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Registered Member #528
Joined: Fri Feb 16 2007, 10:32PM
Location: Warsaw, Poland
Posts: 166
Whoa, there are few terms I must learn before I consume what you have written But would my feeling that primary current and secondary current being shifted by 90 degrees is a right thing, be correct? Of course I'm using CT for secondary current feedback.
Would you give also advices, how can I make sure SSTC is properly tuned (or rather, PLL driver)? Having biggest possible spark is a good indicator of driver working properly? Since I don't have a isolation transformer and have only two scopes, I can't measure directly primary voltage and current.
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
I'd just like to say that most of what Marko said is correct. Although, whether or not the losses in point 6 are enormous enough to kill MOSFETs quickly depends on the design and what you are trying to do. You can certainly design an SSTC to withstand operation off-resonance without damage, but Marko is right that the out-of-phase magnetising current does reduce dissipation in the MOSFETs and the free-wheeling diodes when driving a resonant load properly.
BTW. The magnetising current is _TRIANGULAR_ in waveshape, not sawtooth, provided that the inverter outputs a squarewave of voltage at the switching frequency.
In short:
The secondary base-current of a SSTC is sinusoidal and in-phase with the inverter output voltage at resonant. (Voltage at the top of the secondary lags this by 90 degrees.)
The load current drawn from the inveter consists of two components added together. A sinusoidal component reflected back from the secondary that is in-phase with the inverter output voltage at resonance. _AND_ a triangular magnetising current waveform that is drawn by the primary iteself, which lags the inverter output voltage by 90 degrees regardless of the drive frequency.
The primary current waveform of a basic SSTC (not DRSSTC) is therefore a sinewave with a bit of shifted triangle added in. If you remove the secondary coil completely, only the triangular magnetising current remains.
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CD4046 PLL driver issues
But would my feeling that primary current and secondary current being shifted by 90 degrees is a right thing, be correct? Of course I'm using CT for secondary current feedback.