Q&A: What is the difference between dielectric heating and induction heating?

What is the difference between dielectric heating and induction heating?

Regarding high-frequency dielectric heating, the applicator is equipped with two electrodes that create a high-frequency electric field, and the workpiece placed between these two electrodes is heated by the electric field. The electrodes are connected to the oscillator using wires, but since radio waves leak from the wires to the outside, measures are needed not only for safety but also to comply with the strict regulations of the Radio Law. Microwave heating also heats the workpiece using an electric field, but does not require electrodes. Since a waveguide is used to connect the oscillator to the applicator, radio waves do not leak to the outside. High-frequency induction heating utilizes the heat generated by metals affected by high-frequency magnetic fields through Joule loss and hysteresis loss. A representative example of high-frequency induction heating is the induction heating (IH) cooker. When a thick metal pot is placed on the IH cooker and the switch is turned on, high-frequency current flows through the coil, generating a high-frequency magnetic field. The pot heats up due to Joule loss and hysteresis loss caused by the generated high-frequency magnetic field, thereby cooking the food inside the pot. In other words, the IH cooker directly heats only the pot with the high-frequency magnetic field. In contrast, a microwave oven directly heats food with microwaves. For more details, please contact us or download the catalog.

High frequency/microwave parts