Questions tagged [high-current]

Say how much current is required, high-current means different things to different people.

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1answer
49 views

How to connect 50 A 12AWG cable to a shunt resistor in PCB?

I'm designing a PCB in which the current of a BLDC motor is measured through a PSG4NTEBL500F shunt resistor. The DC supply of the motor is connected to the PCB through a 12AWG cable and the circuit ...
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2answers
67 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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10answers
9k views

Dangers of capacitors blowing up

I was wondering what kind of damage a 350V, 6000uF (link to capacitor) electrolytic capacitor could do. will this kill me if it blew up next to me? I have never blown capacitors before, but I ...
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0answers
25 views

Is there some type of SPDT device that can carry high-current DC loads while closed, but switches when there is no current? [duplicate]

In particular, I'm looking for a type of relay-like device that: Is mechanically latching (or similar) Is effectively SPDT Can handle 50+ Amps DC when closed Is extremely safe and reliable Will fit ...
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1answer
37 views

Are there any specific types of small latching relays that can handle running high DC currents? [closed]

In particular, I'm looking for a relay that: - Is mechanically latching - Can handle 50+ Amps DC when closed - Is extremely safe and reliable - Will fit in the palm of my hand I'm assuming the ...
1
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4answers
67 views

How to power a high current / low voltage circuit through wall outlets?

I'm trying to wrap my head around this basic problem but I'm stuck here: I'm using 4 of these LED strips and I'm not sure how to safely power them. They are rated at 18W/M, so 4 strips * 5m * 18W = ...
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0answers
16 views

Will running a tab between the positive terminals interfere with a 4S BMS?

I have 3 12V, 64AH battery packs with a 50A MPPT solar charge controller and 3 50A balancing boards. The rest is theory because I'm still waiting for components to arrive but... Normally, the ...
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2answers
170 views

Seeking recommendation for capacitor to handle high pulse current

I'm seeking recommendations for an inexpensive capacitor that will handle fairly-large pulse currents. Maximum voltage is 15 Vdc applied to the capacitor and I'd like to see current pulses in the ...
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0answers
57 views

DIY Spot welder power- limiting factor?

I'm trying to build a spot welder for spot welding 18650 battery packs but I can't get it to work (very weak welds). The goal is to be able to weld 0.3mm thickness steel strip (nickel plated steel ...
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2answers
153 views

Power Supply for two 50V/12.5A Solenoids

I'm in the planning stages of building a custom pinball table and one of the sticking points is powering the flipper coils. They're 50V DC coils with a resistance of only 4 ohms during the stroke. ...
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0answers
39 views

Thermal cutoff for a high current mains application

I'm designing an inrush current limiter for a large rack which will under normal conditions draw ~25 A at 230 VAC. I'd like to be able to trip the current carrying live wire if the temperature in my ...
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3answers
324 views

Splitting DC Supply Rail with High Output Currents

I'm currently working on a audio amplifier circuit that requires split supply rails. I have a wall converter that can supply 19V, and I ideally want to be able to create a ± 12V supply rail out of the ...
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1answer
49 views

What value of inductance and type of inductor should i choose for my motor driver circuit? [closed]

I am current design a DC motor driver circuit for 24 volts and 50 amperes since the motors I am using take 25 amperes nominally. I will be using PWM signal to control the output. I was suggested to ...
1
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1answer
70 views

Low voltage / high current rectifier using MOSFET

I was wondering if the following approach to make a very low voltage / high current rectifier (~0.1 V, 1 kA DC) from 230 V AC has any sense or not. Aiming at simplicity rather than effectiveness, I ...
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1answer
47 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 ...
2
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2answers
103 views

Two-Channel PWM LED Driving at 12A Load Issue (Signals affect each other)

I am designing a two-channel PWM LED driver. It will switch 24V LED strips at 12 amps. Each strip has two white LED chips. Each channel complements the duty-cycle of the other one (i.e. while one ...
0
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1answer
157 views

10 Amp Current Limit

I have a 28VDC, high current supply (constant voltage) that is required to charge an emergency power supply. These EPS internals are rated at 15 amps max input current, however, it’s stipulated that ...
1
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1answer
64 views

