Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [power-management]

46 questions
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How can overproduction of electric power be a problem to the grid?

Recently, in Brazil, we had a major shutdown of the electrical grid of the entire country (wich is mostly interconnected across the majority of the states). After official investigation, the culprit was determined to be the excessive production of…
Sieg Novak
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Is it safe to daisy chain extensions cords?

I recently set up a soldering station on my old desk in the corner of my room. However there are no power sockets near there so I had to daisy chain two extensions cords to deliver power to my solder station and fan. Is it a safe solution? I read…
James Barnett
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3
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1 answer

Choosing the right MOSFET and diode for DPPM (Dynamic Power Path Management)

I am trying to implement a DPPM (Dynamic Power Path Management) system that uses a main voltage when it is present and a battery when the main power is not present. The main voltage would be 12V and the battery would be a Li-ion (3.2-4.2V). The…
David Matias
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1 answer

USB Power Inside of Freezer / Fridge

Background of the project: I am doing my own DIY Keezer (keg freezer) which basically turns a chest freezer into a fridge that will hold kegs with the assistance of a temperature controller. The temperature controller plugs into the wall, the…
MrJustin
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Which Power Management Topology

This is a bit of an open question but I am seeking advice on further research and also some search terms so I can find the best solution. The project requires a 48V source from a battery pack which needs to be boosted to 600V-800VDC (allowing a…
Suze1990
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Supercapacitor as PMIC Storage Element

I'm currently trying to design a system that incorporates an ADP5092 which can use a supercapacitor as the storage element but I am also considering other similar PMIC chips so this is more for reference. In this application the load system will…
David Black
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Battery Management Controller

I designed a wearable with a 3.7V Li-Po battery (381018). Everything worked good at the begining and now after 6 months I realize some circuits are not charging anymore. For what I understood when I was doing a small research about this problem, I…
Gercer
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Powering down parts of a pcb to conserve power, is it possible? Any caveats?

I'm building a USB 2.0 bus-powered STM32F429-based audio device that is able to run in a stand-alone mode from a phone charger, or running as a USB device when connected to a computer. To comply with the USB spec, the device should not consume more…
Tim Walther
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Why system energy is equal to 1/f?

I am studying Intel speed shift. I see a slide: Reference I don't understand, why the green line 1/f means system energy, I think more performance should need more energy as the red line (compute energy). Original site: The Intel Skylake Mobile and…
Mark
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A circuit which charges and uses a lithium ion battery

I am designing a circuit which will utilise a lithium ion battery. The circuit would ideally be plugged into a power source the majority of the time, butI would also like it to be portable. I have been doing some research into battery charging and…
fKelectronicR
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How to connect in serial two 2S Battery pack but charge them seperately?

I want to create a circuit that has input 12V DC and uses this voltage both charging two 2S (7.4V Li-Ion without balancing wire with BMS Circuit on the pack) batteries and at the same time supplying energy to the load. When 12V DC is not connected…
torosluadam
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Can we power an LED from 330VDC power supply?

I'm wonder if I can power an LED from a 330V DC main power supply without loss of power in Joule effect in the resistors. (This is a challenge). Suppose we want 30mA and 5V in the LED and the reverse Zener voltage is 12V. simulate this circuit –…
kodi
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Why P-MOSFET is this way and not on the contrary?

I was reading this application note from Microchip (AN1149) and I can't figure it out why this P-channel MOSFET (Q1) is placed like this: I thought the parallel diode integrated with the MOSFET will allow battery voltage pass to the load, why it…
mguzman
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Does my PCIe platform support CLKREQ#?

I succeeded entering ASPM L1.1 and L1.2 for my device. After entering ASPM L1.1 or L1.2 and trying to initiate to exit from Host side, I saw some hosts that are: • Able to initiate an exit from ASPM L1.1 and L1.2 using CLKREQ# (Host side is pulling…
Omer G
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Working of -12V buck-boost supply using LM2576

I want to make a -12V supply and I came across a circuit using LM2576 that match my requirement but I am not confident enough about its working. There is a note in the datasheet page no-16, Application and implementation section saying: Information…
Manish
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