FUNCTIONAL SELF-TEST FOR A PIEZOELECTRIC ELEMENT DEPLOYED IN AN END-PRODUCT

    公开(公告)号:US20190250200A1

    公开(公告)日:2019-08-15

    申请号:US16269788

    申请日:2019-02-07

    Inventor: David CADA

    Abstract: Apparatus and associated methods relate to a functional self-test, including (1) generation of an excitation signal, (2) applying the excitation signal to a unit under test (UUT), the excitation signal including a cyclical signal for a first interval and substantially zero signal for a second interval, (3) determining frequency content of a UUT response signal, and (4) generating a fail result in response to the frequency content below a predetermined threshold. In an illustrative example, the UUT may be a piezoelectric element (PE). The UUT response signal may be processed by a filter, for example. A portion of the filtered UUT response signal, responding to the second interval of the excitation signal, may be analyzed by a fast Fourier transform module (FFTm), for example. In various implementations, the functional self-test may advantageously determine the health of a piezoelectric gas sensing element, periodically, in a field-deployed implementation.

    METHOD FOR VIBRATING A VIBRATION DEVICE
    2.
    发明申请

    公开(公告)号:US20190201934A1

    公开(公告)日:2019-07-04

    申请号:US16232431

    申请日:2018-12-26

    Abstract: A vibration device includes a piezoelectric element, a vibration member to which the piezoelectric element is bonded, and a wiring member connected with the piezoelectric element. A method for vibrating the vibration device includes inputting a signal including a fundamental frequency component to the piezoelectric element through the wiring member, and vibrating the vibration device in a vibration mode that includes the fundamental frequency component and does not approximately include a high order frequency component that is n times (n represents an integer of 2 or more) the fundamental frequency component. The fundamental frequency component is lower than the resonance frequency component of the vibration device.

    PIEZOELECTRIC MIRROR SYSTEM
    3.
    发明申请

    公开(公告)号:US20190121121A1

    公开(公告)日:2019-04-25

    申请号:US15793819

    申请日:2017-10-25

    Abstract: A piezo MEMS mirror system that includes a drive system that drives a piezo MEMS mirror that generates an image on a portable device display. The drive system includes a DC-AC converter that operates to convert the DC power provided by the battery to AC power. The DC-AC converter may generate the AC power having a peak voltage that is at an intermediate level—being between the DC voltage of the battery, and the peak AC voltage generated by the drive system. The drive system also includes an output filter that uses a series-coupled inductance system (perhaps inductively coupled inductors in a differential mode circuit) in conjunction with a capacitance of the piezo MEMS mirror (and perhaps tuning capacitors to account for mirror fabrication deviations) to amplify the AC voltage of the AC power at a mechanical resonant frequency of the piezo MEMS mirror.

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