Questions tagged [inrush-current]

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

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35 views

Preventing Raspberry Pi Zero from rebooting due to inrush when device plugged in

I have a Raspberry Pi Zero 1.3 and a standard USB OTG unpowered hub. When I plug in certain USB devices, the RPi reboots instantly. I believe this is due to "inrush": https://www.raspberrypi....
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75 views

DC-DC boost converter resets mcu

Edit: A p-channel mosfet to keep DC boost circuit separated from main circuit until its charged worked like a charm. I'm trying to build a DC-DC boost converter, controlled by a 200kHz PWM signal ...
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27 views

NTC thermistors for industrial applications

Are NTC thermistors appropriate for limiting inrush on heavy load AC and DC motors (10-20 A)? What are some of the benefits and drawbacks of using one for an industrial pump? I am asking because I ...
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57 views

Is there something called as inrush current at the output of the DC-DC regulator or LDO

I am using this LDO to step down from 14V to 5V with a maximum output load current of 150mA. The above is the schematic of my LDO. I want to measure the inrush current of the LDO. But since I have an ...
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3answers
44 views

Using thermistor vs. soft starter for motor

What is the advantage that complex soft starters give over NTC thermistors if one is only trying to get rid of inrush current spikes?
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Zero crossing solid state relays

For zero crossing relays, does the switching at zero current only limit voltage spikes, or does it also reduce inrush current?
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43 views

Unsure if motor starter (contactor + overload) is needed instead of normal solid state relay

I am designing a system with several pumps ranging from 0.5 to 1.5 HP (all single phase) and am unsure of what kind of circuitry I need. I researched different motor contactors and overloads I could ...
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2answers
297 views

Custom 25 A mains inrush current limiter design review

I've designed an inrush current limiting circuit and would welcome a review from experts with more experience with this sort of thing. The load will be around 50 x 19 VDC @ 3.5 A linear power supplies ...
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2answers
31 views

Adjusting overload relay for single-phase motor [closed]

For an overload relay on a magnetic starter, what should the overload current be set at? I'm not sure whether this should be set to the rated running current of the motor, or an approximation of the ...
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82 views

Does PWM take care of inrush current

If gradually increased from 0 to 100 duty cycle, does PWM on its own take care of inrush current in a motor drive? simulate this circuit – Schematic created using CircuitLab
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73 views

Soft starter for centrifugal pump [closed]

Do most manufactured centrifugal pumps come equipped with soft starters, and is it a good idea to invest in one if they're going to be frequently switched on/off?
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69 views

Which is worse for a relay? High inrush current or large voltage difference between the relay contact and the signal being switched

simulate this circuit – Schematic created using CircuitLab I am working with a high voltage relay (Cynergy3, DBT72410) to discharge a 70 uF capacitor charged to 4 kV using a string of resistors ...
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lt4363 - 2 Surge Stopper: Shutdown / MOSFET Gate and Vout

Good day everyone I am currently working on the board which uses a Surge Stopper LT4363-2. Without LOAD the circuit works fine but once I use LOAD and force a SHDN to low with a Temperature sensor The ...
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4answers
123 views

Decoupling capacitors inrush current

My question relates to decoupling capacitors on power input rails. I see a lot of designs with MCU boards that use only decoupling capacitors and no chokes, beads, inductors, or resistors. Isn't this ...
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86 views

What is the result of deviating from the Kelvin layout when designing a current sensing PCB?

For a two terminal current sensing shunt resistor with a layout that deviates from the symmetric Kelvin layout, what results should be expected? For example, with this layout, what result would be ...
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1answer
60 views

Need help understanding the mosfet trailing edge Dimming

I am working on a circuit to control AC loads up-to 1.5KW by using Mosfets(FCHD125N65S3R0-F155) Circuit is I have few concerns The current is flowing through the body diode of Q2 for positive half ...
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1answer
34 views

Energization angle of a transformer

I am trying to understand transformer behavior for a project that i am currently doing. I am trying to simulate characteristics of transformer using simulink models. In the various papers that i have ...
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3answers
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DC Relay overrated for max. 100ms

In my case I need a relay to switch continous 0.5A at 24V DC, but in time of closing the contacts there will occour an inrush current from the further circuit of 6A, but only for max. 100ms because ...
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70 views

Why the Inrush current increase with decreasing voltage?

Here are the voltage and current shown for the primary winding of a transformer or an ideal inductor when the voltage is sinusodial. My question is why the current is increasing when the voltage is ...
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1answer
60 views

Inrush current of high voltage power supply

I have seen some solutions for inrush current, but my case I think it's a little different. The point is that I need to limit the inrush current of 1500 volts peak rectified. In my project I need to ...
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58 views

Inrush current limiter resistor power dissipation calculation

Theoretically, I have read and understood that during the initial start-up of a circuit, the circuit will draw high current (known as inrush current), so as to charge the capacitors in its direct line ...
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1answer
30 views

P-MOS Gate-Source Threshold Voltage drop (Along with inrush current limiter)

I am having a circuit which I have tried to simulate and understand the working. Circuit parameters : Zener Breakdown voltage = 6.2V P-MOSFET Vgs threshold voltage = 1.5V Inrush current limiter = 3....
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3answers
64 views

Inrush current from DC motors causing Arduino to reset

I've got an Arduino controlling a relay. The relay controls two small DC motors. All of these components are powered through a 9v power regulator. I need the power regulator because the power ...
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1answer
56 views

Rectifier Design with Regulators Surge/In-Rush Currents

I'm attempting to design my own rectifier circuit to output a positive and negative voltage as shown in the circuit below. I'm running into some concerns regarding the smoothing capacitor choice and ...
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3answers
88 views

Why there is a high inrush current when the microcontroller start-up(CC430f5137 from TI)?

simulate this circuit – Schematic created using CircuitLab In my application, I need to measure the current consumption of the mcu (cc430f5137). To measure the current of the mcu. I insert a ...
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97 views

How to choose NTC thermistor?

I would like to make a siren on an UPS backup. I used this board with an 18650 embedded battery: https://www.aliexpress.com/item/32911096857.html?spm=a2g0s.9042311.0.0.24db4c4dn31JsH And this siren: ...
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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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1answer
69 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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2answers
942 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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1answer
106 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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187 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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514 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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2answers
94 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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1answer
98 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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50 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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147 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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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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88 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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232 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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3answers
112 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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189 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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1answer
43 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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232 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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3answers
528 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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1answer
53 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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2answers
324 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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1answer
47 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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221 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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1answer
526 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 ...