Форум за електроника

[showMANiak]

Някой може ли да ми даде някаква методика за изчисление на тороидален траф?Може и на руски да е макар че не съм много на ти с него
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Може и да бъркам.....

[Gryp]

жалявам че е на английски:


(1) Np = 1,37 x 105 / (F x Ae), where Np= primary number of turns, F = switching frequency, Ae = X x Y = window area of ferrite in cm2. Look at fig10. To make it easy to wound the transformator, we will have to choose the toroid core with minimal diameter of 2,5 cm and window area minimal of 0.75cm2.This is necessary for the easyness of self handwound. Remember that in push-pull system there is 2 primary windings.

(2) Ns/Np = Vo/8,8, where Ns = secondary number of turns, Vo = secondary output voltage

(3) Ap = 0,004 x Vo x Io, where Ap = window area of primary wire in mm2, Vo = output voltage, Io = output current.

(4) As = 0,13 x Io, where As = window area of secondary wire in mm2.

Example : If we use toroidal ferrite core with window area of Ae = 1 cm2. then from equation no. 1 we will have number of primary turn Np = 1,37 x 105 / (50Khz x 1 cm2) = 2,74 turns. In practice, number of minimal primary turns is 4 so the primary will cover the whole toroidal core. So we use 4 turns for Q1 and 4 turns for Q2.

From equation (2) we have that Ns/Np = 37/8.8 = 4,2. From here we can calculate that the number of secondary windings is = Np x Np/Ns = 4 x 4,2 = 16,8 or 17 windings. Like the primary, in secondary we use 2 x 17 turns, that is 17 turns for +37V –> 0 and 17 turns for 0-> -37V

Equation (3) is used tp determine the number of primary winding wires. We have Ap = 0,004 x 74 x 8 = 2,36mm2. If we use a 1mm diameter magnet wire, we will have window area of 0,785mm2 so we will need 3 wire magnets for each primary windings

Equation (4) is used to determine the number of wire needed for secondary windings. We have As = 0,13 x 8 = 1mm2 So if we use wire magnet with diameter of 0,8mm(window area = 0, 5mm2), then we will need 2 wires with diameter 0,8mm for each secondary windings.

просто нямам време да го преведа .... лесно ще се ориентираш с речник .. успех
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Константин Джупаров

[Nightmare]

Gryp от къде си го копорал това, ако е от някой сайт дай линк

[gryp^гост]

За съжаление това сам го копирал от този форум преди около година ... беше пак по някакъв повод свъран с инп. захр. .... и просто само това си имам .... но се надявам да помогне ...

[showMANiak]