Skip to main content

Questions tagged [power-management]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1 vote
1 answer
75 views

Why the peripheral devices won't completely power off

I'm working on a project that requires efficient power management, specifically the ability to shut off power to some peripheral circuits to save energy. My setup involves using a TPS65261 triple ...
Mingqiang's user avatar
0 votes
1 answer
72 views

Programmable current-limit/e-fuse (+current monitoring?)

Short version: How best to make either a current limiting circuit or an e-fuse (both options are fine to me) so that I can set the limit from software (and not through a fixed resistor as usual)? ...
Sandro's user avatar
  • 7,367
0 votes
1 answer
83 views

Power management for components on a PCB

I’m a begineer in PCB designing and I'm designing a circuit where I have 4 ICs connected in parallel. I have used JW5068A IC which have output voltage of 5 V and max current of 8 A for whole circuit. ...
Lalith Gv's user avatar
1 vote
1 answer
358 views

Trying to understand IP5306 battery manager

The manufacturers datasheet of the IP5306 Battery manager IC doesn't explicitly explain how the charger works. I would like to know from which pin of the IC goes out the current to charge the battery ...
Lahcene Akrour's user avatar
2 votes
3 answers
257 views

What is an efficient way for distributing equal power to multiple audio amps?

I'm working on an audio system prototype that requires cables passing through active speakers in series. As cables will have different lengths, I'm counting on voltage drops along the way. Is there an ...
Emerson's user avatar
  • 413
0 votes
2 answers
189 views

Over voltage and backflow protection

I'm drawing up a MCU based device for my bike to control light etc. The power comes from the dynamo, and at higher speeds it will produce a lot more voltage than the circuit can handle, so protection ...
MiNiMe's user avatar
  • 1,609
10 votes
4 answers
1k views

How can overproduction of electric power be a problem to the grid? [closed]

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 ...
Sieg Novak's user avatar
0 votes
1 answer
60 views

Gate-source connected MOSFETs for voltage division

Currently, I am engaged in the design of a Thermal Shutdown circuit for an LDO regulator. In this endeavor, I have obtained a circuit schematic from a senior colleague, which utilizes three NMOS ...
Arnab Deb's user avatar
0 votes
0 answers
73 views

Powering a microcontroller during sleep periods

In general, what is the best practice for powering a battery-powered uC during its sleep periods? I have a uC driven system that does a bunch of stuff for perhaps 10% of the time, and spends the rest ...
Paul Blase's user avatar
1 vote
1 answer
130 views

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 ...
fKelectronicR's user avatar
0 votes
0 answers
50 views

Supplementing USB power with batteries

I am designing a custom USB hub for a project that will be primarily connected to a Surface Pro or laptop. One of the peripherals that I am using is a camera that consumes quite a bit of power from ...
Rp Wav's user avatar
  • 11
1 vote
1 answer
124 views

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 ...
torosluadam's user avatar
0 votes
1 answer
38 views

How to integrate action variables of logic type into the split range control structure?

I have following control task. I have to limit a current drawn from a source of power in a grid where I have following power consumptions: battery charger variable frequency drive aux power ...
Steve's user avatar
  • 1,103
0 votes
2 answers
183 views

Dynamic Power Path Management (DPPM): Why does the output voltage drops when the current exceeds the adapter's limit?

In Section 2.5 of Battery Power Management for Portable Devices, by Yevgen Barsukov, the author explains the Dynamic Power Path Management (DPPM) found in battery chargers. Figure below describes the ...
Luiz Gustavo Martins's user avatar
0 votes
1 answer
97 views

Ceramic capacitor capacity vs electrolytic

I'm an electronic tech so I've got some background but not so much as an EE. I work at a CM diagnosing boards to the component level where possible. I have a bunch of boards that are malfunctioning. ...
Katherine's user avatar
1 vote
2 answers
167 views

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 ...
kodi's user avatar
  • 75
2 votes
1 answer
360 views

USB Power Inside of Freezer / Fridge [closed]

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 ...
MrJustin's user avatar
  • 123
0 votes
1 answer
321 views

Adjustable LDO's - Voltage Input, Output, & Potentiometer Use

I am looking to use an LDO with a negative adjustable output voltage. I have found two products sold by TI that have similar schemes for setting the output through external resistors. I am slightly ...
Cole Fehr's user avatar
0 votes
1 answer
39 views

UC3907DW which pins are the two batteries?

