Questions tagged [power-consumption]

Power consumption is the actual energy demand made on existing power supply (e.g. battery). Consumption of electric energy is measured in watt-hours, Wh.

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3
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2answers
130 views

How do ASIC designers approach designing for extremely low supply voltages like 0.3V?

In ASIC design, there is a tradeoff between performance and energy efficiency. Since most consumer CPU's are designed for maximum performance, they operate at high voltages and clock frequencies, ...
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0answers
45 views

ATMEGA1284p and RFM95 sleep current around 35µA: can it be reduced further?

In my project, I am using an ATMEGA1284p processor in the TQFP-44_10.0x10.0x0.8P package as well as a RFM95 LoRa module. For the low-power mode, I'm using the rocket scream low-power library: https://...
-4
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3answers
141 views

Why don't GPS satellites experience power outage more often than they should?

With the advent of smartphones I would believe that there's this huge exponential growth in number of GPS receivers around, and by now there should be an unaccountable number of devices on earth ...
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1answer
106 views

Could a PC consume more power from the plug if it oparates in a colder enviroment?

I have a mining rig (computer using its processing power to calculate hashes in order to eventually be rewarded with cryptocurrency tokens.) The program I use to mine tells me each time the power ...
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2answers
44 views

How to reduce power in barebone setup of atmega328p?

For every 15 minutes once ultrasonic sensor data will be send to the receiver using nRF24L01. I'm using atmega328P with battery power using AAA*3 battery and it should operate at least 15 days. Can ...
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0answers
79 views

Leakage current through push-button and switch

I am developing a battery-powered application on a custom PCB, thus power consumption is critical. I am trying to minimize current consumption with stm32L4 MCU, by turning floating pins to analog, ...
2
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1answer
47 views

Power efficiency with Boost vs Buck-Boost using same regulator

I'm doing a few tests and figuring out what will be the best option for what will eventually be part of a battery powered circuit. I have both a boost and buck-boost converter, both using the XLSEMI ...
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2answers
64 views

3.7V to 7.5V step up circuit

I need a circuit which can step up the voltage from my 3.7V Li Ion battery to 7.5V. The current requirements are pretty small (up to 50mA max), but I have a latching solenoid which requires a short 7....
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1answer
30 views

MC34063A power consumption calculation

I'm designing a circuit based on the MC34063A switching regulator to step up 3.7V to 8V. The 3.7V for Vin comes from a 3.7V Li Ion battery and so I'm trying to calculate the battery life. I'm a bit ...
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0answers
40 views

Do electricity distribution companies charge apparent power (VA) or effective power (W) [duplicate]

If there is a load connected to a power outlet during one hour, where average apparent power is 1000VA and average effective power is 800W, what will be charged by the eletricity distribution company? ...
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3answers
274 views

What happens with the power grid if nobody uses electricity?

How much electricity does consume electric system by itself? Just to have an option at any moment to plug in anything at socket at home and turn it on. There are huge power plants to convert high ...
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2answers
83 views

Correct way to measure circuit power consumption before or after LDO

I have created a low power MCU project, and I want to measure the power consumption. I am confused with: a) the correct way to place the ammeter, before (picture A) or after (picture B) my voltage ...
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2answers
42 views

Microwave “power” vs “power consumption” [closed]

I'm looking at the specs for this microwave and it lists Power -> Microwave as 1,100 W, but then lower down it lists ...
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0answers
52 views

High Power BJT Current mirror

I am trying to find an example of BJT current mirror with high power consumption. Any advice concerning the setup , or an example design will be appreciated.
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1answer
53 views

STM32L0 series current consumption oscillation

I'm working on a low power project that my micro-controller can only have 1 mA in 2.7 V. My micro-controller is STM32L051C8 and its works nice with its peripherals (ADC and Timer) and its current ...
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1answer
65 views

CP2102 using excess current

I am powering an off-grid ESP32 project from a 12v battery (12v because that's what the connected pump and solenoids use). The ESP32 is directly on PCB; I'm no longer using Dev Kits. I'm needing a ...
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0answers
32 views

How to measure power consumption of Arduino Uno onboard ADC module?

