The design of switching power supply transformer

Switching power supply transformer is the power transformer, which is added to the switch management. In the use, not only has the function of the ordinary transformer’s voltage transformation, but also has the function of the insulation isolation and power transmission. In the switching power supply and other occasions involving the use of high frequency circuit is widely used. Switching power supply transformer design is very important to the use of the switching power supply, suitable design can make the switch power supply transformer better to control the current, the design method is not reasonable to the use of switching power supply transformer
Principle:
The main materials of the switching power supply transformer are: insulation materials, wire materials, magnetic materials. Switch power transformer with the switch tube together constitute the self-excited or his excited intermittent oscillator, the DC voltage modulated into a high frequency pulse voltage and finally to energy transfer and conversion. When the switch is switched on, the transformer converts the electric energy into a magnetic field to store it, and when the switch is cut off, it is released. In the forward circuit, when the switch is turned on, the input voltage is supplied directly to the load and the energy stored in the energy storage inductor. When the switch is cut off, the energy transfer is carried out by the energy storage inductor. More simply, the role of the switching power supply transformer is to convert the input DC voltage into the low pressure needed in our use.
Structure:
In the design of the structure of the switching power supply transformer, we should consider the following points, leakage magnetic must be small so that the leakage inductance of the winding can be reduced. In the structure design to make it easy to winding and lead the way so that the transformer is not only simple and convenient, but also for the maintenance and production of the transformer is very helpful. In the design of a reasonable plan, so that the voltage can have sufficient space and function for cooling. If the design of switching power supply transformer on the full consideration of the above factors, then this design can make the switch power transformer more secure, more durable life.
Choice
In the design of switching mode power supply transformer when the material choice is very important, and in the choice of core is switch in power transformer, according to the choice of switching power supply transformer use different materials are also different. For use in the us the most extensive core is iron, manganese, and zinc oxide core used in the power supply input filter is used to high permeability core. Because of the low price of soft ferrite, good adaptation and high frequency performance, it is widely used today.
Requirement
Switching power supply transformer design has certain requirements, these requirements can make it achieve the best use effect. The first is that the leakage inductance is small, because the voltage spike of the switch is connected with the size of the voltage spike, the circuit condition, the collector circuit configuration and the leakage inductance. Secondly to avoid transient saturation, in instantaneous electrical transformer core serious saturation will produce great surge current, in a very short period of time may cause the switch tube damage, generally in actual use will install soft start circuit to solve the problem. The effect of temperature is also considered in the design.
Testing
The detection method is very important in the use of the switching power supply transformer. In the detection, it can be seen whether there is an abnormal phenomenon, and the insulation of the switch power transformer is tested by the test. The above is a small series of switching power supply transformer is a brief introduction, we want to help group.

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