I have a project and want to power it from smart phone power banks. Now 2.1 ampere at 5 volt is not enough to power a motor. I want to combine multiple power banks (4) to provide enough current and ...
Barny's user avatar
  • 3
1 vote
1 answer
121 views

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 ...
mguzman's user avatar
  • 13
0 votes
0 answers
45 views

How to make an undervoltage trip switch?

I want to make a switch which permanently cuts a power supply to a microcontroller when the supply voltage drops below a certain level. I am powering an ESP32 development board from two 3.7V 18650 ...
Jason Daniel's user avatar
2 votes
1 answer
55 views

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 ...
Suze1990's user avatar
  • 101
1 vote
0 answers
591 views

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 ...
Omer G's user avatar
  • 11
3 votes
1 answer
577 views

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 ...
David Matias's user avatar
5 votes
2 answers
25k views

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 ...
James Barnett's user avatar
0 votes
0 answers
295 views

Simultaneous charging and powering device for DIY project (12v)

I'm planning to build a DIY Raspberry Pi tablet powered by three 18650 li-ion cells. I want to be able to use the device and charge the batteries at the same time, like it's common for tablets. Here ...
bug.spencor's user avatar
0 votes
2 answers
117 views

PCB design, where to start? [closed]

I am working on a project that requires a power management board. I use a solar panel (or a wind turbine,) a battery and a Raspberry Pi that uses a 4G hat. I need a board that manages the power source,...
Romk's user avatar
  • 1
1 vote
0 answers
634 views

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, ...
Manish's user avatar
  • 29
1 vote
0 answers
233 views

Setting register values over i2c from Linux (managing power on a PocketCHIP)

TL;DR - I need to set the contents of a register on a power management IC over I2C from Linux running on an SBC. I've found the datasheet for the IC, but I don't know how to use the information in it ...
Henry Cooke's user avatar
1 vote
1 answer
3k views

how to calculate hysteresis resistor value TL431

I'm creating a small ESP32 based robot controller board. Partially as a self learning experience (mech engineer, self taught on eletrical front but this is for hobby use :P) and partially because it ...
D Mason's user avatar
  • 21
2 votes
0 answers
144 views

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 ...
David Black's user avatar
0 votes
2 answers
170 views

Power switch in electronics in Europe

Are there any requirements towards user electronics working in Europe stating that they need to have on/off switches? I am asking especially regarding networked devices. I have seen a lot of unmanaged ...
Łukasz Przeniosło's user avatar
1 vote
0 answers
112 views

space constrained, cost constrained; super capacitor UPS decision paralysis

I am currently in the process of evaluation of options regarding Super capacitor UPS designs. The requirements are simple, find the most effective solution to keep alive 5V supply line for ~20 ...
JacobV's user avatar
  • 171
0 votes
1 answer
1k views

Reverse Voltage Protection the same as Reverse Current Blocking?

I have been searching for an power management IC for my circuit but i noticed that Reverse Voltage Protection and Reverse Current Blocking are both a separate feature. Logically speaking i think they ...
DrakeJest's user avatar
  • 897
0 votes
0 answers
83 views

Multiple voltage level on multiple rail using ORing PMIC

I have two voltage rail that i would like to have 4 different voltage levels 0v, 5v, V1, V2. where V1 and V2 are anywhere from 6v to 60v. The two voltage rail can have any of the voltage at any time. ...
Jake quin's user avatar
  • 1,924
0 votes
1 answer
57 views

What make TEA18362T by NXP to work upto 75W?

