Patent ID: 8441805
Filing Date: 2013-05-14
Classification: H05K

Abstract:
1. A structure for mounting a compound circuit on a circuit board, the compound circuit including a high voltage circuit having constituents and a low voltage circuit having constituents whose supply voltages are different from each other, the structure comprising: a main circuit board including a low voltage circuit mounting area and a high voltage circuit mounting area on which the constituents of the low voltage circuit and a portion of the constituents of the high voltage circuit are mounted, respectively; and a hybrid IC being arranged over the main circuit board and including a sub circuit board on which a remainder of the constituents of the high voltage circuit are mounted and a coating of a moisture-preventing agent which coats the sub circuit board, wherein both an insulation distance between terminals provided in the high voltage circuit mounting area on the main circuit board for connecting to the hybrid IC and an insulation distance between terminals provided on the hybrid IC and projecting and being exposed from a surface of the moisture-preventing agent for connecting to the high voltage circuit mounting area on the main circuit board are larger than a minimum insulation distance between terminals of the remainder of constituents of the high voltage circuit mounted on the sub circuit board which are disposed inside the coating of the moisture-preventing agent.