Knowledge of Transformer and Inductor
Knowledge of Transformer and Inductor
Transformers and inductors are easily confused because they have the same physical shape. There is only one rule that can be distinguished between them, the transformer is marked with "QTK", and the inductor is marked with "QHP".
(1) Transformer
The following are some of the types of transformers we commonly use:
The circuit symbol of the transformer is: T.
Transformers are often identified by the "QTK" mark on the component body.
The transformer is polarized, and its first pin is usually indicated by a white mark, a hole or a sharp corner.
(2) Inductor
The symbol of the inductor is: L.
The "QHP" designation is often used on inductors and component bodies.
The unit of inductance is Henry (H), millihenry (MH), and microhenry (UH).
Inductors are polarized. The first pin of the inductor is indicated by a sharp corner. When inserting, it should be aligned with the white dot on the board.
The shape of the axial lead inductor and the resistor are very similar. The sign that distinguishes them is a wide silver ring on one end of the inductor. The axial lead is represented by the inductor with five color rings. The silver ring of the ** ring is twice as large as the other color rings. The following three rings indicate the millihenry value of the inductance, and the fifth ring indicates the error value of the inductance. The identification method of the subsequent four-rings is the same as that of the four-ring resistors.
Example: The colors of the last four rings of an inductor are: red, red, black, and silver, and the inductance value is 22 microhenries, ±10%.
If the color of the ** ring or the third ring is gold, this gold ring represents the decimal point of the inductance value.
Example: The colors of the last four rings of a certain inductance value are: yellow, gold, purple, and silver, and the inductance value is 4.7UH±10%.
