发明名称 Piezo harn self-oscillating drive circuit
摘要 A circuit is disclosed for driving a piezo ceramic device as used in smoke alarms or other audio warning devices. The circuit detects the resonant frequency of the piezo horn and provides an alternating current at the resonant frequency of the horn for maximum sound output. The circuit has a self starting resonant oscillation characteristic. Two pairs of switches act in concert to alternatingly connect each side of the piezo horn to the supply voltage and ground, causing the maximum voltage swing across the piezo horn to be effectively twice the available power supply voltage.
申请公布号 US4496914(A) 申请公布日期 1985.01.29
申请号 US19810321281 申请日期 1981.11.13
申请人 TEXAS INSTRUMENTS INCORPORATED 发明人 ANDRESEN, BERNHARD H.;SCHENCK, STEPHEN R.;KENNEDY, NATHAN R.
分类号 G10K9/122;B06B1/02;G08B23/00;H03B5/36;(IPC1-7):H03B5/36 主分类号 G10K9/122
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