Questions tagged [inrush-current]

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

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2answers
53 views

Improving this circuit from Texas Instruments note (inrush current)

this is an example circuit in this PDF from TI. (page 19, inrush current stuff) Description : In steady-state operation, Q1 is fully turned on and load current flows through the series sense ...
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1answer
60 views

Would sparks from connecting power adapter to DC jack cause issues to a circuit?

When connecting a power adapter (19V) to a circuit through a wall mount DC jack, I get these sparks. Would this cause any damage to the circuit, and if so what would be the solution other than not ...
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87 views

Limiting the Inrush current of the Boost converter device?

I have a source of 24V and I cannot draw more than 2.4W from the same. This means I cannot draw a current more than 100mA from this supply. Alongside boost converter, it also has some other circuits ...
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37 views

High-side mosfet switch placement

this is a power circuit I'm trying to complete: the button at top turns the curcuit on, supplying VCC to mcu, and the MCU will output a high signal to a pin (marked in pink) which turns the N-MOSFET ...
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1answer
60 views

Super Basic Inrush limiting for super capacitors

I have 6 x 500 farad super caps in series. I want to use them to smooth voltage dips in a 12v system that is powered by a DC-DC converter. Currently my application is a water pump (desalination) ...
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72 views

How to limit Inrush current from a DC motor?

I'm new to this platform and knows very little about electronics. Please forgive if any of this is dumb. I wish to create an inrush current protection for my L298N Motor Driver, which drives a 7.5V DC ...
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2answers
91 views

Using supercapacitors on DC-DC converter output for high in-rush current

I have a motor that draws a max continuous current of 60A, but has a peak in-rush draw over 120A for a few milliseconds. I want to power the motor using a DC-DC converter. I purchased a converter that ...
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1answer
84 views

Solid State Relay for Large Inductive Load

I have an old, transformer-based welding machine, which is rated to draw about 70A at 240V, at full output. It uses an electro-mechanical relay (contactor) to energize the main power transformer, and ...
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1answer
78 views

Why do European motorized appliances draw less inrush current than their American counterparts?

I have been trying to tease apart the history and evolution of arc fault circuit interrupter requirements, and in the process, came across a curious historical sidenote early in its genesis, namely ...
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1answer
63 views

Why would a multimeter (ammeter) connected in series prevent the instrumented device from powering on?

I'm trying to measure the current used by a 3.5" hard drive in an external enclosure. I connected my multimeter in series with the positive 12V power supply, but in doing so, the hard drive ...
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59 views

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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26 views

Duration of inrush current for high pressure sodium lamp with electronic balast

I'm trying to find reliable information regarding the duration of inrush current for high pressure sodium lamps with electronic ballasts. This document states that: "In reality, due to the ...
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1answer
65 views

Hot-plugging power kills switch-mode converter

We have a small IoT device, that runs of an external 24v DC power supply brick (https://www.rapidonline.com/tt-electronics-t6367st-24vdc-60w-installation-smpsu-85-3795) This 24v supply connects to the ...
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1answer
55 views

Smart load switch with inrush control and overvoltage lockout

After I finish making my dc-dc buck-bost converter, voltmeter and ammeter I decided to add a smart load switch to my power supply in order to have the posibility to connect electric motors, bulbs or ...
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58 views

The right fuse (inrush current problem )?

Hello Electrical Engineers, just a quick question I need to get a fuse between the mains voltage (120V) and the adapter. I know that the load will draw around 30mA and has an operating voltage of 24V. ...
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1answer
46 views

Transistor current limit

Suppose the DC motor has a peak current of 500ma and after that it drops to 100ma, the transistor can switch continuously 200ma. If I limit the current of the transistor from the base current to 100ma,...
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1answer
68 views

Inrush current in the Boost Converter during start

I am making a 400V 1kW boost converter but in the LT-SPICE simulation, it is drawing a huge current of 50-60A at the start for 1ms-3ms, but the current comes down to 12A after that. The inductor ...
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1answer
101 views

ESP32 stalls b/c of current spike (inrush current) - how to limit inrush current?

