Questions tagged [power-supply]

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

922 questions with no upvoted or accepted answers
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173 views

Switch between 2 power supply feeds without device losing power

I have done a search on here but didn't find the answer (maybe "woods for the trees") but here goes... A brief 'background' -- In my house, there's a switch by my front door that turns on/off the ...
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2answers
99 views

High power (up to 400W) LED DC/DC power supply design considerations

I am designing a power supply for a high power COB LED requiring 360W @ ~75V from a variable ~60-80V DC input. I have noticed that it is difficult to find switching controller ICs that advertise being ...
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45 views

Disk array power supply pinout/conversion

Sorry for crossposting this, but I've had no answers from the more specific Ggroups. I'm in the process repurposing a power supply from a scrapped Sun Microsystems StorEdge D2 array which was working ...
3
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1answer
129 views

Rechargeable battery pack for circuit

I have this circuit and I have to somehow integrate this into a mobile phone cover. So to power it, I was thinking of using a 3.7v 600mAH Li-Po battery. I want to integrate the battery into the cover ...
3
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183 views

TP4056 and ST32F103C8T6 shorting after few uses

Complete schematic: Top part: Lower part: This is the circuit schematic, top part is sensor, bluetooth, microcontroller, oled and pins related all working from 3.3v coming from regulation of a ...
3
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1answer
49 views

Sensible way to power an OLED display from AAA Cells

I'm designing a small battery powered device and I want to use an SSD1327-based OLED display. Unlike the SSD1306, this one doesn't appear to have an integrated boost circuit to power the panel, which ...
3
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0answers
140 views

How to design analogue compensation for SMPS from Bode Plots?

In a complicated switched mode power supply where the transfer function is unknown, is there a way to design an analogue controller and compensation from the bode plot alone? I am having difficulty ...
3
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0answers
139 views

Help identifying component in SMPS

I have been working on a Schroff/Cherokee Europe PE1947/23B SMPS (circa 2004?) and have had trouble identifying a component within the circuit. This SMPS features the following outputs: +12v DC @ 8A ...
3
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0answers
149 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 ...
3
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1answer
198 views

Ringing issue on I2C FM+ bus between MCU and few sensors - Power supply issue?

I'm experiencing some issues while probing a problematic I2C bus on the oscilloscope. We want to interface several TLV493D-A1B6, with a STM32L4 (we are working as well on STM32F4 and have the same ...
3
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1answer
323 views

Powering 9216 leds @5V, @24V with converters

I am struggling with a power supply question. I would like to power up and control 9216 LEDs -- strips of 144 LEDs/meter (WWA SK6812 - just like the RGB kind). These are powered at 5V and draw 43.2 ...
3
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1answer
2k views

Lithium ion battery protection IC not able to drive MOSFET

I have integrated the TP4056 charger design into my PCB. The problem is that when I connect the battery at the battery terminals, I am not able to get the voltage at its output pin. The circuit can be ...
3
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0answers
818 views

Deriving PI controller transfer function when input is reversed

I'm developing the compensator for the linear DC Bench Power Supply I'm designing. As I've come to deriving the transfer function for the op amp-based compensator, I realize I've been depending on a ...
3
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0answers
146 views

High Frequency Ferrites for Transformers

There are many Ferrite material grades Available.The optimum frequencies start around 20KHz and extend well into the MHz range.There are also many core sizes to go from watts to Kw .Planar cores are ...
3
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1answer
659 views

Proper way of designing a battery backup system with 12V/5V dual output AC power supply?

I have a project (doorlock) with MCU / LCD / Keypad and solenoid (lock) connected together. MCU, LCD and Keypad runs at 5V while solenoid runs at 9V to 12V. I'm currently powering the system with an ...
3
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4answers
2k views

How to make a simple negative power supply

I want to experiment with amplifiers but I need a negative power voltage source. I looked for some circuits but as far as I found they either are not simple & reliable or require an IC. Is there ...
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0answers
24 views

How can I control the output level from a HV (220VDC) floating regulator using a DAC?

