| 摘要 |
PURPOSE:To improve the efficiency of a power supply by returning energy stored in a motor to said power supply at the time of phase-switching of said motor. CONSTITUTION:When a transistor(Tr) 8 is turned OFF in the case where Trs 8, 10 are ON and Tr 9 is OFF, a current flowing through Tr 10, motor, diode 6 and Tr 8 passes Tr 10, motor and diode 4 to flow into a high-voltage power supply 2. Therefore, energy stored in said motor is stored in said high-voltage power supply so that the efficiency of said power supply is improved. Further, when said Tr 10 is turned OFF simultaneously with said Tr 8, the current passes diode 11, motor and diode 4 and returns to the high-voltage power supply. In this case, the disappearance of said current quickens to facilitate phase- switching of said motor. |
