| 摘要 |
PURPOSE:To operate a transmission apparatus at a random position on a distribution line, by detecting load current of the distribution line through a current transformer then feeding differential potential produced on a load of the current transformer to a constant voltage means and employing the output from the constant voltage means as secondary voltage. CONSTITUTION:When load current (i1) flows through conductor 1, flux is produced in a core 6 and secondary current (i2) flows through a secondary coil 7 to produce voltage V2 across a load 3. Voltage V2 is rectified through a rectifying circuit 4 to produce rectified voltage V0 which is fed to a constant voltage circuit 5. The constant voltage circuit 5 produces a constant reference voltage Vb through a Zener diode Tz even upon fluctuation of rectified voltage V0 due to fluctuation of load current(i1), and the reference voltage Vb is applied to the non-inverting input of an operational amplifier Op which produces a constant voltage Va. Thus produced voltage Va is subjected to current amplification with constant voltage through emitter follower transistors T1, T2 to produce a constant voltage output Vs which is fed to a transmission apparatus. |
