What electromagnetic effects are required for the induction heating power
What electromagnetic effects are required for the induction heating power supply to maintain operation?
The induction heating power supply is based on the principle of electromagnetic induction. It is an energy-saving and efficient heating solution developed by Dongguan Zhifa 20 years ago. It has already achieved many outstanding achievements in different frequency bands such as high frequency and intermediate frequency. breakthrough. However, for newcomers who are just beginning to work on the development of heating power products, the first thing that should be done is to fully understand the electromagnetic effect principles used in the induction heating process, and what role these principles have played in the operation of the entire heating system.
Let us now analyze and see which electromagnetic effects maintain the normal operation of the induction heating power supply, Fifi.
In the process of induction heating, the skin effect is one of the important electromagnetic effect principles for maintaining the normal operation of the heating power supply. The so-called skin effect means that when a direct current flows through a conductor, the current is evenly distributed across the conductor cross section, but when an alternating current flows through the conductor, the distribution of the current along the conductor cross section is uneven, and the maximum current density appears in the conductor. Surface layer. The phenomenon that this current accumulates on the surface is called the skin effect.
The skin effect is inextricably linked to the principle of alternating current and electromagnetic induction. When the circuit of the heating power source is turned on, the alternating current passes through the conductor, and an alternating magnetic field is established on the outside and inside of the conductor. Since the magnetic flux of the part of the conductor surface is less than the magnetic line of the chain inside the conductor. Therefore, the self-inductance potential of the central portion of the conductor or the inductance and impedance of the central portion is greater than the inductance and impedance of the surface portion. Since the current always flows along the path with the smallest impedance, the current accumulates on the surface of the conductor. The higher the current frequency, the more pronounced the skin effect.
The second effect of maintaining the normal operation of the induction heating power supply is the proximity effect. The so-called proximity effect means that when two adjacent conductors are connected to an alternating current, the current in the conductor is re-arranged under mutual influence. When the two currents flow in the same direction, the current is discharged outside the conductor. When the flow is reversed, The current is discharged inside the conductor. The figure below is a schematic diagram of the proximity effect.
The above is the summary and analysis of the two common two basic electromagnetic effects of induction heating power supply, hoping to help newcomers to complete the new product development and design work more comprehensively.