| 摘要 |
PURPOSE: A circuit for automatically controlling a moving voltage of a capstan motor is provided to automatically switch a power line of a power unit in a special regeneration mode operation process, and to supply proper voltages every generation mode, so as to enhance an impetus. CONSTITUTION: A power unit(10) installs the first/second output terminals(Vcc3,Vcc4) respectively connected with a power terminal and a ground terminal of a capstan motor(30), to supply the first voltage to the capstan motor(30) in a general regeneration mode. The power unit(10) installs the third/fourth output terminals(Vcc1,Vcc2) connected with a power terminal and a ground terminal of a VFD(Vacuum Fluorescent Display)(20), to supply the second voltage to the VFD(20) in the general regeneration mode. A capstan motor power switch(50) connects the second output terminal(Vcc4) with the ground terminal of the capstan motor(30), to supply the first voltage to the capstan motor(30) in the general regeneration mode. The capstan motor power switch(50) connects the fourth output terminal(Vcc2) with the ground terminal of the capstan motor(30), to supply the third voltage to the capstan motor(30) in a special regeneration mode. A microprocessor(40) installs a control port(TRICK) for a control signal output, and outputs control signals of different logic values in the general regeneration mode and the special regeneration mode to the capstan motor power switch(50).
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