| 摘要 |
PURPOSE:To obtain the inexpensive compact driving circuit wherein small capacity element can be used, by controlling the conduction of the brushless motor by an AND value of a signel outputted from a level detector and a detected position signal when a power source voltage is higher than a specified voltage. CONSTITUTION:When the output voltage of a control power source circuit 6, which rectifies the power source of a solar battery 1, is increased to a value higher than VH, the signal is outputted from the level detecting circuit 7. IN an AND circuit 8, said signal and the output of a position detector 2 are operated. Based on the result, a driving element 4 for a stator coil 5 is turned ON through an amplifier 3. Based on said ON state, however, the output voltage of the solar battery 1 is quickly decreased, and the output voltage of the control power source circuit 6 becomes lower than VL (set at a value higher than the lowest operating voltage of the position detector 2) after a specified time T0. Then the driving element 4 is turned OFF, the output voltage of the solar battery is quickly increased, and the voltage of the control power source circuit 6 becomes higher than VH after a specified time T1. Said operation is repeated and the rotation is started. |