I have a 240V DC supply I want to clean up and make adjustable (150-220V) with an LR8 high voltage floating regulator. I can't use the standard way of connecting the DAC to the adjust pin (current ...
2
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0answers
48 views

Grounds in a linear bipolar power supply for audio?

I've purchased a linear power supply, as surplus, from a local electronics dealer. It's a Condor AA15-0.8, made to supply ±15VDC at 0.8A or ±12V at 1A; as far as I can tell, it's a standard regulated ...
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0answers
115 views

How to ground a flyback transformer?

I designed a 50,000 volt power supply, that I am having problems with on grounding the HV side of the output. The HV appears to be injecting HV into my logic sections through the ground, damaging the ...
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0answers
38 views

Portable Headphone Amp Power Supply 18V MCP73871 TPS61178 TPS7A470

Disclaimer: I'm fairly new to diyaudio, amplifiers, power supplies, schematics, PCB design and everything that this forum touches on (read: noob), so I urge you to be patient with me - I am eager to ...
2
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0answers
80 views

ATX power supply doesn't cut the current after being turned off

I made a power supply for my electronic projects using a ATX power supply of a older computer and used a button connecting the black and green wires to turn it on/off. I noticed that sometimes when I ...
2
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1answer
97 views

Pi filter with resonance in power supplies

I have recently read in older book (I don’t have it on me, it was from at least 90’s) about LC filter with resonance in chapter about filters in power supplies. It looks like regular pi LC filter but ...
2
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2answers
103 views

Charging a Phone With a Lower Current-Rated Power Supply

My friend's iphone charger exploded. She was charging an iPad with it. Since the iPhone power supply has a current rating of 1A while the iPad charges with a 2A current, many are blaming her that she ...
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0answers
69 views

Can a Capacitance Multiplier be used with high voltage outputs?

I am designing an SMPS which two output voltages of 5kV and 2.5kV. My transformer is split into four equal sections, each feeding a FB multiplier, connected in series to form the final voltages. ...
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0answers
69 views

How to remove DC power supply noise while load is active?

I'm using a breadboard power supply to power up two STM32F103, two Hall flow sensors, one IC555, and one 16x2 LCD with backlight. While everything is connected I have alot of noise in the system which ...
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0answers
129 views

Power Supply Nixie tubes (IN 9)

I am in big trouble with my power supply for Nixie tubes (IN 9 bargraph.) I need 140V -160V (150V prefered) output voltage and 10x 12mA --> ~140mA current. (~ 21W). I tried to design boost ...
2
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2answers
128 views

High frequency reduces power on circuit

I am not expert in electronics so there must be many errors that I am not considering. I designed a simple half wave rectifier that gives signal to a LDO voltage regulator of 3V3. In the input I have ...
2
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2answers
261 views

Battery failing. Oscilloscope?

The question is - is there an inexpensive oscilloscope I can use to measure DC voltage and current to see why my battery pack is failing to power a DSLR? In order to take long time lapse photos with ...
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0answers
55 views

Can I generate following voltage waveform with single PWM FET?

I am designing power supply which must output following voltages at a maximum of 1.5 A stepped down from a 24 V DC supply. 24 V 13-15 V 0-5 V Waveform for one of the inputs requires following ...
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0answers
348 views

2 Switch Forward Converter Volt-Sec/Charge Balance

I am attempting to design a 2 switch forward converter. I understand how to do the volt-sec balance and charge balance when the converter is as shown in the ideal 2 switch forward converter below. I ...
2
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1answer
318 views

charging lithium ion battery of 3.7v

I have a device in which I have used 3.7v of the lithium-ion battery for power supply and for charging this battery, I am using a tp4056 module. when I connect a battery to tp4056, battery fully ...
2
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0answers
140 views

55-650V to 5V DC/DC convertor design

For an application I am building I need a custom DC/DC convertor that can convert a voltage ranging from 60V-600V to a contant voltage of around 5V. Using the TI Webench with the paramaters Vin_min = ...
2
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1answer
460 views

Average current mode control compensation

This is the structure of average current mode control (source here). Please look at signal \$V_{com}\$ at the positive input of PWM modulator. For proper operation, in steady state the magnitude of ...
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0answers
2k views

Where is the Intel Common Redundant Power Supply (CRPS) Standard Specified?

