Ltspice Tapped Inductor

Adding the k statement displays the phasing dot of the included inductors. In the schematic l1 and l2 are magnetically coupled by the k1 coefficient 1 simulating a tapped inductor this isnt the same as two separate coils.

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The inductor is wired in such away that half the wiring is on one side of the inductor and the other on the other side in the way that is supports current flux ratio in the same direction the opposite of a cm choke hence differential inductor.

Ltspice tapped inductor. The center tapped transformer secondary will be divided into two vs1 and vs2 with same amplitude and 1800 phase difference. We used one primary inductor l1 and two secondary inductors l1 and l2 put in series. Here is the circuit.

We will design a step down center tapped transformer using ltspice with 201 turn ratio. The hartley oscillator will operate with independent inductors. Observe that the winding is presented with a voltage equal to the cores voltsturnprimaryturns and that the core is presented with a current equal to the windings ampere turns windings ampsprimaryturns.

Typically one specifies two separate inductors and uses the inductive coupling element with them. With independent inductors in series the impedance ratio determines the voltage ratio at a given frequency. Tapped inductors are a useful circuit element.

One problem that occurs is that the coefficient of coupling cannot be a user defined value. By default ltspice will supply losses to inductors to aid smps transient analysis. We can use vp170v fp60hz.

Ltspices fully extended inductor parasitics are included within this model. However one can use mutually coupled inductors to simulate a center tap transformer. The combined turns in series makes up the total inductance.

Figure 361 shows the schematic of the circuit. This makes the simulation matrix smaller faster to compute and less likely to be singular over all time step sizes. Ltspice simulates the transformer using individual component values in this case the inductance of the individual inductors not the turns ratio of the transformer.

This morning i worked through some ltspice simulations using tapped inductors to get different inputoutput current ratios. The steps are same. The inductance ratio corresponds to the turns ratio as follows.

Two solutions for this problem are provided. There is no direct model in pspice for a center tap transformer. Ltspice uses proprietary circuit simulation technology to simulate this physical inductor without any internal nodes.

I thought about treating them as two separate inductors but then there is mutual inductance which complicates matters. This time we will use 3 inductances.

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