(1) From the perspective of the circuit, the large-capacity product of the induction heating power supply is divided into two categories: one is the series of devices; the second is the string of multiple power supplies. In the serial parallelism of the device, a series of average flow must be processed. Due to the discreteability of the device manufacturing process and parameters, the number of devices is limited, and the reliability of the device and the string parallel numbers are inversely proportional. Sceral parallelism techniques for multiple power supplies are effective means of further larger capacity on the device skewers, and can simply pass the series parallel operation in the case of a single capacity in accordance with a reliable power series in parallel technology. A capacity device, each stand-alone is just a unit (or a module) of the device.
The series inverter output can be equivalent to a voltage source of low impedance. When the two voltage sources are paid in paid, the amplitude, phase, and frequencies will result in a large circulation, so that the current of the inverter device is seriously uneven. Therefore, the series inverter is difficult to expand: the inverter, the direct current of the inverter input is large, the reactor can act as the current buffer between the parallels, so that the input AC / DC link is sufficient. Time to correct the deviation of DC current, reaching the multi-machine parallel to expand.
(2) Currently, induction heating power supply mainly uses a thyristor in the medium frequency section, the supersonic band is mainly IGBT, and the high frequency band, with the MOSFET and IGBT performance constantly improve, Si 'will lose value. Induction heating power supply resonance inverter can implement soft switches, but due to large power, the power is soft switches, but due to the general power, power devices, passive devices, cables, wiring, ground shielding, etc. There are many special requirements, especially high-frequency power supplies. Therefore, it is further discussed to achieve high frequency of induction heating power supply.
(3) Induction heating power supply is used in the industrial site, its operating conditions are more complex, it has very close contact with the steel, metallurgy and metal heat treatment industries, and its load object is wide, and the power supply inverter and load It is an organic whole, and the load directly affects the operating efficiency and reliability of the power supply. For support, surface heat treatment, etc., generally adopted a matching transformer to connect the power supply and load sensor, the matching voltage for high frequency, super audio power supply requires small explosion, how to achieve the efficiency of matching transformers, from magnetic materials to windings The design has become an important topic. In addition, the load structure from the circuit topology replaces the original two passive components in three passive components to replace the matching transformer to achieve efficient, low cost isolation matching transformer achieves efficient, low cost isolation.
(4) As the degree of automation of induced heat treatment production line and the high reliability requirements of power supply, the induction heating power supply is developing toward the intelligent control direction. With computer intelligent interface, remote control, fault automatic diagnosis, etc., the sensing heating power supply, which is the next generation of development goals.
(5) Since the power supply of induction heating is very powerful, there is no specific requirement for its power factor and harmonic pollution indicators. However, with the improvement of reactive power grid reactive and harmonic pollution requirements, high-power three-phase power factor correction technique) and the low harmonic pollution power must be the future development trend.

6) Today's high-tech rapid development, new materials, new processes continue to emerge, and induction heating is an important research and development and processing means. Therefore, induction heating power is an indispensable equipment for some high-tech R & D centers. It is possible to say that with the development of science and technology, induction heating power supply will have a broader application in high-tech. In this field, the reliability and controllability of the induction heating power supply is higher. How to design a high-power ultra-high frequency, high-performance induction heating power supply is an important topic of power electronic science and technology workers.