| 摘要 |
A power generating apparatus (100) is provided with a power generating unit (1), an inductor (L), a switch (SW) connected in series to the inductor (L), and a control circuit (3). The power generating unit (1) includes a piezoelectric element (11), and an upper electrode (112) and a lower electrode (113), which are formed on a surface of the piezoelectric element (11). The inductor (L) is electrically connected in parallel to the upper electrode (112) and the lower electrode (113), and constitutes a resonant circuit with a capacitance component of the piezoelectric element (11). The control circuit (3) has drive mode, in which the switch (SW) is brought into the on-state in synchronization with timing when a voltage generated in the piezoelectric element (11) is at an extreme value, and stop mode, in which the switch (SW) is brought into the off-state at the timing when the voltage is at an extreme value. In the cases where frequency of vibration is the natural frequency of the power generating unit, the control circuit (3) inserts a control in the stop mode during a time when control in the drive mode is being performed. |
