Some input fields and some calculation results that need comments have tooltips.
The contents of these tooltips repeats the aid stations.

        1. In a resonant Converter, the primary winding scattering inductance is often used as the resonant inductance. If the scattering inductance is not sufficient to obtain the calculated value of the resonance inductance, then a separate choke can be put. The inductance of this choke is equal to the difference between the calculated value of the resonance inductance and the real inductance of the primary winding scattering.

        2. The losses in the core depend on the combination of induction and frequency. At high frequency and high induction losses will be so large that the heating of the core will exceed reasonable limits.

        3. For PWM controllers set the frequency equal to half the frequency of the master oscillator chip. The pulses of the master oscillator are fed to the outputs in turn, so the frequency at each output (and transformer) is 2 times lower than the frequency of the master oscillator.
IR2153 chips, and similar to this family of chips, are not PWM controllers, and the frequency at their outputs is equal to the frequency of the master oscillator.

        4. The fill factor of the window describes what part of the Windows core will take all the windings. For rings can be set more to 0.4, as they have a large window area. In W-shaped cores window area is limited by the core and frame. For them, the window fill factor can be in the range of 0.15-0.35, depending on the size of the core, smaller values correspond to smaller sizes.

        5. The current density depends on the cooling conditions and the size of the core.
At natural cooling it is necessary to choose 4 - 6 A/mm2.
When ventilation current density can be selected more, up to 8-10 A / mm2.
Large current densities correspond to small cores.
When forced cooling, the permissible current density depends on the cooling intensity.

        6. With unipolar rectification, despite the greater consumption of copper, the midpoint rectification circuit has the advantage, since the losses on the two diodes will be 2 times less than on the four diodes in the bridge circuit.
But on the other hand, with unipolar rectification will be less overall power transformer due to the double number of turns in the secondary winding.

        7. When you add a core to the database, the name of the new core is entered in the combo box.
There is no need to assign to the name of the core the prefix of its shape and the name of the core material.
The prefix of the core shape and the name of the material are added automatically by the program.

        8. When adding a new core to the database in any case, it is better to use the "Add to database (data entry)"checkbox. The data should be taken from the manufacturer's documentation. Decoding of data designations:
    Ae-core area, mm2
    An - the area of the bobbin window under winding, mm2
    le - average length of the magnetic line, mm
    Ve is the volume in cm3
In case of absence in the documentation of the manufacturer of the area of the window bobbin under winding, calculate the area of the window yourself.
The amount of the program considers on their own. The volume is equal to the product of the area of the core section by the length of the average magnetic line.
Although I did the calculation of the core data on the geometric dimensions, the results of this calculation are not accurate, since the data from the manufacturers are somewhat different from the direct calculation of the geometric dimensions.

        9. When choosing the shape of the core "Other" data taken from the manufacturer's documentation.