Questions tagged [high-current]

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

36 questions with no upvoted or accepted answers
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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 ...
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0answers
178 views

Voltage Sucked Down on OPA541 (amplifier) Circuit Output

I am currently working on a design to generate a 5VAC (rms) @ 400Hz supply capable of 5A continuous. The design contains a non-inverting amplifier that takes a 213mV (rms) @ 400Hz voltage waveform (...
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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 ...
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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 ...
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0answers
49 views

What capacitor to use for high voltage & high current filter application

I am designing a filter that needs a capacitor. I am not allowed to paste the schematic here, so only the maximum voltage at and current through the cap, pasted from the spice simulation: (voltage is ...
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0answers
219 views

Proper capacitors for ESP8266-12F?, resetting at high current peak

When using the ESP8266-12F on a PCB I designed myself it keeps resetting after a high current spike of another module (Sim800L). I ofcourse tried to solve this using capacitors but I seem to have made ...
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0answers
123 views

Electric heating for glass melting furnace

Some furnaces use electricity for glass melting. Low voltage and high amperage power is passed through the molten glass through 2 molybednum electrodes dipped into the glass. The molten glass acts as ...
1
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0answers
409 views

Pulsed DC, kA range inductive transient protection method

I would like to design a transient protection solution for HVDC_pulse_unit. HVDC voltage = 3500V , current > 40kA. Events: D1 flyback diode survives(50kA surge forward current). MOVs section did ...
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0answers
607 views

Soldering sheet busbars to PCB concerns

Hello fellow engineers I have decided to solder busbars to a high current pcb , but i have 2 concerns : Does soldering a flat busbar (shown in left image) could cause thermal stress and deformation ...
1
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0answers
209 views

Turn ON/OFF 5V 2-5A by Raspberry Pi GPIO

I need to control few 5V 2-5A devices by rpi GPIOs, which has the 3.3V logic level. I come up with a simple circuit, but I'll appreciate any ideas, corrections, suggestions. The LOAD is something like ...
1
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0answers
672 views

Oscillations in Master-Slave High Current Source

I am attempting to trouble shoot a circuit and I am a bit stumped. The circuit is high current source (10-20A) based on a master-slave configuration using OPA549 high power op-amps. There is one ...
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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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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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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 ...
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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 ...
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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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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 ...
0
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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 ...
0
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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 (...
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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 ...
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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 ...
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0answers
425 views

Safe Voltage/Amperage for Soldered Wires - aka When to Crimp Instead

I have found a lot of information that circles around what I'm looking for, but nothing that directly answers it. It is possible there is no right answer.     I am jealous of the Macbook ...
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2answers
122 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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0answers
46 views

Shorting the output of both the channels of L298N

Suppose I started with a project requiring the control of motors and ended with using L298N in my project, realizing that my motor only takes around 1.5A when on load. Now, with time I realized that ...
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0answers
106 views

How to line a Metal Melter secondary for higher safety

A Metal Melter is a kind of home-made low voltage (less than 40 volts, mine is 3v) welder (small-scale) made from a microwave oven transformer (MOT). I left the primary intact (the thicker wire, which ...
0
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1answer
134 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 ...
0
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2answers
169 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 ...
0
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2answers
152 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
80 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/...
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1answer
34 views

Current Boosting Techniques for Source Side

I'm trying to use a portable power bank (5V/2.1A) and try to supply power to my DC/DC Converter which will then be used to power something else (probably a laptop or so). However, the issue is that ...
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0answers
464 views

Connecting a 5V 10A 2.1mm x 5.5mm Power Supply to a PCB

I have designed a system to control LED light strips (Adafruit NeoPixel strips) using an Arduino from a C# program in Windows. I have been through the prototyping phase with a breadboard and a single ...
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0answers
233 views

3kW power supply from 230Vac input

What kind of power supply topology(s) should you use for a CC and CV programmable power supply with the following parameters? input: 230Vac output: 0 - 1000Vdc / 3A max.
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0answers
265 views

Can an IGBT overcurrent damage the driver?

We are using an hex IGBT module (datasheet: http://www.microsemi.com/document-portal/doc_view/7751-aptgt150ta60pg-rev2-pdf) which is driven by two separate IGBT drivers, the 2SC0108T2D0-07 (datasheet ...
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0answers
56 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 ...
-1
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1answer
396 views

How to Control High Voltage/Current like A/C air conditioner with Arduino?

I need to On/Off an air conditioner with arduino. I think Relays are not suitable to handling an A/C. So experts please help me.
-2
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1answer
85 views

Adjustable over voltage protection

I want to build an over voltage protection with adjustable voltage limiter. Operation range would be 5-12 volts. The protector would be "self recovery" - it will reset if voltage again goes under ...