[특허]Transistor protection circuit

Transistor protection circuit 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02H-007/20
출원번호	US-0638879 (1975-12-08)
발명자 / 주소	Davies Robert Bruce (Tempe AZ)
출원인 / 주소	Motorola, Inc. (Chicago IL 02)
인용정보	피인용 횟수 : 31 인용 특허 : 0

초록 ▼

The disclosed protection circuit which is suitable for providing protection of transistors included in integrated circuits such as regulators and power amplifiers, includes thermal shutdown, safe area and current control circuits. The current control portion includes a sense transistor connected substantially in parallel with the transistor to be protected. In monolithic integrated circuit applications, the sense transistor has an emitter area that is a predetermined ratio of the emitter area of the protected transistor. A “sense resistor”is connected to the sense transistor and develops a control signal which is proportional to the instantaneous current being conducted by the protected transistor. A threshold circuit is coupled between the sense resistor and the drive circuit for the protected transistor and responds to the magnitude of the control signal crossing a predetermined threshold to remove or reduce the drive to the protected transistor.

대표청구항 ▼

A protection circuit for a protected transistor having emitter, base and collector electrodes, said emitter electrode being coupled to an output terminal, the protection circuit including in combination: sense transistor means coupled to the protected transistor for providing a first control signal having a magnitude proportional to the magnitude of a signal conducted by the protected transistor, said sense transistor means having first, second and control electrodes; sense resistive means for providing a second control signal in response to said first control signal, said sense resistive means being coupled to said sense transistor means; first control transistor means for responding to said second control signal developed across said sense resistive means, said first control transistor means having first, control and second electrodes; first circuit means coupling said first control transistor means to said sense resistive means; second control transistor means for selectively shunting drive signals away from the protected transistor, said second control transistor means having first, control and second electrodes; second circuit means coupling said second control transistor means to said first control transistor means and to the protected transistor; and voltage limiting transistor having a control electrode coupled to said control electrode of said second control transistor means, a first electrode coupled to a reference voltage conductor and a second electrode coupled to the output terminal, said voltage limiting transistor means being rendered conductive in response to said second control transistor means being rendered conductive to cause the voltage at the output terminal to be limited to a predetermined maximum magnitude.

이 특허를 인용한 특허 (31)

Preis Josef (Munich DEX) Schwarz Ulf (Pullach DEX) Stolz Gerhard (Germering DEX), Circuit arrangement for limiting the switch-on current and for providing an over voltage protection in switch mode power.
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Szepesi Tamas S. (San Jose CA), Circuit for internal current limiting in a fast high side power switch.
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Barou Michel (Voreppe FRX), Device and a process for detecting current flow in a MOS transistor.
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Sauer ; Donald Roy, High efficiency power amplifier circuit.
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Fay Gary (Scottsdale AZ) Mansmann Jeffrey G. (Chandler AZ) Wellnitz Keith M. (Scottsdale AZ), Integrated circuit power timer.
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Atherton James H. (Freeport IL) Stanojevic Silvo (Freeport IL), Integrated circuit voltage regulator with transient protection.
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Mathews James K. (Van Nuys CA), Interface circuit for interconnecting an electronic controller to a resistance welding machine.
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Bynum Byron G. (Tempe AZ) Jarrett Robert B. (Tempe AZ), Method and circuit for providing adjustable control of short circuit current through a semiconductor device.
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Gavrila, Gabe C., Method and circuits for parallel sensing of current in a field effect transistor (FET).
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Johansson Jan H. (Blsta SEX), Multiple voltage regulator integrated circuit having control circuits for selectively disabling a voltage regulator in a.
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Paul H. Ouyang ; Joseph W. Ku ; Donald Liusie, Over-current protection circuit for linear voltage regulators.
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Dennis Malcolm Pryor GB; Michael Challis GB; Ian Paul Atkins GB, Overcurrent protection device.
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Rozenblit, Dmitriy; Domino, William J.; Damgaard, Morten, Power amplifier control driver having over-current protection and linear control.
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Amrani,Hafid; Cordonnier,Hubert; Dupuy,Christian, Power conversion device with efficient output current sensing.
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Colletti Paolo,ITX ; Bontempo Gregorio,ITX ; Pulvirenti Francesco,ITX ; Gariboldi Roberto,ITX, Protection circuit and method for power transistors, voltage regulator using the same.
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Kusumi Jiro (Yokohama JPX), Protection circuit for amplifier circuits.
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Gldner Walther (Denkendorf DEX) Kramer Horst (Kirchheim-Teck DEX), Protective circuit.
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Yip Douglas (Bellevue WA), Quasi-power measurement circuit.
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Riley Paul H. (Derby GB2), Rated temperature protection for turbine engine.
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Schmidt Thomas A. (Dallas TX) Teggatz Ross E. (McKinney TX) Devore Joseph A. (Dallas TX), Reducing the natural current limit in a power MOS device by reducing the gate-source voltage.
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Takano, Yoichi, Semiconductor device.
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Edwards Arthur J. (Hoffman Estates IL) Sievers Kirk (Roselle IL), Semiconductor device protection circuit.
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Marshall Andrew (Stevenage GBX) Colman Derek (Bromham GBX) Cavanagh Philip J. (Biddenham GBX) Dale David P. (Newport Pagnell GBX), Semiconductor switch.
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Hampshire Michael J. (Liversedge GB2), Switching circuit.
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Mendenhall,Eric, System and method for protecting an audio amplifier output stage power transistor.
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Marshall Andrew ; Lin Ching L. ; Xu Jingwei, System to control the output current with temperature through a controllable current limiting circuit.
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Hume Edward F. (Fort Worth TX) Hand Steven C. (Fort Worth TX), Thermally responsive power control for a radio transmitter.
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Bahlmann Johannes P. M. (Eindhoven NLX), Transistor protection circuit.
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Kotowski Thomas W. (Noblesville IN), Transistor protection circuit.
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Ranucci, Paul; Labicane, Robert, Versatile system for integrated sense transistor.
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Haas Frank J. (Harper Woods MI), Voltage regulator with current limiting circuitry.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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연합인증

Transistor protection circuit 원문보기

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이 특허를 인용한 특허 (31)

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Transistor protection circuit 원문보기

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이 특허를 인용한 특허 (31)

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