Questions tagged [soft-starter]

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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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0answers
39 views

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 ...
4
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2answers
148 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 (...
1
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3answers
72 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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0answers
94 views

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 ...
2
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0answers
165 views

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 ...
1
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0answers
45 views

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 ...
0
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0answers
61 views

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 ...
1
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1answer
167 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 ...