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Power & Energy

204 posts
There are affordable switch mode DC converters available. One that you see often is this Benq 12 V to 5V converter. I can find info on all components, except the inductor. And I don't have an inductance meter. There are several other ways to measure inductance. In this exercise I'm using the method with triangle waveform as described on meettechniek.info.   Ingredients: the inductor, desoldered a function generator with triangle waveform option an oscilloscope   The setup is str ...
When I saw Michael's post on a power supply for the Archeology Resistivity Meter that's being designed here in the community, I remembered I have a switch mode transformator in my scrap parts box. It's there since forever. I unsoldered it when throwing away a consumer product. Not to be reused in a circuit, but as a source for enamelled wire. The transfo has 12 pins. It's been so many years ago that I couldn't remember where I got it from. Out of curiousity I'm trying to find out what the l ...
There is a not so surprising trend to replace lead-acid batteries used in all kind of systems or devices with lithium-ion batteries (LIBs). When checking lead-acid batteries in these devices or systems by service technicians then often a battery tester like HIOKI's BT3554 is used. That raises the question whether this or any other battery tester can also be used in the same way as with lead-acid batteries. From a sensitivity point of view the BT3554 offers a 3 mOhm range - so even measuring larg ...
QuantumScape says it has developed a new battery technology that could be utilized in EVs by 2025, and it has more advantages over lithium-ion. (Image Credit: QuantumScape)   QuantumScape, a 10-year old startup based in California, says it has resolved issues with lithium. Volkswagen is expected to use pure metallic lithium in car batteries by 2025. QuantumScape also announced that it would be going public using a SPAC to list on the New York Stock Exchange in the fourth quarter. The post- ...
The other day I posted something in this group about how temperature affects a battery measurement because I wanted to find out how much that impact actually is. There was great feedback regarding this post in the comments (thank you very much for that!) and I also got feedback from outside of this forum. One of these comments from outside told me that I "commited a capital sin by using the brass tabs on the battery terminals to connect the Kelvin probes of the BT4560 test cables". Yes - I ha ...
The orange-tinted solar panels could be utilized in the future, allowing farmers to generate electricity while producing vegetables. (Image Credit: University of Cambridge)   In the future, farmers could grow their crops indoors underneath tinted semi-transparent solar panels, allowing them to generate electricity while growing vegetables. This is what researchers at the University of Cambridge have already achieved, and they say it could result in larger profits for farmers and maximize ...
Painting a blade black can dramatically reduce the number of birds killed by wind turbines by up to 70%. (Image Credit: May et al. ./Ecology and Evolution/Wiley Online Library)   The number of birds killed by wind turbines per year could be drastically reduced by painting one of the blades black.  In a new study conducted at a wind farm in Norway, Smøla, researchers discovered that changing the color of a blade from white to black reduces birth deaths by up to 70 percent.   ...
Northvolt’s factory, which is under construction, is set to be complete next year. The company is aiming to  (Image Credit: Northvolt)   European battery makers are getting ready to take advantage of huge “green” stimulus packages unveiled since the coronavirus pandemic. However, many recognize that it will be difficult to match the Asian battery giants that are currently dominating the mainstream market.   Companies like Sweden’s Northvolt and France&# ...
To create the material, the thin film is deposited via a pulsed-laser deposition process in the chamber. The bright plume represents the laser hitting the target and depositing the material. (Image Credit: Lane Martin, Berkeley Lab)   Even though capacitors are capable of rapidly storing and discharging electricity, they often have low energy densities compared to fuel cells or batteries. Supercaps and Ultracaps are a step in the right direction. However, researchers at the U.S. Department ...
A widely used and very popular battery tester in the maintenance sector is HIOKI's handheld BT3554. In less than three seconds it precisely measures the battery resistance at 1000 Hz as well as the battery voltage and it lets you make pass / fail comparisons based on freely defineable threshold values. Depending on the version this tester comes with test leads that are either straight or L-shaped. Alternatively there is a clip type test lead called HIOKI 9460 - this probe has a temperature senso ...
A research team has developed a method to turn common red bricks into an energy storage solution. (Image credit: University of Washington)   The growth of solar panels and wind turbine energy solutions may be great for renewable energy, but it poses a new problem: what do you do with the excess electricity? Some solutions include battery banks, fast-spinning flywheels, and underground vaults of air. One team of researchers has an unconventional solution that may work. All you need is a lot ...
The researchers successfully demonstrated the new zinc-air battery in the scorpion and worm toy robots. (Image Credit: University of Michigan)   Current stand-alone batteries are inefficient, too large, add significant mass to any robot design, and need a strong structure for support. Now, researchers at the University of Michigan have developed a new type of zinc-air battery that can be integrated into the robot’s structure. It also reduces weight and takes up less space in addition ...
Epishine is about to launch this interesting light energy harvesting (LEH) kit and has provided some early samples for evaluation.   Unboxing Here is an unboxing showing what might be expected in the kit:   LEH Kit Features Basically the LEH module is a light harvesting power supply that can deliver up to 20 mA and be set to output any one of 16 voltages in 0.1 V increments between 1.8V and 3.3V. The challenge for any solar power system is to convert variable low voltage and h ...
Researchers could make the conversion from solar energy to hydrogen fuel more efficient by using the machinery of photosynthesis. (Image Credit: Clay Banks, Unsplash)   Scientists from the Israel Institute of Technology have achieved record efficiency for solar-to-fuel conversion. Now, the team wants to integrate a photosynthesis device into the process to produce more efficient results. The team presented their findings at the American Chemical Society (ACS) Fall 2020 Virtual Meeting & ...
I'm selected for the STM32H7B3I-DK -  DISCOVERY KIT road test. I'm working on a touch screen GUI for my electronic load. In this post I'm trying a mock interface - see how I can switch between screens Thank you fellow roadtester jomoenginer for sending me a very good starting project.   image source: the mockup running in simulator mode on my laptop   Goal: Build an app with two screens, display data and info  I'm putting some light goals here. I've already checked oth ...