Application of MOSFET Solid State High Frequency Power Supply in Pipe Welding
According to the comparison of solid state high frequency power supply and electron tube high frequency pipe welding power supply, it could be concluded that solid state high frequency power supply is more efficiency, more security, longer life-span and will replace electron tube high frequency pipe welding power supply in not very long time in this field. In this paper, a solid state high frequency pipe welding power supply using MOSFET as the inverter switch components is designed, its operating principle is analyzed, the key technique of section of rectifier and inverter is discussed and the load adaptability, frequency tracking, output power are explained in detail. From the simulation and experiment, it can be seen that the designed method is reasonable and the whole device is high efficiency
A 12 kW/250 kHz series resonant converter for induction heating
The conception and design of a 12 kW/250 kHz series resonant power converter for induction heating applications are described. The developed generator works above resonance in a continuous conduction mode in order to avoid the problem associated with the reverse recovery current of the MOSFETS antiparallel diodes. Both short-circuit protection of the inverter and the real output resonant circuit are described.
Transistorized power supplies for induction heating
In the last five years power MOSFETS have become available which have good radio frequency capability, low drive power requirements and ease of paralleling for higher power output. An induction heating power supply using power MOSFETS as switches is more efficient, is more easily controllable and has a lower capital cost than a valve supply, and the MOSFET power supply is not limited in frequency as thyristor supplies are. This paper gives details of three different types of transistorized power supplies developed for induction heating applications and compares their performances.