Recently, according to Qingdao's "Opinions on Supporting the Reform and Development of Private Enterprises and Small and Medium-sized Enterprises" (Qingfa [2020] No. 14) and Chengyang District's "Implementation Opinions on Supporting the Reform and Development of Private Economy and Small- and Medium-Sized Enterprises" ” (Chengfa [2020] No. 18) and other documents, Chengyang District Bureau of Industry and Information Technology will be awarded the honorary titles of “Gazelle” in Shandong Province, “Specialized and Specialized New” in Shandong Province, and “Invisible Champion” in Qingdao in 2021. 27 high-growth companies are to be rewarded with funds. The maximum reward for a single company is 1 million yuan, and the cumulative amount is more than 22 million yuan.
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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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Recently, the Qingdao Development and Reform Commission announced the list of the second batch of Qingdao innovative application laboratories and scenario application laboratories. With its advanced product technology and outstanding achievements, Jiaen Semiconductor has stood out among many excellent companies and was successfully selected into the "Qingdao New Energy Vehicle Chip Technology Innovation Application Laboratory".
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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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