Questions tagged [inrush-current]

The high current, that often occurs when first plugging an appliance in the power supply.

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how to proteus simulation inrush current

i've a reverse polarity protection , i want to check inrush current simulation , but i don't know how . i read this , but i tried but doesnt work How to plot voltage vs current graph on Proteus ...
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53 views

Reverse Polarity in rush Protection 2 p fet parallel

after reading those links : Reverse-polarity protection P-channel MOSFET Optimal method for multiple MOSFETs for LED driving with a shared power rail Parallel MOSFETs and this pdf : ...
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126 views

How to calculate transformer inrush current?

I have a transformer with 220 V primary and three secondaries; 1. 24 V | 1.2 A 2. 24 V | 600 mA 3. 12 V | 200 mA Each secondary have 4400uF capacitor and 100mH ...
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66 views

Proper inrush current limiter 50A universal motor

We have one dental equipment with one universal motor  in 2000W and 220V range shown below: And we gave two corruption in selled device to customers which have inrush current problem by switching ...
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115 views

Can I use a Microwave Capacitor as a Motor Start Capacitor?

Recently I had a garage door opener stop working and it was replaced. I decided to take it apart and realized the capacitor had blown a hole in itself. The motor, despite being about 20yrs old, seems ...
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359 views

Limiting the inrush current

I have a transformer with several secondaries, and this is how I'm planing to control the inrush current: simulate this circuit – Schematic created using CircuitLab I'm using a resistor to ...
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70 views

How many inrush current limiting thermistor do I need and where should I place them?

In most designs they place a single NTC thermistor in series before the bridge rectifier and in some two or four: simulate this circuit – Schematic created using CircuitLab Isn't a single ...
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58 views

Lab power supply with motor startup spikes (inrush?)

I want to buy a lab power supply. However (30 V, 5 A). However, when a motor starts (inrush it's called afaik), it uses extra current. But I don't know really how much this typically is. Or if there ...
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35 views

SMPS inrush time

In the datasheet of the smps supply, I have found that the inrush current of the supply is 40A. But the time period of the inrush current is not provided in the datasheet. Is there any way to find the ...
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92 views

Is Inductor peak current same as the Inductor Inrush current

I am using a DC-DC converter which is having an inductor rating of 68uH and 2.05A. Output Voltage of dc-dc is 23V and output current max is 300mA Schematic : I am using a current probe and ...
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85 views

Why does this current inrush circuit not work well?

I've done some research and tried to implement a resistor and relay combination to limit current inrush for my power supply. How can this be improved as I am still seeing a peak of 85A at the ...
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914 views

P-Channel MOSFET Inrush Current Limiting - Transistor burn issue

I'm fighting with PFET inrush current limiting circuit discussed here: P-Channel MOSFET Inrush Current Limiting In my circuit is input voltage 24V DC and C_Load is 6mF. I'm switching on transistor ...
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70 views

How to prevent voltage droop when discharging a battery?

This is quite an open question, so apologies in advance if you would rather schematics and the like, if you really think this would help I can provide them My problem: boosting from 2x AA Li ...
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122 views

Switch mode power supply inrush current protection

I want to design a suitable PCB for my audio amplifier project. The amplifier boards (both left and right channels) will use almost 4 amps at 24 V at full power. I want to use a switch mode based ...
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93 views

WS2812 high inrush current in big installation

I have a "big" installation with WS2813 (WS2812b successor) LEDs. The installation encompasses over 350 LEDs which should consume about 21A if all powered on, which should never happen (it's a simply ...
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85 views

Does an ac servo motor experience high “inrush current” every time it moves after initial power up

we are currently building a motion platform for an airplane simulator and the linear motion actuators will be driven by 6 servo motors of type: Syntron 3KW AC 380V 130HMB-30100. The datasheet says ...
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42 views

What would happen to the turn-on transient if I add a capacitor in parallel to a transformer?

