All Questions
Tagged with current-limiting power-supply
82
questions
0
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1
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64
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How can I wire four Peltier modules in parallel with current limiting?
I am currently working on a project to cool different materials for a local young student program with engineering.
My thinking was to attach Peltier modules to different materials and, using an IR ...
- 1
0
votes
1
answer
34
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Can I use the CC/CV converter as the LED strip driver?
I have a power supply - Molex from power supply unit (5V, max current - 11A). Besides lighting there are other consumers that do not need current stabilisation. I want to power 9 ws2812b LED strips ...
- 3
0
votes
1
answer
60
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Current limiting stopped working on a power supply
I have an old power supply (Tesla BS554) and all of a sudden the adjustable current limiter stopped working.
The supply is designed to limit the output current up to 1 A, but I am measuring short-...
- 87
1
vote
1
answer
70
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Protecting parallel loads
I have a project that has two separate sections that must be powered from the same power source. I do not know the resistance of said loads, but I know the power supply that each of them on their own ...
- 135
1
vote
1
answer
188
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Not able to get enough current from buck boost (sepic) converter made using TL494
I am trying to build a buckboost converter for converting 5-40v input to 5-35V output at 3A max to use it for many purposes by usign TL494. I am using a SEPIC topology as i want a non inverting output....
- 15
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40
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Proper DC supply vs batteries
For the current limiter circuit(using voltage regulator), proper DC supply matches the simulation results. However, when a battery of equal supply voltage is connected, the circuit goes haywire i.e. ...
4
votes
1
answer
765
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Why is this circuit not limiting current?
This is a 15V voltage regulator from Art of Electronics (page 694), and it is supposed to limit the output current to 1A.
However, when driving load impedance (R7) low enough, I am getting much higher ...
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12
votes
5
answers
4k
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Is it recommended to set the current limit on a bench power supply by shorting it?
I have a Rapid 85-1901 switching mode 0-20V 0-5A bench power supply:
Without a load attached the current shows 0A no matter how you turn the dial.
After searching how to set the current limit online, ...
- 515
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4
answers
2k
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How to handle a current load that is *just* outside my 12V power supply's limits
I have a portable diesel heater which runs on 12V. When the heater starts, it warms a glow plug that draws somewhere in the range of 9-10A until the plug is hot (figure, roughly 1 min), after which ...
- 1
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votes
3
answers
57
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Power supply circuits to supply specific voltage with current limitations
I have an old sensor that requires 200mA at 5v DC, but it does not have any overcurrent protections and will blow a capacitor if the current is too high. Is there some kind of current limiter circuit ...
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votes
1
answer
108
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Control the current of a power supply using another variable power supply connected in series
While disassembling a little electric oven (rated for 1300W at 230V), I scavenged one of the heating elements inside, which I measured its resistance to be about 40 Ohms (let's call it ...
- 181
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votes
5
answers
64
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Interpreting datasheet for switching regulator
New to this and designing my first non-trivial circuit. I'll be using an ATMEGA168 and plan to run it at 3.3v/10MHz to maximize compatibility with other components.
I'll be placing this into some ...
- 115
1
vote
1
answer
161
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Why is the MOSFET current taking time to rise in linear mode of operation?
In the below current limiter circuit, why is the MOSFET current rising slowly?
Shouldn't the MOSFET current follow the equation \$i_D=\kappa(V_{GS}-V_{th})^2\$?
Ref: How to Make Linear Mode Work
- 3,032
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0
answers
74
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Adding max current regulation to outlet of voltage regulator
Hello I have the following circuit that I'd like to use to charge a battery. The battery is specified to charge up to 12.6V max and so I have implemented a voltage regulator that will produce this ...
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-2
votes
1
answer
250
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What is the current through a diode in series with resistor when forward biased?
What is the current through a diode in series with resistor? Let's assume the source voltage is 12 V 800 mA max having a forward biased diode of 0.7 V drop connected in series with a resistor of 10 ...
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votes
3
answers
92
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Current limiter for VOD3120AB
I want to supply VOD3120AB with a voltage of 24v/2A from Power Supply. What is the value of the Resistor that I must add to the VCC of the VOD3120AB so that the VOD3120AB works properly?
Information ...
