Is it possible to soft start a load that cycles? As an example, plug in a DC device that runs at 18v. The control board on that device will use a relay to intermittently power a motor which on its start-up overloads the power supply. Is there a way to put something between the power supply and load such that when it suddenly tries to draw significantly more current (over 17A), it will ramp up to max without an overload startup?
I'm working on putting a electric water pump in my BMW drift car and I need a pwm that can come on softly and ramp up to full blast at a certain temp and shut off at a certain temp. I'd gladly pay you for your time and knowledge. Thank you.
Hi B Mac! Sounds like something a microcontroller would be very good at! I'd love to whip something together for you, but as we all know: one can only do so many things. :) I'm sure I can answer some questions if you decide to try building one yourself!!! On a high level, this feels like something that somebody would have made already. We're you unable to find a controller module off the shelf? Cheers, and thanks for reaching out!
@@EEforEveryone thank you so much for taking the time to reply. Yes o would love to know how to make something myself but idk if there's enough time on this planet for me to figure it out. Hahaha. Also there is a controller out there that will do what I want but it's expensive and I believe it's a proprietary controller. I could be wrong. Electrical gadgets are over my head. Metal and motors is what I'm good at. Lol. Thank you again for your time. Much appreciated. 🤘
@@bmac5315 That sounds awesome!! I'll keep you in mind, and see if I can work some tips into our upcoming content. :) Micro-controller basics if you will. If this whole world is new to you, an arduino starter kit could be a great place to start!!! Little micro-controller and some very easy to learn programming languages... If you're looking to try something a little out of your confort zone. :) Thank you for taking the time to comment! I appreciate you too.
Hello Honodijii, great question! Depends on what you mean by 'repsonse time". I tend to think of response time as how long a power supply takes to recover from a load transient (stepping from 5 to 95% load, for example). This definition of response time means that it depends on the compensation network and control loop stability, not soft-start programming. Soft start time is how long the power supply will take to transition from 0V to the output voltage while turning on. I hope this helps, and thanks for watching!
@@EEforEveryone Thanks but for me the définition of soft start time and time reponse is the same and it make me confuse. For m'y design i put tss = tr To help me to calculate the Css
i need to build something like this but for a voltage between 18-25 volts with a maximum current handling of about 25 amps. I have a bluetooth amp that has several large caps that as you said, act as a short circuit when connected to my 400wh lithium pack.
Hi Flyingwigs, Oof! That sounds like a lot of inrush current! I hope you can find a good solution... is it tripping the over-current protection of your battery pack, blowing fuses, or all of the above? :)
@@EEforEveryone no, thankfully it is not high or long enough to trigger the BMS, but it is sparking badly when connected. it was enough to make me think most switches would get fried over time. I also like the idea of using a momentary button for both on and off.
Oh yeah! Arcing can be difficult for a mechanical switch, for sure. If the inrush isn't too extreme, a mosfet or similar silicon switching device might do the job nicely! Using a mechanical switch to trigger the part doing the heavy lifting is sometimes a good option. Otherwise, a good switch with gold plating made to switch dc may last a while! Most switches that fail early fail because an ac rated switch is used to switch dc.
Hello iiisolda, Thanks for watching! There are a couple little spots without a head in the video. :) I hope you were able to learn a few things... even if we won't win any awards for filmmaking. ;)
UA-cam recommends me this video of yours which is two years ago. Oh my, Ryan! Were you on skinnier side! I mean, you were already very good-looking, it is your cheeks. I initially thought you could be practising anorexia. But you were not that frighteningly thin. I then thought you could be doing some modelling, because modern fashion industry wants slim models with slim/chiselled face.
Hi Real Chris, Oh my Indeed! I can say for sure I never hit "rock bottom" with anorexia. I'd say that I ate too little, exercised too much, and had a warped body image - A quick google search... that's pretty much the definition of anorexia. I'm very glad to say that by some miracle that's much less of a struggle these days, though to be honest I can't say why or how for certain. I just took it day-by-day, learned to be more honest about where I am rather than hide my faults, and learned how to love myself better! Big change tends to happen slowly over time. Thank you sir- it seems you are genuinely concerned for my health and well-being. I'm honored to have someone like you keeping an eye on what I'm up to!
I bet 99% percent of viewers have no idea what your talking about. We just want to buy something that works and at an affordable price. Just want a air conditioner to start up from a battery and inverter.
Is it possible to soft start a load that cycles? As an example, plug in a DC device that runs at 18v. The control board on that device will use a relay to intermittently power a motor which on its start-up overloads the power supply. Is there a way to put something between the power supply and load such that when it suddenly tries to draw significantly more current (over 17A), it will ramp up to max without an overload startup?
