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    Method for rapidly exciting and sustaining oscillations in a resonant system
    141.
    发明授权
    Method for rapidly exciting and sustaining oscillations in a resonant system 失效
    在谐振系统中快速提升和持续振荡的方法

    公开(公告)号：US3826993A

    公开(公告)日：1974-07-30

    申请号：US7346170

    申请日：1970-09-18

    Applicant: BRAFTON CORP

    Inventor： WHITE R

    IPC: B01D51/08 ,  B06B1/02 ,  H03L7/00 ,  H03B3/04

    CPC classification number: H03L7/00 ,  B01D49/006 ,  B01D51/08 ,  B06B1/0261 ,  B06B2201/53 ,  B06B2201/70

    Abstract: Method and apparatus for initiating and sustaining oscillations in a system having a free oscillatory period, comprising an oscillating means (preferably including a relaxation oscillator of the resistor-capacitor type) connected to apply a periodic driving force to the system, the oscillating means having an intrinsic period approximately equal to the period of the system, a detector connected to sense operation of the oscillating means and the oscillations, if any, of the system and to detect a phase difference therebetween, and circuitry with an input connected to the detector, the circuitry connected to the oscillating means to be effective to modify the oscillations of the oscillating means so as to maintain the phase difference within predetermined limits.

    Abstract translation: 用于在具有自由振荡周期的系统中启动和维持振荡的方法和装置，包括连接以向系统施加周期性驱动力的振荡装置（优选地包括电阻器 - 电容器类型的张弛振荡器），振荡装置具有 固有周期大约等于系统的周期，连接到感测振荡装置的操作的检测器和系统的振荡（如果有的话），并检测它们之间的相位差，以及具有连接到检测器的输入的电路， 连接到振荡装置的电路有效地修改振荡装置的振荡，以便将相位差保持在预定限度内。

    ELECTRIC HORN WITH SOLID STATE DRIVER
    149.
    发明公开
    ELECTRIC HORN WITH SOLID STATE DRIVER 无效
    电动马达与固态驱动器

    公开(公告)号：EP0452427A4

    公开(公告)日：1992-05-13

    申请号：EP90911125

    申请日：1990-06-11

    Applicant: SPARTON CORPORATION

    Inventor： YOON, YOUNG, SONG

    IPC: G10K9/13 ,  B06B1/02 ,  G10K9/15 ,  G10K9/12

    CPC classification number: B06B1/0223 ,  B06B2201/53

    Abstract: An electric horn (50) having a diaphragm (14) connected to a ferromagnetic plunger (16) is driven by an electromagnetic coil (36) to cause vibrations of the diaphragm (14) at the resonant frequency of the diaphragm and plunger combination. A solid state driver (58) has a timer (70) tuned essentially to the frequency of the diaphragm assembly and controls the driver power output to effect coil energization to drive the diaphragm movement synchronously with the timer frequency. The driver output stage comprises a power MOSFET (80) or a Darlington pair.

    Electronically controlled horn for motor vehicles
    150.
    发明公开
    Electronically controlled horn for motor vehicles 失效
    电动车用电子控制杆

    公开(公告)号：EP0389860A3

    公开(公告)日：1991-09-11

    申请号：EP90104674.8

    申请日：1990-03-12

    Applicant: ELECTRONSYSTEM S.p.A.

    Inventor： Giorgioni, Tullio ,  Cortinovis, Bruno

    IPC: G10K9/13

    CPC classification number: B06B1/0261 ,  B06B2201/53

    Abstract: A horn comprising a diaphragm (M) and electromagnet (E), of the type comprising a transducer (S) to sense the vibrations of the diaphragm (M) and feed a vibration-dependent electrical signal to a feedback circuit which controls the power supply to the electromagnet (E), said feedback circuit comprising an electronic power circuit (E, IEP) controlled by means (µ, F, CCS) arranged to adapt, condition and process the electrical signal from the transducer (S) in such a manner as to automatically determine the frequency and duty cycle for controlling the electronic power circuit (IEP) under the various environmental, electrical feed and constructional tolerance conditions of the horn (X).

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