| 摘要 |
PURPOSE:To reduce the heat loss by suppressing a limit voltage across a constant voltage diode for input voltage limit lower if a constant current-constant voltage converter for repeater is dismounted. CONSTITUTION:A series circuit where a 1st resistor R1 is connected to the anode of a thyristor Th1 and a series circuit comprising a 2nd resistor R2 and a 3rd resistor R3 are connected in parallel with the constant voltage diode D1 for input voltage limit of the constant current-constant voltage converter 2. Moreover, the gate of the thyristor Th1 is connected to the connecting point of the 2nd and 3rd resistors R2, R3 and a closed loop circuit from the constant current-constant voltage converter 2 is connected to reduce the resistance of the 3rd resistor R3. If the constant current-constant voltage converter 2 is dismounted, the voltage across the constant voltage diode D1 for input voltage limit is suppressed lower. Thus, the production of heat loss is suppressed. |
