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The Role of Transformers
resistance to high-frequency, through the low-frequency
Release time:
2022-08-22 10:22
Inductive coil characteristics
1, resistance to high-frequency, through the low-frequency ------ inductive coil of the electrical characteristics and capacitors on the contrary, that is to say, high-frequency signals through the inductive coil will encounter a great deal of resistance, it is difficult to pass; and for low-frequency signals through the resistance presented by it is relatively small, that is, the low-frequency signals can be easier to pass through it. Inductance of the resistance of the DC coil is almost zero.
2, impedance ------ they are for the flow of electrical signals in the circuit will show a certain resistance, this resistance we call “impedance”.
3, self-inductance ------ inductive coil on the current signal presented by the impedance using the coil's self-inductance. Inductive coil sometimes we call it simply “inductance” or “coil”, with the letter “L”.
4, the number of turns ------ winding inductance coil, the number of turns of the coil we generally refer to it as the coil “turns”.
Commonly used coils
1, single-layer coil ---- single-layer coil is a circle of insulated wire next to a circle in the paper tube or plastic skeleton. Such as transistor radio medium wave antenna coil.
2, the beehive coil ---- If the coil is wound, its plane is not parallel to the rotating surface, but intersected at a certain angle, this coil is called the beehive coil. And its rotation week, the number of times the wire bends back and forth, often called the number of folding points. The advantages of the honeycomb winding method are small size, small distributed capacitance, and large inductance. Honeycomb winding are utilized to wind the coil, the more folding points, the smaller the distribution capacitance.
3, ferrite core and iron powder core coils ---- The inductance size of the coil is related to the presence or absence of a magnetic core. Inserting a ferrite core into an empty core coil increases the inductance and improves the quality factor of the coil.
4、Copper Core Coils ---- Copper core coils are more widely used in the ultra-short wave range, utilizing rotating the position of the copper core in the coil to change the inductance, this adjustment is more convenient and durable.
5、Color coded inductors---- color coded inductors are inductors with fixed inductance, and their inductance is marked by the same color ring as resistors.
6、Resistor coil (choke)----The coil that restricts the passage of alternating current (AC) is called resistor coil, which is divided into high-frequency resistor coil and low-frequency resistor coil.
7, deflection coil ---- deflection coil is the output stage of the television scanning circuit load, deflection coil requirements: high deflection sensitivity, magnetic field uniformity, high Q value, small size, low price.
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