Patent ID: 8585168

Claim:
A discharge energy recovery device to recover discharge energy discharged from a piezoelectric element when the piezoelectric element is driven, comprising: a drive voltage generator to generate a voltage to drive the piezoelectric element; a discharge voltage monitoring unit to monitor a discharged voltage discharged from the piezoelectric element when the piezoelectric element is driven by the drive voltage generator; a first current supplier to supply a given current energy to operate a first load circuit when the discharged voltage is equal to or greater than a first voltage that enables driving of the first load circuit by monitoring the currently discharged voltage using the discharge voltage monitoring unit; and a second current supplier to supply a given current energy to operate a second load circuit when the discharged voltage is less than the first voltage and equal to or greater than a second voltage that enables driving of the second load circuit by monitoring the currently discharged voltage using the discharge voltage monitoring unit, the given current energy to operate the first load circuit being different from the given current energy to operate the second load circuit.