Questions tagged [power-supply]

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

614 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
6
votes
1answer
88 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. ...
4
votes
0answers
83 views

Radio module resetting when fluorescent tube switched on/off

I have a PCB powered by an IRM-30-12 power supply (230VAC to 12VDC). On this PCB, I have a MRF24J40MD from Microchip and a Udooneo to drive it + a 5VDC regulator and the 3.3VDC of the Udooneo. After ...
4
votes
1answer
323 views

Safety Capacitor Selection

When selecting an X2 safety capacitor what must be taken into consideration. There are only a few types of capacitance ranges and seem to be chosen based on voltage rather than capacitance. Take ...
3
votes
1answer
96 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 ...
3
votes
1answer
168 views

Integrated 5V uninterruptible power supply (UPS) with a lithium cell?

I'm trying to figure out the best way to implement a UPS for an embedded system that runs from a 5V supply. Essentially the system has a 48v to 5v, 1.2A output DCDC converter that powers my system. ...
3
votes
1answer
158 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
votes
3answers
605 views

Efficient 60v to 12v DC-DC

I'm on the process of building a new version of my ebike electronic systems and I'm searching for a way to lower the voltage of the battery (13s = 54,6v fully charged) to 12v/5v for the accessories ...
3
votes
1answer
543 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 ...
2
votes
0answers
139 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 ...
2
votes
2answers
81 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) ...
2
votes
0answers
46 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. ...
2
votes
0answers
87 views

Massive pk-pk ripple on output using isolated DC-DC converter module

I'm having a very odd issue using an integrated DC-DC isolated converter module. As the module stabilizes, a massive pk-pk ripple is developing on both the output and the input. At first we thought ...
2
votes
0answers
58 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 ...
2
votes
0answers
98 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
votes
2answers
124 views

Can I use a current divider to protect my IC?

I designed an oscillator circuit using a TLC555 timer IC to create a 2 second pulse, which is used to drive a 12V 6W solenoid via a relay. Both the IC and the solenoid are run off of 12V, but every ...
2
votes
0answers
51 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 ...
2
votes
1answer
116 views

Cuk converter implementation

I have come across this article: https://www.powerelectronics.com/power-management/step-down-dc-dc-converter-eliminates-ferrite-cores-50khz-enabling-power-supply-chip That describes the Cuk DC/DC ...
2
votes
0answers
626 views

ignition timing light trigger current

I've built an ignition timing light, following: http://citroen.tramontana.co.hu/en/ignition/stroboscopic-timing-light here the original schematic: I've changed some components: Instead of the ...
2
votes
2answers
112 views

Any downside to feeding a buck regulator into a linear one?

I need to convert 12 V down to 5 V and 3.3 V. I am using linear regulators right now but they get pretty warm and eventually I would like to supply more current for it (around 500-700&...
2
votes
0answers
123 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
votes
0answers
185 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
1answer
297 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 ...
2
votes
0answers
59 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
votes
0answers
131 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. ...
2
votes
0answers
503 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
votes
0answers
659 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 ...
2
votes
0answers
129 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 ...
2
votes
1answer
150 views

Designing an efficient PSU

I am designing a PSU capable of producing 5 watts @ 5V 1A. The design will power about 12 RGB LEDs (totaling about 400mA @ 5V) and a audio class D 1.4 W amp. Space is no issue but efficiency and cost ...
2
votes
1answer
629 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
votes
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 ...
1
vote
1answer
57 views

Suitable substitute for a hard to get IRF440 in a switched power supply?

I am repairing a HP 6023A lab power supply for a friend. The problem was that the power fets had failed. This is what the relevant schematic looks like: The incoming 120VAC or 240VAC is rectified and ...
1
vote
2answers
162 views

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%. ...
1
vote
1answer
98 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 ...
1
vote
0answers
61 views

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 ...
1
vote
0answers
30 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 ...
1
vote
1answer
39 views

How to interpret a negative primary leakage inductance in a three winding transformer?

i would like to compare the leakage inductance on the primary side of different transformer geometries. I simulated a three winding transformer with an UI Core. On one leg i have the splitted primary ...
1
vote
0answers
36 views

LTC3112 undefined behaviour when power supply reaches current limit

I am getting a behaviour of LTC3112 that I do not understand. I am using it very close to the schematic recommendations in the datasheet. It works perfectly fine until my power supply (TOE 7610-60) ...
1
vote
0answers
18 views

Fixed Frequency Control of Multi-Resonant Converters

I am currently designing a SMPS based on the half-bridge LCC converter. Due to my application, it is desired to operate the converter at a fixed frequency. I also wish to optimize the passive ...
1
vote
1answer
42 views

By pass diode in PV cells

hope you all are well The bypass diode is usually connected in parallel with PV cell to avoid hot spot and prevent more PV output power losses. The bypass diode is connected in opposite direction to ...
1
vote
1answer
112 views

Replace mains 12v power-supply with 12v battery

A Yamaha digital piano is powered by a mains power-supply. The power-supply states the following input/output values: INPUT 100-240V~50/60Hz 0.5A OUTPUT 12V === 1.5A (Where I have written === there ...
1
vote
3answers
73 views

Simpler ways to develop a buck regulator

I am designing a low profile space grade buck regulator. I have the following constraints ICs must be space grade Low component count Small size The converter specifications are as follows. Input ...
1
vote
0answers
51 views

Draw 15V from USB C Power Delivery devices

I need to draw 15V from USB C PD capable devices such as power banks or chargers. So I need a rather small tool or build for this I can draw about 15V 3A via usb c with. Thanks for your help.
1
vote
0answers
51 views

Reverse engineering LCD signals on HP power supply

I have recently acquired an HP 6632A power supply and was inspired by Roberto Barrios' project of replacing the screen with an OLED display to do the same. However, it is evident that the 6632A is ...
1
vote
0answers
52 views

Can MIC4102 be used to drive Boost Converter

I'm trying to design a high-power Buck-Boost converter, which is meant to convert a 45-63V input voltage into a "constant" 48V. The application requires quite high currents (up to 20A continuous). The ...
1
vote
0answers
93 views

Can I use diodes to protect power supply outputs?

(Note, this is my first question on this site, please point out if there is something that I am doing wrong here.) I have a thyratron that requires two separate power lines to attach to it. The two ...
1
vote
1answer
36 views

Powering a usb hub using a different source

I dont really know much about electronics and I tried to seach online if this specific thing im thinking of doing has ever been posted and i cant find anything exactly the same. So what im trying to ...
1
vote
0answers
30 views

Pulsed Power Charging Resistor and Choke

I am currently attempting to build a pulsed power supply that requires an 8 H inductor to produce 50 kV 17 A square pulses with widths of 100 uS. Please see the attached schematic for more details (...
1
vote
0answers
52 views

How do portable batteries with AC outlets handle the ground pin/wire?

There are many portable batteries ("power stations") that have AC outlet(s) with – what looks like – a dummy ground pin. From what I can find in their manuals, it doesn't seem like these devices are ...
1
vote
0answers
34 views

Power supply charging backup power - current flow via mosfet

I have following diagram on falstad Top +5V is main PSU (12V 10A). Bottom +5V is battery (12V 2.3Ah). I have load about 2-3A so I dont think diode is good solution. Well I am trying to achieve ...
1
vote
1answer
69 views

What is (was) this component at ZD102 (top left, next to powered serial connector)

Part at ZD102 is overloaded with too much current and blown. It's three legged, with two legs on the south side and 1 on the top. The left side (white in the picture) is blown and has since ...