| 摘要 |
PURPOSE:To prevent a switching noise from generating by providing a power source voltage switching control circuit which applies the power source voltage of one level at the first charging/discharging level of a charger/discharger and the other power source voltage at the second charging/discharging level to a motor. CONSTITUTION:Since a transistor TR8 is turned OFF when the charging voltage of the capacitor C of a charger/discharger 2 is low in a power source voltage switching circuit 4, a power source V1' is applied as a power source voltage of the first level V1 to a motor drive circuit 5. When the charging voltage of the capacitor C increases, transistors TR6, TR7 are turned ON, and the transistor TR8 are also turned ON. Therefore, the voltage V2' is applied as the power source voltage of the second level V2 to turn ON the transistor TR8. |
