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    • 57. 发明授权
    • Protection circuit for an audio amplifier
    • 音频放大器保护电路
    • US5847610A
    • 1998-12-08
    • US760026
    • 1996-12-04
    • Shinichi Fujita
    • Shinichi Fujita
    • H04R3/00H03F1/52H03F3/20
    • H03F1/52H03F2200/462H03F2200/471
    • In a protection circuit for an audio amplifier, a power relay is provided on a primary side of a power source of the audio amplifier. When a power switch has instructed power-on, a drive power is supplied from an auxiliary power source to the power relay by an instruction given by a control section which is supplied with an operating power thereby to turn on the power relay. A primary voltage is thereby supplied to the power source to set the audio amplifier to a power-on state. When the audio amplifier is in the power-on state, an excess current flowing in an output stage of a power amplifier and dc voltage occurring in an output signal line of the power amplifier and, if necessary, an abnormal voltage occurring in the power source are detected and the power relay is cut off by an instruction from the control section when either one of the abnormalities takes place whereby a primary side of the power source is accurately cut off when an abnormality has occurred. According to the invention, since the primary side of the power source is accurately cut off when abnormality has occurred, damage to circuit elements and loudspeakers can be prevented even when abnormality has occurred in the power source.
    • 在用于音频放大器的保护电路中,功率继电器设置在音频放大器的电源的初级侧。 当电源开关指示电源接通时,通过由提供有操作功率的控制部分给出的指令从辅助电源向功率继电器提供驱动电力从而接通电源继电器。 因此,将一次电压提供给电源以将音频放大器设置为通电状态。 当音频放大器处于通电状态时,在功率放大器的输出级中流过的过电流和在功率放大器的输出信号线中出现的直流电压,并且如果需要,在电源中出现异常电压 并且当发生异常时,通过来自控制部的指令切断电力继电器,从而当异常发生时电源的初级侧被精确地切断。 根据本发明,由于当发生异常时电源的初级侧被精确地切断,即使电源发生异常,也可以防止电路元件和扬声器的损坏。
    • 58. 发明授权
    • Amplifier circuit with a stabilized bias in its output stage
    • 在其输出级具有稳定偏置的放大器电路
    • US5467058A
    • 1995-11-14
    • US296712
    • 1994-08-26
    • Shinichi Fujita
    • Shinichi Fujita
    • H03F1/34H03F1/30H03F3/30H03F3/26
    • H03F3/3076H03F1/307
    • An amplifier circuit with a stabilized bias in its output stage includes a push-pull type output-circuit having a first transistor and second transistor connected to each other in Darlington connection, a third transistor and a fourth transistor respectively operating complementarily with the first transistor and the second transistor. The third transistor and fourth transistor are connected to each other in Darlington connection, and the second transistor and fourth transistor are connected in series as output stage transistors between terminals of a DC power supply source. The amplifier circuit further includes a current detection circuit having current detection resistance inserted between either the first transistor or the third transistor and the DC power supply source and detecting idling current of either the first transistor or the third transistor by means of terminal voltage of the current detection resistance, and a biasing circuit responsive to output of the current detection circuit for controlling the idling current of either the first transistor or the third transistor in a negative feedback fashion.
    • 在其输出级中具有稳定偏置的放大器电路包括具有在达林顿连接中彼此连接的第一晶体管和第二晶体管的推挽型输出电路,分别与第一晶体管互补操作的第三晶体管和第四晶体管, 第二晶体管。 第三晶体管和第四晶体管在达林顿连接中彼此连接,第二晶体管和第四晶体管串联连接成直流电源的端子之间的输出级晶体管。 放大器电路还包括具有插入在第一晶体管或第三晶体管和直流电源之间的电流检测电阻的电流检测电路,并且借助于电流的端电压来检测第一晶体管或第三晶体管的空载电流 检测电阻以及响应于电流检测电路的输出的偏置电路,以负反馈的方式控制第一晶体管或第三晶体管的空载电流。