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1. 发明专利

JPH09167926A PROTECTION CIRCUIT FOR AMPLIFIER 失效
公开(公告)号：JPH09167926A
公开(公告)日：1997-06-24
申请号：JP32745995
申请日：1995-12-15
申请人： SANYO ELECTRIC CO
发明人： TAYA KOJI
IPC分类号： H03F3/68 , H03F1/52
摘要： PROBLEM TO BE SOLVED: To prevent fault from being erroneously detected by comparing an input signal to an amplifier circuit with an attenuated output signal from the amplifier circuit so as to detect the fault. SOLUTION: A signal generated from a signal source 27 is amplified by an input stage amplifier 18 and its output signal is given to a compactor circuit 23. An output signal from a 1st output stage amplifier 20 is attenuated by an attenuation circuit 22 and the attenuated signal is fed to the circuit 23. Then the circuit 23 compares both output signal levels and generates an output signal corresponding to the difference and the signal is given to a window comparator 24. A 1st and 2nd comparator sections 24a, 24b of the comparator 24 compares the signal with a 1st reference voltage and a 2nd reference voltage higher than the 1st reference voltage. When the output signal level of the circuit 23 is between the reference voltages, no signal is produced from the comparator 24, but the comparator 24 generates a signal when the output signal from the circuit 23 is at the outside of both the reference voltage, and the signal is given to a stop circuit 25, which provides an output of a stop signal and it stops a bias generating circuit 26 thereby stopping the operating of each amplifier. Thus, there is no phase delay between the output voltage and the output current so as to prevent the fault from being erroneously detected.

2. 发明专利

JPH10209776A POWER AMPLIFIER 失效
公开(公告)号：JPH10209776A
公开(公告)日：1998-08-07
申请号：JP974197
申请日：1997-01-22
申请人： SANYO ELECTRIC CO
发明人： USUI AKIRA , TAYA KOJI , KOKUBO KENICHI , TAIRA TAKAYUKI
IPC分类号： H03F3/68 , H03F1/02
摘要： PROBLEM TO BE SOLVED: To provide a power amplifier by which power consumption is reduced and a distortion factor of an output signal within a full output range is improved. SOLUTION: An input signal is amplified by a nonlinear amplifier circuit 10, from which positive and negative output half-wave signals, whose output DC voltage is set to a ground level, are produced. The positive output half wave signal is amplified by output amplifier circuits 11, 13 and the negative output half-wave signal is amplified by output amplifier circuits 12, 14. When the input signal is higher than a reference voltage Vref2, a load 8 is BTL-driven by the output amplifier circuits 11, 12 and a load 9 is BTL-driven by the output amplifier circuits 13, 14. When the input signal is lower than the Vref2, the loads 8, 9 are connected directly, and the loads 8, 9 are BTL-driven by the output amplifier circuits 11, 14 as asingle load.

3. 发明专利

JPH0846460A AMPLIFIER CIRCUIT 失效
公开(公告)号：JPH0846460A
公开(公告)日：1996-02-16
申请号：JP17426294
申请日：1994-07-26
申请人： SANYO ELECTRIC CO
发明人： TAYA KOJI
IPC分类号： H04R3/00 , H03F3/20 , H03F3/68 , H04S7/00
摘要： PURPOSE:To provide a highly efficient amplifier circuit which is capable of coping with plural loudspeakers. CONSTITUTION:This circuit is composed of amplifiers 14 and 15 amplifying left audio signals, amplifiers 16 and 17 amplifying right audio signals, volumes 12 and 13 for adjusting the input levels of the amplifiers 14 to 17, a first control circuit 19 generating control signals according to the output signals from the amplifiers 14 and 15, a second control circuit 21 generating control signals in accordance with the output signals from the amplifiers 16 and 17, and first and second switching regulators 18 and 20 for generating the power source valtage of the amplifiers 14 and 15 and the amplifiers 16 and 17 according to the control signals of the first and second control circuits 19 and 21 respectively.

