Hey Brian what's that ceramic insulating stuff called? The name is eluding me hardcore right now. I need to find some kind of crucible but also looking for some kind of protective ceramic something-or-other to help me place loads in the coil.
Here it is man. That stuff is really temperature resistant. I got it from Amazon: CM-Ceramics 31" X 24" X 1" 2400 F... www.amazon.com/dp/B00GT5Q6X0?ref=ppx_pop_mob_ap_share
Hello Brian! I'm a little bit confused! Since I thought the current transformer supposed to feedback the tank frequency which is changing with load, and this feedback is what makes the inverter frequency change to match the tank frequency to achieve resonance, but putting the current transformer on one of the coupling transformer lead's just feedback the inverter frequency because the coupling transformer is conected to the inverter! I'm I right or I'm I messing something!?
altho my names not brian i hope i can help ^^ thats what i was mentioning a video prior, the current drawn from the inverter isnt the voltage supplied, depending on above below or at resonance the current is leading trailing and in phase respectively. for a series resonant circuit like this there will always be current flowing through the coupling transformer. (for a parallel resonance it wont be the same!) its always a stepdown, swinging up the tank, it is always at the same current the tank is, only stepped down, if you have a 100A in the tank with a 1:20 coupling capacitor, that means there will always be 5A cycling through the IGBTs in some way, either being rectified back to the bridge, or through the switches itself. so yes, the frequency fed back is the inverter frequency, but we really dont care about the frequency at all. we just care about the phase in relation to our input phase, since we produce a square voltage with defined 0 phase to itself, the current can be compared to it.
I honestly wasn’t expecting the coupling transformer feedback to work. However, surprisingly it works extremely well. The heating is even more efficient because I think it’s more accurate. There is very little current flowing in the coupling transformer from the 555 startup signal because it’s non-resonant ie detuned. However, if the voltage is pushed up high enough, it will induce some oscillations in the tank circuit and induce resonant oscillations which then takes over and there is a massive increase in current flow in the coupling transformer at this point.
@@contomo5710 Yes! Thank you for clarifying that for me. I have a question though. You mentioned this is a series resonant circuit, but upon examining the tank, I notice the capacitor and coil are connected in parallel. Each lead of the capacitor is linked to each lead of the coil, indicating a parallel configuration rather than a series one. Additionally, what are your thoughts on adding an EMI filter to the circuit?
@@haronwepworking5806 if you do a full drawing with coupling transformer it wouldnt look like that :P now follows an imgur link, youtube for some reason autodeletes my comment if i include the full URL: /a/D64CrdE also emi filter? where?
@@contomo5710 I see now! so the the same current goes through the capacitor and the coil wich mean they are in series! anD for the EMI filter i'm planing to install it on the mains power side before the bridge rectifier, since i'm not using a big filter capacitor because it lowers the power factor, i figured i could add an emi filter to get rid of the EMI.
Beautiful set-up" I look forward to more Experimentation.
Thank you!
Hey Brian what's that ceramic insulating stuff called? The name is eluding me hardcore right now. I need to find some kind of crucible but also looking for some kind of protective ceramic something-or-other to help me place loads in the coil.
Here it is man. That stuff is really temperature resistant. I got it from
Amazon:
CM-Ceramics 31" X 24" X 1" 2400 F... www.amazon.com/dp/B00GT5Q6X0?ref=ppx_pop_mob_ap_share
Hello Brian! I'm a little bit confused! Since I thought the current transformer supposed to feedback the tank frequency which is changing with load, and this feedback is what makes the inverter frequency change to match the tank frequency to achieve resonance, but putting the current transformer on one of the coupling transformer lead's just feedback the inverter frequency because the coupling transformer is conected to the inverter! I'm I right or I'm I messing something!?
altho my names not brian i hope i can help ^^
thats what i was mentioning a video prior, the current drawn from the inverter isnt the voltage supplied, depending on above below or at resonance the current is leading trailing and in phase respectively.
for a series resonant circuit like this there will always be current flowing through the coupling transformer. (for a parallel resonance it wont be the same!)
its always a stepdown, swinging up the tank, it is always at the same current the tank is, only stepped down, if you have a 100A in the tank with a 1:20 coupling capacitor, that means there will always be 5A cycling through the IGBTs in some way, either being rectified back to the bridge, or through the switches itself.
so yes, the frequency fed back is the inverter frequency, but we really dont care about the frequency at all.
we just care about the phase in relation to our input phase, since we produce a square voltage with defined 0 phase to itself, the current can be compared to it.
I honestly wasn’t expecting the coupling transformer feedback to work. However, surprisingly it works extremely well. The heating is even more efficient because I think it’s more accurate. There is very little current flowing in the coupling transformer from the 555 startup signal because it’s non-resonant ie detuned. However, if the voltage is pushed up high enough, it will induce some oscillations in the tank circuit and induce resonant oscillations which then takes over and there is a massive increase in current flow in the coupling transformer at this point.
@@contomo5710 Yes! Thank you for clarifying that for me. I have a question though. You mentioned this is a series resonant circuit, but upon examining the tank, I notice the capacitor and coil are connected in parallel. Each lead of the capacitor is linked to each lead of the coil, indicating a parallel configuration rather than a series one. Additionally, what are your thoughts on adding an EMI filter to the circuit?
@@haronwepworking5806 if you do a full drawing with coupling transformer it wouldnt look like that :P
now follows an imgur link, youtube for some reason autodeletes my comment if i include the full URL: /a/D64CrdE
also emi filter? where?
@@contomo5710 I see now! so the the same current goes through the capacitor and the coil wich mean they are in series! anD for the EMI filter i'm planing to install it on the mains power side before the bridge rectifier, since i'm not using a big filter capacitor because it lowers the power factor, i figured i could add an emi filter to get rid of the EMI.