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Questions tagged [high-current]

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

2
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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 ...
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 ...
3
votes
2answers
1k views

How to pick the right capacitor for device with significant current peaks?

I'd like to power the GPRS modem (uBlox LEON G100) with a 4V 500mA power supply. How can I calculate the capacitor parameters so that they will provide the necessary current for TX slots? The ...
1
vote
1answer
2k views

Is it practically okay to use darlington triple?

I need to control a very high current in my project. I'm planning to use darlington formation with three transistors. I'm planning to use BQ24450 to charge a group of 12V acid-lead battery. BQ24450 ...
1
vote
2answers
5k views

How much current can these diodes handle in real world?

I came across these diodes on ebay today and was very surprised! So surprised that I probably have read something wrong. So I'm asking you guys just to make sure. Can these little guys literally ...
0
votes
2answers
186 views

Slowly supplying power to a very high load

Is it possible to supply power to a very high load within a huge time range? This question particularly regards MOSFETs. I know that a MOSFET must switch fast so that a little power would develop ...
2
votes
1answer
140 views

High current in the presence of high frequency digital logic circuits

I'm in the process of designing an ARM single-board computer that would also have high current (18A) running through the same board. Think of a BeagleBoard, but powered by a 6V/2800mAh battery. So the ...
0
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1answer
74 views

Coupling mechanisms

What are some mechanisms that one material can be coupled electromagnetically to another, other than basic tranformer action? The model I'm considering is a high current electrode, about 1.5m wide, ...
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 ...
2
votes
1answer
586 views

Help dimensioning mosfet as switch with high current

I have the same problem as the guy in this question, but in this case the input voltage varies from 20 volts to 28 volts. I would like a current of 20A to flow through the mosfet without it getting ...
1
vote
1answer
403 views

What happens when the current fed to a device is higher than the specified value? [duplicate]

I have a solar panel which provides the output of up to 500mA with 6v potential difference. .5A is the maximum current output, and the usual output will be around 300-350mA. Can I use it as a power ...
1
vote
1answer
320 views

how to make thin-traces handle high current [duplicate]

According to The Circuit Calculator my 18 amp traces on 4 oz copper need to be about 160 mils. Only problem is I don't have room for this. I've seen boards use raised bus bar and also solder bus ...
7
votes
2answers
10k 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 ...
1
vote
2answers
165 views

10A power suply, high frequency

An EL wire consume ~10mA/m, and need a 1800Hz, close to main voltage, sinusoid supply. (The noise is not a matter as the EL wire itself will cut off the frequency >2kHz). for an installation I would ...
3
votes
2answers
548 views

Is it possible to switch relay above the power spec?

I am planning to use a DC drived SPST reed relay. Below I include the spec for voltage, current and power ratings. Contact Rating: 200W Carry Current: 5A Switching Current: 3A Switching Voltage: ...
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
2answers
542 views

Logistical issue with power transistor and arduino

I have a transistor which will be triggered by an arduino digital pin. When the transistor switch is closed, ~5 A is going to flow from the collector to the emitter. However, I was under the ...
4
votes
2answers
654 views

Protoboard components being used for applications with high current

If I have a few pins of a relay (which is rated for the correct current) that will carry 5A when the relay is triggered, what's the best way to wire this up? Details: I have a breadboard with a ...
3
votes
5answers
547 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 ...
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),...
3
votes
3answers
3k views

Possible to parallel PC power supplies & increase voltage to 14 VDC?

I'm in need of 14 VDC @ 100 amps. Switching power supplies are available but too costly. I have enough supplies left over from various desktops to assemble such a beast it's just how? This is to power ...
2
votes
3answers
2k views

What is the advantage of using many low-farad capacitors instead of a few high-farad capacitors, when trying to maximize current? [closed]

I am working on a high current application, and I am wondering, which maximizes current (over a short period of time), using a bank of small caps, or using fewer large caps?
2
votes
1answer
316 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 ...
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 ...
6
votes
5answers
1k views

The path of electrons in AC circuit?

I have a question regarding the AC circuit shown below. If we ignore the voltage drop caused by the long cable, I think the device will work and the circuit can be considered as a closed circuit. Now ...
2
votes
2answers
3k views

H-bridge ic for high voltage and/or current

I tend to design my circuits around H-bridges, but the problem with making them out of standard mosfets is that I always have to compare the rise times, fall times, threshold voltage, etc of my n-...
3
votes
3answers
1k views

Why doesn't a high current transformer get damaged when shorted?

In this video a high-current transformer secondary coil is shorted with numerous thick pieces of metal - pieces of rather thick wire and a knife blade. All those pieces either get red-hot or just melt....
0
votes
3answers
911 views

Question concerning n-MOSFET switching

I am wanting for safety a uC to determine a few environmental checks before a device is allowed to be activated, it is a relatively low voltage (2V) however high current (4A) load (powered by a beefy ...
2
votes
4answers
1k views

Are vacuums tubes suitable for switching high current (~30amps) at high frequencies (~K-Mhz)?

I was looking to build a system for high currents (say ~30 amps) and a friend suggested vacuum tubes. In theory, vacuum tubes seemed more robust for high current applications, but after looking around,...
0
votes
1answer
340 views

Transmit high current with low voltage on a lightweight system

I have a moving system at 20meters from, say, a base station. The system consumes more or less 200W at 12V. I used until now a battery to power the system. The main drawback is that I have to recharge ...
2
votes
3answers
2k views

Are solenoids/inductors dangerous to have exposed?

An inductor doubtfully will be in a position to be of harm, however a solenoid with 1A+ running through it (and of course a lot of it stored in the magnetic field) can certainly harm the circuit, if ...
5
votes
3answers
17k 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-...
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 ...
24
votes
7answers
35k 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 ...
25
votes
5answers
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 in our designs, so 'high thickness' for us ...
5
votes
9answers
17k views

Switch capable of very high current?

I need to design a circuit that can turn a DC motor on and off. The motor is like a winch motor on a truck an can draw high amounts of current, in some cases up to 200Amps. The motor runs at standard ...