For a project, I am using Arduino Uno onboard SAR ADC module. I want to calculate the power consumption by the ADC module. The way I am thinking to calculate it is AVCC*ICC. Here, AVCC is the supply ...
2
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2answers
81 views

PWM output vs Digital output

Could I use a PWM output as a digital output? For example to act like an on-off signal by varying the duty cycle between 0 and 100%. Does it involve any difference in power consumption?
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1answer
109 views

433 MHz receiver consumes too much power

I bought one of this modules (link), with the SYN470 chip on it. In the datasheet it's mentioned that in continuous mode with 433 MHz the current consumption is 3.9 mA which is a lot in my case. But ...
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1answer
101 views

What is the best way to measure and record the power consumption of a servo motor accurately?

I can obtain the rotational angle and velocity of a servo motor. However, I cannot obtain the current nor torque while the motor is turning. What is the best way to measure the power consumption of a ...
0
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1answer
41 views

What is the max current consumption on bus side of isolated RS485?

application - 10 nodes 1 meter apart 120 Ohm terminating resistors at last node and 1st node i hope to use ADM2486 data rate 10-17Mbps vdd1 5V and isolated vdd2 5V what is the max current consumption ...
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0answers
250 views

ESP32 High Power Consumption in Deep Sleep Mode

I'm running a Python program on an ESP32 (MicroPython firmware) that fetches online data to save it locally every 5 hours, and then goes into deep sleep mode. The board is powered with a 3.7V lipo ...
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0answers
23 views

Restarting ESP8266 NodeMCU in DeepSleep with a signal from HM10 BLE

I'm building a simple project in which I put the ESP8266 NodeMCU board in DeepSleep mode, so I can save some battery since it's powered with 4 AA batteries. What's the problem? I don't want my ESP to ...
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2answers
256 views

How to calculate the current / power consumption of instrumentation amp with op amp as an impedance converter at REF input

I have a measuring bridge and want to connect it to an ADC with an AD8227 instrumentation amplifier (Datasheet). For the reference voltage, I have connected a voltage divider to an LP358 as an ...
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2answers
78 views

Meter reading is not equal to the actual consumption calculated from the wattage of the equipments [duplicate]

Today I have the checked the meter. It was showing 0.650 kW (instantaneous power) while just four appliances were running. i.e two ceiling fans of 60 W each and two refrigerators of 150 W and 180 W ...
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1answer
63 views

Correct way to measure power consumption in AC

Just in case: Sorry for the bad English. I'm trying to do a power consumption data logger. But I don't understand the calc behind this. I got more confused reseaching on internet. Firts, there is ...
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0answers
24 views

Motor consumption with 1V vs 3V w/ 90% PWM

Using a DC motor, I can reach about 1200rpm using 1V/1A (laboratory style power supply) However, if I use 3V input and a PWMized MOSFET, I need a duty cycle of about 90% to reach the same rpms and the ...
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1answer
76 views

Energy consumption of mathematical operations

Are there any general estimates of the (relative) power consumption of mathematical operations in electronic circuits? Surely, this is chip-dependent, but for example, ...
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1answer
109 views

Electrical water fountain - what is its power consumption? [closed]

Above is the image of the electrical water fountain given to me by my ex-employer, on account of my birthday. The single LED changes its colour (Red, Green, Blue) every two seconds. It is operated by ...
0
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1answer
41 views

Actual power consumption of a smartphone charger

When I search on the Internet "How much power does a smartphone charger consume?" it shows "3-7W". I know Power = Voltage x Current. Based on the equation and the input ratings (...
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1answer
146 views

Microcontroller Current Consumption when different internal and external clock modules are used simultaneously

I am using this Microcontroller - S32K142 64 pin. From the Figure 4 in this Application Note, We can see there are 4 clock sources for the Microcontroller. FIRC - 48MHz SIRC - 8MHz SOSC - 4-40MHz LPO -...
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1answer
70 views

Calculate lifespan of BLE ESP-32 module

I have purchased an ESP-32 BLE module. I have programmed it to turn on to broadcast a Bluetooth text to my phone and then enter the deep sleep mode. Then continue this loop. When the Bluetooth text ...
0
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1answer
35 views

Basic Power Consumption - Continually leave AC on vs Occasional start/stop

Question If my goal is to keep my energy consumption at a minimum should I power my AC off once the room is cool or leave it running in its sort of stand-by state (fan still running)? I'm not sure of ...
1
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1answer
80 views

Power Consumpion on i2c on esp32 on arduino framework

I am relatively inexperienced with electronics so be gentle please. I am trying to interface a VEML7700 photodiode sensor with a Firebeetle ESP32 using platform.io and arduino framework. The ...
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1answer
70 views

What is the most power hungry component of a air conditioner?

