Questions tagged [power-supply]

An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.

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Li-Ion-Batteries & Battery Management System Literature recommendations

Soon I will be starting a job in the battery management system developement for a powertool manufacturer. I just finished my studies in electrical engineering and had one lecture in battery systems ...
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39 views

low power high efficient unregulated ac/dc converter

I am needing to graph an ac voltage onto a computer screen. The voltage is proportional to the moisture content of soil. The ac voltage is close to 0 when the soil is extremely dry and around 100 vac ...
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Feeding microcontroller and linear actuators (motors) with the same power supply

I have already made a diagram using a motor controller. The details of the actuators are: Input voltage: 12VDC Max Load: 750N(168.607lbs) Stroke Length: 16 inch Travel Speed: 12mm/s Duty Cyle: 25%. ...
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How can I power a 3.3v circuit with a 9V power supply and two AA batteries?

I have a circuit that runs on 3.3v. I want it to be able to operate on two AA batteries down to about 2.2v (or until batteries are dead), and also with a 9V power supply. When the power supply is ...
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77 views

Power supply circuit capacitor selection

I'm planing to use this circuit for my op amp test but I don't understand capacitor selection Why C1 and C2 selected 2200 uF but C3 and C4 selected 1000 uF? (C3 is 1000 uF picture is wrong) I tried ...
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How does such an USB step-up 5V-12V work?

I just bought a cheap USB 5V to 12V step up converter: Surprisingly, it works very well. There is few place for electronic components (maybe in the USB connector?), how can we do a 5V to 12V ...
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45 views

Creating a 5 volt (ish) power pack from 18650 batteries

I want to create 5V power supply for a portable lighting project, using 18650 batteries. The power supply needs to provide power to an arduino (which can take 3.3V to 13V input) and some addressable ...
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55 views

Is isolation required for MOSfet gate driver's and microprocessor's power supply?

I have designed a 62W , 24V-5V buck converter operating at 250KHz. I am using TI's UCC27200A gate driver and Infineon's Optimos 4. The problem is that the driver doesn't have any kind of isolation ...
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Can a power supply breaks in this way? [on hold]

in the last month the power supply of the same machine breaks 3 times. I wonder if it is possible that the machine itself is breaking them. The technician told me it’s impossible because the power ...
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which component in this power supply results in the generation of -VCC (-12 volt)? [on hold]

This power supply board has 3 output voltage pins.....but it is not mentioned on the board what the output voltage is of this power supply....The 1st pin is +VCC ; 2nd pin is GND and the 3rd pin is -...
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PSU drops both current and voltage when connecting to an LED

I'm connecting a DC PSU to a high power LED. I'm setting the maximal current, and a voltage. For the first few seconds, I'm in the c.c mode (voltage drops from its initial value to a lower one). But ...
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EP53F8QI Short to GND fault

We have a design with an EP53F8QI that multiple ICs have been burned both at room temperature and +80 °.C. We are using it to create a +3.3V and on fault we have found that the +3.3V supply is shorted ...
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70 views

Connecting and disconnecting the power supply

I have learned that powering a chip without ground is quite dangerous and might cause permanent damage to the chip or the board in general. I have also seen that happening many times in non isolated ...
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1answer
91 views

Mechanical Switch Causes Transients from AC-DC Power Supply

I'm having trouble getting rid of output transients from this Mean Well PSU right after the AC input is switched. https://www.meanwell.com/Upload/PDF/RPS-500/RPS-500-SPEC.PDF The PSU is a RPS-500 ...
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106 views

Why don't people power LED strips in parallel instead of using amplifiers?

The common pattern to run long LED strips seems to use separate transformers and amplifiers in between the individual strips. Why not use a single transformer, controller and appropriately thick ...
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24 views

Tp4056 Module 12V input

I want to build a lithium ion battery charger with tp4056 module but most of my power supply's voltage is 12-19 V Datasheet says input voltage is 4.5-5.5v and current 1A Can I connect 1-3 tp4056 ...
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59 views

Rf Quiet variable power supply from switch mode?

