POWER SUPPLY EQUIPMENT FOR DRIVING PIEZOELECTRIC ACTUATOR

Title:

POWER SUPPLY EQUIPMENT FOR DRIVING PIEZOELECTRIC ACTUATOR

Document Type and Number:

Japanese Patent JP3643206

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide power supply equipment for driving a piezoelectric actuator which can reduce frequency dependence and rounding of a voltage waveform amplitude, and also can prevent damage to a circuit element in the power supply equipment.
SOLUTION: A peak value of a current I flowing to a piezoelectric actuator element 3 is detected by a peak current detecting circuit 22 and inputted to a control circuit 25 through an insulated coupling element 27, and, when the peak value of the current I exceeds a set value ITH, a control signal S2 is sent out from the control circuit 25 to a switching element 21 through an insulated coupling element 26. As a result, the switching element 21 is put in an OFF state in a short time of 10μsec or below and the current I is cut off.

Inventors:

Hiroyuki Ishikawa
Mutsuta Mutsuo
Yoshikazu Naoi

Application Number:

JP6366997A

Publication Date:

April 27, 2005

Filing Date:

March 17, 1997

Export Citation:

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