Questions tagged [high-current]

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

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22
votes
14answers
4k views

Finding a faulty chip that draws too much current

Note that this is a theoretical question - there is no schematic I can show. I will show some schematic, but it will be a very simplified version of an actual circuit, only for illustration purposes. ...
27
votes
7answers
36k 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 ...
7
votes
2answers
11k views

Creating a high-current bus on a PCB

I'm planning a custom power-distribution / fuse-board for in-car application, but that requires carrying high currents (50A+ @12v*) on a PCB trace. Since I'd like to keep the board cost, and physical ...
11
votes
5answers
6k 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 ...
5
votes
3answers
18k views

Question regarding use of low voltage high current outputs

I see every day high voltage, high current; high voltage, low current. I rarely see low voltage, high current; why? I know that I can take a high voltage, high current signal, send it through a step-...
22
votes
7answers
4k views

Is there a downside to using multiple relays simultaneously to increase relay capacity

I want to install a relay to my fusebox which is controlling whole basement with machinery. Relays that I have have got 2A limit each, and I have 32 relays. Can I just use all of them for the same ...
2
votes
3answers
1k views

How to choose trace width for very high current PCB?

I am currently designing a PCB layout for my team's high current, high voltage project and am having trouble with choosing my trace width. The circuit is composed of 12 inductors placed in series ...
6
votes
4answers
9k views

Square Wave input into Transformer

Can a square wave generated using an astable NE555 be used as input of a transformer instead of AC? Say, I generate a square wave of 60Hz using NE555 and a 24V at 6A supply and feed it into a ...
4
votes
2answers
5k views

Controlling multiple motor drivers with one Arduino

I have one Arduino and I need to be able to control five to seven 12V motors that each draw about 4 amps. Would I be able to use four Sabertooth 2X5 Regenerative Motor Drivers for this? Each driver ...
13
votes
1answer
840 views

Safety when experimenting with large currents

I am experimenting with large currents from ultra capacitor discharge. For example with 500 A (at 2.8 V) you get a very impressive demonstration of the magnetic field of a straight conductor using ...
8
votes
5answers
1k views

Best way to test a high current pcb design 70A @ 12V

I designed a circuit (MOSFET HBRIDGE) that Should Be able to handle 70A @ 14V. Now that the board is sent out I am on to thinking about how to properly test it. Right now the most logical way I have ...
7
votes
2answers
4k views

Alternatives to breadboards for high-current applications

I've read that solderless breadboards cannot handle more than 1 A of current or so. What kinds of alternatives exist to a solderless breadboard? Would a soldered board make a difference if I want to ...
5
votes
3answers
16k views

is there some sort of paste, grease, spray or similar thing that helps make more contact surface for high-current battery?

I have terminals attached to a battery, which will conduct high-current (40A to 200A), and these are copper plates. As the plates, and battery terminals are not perfectly even (even if they appear to),...
9
votes
3answers
2k views

PCB layout for high side switch (high current)

I'm working on a PCB layout for two high side switches. You can see below a picture of my current layout. The copper weight of the future PCB will probably be 2 oz/ft² (double sided). I use two p-...
5
votes
2answers
1k views

Is there a standard way to implement desat protection on high-current FETs?

To implement desaturation protection on a switching transistor, one typically sets some manner of comparator to watch the voltage across the current flow terminals of the device. If that voltage ...
4
votes
2answers
5k views

Can we remove the neutral wire?

If we have the connection shown below (star connection of the secondary part of a TX), the load per each phase is equivalent (balanced load), then the vector sum of ...
2
votes
1answer
324 views

Current rise time. How fast is too fast?

I'm trying to create a suitable response to Pumping a few Amps for a 100usec. The OP wants to create a 5A current pulse for 100us. They want to have a current rise time of 1us at the start of the ...
2
votes
2answers
3k views

How to join high current wiring?

I need to join 4 wires together: a 6 gauge wire, two 10 gauge wires and a 22 gauge wire. The 6 gauge wire is the current source, the two 10 gauge wires will draw a continuous current of up to 30A and ...
1
vote
2answers
141 views

How can you cheaply make an output pin source/sink about 5 amps of 5vDC, 12vDC, 24vDC, and 120vAC selectively?

I'm working on a project and need to make I/O pins that are configurable to offer around 4 Amps or more of each voltage: 5vDC, 12vDC, 24vDC, and 120vAC. The pins need to be able to source and sink ...
1
vote
3answers
1k views

PCB trace width calculation

Take a look of this product: http://www.hobbyking.com/hobbyking/store/__68694__HK_Pilot_Power_VI_Module_Distribution_Board_And_Dual_UBEC_ALL_In_One_120A_and_10s_.html It says is a 45 by 45 mm PCB, ...
0
votes
1answer
1k views

Explaination of high current zener transistor regulator circuit

This is a high current zener TRANSISTOR regulator circuit. I want to know What does "high current" mean here? How is this circuit working as a zener regulator? What is the purpose of transistor here?...
0
votes
1answer
109 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. ...
0
votes
1answer
86 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
votes
2answers
445 views

Suggestions on how to control a 1000W DC motor

I would like to find out the best solution to safely control two 1000W DC brushed motors by using a atmega328p. In particular, the DC motors are rated: 1000W, 50A, 24V, 2400 RPM. I have a radio ...
0
votes
3answers
3k views

Circuit with switching MOSFET not working

I have this circuit built (updated to remove short-circuit): I'm experiencing some weird behavior though that I don't understand. 1. When I close the switch, nothing happens. No current flows ...
0
votes
0answers
72 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 ...