Questions tagged [soft-starter]
The soft-starter tag has no usage guidance.
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Is the RF/DC power on/off sequence for my simple radio beacon design good enough?
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 ...
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Soft starter for AC motors
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 ...
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Why is this precharge circuit not functioning?
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, ...
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Wrong output with DC soft start
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 ...
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12 V Soft-Start circuit
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 ...
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Why do some transformers trip circuit breaker. Eg a ups transformer. I need a soft start resistor details
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.
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Design or selection of a capacitive-load soft start circuit
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 ...
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Control PMOS or NMOS for Soft Start with Variable Voltage Source (Battery or known series string of solar)?
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 ...
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Soft-start design and performant with short-circuit test
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 ...
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Soft start circuit problem
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 (...
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Inrush control transient at power on
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 ...
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Why does this oscillator not work with a voltage less than 9 V?
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 ...
- 12k
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TRIAC keeps failing
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 ...
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3 phase controlled soft starter and motor vibration
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 ...
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Soft Start for AC incandescent lamp
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 ...
user284562
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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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Soft start for fridge compresser [closed]
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 ...
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