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Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
I was thiking about something to increase SSTC's power without making it a DRSSTC.
Is there anyway to put a series inductor without changing the LC Ressoant Frequency?
I thinked about an LC Tuned Primary at an SSTC, but with a series inductor (or capacitor) to limit the current with the reactance. The only two problems I think, I will waste much power on the "shunt" inductor/capacitor and the extra cap/ind will change the fres of the primary LC.
Is there anyway to do that? Or something else that I can adjust the current (without using an OCD)
Registered Member #2677
Joined: Mon Feb 08 2010, 03:06AM
Location: Palo Alto, California, USA
Posts: 64
Because the primary coil of an SSTC is not resonant, the primary current is limited by the impedance of the primary coil at the secondary's fres. The reason a DRSSTC needs active current limiting (an OCD) is because the primary coil of a DRSSTC is resonant so the current in the tank circuit "rings up" every time the bridge switches. Hope this answers your question, UbuntuNinja
Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
Yes I obviously know that, that is why the title was "SSTC with DRSSTC Limited Primary"
I can reduce the inductance to reduce the reactance, but if I decrease the primary inductance that means reducing the number of turns and that changes the coupling too. If I reduce too much Most of the energy wont go to the secondary, so I have an limit.
My idea is doing something like putting a series resistor in the primary, but resistors will dissipate energy as heat, and that can be a problem with a few tens of amps flowing, so I asked about inductors or capacitors.
As ScotchTapeLord said, it will detune the primary tuning, I thinking if there is any way to limit the current like a resistor would do.
Registered Member #2115
Joined: Fri May 08 2009, 01:17PM
Location: Singapore
Posts: 46
Adding a L or C coponent in series with the primary L (and 'resonating' C)will just create a bigger lumped L or lumped C, detuning the SSTC. I think if you want a DRSSTC to look more like an SSTC you should use a big L and small C like a QCW to keep on times long rather than the usual 100-200us of on time for DRSSTCs
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SSTC as a DRSSTC Limited Primary
