公开(公告)号：US4034268A

公开(公告)日：1977-07-05

申请号：US630598

申请日：1975-11-10

申请人： David E. Klauck

发明人： David E. Klauck

IPC分类号： H02H3/50 ,  H02H11/00 ,  H03F1/30 ,  H04R3/00 ,  H02H3/00

CPC分类号： H03F1/305 ,  H02H11/00 ,  H02H3/50 ,  H04R3/007

摘要： A circuit for protecting speakers connected to the output of an audio amplifier. The output of the amplifier is connected to a filter which blocks normal audio frequency signals but passes both high and low frequency signals outside the normal audio range. The positive and negative filter output signals are connected respectively to the inverting and non-inverting inputs of an operational amplifier whose output is connected via a turn-on delay circuit to a speaker relay, which, when closed, connects the speaker to the amplifier. The turn-on delay circuit prevents speaker relay closure until turn-on transients have ended. If a DC voltage or a high frequency signal is present at the amplifier output, the operational amplifier generates a signal to open the relay thereby disconnecting the speaker from the amplifier output. The speaker relay quickly opens when power is turned off so that amplifier turn-off transients are not connected to the speaker either.

摘要翻译： 用于保护连接到音频放大器的输出的扬声器的电路。 放大器的输出连接到滤波器，该滤波器阻止正常音频信号，但通过正常音频范围之外的高频和低频信号。 正和负滤波器输出信号分别连接到运算放大器的反相和非反相输入，其输出通过导通延迟电路连接到扬声器继电器，当关闭时，扬声器继电器将扬声器连接到放大器。 导通延迟电路可防止扬声器继电器闭合，直到接通瞬变结束。 如果在放大器输出处存在直流电压或高频信号，则运算放大器产生信号以打开继电器，从而将扬声器与放大器输出断开。 扬声器继电器在电源关闭时快速打开，使放大器关闭瞬变也不连接到扬声器。