Calculation method of high-frequency transformer turns for switching power supply
Calculation formula: N=0.4 (l/d) to the power of root. (Among them, N is the number of turns, L is the absolute unit, and luH=10 cubic meters. d is the average diameter of the coil (Cm).)
For example, when winding an inductance coil with L=0.04uH and taking the average diameter d=0.8cm, the number of turns N=3 turns. When calculating the value, the number of turns N should be slightly larger. The inductance produced in this way can be adjusted within a certain range.
The number of wires in a coil is not necessarily the number of turns. Only when the number of parallel windings is equal to 1, does the number of wires in a coil equal the number of turns in the coil. There is a relationship between the number of wires in a coil and the number of wires wound together × The number of wires in each slot of the stator of a turn motor refers to the number of wires in each slot equal to the number of turns in a single layer winding; In a double-layer winding, the number of wires per slot is twice the number of turns, which is 2x turns.
1. High frequency transformers are mainly used as high-frequency switching power transformers in high-frequency switching power supplies, as well as in high-frequency inverter power supplies and high-frequency inverter welding machines. According to the working frequency, it can be divided into several levels: 10kHz -50kHz, 50kHz -100kHz, 100kHz -500kHz, 500kHz -1MHz, and above 10MHz.
2. When designing a high-frequency transformer, the leakage inductance and distributed capacitance of the transformer must be minimized, as the high-frequency transformer in a switching power supply transmits high-frequency pulse square wave signals. During the transient process of transmission, leakage inductance and distributed capacitance can cause surge currents and peak voltages, as well as top oscillations, resulting in increased losses.
The transformer of a switching power supply usually needs to leave an air gap, is it to increase the stored energy
Firstly, to correct the issue, the transformer of a switching power supply usually needs to leave an air gap, depending on which switching power supply it is:
Since there is a transformer, you can actually Baidu flyback circuit. The transformer inside it requires an air gap to store energy. In other words, the air gap does not increase the amount of energy to be stored, but rather increases the "container" of energy storage.
You can also search for forward circuits or full bridge, half bridge, or push-pull circuits. Their transformers do not require air gaps, which involve the working principle of their circuits. Air gaps can reduce their efficiency.
Finally, if your question is' The inductance of a switching power supply usually needs to leave an air gap, is it to increase the stored energy? ', even if the question is rigorous. I can tell you that the air gap of a general inductor is similar to that of a transformer in a flyback circuit mentioned earlier. The air gap does not increase the amount of energy to be stored, but rather increases the "container" of energy storage.
