| 摘要 |
PURPOSE:To constitute a small-sized, lightweight high frequency part with low power consumption by providing a voltage frequency converter which outputs a signal of oscillation frequency corresponding to the voltage of a DC power source which is received by a high frequency part to the high frequency part through a coaxial cable, detecting the voltage drop on the coaxial line from the oscillation frequency of a voltage frequency converter, and controlling the DC power source of a control power source part so that the voltage drop is compensated. CONSTITUTION:The generated frequency of a V/F converter 4 for the receiving terminal voltage of the high frequency part A increases above a specific generated frequency and the output voltage of the F/V converter 11 of a control part B drops. This voltage is detected and a power source 10 is so controlled as to raise the output voltage to the high frequency part of a control power source part B, thereby raising the receiving terminal voltage of the high frequency part A. Further, when the receiving terminal voltage is lower than a specific voltage, this operation is repeated until the voltage attains to the specific voltage. Thus, the output voltage of the control power source part B is controlled so that the receiving terminal voltage of the high frequency part A becomes constant. Consequently, the power consumption of the high frequency part is reduced and a heat sink is reduced in size. |
