Characteristic
The above transformers are widely used in switching power supply and have the following characteristics：
Use frequency：25-500kHZ
Power range：10-500W
High permeability, high efficiency, low leakage, good heat dissipation, small electromagnetic interference
Magnetic core：EE、EC、EI、EF、EER、ED、EFD、PQ、RM
Magnetic core material：SP3、SP4、SP4A
Installation: can be designed according to customer requirements
Applications
Various switching power supply: dc-dc, ac-dc-ac, dc-ac,UPS power supply, etc
Circuit form: forward excitation, back excitation, push pull, half bridge, full bridge circuit, etc
Used for power supply of communication, TV, air conditioner and computer. Switching power supply in all kinds of electronic equipment。
（1）A typical circuit
In switching power supply circuits, the commonly used typical circuit topologies are：
Forward - excited, back - excited, push - pull, half - bridge (full - bridge), etc。A typical three-way output forward converter topology is shown below。When the dc input voltage is 60-200v and the output power is 200W，Forward converter is probably the most widely used topology。
Three-terminal output forward converter topology
The typical circuit diagram of flyback converter is shown below5-150w low cost power supply applicationsIs very extensive, and its greatest advantage isNo secondary output inductance is required。
Flyback converter topology
The typical topology of a full-bridge converter is shown in the figure Input network pressure for 220V or higher applications，Its main advantage is that the leakage voltage spike clamp on the primary side of the transformer can be located at the dc bus voltage and the leakage energy can be fed back to the input bus。
Full bridge converter topology
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