High voltage current limiter circuit

So to get through such problems I introduce a high current variable voltage power supply circuit which can drive 10A of load, the current handling capacity can be increased simply by connecting 2N power transistors in parallel. I happened to design variable power supply schematic diagram for my inverter battery for safe and quick charging.

My 30Ah lead acid inverter battery takes more time for constant voltage charging when I use a LM variable voltage regulator. This is due to its lower output current. So I connected a power transistor which helps to increase the current without varying the voltage.

The maximum input to this DC variable power supply is 37 volts.

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You can buy this circuit from our Circuits Gallery Store. This circuit will not work, only one of the 2n transistors will carry the lions share of the current.

Variable (Adjustable) Current Limiter Circuit

There are no required caps in this schematic? How would you go about adding a power indicator led to this? Whenever i connect load at output the output voltage at emitter reduces while the current increases. I regulate a 3. I require a constant voltage of 3. Based on my research they said synchronous voltage regulator is the most efficient compare to linear regulator….

Dear Sir, first of all thnx for this circuit i want a circuit where i have to connect gps and gsm with car battery and output current should be 2A of regulator IC so tell me can this circuit can i use and can i replace lm with ic. At 1v and 10 amps out with 30v in, you would need to dissipate watts. A 2n on a decent size heatsink can only dissipate 30 watts, so yoare going to need 10 of them. The emitters of the s should have a 0. Needs a fuse in the output.

I want to be able to adjust the power for a motor between 2 and 3. What will happen if I use a power source of only 3. Thanks in advance! Hi can this circuit power an 5 amp drawing electromagnet. So my question is with the above modification will it power even electromagnets???

Thank you.

help make a high current (20A 12v) current limiter?

I needed better regulation than LM could provide for charging 4 x 1. So I did not need a 2N Voltage output just varied from 6. Hello, I need a little help troubleshooting my test circuit.

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Im testing the circuit and the voltage does vary at the output with the potentiometer. Emitter of the pwr Transistor. This happens without a load. However when i hang a load the voltage drops drastically and does not deliver current to the load, so it does not work, at least not enough to light the bulb.Though these regulators are outstanding with their specified functioning and reliability, these regulators have one big disadvantage The circuit presented in the following article introduces a DC regulator design which effectively counters the above issue and is able handle voltages as high as V.

However in areas where input voltages can be higher than 35 or 40 volts, things become difficult with these ICs.

Failing to find a suitable match I had to advise the customer to go for a panel that would not generate anything above 30 volts Initially when the power is switched ON, R1 triggers the mosfet which tries to transfer the voltage at its source input voltage across the other side of its drain pin. The values of the unspecified components in the circuit may be calculated by the following formulas and the desired output voltages may be fixed and set up:.

The maximum output voltage should not be set above 20 volts if a IC is used. If you have any circuit related query, you may interact through comments, I'll be most happy to help! Your email:. Dear Mr. Thank you. I might be missing something, but after searching the internet for how a p-channel mosfet works I can't see how this circuit could work except when the input voltage is very close to the output voltage like within volts.

A p-channel mosfet needs gate to to raise up to the source to shut it off and this design holds it too low to ever stop it from conducting. The op-amp is driven from a much lower source voltage than the mosfet source so it can't shut it off — this design will just uncontrollably leak power from the input to the output. Has anyone got this to work? I have discussed the concept elaborately in the following post, you can refer to it for an in-depth study:.

high voltage current limiter circuit

I was looking for a motorbike regulator design and came across this. A p-channel enhanced mode mosfet typically has a source gate threshold of a volts so if the op-amp can't drive the gate to nearly the input voltage, it cant shut it off and the op-amp is powered from a much smaller voltage so it can't get there. There needs to be a pull up resistor to pull the gate to the source voltage and the op-amp needs to drag that down which gives circuit start up issues so it'll never start-up.

I might have got this wrong but reading about a p-channel mosfet characteristic's on the internet I can't see how this can work at anything other than when the input voltage is very close to the desired output voltage — otherwise it will runaway and always pass the input voltage out to the output. Hi I would like to build voltage amplifier as well as regulator using lm The input would be 50 mv to 50 volt.

The input pulses per min would be The output pulse should be regulated 5 volt at all frequencies and voltage inputs. Plz if you could build the schematics for me.

Tx for the reply. The input would be from 25 to 35v but the battery bank is only 12v. Hope to get a viable one. Please Google "buck converter circuit" you find plenty of them, use the one suits your application the most.A constant current circuit can also be used as a current limiter.

The downside is the LM can only source 10mA. The next series of circuits will use the LM While designed as a variable voltage regulator, it will double as a stable constant current source. With only three pins as shown above, one can produce a current of about 1-amp max.