I'm working on putting a electric water pump in my BMW drift car and I need a pwm that can come on softly and ramp up to full blast at a certain temp and shut off at a certain temp. I'd gladly pay you for your time and knowledge. Thank you.
Hi B Mac! Sounds like something a microcontroller would be very good at! I'd love to whip something together for you, but as we all know: one can only do so many things. :) I'm sure I can answer some questions if you decide to try building one yourself!!!
On a high level, this feels like something that somebody would have made already. We're you unable to find a controller module off the shelf?
Cheers, and thanks for reaching out!
@@EEforEveryone thank you so much for taking the time to reply. Yes o would love to know how to make something myself but idk if there's enough time on this planet for me to figure it out. Hahaha. Also there is a controller out there that will do what I want but it's expensive and I believe it's a proprietary controller. I could be wrong. Electrical gadgets are over my head. Metal and motors is what I'm good at. Lol. Thank you again for your time. Much appreciated. 🤘
@@bmac5315 That sounds awesome!! I'll keep you in mind, and see if I can work some tips into our upcoming content. :) Micro-controller basics if you will. If this whole world is new to you, an arduino starter kit could be a great place to start!!! Little micro-controller and some very easy to learn programming languages... If you're looking to try something a little out of your confort zone. :) Thank you for taking the time to comment! I appreciate you too.
Is there any relationship between reponse time at 5% and the soft start time ?
I would like to design a soft start for uc3842 ic controller
Hello Honodijii, great question!
Depends on what you mean by 'repsonse time". I tend to think of response time as how long a power supply takes to recover from a load transient (stepping from 5 to 95% load, for example). This definition of response time means that it depends on the compensation network and control loop stability, not soft-start programming.
Soft start time is how long the power supply will take to transition from 0V to the output voltage while turning on.
I hope this helps, and thanks for watching!
@@EEforEveryone
Thanks but for me the définition of soft start time and time reponse is the same and it make me confuse.
For m'y design i put
tss = tr To help me to calculate the Css
If tr is your desired rise time when tuning on the supply, then that should work just fine!
@@EEforEveryone
Thanks.
tr for time reponse.
Have you already design a soft start for one SMPS ?
I Will do that by simulation to well understand.
i need to build something like this but for a voltage between 18-25 volts with a maximum current handling of about 25 amps. I have a bluetooth amp that has several large caps that as you said, act as a short circuit when connected to my 400wh lithium pack.
Hi Flyingwigs, Oof! That sounds like a lot of inrush current! I hope you can find a good solution... is it tripping the over-current protection of your battery pack, blowing fuses, or all of the above? :)
@@EEforEveryone no, thankfully it is not high or long enough to trigger the BMS, but it is sparking badly when connected. it was enough to make me think most switches would get fried over time. I also like the idea of using a momentary button for both on and off.
Oh yeah! Arcing can be difficult for a mechanical switch, for sure. If the inrush isn't too extreme, a mosfet or similar silicon switching device might do the job nicely! Using a mechanical switch to trigger the part doing the heavy lifting is sometimes a good option. Otherwise, a good switch with gold plating made to switch dc may last a while!
Most switches that fail early fail because an ac rated switch is used to switch dc.
Quallity vid as always
you completely forgot to add your speaking head from 11:18 to 12:50 - this reduces the information value of your clip soo much ;)
Hello iiisolda, Thanks for watching! There are a couple little spots without a head in the video. :) I hope you were able to learn a few things... even if we won't win any awards for filmmaking. ;)
Awesome video
Thanks for watching Theios! I'm glad you enjoyed it.
UA-cam recommends me this video of yours which is two years ago. Oh my, Ryan! Were you on skinnier side! I mean, you were already very good-looking, it is your cheeks.
I initially thought you could be practising anorexia. But you were not that frighteningly thin. I then thought you could be doing some modelling, because modern fashion industry wants slim models with slim/chiselled face.
Hi Real Chris, Oh my Indeed! I can say for sure I never hit "rock bottom" with anorexia. I'd say that I ate too little, exercised too much, and had a warped body image - A quick google search... that's pretty much the definition of anorexia. I'm very glad to say that by some miracle that's much less of a struggle these days, though to be honest I can't say why or how for certain. I just took it day-by-day, learned to be more honest about where I am rather than hide my faults, and learned how to love myself better! Big change tends to happen slowly over time.
Thank you sir- it seems you are genuinely concerned for my health and well-being. I'm honored to have someone like you keeping an eye on what I'm up to!
The damn inrush current blowing my fuses... :angry:
Hi RPBCACUEAIIBH, Yeah.. inrush can be a bit nasty. I hope you've got a few spares!
I bet 99% percent of viewers have no idea what your talking about. We just want to buy something that works and at an affordable price. Just want a air conditioner to start up from a battery and inverter.