Schematic test circuit and net list for the F2213 pot core. in Software

Draw QR Code in Software Schematic test circuit and net list for the F2213 pot core.

Schematic test circuit and net list for the F2213 pot core.
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Magnetizing Force - Oersteds Magnetics "F" Ferrite B-H Loop
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Wfm2: VCORE in Volts Wfm1: PULSE in Volts
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455.00U
465.00U
475.00U
485.00U
495.00U
TIME in Secs Magnetics "F" Material
B-H loop for the F2213 pot core (top) and pulse waveform response (bottom).
Constructing a Transformer As a nal exercise in this chapter, we will combine the core model which we just completed, along with the turns subcircuit, and model a twowinding transformer. To make a transformer model that more closely represents the physical processes, it is necessary to construct an ideal transformer and
SPICE Modeling of Magnetic Components
Leakage Inductance
Series Resistance
Saturable Core
Ideal Transformer
Figure 2.37 A complete transformer model. The saturable core may be combined with the ideal transformer, XFMR, and some leakage inductance and series resistance to create a complete model of a transformer.
model the magnetizing and leakage inductances separately. The ideal transformer was discussed previously in this chapter. It has a unity coupling coef cient and in nite magnetizing inductance. The magnetizing inductance is added by placing the saturable reactor model (suitably scaled) across any one of the windings. Coupling coef cients are inserted in the model by adding the series leakage inductance for each winding as shown in Fig. 2.37. The leakage inductances are measured by nding the short-circuit input inductance at each winding and then solving for the individual inductance. These leakage inductances are independent of the core characteristics, as shown in reference [102]. The nal model, incorporating the saturable core model and an ideal transformer subcircuit, along with the leakage inductance and winding resistance, is shown in Fig. 2.37. PSpice models cannot represent all possible behavior because of the limits of computer memory and run time. This model, as most simulations, does not represent all cases. Modeling the core as a single element referred to one of the windings works in most cases; however, some applications may experience saturation in a small region of the core, causing some windings to be decoupled faster than others, invalidating the model. Another limitation of this model is for topologies with magnetic shunts or multiple cores. Applications like this can frequently be solved by replacing the single magnetic structure with an equivalent structure using several transformers, each using the model presented here. Another example is shown in Fig. 2.38. The SPICE 3 core model remains unchanged. We have simply added two transformer (turns) subcircuits. The primary winding has 10 turns, and the secondary has 20 turns. The secondary of the turns subcircuit is always 1 turn, which is the reason that we developed the core with 1 turn. The circuit was stimulated with a 10-V peak 20-kHz square-wave voltage applied through a 1- series resistor, and also with a 50-V peak 25-kHz square-wave voltage.
Two
G2 1
10.7 Tran CORE -10.7 450U 55.0 Tran INPUT -55.0 450U V(8) INPUT
time
500U R1 30.77
C1 4.9U
V(3) CORE time 500U
V1 199 Tran 0 -9.49 450U V(5) H time 500U
R2 1
X1 TURNS G1 1
214 Tran OUTPUT -213 450U V(9) OUTPUT
time
500U
X2 TURNS
B2 V=(1.149*(V(5)^-1.1376))/ ((1.094*(V(5)^-1.1376))+1.05) B1 V=ABS(1.256*I(V1))/3.12
EX5: MODEL FOR A TWO-WINDING TRANSFORMER PSpice version .AC DEC 20 100HZ 10MEGHZ .TRAN .1U 500U 450U UIC V(9)=OUTPUT (3)=CORE V(8)=INPUT V(5)=H .PRINT AC V(9) VP(9) V(3) VP(3) .PRINT AC V(8) VP(8) .PRINT TRAN V(9) V(3) V(8) V(5) V1 1 0 G2 0 4 2 1 1 C1 4 0 4.9U IC=0 E1 5 0 Value = { ABS(1.256 I(V1))/3.12 } E2 6 0 Value = { (1.149*(V(5) -1.1376))/((1.094 (V(5) -1.1376))+1.05) } E3 2 0 Value = { V(3,1)/(V(6)+.001) } R1 3 0 30.7700 X1 7 0 3 0 TURNS Params: NUM=10 X2 9 0 3 0 TURNS Params: NUM=20 Turns is similar to XFMR except Ratio = 1/Num V2 8 0 AC 1 PULSE -50 50 1N 1N 1N 25U 50U R2 8 7 1 G1 3 1 4 0 1 RT4 4 0 1G .END Figure 2.38 Schematic and netlist for the two-winding transformer test circuit.
SPICE Modeling of Magnetic Components
OUTPUT (wfm 2) in Volts INPUT (wfm 1) in Volts
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Time in Secs F42213 Ferrite Core Transformer Np=10 Ns=20
OUTPUT (wfm 2) in Volts INPUT (wfm 1) in Volts
455.00U
465.00U
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495.00U
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