Questions tagged [high-power]

High-power refers to voltages 1) greater than 1000 Volts AC [Vᵣₘₛ, rms…root mean square] and 2) greater than 1500 Volts DC according to standard IEC 60038 of the International Electrotechnical Commission.

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Heat-Sink-Connection LED: NVSL219CT

I am currently planning my new PCB with 2 LEDs (NVSL219CT). I would operate the LEDs with 1.5A. What I could not find in the datasheet: Is it allowed to connect the HeatSink to the ground plane? ...
Janik Weis's user avatar
2 votes
2 answers
91 views

What is the best way to convert 3ph 380VAC to 3ph 0V >> 450VAC in range of 800 kW?

I have a company that makes servo AC voltage regulators and some other transformer-based products, and today some of my customers asked me to give him a quotation for an 800 kW Variac, the biggest one ...
AlMoutaz Billah's user avatar
1 vote
2 answers
79 views

Voltage/Current ratings for dual SCR modules

I'm working with a different kind of package of SCR than what I'm used to, where there are two SCR's in one package. So the Datasheet for this SCR-module only has one rating for voltage and current, ...
zmcginty's user avatar
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63 views

High power, wideband balun transformer

I wish to design a 'somewhat'(ill-defined; i take what i can get) compact balun connected from a coax cable to a custom design dipole antenna. The design of the antenna is wideband in the sub 1 GHz ...
R_N's user avatar
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3 votes
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Modding a $30 fog machine, driving high power LEDs?

I've recently acquired a $30 fog machine off Amazon that features, next to the obvious fogger, eight high power RGB LEDs, controlled in series via a RF remote. The LEDs are very bright so I assumed ...
Johnny Verbeek's user avatar
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2 answers
188 views

Why do we need admittance, susceptance and conductance?

What is the need for modelling circuits and transmission lines, and loads using variables stated above when we can use resistance in the real domain and reactance in the imaginary domain. Are not the ...
MALLU's user avatar
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2 votes
0 answers
131 views

How do I implement precharge for a 24 V, 1 kW inverter?

In this circuit here I tried making a pre-charge circuit to start up a 24 V, 1 kW inverter which would draw 40 A of power so is this circuit good? Why keeping the MOSFET in the linear region is not a ...
Hazardous Voltage's user avatar
5 votes
4 answers
1k views

Looking for ideas to about cooling multiple MOSFETs in TO-247 packages

I am designing a device based on TO-247 MOSFETs. The power is pretty high - about 50W per package, so it's going to be either water-cooling or something big with fins and fan. All is great, except ...
TQQQ's user avatar
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1 answer
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Making a MOSFET-based constant 14 VDC input to constant 11 VDC (8-20 A) output voltage regulator circuit

I have a constant 14 VDC source and I want to get a constant regulated output of 11 VDC regardless of the load current, knowing that the load is varing from 8 to 20 A with low frequency. What is the ...
Marko Turner's user avatar
2 votes
2 answers
470 views

Which layer should I use for high power signals in a four layers PCB?

I am designing an SMD PCB to control two motors that consume 6 amperes each. I have too many components and I am using 4 layers, but it is very disorganized, so I want to separate the tracks. I want ...
Raul Rodriguez's user avatar
1 vote
0 answers
98 views

How do I measure impedance at high power?

I need to measure the impedance of a passive device at its operating power, about 100-watts, and its operating frequency, from 0.1-MHz to 10-MHz. The venerable "operating impedance bridge" ...
Brian K1LI's user avatar
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99 views

3 W Power LED without heatsink (350 mA)

Can I use this Prolight Opto PK2N LED at 350 mA without a heatsink?
DJDB999's user avatar
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3 votes
2 answers
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What is the name of this HV test measuring setup?

There is a measuring setup similar to the following photo in our laboratory which belongs to PASSON VILLA company. What is the engineering name of this device and how can I find a catalog or something?...
WeTech's user avatar
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1 answer
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Using High Power Relays to Actuate an AC Motor

I want to remove the need for contactors in a motor application. Currently we are using a 1.5HP (1.1KW) motor and actuating it via a contactor. I have a PCB I am designing and want to use the ...
radhlw's user avatar
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2 votes
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150 views

What is the name of this huge high-power test equipment?

It seems very old, maybe more than 50 years, and it doesn't have an information plate.
WeTech's user avatar
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3 answers
88 views

Low spread high power laser

I am looking for a laser which can travel about 10 km through air from one end of a lake to another. It needs to have a minimal spread, i.e. a small diameter spread over the 10 km - less than 10 cm ...
user813801's user avatar
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317 views

Is it possible to obtain a sine wave with a 3 phase inverter?

