Symmetric DC-DC power transformer

I am working on a dual active bridges (4 mosfets instead of 4 diodes) by sw itching directions using either: 555, CPLD, FPGA or micro, depending on tim ing complexity. In the simplest case, just a 555 switching primary and sec ondary at the same time. In more complicated case, a micro switching with turn-on delay T1, turn-on time T2, turn-off delay T3 and frequency F1.

What are the estimated efficiencies with:

  1. T1, T3 = 0
  2. T1, T3 0

For instance, 20 degrees T1 to ramp up magnetic field on the primary, 140 d egrees to drive secondary and 20 degrees to ramp down.

What would be the best F1 for driving a microwave transformer at around 12V ? Perhaps outside audio range to avoid humming.

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Reply to
edward.ming.lee
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The dual active bridge topology uses LLC transformer

Using an advanced topology like this combined with the request about a microwave transformer makes no sense from my humble point of view

You cannot get the correct leakage inductance in this case and ZVS ZCS is not possible

Using those simple drive circuits you might better go for a HB topology with synchronous rectification

Better is to wind your own transformer if you insist on using DAB

Cheers

Klaus

Reply to
klaus.kragelund

OK, i will look into getting LLC transformer.

What above just driving it at a narrow range of one side? For example:

let Vi be input voltage, Vx be 0.2Vi, Vj be Vi + Vx, Vk be Vi - Vx

Drive input at Vj, Vk, Vi, Vk, etc.

My concern is saturating the core.

Reply to
edward.ming.lee

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