I have a welder with a big air gapped transformer. Input specs: 220V, 3200 W active, 25 A total (cos Phi 0.56). Output specs: at full load 110 A welding current. I haven't checked whether output is DC ...
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216 views

Why does my Inrush Current Limitation not work sufficiently?

I have a battery powered application and want to somehow "protect" the battery from seeing too high currents. For that I have introduced a serial resistor to limit inrush current. After a certain time ...
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267 views

Voltage Drop due to inrush current

When an air-conditioner is switched on, light bulbs in the house flicker a little. I was told that this is due to the inrush current of the ac. I am assuming that voltage drop is causing the ...
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46 views

Inrush control circuit

I am analysing the an eval board circuit for a battery charger IC which has the following inrush control circuit. Question 1: I understand that C22 is used to "slow start" Q6 limit inrush current ...
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284 views

Inrush current limiting circuit for a 1.5 MW transformer

I am looking for help with an inrush current limiting circuit for a 1.5 MW transformer as of now the current can reach as high as 10 - 15 kA. I would like to keep the current under 1800 A per phase ...
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39 views

Limit in-rush current for DCDC

We are using a Isolated Fixed-Ratio DC-DC Converter from Vicor (http://www.vicorpower.com/documents/datasheets/ds_BCM4414xG0F4440yzz.pdf) that is powered through a 600VDC accumulator. The DCDC powers ...
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113 views

24-60V Precharge schematic critique

I'm looking to design a soft-start precharge circuit for starting up circuits with substantial input capacitance (~1.5J @ 24V). The main requirements are: 24-60V compatible Constant current pre-...
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295 views

Switching Power Supply - Type of MCB for Inrush Current

it's regarding this PSU from Mean Well: https://www.meanwell.com/Upload/PDF/LRS-350/LRS-350-SPEC.PDF It has a 60A inrush current. My lighting circuit (1.5mm2 wiring) is tied to this PSU supplying ...
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96 views

Switching Power Supply - Inrush Current, Input Current, MCB

I am getting several PSUs (LRS-350-24) from Mean Well. Here's the specs: https://www.meanwell.com/Upload/PDF/LRS-350/LRS-350-SPEC.PDF 1) The input current is stated to be 3.4A/230VAC at 88%. 350W ...
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How to choose a DC-DC Converter for a motor with inrush current? (Theory)

I am wondering how to choose a DC-DC converter for a motor. This is a theoretical question for understanding. For example, if I have a converter that can output 5V with a maximum current of 1A. ...
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319 views

Cheap alternative to limit inrush current (eg. relay bypassing a fixed resistor or MOSFET)

I'm editing the question because several (great) answers focus on the fact that the LTC3780 module (inside ajustable my power supply) can handle the inrush current (maybe, maybe not). I'm glad to know,...
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127 views

Inrush Current problem?

I have a 360W 36V Switch Mode PSU which I am using in a garden lighting system I have designed. I'm in the UK so it's running off 240V therefore can supply about 10A. Each section of the ...
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155 views

Choosing inrush current limiting resistor for a mains rectifier

I am having a trouble with a mains rectifier. Simplified schematic: simulate this circuit – Schematic created using CircuitLab Only problem I have is that R1 sometime explodes during circuit ...
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112 views

AC “chopping” power supply inrush current problem

I've made a simple AC to DC chopping/switching power supply circuit (I'm not sure if it's called that) as shown below. in the left part of circuit (which is the gating/chopping part) when the ...
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115 views

LTM8073 integrated DC-DC buck converter issues

I have a board with two LTM8073 "silent switcher µModule regulators" by Analog Devices/Linear Technology being used to provide two separate power supplies. This is a 10-layer dual-sided board that was ...
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159 views

Chop Saw Inrush Current Limiter?

