| 摘要 |
To provide a piezo-electric actuator drive circuit capable of efficiently driving a piezo-electric actuator. The present invention is a piezo-electric actuator drive circuit (3) for driving a piezo-electric actuator (2) in which a drive voltage is applied to polarizing sections (4a, 4b), and includes a high voltage power supply (14), a high-side switching element (16), a low-side switching element (18), and a switching element control circuit (12) for applying a voltage pulse to polarizing sections and driving the piezo-electric actuator by switching between a voltage-applied period in which only the high-side switching element is in a conductive state, a floating period in which both the high-side switching element and the low-side switching element are in a nonconductive state, and a grounded period in which only the low-side switching element is in a conducting state.
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