With the rapid development of science and technology, the traditional gas stove that needs to be heated by an open fire is no longer a necessity in people’s lives. In pursuit of a higher quality of life, people use no open fire, no exhaust emission, no noise, and greatly reduce the greenhouse effect. and other characteristics of the induction cooker, greatly improving the kitchen environment. As a high-power electric heating device, more than 80% of the components of the induction cooker are electronic components, which also have heating problems. The internal temperature requirements of the work are quite strict. If the heat dissipation is poor, it will cause a high failure rate and poor stability of the product; It is a major difficulty that hinders the development of the household appliance induction cooker industry.
The induction cooker uses the principle of electromagnetic induction to achieve heating. It uses alternating current through the coil to generate an alternating magnetic field whose direction changes continuously, and eddy current is generated inside the conductor in the alternating magnetic field, and this is the eddy electric field that pushes the conductor. due to the movement of medium carriers. The Joule effect of the eddy current increases the temperature of the conductor, thereby achieving heating.
The heat dissipation structure of the induction cooker for household appliances includes the shell of the induction cooker, the circuit board and the coil disc, the cooling fan, and the heating components; the bottom or side of the base is provided with an air inlet and an air outlet, and the circuit board and the coil disc are assembled and fixed on the base, and the circuit board is installed on the base. Between the coil disk and the coil disk, at least one fan is assembled and fixed on the base; after the external air enters from the air inlet, the air flow first passes and cools the circuit board, then blows to the coil disk through the fan, and finally flows out from the air outlet. Through reasonable component layout design, the airflow loss can be effectively reduced. At least one fan is placed between the circuit board and the coil disk on the airflow path, so that after the outside air enters from the air inlet, the airflow first passes through and cools the heat source components on the circuit board. , The airflow is then blown to the coil disk through the fan, and finally flows out from the air outlet. The formed internal flow field is uniform and the airflow loss is small. It is easy to control the flow field to effectively pass through the heat source, thereby improving the heat dissipation efficiency and obtaining a more ideal overall heat dissipation effect.
The heat dissipation methods of the induction cooker for household appliances are air-cooled and water-cooled, usually using an air-cooled + radiator structure. Components such as IGBTs and bridge stacks are high-power devices that generate a lot of heat during operation.
In order to better solve the problem of heat dissipation inside the induction cooker, it is required to improve the heat exchange efficiency of the induction cooker as much as possible and reduce the heat transfer resistance of the contact surface in a limited space. Thermally conductive material that allows the heat from the heat source to be transferred to the heat dissipation housing more quickly.
Cohetion’s thermal management materials can well solve the reliability and electromagnetic compatibility problems of heating components such as induction cooker circuit boards and coil discs in complex environments. In view of the high thermal conductivity requirements of the induction cooker for thermally conductive materials, the main materials recommended by Nuofeng are thermally conductive silicone sheets and thermally conductive silicone grease and other heat dissipation solutions.
Thermal grease heat dissipation paste is coated on the heat dissipation area of the induction cooker, which effectively increases the heat transfer area and increases the heat dissipation effect, thereby ensuring the stability of the electrical performance of the induction cooker.