I have a power board from a 12 VDC to 120 VAC 3000 watt power inverter. It has 10 transformers all in parallel. I've shown it in the first pic. The primary of each is a center-tap 12-0-12 push-pull and the secondary is 170 VDC after rectification and filtering, I've illustrated one of them in the second pic. What i thought about doing, for a high voltage ZVS phase shifted full bridge power project, was using 5 of these transformers in series, on both the primary and secondary, illustrated in the third pic. I don't know much about the magnetic theories at play. Will this work? What are the disadvantages and drawbacks?

 

it will not work...

those small transformers are meant for high frequency (tens or hundreds of kHz).
using ZVS with mains means frequency is very low (only 50 or 60Hz).
for that you need different transformer ... that is much chunkier.

 

I have a power board from a 12 VDC to 120 VAC 3000 watt power inverter. It has 10 transformers all in parallel. I've shown it in the first pic. The primary of each is a center-tap 12-0-12 push-pull and the secondary is 170 VDC after rectification and filtering, I've illustrated one of them in the second pic. What i thought about doing, for a high voltage ZVS phase shifted full bridge power project, was using 5 of these transformers in series, on both the primary and secondary, illustrated in the third pic. I don't know much about the magnetic theories at play. Will this work? What are the disadvantages and drawbacks?

I presume you are swapping primary and secondary to make a step-down circuit.
If they are identical and you run them at the same frequency as the original circuit, it might work.
Two in series should work, if the input voltage to the H-bridge is 325V DC (rectified 230V AC).

 

it will not work...

those small transformers are meant for high frequency (tens or hundreds of kHz).
using ZVS with mains means frequency is very low (only 50 or 60Hz).
for that you need different transformer ... that is much chunkier.

I'm not using them at mains frequency. I would use the frequency they are meant to be used at, 50 kHz.

 

What does work and has been used in different high voltage DC supplies is to drive the low voltage primary windings either in unison or in parallel and have a separate bridge and capacitor on each one, and put those in series. THAT SCHEME WORKS VERY WELL because there is no need for any synchronization. Also the diode bridges and filter caps can be lower voltage units costing much less. But putting the secondaries directly in series requires them to be perfectly in phase. That is difficult.