Calculation of turns of high-frequency transformers for switching power supplies
Calculation formula: N = 0.4 (l/d) to the second power. (Where, N a number of turns, L an absolute unit, luH = 10 cubic. d - coil average diameter (Cm) .)
For example, winding L = 0.04uH inductance coil, take the average diameter d = 0.8cm, then the number of turns N = 3 turns. When calculating the value, the number of turns N is slightly larger. The inductance can be adjusted within a certain range.
The number of wire roots of a coil is not necessarily the number of turns, only when the number of parallel winding roots is equal to 1, the number of wire roots of a coil is equal to the number of turns of the coil. There is the following relationship: the number of conductor roots of a coil a parallel winding roots x the number of turns the number of wires in each slot of a motor stator is the number of wires in each slot is equal to the number of turns in a single layer winding; in a double layer winding, the number of wires in each slot is twice the number of turns i.e., 2 x the number of turns.
1, high-frequency transformer is mainly used in high-frequency switching power supply for high-frequency switching power supply transformer, also used in high-frequency inverter power supply and high-frequency inverter welding machine for high-frequency inverter power supply transformer. According to the working frequency, can be divided into several grades: 10kHz-50kHz, 50kHz-100kHz, 100kHz-500kHz, 500kHz-1MHz, 10MHz and above.
2, in the high-frequency transformer design, transformer leakage inductance and distribution capacitance must be reduced to a minimum, because the switching power supply in the high-frequency transformer transmits high-frequency pulsed square wave signals. During the transient process of transmission, leakage inductance and distributed capacitance can cause inrush current and spike voltage, as well as top oscillation, resulting in increased losses.
