| 摘要 |
PURPOSE:To improve heat radiation and also set the interval between insulated metallic boards accurately and simplify the manufacturing process by mounting the circuit on the primary side and the circuit on the secondary side of first and second insulated metallic boards, and coupling them by a photocoupler. CONSTITUTION:The circuit on the primary side and the circuit on the secondary side are formed on insulated metallic boards, which are united by a bridge, and thereon integrated circuits, elements, etc., are mounted. A photocoupler 50 is fixed to straddle a rectangular extra hole. For a variable resistance element 52, a variable resistance element for surface mounting is used, and a hole is made in a casing 10, or through an extra hole it is fixed in such arrangement that the adjustment is possible. Next, the bridge part is stamped out and removed by a press, thereby dividing it in two sheets of hybrid integrated circuit boards 20 and 20, and the margins are fixed to the step of the casing 10. The coupling with a transformer is performed through leads 56 and 58, and the feedback of a signal is performed by the photocoupler 50.
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