Questions tagged [inrush-current]
The high current, that often occurs when first plugging an appliance in the power supply.
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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
39 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
44 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
53 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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18 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
89 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
176 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
93 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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56 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
41 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
43 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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81 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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0answers
53 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
69 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
35 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
102 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
186 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
168 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
153 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 ...
2
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1answer
180 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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79 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
70 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
107 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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44 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
351 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
32 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
153 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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2answers
108 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
76 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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0answers
32 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
201 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
98 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
74 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
39 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
1k views
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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2answers
109 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
69 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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2answers
368 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
52 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
129 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
60 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
127 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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1answer
126 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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71 views
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
117 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
2k 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 ...
0
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1answer
146 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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2answers
315 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 ...
