After recent years of development, super audio induction heating power supplies are developing in the direction of modularization, high frequency, high power and intelligence on the basis of old-fashioned power supplies, as well as in the direction of energy saving and low harmonic pollution. This is specifically reflected in the following aspects:
(1) In addition to thyristors, inverter devices increasingly use IGBTs (4500~7000V) that can withstand high voltages as the switching devices of the inverter, so that the inverter can work under high DC voltage. Advantages The anode current of the same power is small, the inverter conversion efficiency is high, and the line loss is small, thereby achieving the purpose of energy saving. IGBT has been widely used in high-power medium-frequency and super-audio induction heating power supplies, while MOSFET has been widely used in high-frequency, medium- and high-power induction heating power supplies.
(2) The combined power output can easily increase the output power, and the output power can reach (1~2) x l04KW.
(3) In addition to the traditional 6-pulse (three-phase controllable or three-phase uncontrollable rectification) super-audio power supply, 12-pulse and 24-pulse super-audio power supplies have been widely used, which can reduce harmonic pollution to the power grid. . The total harmonic square mean of the three-phase 6-pulse wave, the three-phase 12-pulse wave, and the three-phase 24-pulse wave is approximately equal to 4.20%, 1.03%, and 0.26% of the average DC current respectively.
(4) Intelligent control systems are widely used to control the ultrasonic induction annealing power supply. This includes: ① Intelligent controllers, such as using DSP as the core to design digital controllers. ②Intelligent control algorithms, in addition to the traditional PID control algorithm, there are also adaptive control algorithms, fuzzy control algorithms, BP (Back Propagation) neuron network control algorithms, etc. ③ Use standardized signal transmission methods, such as industrial control buses CAN-US and PROFIBUS, optical fiber signal transmission, etc. This signal transmission method can reduce the impact of interference signals on the control signal and improve the stability of the controller.
(5) The ultrasonic induction heating power supply has been greatly improved in terms of power and frequency.
(6) There are more and more power adjustment methods for ultrasonic induction heating power supplies, which are easy to select and use.
(7) There are more and more researchers and engineering technicians from various disciplines (such as metal materials and heat treatment, welding, automatic control disciplines, electronic information and electronic technology applications, etc.) working on circuit controllers for ultrasonic induction heating power supplies. And research on control algorithms, which will be beneficial to the development of induction heating power supplies in my country.
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GS-ZP-1200
