Questions tagged [low-power]

Low-power refers to electronics that are designed to use less power than their common counterparts. This is often a requirement because of limited available power, as in battery operated devices, or in cases with limited cooling capabilities, as in notebooks.

84 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
3
votes
1answer
275 views

Ultra low power audio recorder

I'm trying to design an ultra low power audio recorder, in order to monitor ground noise in rural areas. The circuit I'm working on is based on a microcontroller (STM32L100RC) and an audio codec (...
2
votes
0answers
49 views

Discharge protection circuit for 2S Li-ion

I'm looking for a overdischarge protection circuit for two 18650 in series. Preferably not a module. Discharge current is max 1mA. Charging is done in a separate charger My situation is a circuit ...
2
votes
0answers
92 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 ...
2
votes
0answers
70 views

Ultra low power battery

I am currently in the middle of a project and I am quite unsure of what type of battery and battery charger I should be using. To be honest I have never worked with battery or battery charger yet. In ...
2
votes
0answers
192 views

Low power circuit design

I want to design a low power circuit with stm32l micro and LoRa Module as its radio to send a sensor data to a gateway. The circuit is powered with a non rechargeable battery. My problem is about its ...
2
votes
0answers
575 views

USART on STM32F411 reads junk after MCU wakes up from STOP mode

I am working on a board that uses an STM32F411 connected to a bluetooth module over USART. One of the goals is to enable Low-power consumption in STOP mode. A brief summary of the platform: The ...
2
votes
0answers
128 views

Lowest energy wireless protocol for specific wireless sensor node

There are so many options for low-power wireless communication these days. BLE is everywhere, and many other manufacturers try to push their protocols as well. LoRa, Dust, Zigbee, Thread, Sigfox, etc.,...
2
votes
0answers
108 views

Low Current Consuption on a Voltage Inverter

I'm working with a uC and a Bluetooth Module. I need the lowest current consumption in this project because it is intended to be a mobile device. Thus, I'm using sleep modes on the uC. Now, I've ...
2
votes
1answer
191 views

RF limiter for -20dbm

I am working on a receiver in which I would like to limit the RF power at input to -10dBm to -20dBm, the receiver is working for frequency 1GHz. I Have checked pin diode limiters and shottkey diode ...
2
votes
1answer
322 views

Bipolar energy harvesting circuit

I'm planning an energy harvesting circuit using LTC3105 (400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up). The problem is that my energy source is bipolar, although ...
2
votes
1answer
565 views

Shut down circuit sections

I am currently devising ways to shut off different circuit sections in an embedded circuit. Here is a breakdown of what I am doing and my initial idea. Currently I have a micro controller which is ...
1
vote
0answers
50 views

Powering crystal oscillator (not the uc's one) using one of microcontroller pins for power saving

I want to design a low power RF link using SI4463 and I just need to send data but when I was searching for a crystal oscillator found out that most of them consume about 2-5 mA current. Is it ...
1
vote
1answer
54 views

Electrical calculation

I'm need to calculate the how long it will take to charge a battery using a solar cell. I am not taking any charge curves into account, I just want to get a close answer before I run the experiment. I ...
1
vote
2answers
56 views

Low Power Switching application With N-Mosfet

In my application I need to effectively switch on or off a very small load, around 0.5W to 1W. Also, I need to ensure that power loss is kept to a minimum. The voltage levels of my application will ...
1
vote
0answers
58 views

Ultra low power but also wake on event?

I have a nodemcu that needs to turn on periodically (every 2 hours) to take measurements, send them to me and then go back to sleep. I need this to be able to last for at least a year on batteries, ...
1
vote
1answer
58 views

Strange STM32L476RG GPIO behaviour when leaving STOP mode 2. Is it a silicon bug?

Before I enter the stop mode 2 I save all the GPIO MODER, OSPEEDR and PUDPR registers, configure pins as analogue (to save some power) and enter the STOP mode 2. When I exit the stop mode (I use RTC ...
1
vote
0answers
69 views

Measure low AC Power consumption (oscilloscope? MCU?)

