株式会社 守谷商会

トランス性能を決定づける3つの定理

by Steven M. Sandler and Danny Chow, AEI Systems
この記事では著者はトランスの性能に関して、そして更に拡大してマグネティック・カップリングには3つの定理があると記述しています。

In the October 2009 Issue of the How2power Today Newsletter an article involving measurements with the Bode 100 has been published. In their article "Debunking Transformer Performance Myths" the authors Steven M. Sandler and Danny Chow of AEi Systems, Los Angeles, California intend to dispel three common myths regarding transformers, and more generally, magnetic coupling.

  • Myth 1: The turns ratio of a transformer is the transformer-myths01.gif and transformer-myths02.gif is the reciprocal of transformer-myths03.gif
  • Myth 2: The leakage inductance of a transformer is based on the coupling from one winding to another
  • Myth 3: The inductance of a transformer is transformer-myths04.gif

To provide the proof that these myths are false, three transformers were constructed. Each transformer included only two windings, with 15 turns on each winding. A series of measurements were made for each of the three transformers. All of the measurements were made using one piece of test equipment, OMICRON Lab's Bode 100 portable vector network analyzer.

Read the full story at: www.how2power.com/newsletters/0910/articles/a1/index.html

About the Authors:

transformer-myths05_large-thumb-200x229-148.jpg Steve Sandler is the founder and CTO of AEi Systems, LLC.
He is responsible for worst case circuit analysis of power, RF,
and linear systems as well as the design of AEi Systems line
of rad-hard dc-dc converters.
transformer-myths06_large-thumb-200x223-151.jpg Danny Chow is a Senior Engineering Specialist for AEi Systems, LLC
He is responsible for reliability engineering analysis
and bench testing operations.
transformer-myths07.jpgのサムネイル画像 About How2Power:
How2Power.com is a website created to help electrical engineers solve real-world design challenges in power management and power conversion as encountered in the design of power supplies and power systems.

プラナーコイルの特性とシミュレーション


by Florian Hammerle, MSc
この主論文はプラナーコイルの小型化を進めるに当たりその特性とシミュレーションについて記述されています。

In November 2009 Florian Hammerle was honored with the VDI award for his Master thesis "Simulation and Characterization of a Miniaturized Planar Coil" written at the Microtechnology Research Center of the University of Applied Sciences Vorarlberg (FHV).planar-coil-miniaturization01_large-thumb-200x150-131.jpg
In his work Florian focused on the experimental characterization and simulation of a planar coil for gaining a further miniaturized design.

For evaluating the simulation results the equivalent circuit parameters of the miniaturized planar coil were measured with OMICRON Lab's vector network analyzer Bode 100. Finaly the difference between the simulated results and the measured values was <5%.

We thank Florian for allowing us to offer a pdf of the complete thesis on our webpage.

Simulation and Characterization of a Miniaturized Planar Coil.pdf

About the Author:

planar-coil-miniaturization02_large-thumb-150x173-134.jpg

Florian Hammerle, MSc
has now finished his master studies
and is currently travelling the world.

About the FHV:
planar-coil-miniaturization03.jpg
The FHV - University of Applied Sciences is located in Vorarlberg, Austria.
Originally founded as an educational association called Technikum Vorarlberg in 1989 the FHV gained the academic status University of Applied Sciences in 1999.

In close cooperation with the internatonal industry the FHV operates research centers in the following sceintific fields:

  • Microtechnology
  • Process- and Product- Engineering
  • User- Centered Technologies
  • Society and Socio- Economics
オーディオアンプの修理

30年間使用したRevox A78のオーディオアンプを修理、その性能をBode100ベクトル・ネットワーク・アナライザーで計測しそのデータをドキュメント化しました。

audio-amplifier01_large-thumb-200x121-125.jpgaudio-amplifier02_large-thumb-200x118-128.jpg


A customer repaired his 30 years old RevoxA78 audio Amplifier. Using the Bode 100 Vector Network Analyzer, he documented the performance and success of his repair. This demonstrates what Bode 100 can do for audio applications.

If you want to share an application with our Internet community then please send us your document under info@omicron-lab.com.

For details on this application, download the complete manual.

Measuring an old audio amplifier with Bode 100.pdf

シラバス:水晶発振子の等価回路

by Christoph Busel, HTL Rankweil
このトピックは、著者である工科大学の教師が、我々と共同で行った講義の準備内容です。
大学教育における、Bode100の使用例となっています。

quartz-crystal-lesson01_large.jpgquartz-crystal-lesson02_large.gif

quartz-crystal-lesson01_large.jpg quartz-crystal-lesson02_large.gif
A teacher at a technical college shared his documentation for his quartz crystal lesson. In this documentation you can see the theory and the practical measurement with a Vector Network Analyzer.

Where is quartz used in modern electronics? What do you think is the reason quartz is used so often?
Quartz is used in electronic circuits to get a high accuracy time standard. Accuracy you need in clocks, computers, controllers, game boys, toys and many more.

After this lesson, you can answer the following questions:

  • What is the serial resonance?
  • What is the parallel resonance?
  • What is the anti-resonance?
  • How does the Q range of quartz compare to a RLC resonance circuit?
  • Why is the quartz frequency 32.768KHz so popular?
  • For details on this application, download the complete manual.

If you want to share an application with our Internet community, please send us your document to info@omicron-lab.com

Measuring equivalent circuit of quartz crystal with Bode 100.pdf