In several pages, I have read that it is possible to obtain a sine wave (maybe with harmonics) from a three-phase inverter, with six transistors or thyristors, like this: I have seen some techniques, ...
ilich qynn's user avatar
4 votes
4 answers
360 views

what role does transmission line termination take in long distance power lines?

Does transmission line theory and transmission line termination take any significance when dealing with long high-voltage power lines? Do power companies terminate their power lines to avoid ...
Joaquin Brandan's user avatar
1 vote
0 answers
411 views

What is the most effective way to prevent electrical arcs across resistors?

When building any kind of ultra high voltage boost circuit or transformer, the high voltage will often arc between components if the voltage is high enough and the distance between them is short ...
Delaney Fitzpatrick's user avatar
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0 answers
232 views

Help generating a 10Vpp squarewave at 13.56MHz

I'm working on a test fixture for which I need to generate a 10Vpp square wave, at 13.56MHz, capable of driving 250mA. My first attempt was a using opamps, but very quickly realized I can't drive ...
jrive's user avatar
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2 answers
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Regulating high voltage high current ac supply

I am trying regulate ~250 ac to have regulated 400v 5A dc. I have a variac and also a step up transformer (1:5). I know for this type of high voltages full bridge SMPS are used. But actually I don't ...
Ismail's user avatar
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5 votes
3 answers
7k views

How does this circuit in an electric mosquito swatter work?

I had an electric mosquito swatter lying around so I decided to open it up and check out how it works. I understood some parts of the circuit however I did not clearly understand how the rest of it ...
Seb's user avatar
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1 answer
218 views

Alternative to train current collectors (pantographs)

A current collector (or pantograph) is a mechanical system used by, for example, trains and trams, to collect current from an overhead wire. When thinking about high-speed trains, e.g., the ...
bodokaiser's user avatar
1 vote
1 answer
287 views

Inrush current of high voltage power supply

I have seen some solutions for inrush current, but my case I think it's a little different. The point is that I need to limit the inrush current of 1500 volts peak rectified. In my project I need to ...
Lucas Ribeiro Barzotto's user avatar
-2 votes
2 answers
420 views

How to combine high voltage and high current source? [closed]

Can whimshurst machine (high voltage and low current) and homopolar generator (high current and low voltage) be connected in parallel to draw high watts? Please explain the process & flow of ...
Yogie's user avatar
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0 votes
1 answer
281 views

RS-550 DC motor controller 24V (35-70) A working range and a stall of 120A

I am currently designing a motor controller for a SUMO robotics challenge. Each of a two motor setup exhibits a (0.15-0.40) N.m torque resulting them pulling (35-70) Amps nominally and a peak of 120 ...
adnan's user avatar
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0 votes
1 answer
140 views

Power devices max voltage, current, power, speed, etc. .. ratings

I want to know how to get the real world or the most recent or the reliable information about power devices max ratings in volt, ampere, power, speed .. etc., parameters. I found this picture that is ...
R1S8K's user avatar
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2 votes
2 answers
233 views

High wattage 12 to 5 V

I have an LED project with a pretty hefty power draw - 1.5 kilowatts. We're trying to figure out how to power this from a (large) 12 V battery bank. We need to have the entire 1.5 kW output travel ...
Narfanator's user avatar
3 votes
0 answers
552 views

When is a 5mm thick PCB a better choice than solid bus bars?

I have in my possession a 5mm thick printed circuit board. It comes from a 2000-era Sun Blade server, where it connected 4 redundant 70A power supplies. I also have a need to assemble some high ...
mjt's user avatar
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0 votes
1 answer
220 views

Power multiple parts of one project from one wall wart

I'm building a project with a high-power 10W RGB LED controlled by PWM from a microcontroller. Right now I'm using a wall wart to power the LED, and powering the MCU through my computer's USB. My ...
BenAndo's user avatar
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1 vote
2 answers
1k views

How to determine PWM Frequency of a MOSFET to drive a BLDC motor?

What are the factors determining the PWM Frequency of the MOSFET driver circuit that drives a BLDC motor. Is there any equation for PWM calculation? For eg. I need to control the speed of a BLDC ...
Vidu Kriss's user avatar
1 vote
0 answers
192 views

Size and weight of DC-DC vs DC-AC at equivalent powers

I am looking at designing two power systems for a project and was wondering, at equivalent power, let's say 10kW, what is the system that is easier to design, can be smaller in volume and lighter in ...
elt93's user avatar
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1 vote
2 answers
842 views

IGBT destroyed. Help me identify any potential problems

I am trying to build an inductive oven control (for temperatures up to 1500 C), that controls the temperature by turning on the the inductive oven on and off like a commercial inductive hotplate. ...
GRASBOCK's user avatar
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0 votes
1 answer
96 views

Looking for resources for determining cable requirements for high wattage (MW) applications

