This is a neat circuit, but it carries the same limitations as other gate drive transformer schemes, mainly that it won't function properly with very low or high duty cycles. Also it still requires a DC supply on the secondary side for each gate.This looks like a better description of a very low cost pulse transformer design for high capacitive loads.
The details in the transformer are good. 1 or two turns, 10nS response cheap, >5KV isolation. Almost like a TV splitter core.
https://www.how2power.com/newsletters/1203/articles/H2PToday1203_design_FerenczConsulting.pdf
Now this is a scary circuit... after the transformer saturates, the driver is a very high impedance and it simply relies on the gate capacitance maintaining its charge. Any significant of interference or coupling to the gate during that time and boom. I wonder if anyone ever tried using this scheme in an actual product?This common gate transformer coupled driver claims to support wide duty cycle ranges
I think most power engineers won't accept this condition. When driving a FET, the driver should hold its state with a low impedance all the time. Otherwise any transient voltages on the drain can couple to the gate via Crss, causing undesired turn on and turn off. And such transient effects should be expected in practically all scenarios (line surge, load dump, etc).after which the gate can relax.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?