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Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Hi guys, I’m enough of a single transistor and decided to make my first half-bridge. It is based on two BUP314 IGBT and TL494 driver (no feedback). As a current limit is used the circuit by itself involving rolled motor caps (total 150uF). Sparks are nice and almost 50cm long, the transistors heat dissipation is not critical – but I decided for active cooling anyway…
Registered Member #192
Joined: Fri Feb 17 2006, 03:08AM
Location: Canada
Posts: 44
I'd say it's an SSTC. There is no interupter. If you primary cap was at resonance you'd blow a fuse or circuit breaker. Also you DC cap to supply power to your IGBT's is was too small.
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Colin 99 wrote ...
I'd say it's an SSTC. There is no interupter. If you primary cap was at resonance you'd blow a fuse or circuit breaker. Also you DC cap to supply power to your IGBT's is was too small.
Shaun
This circuit does not need an interrupter and neither a fuse because it is self limiting in the amount of power delivered to the transistors.(you can short-circuit the + and - and nothing happens, you would only hear gentle 50Hz noise). I do not want to argue whether it is DRSSTC or just SSTC – I do not exactly now how the DR is defined. However my coil has resonant cap with the primary which is loaded by transistors driven also in resonanace freq. thus I call double resonant…
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Also if I'm not mistaken a DRSSTC is defined as having two (2) feedback circuits to allow the primary to resonate causing more power to be applied to the secondary which would also resonate but it has to resonate to work anyways. As far As I can tell its just a SSTC with a voltage doubler and IGBT's instead of Fets.
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
No, a DRSSTC has two resonant circuits. ie an inductor and capacitance in the tank circuit. A SSTC just drives the the primary at the resonant frequency, whereas a DRSSTC has the tank oscillating at a frequency and the IGBTs acting as the spark gap and firing at a presettable BPS.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
I hate trying to explain or understand the differences between DR and regular SSTCs, I usually get them wrong, eitehr way someone with more knowledge explained it. (And I tryed!)
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Simple DR?SSTC
I hate trying to explain or understand the differences between DR and regular SSTCs, I usually get them wrong, eitehr way someone with more knowledge explained it. (And I tryed!)