Intel server reference designs use the Intel Common Redundant Power Supply Standard (CRPS). These documents include a brief over view of CRPS with information like the pin names and refer the reader ...
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0answers
196 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
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1answer
460 views

Can I use a twisted pair cable to send power to a device that uses a micro-USB jack?

I purchased a Google Home Mini that according to the specs this requires 5V, 1.8A. The OEM power cable has a transformer that plugs into AC and has about 3 feet of cable terminating at a USB micro ...
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0answers
89 views

Connecting the output of two motor controllers together - even if briefly

I am building a dark ride at my house for a party (long story), where the I have a ride vehicle that is a wooden base with 4 casters and 2 powerchair motors hugging a center 2x6 rail on a plywood base ...
2
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0answers
161 views

Badly designed USB power supply?

Purchased a device from an online retailer (fairly well known and reputable), they ship from internationally and often include a local USB wall charger to replace the one in the box of their goods. ...
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0answers
653 views

Advanced ATX Power Supply Modifications

I know there are multiple tutorials and questions regarding converting an ATX power supply, new or old, to a benchtop power supply for projects. I'm fully aware of how to make the basic conversion to ...
2
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1answer
1k views

Arduino controlled bench power supply

I'm looking for a schematic to control LM317 and LM337 from Arduino via digital Pots MCP42010. I'd like to build this schematic (input dual 30V, 500mA transformer per coil) However, with digital pots ...
2
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1answer
828 views

Power Supply Stacking in Parallel

I have two DLM 60-10 Sorenson bench power suppllies (10A limit) that I am wanting to stack in parallel so that I can provide between 1 and 20 A, at a consistent 12 V. I'm not particularly an ...
2
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1answer
1k views

Designing a DC 12V 80A Power Distribution PCB panel and heat sinking

Background I'm trying to build a small hobby grade ROV for an underwater robotics competition held at the university I'm studying. And I have used eight brushed dc motors each of which consumes 8A on ...
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1answer
94 views

85W laser array driver circuit

I have an OSRAM 85W 450nnm laser array. It's essentially a large 'chip' with 24 integrated laser diodes (break it down they're approx 3.5W diodes each.) The Chinese source I purchased it from also ...
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0answers
58 views

TTL in an RF switch

I am hoping to find help on how to properly connect supply voltage to my switch assembly in order to actuate. My switch has input requirement of +15, -15, GND, and +5V. Also, the 5v logic inputs. ...
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82 views

How to calculate values for my variable DC power supply

I am making a variable DC power supply via Multisim and the values are given to me is V1=7, V2=15, Imax(load)=209mA (both V1 and V2 is DC value which is on U1.) I am using resistors, an LM317 voltage ...
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54 views

Investigating RCD nuisance tripping when ACCL changes power source

My apartment is supplied with 2 sources of electricity: the grid and a generator in the apartments premises. The change over is controlled by an ACCL. The apartment has an 25A ELCB/RCCB with 100mA ...
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108 views

Why doesn't USB power the circuit?

I am absolutely new to electrical stuff, and I am just trying to create my first project. I am basically trying to drive a strip of RGB LEDs (in a form of a Christmas tree) using attiny85. I have ...
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0answers
30 views

Capacitor filter optimization for ATmega32U2 board

I've been working on a project built around a ATmega32U2 with a PMW3360DMâ€T2QU optical sensor and I have some questions on where and when capacitor to ground filters are necessary. Many of the ...
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0answers
27 views

Powering cmos invertor from battery charging line

I use MCP73831/2 for charging a battery. But now I have to power a logic gate from the same line (I mean connect gate's vcc directly to the battery and to charger output). Is it a good idea? Could the ...
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0answers
14 views

What is non-characteristics harmonics and inter-harmonics in HVDC?

I have only heard about harmonics in AC power, but in the HVDC system, these terms are used. How do they affect the system?

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