Inductance values for various designsInductance values for various designs
The pictures below show various different pulse transformers that were tested. The core type and winding method are listed along with the measured inductances.
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Ferrite toroid. Ferroxcube 4330-030-34600 (UK Farnell part 305-6995) Dimensions: OD=25.8mm ID=14mm W=10.6mm Material: 3E25 Spec Ind: 5620 nH 9 + 9 + 9 turns of multi-stranded wires wound in seperate bundles spaced 120 degrees apart around the toroid. Lp = 533.6 uH, L1 = 4644 nH, L2 = 3689 nH, Lp/L1 = 115, Lp/L2 = 145 |
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Ferrite toroid. Ferroxcube 4330-030-34600 (UK Farnell part 305-6995) Core spec as above 9 + 9 + 9 turns of multi-stranded wires interleaved around the core. The combined winding was spread equally around the circumference of the toroid. Lp = 523.2 uH, L1 = 233.4 nH, L2 = 199.7 nH, Lp/L1 = 2240, Lp/L2 = 2620 Note: the massive reduction in leakage inductance values L1 and L2 ! |
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Ferrite toroid. Ferroxcube 4330-030-34600 (UK Farnell part 305-6995) Core spec as above 9 + 9 + 9 turns of multi-stranded wires tightly twisted together. This "twisted-threesome" was then wound evenly around the circumference of the toroid. Lp = 520.6 uH, L1 = 208.1 nH, L2 = 160.9 nH, Lp/L1 = 2500, Lp/L2 = 3240 Note: the further reduction in leakage inductance values L1 and L2. |
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Ferrite toroid. Ferroxcube 4330-030-34600 (UK Farnell part 305-6995) Core spec as above 9 + 9 turns of 3mm lapped-screened wire interleaved around the circumference of the toroid. Screens connected in parallel to form primary winding. Centre cores used as secondary windings. Lp = 528.4 uH, L1 = 124.8 nH, L2 = 67.6 nH, Lp/L1 = 4230, Lp/L2 = 7820 Note: the exceedingly low leakage inductance values L1 and L2. Probably dominated by stray inductance in the leads to the core. |
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