4. 发明专利

JPH0818350A PROTECTIVE CIRCUIT FOR AMPLIFIER 失效
公开(公告)号：JPH0818350A
公开(公告)日：1996-01-19
申请号：JP14986694
申请日：1994-06-30
申请人： SANYO ELECTRIC CO
发明人： SHIRASE TATSUO , TAYA KOJI
IPC分类号： H03F3/68 , H03F1/52
摘要： PURPOSE:To prevent a break of audio sounds due to erroneous detection of fault caused by lightning strokes and line-to-ground fault. CONSTITUTION:One output signal of an output amplifier 21 is inverted by an inversion circuit 22. The other output signal of the output amplifier 21 and the output signal of the inversion circuit 22 are applied to transistors TRs 25 and 24 and are compared. The output signal of a comparison circuit 23 which is generated in accordance with the comparison result is applied to a window comparator 28 and is compared with first and second prescribed values determined by resistances 33 to 35. At the time of the occurrence of fault due to lightning strokes and ground fault, the output signal of the comparison circuit 23 is smaller than the first prescribed value and is larger than the second prescribed value, and therefore, the output signal of the window comparator 28 is applied to a stop circuit 12, and a bias current is not supplied to the output amplifier 21, and this amplifier 21 is not operated, and output TRs are protected from breakdown.

5. 发明专利

JPH0818349A PROTECTIVE CIRCUIT FOR AMPLIFIER AGAINST HEAT 失效
公开(公告)号：JPH0818349A
公开(公告)日：1996-01-19
申请号：JP14988294
申请日：1994-06-30
申请人： SANYO ELECTRIC CO
发明人： MATSUSHIMA HISASHI , TAYA KOJI
IPC分类号： H03F1/30 , H03F3/187
摘要： PURPOSE:To thermally protect an integrated circuit by reducing the operation of an output transistor TR without a sense of incompatibility on hearing like a break of sounds, etc. CONSTITUTION:The emitter voltage of a TR 2 generated in accordance with the cathode voltage of a Zener diode l is divided by resistances 26 and 27 and resistances 28 and 29 and is applied to bases of control TRs 5 and 6. When the chip temperature reaches a prescribed value, control TRs 5 and 6 are turned on, and the operation of output TRs 16 and 17 is slowly reduced in accordance with the temperature rise. When the chip temperature rises furthermore, TRs 30 and 31 are turned on by the middle point voltage between resistances 26 to 28 and the resistance 29, and the current flowing to the resistance 26 is reduced, and therefore, base voltages of control TRS 16 ana 6 quickly rise, ana the operation of output TRs 16 and 17 is quickly reduced.

6. 发明专利

JPH042209A LOAD CONNECTION STATE DETECTION CIRCUIT 失效
公开(公告)号：JPH042209A
公开(公告)日：1992-01-07
申请号：JP10333590
申请日：1990-04-19
申请人： SANYO ELECTRIC CO
发明人： KOAKUTSU HIROSHI , TAYA KOJI
IPC分类号： H03F3/20 , G01R31/00 , G01R31/02 , H03F3/68
摘要： PURPOSE:To detect the load connecting state with simple constitution by generating an output signal representing it that the load is not correctly connected when a difference of output currents from 1st and 2nd current detection circuits is a prescribed value or over. CONSTITUTION:The detection circuit is provided with a check mode setting circuit 29 generating a check mode signal for conducting check and an offset generating circuit 31 generating an offset voltage from an input stage amplifier section in response to the check mode signal. Moreover, a 1st current detection circuit 21 detecting a current flowing to a 1st load in response to the offset voltage and a 2nd current detection circuit 22 detecting a current flowing to a 2nd load in response to the offset voltage. Moreover, a current difference detection circuit 23 detecting whether or not a difference between output currents of the 1st and 2nd current detection circuits 21, 22 is within a prescribed range is provided. Thus, the connection state between an amplifier and a load is correctly detected.

