| 摘要 |
PURPOSE:To protect transistors, etc. from damage in such a way that in a control circuit of an electromangetic driving equipment to drive each type of door for an air conditioner, a transistor to be operated by output of arithmetic amplifiers by which a transistor for controlling said equipment is controlled. CONSTITUTION:In case where an air-mix door 2 is driven and controlled by means of a motor 18, a control circuit compares respectively positional signals VIN from a detecting circuit 3, their reference signals VH and VL by means of amplifiers 1, 10. In case of VIN>VH, a motor 18 is driven by turning transistors 12, 19 ON, and in case of VL<VIN<VH, the motor 18 is stopped by turning transistors 5, 12 ON and transistors Tr 9, 16 OFF, besides, in case of VIN<VL, the motor 18 is controlled to make reverse revolution by turning transistors Tr5 16 ON. In this case, further Tr27, 29, 33, 35 are added, Tr29 is controlled by Tr27, and Tr5 is operated on the basis of the operation of Tr29. And it is constituted so that Tr35 is controlled by Tr33, and Tr12 us operated on the basis of the operation of Tr35. |
