| 摘要 |
PURPOSE:To enhance reliability by incorporating a temperature sensing element in a constant-voltage source so that its output voltage may correct the temperature characteristic of the constant d of a piezoelectric element. CONSTITUTION:A constant-voltage source for driving a piezoelectric element is composed of a transformer T, transistors Q, constant-voltage diodes DZ, diodes D, capacitors C, fixed resistance R, and the like, as a ringing choke converter, In this case, a temperature depending resistance element R1, resistances R2-R3, and constant-voltage diodes DZ2-DZ3 are added to the converter. Then, a lowering of performances caused by a mechanical displacement and a generation force variation due to the change of the temperature characteristic of the piezoelectric d constant of a PZT system piezoelectric- element can be prevented by the temperature characteristic of the output voltage of the driving constant-voltage source. |
