Proton Exchange Membrane Electrolyzer Emulator for Power Electronics Testing Applications

This article aims to develop a proton exchange membrane (PEM) electrolyzer emulator. This emulator is realized through an equivalent electrical scheme. It allows taking into consideration the dynamic operation of PEM electrolyzers, which is generally neglected in the literature. PEM electrolyzer dynamics are reproduced by the use of supercapacitors, due to the high value of the equivalent double-layer capacitance value. Steady-state and dynamics operations are investigated in this work. The design criteria are addressed. The PEM electrolyzer emulator is validated by using a 400-W commercial PEM electrolyzer. This emulator is conceived to test new DC-DC converters to supply the PEM ELs and their control as well, avoiding the risk to damage a real electrolyzer for experiment purposes. The proposed approach is valid both for a single cell and for the whole stack emulation.

Development of Low-Cost High-Power Sinusoidal Function Generator for Driving a Single Tone Wave into Speaker using Arduino Uno and 2N3055

Function generator is one of the most important equipment in electronics testing. However its cost can be quite prohibitive. In this work we will study how to transform a square wave generated by Arduino into a sine wave by using filter/amplifier based on 2N3055, thus enabling low-cost high-power function generator. Said function generator will be shown to be capable of producing sine wave with frequency between 500Hz-10KHz. With proper tuning it is capable of achieving up to 0.6% accuracy within the desired value.

Measuring the Shielding Effectiveness of Small Enclosures

Research on the shielding effectiveness (SE) of small shielding enclosures has attracted more and more attention since small shielding enclosures are widely applied in many areas, such as aviation electronics, testing equipment and industrial control. There is still not proper standard to follow for SE tests in a reverberation chamber. The SE of a small enclosure is simulated and measured by moving a field probe along particular positions inside the enclosure using a reverberation chamber.