Title:
PIEZOACTUATOR DRIVING CIRCUIT
Document Type and Number:
Japanese Patent JP3765286
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To control inputted energy to a piezostack.
SOLUTION: The piezostack 4A is charged by a capacitor 32 via an inductor 34 when a switching element 35, which is switched on and off repeatedly, is in an 'on' period, and in an 'off' period, it is charged by bypassing the capacitor 32 by a diode 361 to cause a flywheel current to flow. In this circuit, by setting a controller 212 that controls the switching element 35 in such a way that the length of the 'on' period takes a constant value and that the turning-on of the switching element 35 is inhibited until a reference time elapses from the start of charging the piezostack on a second 'on' period, energy inputting characteristics from the second 'on' period onward are equalized, even if a capacity change in the piezostack 4A disperses a time required for reaching prescribed energy at the initial period of the start of charging, in particular during the first 'on' and 'off' periods.
Inventors:
Hideo Naruse
Application Number:
JP2002121694A
Publication Date:
April 12, 2006
Filing Date:
April 24, 2002
Export Citation:
Assignee:
株式会社デンソー
International Classes:
F02M51/06; H02N2/00; F02D41/20; H01L41/083; (IPC1-7): H02N2/00; F02D41/20; F02M51/06; H01L41/083
Domestic Patent References:
| JP10308542A | ||||
| JP2002021621A |
Attorney, Agent or Firm:
Motomu Itou
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