Apparatus and method for driving piezo actuator of smooth impact drive mechanism
AssigneeCREPAS Technologies Co., Ltd.
InventorsSung Jun Joo, Chang Jun Oh
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Abstract
The present disclosure relates to an SIDM piezo actuator driving apparatus and a method thereof, and the present disclosure provides an apparatus and a method for driving the SIDM piezo actuator capable of reducing heat generation and power consumption by removing the inrush current into the piezo actuator and capable of improving the vibration speed by increasing the applied voltage.
Claims9
A piezo actuator driving apparatus comprising:
- a first main switch and a second main switch connected in series between a first voltage and a second voltage, and having a contact point connected to one end of an inductor;
- a third main switch and a fourth main switch connected in series between the first voltage and the second voltage, and having a contact point connected to the other end of the inductor;
- and
- a first resonance switch, the piezo actuator, and a second resonance switch connected in series between one end and the other end of the inductor,
- wherein a resonance loop is formed by connecting the piezo actuator and the inductor in a resonance period during which the first resonance switch and the second resonance switch are turned on, thereby providing energy pre-charged in the inductor to the piezo actuator.
A piezo actuator driving method for controlling the positional displacement of a slider into which a driving rod is inserted by driving a piezo element according to a driving signal to vibrate the driving rod coupled to the piezo element, the method comprising:
- inputting a driving signal for driving the piezo actuator as a square wave;
- determining the forward or backward movement of the piezo actuator vibration according to the sum of high sections and the sum of low sections within one cycle of the driving frequency of the square wave;
- and
- inserting an additional pulse for generating harmonics at the midpoint of the low section within one cycle of the driving frequency.
A piezo actuator driving method of a driving apparatus that performs a forward drive in which a first voltage and a second voltage are respectively applied to a first electrode and a second electrode of a piezo actuator, and a reverse drive in which opposite voltages are respectively applied thereto,
- the driving apparatus comprising:
- a first main switch and a second main switch connected in series between the first voltage and the second voltage, and having a contact point connected to one end of an inductor;
- a third main switch and a fourth main switch connected in series between the first voltage and the second voltage, and having a contact point connected to the other end of the inductor;
- and
- a first resonance switch, the piezo actuator, and a second resonance switch connected in series between one end and the other end of the inductor, and
- the method comprising:
- (A) turning on the first main switch and the fourth main switch for the forward drive;
- (B) turning on the third main switch and the second main switch for the reverse drive;
- and
- (C) as a resonance operation, turning on the first resonance switch and the second resonance switch between the forward drive and the reverse drive,
- wherein a resonance loop is formed by connecting the piezo actuator and the inductor in the resonance operation, thereby providing energy pre-charged in the inductor to the piezo actuator.
Dependencies are inferred from the claim text.