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1
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434
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PNP Darlington pair as a current limiter
I am trying to analyse what is controlling the load current in the below Darlington configuration.
Is it the base current of transistor Q3 which is controlling current through R14 / emitter current ...
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5
votes
2
answers
1k
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Powering Multiple Raspberry Pi circuits via GPIO header power pins
Goal: I wish to power 3 Raspi. I am currently running 3 USB C wires powering the device, but I wish to build or find ways to power them all using GPIO header power pins.
Background: Mechanical ...
- 51
0
votes
1
answer
407
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Can we add a current limiter circuit to LM2576 fixed voltage version?
I know I can add an external current sense and comparator circuit to the feedback pin of LM2576-ADJ version to limit current, but can we make such a modified arrangement to a fixed version of the ...
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votes
1
answer
246
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How to spread a current spike?
👋 I have a 12V circuit powered by a 'smart' power supply feeding two USB sockets (similar to this one). The two sockets are parallel to each other and in series with a simple switch.
Whenever I ...
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1
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58
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Voltage output on current regulator drops when I power ammeter via same power supply as circuit
I am running this cheap ammeter on a NPN transistor based current limiter. When I attempt to power the ammeter via the same power supply as the current limiter, the voltage across the current limiter ...
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0
answers
77
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How do I convert a current monitor to current limit on a power supply?
I'm designing an interface PCB for an Advanced Energy Ultravolt E series high voltage power supply, which has a voltage set input and a current monitor output. Because of the possibility of arc ...
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3
votes
1
answer
137
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Operation of the current limiter circuit
I have been trying to understand the current limiter circuit design. I am having problem decoding them. Could anybody help me understanding this circuit?
Here I_VCC_AUX is 12 V and R247 comes from a ...
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1
vote
0
answers
134
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Limit inrush current after emergency stop relay
I have a power board with an emergency stop (using a mechanical relay). The input voltage is 24V and on the power board I have multiple DCDC converters, some before the emergency stop and some after. ...
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1
vote
0
answers
432
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22V 2A current limiter circuit
I need to build a simple circuit to limit the current of a 22-25V input (from two car batteries) to 2 amperes - to avoid frying a battery charging circuit.
I found this one - "General Purpose&...
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1
vote
0
answers
113
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Power Supply for PIC32
I'm working on a PIC32 design and am looking at the power supply. Currently I have a solution in mind as below.
...
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0
answers
152
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Trying to understand why voltage supplies have high in-rush current
I have a pair of buck switching converters in a circuit, the LM2673 and the LM2679. However, the LM2679 is being used in a buck-boost configuration as shown in this app note, AN-1157, and I'm ...
1
vote
2
answers
119
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Can a DC CC power supply be used for current limiting in a circuit with a battery in series
In circuit #1 I showed typical adjustable power supply usage it can limit voltage and current, all good.
It got me thinking. Let's say due to some reasons I can't replace battery with a power supply ...
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0
votes
2
answers
1k
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Current limiting range on LM723 (from 0 to 5A)
I am building a power supply with LM723 and my intention is to have 0-30V and a range of 0-5A variable. I am regulating voltage normally, however for current limiting, if I want to regulate small ...
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0
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28
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LED circiuit for a current limited circuit
I have the following requirements for a circuit:
The circuit is supplied from a 500mA current limited voltage source
The circuit should indicate the status of the supply, i.e. if it is in current ...
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6
votes
1
answer
3k
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LED strip hot / drawing more current than expected
I am trying to wire some LED strips but they are getting a lot hotter than expected. I have noticed that they are also drawing much more current than expected. I am going to show what I've measure ...
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2
answers
104
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Calculation of max possible current load from voltage multiplier connected to PSU 12V rail [closed]
today I found in a box a PSU with two 12V rails each delivering 17A (Fortron SAGA II 400W) and decided to step-up the voltage so can feed the DPS5020-USB DC-DC converter (rated at 60V/20A max output). ...
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1
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171
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LED current source safety margin
I have a power LED that requires 600mA at around 25 Volts. Since there are mainly 24 Volts and 36 Volts power supplies available on the market for a reasonable price, I needed to choose a 36 Volts ...
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1
vote
1
answer
803
views
How to limit current while almost keeping voltage same
I am supposed to design a power supply to a project. I have 3 alternative power supply designs for this purpose. However, one of them sucks huge current while giving enough current. My design is given ...