I have a circuit with several neopixels and an ESP32 MCU running with micropyhton. Under full load, the circuit including the ESP32 draws around 200mA at full load. Now I'd like to add another ...
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23 views

How to measure inrush DC current in PV solar system?

I need to measure inrush DC current in PV solar system. Can I do that with a clamp meter?
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2answers
100 views

High current problem

I have this circuit: I was asked to measure the inrush current for this circuit section. One floating output actually goes to a microcontroller input and the other goes to an op-amp input terminal. ...
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1answer
200 views

Find the inrush current in the capacitor [closed]

How can I find the inrush current value of the capacitor in the following circuit: simulate this circuit – Schematic created using CircuitLab When \$R_1=R_2=10\$ and \$L=10mH\$ and \$C=1\mu F\$ ...
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1answer
120 views

Voltage drop on lithium batteries

Is there a difference between having one big battery vs 2 batteries in parallel? I am building a "fan controller" and want to power a 12V fan with a lithium ion / polymer battery. The ...
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101 views

how to protect a dc-dc converter (LM2596) and an Arduino from Inrush current

I am fairly inexperienced with electronics so please bear with me. I have an Arduino Nano 33 IoT being powered by a battery pack which at 100% outputs 40.2V and at 0% outputs 36.5V Since the Max Vin ...
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1answer
60 views

Do I have to deal with inrush current for my AC/DC converter?

I am having a question about inrush current for a simple AC/DC converter. I am using a transformer from 230 to 36 V,followed by a full bridge rectifier and a filter capacitor of 1000 uF 100V. When ...
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1answer
53 views

Does turning on inductive load (ex. AC motor) at peak input voltage reduce inrush current?

I was checking out the following project on hackster and at some point the author claims that When the load is predominantly of inductive type, the turn-on is performed at the peak of the input ...
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89 views

Opamp output voltage spike and swing due to DC heater

Turning on the heater introduces a voltage spike and voltage swing on my 3.3V regulator and this causes a transimpedance amplifier output to be wrong. Every time the heater turns on my 3.3V regulator ...
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30 views

What breaker should I use to protect downstream?

I have a 16A supply connected to a junction box to split into a 16A feed and a 13A double socket. The issue is the 16A is connected to a load that will have high inrush current. I have protection for ...
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80 views

SMPS powered DC motor inrush current problem

I stumbled upon a problem when connecting a DC motor to a SMPS. It's a 20W AC/DC converter with an 12V output that powers some 12V DC motors the processor and some LEDs. I needed to speed up the most ...
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1answer
85 views

Protecting ADC Input inrush current

I'm currently using a 5V current transducer that's connecting to an I/O device ADC input. I'm trying to protect my ADC input from going over 5V by using a zener diode . The reason this is coming about,...
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1answer
39 views

NTC Inrush current limiter datasheet

I have been looking at B57238S0100M0** NTC which is rated with R25 = 10R I_max = 5A R_min = 0.16R I already inspected the resistance vs temperature curve and it appears to be straight forward. ...
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2answers
277 views

Verifying schematic ideea: Circuit design for mosfet driven by ESP32

I have an ESP32 that I will use to drive open a solenoid valve. The Mosfet I will use is a IRLZ44N which is best operated at <...
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1answer
266 views

Energy efficient inrush current limiting

Short version: looking for simple and energy efficient way to limit capacitive inrush current. Primary design goals are to minimize radiated heat and current draw during normal operation. The ...
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1answer
243 views

Inrush Current Depends on the Power Supply Rise Time

I have a query. I understand that the inrush current is the current that appears during the initial turn ON of the Board so as to charge all the Capacitors present in the board. But I think that, this ...
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1answer
273 views

Instantaneous Current (Inrush) Calculation

How is the instantaneous (inrush) current calculated for the capacitor in this circuit? Both Falstad Circuit Simulator and LTSpice give the same answer for inrush current (500 uA). LTSpice Falstad ...
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1answer
321 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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86 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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1answer
92 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
220 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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49 views

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
431 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
39 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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2answers
256 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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183 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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1answer
81 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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62 views

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
278 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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2answers
117 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
105 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
43 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 ...