Questions tagged [power-management]

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23 views

How to connect old and new BMS together on 10S5P Lithium Ion powerpack

I have configured 10S5P lithium power pack, because the old lithium batteries had almost no capacity. So I am having the following problem, the old BMS is a 8S BMS, because I have configured 10S ...
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1answer
33 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 ...
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1answer
52 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 ...
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42 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 ...
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1answer
39 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 ...
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76 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 ...
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1answer
61 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 ...
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2answers
2k 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 ...
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93 views

How should I implement a USB-C Power Mux Circuit with Enable?

I'm designing a device which can be powered by DC IN or USB-C. The USB-C is a DRP, so it may be tasked either with sinking or sourcing power. The DC IN may be between 5V and 20V, so from here I'll ...
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46 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 ...
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2answers
108 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,...
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110 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, ...
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78 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 ...
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1answer
649 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 ...
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75 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 ...
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2answers
73 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 ...
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78 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 ...
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1answer
382 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 ...
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45 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. ...
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1answer
48 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 ...
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60 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. ...
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1answer
68 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 ...
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1answer
63 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 ...
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2answers
3k 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 ...
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2answers
137 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 ...
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2answers
506 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 ...
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50 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), ...
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2answers
66 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 ...
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0answers
94 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 ...
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1answer
64 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 (...
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2answers
98 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 ...
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51 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/...
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3answers
119 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 ...
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2answers
482 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 ...