Power Supply Transformers
  The basic working princ-iple of transformer
  EI-type Transformers
 -EI Pin transformers
 EI Down-lead type transformers
 EI Bracket-type transformers
 EI Three-phase transfor-mers
  C-type Transformer
 -CD-type transformers
 -SD-type transformers
 -ED-type transformers
 -XCD-type transformers
  R-type, O-type transfor-mers
 R-type single-phase Tra-nsformer
 -O-type Transformer
Audio, pulse transformer
 -Audio transformer
 -Pulse transformer
Switching power supply tr-ansformer
 -Switching power supply transformer
 -Switching power supply filter
Special Transformers
 -Magnetic saturation Stabilizing Transformer transformers
 -Middle-power Non-standard dry-type power supply transformer
Iron core inductor
 -Types and characteristic of iron core inductor
 -DC reactor
 -Input reactor
 -Output reactor
 -Flow equalization reactor
EMC filter
 -Foreword
 -380 V Series of input and output filter matched for Inverter
 -Product shape diagram
Power Supply
 -Power supply for CATV
   The basic working princ-iple of transfor
The basic working principle of transformer

 Transformer refers to the static electromagnetic setting which can transfer power from one circuit to another one. In AC circuits, AC voltage, current and waveform can be transformed with the help of Transformers. Each transformation is usually to transfer from one circuit to another one by the way of electromagnetism, but it has no direct relation with this circuit. It also can be transformed through electromagnetism (electrical manner). This electromagnetism is known as auto-transformer.
  Transformer plays an important role in electronic equipment. AC and DC voltage in Power supply equipment are almost achieved by transformer’s transformation and commutation. At the same time the electrical parameters transformed by transformer are not one but a few ones.
  Most of the isolation, matching and impedance in the circuit carry out by transformer.
  Most of isolation, matching and impedance in the circuit carry out by transformer.
  Simple schematic diagram of the transformer is shown in (1-1). It is connected by closed-magnet (iron cores), two windings and AC power supply. The winding is called the primary winding; another winding is connected with load, and it is called secondary windings.

Figure 1-1 structural schematic diagram of transformer

  No-load state of Transformer: viz. the disconnecting state between he secondary winding and load (Figure 1-2). Connect the primary winding and the power supply of AC voltageU1, and then it will produce alternating current I0, this current is called no-load currents. This current set up alternating magnetic flowφ0 which is closed along iron core magnetic circuit. At the same time, it traverses the primary winding and secondary winding, and then produces inducting electromotive forceE2 (secondary no-load voltage).

Figure 1-2 no-load working Principle of transformer


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