Title:
圧電素子の充放電のための方法及び装置
Document Type and Number:
Japanese Patent JP5064607
Kind Code:
B2
Abstract:
Because the capacitance of a piezoelectric actuator 1 changes with temperature and age, the charge delivered to it must be adjusted to achieve a consistent driving voltage and hence a consistent extension. The potential Up across the actuator after charging is measured and the operation of the half-bridge 3-6 in the subsequent charging cycle is adjusted accordingly. Alternatively, the charging time required to achieve a predetermined voltage may be measured and the charging current for the next cycle adjusted accordingly. Changes in the charging current can also be made within a charging cycle.
Inventors:
Jörg Reinecke
Alexander hook
Alexander hook
Application Number:
JP3275299A
Publication Date:
October 31, 2012
Filing Date:
February 10, 1999
Export Citation:
Assignee:
ROBERT BOSCH GMBH
International Classes:
F02M51/00; H01L41/09; F02D41/20; H01L41/04; H02N2/00; H02N2/06
Domestic Patent References:
| JP3065066A | ||||
| JP5344755A | ||||
| JP2046784A | ||||
| JP5169686A | ||||
| JP4071858A |
Attorney, Agent or Firm:
Takuya Kuno
Toshio Yano
Takahashi
Kimihiro Hoshi
Hiroyasu Ninomiya
Ryoichi Shino
Einzel Felix-Reinhard
Toshio Yano
Takahashi
Kimihiro Hoshi
Hiroyasu Ninomiya
Ryoichi Shino
Einzel Felix-Reinhard