it is possible on those server supplies to adjust the voltage +/- 3V, there is an adjustment on the edge connector if you add resistors and internally by adjusting the potentiometers.
You are right, I did not mention this in the video, but it is correct there is a "3rd" potentiometer that can be replaced by a external to adjust the voltage, I saw some guides for the 800W models.
With these heaters you should try to match the original resonant frequency, you can however also lower it much more than you can raise it. If you make a coil with a smaller inductance than the original, you risk killing the MOSFETs from increased switching losses due to the higher frequency of the LC circuit.
Why use regulated power supplies instead of a rectified transformer? I'm asking because I don't know. I have had good luck locating high VA transformers as scrap or surplus, but would likely have to pay more for switching supplies. If using a bridged transformer, would you suggest output capacitors or not? Thanks for the great videos!
More light weight, large VA transformers is becoming more rare to find. You need smoothing/filtering capacitance on a full-bridge rectified transformer to use it for a Royer oscillator,
@@KaizerPowerElectronicsDk That does look pretty slick! I'm well versed in low voltage, residential, and have dabbled with VFDs and 3ph enough to know how to retrofit them into 1ph installations; but my circuit designing has been limited to simple stuff like latching relays, solenoids, etc. My reason for exploring these induction coils is to anneal rifle brass necks. I figure a simple variable timer, some solenoids, and a bit of fabrication, should result in a machine that'll drop quench the brass and feed another case without human intervention.
They come from so many different manufacturers, but generally they are known as chinese induction cooker capacitors, like these: bm-capacitor.en.made-in-china.com/product/eXGxBWSEXPcq/China-Mkph-Induction-Cooker-Capacitor-with-UL-CQC-VDE-Certificate.html
@@KaizerPowerElectronicsDk Interesting. They're simply there to smooth out the voltage/current right? Is it possible to use 400F supercapacitor's in series in this application? Like, say if you used a six string balancing board then paired three of those in series? (2.7VDC * 6 = 16.2VDC @ 66.66 Farads) * 3 = 48.6 Volts @ 200 Farads.
150W induction heater: ua-cam.com/video/A8FWSzfHgGc/v-deo.html
1800W induction heater: ua-cam.com/video/jmAZhjl8Ybk/v-deo.html
36V 2200W server power supply: ua-cam.com/video/xRAlXCzsY3Q/v-deo.html
40V 2000W laptop power supply: ua-cam.com/video/5iMFYdDMfXo/v-deo.html
1800W IH 10 minute stress test: ua-cam.com/video/v-TsBLFp8yo/v-deo.html
Great demo Mads
Thank you for the video, it help me a lot to understand about this induction heater power usage.
I am happy it can still help people 4 years later :)
it is possible on those server supplies to adjust the voltage +/- 3V, there is an adjustment on the edge connector if you add resistors and internally by adjusting the potentiometers.
You are right, I did not mention this in the video, but it is correct there is a "3rd" potentiometer that can be replaced by a external to adjust the voltage, I saw some guides for the 800W models.
@@KaizerPowerElectronicsDk i have adjusted these types of power supplies as high as 14.5V before to get a bit more power out of car audio amplifiers.
No of turns required for work coil(1/2inch cu tube ) outer dia of 16.5 cm.purpose is to heat 5 inch hollow fe pipe of 10 cm length
With these heaters you should try to match the original resonant
frequency, you can however also lower it much more than you can raise
it. If you make a coil with a smaller inductance than the original, you
risk killing the MOSFETs from increased switching losses due to the
higher frequency of the LC circuit.
how the temperatures of steel that you got? you have to tell us sir
Judging from the colour of the steel, around 800 degree Celsius
Why use regulated power supplies instead of a rectified transformer?
I'm asking because I don't know. I have had good luck locating high VA transformers as scrap or surplus, but would likely have to pay more for switching supplies.
If using a bridged transformer, would you suggest output capacitors or not?
Thanks for the great videos!
More light weight, large VA transformers is becoming more rare to find.
You need smoothing/filtering capacitance on a full-bridge rectified transformer to use it for a Royer oscillator,
@@KaizerPowerElectronicsDk Is there a good rule of thumb for ųf per VA? I have a stash of caps from my hoarding days.
@@MotivatedMetalworks I am super happy you asked, so I can share this wonderful tool with you: www.duncanamps.com/psud2/
@@KaizerPowerElectronicsDk That does look pretty slick!
I'm well versed in low voltage, residential, and have dabbled with VFDs and 3ph enough to know how to retrofit them into 1ph installations; but my circuit designing has been limited to simple stuff like latching relays, solenoids, etc.
My reason for exploring these induction coils is to anneal rifle brass necks. I figure a simple variable timer, some solenoids, and a bit of fabrication, should result in a machine that'll drop quench the brass and feed another case without human intervention.
Hello, how long you use these 36v psu?
It is still in use now and then, but nothing like daily use for hours :)
What capacitors are being used here?
They come from so many different manufacturers, but generally they are known as chinese induction cooker capacitors, like these: bm-capacitor.en.made-in-china.com/product/eXGxBWSEXPcq/China-Mkph-Induction-Cooker-Capacitor-with-UL-CQC-VDE-Certificate.html
@@KaizerPowerElectronicsDk Interesting. They're simply there to smooth out the voltage/current right? Is it possible to use 400F supercapacitor's in series in this application? Like, say if you used a six string balancing board then paired three of those in series? (2.7VDC * 6 = 16.2VDC @ 66.66 Farads) * 3 = 48.6 Volts @ 200 Farads.
Is it still working?
It is, it has been a while since I last used it.