High frequency transformer specifications is not an official standard value of the high frequency transformer is a non-standard components, so we use the time not according to specifications to choose, transformer switch power supply is to their own design parameters are not universal, we can only own design, this paper will introduce the front the parameters of each part of the performance of high frequency transformer control table, here is no longer here, but a general framework. If the output power is small, you can find the common EE1x column frame, this paper is to introduce how we should according to the parameters you want to design the selection of parameters, analysis of the details please see below.

First of all, according to the working frequency, circuit topology and output power by using the formula or experience to select the appropriate size of the transformer specifications, and sometimes also consider the work environment (such as temperature, the use of occasions, whether sealing), assumption is flyback circuit, 60KHZ frequency, EE25 or EE28 can be. Then, the calculation of primary turns, the primary turns with the working frequency, the magnetic core core length, cross-sectional area, the input voltage is used, each kind of topology are a complicated formula; the more experienced designers will directly give the number of turns. Just make sure you get off the assembly line.

Finally, the secondary and offset turns and the line diameter are calculated based on the primary turns, the input and output voltages, and the duty cycle. The next thing is to debug and adjust. There are many kinds of transformer parameters that can work properly, but the optimum state is only one. The calculation is done first, and the adjustment is to find the optimum state. High frequency transformer is the most important component of switching power supply, and the ratio of turns of each winding in the high frequency transformer determines the output voltage.

High frequency transformer is the most important component of switching power supply. There are many topologies in switching power supply. Such as a half bridge power converter circuit, two or three pole switch to produce 100kHz high frequency pulse wave and high frequency transformer is a transformer, output current, high frequency transformer? Coil number ratio determines the amount of output voltage. Half bridge converter circuit is typically the most prominent is the three high frequency transformer: main transformer, drive transformer and auxiliary transformer (standby transformer), in the state of transformer are all? Have their own measures, such as the main transformer, as long as the power is more than 200W, the core diameter (height) will be not less than 35. Auxiliary transformer, when the power supply is not more than 300W, the core diameter reaches 16mm.