Patent ID: 8993941
Filing Date: 2015-03-31
Classification: H05B

Abstract:
1. An induction heating device comprising: a top plate on which a to-be-heated object is allowed to be placed; plural induction heating coils for inductively heating the to-be-heated object, the induction heating coils being placed just under the top plate; plural inverter circuit boards for supplying high-frequency currents to the plural induction heating coils, respectively and comprising plural inverter circuits mounted thereon; and cooling portions comprising a blowing port for blowing cooling air to the plural inverter circuit boards, each blowing port associated with and corresponding to each inverter circuit board; wherein the plural inverter circuits on each inverter circuit board are placed under the plural induction heating coils with an air-flow blowing path formed there between and cooling air flows from each cooling portion through the air-flow blowing path space, the plural inverter circuits on each inverter circuit board arranged side by side forming a longitudinal row and the cooling air flowing along the longitudinal row of the plural inverter circuits, wherein each of the plural inverter circuits comprises: wherein fin areas of the plural inverter circuits are arranged side by side to form a longitudinal row of the fin areas in each inverter circuit board and mounted-component areas of the plural inverter circuits are arranged side by side to form a longitudinal row of the mounted-component areas in each inverter circuit board, wherein the blowing port corresponding to each inverter circuit board is arranged to send cooling air directly both to the longitudinal row of the fin areas and the longitudinal row of the mounted-component areas through a respective air-flow blowing path formed in the fin areas and the mounted-component areas; wherein the cooling air having passed through one of the fin area continues to flow through the longitudinal row of the remaining fin areas in a first cooling path, and the cooling air having passed through one of the mounted-component areas continues to flow through the longitudinal row of the remaining mounted-component areas in a second cooling path, respectively, the longitudinal row of the fin areas being spaced apart and separated from the longitudinal row of the mounted-component areas such that the first cooling path and the second cooling path are separated from each other in each inverter circuit board, and the cooling air flowing in the first cooling path has a volume larger than a volume of the cooling air flowing in the second cooling path, wherein the cooling air flowing in the first cooling path and the cooling air flowing in the second cooling path flow in the same direction.