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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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 ...
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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.
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3 answers
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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 ...
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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, ...
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4 answers
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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1 vote
1 answer
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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 ...
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2 answers
218 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 ...
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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 ...
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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 ...
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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 ...
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370 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 ...
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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 ...
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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 ...
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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 ...
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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. ...
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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 ...
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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?
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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 ...
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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 ...
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2 answers
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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 ...
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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 ...
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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/...
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1 answer
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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 ...
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2 votes
2 answers
2k views

Powering high power LEDs without resistors

I have a bunch of 3W UV LEDs which take 3.6V@0.7A 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 ...
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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 ...
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12 votes
5 answers
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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 ...
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1 vote
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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 ...
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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 ...
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1 vote
1 answer
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How to match gate driver with Power MOSFET?

I have a HB power MOSFET , and I need to check if the driver that I choose drive the Half Bridge MOSFET by a good way Here the schematic and Specification of the driver and MOSFET ...
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1 vote
2 answers
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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 ...
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-1 votes
1 answer
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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 ...
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4 answers
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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 ...
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How to make lightbulbs filament stronger? [duplicate]

If I make the tungsten filament in a lightbulbs thicker could it then handle high electricity flowing through it without burning up so fast. Also could making it thick, allow it to handle being cut ...
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How to efficiently power and arrange 100 multi chip LEDs in 6 different colors each color runnig off their own transistors

First time on here hope I have given sufficient information. I am trying to power 100x 5W high power multi chip LEDs and 8x 3W high power LEDs. I would like to do so off of 120v Ac house plug. The ...
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1 vote
3 answers
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Separating high- and low-power ground-planes

I am designing a bi-directional DC-DC converter for automotive use. Therefore, there is some high-power stuff that needs to be implemented on the pcb. The overal layout is as such: My question is if ...
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1 vote
3 answers
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What is the Best Way to Reduce High Power Three Phase Rectifier Ripple?

If a three-phase 220V AC @ 50Hz(three lines having 127V RMS voltage if measured to neutral each) mains supply is rectified with a standard 6-diode rectifier looks like this: I believe if 25 amps is ...
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2 votes
2 answers
856 views

Why AC induction motor is used for high power applications?

I know that in the variable voltage variable frequency you are able to keep the torque constant in various speeds , but i have also read something about them not requiring commutators but i couldn't ...
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Where can I find 1.5kWh energy, at about 5-15Wh/kg batteries that can deliver about 350kW power? (as indicated on this wikipedia article?) [closed]

I am a rookie in this field, so any kind of feedback/edit is welcome! :) I am currently trying to find supercapacitors/batteries that have following properties: Have about 1.5kWh energy, at about 5-...
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Driving a LED high current / high speed (>= 200nsec pulse width, >=10us delay)

I have a project for which I need to pulse a LED at pulse times starting at 200ns followed by a delay time typically >10us. I want to achieve high current in this pulse period to emit enough light. ...
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Controlling high voltage/current signals with a Pi function generator

YES, I understand corona, arcing, safety, and Ohm's law... I am building a high power AC/DC variable power supply: Microwave oven transformers, CW voltage multipliers, flyback transformer, variac... ...
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1 vote
5 answers
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Non-Invasive High Power DC current measurement

For one of my projects I need to measure if there is a DC current going trough the thick power cable. The current is DC, and my method of measurement has to be non-invasive. The current going trough ...
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Component for switching 1000V - 100Amps condenser discharge pulse

I am miniaturizing a circuit used to generate a pulse using condensers into an inductive load. I am a little lost on what would be the best type of component to choose to start the discharge (ie. a ...
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Low rpm, high power calculations help

Im trying to build an electric wheelchair with mecanum wheels, and as you might know, each of its 4 wheels has to be independently powered for the chair to have holonomic motion. With my desired ...
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1 vote
4 answers
991 views

Transformerless BUCK SMPS for 1kV->12V

I have a challenge to push 500 Watts (15V) at 100 meters of telco telephone cable (0.088mm2, 28 AWG, 200Ohm/km, 500MOhm insulation). The only way to achieve this is by boosting the voltage up to ...
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10 Watt LED and LED Driver related question

I got a 10watt LED from Ebay but never thought that the driver and heat sinks are must-haves for this little master. When googled, I found several circuits of LED driver. But none of them are ...
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