PIEZO-ACTUATOR DRIVE CIRCUIT

摘要

PROBLEM TO BE SOLVED: To highly accurately control supply energy for a piezo-stack without influence of such as environment temperature. SOLUTION: The piezo-actuator drive circuit is constituted to energize the piezo-stack 2 through a transformer 13 from a direct current power source 11, a switching element 14 is provided in the primary side circuit 121 in the energization path 12, a diode 151 is provided so that induction electromotive force generated in the secondary side winding 132 of the transformer is forward bias when the switching element 14 is switched from turn-on to turn-off in a secondary side circuit 122, current of the secondary side circuit 122 is allowed only when the switching element 14 is turned off, and the piezo-actuator drive circuit is regulated by the current of the primary side circuit 121 flowing when supply energy to the piezo-stack 2 is turned on and the inductance of the primary winding 131 of the transformer having temperature dependence.