Questions tagged [soft-starter]

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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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Is this output signal good to drive a thyristor gate?

I have the following signals: Blue is the input to the 10ohm resistor connected to the gate of the 2N7000 transistor Yellow is the output of the pulse transformer GG3 and K3 Is the output of the pulse ...
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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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4 votes
2 answers
221 views

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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1 vote
3 answers
87 views

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 ...
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3 answers
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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 ...
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1 vote
1 answer
344 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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