See LM Spec sheet. Resistor range is: 0. The 10 ohm resistor produces and current output of mA. One can vary Vin from 15 to 35 volts and Iout will stay a constant mA.

high voltage current limiter circuit

In Fig 3 the current has dropped below mA due to Vin of volts to two close to the output voltage for the load. This makes LM useless as a constant current source below 5-volts.

In Fig 4 we removed a LED for a voltage drop on the load at 6. Once we have the proper Vin vs. Vout the load has no effect on the current. In Fig. The load doesn't change the current from a constant current source in fact I could short out the output and maintain mA. Note the LM will get hot - and voltage not dropped by the load will be dropped by the pass transistor, LM etc. Don't go wild with a large Vcc powering a small voltage load. Above we boost the current out of a LMThis circuit provide automatic current limiting up to 8.

This current amount limit is adjustable from 1. You can modify the component value to give different current limiting range. The resistor R1 is there to sense the current.

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At R2 potentiometer at minimum resistance the center tap connected to R1if the current drawn by the load reach 1. This shorting action reduce the base current and therefore reduce the output voltage sensed by the load, and prevent the current to flow further.

Because of the power dissipation capability of 2N transistor, at the worst case that the load is shorted to ground zero resistanceif you limit the current to 8.

The maximum voltage can be handled by this circuit is 60 volt, but at that maximum voltage you can only safely set the current limit at 1. Please make sure the Q1 transistor has sufficient heat sink.

Update some questions from our reader I have some questions regarding this circuit:. Com] Update some questions from our reader I have some questions regarding this circuit: How is the input ground and the output ground connected in this circuit?

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If my load is equivalent to 1. If I limit the current to the load from 5A to 2A, what is happening the 3A directed away from the load? Is it being dissipated as heat or what? Will this circuit provide continuous current at or below the set current limit threshold? In this example I am dropping 5A to 2A. Will the circuit continue to provide 2A, or will it shut off current like an open switch? Thank you very much!! Basic Uninterruptible Power Supply Circuit. LM Switching Regulator.

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Power Electronics I design simple High Voltage current limiter source, but mosfet get broken every start. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. I design simple High Voltage current limiter source, but mosfet get broken every start. Thread starter astro power Start date Dec 6, Search Forums New Posts. Status Not open for further replies. Thread Starter astro power Joined Sep 29, 8.

Which designed to give mA current output.

high voltage current limiter circuit

If the capacitors are not empty over 50VDCthe 1N60 work fine. If i change to 4N60 which is stronger mosfet, the circuit works fine every start. By R2, i set the maximum current output of the circuit.

I think the N-Ch Mosfet get on very fast, and react more quickly than NPN Transistor, and the current draw of the empty capacitor, is over 1A, which cause the Mosfet to blow when i switch on.

high voltage current limiter circuit

So the simple solution, is to make the Mosfet get on slowly. I do not want to solve the problem by stronger Mosfet, like 4N60, it more expensive and the circuit should be economic. Thank you. High Voltage Current limit. Scroll to continue with content. Not necessarily. A partly-turned-on FET dissipates a lot of power, so the quicker it turns on the better. Hello, We do not allow transformerless powersupplies.

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Please fill in required fields. Sign up. The trend towards higher line kVA ratings and the growing intermeshing of power systems are increasing the likelihood that distribution switchboards will be subjected to unacceptably high short-circuit currents. Reliable and economic protection against these surge currents is provided by the I s -limiter.

This fast-acting switching device triggers a small charge to open the main conductor, which is designed to carry high operating currents. The current commutates to a parallel fuse with high breaking capacity, which limits the short-circuit current during the first rise. I s -limiters are being used successfully in more than 2. Such a fast switching device caters for a variety of applications which cannot be fulfilled by conventional switches. The most important of these are presented below.

See Figure 1 below.

I design simple High Voltage current limiter source, but mosfet get broken every start.

Coupling - parallel operation of two systems. He received the M. Submit your inquiry and we will contact you. Quickly find an ABB channel partner. Learn more I agree. Navigate Search Login layouts-flyoutmenu-cart.A constant current circuit can also be used as a current limiter. The above circuit is for testing only! This is designed to limit circuit damage for developing other devices such as an H-Bridge.

Active Current Limiting Circuit Schematic

With a 5 or ohm load adjust for desired maximum current. Here I've used a LM as a constant current source to control the base current Ib through a MJ 15 amp watt transistor. This supplies a far higher currant than the LM by itself. In the diagram above taken from a live circuit test in the first video Q1's base current Ib is set by the 2K potentiometer and 10 ohm combination to produce an Ib of 8. Using a pass transistor does create a hfe drift problem as the transistor heats up - in my test higher hfe thus more current to the load.

The LM current doesn't drop to zero mA and even at the lowest setting Q1 is still turned on producing about mA so adding a ohm resistor across Q1 B-E solves the problem. Voltage regulation after the circuit is recommended and for the best efficiency use an input voltage near the desired voltage.

Above we boost the current out of a LM

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