I have a Dewalt Metal cutting abrasive saw that tends to open a breaker on starting up. It draws 75A on startup tripping the magnetic part of the breaker and opening it. This circuit is only to stop ...
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160 views

5V Switching Regulator Problems

I have a circuit with two supplies. A 19v supply for stepper motors, and a 5v supply for driving the ATMEGA644, 3 stepper motor driver daughter boards, a bluetooth LE daughter board, and 2 ws2812b rgb ...
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286 views

Surge Current on PCB

When designing a PCB, do you need to worry about the inrush/surge current or just the continuous/RMS current on the board? Everything I have seen including IPC documentation is for continuous current....
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574 views

Microwave oven: How can I temporarily limit the startup load?

Problem: It's a common problem for "NON-inverter" type microwave ovens to pop circuit breakers, and mine is no exception. There could be a huge number of reasons for this. Even though I thought I ...
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83 views

How to reduce inrush current for DC Motor in boom barrier gate application?

I'm using 24V 25W 100RPM DC geared motor for boom barrier gate application.So I added an overload protection for that circuit but whenever the motor starts the inrush current is produced and it ...
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483 views

Limiting inrush current in N Channel MOSFET power switch

I have a N-MOSFET as power switch like this: I want to add a fuse on the power line but I have few capacitors on the across the load and I am worried that the inrush current might blow the fuse off....
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Inrush current limiter circuit for filament bulb - comparison

Context: A 12V power supply is switching on externally connected 12V filament bulbs. The power supply's load switch implements an electronic resetable fuse (13A/τ=15ms) in case of an external short. ...
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80 views

Inrush current into capacitor bank

Given I am charging a 50uF film cap bank to 500V. Do I need a current limiting resistor or some sort of current regulator to minimize inrush current when i first turn on the power supply and/or limit ...
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109 views

Apart from speed, do VSD's also alter current?

As I know it, a VSD alters the frequency to change the speed of a motor. I also understand that since the back emf of the rotor is directly proportional to the speed of the rotor, the slower the motor ...
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71 views

Decreasing the surge power of the AC loads

I have a pure sine wave inverter 12v to 220v AC, its continues output power is 600VA and the surge power is 1130VA, I want to running my 200W fridge, but unfortunately my fridge surge power is a bit ...
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87 views

Reducing surge current in 5V High Side Switch

Re-visiting a prior question I asked a while back. I have a circuit that looks like the following: simulate this circuit – Schematic created using CircuitLab ... and from what I surmised from ...
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2k views

MOSFET as inrush current limiter (passthrough parasitic C?)

I have a circuit based on a P-FET which shall limit inrush current (20 mA). However, when turning on the power supply there is always a current peak (30 mA, 5 ms) through the M1. Even if I tie its ...
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3k views

Choosing inductor to limit inrush current

I have a 12V DC input to a circuit. There is a 660uF Aluminum cap on the input. The 12 volt source is not in my control and can come from anywhere. So it could be a noisy source or a high current ...
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How to prevent large inrush current without a reset-fuse

In another question (DC-DC booster fails with lead-acid battery source) I described a problem with a DC-DC booster that destroyed itself by dragging a large current when its output was disconnected. ...
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How to limit starting current of a SEPIC based LED driver?

I have designed a SEPIC based LED driver which gives 60 V, 350 mA constant output with a good power factor. It is connected with 220 V AC source.Then I have used full-wave rectifier.After ...
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430 views

Does Thyristor (SCR ) works for Inrush current protection?

Does a SCR ie Thyristor work for Inrush current protection in a circuit ?
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246 views

Contactor/relay rating for bypass function of soft start circuit

I am designing a soft start circuit for a 70KVA, 70A, 480/230 delta/star transformer, since the fuses kept blowing without. I've been using 3 NTC thermistors rated for 80A in series with the lines ...
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1k views

How does the high inrush relay handle the inrush current?

I was searching through the high power relays(16A, 240AC) and found that some manufacturers have high inrush capability relays and that too upto 100A inrush current. Below are some examples (one is ...
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255 views

Limiting Inrush on AC/DC converter

I created a simple power supply as shown below that results in an unregulated 50VDC which is what I desire. The transformer is rated for 1000VA. It works ... but only if you're lucky enough to turn it ...