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1. 发明授权

US4199797A Protective circuit for amplifier circuits 失效
标题翻译：放大器电路保护电路
公开(公告)号：US4199797A
公开(公告)日：1980-04-22
申请号：US865868
申请日：1977-12-30
申请人： Jiro Kusumi
发明人： Jiro Kusumi
IPC分类号： C22B26/10 , B01D8/00 , H02H3/20 , H03F1/30 , H03F3/30 , H02H3/22
CPC分类号： H02H3/202 , H03F1/302 , H03F3/3088
摘要： A bias circuit including a resistor and a zener diode connected in series between a terminal to be connected to a power source and a ground becomes conductive when a voltage difference across the terminal and ground exceeds a predetermined value to make protective transistors conductive. Upon conduction of the protective transistors, transistors in an amplifier circuit become nonconductive.
摘要翻译：当端子和地之间的电压差超过预定值以使保护晶体管导通时，包括串联连接到电源的端子与地之间的电阻器和齐纳二极管的偏置电路变为导通。在保护晶体管导通时，放大器电路中的晶体管变得不导通。

2. 发明授权

US4152668A Protection circuit for amplifier circuits 失效
标题翻译：放大器电路保护电路
公开(公告)号：US4152668A
公开(公告)日：1979-05-01
申请号：US881068
申请日：1978-02-24
申请人： Jiro Kusumi
发明人： Jiro Kusumi
IPC分类号： H03F1/42 , H03F1/52 , H03F1/30
CPC分类号： H03F1/52
摘要： A protection circuit for amplifier circuits comprises first and second power source terminals, a first resistor connected at one end to the first power source terminal, a first Zener diode circuit including a plurality of first Zener diodes and connected between the first resistor and the second power source terminal, a second Zener diode connected between the first and second power source terminals, a series circuit including second and third resistors and connected across the second Zener diode, a transistor which is connected at the base to a junction between the second and third resistors and at the collector to the other terminal of the first resistor, and a second Zener diode circuit including a plurality of third Zener diodes and connected between the emitter of the transistor and the second power source terminal. The other end of the first resistor is connected through a signal interruption circuit to a power amplifier section. When voltage between first and second power source terminals or an operation temperature rises to exceed a predetermined value, the voltage drop produced across the first resistor energizes the signal interruption circuit to interrupt an input signal flow to the power amplifier section.
摘要翻译：用于放大器电路的保护电路包括第一和第二电源端子，一端连接到第一电源端子的第一电阻器，包括多个第一齐纳二极管并连接在第一电阻器和第二电源之间的第一齐纳二极管电路源极端子，连接在第一和第二电源端子之间的第二齐纳二极管，包括第二和第三电阻器并连接在第二齐纳二极管两端的串联电路，晶体管，其在基极连接到第二和第三电阻器并且在集电极处连接到第一电阻器的另一端，以及第二齐纳二极管电路，其包括多个第三齐纳二极管并且连接在晶体管的发射极和第二电源端子之间。第一电阻器的另一端通过信号中断电路连接到功率放大器部分。当第一和第二电源端子之间的电压或工作温度升高到超过预定值时，在第一电阻器两端产生的电压降给信号中断电路通电以中断输入到功率放大器部分的信号流。

3. 发明授权

US4112385A Sound amplifier circuit 失效
标题翻译：声音放大电路
公开(公告)号：US4112385A
公开(公告)日：1978-09-05
申请号：US785030
申请日：1977-04-06
申请人： Jiro Kusumi
发明人： Jiro Kusumi
IPC分类号： H03F1/00 , H03F3/183 , H03F3/20 , H03F3/30 , H03F3/26
CPC分类号： H03F3/183 , H03F3/3088
摘要： A series circuit comprising a detection transistor and detection resistor is connected in parallel with a decoupling capacitor connected to a signal input terminal of a class B push-pull amplifier. During a power supply OFF period the decoupling capacitor is discharged through the detection transistor and resistor and a drive transistor is turned ON by a voltage generated across the detection resistor, thereby preventing generation of a residual sound and pop sound.
摘要翻译：包括检测晶体管和检测电阻的串联电路与连接到B类推挽放大器的信号输入端的去耦电容并联连接。在电源OFF期间，去耦电容通过检测晶体管和电阻放电，驱动晶体管由检测电阻两端产生的电压导通，从而防止产生残留声音和流行音。

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