Im taking about those old school air conditioners, which draw around 1200 watts from the wall.
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1answer
64 views

Real consumption of SMD5050 Led Strips

I'm building my home lights with an SMD5050 Led strips. And I'm completely lost after comparing specs consumptions with real measured data. So on, I have 5 stripes and 1-to-5 Splitter from my ...
2
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0answers
57 views

DDR4 Refresh VPP Power Consumption

My question may seem stupid but for a REFRESH operation on a single-rank DDR4 with multiple DRAM devices, how to properly estimate the DRAM power consumption ? I tried to use Micron Power Calculator ...
2
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1answer
212 views

Calculating power consumption in portable air conditioning unit

Apologies for this likely very simple/stupid question. I have a portable AC (air conditioning) unit that's supposed to be "energy efficient". On the back of the unit, it tells me some details about ...
1
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1answer
346 views

nRF52 GPIO configuration in sleep mode to prevent peripherals from drawing current

I have a battery-powered board with an nRF52832 and some peripherals that I am writing a new firmware for. When set to sleep (NRF_POWER->SYSTEMOFF=1;) the board still draws way too much current (...
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2answers
38 views

What is the appropriate unit for measuring power consumption by a section of code?

I am wanting to measure the energy consumption of running some intensive blocks of code on Android, but I am very shakey with my electricity knowledge, so I am unsure what measurements I should be ...
2
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2answers
54 views

Is microcontroller power consumption directly related to its operation time?

I have to decide on a way to measure the efficiency of an algorithm running on a microcontroller/microprocessor. My thought is that I can use the runtime of the algorithm to complete a certain task ...
0
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1answer
61 views

Why is this device power usage so much power and with such variation?

I just got a wattage meter to try to get a sense of where my electricity usage is going. One of the surprises was my cheap drugstore humidifier, which seems to be drawing 640 watts. I have a huge ...
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0answers
212 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: ...
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1answer
265 views

How to calculate check practically POWER of SMPS required for desktop computer

How to calculate check practically POWER of SMPS required for desktop computers I have 10 desktop pc in one PC i have a high end gaming gigabyte motherboard with AMD processor graphic card and ...
4
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1answer
553 views

Do dead CFL or LED light bulbs consume power and is it safe to leave them mounted?

Do burned-out CFL or LED light bulbs consume power when the switch is on? Is it safer to keep them in their sockets, removed or slightly unscrewed so the bottom center contact isn't touching? I ...
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0answers
46 views

IC power consumption under 50% vs 100% busload

Is the dynamic power consumption difference significant for a uC, if it has to raise its activity on the chosen bus protocol from, lets say 50% to 100%? I look in overall to the uC+CommController+...
0
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3answers
87 views

What consumes the most power in a computer

I have a quite basic question: As far as I understand (correct me if I am wrong), we can summarize a computer by saying it is composed of wiring, transistors and some electronic components like ...
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1answer
146 views

Calculating power consumption of optocoupler

I am having trouble calculating the power consumption of this optocoupler (4n25). In the datasheet the input power dissipation stated as \$ P_{diss} = 100mW \$ and forward current of \$I_F = 60mA\$. ...
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2answers
793 views

When to factor duty cycle into power consumption calculations?

This is probably a simple question for most of you. I am calculating the power consumption of a device. The load is driven using a square PWM signal. At what point do I factor in the duty cycle? For ...
11
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4answers
2k views

Can we reduce power consumption of digital interfaces by using high impedance transmission lines?

Transmission lines must be terminated with the same impedance as the transmission line has itself to get an impedance matching and avoid reflections at a high impedance end point. This termination ...

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