Low coupling coefficient of transformer and low transformer ratio

[minstrel1983]

The current transformer design should ensure a coupling coefficient of approximately 0.8-0.9, but current measurements show only 0.5.

Hypothesis:

Stray inductance in the primary winding is likely due to a questionable design of the primary windings.

Outcomes:

1. Overheating C1 battery, i.e. loosing energy
2. High load on H-Brindge and promary winding due to high-volatage ~1 kV in primary windings

[minstrel1983]

Problem is clear now - parasitic inductance of wires.

Parallel winding in the primary inductive was bad idea.

New transformer desing coming soon.

[minstrel1983]

Alternative solution - bring transfer as closest as possible to H-Bridge. Max distance - 5-10 cm.

[minstrel1983]

The current transformer design is unsuitable. The current transformer ratio is definitely insufficient.

Why the current design is problematic:

1. Reducing the primary inductance is a bad idea, as it becomes comparable to the inductance of the power cables. This leads to a significant decrease in transformer efficiency.
2. The current transformer ratio is around 13, which means we need approximately 1.5-2 kV in the primary winding to achieve 25 kV in the discharge chamber. This is extremely challenging (especially with p1). Increasing the DC voltage in this case can damage the H-bridge (I already burned one bridge trying this). The new transformer design should be ready by mid-November.

[minstrel1983]

New transformer design uploaded https://github.com/kinetikalab/project_aetheris/blob/main/power_electronics/transformer/README.md

To be tested next week in real conditions.

[minstrel1983]

Transformer design updated https://github.com/kinetikalab/project_aetheris/blob/main/power_electronics/transformer/README.md

The problem was with parasitic capacity. Now it fixed. New transformer has very low parasitic capacity ~10 pF.

Tested in discharge - works perfect.