Questions tagged [power]

Where power is a primary concern for the design under discussion. Use the "low-power" tag when that applies.

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46 views

Three-phase rectifier for offline single-phase supplies

First thank you for the help. I'll try to explain my self for this problem and sorry in advance if I'm not very clear, english is not my native language. I'm making a universal PCB design involving ...
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1answer
61 views

Circuit design when using batteries [duplicate]

I'm new to making any electrical desings that don't have a manual. I have six 12 V 20 Ah Lead-Acid batteries connected in series. Can a 12 V 14 Ah or/and a 12 V 6.5 Ah battery(ies) be connected in ...
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1answer
66 views

How to select the right HV pulse capacitor?

I'm planning to discharge a 1500VDC 150uF~250uF capacitor into a coil 20 times per second. I've found a few capacitors that might do the work, but I have some questions about their charge/discharge ...
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1answer
61 views

Why will i calculate the wrong power ,but right loading resistance in this circuit?

The question wants me to calculate that what is the \$R_L\$ value when we ...
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1answer
32 views

How many routers can the Powerbank power and how long?

I have a power bank, Capacity: 27000mAh/99.9WH Input: 19V/1.6A AC output: 220V/50Hz 100w Max Router (MR600) Input: 100-240v 50/60hz 0.6A output 12v 1.5A
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28 views

Battery Protection IC With NTC Thermistor

I have a battery design which is failing EN 62368-1 for thermal cut-off on charging conditions. IE. at the maximum temperature, charging currents need to cut off at maximum temperature. I am looking ...
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32 views

How do I calculate the MOSFET losses from reading the datasheet?

I'm trying to figure out how to calculate my MOSFET (DATASHEET CLICK HERE) losses while following the guide below. However, I'm not really sure what values to use whilst calculating the Conduction ...
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1answer
41 views

High power heating element control

How to control high power (~5kW) heating element using MCU? I need a very simple application that shuts down the element, when it reaches set temperature. Maybe I can do it using SCR? F.e. Т161-160 (...
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2answers
104 views

How does this audio power amplifier circuit work?

How do I simulate an audio amplifier in Multisim? I'm required to search for audio power amplifier circuit and explain how it works in details so I need to know the detailed process of this circuit ...
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2answers
45 views

Softcore vs hardcore for power consumption

What is the difference between soft core and hard macro processors used in FPGAs in terms of power?
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1answer
67 views

I couldnt solve it. Someone would help me? [closed]

If someone share solution A and B I'd be appreciate...
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0answers
37 views

DC Motors Voltage Equation versus Power Equation

I understand the voltage equation and the power equation for DC motors. But somehow I have a problem understanding moving from one to the other. I am not interested in the IR or IdL/Dt so I will ...
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3answers
241 views

Mosfet controlled LED strip not bright enough

So, I'm trying to control a LED strip with a NodeMCU using N-MOSFETs FQP30N06L, one for each channel. However, the strip is not nearly as bright as with the original IR controller. (I saw the similar ...
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1answer
54 views

Battery charger vs Voltage or neither - They offer accurate power consumption? (mA)

I want to measure the power consumption not in theory but in time (after one day of use). I don't have equipment to measure the power consumption but I have a battery charger that reports mA charged ...
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3answers
71 views

How to Prevent CD4017 from Resetting to Random Count on Power On

I'm working on a project using a couple of CD4017 decade counter chips sharing a clock signal from a 555 oscillator. The ideal behavior I would expect is that the chips would all start on count 0 ...
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0answers
22 views

Variable Gain Amplifier (VGA) Cadence Simulation [duplicate]

I'm designing an Amplifier (VGA). I'm using Cadence CMOS 180nm technology. How can I find the power up time and power down time (1% of final current)?
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2answers
48 views

Calculating power emitted from electronics

I am trying to figure out how much "thermal noise" electronics may produce as I am trying to detect the cosmic microwave background radiation, but the electronics surrounding the detector will ...
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4answers
62 views

Do usb and vga controllers consume power if there are not devices connected to them?

