| 摘要 |
PURPOSE:To secure automatically the supply of an optimum current by providing a means to detect the output current of a current driving element with which the relation is obtained between the output current and the input current, and controlling the input curent with reception of the detection output. CONSTITUTION:A current driving element 10 with which the relation is obtained between an output current 18 and an input current 16 is constituted with a photocoupler containing a light emitting element LED and a photodetecting element PT. The current 18 is detected by a detecting circuit 12, and this detection output is fed back to a control circuit 14. Thus the current 16 is controlled a fixed level or a desired level. In such a way, the characteristic variation produced to the parts forming the element 10, a transmission line among these parts can be automatically controlled to keep the output current at a fixed level.
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