Is there a circuit diagram somewhere for turning an ATX switch mode power supply, or one of those cheap switch mode psus on eBay, into a variable and RF quiet power supply? I’m assuming it is ...
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135 views

How do airplane in-seat power detection circuits work?

Airplane in-seat AC line-voltage power outlets have limited available current/power. I remember reading that laptops or laptop power adapters can somehow detect this and inform the laptop that it ...
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1answer
44 views

Filttering noise out from high frequency 1MHz oscilator (Teslacoil driver)

I have a 74HCT14N based ''RC'' square-wave oscillator. The produced signal then goes to PMIC gate-driver and finally to a mosfet which drives the primary coil at resonant frequency. (about 930-1000kHz)...
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3 phase 4 wire(480V) AC to 12VDC (100mA) power supply for energy metering applications

I am currently working on a 3 phase energy meter project. I don't have a lot of experience in designing power supply circuits (AC/DC) let alone a 3 phase 4 wire one (L1,L2,L3 adn N) with a transformer ...
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42 views

Why are many 9V DC wall adapter power supply measured as 12-14V by a multimeter? [duplicate]

I have tried with many (working) 230V - 9V DC wall adapter power supply (of different brands, some of them coming with an electronic Yamaha device, etc.): they all show a higher voltage when ...
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38 views

Replace a battery with power supply in a portable router [closed]

I have a portable router with usb port for charging the battery Lithium-ion 3.7v 2000 mAh. Right now the battery is totally dead, and buying new one is not an option for me. Can i power it down with ...
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46 views

Voltage dip at source side during heavy loads due to Internal Resistance

In any application, during initial start-up/load step, there is an high current requirement. Due to this high current requirement, there is a dip in that connected voltage rail. I researched on why ...
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80 views

Voltage doubler and power

Lets consider for instance this voltage doubler: It was told that a practical limit of this circuit is the fact that we cannot absorb too much current from it. But I wanted to verify (if it is true) ...
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2answers
54 views

Best way to switch between multiple power rails based on whether they're present or not

I've come across this issue multiple times already and never really figured out the best way to do it. I'm designing a controller PCB for a drone and I would like to have a few different ways of ...
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29 views

How do I measure the fluctuation of a pulsed voltage of ~1700V?

The problem: See the little sketch. Starting from a high-precision DC power supply, I pass the voltage to low-pass filter and a pulser. This pulser pulses the nominal voltage of around ~1700V down to ...
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65 views

Power flow direction of wind farm [closed]

If a wind farm is connected to grid so as to transfer any excess power, how to make sure if power flows from turbine to grid and not from grid to turbine? One possibility is turbine could act as a fan ...
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1answer
45 views

Create circuit for 12v auto washer pump to 230v mains with push button for art installation

I am creating an interactive art installation in a gallery context using a 12 volts car headlight/windshield washer pump. It basically is a fluid washer pump taken outside of a car into a gallery, ...
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36 views

Sync Buck - how to estimate switching loss?

Here is the problem I am working on, from pg105-106 of Fundamentals of Power Electronics 2nd edition. As stated in this book, "The ability of the MOSFET channel to conduct current in the reverse ...
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1answer
59 views

connect circuit to a cigarette lighter

I have a PCB that I put together and it works pretty well so far. My big issue now is I would like to power it from the cigarette lighter on my airplane. The cigarette lighter inside a car sits on a ...
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71 views

Transformer very basic questions [duplicate]

Good day for all. My question is about the power on a transformer and its functionallity. I know that the power is the same in both inductors (ideally), if I've a source at 240V/10A then the power ...
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99 views

I'm trying to learn how to make these circuits but have no clue if I'm on the right track? [closed]

I've recently been doing some online tasks but I am really struggling to understand how build this circuit in multisim. I am also struggling to calculate the values listed in 2. and have tried to find ...
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Why would a Intel 8080 chip be destroyed if +12 V is connected before -5 V?

The Intel 8080 is a classic microprocessor released in 1974, fabricated using an enhancement-mode NMOS process, and shows various unique characteristics related to this process, such as the ...
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108 views

Why is there a resistor between the primary and the secondary winding?

