Proper GDT (Gate Drive Transformer) Construction (Half / Full H-Bridge)
by Simranjit_Singh in Circuits > Electronics
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Proper GDT (Gate Drive Transformer) Construction (Half / Full H-Bridge)
 for SSTC / DRSSTC, etc.)
It's important to use GDT for high voltage projects like SSTC (Solid State Tesla Coil)., DRSSTC (Dual Resonant Solid State Tesla Coil), or you can even use it for flyback transformer or induction heater. It also allows you to drive High Side N-Ch MOSFET without specialized high side MOSFET driver.
Supplies
1x Toroid Core (Buy from reputable sources like Digikey / Mouser)
1x Cat 5 cable
2-3 zip ties (optional)
Choose Material for Toroid
Ok materials:
3C11, 3E6, 3E12, 3E10, 3E15, 3E25, 3E26, 3E27, 3E65
Ideal materials:
PC40, PC200
N27, N30, N35, N41, N49, N51, N72, N87, N88, N92, N95, N96, N97
T35, T37, T37, T38, T46, T57, T65, T66
3C90, 3C91, 3C92, 3C93, 3C94, 3C95, 3C96, 3C97
Calculate Number of Turns
Example calculation:
Outer_Diameter = 41.8mm, Inner_Diameter = 26.2mm, Length = 12.5mm
Area = Length * 0.5 * (OD-ID) * Pi/4 = 76.576
Flux Density @ (25C, 100C)
Flux N97 = 510, 410 mT
flux = 0.5 T
freq = 25 kHz ==>> time = 500 / freq = 20 us
volts = 24
Turns = ( time * volts ) / ( flux * area ) = 12.537 turns
Winding and Configuration
Wind the number of turns on toroidal core. Taking above example: 13-15 turns is ok. Less than 12 turns is not ok.
Wind the wire tightly. It’s important to use twisted cable to keep league inductance low.
Configure the wire for Half/Full H-Bridge configuration and connect them to appropriate pins of MOSFETs / IGBTs