公开(公告)号：AU535704B2

公开(公告)日：1984-04-05

申请号：AU5857880

申请日：1980-05-20

Applicant: SONY CORP

Inventor： YOSHIDA TADAO

IPC: H03F3/20 ,  H03F3/217 ,  H03F3/387 ,  H03F3/38 ,  H03K7/08 ,  H03K9/08

Abstract: A pulse width modulated signal amplifier includes a first DC voltage source having first and second terminals, first and second switching transistors each having a control electrode, the main current path of which is connected in series between the first and second terminals of the first DC voltage source, the connection point of which is connected to an output terminal, a signal input circuit for supplying a pulse width modulated signal to the control electrodes of the first and second switching transistors, a low pass filter having an input connected to the output terminal and an output to be connected to a load, a second DC voltage source having first and second terminals, the output voltages of which are lower than those of the first and second terminals of the first DC voltage source, a first circuit including a first diode and connected between the first terminal of the second DC voltage source and the output terminal, and a second circuit including a second diode connected between the second terminal of the second DC voltage source and the output terminal, thereby to reduce amplitude distortion in the output voltage of the output terminal.

公开(公告)号：AU530130B2

公开(公告)日：1983-07-07

申请号：AU4724079

申请日：1979-05-21

Applicant: SONY CORP

Inventor： SUZUKI TADAO ,  YOSHIDA TADAO

IPC: H03F1/30 ,  H03F1/32 ,  H03F3/20 ,  H03F3/217 ,  H03K7/08 ,  H03F1/34

Abstract: A PWM (pulse width modulated) signal power amplifier includes an input terminal supplied with a PWM signal directly, an integrator, a zero-cross switch and a pulse amplifier. A negative feedback circuit is provided between the input of the integrator and the output of the pulse signal amplifier so as to provide a low distortion in spite of the voltage fluctuations in the operating voltage to the pulse amplifier.

公开(公告)号：CA1130873A

公开(公告)日：1982-08-31

申请号：CA321513

申请日：1979-02-14

Applicant: SONY CORP

Inventor： YOSHIDA TADAO

IPC: H03K3/01 ,  H03K17/60

Abstract: A pulse signal amplifier is disclosed which includes at least an emitter follower type drive stage consisting of a pair of complementary transistors and a field effect transistor connected to the drive stage and ON/OFF controlled thereby. A capacitive element is connected between the collectors of the complementary transistors and a pulse current signal source is provided to supply a charge current to the capacitive element and a drive current to the complementary transistors.

公开(公告)号：AU522539B2

公开(公告)日：1982-06-10

申请号：AU4379279

申请日：1979-01-31

Applicant: SONY CORP

Inventor： YOSHIDA TADAO

IPC: H03F3/217 ,  H03K5/02 ,  H03K17/567 ,  H03K17/66

公开(公告)号：CA1111518A

公开(公告)日：1981-10-27

申请号：CA291941

申请日：1977-11-29

Applicant: SONY CORP

Inventor： SUZUKI TADAO ,  YOSHIDA TADAO

IPC: H03F1/00 ,  H03F1/42 ,  H03F1/52 ,  H03F3/20 ,  H03F3/217 ,  H03F3/04

Abstract: PULSE WIDTH MODULATED SIGNAL AMPLIFIER A pulse width modulated signal amplifier comprises a DC power supply for rectifying an AC input voltage to produce a pair of DC voltages of opposite polarity, a pulse width modulated signal amplifying circuit supplied with a pulse width modulated signal to produce a demodulated signal through a low pass filter , and a detecting circuit responsive to an abnormal level of the DC voltages to produce a detecting signal when a smoothing condenser of the DC power supply is overcharged by a current flowing through the low pass filter in one direction. Such detecting signal is desirably employed to prevent the appearance of the output signal from the pulse width modulated amplifying circuit.

