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Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
I have quite a few questions. I lashed together a quick schematic of a Royer oscillator design, similar to the regular ZVS driver. Now, My question is, could a half bridge driver be used directly with this? The driver I want to use already has a schmitt trigger built into the hi and low inputs, and seems like it could work for said purpose. Here's the bridge driver link;
Also, why does there need to be a transformer, then the work coil? I've talked to a few people about it but they just say it won't work, or will blow up. Does the transformer act as a current limitation? I thought that's what the inductor does.
Anyway, please give me advice, on if this would work or not... Thank you!
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi,
There were some attempts to increase efficiency of the circuit by utilizing gate drivers. You don't need half bridge driver though, just two low-side drivers like UCC37322's.
Most attempts resulted in increased instabilities in the circuit though, and it tended to undergo parasitic oscillations and self-destruct. Large, slow pull-up resistance actually helps prevent this.
To decrease heating in your resistors and speed up the turn-on, you can use single transistor "active pullup" circuits, google for them.
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Couldn't shortened wire also help prevent parasitic oscillations? Ferrite beads and stuff like that sounds like they could help. And, what exactly is a pullup resistor? From what I understand, does it prevent said oscillations from happening?
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
the pullup resistor I am talking about is the high-power 470ohm resistor in original flyback driver schematic (IIRC), which pulls the gate up (feedback diode can only pull it down). I suggested you can replace the resistors with active-pullup circuit to reduce the losses.
Ferrite beads in series with driver outputs might help, if not you might need to use a large gate resistance as well which would defeat the purpose of gate drivers. Gate drivers have the benefit though of driving the gate much harder to 0 than the diode-drive.
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Could a Half bridge driver be used to create a Royer oscillator?