High current, slow turn-on, low ripple power supply

I am a hobbyist and I'm trying to make a power supply that withstands a few amps load, that also has a slow turn-on and low ripple. I'm powering up an ESP32-Cam that's pretty sensitive to ripple and ...
0
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1answer
56 views

Smoothing out current spikes so three-phase machine doesn't exceed site's electrical supply

We are looking at installing a machine at one of our manufacturing sites that draws around 120A at 415V three-phase (we are in the UK) but the maximum current we can draw at our site is 100A before ...
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0answers
42 views

ULN2803 relay driver working for high loads

I am trying to understand the working of this Darlington transistor array. I am using it for inductive loads and for driving the loads of my relays, but now I am trying to understand the part of its ...
0
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1answer
136 views

MOSFET-switching between two power supplys: how to avoid transverse current?

For a hobby project I would like to switch between two power supplys. The two power supplys are two 6s LiPo batteries. If one battery is empty i want to immediatelly switch to the other battery. (the ...
2
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1answer
727 views

TDA7294 100W Audio Amplifier Causing Unexpected Problems

This is the circuit I will be referring in this question: TDA7294 is described in this data sheet. Upper IC with added external components is a well-known circuit and can be found on many websites ...
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2answers
320 views

Why do I get high DC current in grid tied inverter output?

Edit: Added gating signal waveforms. Changed some of the graphs, I accidentally put a test circuit waveforms the first time. Current is not that high but offset is there and current is high for a ...
0
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1answer
85 views

If I use a 19V 4.7A supply to a MAX 250W ATX power supply am I an idiot or should it be safe enough?

I can do the maths, I get near 90W, but I'm only planning to draw under a quarter of the power supplies (ebay link) rated max of 5V/12V combo (estimated load 30W). I therefore consider my 19V old ...
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3answers
94 views

What is a “safe” amount of amps to draw from this pack

I've been working on a quadruped project, and need some help determining the... safety... of my power system. To start, there's two packs, a larger "main" and a smaller "reserve" the two packs are ...
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2answers
127 views

Multiplexing high current connections?

Noob question here. Currently I'm using a darlington transistor array to drive about 14 IR leds. I want to be use a CD74HC4067 multiplexer to simplify and shrink things up a bit. The IR led's I'm ...
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3answers
107 views

Is Inductor peak current same as the Inductor Inrush current

I am using a DC-DC converter which is having an inductor rating of 68uH and 2.05A. Output Voltage of dc-dc is 23V and output current max is 300mA Schematic : I am using a current probe and ...
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1answer
72 views

12v 25A power distribution PCB design

The goal is to control 18 devices by using rocker switches with LED. The total ampere can be up to 25A. The PCB size is 150mm x 250mm. The configuration is FR-4 with 2 oz/ft^2 copper. The bottom ...
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1answer
88 views

Creating High current DC Power supply [closed]

I have the following resources: Input - 24 V 80 Ah DC Battery (Car Battery) Output, what i want: 12V DC with <2 Amp for driving some of the sensors. 5V DC with <2 Amp for driving micro ...
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1answer
94 views

1000uF capacitor to protect 5v 30amp circuit

I wish to build a LED cube but have no experience in shift registers so I am building one with addressable LEDs that can draw 60mA each. I want to make an 8x8x8 cube so that would be 512 LEDs and 30....
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0answers
15 views

lightning current with isolated cable

I am trying to understand what happend when designing a lightning protection system using isolated cable (with specified separation distance, lets say in this case with 0.5m). Following IEC 62305 I ...
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2answers
62 views

How to have a load pull more current from a low voltage high current battery

I am designing a pair of heated pants and have run into an issue with having to use batteries (or any other portable power source) to power them. What I have now is about 50ft of Teflon wire with 5Ω ...
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0answers
39 views

N-MOSFET not passing current when gate is high (SPICE)

I'm having a very strange issue with some power MOSFET circuits I'm trying to build for regulated high-current pulses. I can get my circuit to work fine when I use a lower-amperage power MOSFET, but ...
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0answers
62 views

Thyristors problem in a 1800v capacitor discharge system

I have two thyristors “R1275nc21x, they are Westcode thyristor and have some issues in my application. I want to make a capacitor draining system with 1800V charged and it can discharge to the coil (...
28
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6answers
16k views

High PCB copper thickness: What are the pitfalls?

