公开(公告)号：EP2722677A3

公开(公告)日：2015-09-23

申请号：EP13189569.0

申请日：2013-10-21

申请人： Keithley Instruments, Inc.

发明人： Goeke, Wayne

IPC分类号： G01R1/20 ,  G01R19/00 ,  H03F1/34

CPC分类号： G01R1/203 ,  G01R19/0023 ,  G01R19/0092 ,  H03F1/34 ,  H03F3/45475 ,  H03F2200/261 ,  H03F2203/45138

摘要： An active shunt ammeter for measuring current flowing through a device under test (DUT) and method are disclosed. The active shunt ammeter includes an input configured to receive an input signal having a frequency within a frequency band and representing the current flowing through the DUT. An output is configured to generate an output voltage representing the current flowing through the DUT. The active shunt ammeter also includes a gain circuit having an amplifier with a gain characteristic that varies respect to frequency within the frequency band and a feedback element having an impedance coupled from an output of the gain circuit to a negative input of the gain circuit, the feedback element impedance being configured to change with frequency to correlate with the amplifier gain characteristic such that the feedback element impedance divided by the amplifier gain over the frequency band has minimal frequency dependency.

公开(公告)号：EP2422490A1

公开(公告)日：2012-02-29

申请号：EP10723673.9

申请日：2010-04-14

申请人： PEUGEOT CITROËN AUTOMOBILES S.A.

发明人： MORAND, Nicolas

IPC分类号： H04L12/26 ,  H04L12/28 ,  H04L12/40 ,  H04L12/10 ,  G01R19/00

CPC分类号： H04L12/40032 ,  G01R19/0023 ,  G01R31/025 ,  H04L12/10 ,  H04L12/40 ,  H04L41/22

摘要： The invention relates to a device (D) that is dedicated to detecting operational defect(s) in at least one communication network (CN) having access to a bus (BU). Said device (D) includes: i) connection means (CM1) capable of being connected onto the bus (BU) with a bypass to access the voltages (V1, V2) therein; ii) detection means (DM) arranged to analyze said voltages (V1, V2) to deliver a first signal (S1) representative of the presence of data in the network (CN) and a second signal (S2) representative of the operating status of the network (CN); iii) processing means (MT1) arranged to output, from first (S1) and/or second (S2) signals and/or third signals (S3
11 -S3
22 ), each representative of a comparison result between one of the voltages (V1, V2) and at least one reference voltage, at least a fourth signal (S4
1 -S4
6 ) representative of a defect or of an absence of defects; and v) display means (DM1) arranged to signal each operational defect or absence of operational defects represented by a fourth output signal (S4
1 S4
6 ).

公开(公告)号：EP2002273A1

公开(公告)日：2008-12-17

申请号：EP07712718.1

申请日：2007-02-13

申请人： The University of Sussex

发明人： PRANCE, Robert ,  HARLAND, Christopher

IPC分类号： G01R29/12 ,  G01R19/00

CPC分类号： G01R19/0023 ,  A61B5/0408 ,  A61B5/0478 ,  G01R29/12

摘要： The present invention provides an electric potential sensor (28) for the measurement of potentials non-invasively. The sensor comprises at least one detection electrode (12) arranged for capacitive coupling with a sample under test and for generating a measurement signal, and a sensor amplifier (14) adapted to receive the measurement signal as input and to supply an amplified detection signal as output. Input impedance enhancing means (12a, 32, 36, 38, 44) are included for providing a high input impedance to the sensor amplifier for increasing the sensitivity of the electrode to reduced electric potentials, and a discrete pre-amplifier stage (30) is arranged to co-operate with the sensor amplifier to reduce the input capacitance of the amplifier.

公开(公告)号：EP1557679A3

公开(公告)日：2005-11-02

申请号：EP04257815.3

申请日：2004-12-15

申请人： Analog Devices, Inc.

发明人： Brokaw, Paul A.