I would like to measure AC power consumption of devices such as AC/DC charger, AC LED bulb or an electric circuit in the main box of a house. However, their power consumption are quite low and the ...
1
vote
0answers
54 views

Help required to design a suitable energy harvester for TENG

So I am in the process of desgining a scalable Triboelectric Nanogenerator(TENG) through which I can easily harvest and store electricity in a battery or a capacitor. A TENG can be modelled as voltage ...
1
vote
0answers
71 views

Make a double-tapping button (ideally without ICs or keeping ICs to a minimum) for a small “tiny cell” powered device

Conditions: small device, extremely space constrained (large caps are a no-go) Powered by a small battery (something like under 120 mah) Thus, adding a few more ICs like the 555 or "TimeBlox ...
1
vote
0answers
417 views

Controlling Wemos D1 power with N-Channel MOSFET

I am trying to implement something similar to this: https://youtu.be/nbMfb0dIvYc?t=4m27s Basically, the idea is that the microcontroller (a Wemos D1 Mini in my case) is powered up by an external ...
1
vote
0answers
52 views

Running following circuit in under 18mA and 15-20V.

So i build above circuit to drive a high frequency transformer that have Primary 10 Turns, Feedback 8 Turns, and Secondary winding of 1350 turns.It works great for my application with 7V input and ...
1
vote
2answers
130 views

Energy harvesting circuit output inquiry

I am doing an energy harvesting circuit experiment (LTC3108 IC chip). There was an example in the LTspice program. I observed the current of Vout and it was 99nA as follows. The voltage was found to ...
1
vote
1answer
169 views

Pico-itx motherboard Powered With Battery

I want to built a portable pc system. I am interested in the Pico511 pico-itx motherboard. My concern is how to run a system like this on battery. It's using 12V and for the top configuration it ...
1
vote
0answers
1k views

Use 2 RTC Alarm on STM32L073RZ

I'm trying to configure two different alarms on my STM32L073RZ with the given example by StMicroelectronics. The problem is, when I try something like the script below, only the first Alarm turned on ...
1
vote
0answers
150 views

Latch-up and ESD protection for power supply and RS-422

I am designing a power supply board that has a switching regulator and four LDOs. Now, I understand that layout details or practices will help reduce switching noise from corrupting the ground and so ...
1
vote
0answers
4k views

STM32F030 RTC wakeup from stop mode

I'm writing an app, that most of its time will spend in STOP or STANDBY mode (battery powered microsystem). I'd like the internal RTC to wakeup my STM32 every 5 minutes, enter the ISR, do its tasks in ...
1
vote
1answer
76 views

psIsolation Transformer DC 12 volts

I want to use 12 volts DC and step it up to 400 volts AC or higher at 100khz. I am buiding a signal generator that outputs a sine wave or square wave with an adjustable frequency of up to 100 kHz. I ...
0
votes
0answers
25 views

UPF for low power design

I want to write simple UPF for doing power supply connection for the design. I have top level design (eg name TOP) having 6 different power supplies.I am not sure while defining domain how to use '...
0
votes
2answers
41 views

Measuring nano amp range current consumption

I am looking to buy one of Joulescope, ZS-2102-A (angler circuits) or Otii (QOITech) to measure power consumption and get graphs of current consumption for some low power BLE/WIFI devices. Does any ...
0
votes
0answers
37 views

SAMD21G18 not working at 1.8V

I am working with a SAMD21G18 and a custom board based on Sparkfun design and I am using VSC + PlatformIO. Actually I want to run at 1.8V instead of 3.3V. Now, the hardware works well at 3.3V but ...
0
votes
0answers
27 views

Calculating power consumption of a digital temperature sensor

I want to calculate how much power does the TMP101 (https://media.ncd.io/sites/2/20170721134403/tmp101.pdf) consumes when it's operating. In the datasheet states the quiescent current in 3 cases: ...
0
votes
0answers
30 views

ATmega168 versions for low power applications

I am interested in using an ATmega168 for a simple application, which has however very strict power limitations. As a result, the important thing for me is to find the version with the least power ...
0
votes
0answers
39 views

What is wrong with my USB Li-Ion charging circuit?

I'm trying to design my own PCB based off of this one: My relevant schematics are here: Their Q3 transistor DMG3415U-7 was going obsolete, so I used DMP2045U-7, which seemed to be a similar ...
0
votes
0answers
17 views

Using an NO switch to close to ground as an interrupt

I'm designing a circuit that supplies power via USB to an Arudino. The USB power runs through a 3v3/5v dual regulator. I'd like to use a small tactile switch in front of the IN lead on the regulator ...
0
votes
0answers
9 views

Bluetooth Advertisements with multiple PHYs?