We need to carry high currents on a PCB (~30Amps sustained), so we are likely to order our PCBs with high copper thickness. So far we've only used 35 microns (1 oz) in our designs, so 'high thickness' ...
3
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5answers
153 views

High Power Variable Potential Divider

I have a DC high voltage (>270V) high current (>40A) circuit which needs to power a standard LED along the way to a heater. The LED is to indicate whether or not the heater is activated. I'm ...
0
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1answer
161 views

Multiple voltages power suply, high current

I'm trying to design a battery back-up power supply for my home network devices. I need these: 48 V / 40 A 24 V / 10 A 12 V / 2.5 A 5 V / 5 A I got a 48 V / 60 A industrial power supply with battery ...
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0answers
56 views

How should I modify a welder to add a pedal to enable the output?

I'm restoring/improving an old welder rated 3.2 kW input, 115 A DC output, 52 V no load. I'm adding a ready made soft-start circuit based on a NTC plus bypass relay rated 100 A and capacitors to ...
1
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1answer
76 views

High current over 5V on PCB panes instead of track

I have leds running for around 600 Watts of 5V leds (120 amps). The source of the power are three 48V to 5V converters which each can handle 200 watts. If I would run this amount of Amps over my PCB ...
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1answer
35 views

Ground separation between ADC and high current capacitor discharge circuit

I recently designed a capacitor discharge welder for my welding applications, and I come through a problem about separating grounds between AGND of the controller and (-) terminal of the big 1.3 ...
3
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5answers
570 views

Getting ~600W of power to 2048 LEDs

Despite my Computer Systems Engineering degree, I haven't played with electronics for over a decade, and I'd like to get back into it. I have a project idea, and I think I've got all the design leg ...
4
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4answers
366 views

Multiple switching LED drivers on single PCB

I am working on a high power LED board project. It requires to have 100 LEDs, of different types and colors. There will need to be 17 individual strands (need to be able to dim them separate.) Max ...
27
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7answers
39k views

How to carry high current on PCB

I need to pass high current on some part of my circuit. I used an online PCB track width calculator to see that required track width is about 5mm and minimum clearance is 1mm, which makes it about 7mm ...
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1answer
40 views

Connect multiple source pins together to power signal in Eaglesoft

According to PCB shown below, I have a bunch of MOSFETs with HSOF package with 7 pins of source for each and failed to connect EVERY pin to the connector. In other words, when routing the source ...
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2answers
194 views

Stacking M.O.T. to create an E-E core

I just came across this site looking for answers on some questions I have concerning microwave oven transformers (M.O.T.). I am currently going into my third year as an E.E. student and I am trying to ...
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2answers
252 views

Can single phase AC produce a continuous electric arc?

Constant DC supply and 3 phase AC (in mercury rectifier) can produce a continuous arc. But can single phase AC also produce a continuous arc? Because it is written on the web that arc extinguishes at ...
0
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0answers
88 views

Oscilloscope high voltage and current measurements

I have been tasked with measuring both the voltage and current output of a plasma system but have only been provided and oscilloscope to do this (Tektonix TBS 2000 Series 100MHz, 1G/s) and a high ...
0
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1answer
103 views

Supercapacitor based lightning-harvester [closed]

Could lightning discharges be harvested and stored in supercapacitor banks? Could supercapacitors withstand and collect lightning? Lightning usually lasts for about 10 micro seconds and reaches ...
1
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0answers
65 views

Standards for colour of conductors of pre-assembled cables

We are designing a product for industrial energy storage systems. Multiple units are connected with pre-fabricated cable assemblies of 2-4 separate leads that are terminated in connectors unique to ...
3
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1answer
89 views

How to design a contactless mechanical shaker [closed]

I am trying to design a circuit to make an inductor oscillate with high-current (around 50A) at a low frequency. The inductor will act as a high-powered electromagnet. Most designs I've worked/messed ...

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