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Piezoelectric actuator drive device, electronic device, drive method thereof, drive control program thereof, and recording medium containing the program
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Problems solved by technology
[0007] However, as a result of earnest research by the applicant, the present applicant has obtained a new insight that the frequency characteristic indicating the vibration state of the vibrating body detected from the detection electrode depends on the driving voltage. Therefore, in the driving device of Patent Document 1, even if the feedback Controlling the driving frequency so that the phase difference between the phase of the driving voltage and the phase of the detection signal is close to the preset target phase difference may not be able to apply the optimum driving frequency to the vibrating body of the piezoelectric actuator
That is, in the conventional feedback control, when the driving voltage fluctuates, the frequency characteristics of the vibrating body also fluctuate depending on the driving voltage. Therefore, even if the driving frequency is adjusted according to the preset target phase difference, optimal control cannot be achieved.
Therefore, the range of the driving voltage that can be applied by the piezoelectric actuator is limited, and when a driving voltage exceeding a specific voltage range is applied, there is a problem that the driving efficiency is extremely deteriorated.
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no. 2 Embodiment approach
[0123] Below, according to Image 6 A second embodiment of the present invention will be described.
[0124] Image 6 It is a block diagram showing the drive control device 200 of this embodiment.
[0125] In the second embodiment, in the electronic timepiece 1 having the same structure as that of the aforementioned first embodiment, the drive control device 200 for driving the piezoelectric actuator A of the date display mechanism 10 is different.
[0126] Specifically, in the first embodiment, feedback control is performed in which the target phase difference, which is the target value of the vibration state of the piezoelectric actuator A, is corrected by the correction means, and the corrected target phase difference is compared with the detection signal. Based on the phase difference between SD1 and the drive voltage signal SDR, the drive frequency of the drive voltage signal SDR is changed based on the comparison result.
[0127] In contrast, the second embodiment is ...
no. 3 Embodiment approach
[0141] Below, according to Figure 7-9 A third embodiment of the present invention will be described.
[0142] Figure 7 It is a block diagram showing the drive control device 300 of this embodiment. Figure 8 is a diagram showing an equivalent circuit of the phase shift unit 330 of the drive control device 300 . Figure 9 It is a graph showing the relationship of the phase difference (value indicating the vibration state) between the detection signal SD1 from the vibrator 12 and the drive voltage signal SDR with respect to the drive frequency of the drive voltage signal SDR.
[0143] In the third embodiment, the drive control device 300 for driving the piezoelectric actuator A of the date display mechanism 10 is different from the electronic timepiece 1 having the same configuration as the first and second embodiments.
[0144] Specifically, in the first embodiment, feedback control is performed in which the target phase difference, which is the target value of the vibrati...
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Abstract
An electronic device has a power supply, a piezoelectric actuator A, and a drive control device (100) for controlling the drive of the piezoelectric actuator. The drive control device (100) has: a piezoelectric element facing a vibrating body (12) The drive circuit (111) that provides drive signal SDR; Detect the phase difference detecting unit (120) that shows the phase difference of the vibration state of the vibrating body (12); Correction becomes the comparison voltage setting circuit ( 133); The driving frequency setting unit (140) of comparing the phase difference and the target phase difference changes the driving frequency of the driving signal SDR according to the comparison result so that the phase difference is close to the target phase difference, thereby realizing a voltage independent of the driving voltage High-efficiency drive of electric actuator A.
Description
technical field [0001] The present invention relates to a piezoelectric actuator drive device, an electronic device, a driving method for the electronic device, a drive control program for the electronic device, and a recording medium in which the program is recorded. Background technique [0002] Piezoelectric elements have good conversion efficiency and responsiveness from electrical energy to mechanical energy. Therefore, various piezoelectric actuators utilizing the piezoelectric effect of piezoelectric elements have been developed in recent years. [0003] As this piezoelectric actuator, a vibrating body having a piezoelectric element is used as a main component. Piezoelectric elements on both sides of the reinforcing plate; electrodes for driving provided on the piezoelectric elements; and electrodes for detection electrically insulated from the electrodes for driving. In addition, in a known drive device for a piezoelectric actuator (for example, refer to Patent Doc...
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