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Questions tagged [soft-starter]

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I have to charge a bulky DC link capacitor (3000 µF, 400V). I am trying to limit the inrush current and ramp up the voltage in a soft-start manner by using a pre-charging circuit centred around a ...
ankit kumar's user avatar
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Background We're building a kind of a "power distribution" PCB, which feeds into many independent DC-powered submodules. The submodules are BLDC drivers, lighting, heating controllers with ...
anrieff's user avatar
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For the part described in the following datasheet, what is the maximum expected current through the GND pads? https://www.onsemi.com/pdf/datasheet/nis6432-d.pdf I am not sure where in the datasheet to ...
Hammdist's user avatar
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I was trying to simulate including P-channel MOSFET like below. Simulation Tool: LTSpice 24.1version Almost Input reverse polarity protection circuit, which used PMOS, connected the Drain to Input ...
Sanghun Kim's user avatar
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I try to power a strand of 50 variable voltage 8W LED bulbs (meant for boats and caravans) accepting 12-24 V DC by a 24V LED power supply providing up to 25A - so we have some margin on the 15A ...
dronus's user avatar
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I want to insert a circuit between 350 mA constant current driver and 36 V COB chip to get soft start and soft close effect with high durability. Can someone suggest or make a circuit diagram for me ...
Mufaddal's user avatar
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2 answers
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I have been struggling with an issue where the TPS25921x eFuse IC trips into fault mode when powering an LMZ12002 DC-DC converter. Both devices feature soft-start functionality, and I suspect an ...
Vincent Free's user avatar
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1 answer
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My dehumidifier is switched on using a touchpad which controls its startup sequence. If I plug it in and supply current nothing happens until I turn it on using the touchpad. So I cannot cause it to ...
Silvosa's user avatar
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Question: I need to understand the differences between the two motor-starting methods: Case 1: Start with a Star connection and then switch to DOL (Direct-On-Line) [I know this is not standard ...
kautuksahni's user avatar
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I am a beginner level EE working for a small company. There is a three-phase (whose only two are controlled) soft-starter project (for 1/4CV motors) that has never worked as intended. The company ...
Clóvis Fritzen's user avatar
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1 answer
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I want to create a hardware solution. The datasheet is here. The circuit is shown below. I do not have access to the code in order to implement a soft start using a PWM. Is there a way I can create a ...
JoeyB's user avatar
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What's going on with this motor ? It's not simply wired into a star/delta starter. There's a 3rd option I'm not familiar with. The legend below and to the left shows Star/Star-Star/Delta.
hareti's user avatar
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I am trying to design a soft-start circuit for one of my projects which has a relatively large resistive load (~1MOhm). I found the following example circuit from an answer for a previous post (12 V ...
Curious's user avatar
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1k views

Still learning about electronics. I want to build a soft starter circuit, I found this schematic.soft start schematic I can understand the schematic, but there's a 7805 voltage regulator circuit at ...
Stu Boyd's user avatar
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0 answers
107 views

I am using a pickup truck starter motor to build a small crane-like loading arm. I want to control the direction of rotation using an H-bridge, however, when I turn on the mechanism the motor has a ...
R Ram's user avatar
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2 votes
1 answer
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This is the question I am trying to solve: A delta connected fully loaded induction motor draws 90A from a 400V supply when started direct online. Show by calculation the current at start up that the ...
Claude Leicher's user avatar
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1 answer
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I'm using a RFPA5542 PA module. Does the power on/off sequence have to be followed exactly? Do I risk damage to the IC? I am delaying PA_EN by 2ms by an RC circuit of R13 and C5 and that is all. The ...
thegamebusterpl's user avatar
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0 answers
272 views

I want to build an AC motor soft start. The way I found is to regulate the voltage from 0 to 220 V (within 2 seconds) to eliminate the inrush current. I did it using Arduino to generate PWM to drive a ...
jihad.khorfan's user avatar
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1 answer
248 views

Although this question sounds basic but, I have been trying to implement this precharge circuit to safely turn on the inverter without overloading the system, however especially when I powered it on, ...
Hazardous Voltage's user avatar
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I have a Pi Pico project I am working on and I ran into a hiccup. I have a 12VDC soft start that I used from this thread. I pretty much used the same thing, but I changed the MOSFET to IRF9620 . I am ...
peterman's user avatar
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5 votes
2 answers
11k views

I'm struggling designing a soft-start circuit for my project. It's 12 V with up to 500 mA load. I'm looking for a ~1000 ms ramp-up time from 0 to 12 V. This is the circuit I have designed, which seems ...
Maciej Swic's user avatar
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1 answer
184 views

I need a soft start for a ups transformer. Because when I power it with 230v ac it trips the breaker. I need a diagram to build my own soft start circuit.
sylivanos oketcho's user avatar
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A circuit to soft-start, a.k.a. slew-limit, the charging of a 220 uF capacitor Cf at a maximum current in the neighbourhood of 300 mA. Cf is a filter cap preceding a further SMPS stage. My plan so far ...
Reinderien's user avatar
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1 vote
1 answer
752 views

I have a soft start circuit that looks like so: The load will actually be a synchronous boost/buck converter, and ultimately this could also have an AC source instead of just DC and have a rectifier ...
James Hancock's user avatar
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0 answers
188 views

I am working on a soft-start for a capacitive load. I using module QSB40024S24 to create 24V output. At first, I allowed the output of the module to connect directly to a capacitor array (21.4mF in ...
Lan Tran's user avatar
  • 43
4 votes
2 answers
1k views

I am currently working on a soft-start circuit. The picture below is my schematic. It worked fine in simulation and even in a real circuit. But after several times, turn on and off the power source (...
Lan Tran's user avatar
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1 vote
3 answers
351 views

I have a circuit with a not-so-small capacitor on the supply and I need to reduce the inrush surge; as a matter of fact the power supply breaks after a while (these cinese supplies are not fun) I ...
Lorenzo Marcantonio's user avatar
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137 views

By chance of my research and simulations and various tests, I found the diagram of an oscillator with strange behavior. All the oscillators (quasi) that I have encountered work whatever the supply ...
Antonio51's user avatar
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2 votes
3 answers
632 views

IMPORTANT UPDATE (Update 6), scroll down to see. I have been trying to make an AC (air conditioner) soft starter for my home AC unit. I have built the following circuit and connected it to my AC unit ...
Oli's user avatar
  • 107
1 vote
0 answers
169 views

I want to make a soft starter for 3 phase induction motors. TRs are SCR pairs and ZCs are the zero-cross timing respect to line voltages (400V), not phase voltages (230V). I control the firing angle ...
MP3's user avatar
  • 11
0 votes
0 answers
289 views

i want to make a soft starter for incandescent lamp. i have seen some magical dimmer or Russian soft start device which are not available near me. i found some diagram of the Russian soft start device ...
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2 votes
1 answer
1k views

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 ...
Elkvis's user avatar
  • 121
2 votes
7 answers
10k views

I live in an off grid property running on 6 12 V batteries. We have a 2000 W inverter and are trying to get a fridge to run on our system. We have enough power to run it, however the issue I am having ...
Nectar-Bomb's user avatar
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