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Ferrite. FT50-43 4:1 Transformer. Bifilar Wound Toroids Session 2. Ferrite Transformers for Matching Amplifiers Ferrite Cores for Transmission Lines/Baluns, EMI Powdered Iron High Q inductors: Increased Inductance. Operating Principles Right Hand Rule For a Solenoid.

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Bifilar Wound Toroids Session 2


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bifilar wound toroids session 2

Ferrite

FT50-43 4:1 Transformer

Bifilar Wound ToroidsSession 2

Ferrite Transformers for Matching Amplifiers

Ferrite Cores for Transmission Lines/Baluns, EMI

Powdered Iron High Q inductors: Increased Inductance

slide2

Operating Principles Right Hand Rule

For a Solenoid

Reversing Current Direction Reverses the Flux

B [tesla]

B

I [Amps]

L1 [H]

I [Amps]

slide3

Operating Principles Right Hand Rule

For a Solenoid

A simple Experiment with a compass

Demonstrated in Lab

series connection of inductors bifilar winding additive l1 l2 leq l1 l2 2m leq 4l1 if m l1
Series Connection of InductorsBifilar Winding: AdditiveL1=L2Leq= L1+L2+2MLeq = 4L1 if M = L1

a

b

Wind one Inductor: 10 Turns Bifilar

Lead Length = 1.5 inches

Don’t solder windings yet

Measure Single Turn Inductor LC mtr

Solder Connections

Measure Bifilar Inductor LC mtr

Measure input impedance with AIM

Compare Single turn and Bifilar Inductance

Lbifilar

#26 Gauge

Yellow Core

winding bifilar inductors additive
Winding Bifilar InductorsAdditive

b

a

a

a

a

b

b

b

Layout wires per top left drawing. Check continuity

Connect per top right: Solder “a dot” to b

series connection of inductors bifilar winding subtractive l1 l2 leq l1 l2 2m leq 0 if m l1
Series Connection of InductorsBifilar Winding: SubtractiveL1=L2Leq= L1+L2 - 2MLeq = 0 if M = L1

a

b

slide8

4:1 Ferrite Transformer Bifilar Wound

Zin = 50 Ohms Zload = 200 Ohms

a

b

2 mA

b

a

Subtractive Currents

No flux in Toroid

1 mA

1mA

1mA

Make one transformer: 10 Turns FT50-43 material

Use #26 Gauge wire and supplied BNC connector

Measure input impedance with AIM Impedance meter

slide9

4:1 Ferrite Transformer Bifilar Wound

Zin = 50 Ohms Zload = 200 Ohms

b

a

a

b

b is ground.. Bend end up to label

a dot is connected to 200 Ohm resistor

Connect b dot to a : insert into center pin of connector