I am planning to develop SMPS for 24V-4A using TEA18362T, but according to datasheet it useful up to 75W output power. Even online design tool by NXP works up to 75W. Is it possible to design and get ...
Dhaval Lalani's user avatar
1 vote
0 answers
79 views

Battery management for 12-24V motors

We have 4 12-24V motors which we want to connect to a 14,8V battery. Two of the motors are position controlled (M3 and M4, see figure) and will not draw much current as they will mainly be stationary. ...
bjornsing's user avatar
  • 163
2 votes
1 answer
116 views

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 ...
Gercer's user avatar
  • 21
0 votes
1 answer
230 views

Pros and cons of a output discharge of a power distribution switch

I am looking at a current limited output switch tps2061 and some variation of this part has a output discharge. Based on the datasheet page 16 this discharges the circuit when disabled or in UVLO. I ...
Jake quin's user avatar
  • 1,924
1 vote
2 answers
6k views

Is it possible to only fill a Li-ion BMS partially?

I'm putting together an 18650 battery pack for an e-bike. The BMS is specified for 10s 36v 40a. Is it possible to use the BMS with only, say, 2 or 3 of the 36v packs of cells I made? The use case ...
FallenSpaces's user avatar
0 votes
2 answers
379 views

Looking for a button-controlled on/off PMIC akin to those in laptops [closed]

I'm designing a circuit for a custom event console (SMPS', chip reader, screen, controllers, NFC,..) which I would like to power on/off in the same way a laptop or tablet is powered on/off (hold ...
Alex Er's user avatar
  • 111
0 votes
2 answers
773 views

Do I need a full BMS or just protection circuit?

I'm planning on building a custom battery powered speaker, and am quite new to rechargeable batteries. My amplifier needs 5V, so I thought I would put 2 18650 batteries in series, and use a step down ...
AWein's user avatar
  • 1
0 votes
0 answers
111 views

Power management controller with multiple inputs

I have planned a (quite complex) controller for a project based on a Raspberry Pi (web UI, logging, camera framegrabbing/video processing, LTE uplink), i2c sensors (assortment of environment sensors), ...
Skynet's user avatar
  • 101
1 vote
2 answers
136 views

Magnetic induction with varying rpm: Dealing with excess energy

I would like to get some advice regarding the following scenario: I want to build a cheap, small generator for an energy harvesting application. There are magnets on a rotating shaft and off-the-shelf ...
BendingBender's user avatar
2 votes
0 answers
98 views

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 ...
Tim Walther's user avatar
0 votes
1 answer
93 views

STM6600 voltage divider on VCC for high voltage applications

I'm evaluating the STM6600 on/off controller. My application has a 2-series LiPo battery with a voltage range of 6 to 8.4V, so I need to put a voltage divider before VCC as described in AN3271 (...
Genoil's user avatar
  • 258
0 votes
2 answers
163 views

Quiescent current on OFF/ON controller ICs seems high

I want to improve an existing OFF/ON circuit in a project I have. Why do most off/on controller ICs have such a high quiescent current (approx 6 uA)? Their sole purpose is to manage an off/on battery ...
instrumentek's user avatar
0 votes
1 answer
107 views

Is there a Energy Harvesting Power Management and Battery Charging EVM dev kit (e.g. BQ25504) with easily adjustable voltage thresholds?

I have a BQ25504EVM-674 Energy Harvesting Power Management with Battery Charging (EHM) development board by Texas Instruments. It fulfills my requirement of charging an energy store (e.g. supercap/...
bd3lk's user avatar
  • 63
2 votes
3 answers
130 views

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 ...
Mark's user avatar
  • 117
0 votes
2 answers
1k views

The single-power-button logic of the cell phone [closed]

As known the cell phone has a single power button (most if not all), long press of it can power on the phone or choose to turn off the phone in the UI (my phone is Samsung). I wonder how is it ...
diverger's user avatar
  • 5,866