WO2010052278A1 - Circuit de mesure du courant efficace d'un signal à contrôler - Google Patents
Circuit de mesure du courant efficace d'un signal à contrôler Download PDFInfo
- Publication number
- WO2010052278A1 WO2010052278A1 PCT/EP2009/064705 EP2009064705W WO2010052278A1 WO 2010052278 A1 WO2010052278 A1 WO 2010052278A1 EP 2009064705 W EP2009064705 W EP 2009064705W WO 2010052278 A1 WO2010052278 A1 WO 2010052278A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- circuit
- current
- effective current
- reference signal
- Prior art date
Links
- 238000000034 method Methods 0.000 claims description 12
- 230000000737 periodic effect Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/02—Measuring effective values, i.e. root-mean-square values
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06G—ANALOGUE COMPUTERS
- G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
- G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
Definitions
- the present invention relates to a circuit for measuring the effective current of a signal to be tested, in particular in the field of current control of electrical machines with variable inductance such as the actuators used for so-called electromagnetic valves ("camless" system). English) in motor vehicles.
- the invention relates to any equipment requiring one or more simultaneous measurements of a true effective quantity, in particular an effective current, for monitoring, diagnosis or close protection, with respect to equipment in which there is no There are no numerical resources or computing powers available or sufficient to process the measurement, and in which it is not desired to introduce expensive analog components such as analog multipliers or other specific integrated circuits that are not widely available.
- the invention is particularly interesting for a reliable diagnosis of an overload, in particular for an optimized solenoid valve system which one wishes to exploit the maximum of possibilities without exceeding the limits of operation.
- the equipment supplying a load with strong current must be supervised in particular to ensure the safety of the people and the material, to optimize the consumption of the loads, to detect a possible anomaly of these loads (overload) and / or to adapt the thresholds of protection in function of external and / or variable parameters such as temperature, starting mode or a particular configuration of the equipment.
- the ratio between a mean average measurement and an effective measurement Ufficac ⁇ is the square root of the duty cycle, the latter being defined as the ratio between the duration t1 of the signal over its period T. .
- neither the peak value nor the average value can represent heating of the actuator, the power cables or any other component conducting the current.
- this method can not be improved by a correction factor as proposed by the patent US5027060 "MEASURING DEVOTION OF THE RMS VALUE OF A SIGNAL, NOTABLY FOR CURRENT MEASUREMENT IN A SOLID-STATE TRIP DEVICE".
- the measurement of the rms current can be obtained by digital calculations based on analog-digital acquisitions which require a bandwidth and a sampling frequency large enough not to excessively filter the processed signals.
- the square measure of the rms value does not provide good sensitivity over a large scale of value, the relative error and the resolution of the measures varying inversely squared.
- the value of the rms current can be found by controlling the rise in temperature of a resistance traversed by a direct current stabilized to that of a resistance traversed by an image current. measured current.
- the current disjunction solutions generally used are fuses and electro-magneto-thermal circuit breakers.
- the present invention aims at providing a circuit for measuring the effective current of a signal to be controlled having a low cost and a satisfactory reliability for an application such as the control of the supply current of electromagnetic valves of an engine. automobile.
- the invention proposes a circuit for measuring the effective current of a signal to be controlled, characterized in that it comprises means for controlling a continuous reference signal to the signal to be monitored so that the effective current of the signal continuous reference is equal to the effective current of the signal to be monitored.
- a circuit according to the invention can be implemented by means of low cost components, such as standard operational amplifiers. It does not require analog multipliers or specific integrated circuits. - Its use implements a continuous signal whose voltage or intensity are easily measurable.
- a circuit according to the invention may also have one or more of the following characteristics, considered individually or in any technically possible combination:
- the circuit comprises a first modulator and a second modulator respectively processing the signal to be controlled or the reference signal to provide a first modulated signal or a second modulated signal whose average current is proportional, respectively, to the square of the current. effective signal to be measured or squared the effective current of the reference signal.
- the circuit comprises means for modulating the first modulated signal and the second modulated pulse width and amplitude signal using a periodic signal.
- the first modulator comprises means for the pulse width modulation to correspond to a duty cycle proportional to the intensity of the current to be controlled.
- the circuit comprises means for modulating the signal to be monitored and the continuous reference signal with a switching frequency such that, over a period T of calculating the average value of the first modulated signal or the second modulated signal, this mean value is proportional to the square of the effective current of the signal to be measured or the reference signal.
- each modulator comprises an operational amplifier receiving, at a first input, a signal to be modulated and, at a second input, the periodic signal.
