The resistance in the circuit is represented by R and a number, such as R15 means a resistance of 15. The main functions of resistors in a circuit are shunt, current limit, voltage divider, bias, filter (used with capacitors) and resistor matching.
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In fact, there are many parameters related to FETs, including DC parameters, AC parameters and limit parameters, but generally pay attention to the following main parameters:
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There are two types of FETs: junction type and insulated gate type. The junction field effect transistor (JFET) gets its name because it has two PN junctions, and the insulated gate field effect transistor (JGFET) gets its name because the gate is completely insulated from other electrodes. At present, among the insulated gate type field effect transistors, the most widely used is MOS field effect transistor, referred to as MOS transistor (ie metal-oxide-semiconductor field effect transistor MOSFET); in addition, there are PMOS, NMOS and VMOS power field effect transistors, etc.
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With the development of large-scale integrated circuits, the volume and weight of electronic equipment are getting smaller and smaller, while the traditional continuous regulated power supply cannot meet the optimal design of the whole machine due to its large size and low efficiency. Switching power supply is a new type of power supply with small size, light weight and high reliability. It has the outstanding advantages of low power consumption and high efficiency, and its efficiency can reach more than 75%. Switching power supply to replace linear power supply is an inevitable trend of industrial development.
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In order to obtain different output powers to control the temperature of the heating load, the controlled parameter is actually the rms value of the intermediate frequency voltage across the load. The rms value of this voltage is similar to the DC voltage U output by the chopper. Therefore, by controlling the voltage value of the chopper, the output power of the inverter can be controlled, that is, the temperature of the heated load can be controlled.
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IGBT module is a modular semiconductor product that is packaged by IGBT (insulated gate bipolar transistor chip) and FWD (freewheeling diode chip) through a specific circuit bridge. The packaged IGBT modules are directly used in inverters, UPS uninterruptible power supplies and other equipment, and have the characteristics of energy saving, convenient installation and maintenance, and stable heat dissipation. Currently, most of these modular products are sold on the market. With the advancement of the concept, such products will become more and more common in the market. IGBT is the core device for energy conversion and transmission, commonly known as the "CPU" of power electronic devices. As a national strategic emerging industry, it is widely used in rail transit, smart grid, aerospace, electric vehicles and new energy equipment.
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