One thing I am confused about on Bluetooth 5. There are several different PHYs available on Bluetooth 5. My question is, can devices listen and/or send advertisements with multiple PHYs? What is ...
0
votes
0answers
27 views

Low power LiPo cell ADC with an nMOS switch and a resistor or capacitor divider circuit?

This is my first question on this platform and am looking for advice on doing a very low power LiPo battery measurement for a wearable device. My current circuit looks like this: (See image below) ...
0
votes
0answers
43 views

Utilising patchy DC to charge a battery (from generator)

I am currently studying first year engineering at my college and would like some help with energy storage. Note that this is an industry project and not homework, so I am not breaking any rules. My ...
0
votes
0answers
32 views

Estimating power consumption of GDDR5 chip from data sheet

I am trying to better understand the power consumption of this 8Gb Micron GDDR5 chip. Specifically, I want to estimate the following: idle—What is the power consumption when the chip is idling? max ...
0
votes
0answers
26 views

Alternate topping up two capacitor banks

I've implemented a Beam robotics 'solar engine' as detailed in the diagram below This engine takes a small trickle charge from the solar panel, before discharging the capacitor in one pulse of power. ...
0
votes
0answers
54 views

Latching relays connected in parallel not working as expected

I have a project I'm working on where I need 4 relays to open when power is applied to the board and close when power is lost. I need to use latching relays to conserve power as the device could be ...
0
votes
0answers
84 views

Measuring micro-amps with INA series

I'm designing BLE devices and other low power embedded systems that can consume very low energy in the range of a few micro-amps. I can't afford any expensive precision multimeters. Hence, I'm trying ...
0
votes
0answers
35 views

Piezoelectric Energy Harvesting & rectifying

I am interested in doing piezo energy harvesting. I have bought two of these piezoelectric Harvesters. One device I found, the ΒQ25570 seems to implement mppt (maximum Power point tracking), and be ...
0
votes
0answers
31 views

Total Power Cutoff circuit

I'm designing a battery controlled circuit using a 555 timer to control a mosfet to provide power to a load. The problem I'm trying to solve is to reduce the current draw while the circuit is not ...
0
votes
0answers
96 views

Shutdown mode on stm32 consuming a lot of power

I am testing the demo code given in the directory STM32Cube\Repository\STM32Cube_FW_L4_V1.14.0\Projects\NUCLEO-L476RG\Examples\PWR for CubeMX. I am testing the code PWR_ModesSelection and am recording ...
0
votes
0answers
29 views

Power management switch for Low-Power Application

In my low-power application I have a MCU waiting for an interrupt to wake up. (see picture) There are two sensor ICs (IC1, IC2) which consume very little and wake up the MCU via the interrupts. After ...
0
votes
0answers
27 views

Full charged battery age

I design a schematic for a alarm device. I use a trigger IC use 40nA and i want to use a 2500 mAh Li-Ion battery. The device is used at outdoor (-20/60 C) at least 2 year. I want to ask that a fully ...
0
votes
0answers
55 views

Looking for advice - DIY data transmission over DC power lines

Want to drive DC motor and read some data through one pair of wires. Modified and made a simulation of transciever based on this one: https://www.radiolocman.com/shem/schematics.html?di=148255. ...
0
votes
0answers
33 views

Travel Photography 3.5V 3,6-4,8A LED Lamp powered by power bank

I travel a lot for my work as a photographer. For this I'm building a custom full spectrum lamp. I have no issue running my build with a normal adjustable power supply from my studio. To be able to ...
0
votes
0answers
36 views

Low power, low profile binary indicator

I am looking to find a way to communicate an alarm on a tiny device with a very low profile low power consumption component. The alarm is binary in nature, basically it is either on or off. LED does ...
0
votes
0answers
19 views

Indicating “image not displayed” from downstream via DP/HDMI/DVI

I'm trying to switch a video signal between different sources and, as a courtesy to the device generating the signal, would like to indicate that the image data is currently being thrown away so it ...