3
votes
1
answer
586
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Combining non-isolated switch mode power supplies in parallel into a single supply
I'm trying to combine several SMPSs each having a ~350VDC output @100mA each.
Background:
Purchased an unused batch of small DC->DC SMPSs in good industrial quality. Unfortunately they're too weak ...
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4
answers
4k
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Understanding DALI power supply
I am working on a DALI system and I came across this schematic for the DALI power supply in a Microchip app note AN1465:
It says the power line can be 12-20 Volts but the current has to be limited to ...
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votes
2
answers
394
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Trying to come up with a overvoltage overcurrent reverse polarity protection circuit, is option 3 done right?
I´m reading for the past week about P-Channel mosfet reverse polarity protection circuits.
Then I´ve found this post
http://kaktuscircuits.blogspot.com/2014/07/reverse-polarity-and-overvoltage.html
...
- 111
0
votes
1
answer
766
views
Raspberry Pi Zero - 5 VDC output current?
I was planing on using a Raspberry Pi Zero W for a smart lamp project with WS2812b LEDs.
To avoid needing a separate power supply for the LEDs, my plan was to power the LEDs from the +5 VDC on the RPI ...
- 697
1
vote
1
answer
4k
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What to consider when powering multiple devices in parallel?
Briefly about my background, which might inform the question. I'm currently self-educating myself on some electrical engineering on-the-job. I'm learning from Art of Electronics and some other ...
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0
votes
0
answers
45
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TPS562208DDCT current problem
I have attached a PSU design which I have created. The input voltage is between 12 and 24V DC.
The first stage creates an isolated output voltage of 7V that is then fed into the two TPS562208DDCT (...
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1
vote
1
answer
3k
views
Limiting current to 20A with 48V in
I'm an electronics newbie and I need some help/advice with a project.
So basically I need to make a sort of programmable power supply module (or at least that's what I think I gotta do). I got a DC ...
- 13
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votes
1
answer
100
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Why does the high Side Current Shunt monitor fault as soon as power is on
The high side current shunt monitor fault goes high as soon as power is turned on preventing the P-MOSFET from turning on, its not faulting because of over current but as soon as the Enable signal ...
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1
vote
3
answers
2k
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Series inductor to limit motor current?
Short question: Would it be possible to use a series inductor to limit the inrush current when switching on (or briefly loading) a DC motor?
Longer question: I have a battery-powered motorized toy ...
- 13
1
vote
1
answer
72
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How to limit current on parallel outputs from a power supply?
So I am trying to make a USB power dock for multiple devices. I have a 5v 20A power supply.
If I connect 10 USB ports in parallel, is there a way to cap their current to 5v 2A?
I don't want to fry my ...
- 41
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0
answers
169
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Theory of Operation for Arc Lamp
I am attempting to power an arc lamp (which I have) using a programmable power supply (which I have yet to source.) Though the lamp is rated at 1000w (37v at 27A) I would like to power it at about ...
- 111
0
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1
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180
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What values of components to use in this 30V-2V, 3A(max) current limiting circuit?
I'm looking for a current limiting circuit for my lab bench PSU, and found this one.
What are the values for the components? Is R_sense the pot?
Thanks in advance!
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854
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Adjustable L200 PSU Help
I want to build myself an adjustable bench power supply with adjustable current limiting, mainly for fun but also because I want something to help me with prototyping. I have previously built small ...
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3
answers
2k
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Switching circuit for driving LED at different current values
simulate this circuit – Schematic created using CircuitLab
Above schematic is for limiting current to 4A when battery is connected to LEDs.
Datasheet of LED(BXRA-56C5300H 50W) are 23.5 Vf and 2....
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1
answer
3k
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MOSFET Based Current Limiter
I know this question is not new, in fact I learned the basics of this circuit from sites including this one. However I am planning on making a PCB with it and do not have the luxury of multiple ...
user56054
0
votes
1
answer
65
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Stepping down voltage
I have a LiPo that is 1800mAh,25C,11.1V. it can supply a current of 1.8*25 = 45A. I need a current of 3.5A to drive a LOAD(a Nichrome wire of length 5-6cm) and 7.4V. How do i proceed with this ?
I ...
