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    What is passive component?


    Electronic circuits have both active and passive devices. The so-called passive components can operate without being connected to electricity, and have the functions of adjusting current and voltage, storing static electricity, preventing electromagnetic wave interference, filtering current impurities, etc. Compared with active components, passive components change in voltage At the time, resistance and impedance will not change accordingly. Passive components can cover three categories of products: inductors, resistors, capacitors.
    The following are introduced respectively:
    1. Inductor. Inductance is a coil wound with insulated wire. Inductor is a component that can convert electrical energy into magnetic energy (reactive power conversion) and the stored component is generally referred to as a coil. When current passes through the coil At that time, an electromotive induction potential is generated, called inductance. The magnetic flux generated in this process is called inductance.
    2. Resistor: The function of the resistor is to adjust the voltage and current in the circuit.It can be divided into three categories according to the material and product packaging..
    2.1 Fixed non-chip resistor: This product is mainly used to handle power supply Power or signal, the largest demand for electronic products such as power supplies and monitors
    2.2 Fixed chip resistors: This resistor product is widely used in information, communications, consumer electronics and various instruments
    2.3 Thermal Thermistor and variable resistor: mainly used in temperature sensing or control, motor protection and starting device, and overcurrent / voltage protection device.
    3. Capacitor: When two conductive substances are separated by a medium, they are used for storage. The static electricity is the capacitor. There are many types of capacitors, which can be divided into more than 30 kinds according to the materials used. Domestic manufacturers mainly produce aluminum electrolytic capacitors, ceramic capacitors and plastic film capacitors. What I saw in the report is one of the types of ceramic capacitors-multilayer ceramic capacitors (MLCC).
    Basically, ceramic capacitors can be divided into two categories, one is single-layer ceramic capacitors, and the other is multilayer capacitors. pottery Porcelain capacitor (MLCC). Because of its small size, large relative capacitance, low loss rate during high-frequency use, and high stability, MLCC has a bright future in light of the thin and short electronic products. The prospect of MLCC is quite optimistic, mainly used in motherboards and notebooks. Computers, mobile phones, scanners, optical drives and modems, etc.


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