| 摘要 |
PURPOSE:To continuously supply a voltage in response to a load even when a main power source is failed by connecting the first voltage controller to a main power source and the second voltage controller to a spare power source, and selecting them via a switch having diodes. CONSTITUTION:Rectifiers 41A, 41B of the first voltage controller are connected to a bus W, inverters 42A, 42B are connected via diodes 70A, 70B, a DC/DC converter 51 is connected to a storage battery 50, the output is connected via diodes 52A, 52B to inverters 42A, 42B, thereby driving motors 8A, 8B. Only a main power source W is used at the normal time and only the storage battery 50 to is used at the main power failure time by the switching operations of diodes 52A, 52B, 70A, 70B. Accordingly, the power source can be automatically switched at the power interruption time without almost varying the frequency and voltage level in a simple construction. |