IPC分类号： G01R19/00

CPC分类号： G01R19/0023 ,  G01R1/203 ,  G01R19/0092

摘要： A high side current monitor circuit includes an op amp which is coupled across a sensing element which carries a current I sense and develops a shunt voltage V sense . A feedback transistor driven by the op amp output conducts an output current I out through a resistor to a current output node necessary to make the op amp inputs equal, such that I out is proportional to I sense . I out is conducted through a resistor to generate a ground-referred voltage proportional to V sense . When the common mode voltage of V sense is greater than the op amp's breakdown voltage, a discrete transistor is connected between the current output node and ground to stand off the voltage across the amp. The monitor circuit is arranged such that it can be powered with a limited fraction of the common mode voltage when used with a discrete transistor, and is self-biased when used without a discrete transistor.

摘要翻译： 高边电流监视电路包括一个运算放大器，该运算放大器耦合在传感元件上，该传感元件承载一个电流Isense并产生一个分流电压Vsense。 由运算放大器输出驱动的反馈晶体管通过电阻将输出电流Iout导通到使运算放大器输入相等所必需的电流输出节点，使得Iout与Isense成正比。 Iout通过电阻器进行，以产生与Vsense成比例的接地参考电压。 当Vsense的共模电压大于运算放大器的击穿电压时，分立晶体管连接在电流输出节点和地之间，以抵消放大器两端的电压。 监视器电路被布置成当与分立晶体管一起使用时可以以共模电压的有限分数来供电，并且当不使用分立晶体管时，它们是自偏置的。

公开(公告)号：EP1557679A2

公开(公告)日：2005-07-27

申请号：EP04257815.3

申请日：2004-12-15

申请人： ANALOG DEVICES, INC.

发明人： Brokaw, Paul A.

IPC分类号： G01R19/00

CPC分类号： G01R19/0023 ,  G01R1/203 ,  G01R19/0092

摘要： A high side current monitor circuit includes an op amp which is coupled across a sensing element which carries a current I sense and develops a shunt voltage V sense . A feedback transistor driven by the op amp output conducts an output current I out through a resistor to a current output node necessary to make the op amp inputs equal, such that I out is proportional to I sense . I out is conducted through a resistor to generate a ground-referred voltage proportional to V sense . When the common mode voltage of V sense is greater than the op amp's breakdown voltage, a discrete transistor is connected between the current output node and ground to stand off the voltage across the amp. The monitor circuit is arranged such that it can be powered with a limited fraction of the common mode voltage when used with a discrete transistor, and is self-biased when used without a discrete transistor.

摘要翻译： 高边电流监视电路包括一个运算放大器，该运算放大器耦合在传感元件上，该传感元件承载一个电流Isense并产生一个分流电压Vsense。 由运算放大器输出驱动的反馈晶体管通过电阻将输出电流Iout导通到使运算放大器输入相等所必需的电流输出节点，使得Iout与Isense成正比。 Iout通过电阻器进行，以产生与Vsense成比例的接地参考电压。 当Vsense的共模电压大于运算放大器的击穿电压时，分立晶体管连接在电流输出节点和地之间，以抵消放大器两端的电压。 监视器电路被布置成当与分立晶体管一起使用时可以以共模电压的有限分数来供电，并且当不使用分立晶体管时，它们是自偏置的。

公开(公告)号：EP1219966A3

公开(公告)日：2003-10-22

申请号：EP01125927.2

申请日：2001-10-31

申请人： ABB PATENT GmbH

发明人： Keese, Dieter ,  Appel, Eggert Jun.

IPC分类号： G01R19/00 ,  G01F1/60

CPC分类号： G01R19/0023

摘要： Die Erfindung betrifft eine Einrichtung zur Messung kleiner hochohmiger Signale an Meßeinrichtungen, bei welcher das Meßsignal in einem Operationsverstärker verstärkt wird, gemäß Oberbegriff des Patentanspruches 1. Um hierbei die parasitären Kapazitäten innerhalb des Operationsverstärkers, auf jeden Operationsverstärker individuell anpaßbar zu kompensieren, ist erfindungsgemäß vorgeschlagen, daß eine gleichphasige Rückkopplung des Ausgangssignals des Operationsverstärkers (OP) über die parasitären Kapazitäten (Cp1,...,Cp6) des Operationsverstärkers (OP) auf dessen Eingang (E) mittels eines Potentiometers (P1) erfolgt.

公开(公告)号：EP0636892A3

公开(公告)日：1996-03-06

申请号：EP94305670.5

申请日：1994-07-29

申请人： XEROX CORPORATION

发明人： Werner Jr., Alan J.