Let's consider the following situation. There is a server, for example supermicro, that has 4 USB2 ports, 4 USB3 ports, and 2 VGA ports. At the same time we don't use these ports, I mean there are no ...
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26 views

USB power delivery and data transfer using type c

I have recently been designing a soldering station that uses Weller active tips and have become interested in using USB power delivery to power the station I have found the STUSB4500 which looks ...
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3answers
72 views

Complex Power: \$S = V \cdot I^*\$ OR \$S = \frac{V \cdot I^*}{2}\$. Which formula is correct?

Different examples and videos have shown that: $$P_{complex} = V \cdot I^*$$ However, my textbook shows: $$S = \frac{V \cdot I^*}{2}$$ My professor has even using \$S = V \cdot I^*\$ himself during ...
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64 views

Windmill 3 Phase AC control PCB

I've created a PCB for my newly built 3D printed Windmill. Now I am not entirely sure about all the components and the way they function, so I'd like to have your opinion on the circuitry before I ...
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1answer
21 views

How to choose a 50 Ohm RF attenuator for radio, bluetooth and wifi power measurements

I have built a power meter with AD8318, a chip which contains a logarithmic amplifier, often used for power measurements. I have read its datasheet and it is written that the maximum input power is ...
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0answers
19 views

Radiation pattern and propagation direction

I have a basic doubt about how to read a radiation pattern. Let's consider precisely the power pattern: it represents how the power is distributed along all directions in space. For instance, this ...
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0answers
67 views

Can I use only one phase out of a triphasic cable? [migrated]

Scenario There is a three-phase cable popping out of the wall exactly where I need to put a light bulb. Is it ok if I plug only two wires to the triphasic cable, (i.e. neutral and live 1) to achieve ...
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1answer
43 views

What is a good higher-voltage alternative to the TI TPS2113A power mux?

UPDATE: According to the TI datasheet, 6V is absolute max, so I guess I'm ok. Board: https://www.pololu.com/product/2596 Datasheet: http://www.ti.com/lit/ds/symlink/tps2113a.pdf NOTE: I'm looking ...
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2answers
56 views

shape and size of power plugs [closed]

What is the reason behind designing electronic devices with power cords that do not fit side by side on power boards or wall sockets. For example: all power boards that I've seen (for home/office ...
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0answers
115 views

PCB Critique: Soft-start power distribution from 24V battery

Design I'm designing a power supply to break out power from a 24V cordless battery that contains a 6s2p configuration of Samsung INR18650-20R cells (datasheet, pdf), each capable of 40A pulse and ...
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1answer
63 views

Boost Converter - How the diode keeps conducting?

In the OFF state (SW Open) the voltage across the inductor changes its polarity and "pushes" current through the diode. So we have a voltage source in series with the inductor, producing a voltage ...
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0answers
42 views

Darlington transistor heats up : regulating transformer output

I am in great need of a 12v DC transformer. So I built one using some components I have lying around: the case of the transformer I have says ...
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0answers
33 views

A high power IC with adjustable current

I have a transformer that can output 5 volts and 18 or 36 volts via two separate secondary winding. I would like to create a high power voltage circuit that allows me to control the output current. ...
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1answer
74 views

Do I design my device correctly?

I am going to create an electronic scale that measures weight (up to 1 kilogram (2.2 pounds)). For this I will use: Atmega328p SSD1306 module HX711 load cell I will charge this using USB For ...
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3answers
1k views

So why aren't supercapacitors used more often? [closed]

I've recently found out that supercapacitors (C >= 1F or so) are actually a thing. I went searching for their advantages and disadvantages. They don't hold as much energy as a battery, but can ...
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1answer
41 views

Droping dc voltage [duplicate]

I' working on a liting system which is using a T10 style of bulbs. They are 70 volts, 3 watts. There are 6 12 volt batteries to supply 72 volts. When the batteries are fully charged the voltage is ...
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2answers
47 views

Getting different measurements from power supply vs a battery

to start with, I am very new to the hardware side so don't beat me up too much. For a project I am doing I need to build a couple power rails, one 3.3v and another 24v. The power supply will be from ...
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1answer
66 views

What is the difference between RMS and DC?

