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.

Sensors (Basel, Switzerland)
|June 27, 2024
PubMed
概括

这项研究提出了一种新的方法,用于降低在共振桥上的热噪声,用于引力波检测. 这种新方法提高了Taiji程序的灵敏度,提高了电容感应分辨率.

关键词:
引力波是一种引力波.低频度测量测量低频度测量测量低频度测量噪声分析 噪声分析一个共振桥的共振桥.变压器变压器变压器变压器

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科学领域:

  • 天体物理学和宇宙学
  • 引力波天文学 引力波天文学
  • 仪器仪表和测量仪器的使用

背景情况:

  • 太极计划旨在检测中低频率的引力波 (0.1毫赫兹到1赫兹).
  • 为了达到所需的加速残留灵敏度 (3 × 10-15 ms-2 / Hz 1/2) 需要1aF / Hz 1/2的电容感应分辨率.
  • 现有的共振电容桥在降噪和参数优化方面面临着挑战.

研究的目的:

  • 引入一种新的方法来减少共振电容桥上的热噪声.
  • 为了提高引力波检测系统的电容传感分辨率.
  • 为了减轻对桥梁系统内的其他参数的性能要求.

主要方法:

  • 开发了一种新的方案,以减少桥梁的热噪声,而不必优化现有的变压器参数.
  • 利用模拟来预测降噪和参数影响.
  • 对拟议的降噪方案进行实验验证.

主要成果:

  • 模拟显示噪声降低到原始水平的0.7倍.
  • 该方案在与其他参数优化相结合时,进一步降低了噪音.
  • 实验结果证实噪声降低0.7倍,电容感应分辨率提高到0.6aF/Hz1/2.

结论:

  • 拟议的方法有效地减少了共振电容桥梁中的热噪声.
  • 增强的电容传感分辨率支持太极计划的引力波检测目标.
  • 该方法减轻了其他桥梁性能参数的约束,并提高了对频率变化的稳定性.