IPC分类号： G01R29/24 ,  G01R15/04 ,  G01R29/12

CPC分类号： G01R1/30 ,  G01R15/165 ,  G01R19/0023 ,  G01R29/12

摘要： An electrostatic measurement apparatus for generating a modified electrical signal in proportion to an electrostatic potential present on a surface. The apparatus includes a sensor (200) for producing a signal representative of the electrostatic potential on the surface. The apparatus also includes a high-voltage level shifter (300) and a converter (400) to transform the sensor signal into a low-voltage signal indicative of the surface potential. The electrostatic measurement apparatus is implemented using high-voltage and low-voltage integrated circuit technology.

公开(公告)号：EP0636892A2

公开(公告)日：1995-02-01

申请号：EP94305670.5

申请日：1994-07-29

申请人： XEROX CORPORATION

发明人： Werner Jr., Alan J.

IPC分类号： G01R29/24 ,  G01R15/04 ,  G01R29/12

CPC分类号： G01R1/30 ,  G01R15/165 ,  G01R19/0023 ,  G01R29/12

摘要： An electrostatic measurement apparatus for generating a modified electrical signal in proportion to an electrostatic potential present on a surface. The apparatus includes a sensor (200) for producing a signal representative of the electrostatic potential on the surface. The apparatus also includes a high-voltage level shifter (300) and a converter (400) to transform the sensor signal into a low-voltage signal indicative of the surface potential. The electrostatic measurement apparatus is implemented using high-voltage and low-voltage integrated circuit technology.

摘要翻译： 一种静电测量装置，用于与存在于表面上的静电电位成比例地产生修改的电信号。 该装置包括用于产生表示表面上的静电电位的信号的传感器（200）。 该装置还包括高压电平移位器（300）和转换器（400），以将传感器信号转换成指示表面电位的低电压信号。 静电测量装置采用高压和低压集成电路技术实现。

公开(公告)号：EP0528658A1

公开(公告)日：1993-02-24

申请号：EP92307450.4

申请日：1992-08-14

申请人： SGS-THOMSON MICROELECTRONICS, INC.

发明人： Carobolante, Francesco

IPC分类号： G01R19/00 ,  H02K29/00 ,  H02P6/02

CPC分类号： G01R19/0023

摘要： A circuit for sensing the current delivered to a load, or multiple loads, such presented by a polyphase DC motor, without significantly dissipating the energy delivered to the load, has a predriver circuit (30,31,32) and a power delivery circuit (40,41,42) for each load. The predriver circuit is connected in a series path between a voltage source and a control element of the power delivery circuit, and the power delivery circuit is connected between a connection node and a respective one of the loads. A sensing element (49) is connected in a series path between the source of voltage and the power delivery circuit connection node. In a preferred embodiment, the sensing element is a resistor, the predriver circuit is a PNP transistor, and the power delivery circuit is an NPN transistor. The PNP and NPN transistors are connected to form a pseudo-Darlington transistor pair, with the collectors of the NPN transistors interconnected to enable a single sense resistor to be used to sense the current in each of the loads.

摘要翻译： 用于感测传送到负载的电流或由多相直流电动机呈现的多个负载而不显着耗散输送到负载的能量的电路具有预驱动电路（30,31,32）和电力输送电路（ 40,41,42）。 预驱动电路连接在电源和电力输送电路的控制元件之间的串联路径中，并且电力输送电路连接在连接节点和相应负载之间。 感测元件（49）连接在电压源和电力输送电路连接节点之间的串联路径中。 在优选实施例中，感测元件是电阻器，预驱动电路是PNP晶体管，功率输出电路是NPN晶体管。 PNP和NPN晶体管被连接以形成伪达林顿晶体管对，NPN晶体管的集电极被互连，使得能够使用单个检测电阻来感测每个负载中的电流。

公开(公告)号：EP0155197B1

公开(公告)日：1989-12-20

申请号：EP85400110.4

申请日：1985-01-23

申请人： COMMISSARIAT A L'ENERGIE ATOMIQUE ,  SOCIETE D'ETUDES INDUSTRIELLES DE VILLEJUIF, S.E.I.V.

发明人： Rabeyrolles, Serge

IPC分类号： G01R19/00

CPC分类号： G01R15/08 ,  G01R19/0023