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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
The only way you can vary output current of this oscillator without changing component values, is to vary the input voltage. An other way of changing the current is eg. to change the capacitor value, for this you can connect several capacitor values to a rotary switch.
Registered Member #211
Joined: Sun Feb 19 2006, 05:33PM
Location:
Posts: 27
Okay I have one or two crude ideas for you: Force the core into saturation by some means, or divert some of the power elsewhere, ie via a small winding into a dummy load resistor. Alternatively, maybe wind two air core inductors in phase with the windings in series with the primary halves of the flyback. Use a slug core to vary the inductance, it should de-tune the oscillator enough to alter the output. You might lose some voltage this way too. Re-tuning the tank cap might bring the voltage back up, I don't know, I'm shooting in the dark somewhat here. I hope you figure something out and post the solution!
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I'm not very good actually, I've had a ZVS driver built for me, but I cannot probably make one, maybe if I tried.
I've driven flybacks from small wallwort PSU's (phones, routers, etc the HF ones not iron) and comuter SMPS's and also halogen transformers which you can buy a 250W one for £12, I bought one before you can check my thread (halogen transformer flyback success)
But I cannot make circuits very well, I'm going to build a ZVS, but I don't know where to start, do I buy each part from the schematic? and do I need breadboard?
Registered Member #4181
Joined: Thu Nov 03 2011, 02:39PM
Location:
Posts: 42
in all the ZVS arc videos that I have watched I don't recall one being made on anything more complex then ring board, usually a zvs is a trail of connected components strung across a half of a work bench... nothing holding them together but solder lol
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I have a Maplins near, yes, but I have trouble understanding the ZVS schematic, so I think it'll be much easier on a breadboard, do I have to buy each single part for the driver?
Also I have nothing to solder with, I took the transformer out of my gun, and I'll be buying a good soldering station in a few weeks.
Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
Platinum wrote ...
I have a Maplins near, yes, but I have trouble understanding the ZVS schematic, so I think it'll be much easier on a breadboard, do I have to buy each single part for the driver?
Also I have nothing to solder with, I took the transformer out of my gun, and I'll be buying a good soldering station in a few weeks.
Here is a simplified graphical schematic of the ZVS driver
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ZVS