The "RMS" value of an alternating voltage is equivalent to a DC voltage that would generate the same amount of heat in a resistor as the AC voltage would. And RMS = 0.707 * Peak value [N.B. Sine ...
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1answer
30 views

Buck converter output power definition

I'm designing a buck converter to feed the following loads: A control circuit 3.3V/100mA A 80V solenoid which has a DC resistance of 300 ohms. This means a current of ~270 mA. My plan is to ...
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1answer
82 views

Circuit to switch between direct USB and Bluetooth/battery charging

I am planning to modify a wired keyboard to use a wireless connection, using the HID Relay project (YT, GitHub) as the communication method, along with a LiPo battery, with accompanying charger and ...
1
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1answer
57 views

Complex Power Example in Hayt Engineering Circuit Analysis

In the attached example from Hayt's book, we go through an example where we talk about adding a capacitor in parallel in order to improve the load factor of some industrial load. What I don't ...
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3answers
129 views

How to connect the power plane Microchip AN2587

In microchip AN2587: EMI, EMC, EFT, and ESD Circuit Design Consideration for 32-bit Microcontrollers Page 50 . The following power connection for Vdd is recommended (similar diagram in datasheet) . I ...
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1answer
55 views

Keeping NodeMCU operating with a super capacitor

Awhile back this post asked about providing 3-4 seconds of power to an NodeMCU subsequenst to a loss of its primary power supply. Prior Post I have a similar need except I only need a split second ...
1
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1answer
69 views

Is battery enough to power the Atmega328, display, HX711 [closed]

I create electric scales that will work with small scales. Microcontroller: Atmega328 Display: SSD1306 Load cell + HX711 I want to charge this device using USB. To do this, I will use TP4056 (...
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4answers
86 views

What is meant by average power in AC circuits?

I read that "The average power is the power averaged over a cycle or number of cycles." I know that the average value of power for both active and reactive power is a constant number. Buy I am ...
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0answers
11 views

USB Modem design for GSM Power Supply

I want to run GSM module with Laptop Power through USB. While searching, I have found one document. In the document it is mentioned that five 150uF capacitor need to be used for energy conversion. ...
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0answers
34 views

PCB Power Input Protection/Filtering

I am designing a system that charges 8 LiFePO4 batteries in 8 channels at 1A each while measuring the current and voltage of the battery. I will need a total of 8A entering the 3"x12" PCB and another ...
0
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1answer
41 views

Choosing the right PTC Resettable Fuse for a protection circuit

Power shield protection circuit specs Hello! Iv'e been creating an ESP32 power shield and started designing the protection circuit for the power supply with the following features: Reverse polarity ...
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1answer
39 views

Formula to calculate power from a solar panel?

I am currently working on a project that works with solar panels on Mars and I am trying to calculate how much power I would get from a solar panel on the surface. I have values such as solar ...
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3answers
92 views

designing a electric heater with nichrome wire [closed]

I have a 24 gauge nickel chromium wire i have 12volts 400watts dc power supply help me in finding temperature of wire if length is 0.3m please help me in calculation with the above data
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1answer
23 views

Power output in an Arduino using analogwrite()

I understand that using arduinowrite(anynumberoutput,0-255) will give me a average voltage output x/255 *5v to be outputted from Arduino. Hence, when this question ask, An PWM is generated by the ...
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0answers
19 views

How do I select the subclasses of X and Y safety capacitors? [duplicate]

While designing a switch-mode power supply, I've been reading a lot about X and Y rated safety capacitor. Although I fully understand their use and limitations, how do I determine if I need a X1 or X2 ...
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0answers
31 views

How to model a DC/DC power converter with a pulsed load

I have designed a power converter for a travelling wave tube which regulates a high voltage output of 6kV and 3kVDC well, but when I move onto designing the control system transient response with ...

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