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Power semiconductor devices are the core of electrical energy conversion and circuit control in electronic devices, mainly used to change voltage and frequency, DC-AC conversion, etc., in electronic devices. Power semiconductor devices include rectifier diodes, power transistors (power MOSFETs, Insulated Gate Bipolar Transistors (IGBT)), thyristors, triacs, etc.
In recent years, the application fields of power semiconductor devices have expanded from industrial control and consumer electronics to new energy, rail transportation, smart grids, variable frequency home appliances, and many other markets, with the market size showing steady growth. From current market demand, silicon-based MOSFET...

MOSFET (Metal-Oxide-Semiconductor field-effect transistor) is a common semiconductor device widely used in digital circuits, analog circuits, power electronics, and other fields. This article will explain the basic knowledge of MOSFET from aspects such as basic structure, working principle, and parameter characteristics.
1. Basic Structure of MOSFET
MOSFET is composed of three parts: Metal, Oxide, and Semiconductor. Its...

Classification by frequency: The most basic classification method. Diodes are classified according to their characteristics into rectifier diodes, switching diodes, Schottky barrier diodes, Zener diodes, and high-frequency diodes for high frequencies. Additionally, Zener diodes are generally used as protection components, but with the refinement of peripheral circuits and application miniaturization, higher-performance protection components — TVS (Transient Voltage Suppressor) are required.
 Classification by structure: Mainly divided into the current mainstream Planar type and mesa type for high voltage resistance.

The maximum requirement of 30 KV in JEDEC is because it is a common electrostatic discharge (ESD) voltage limit.
ESD is an electrostatic discharge that occurs between two objects, which may damage electronic equipment or cause data loss. Therefore, to ensure device reliability and stability, JEDEC established the 30 KV electrostatic discharge standard. This standard is based on actual testing and experience, ensuring that devices are not subject to unacceptable electrostatic discharge effects during normal operation and use.

JEDEC has established several standards for electrostatic discharge (ESD) in electronic chips, mainly including the following...

Overview of SiC Power Devices
SiC (Silicon Carbide) power devices, with their characteristics of high temperature resistance, high voltage resistance, and low switching losses, can effectively achieve requirements such as high efficiency, miniaturization, lightweight, and high power density in power electronic systems, and are highly sought after in fields such as new energy vehicles, photovoltaic power generation, rail transportation, and smart grids.
In automotive applications, the significant advantages of SiC power devices in energy conversion efficiency can effectively increase the driving range and charging efficiency of electric vehicles. Additionally, SiC devices have lower conduction resistance, smaller chip size, and higher operating frequency, enabling electric vehicles to adapt to more complex driving...

Differential Mode Filter
Common Mode Filter    Both are filters used to suppress interference signals in circuits.

Differential mode filters are mainly used to suppress differential mode interference signals. Differential mode interference refers to interference signals that act separately on two signal leads in a circuit. By filtering and attenuating differential mode interference signals, differential mode filters can effectively eliminate the impact of differential mode interference on normal circuit operation.
Common mode filters are mainly used to suppress common mode interference...

Common mode inductor is an inductive device used to suppress common mode interference in circuits. Common mode interference refers to interference signals that simultaneously affect two signal leads (positive and negative) in a circuit, usually injected from external electromagnetic interference signals.
Selecting a common mode inductor requires considering the following factors:
1. Frequency range: The frequency response of the common mode inductor needs to cover the frequency range of the interference signals to be suppressed.
2. Rated current: The rated current of the common mode inductor should be greater than the maximum common mode interference current in actual applications.
3. Inductance value: Select based on the inductance value of the common mode inductor in the linear region, generally should meet the...

ESD: Electrostatic Discharge
TVS: Transient Voltage Suppressors
The difference between TVS tubes and ESD tubes is: their working principles are the same, but their power ratings and packaging are different; ESD is mainly used for electrostatic protection, which requires low capacitance value; TVS cannot achieve this, as TVS has relatively high capacitance value.
Transient Voltage Suppressor Diodes (Transient Voltage Suppress...

The basic principle of plasma formation involves heating matter to a sufficiently high temperature to ionize it, dissociating electrons from atoms or molecules to form free electrons and positively charged ions. The following are the main steps of plasma formation:
1. Heating: Matter is heated to a sufficiently high temperature. High temperature can be provided through electric shock, high-energy light, or thermal energy, etc.
2. Ionization: High temperature gives atoms or molecules of matter enough energy, triggering ionization. In this process, electrons bound in atoms or molecules are dissociated, forming free electrons and positively charged ions.
3. Electrical neutrality: In...