I'm doing some personal research on the specifications for cables that can handle megawatt power draws. As an example, the wires needed to supply 450VAC @ 2000A (0.9MW). I'm looking for wire diameters ...
user1325543's user avatar
0 votes
1 answer
287 views

Potentiometer is Heating [closed]

I have this light dimmer circuit, when I plug it into the AC, the dimmer works fine but I noticed that the heat in potentiometer is increasing, is there any workaround to fix this problem?
stevenjake's user avatar
0 votes
2 answers
332 views

ON/OFF strobing multiple high-power LEDs (500mA+)

Goal: I have an application requiring strobing of many (30+) individually addressable, high-power (500mA+) LEDs. Each LED sequentially will be switched ON/OFF at a rate of about 10Hz, switching from ...
chroma's user avatar
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0 votes
3 answers
1k views

High-Power Switching using MOSFETs

For a project, I need a means of switching a high-current circuit between two inductors. The purpose is, each inductor serves as an electromagnet, and they are switched every 15s or so in order for ...
user avatar
1 vote
2 answers
729 views

Parallel busbars: how to orient?

As part of my research, I'm doing calculations on a hypothetical high-current (4000 A) medium-voltage (5000 V) DC power transmission system using two parallel busbars. However, I need to decide how ...
Hearth's user avatar
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5 votes
2 answers
386 views

Identification of a part on a power line's lightning arrester

I recently spotted an arrangement of wires on a lightning arrester on top of a power line. The power line is IIRC a 110 kV, 16.7 Hz, two phase line for railway systems. The lightning arrester is of ...
Ariser's user avatar
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0 answers
101 views

20A current measurement with hall effect sensor

I am not aware of drawing more than 1A over PCB traces. We are planning to use ACS712 hall effect current sensor linked below: https://www.amazon.in/KitsGuru-KG134-ACs712-Current-Arduino/dp/...
Abhishek Parikh's user avatar
0 votes
1 answer
2k views

Problem switching a MOSFET with arduino

I have a Problem turning a MOSFET On/Off with my Arduino. I try to controll multiple mosfets to supply a high power Device with current. Now my issue is that the mosfet does not turn on. Here is a ...
seppdepp3's user avatar
2 votes
2 answers
2k views

Powering high power LEDs without resistors

I have a bunch of 3W UV LEDs which take [email protected] each approximately. I need to power 50 of them since I need about 150W total power. My power supply is 12V, so I need to lower that down to 3.3-3.6V ...
BackSlash's user avatar
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0 votes
4 answers
1k views

Running a 15HP Motor with a 30 kW VFD

We are going be buying a 15 HP motor, and using a VFD we have, currently not doing anything. While I'm told that typically, you buy a VFD for the Motor (i.e. 15 HP Motor + 15 HP VFD), we couldn't let ...
Akasaka's user avatar
12 votes
5 answers
11k views

High Voltage PWM Motor Controller - Mosfets Explode

I've searched every post for an answer to this problem. I've built a motor controller circuit as shown in this diagram. I made the diagram as accurate as possible. The diodes on the mosfets were ...
Doctor Circuit's user avatar
1 vote
0 answers
332 views

soldering 5x5x1 high power SMD LED: anode, heatsink, cathode

I've got myself a high power SMD 850 nm LED, 650 mW radiant power. I need to use this non-stop for hours at a time. So I need to solder this to a heatsink to manage the heat. I've got 4 them, actually ...
runcyclexcski's user avatar
0 votes
1 answer
61 views

Relay Data Sheet question

I need help understanding what these ratings mean. This is a general purpose relay. I'm confused. The Turn on/Off voltages are these voltages that need to be provided to the relay to turn the relay ...
magicsword's user avatar
2 votes
1 answer
2k views

How to match gate driver with power MOSFET?

I have a HB power MOSFET, and I need to check if the driver that I chose drive the half-bridge MOSFETs the right way. Here are the schematic and the specifications of the driver and the MOSFET. ...
user3212448's user avatar
1 vote
2 answers
4k views

10x 3w led lights to run off 12v battery

i have ten 3w leds i need to build an array to run from a 12v car battery. Led (forward voltage 3.6) (forward current 700 ma ) (Source voltage 12-13.9) Will this work and if it will what wattage ...
Hillbilly_H's user avatar
-1 votes
1 answer
279 views

How can something like a Arri 20,000 watt light bulb handle so much power?

I'm curious to know how can something like the Arri bulb or any bulb near that wattage range can handle so much power? The filaments is thicker so is that why? As regular ligh bulbs would burn around ...
DeusIIXII's user avatar
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10 votes
4 answers
19k views

Controlling high current (1000A) with MOSFETs

I am currently designing a capacitive discharge spot welder and am running into the issue of switching. I plan to use a few super capacitors in series to discharge around 1000A in a very short ...
LetterSized's user avatar
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