7. 发明专利

JPH1098340A BTL AMPLIFYING CIRCUIT 失效
公开(公告)号：JPH1098340A
公开(公告)日：1998-04-14
申请号：JP25051196
申请日：1996-09-20
申请人： SANYO ELECTRIC CO
发明人： TAYA KOJI
IPC分类号： H03F3/68
摘要： PROBLEM TO BE SOLVED: To make the high output of a BTL amplifying circuit. SOLUTION: When first and fourth output transistors 15 and 18 are turned on, a voltage at the connecting point of first and second driving transistors 19 and 20 drops and when second and third output transistors 16 and 17 are turned on, a voltage at the connecting point of third and fourth driving transistors 21 and 22 drops. Thereby a voltage difference between the collectors and emitters between first and second input transistors 2 and 3 and first and second current source transistors 13 and 14 is extended to prevent the saturation of the first and second current source transistors 13 and 14. Thus, the saturation voltage of the BTL amplifier circuit is decided by the saturation voltage between the collector and the emitter of the first to fourth output transistors 15 to 18.

8. 发明专利

JPH0897639A GROUNDING PROTECTION CIRCUIT FOR AMPLIFIER 失效
公开(公告)号：JPH0897639A
公开(公告)日：1996-04-12
申请号：JP22970394
申请日：1994-09-26
申请人： SANYO ELECTRIC CO
发明人： TAYA KOJI
IPC分类号： H03F1/52 , H03F1/00
摘要： PURPOSE: To prevent an output transistor(TR) from being destroyed due to erroneous connection of a power supply. CONSTITUTION: When a power supply is erroneously connected to a power supply terminal 17 and an output terminal 16, parasitic TRs 29, 29' are produced to a 2nd TR 22 of a current mirror circuit 20 supplying a bias current from a bias current source to a drive TR 12. A positive feedback path is formed by the parasitic TRs 29, 29' and a bias current is increased. Furthermore, a parasitic TR 30 is produced also to a base terminal of a protection TR 25 and a collector current of the parasitic TR 30 is increased, resulting that the protection TR 25 is conductive by a voltage drop of a resistor 26. Then the increased bias current is bypassed by the protection TR 25 and not supplied to the drive TR 12 and the output TR 13 to prevent the drive and output TRs from being destroyed.

9. 发明专利

JPH04160898A OFFSET VOLTAGE GENERATING CIRCUIT 失效
公开(公告)号：JPH04160898A
公开(公告)日：1992-06-04
申请号：JP28748090
申请日：1990-10-24
申请人： SANYO ELECTRIC CO
发明人： KOAKUTSU HIROSHI , TAYA KOJI
IPC分类号： H04R3/00 , H03F3/20 , H03F3/213 , H03F3/34 , H03F3/347
摘要： PURPOSE:To simplify the circuit by utilizing an amplifier circuit to amplify an input signal so as to generate an offset voltage. CONSTITUTION:An input circuits turned on and an offset voltage generating section 7 is turned off in response to an output signal of a control circuit 12 in the case of the normal operation. Thus, an amplifier circuit 1 amplifies the input signal fed from the input circuit 4 and outputs the result to its output terminal. Moreover, in the case of the offset voltage generation, the offset voltage generating section 7 is activated and the input circuit 4 is inactivated in response to the output signal from the control circuit 12. Thus, the amplifier circuit 1 generates an output signal in response to the offset voltage generating section 7 to its output terminal. Thus, the circuit is simplified.

10. 发明专利

JP2000151297A ABNORMALITY DETECTING CIRCUIT OF POWER AMPLIFYING CIRCUIT 失效
公开(公告)号：JP2000151297A
公开(公告)日：2000-05-30
申请号：JP32383898
申请日：1998-11-13
申请人： SANYO ELECTRIC CO
发明人： TAYA KOJI , KOKUBO KENICHI , TAIRA TAKAYUKI
IPC分类号： H03F3/68 , H03F1/52
摘要： PROBLEM TO BE SOLVED: To prevent a speaker from breaking or burning owing to an input short, circuit of a power amplifying circuit. SOLUTION: Two BTL amplifiers 101 and 108 are provided with detection transistors which detect currents flowing to their output-stage transistors and an output current from one of detecting transistors 115 to 118 is compared with reference voltages Vr1 and Vr2 of a wind comparator 122 to detect an output offset.

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