| 摘要 |
PURPOSE:To suppress an initial charging current when a power source is turned ON by providing a reference voltage shortcircuiting circuit and a time constant circuit in a reference voltage unit. CONSTITUTION:When an input voltage 10 is applied, the cathode voltage 11 of a Zener diode 3-a rises at the time constant of a resistor 5-1 and a capacitor 6-a. However, no current is flowed to the diode 3-a until arriving at the Zener voltage, and a transistor 1-a remains interrupted state. Therefore, a current is flowed through a resistor 5-i to conduct a transistor 1-e to shortcircuit a reference voltage 12 to become zero. The zero reference voltage is maintained until a controller voltage 11 arrives at the prescribed voltage. Thus, the initial charging current when a power source is turned ON can be suppressed. |