公开(公告)号：FR2462819A1

公开(公告)日：1981-02-13

申请号：FR8016269

申请日：1980-07-23

Applicant: SONY CORP

Inventor： SUZUKI TADAO ,  YOSHIDA TADAO

IPC: H03G3/02 ,  H03G1/02 ,  H03G3/00 ,  H03G5/04 ,  H03G3/20

公开(公告)号：CA1090890A

公开(公告)日：1980-12-02

申请号：CA311839

申请日：1978-09-21

Applicant: SONY CORP

Inventor： YOSHIDA TADAO

IPC: H02H7/20 ,  H03F3/04

Abstract: An overload detecting circuit for a PWM amplifier includes an output current detecting circuit and an output voltage detecting circuit. The output of the output voltage detecting circuit is supplied to a rectifying circuit having a discharge time constant determined by the cut-off frequency of a low pass filter as a demodulator of the PWM amplifier. A comparison circuit is provided to produce an overload indicative signal in response to the comparison result between the outputs of the rectifying circuit and of the output current detecting circuit.

公开(公告)号：DE3017958A1

公开(公告)日：1980-11-20

申请号：DE3017958

申请日：1980-05-10

Applicant: SONY CORP

Inventor： YOSHIDA TADAO

IPC: H02M7/5375 ,  H02M7/538 ,  H02P13/18

公开(公告)号：CA1089543A

公开(公告)日：1980-11-11

申请号：CA290449

申请日：1977-11-08

Applicant: SONY CORP

Inventor： YOSHIDA TADAO ,  SUZUKI TADAO

IPC: H03F3/20 ,  H03F3/217 ,  H03F3/30 ,  H03F3/34 ,  H03F3/345 ,  H03K5/02 ,  H03F3/16 ,  H03F3/26 ,  H03K17/60

Abstract: PUSH-PULL PULSE AMPLIFIER HAVING IMPROVED TURN-ON AND TURN-OFF TIMES A pulse amplifier formed of first and second field effect transistors, each exhibiting an inherent input capacitance at its gate electrode, the field effect transistors being connected in push-pull relation whereby their drain or source electrodes are connected to a common output terminal. First and second resistive circuits are connected in a pulse supply circuit to supply pulse signals to the respective gate electrodes of the field effect transistors. Each of the resistive circuits exhibits a higher resistance when a pulse is supplied therethrough to turn the respective field effect transistor ON and a lower resistance when the pulse is terminated to turn the respective field effect transistor OFF. The higher resistance of the resistive circuit cooperates with the inherent input capacitance of the respective field effect transistor to provide a higher discharge time constant to turn that field effect transistor ON and the lower resistance cooperates with the inherent input capacitance of the field effect transistor to provide a lower charge time constant to turn that field effect transistor OFF, whereby the field effect transistors are not ON concurrently. In a preferred embodiment, the field effect transistors are complementary field effect transistors so that a positive-going pulse turns one of those field effect transistors OFF while turning the other ON, and a negative-going pulse turns the one field effect transistor ON while turning the other OFF. -i-

公开(公告)号：CA1058702A

公开(公告)日：1979-07-17

申请号：CA253969

申请日：1976-06-03

Applicant: SONY CORP

Inventor： SUZUKI TADAO ,  YOSHIDA TADAO ,  WACHI SHIGEAKI

IPC: H02M3/338 ,  H02M7/5383 ,  H02M7/5387 ,  H02M7/537 ,  H02M1/08 ,  H02P13/18

Abstract: A transistor inverter includes a pair of switching transistors each having base, emitter and collector electrodes, each of the collector and emitter circuits of which is connected between a DC voltage source through a primary winding of an output transformer, respectively, the secondary winding of which is connected to a rectifying circuit so as to produce a DC output voltage at its output. The transistor inverter also includes an input transformer with a saturable core and voltage feedback and current feedback circuits. The current feedback circuit has another transformer which controls the amount of current feedback, and the winding ratio of the primary and secondary windings is determined in connection with the current amplification factor of said first and second switching transistors in order to improve a switching speed of the switching transistors.