The induction heating power source has the highest heating efficiency and the fastest speed for metal materials, and is low in environmental protection. It has been widely used in various industries for the thermal processing, heat treatment, thermal assembly and welding, smelting and other processes of metal materials. The induction heating power supply consists of two parts, one is the AC power supply that provides energy, also called the variable frequency power supply; the other part is the induction coil that completes the electromagnetic induction energy conversion, called the inductor. Induction heating power supply not only can heat the whole workpiece, but also localized heating of the workpiece; it can realize deep heat penetration of the workpiece, or it can only concentrate on the surface and surface layer; not only can the metal material be directly heated, but also Indirect heating of non-metallic materials. and many more. Therefore, induction heating technology will be more and more widely used in various industries. A surface heat treatment process in which a workpiece is locally heated by an induced current. This heat treatment process is often used for surface hardening, local annealing or tempering, and sometimes for overall quenching and tempering. With the needs of steel, iron, copper, aluminum and alloy industries, induction melting equipment has been favored. More and more industries are using induction heating equipment, and more and more enter the induction heating equipment industry, more and more The brand entered the Chinese market. In the early 1930s, the United States and the Soviet Union successively applied surface heating to the surface by induction heating. With the development of the industry, the induction heat treatment technology has been continuously improved and the application range has been continuously expanded. Induction heating is the fastest heating method known to man. The traditional heating method is heat conduction, that is, a hot object transfers its own thermal energy to another object, and induction heating is performed by alternating current in the inductor. A current vortex, that is, an eddy current, is generated to move electron holes in the magnetically permeable object in the coil to generate heat. Induction heating is a great revolution in traditional heating methods! 1. Using resonant frequency conversion technology to make the overall efficiency of the equipment ≥90%, high efficiency, energy saving, power consumption is only 20%-30% of the tube induction heating equipment. 2, using IGBT device inverter, high frequency, small size and light weight. The volume and weight are 1/5-1/10 of the thyristor, making it easy to plan, expand, move, maintain and install. 3, using digital phase lock technology to achieve automatic frequency tracking, can automatically adapt to a variety of sensors. 4. Drive module control to ensure the reliability and easy maintenance of the equipment. 5, 80kw high frequency heating power supply without high voltage, high security, safe operation, can work 24 hours a day. 6, easy to install, no need to debug, easy to use. 7. Energy-saving effect is good: Since the switching power supply adopts high-frequency transformer, the conversion efficiency is greatly improved. Under normal circumstances, the efficiency of the thyristor device is increased by more than 10%, and the load rate is less than 70%, which is 30% higher than that of the thyristor device. the above. 8. High output stability: Due to the fast response speed of the system (microsecond level), it has strong adaptability to grid power and load changes, and the output accuracy can be better than 1%. The switching power supply has high working efficiency, so the control precision is high, which is beneficial to improve product quality. 9. The output waveform is easy to be modulated: due to the high operating frequency, the output waveform adjustment is relatively low in processing cost, and the output waveform can be changed more conveniently according to the user's process requirements. This has a strong effect on improving work efficiency and improving the quality of processed products on the job site. Along with the development of power electronic devices, the main circuit topology of the induction heating power supply has been continuously improved, and a fixed AC/DC/AC form has been formed. The induction heating power system connects the mains with a frequency of 50 Hz. After rectification and filtering, it is converted into a constant frequency alternating current by the inverter circuit, and then supplied to the heating coil of the load part, and the heating coil will establish an alternating magnetic field. The structure of the electromagnetic induction heating power supply system is shown in Figure 2.1. The modules that constitute the basic circuit of the induction heating power supply are all the same. The difference is that the power device selection is different, and the circuit selection of the rectification, filtering, and inverter parts is different. As shown in Figure 2.1, the induction heating power supply is generally composed of a rectifier circuit, a filter circuit, an inverter circuit, and some control and protection circuits. The input end of the circuit is three-phase or single-phase AC power. After the rectifier circuit, it becomes a pulsating DC power, and then becomes a smooth DC power through the filter circuit. After that, the inverter circuit becomes the AC power required by the load, and the frequency and power values ​​are all available. Controlled, this forms an induction heating power system. PET Circuit Layer Membrane Switch CIXI MEMBRANE SWITCH FACTORY , https://www.cnjunma.com
Introduction to induction heating power supply