I recently opened up a linear power supply and found out it has a resistor of 8.2M ohm between the primary winding (specifically in the neutral) and the secondary winding of the step-down transformer. ...
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46 views

Cheap trickle charge from wall wart?

Hi. I'm curious if it would be proper to do something like in the attached pic. You'll notice that I have a AC wall wart basically in parallel with a battery (say six AA penlights), both nominally ...
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Add Electrical Socket to a light circuit [migrated]

I have a garage in the building where I live, is equipped just of light, so switch to power on and off and the bulb at the ceiling, i don’t have any power point to plug any simple tools like drill, or ...
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1answer
44 views

Power-supply made of battery+solar cell, ultra low power

In various scientific calculators, we can see that they have "twin" power, basically a mixture of a solar cell and a battery. I would like someone to tell me what kind of circuit usually takes both ...
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67 views

Negative 15V supply from 24Vdc

For my application I have two AD633 Analog Multipliers that need a ground referenced +-15V supply. I have a 24VDC and a 8 VDC supply to use, but i would prefer to use the 24V supply. I've looked at ...
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49 views

Powering ETH Controllers

I began working with Ethernet controllers and there is a recurring theme that keeps confusing me. Currently I am incorporating the KSZ9031RNX into my design. The data sheet calls for digital and ...
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66 views

What are the functions of these components in this 15V 500mA power supply?

Hello guys, I want to know what is purpose of the transistor T3 (BC547B) in this circuit. I understand it provides base current to the series pass transistor T5 (2N3055). Also I want to know: What is ...
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34 views

Powering long lengths of WS2812B Pixel Tape

I've been doing a lot of research regarding powering WS2812B pixel tape. From my tests, running a 5m length of 30 LEDs per metre tape requires powering at both ends to avoid yellowing/browning when ...
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46 views

Active low-pass filter

I have some question about active low-pass filter. First, I want to tell you guys that don't have enough knowledge in electrical. so, please explain your answer and idea clearly. Thank you. I want to ...
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1answer
51 views

The real supplied energy for some device is not equal to the energy of a battery, right?

These are some informations about the Lithium-ion button battery LIR2032: Voltage: 3.6 V. Capacity 35 mAh. So its full energy is \$3.6 \times 35m \times 3600\ \text s=453.6 \ \text J\$ But if this ...
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1answer
63 views

What can I use to supply 220V DC to this motor?

I have a small 220VDC motor I would like to drive via a speed controller, so I can continuously adjust the speed. I'm in Australia with 240V mains, and I also have an adjustable 0-220V AC controller. ...
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Can we calculate the upper bound of needed power from some information from datasheet? [closed]

This is a energy harvester product data sheet, and we can know some information below https://www.powercastco.com/wp-content/uploads/2016/12/P1110B-Datasheet-Rev-4.pdf 1.\$V_{out} \$ current = 100mA ...
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63 views

“Temporary boost” supercap

I have a 12VDC load (up to 10A) that functions correctly down to 8VDC. Sometimes (frequency: many seconds max, many minutes typical) the power source has a very brief (few milliseconds) drop to 7V. ...
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How does increasing the duration of the transient response become a problem?

I'm looking at the TI TPS727 LDO regulator datasheet and it says this: 8.2.1.2 Transient Response As with any regulator, increasing the size of the output capacitor reduces over- and ...
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2answers
139 views

Supplying an MCU from 110 or 220V line [closed]

I've been struggling with this for a while : am looking for a way to power an ESP32 microcontroller (at 3.3V, or 2.6-3.6V) from a 220V line. I am trying to do this using only my home'e electrical ...
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104 views

I'm working with 12V 6.5A power supply, should I be worried? [duplicate]

I'm an electronics novice and I'm working with 12V at 6.5A. (I'm activating the power supply with a series of electro-mechanical relay switches controlled by an Arduino. The power supply lights up a ...
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1answer
42 views

ORing, cascading and reverse polarity protection for power inputs

I'm trying to design a circuit that could be powered by an USB host OR by a wide voltage range power input. These are my requirements: the USB rail (VUSB) should be obviously protected from the ...