- the circuit comprises:
- a block performing the comparison between the effective currents of the modulated signals via their respective average values, and a block injecting the result of this comparison into the circuit, via a feedback loop, as being the continuous reference signal.
- the invention also relates to a method for measuring the effective current of a signal to be tested, characterized in that a continuous reference signal is slaved to the signal to be monitored so that the effective current of the continuous reference signal is equal to the current effective signal to control by means of a circuit according to one of the previous achievements.
- FIG. 1 already described, illustrates a drive current
- FIG. 2 represents a comparator circuit implemented for modulating a signal according to one embodiment of the invention
- FIG. 3 represents a doubly modulated pulse width and amplitude signal according to one embodiment of the invention
- FIG. 4 is a block diagram of a measuring circuit according to one embodiment of the invention
- FIG. 5 represents operational amplifier and comparator circuits
- FIG. 6 is an electrical diagram making it possible to perform the functions described in FIG. 4;
- a circuit for measuring the effective current of a signal to be controlled i (t) comprises means for controlling a continuous reference signal i D c (t) to this signal i (t) to be controlled so that the effective current i D ceff (t) of this reference signal i D c (t) is equal to the effective current i ⁇ ff (t) of the signal to be controlled.
- a circuit in accordance with the invention can implement a dual modulation function applied to both the signal i (t) to be controlled and to the reference signal i D c (t).
- This double modulation similar for the two signals, is described below vis-à-vis the signal i (t) to control. It comprises in particular: a first modulation in pulse width such that the duty cycle (t), that is to say the width of a pulse at time t, of the modulated signal u (t) is proportional to the intensity of the current to be measured i (t) according to the formula:
- a second amplitude modulation such that the amplitude of the modulated signal u (t) is proportional to the intensity of the current to be measured i (t).
- this double modulation of pulse width and amplitude can be achieved by means of a modulator 11 (FIG. 2) comprising an operational amplifier 10.
- the signal i (t) to be monitored is provided at the input V + (12) of the operational amplifier 10 while a periodic signal, typically sawtooth, is provided at the input V- (14) of the same operational amplifier 10.
- a resistance 16 of recall imposes the voltage of the signal i (t) when the voltage at the terminal V + (12) is greater than the voltage at the terminal V- (14) of the amplifier 10. If necessary, this voltage is zero.
- FIG. 3 represents, as a function of the time-axis of the abscissae 17, the intensity of this signal u (t) - ordinate axis 18.
- this average value U (T) can be written as follows:
- the average value U (T) of this signal u (t) resulting from the double modulation of the signal i (t) to be controlled can be compared with the average value U D c (T) of the signal u D c ( t) derived from the double modulation of the continuous reference signal i D c (t).
- a circuit 22 in accordance with the invention thus comprises a servo-control loop - powered by the output signal of a comparator 24 - respective average values U (T) and U DC (T). signals u (t), modulated from the current to be measured i (t), and u D c (t), modulated from the reference current i D c (t).
- this output signal is the continuous reference signal i D c (t) transmitted to the input of the modulator 19 whose operation is similar to the operation of the modulator 1 1 already described.
- the circuit 22 may be in the form of an operational amplifier circuit illustrated in FIG. 5. More specifically, an operational amplifier 30 can perform the function of the comparator 24 by receiving, at its input 32, the signal u (t) modulated from the current to be measured and, at its input 34, the signal u D c (t) modulated from the reference current.
- the loop 20 is implemented in the form of an operational amplifier integrator circuit 36 which integrates the measured difference and feeds it back into the circuit as a continuous reference signal.
- a circuit according to the invention comprises in this embodiment four operational blocks, namely:
- FIG. 6 represents the circuit diagram of a circuit according to the invention. It should be noted that the components used - operational amplifier, comparator and resistors - have a low cost and satisfactory reliability for the implementation of the invention. It will also be noted that the invention has been more particularly described in the case of using amplifiers making it possible to perform the functions described. However, other types of elements, in particular with transistors, can also be used without departing from the scope of the invention. Finally, any means can be replaced by equivalent means.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Software Systems (AREA)
- Computer Hardware Design (AREA)
- Measurement Of Current Or Voltage (AREA)
- Control Of Voltage And Current In General (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2011122617/28A RU2011122617A (ru) | 2008-11-06 | 2009-11-05 | Схема измерения эффективного тока контролируемого сигнала |
CN2009801442177A CN102209900A (zh) | 2008-11-06 | 2009-11-05 | 用于测量被监视的信号的有效电流的电路 |
MX2011004712A MX2011004712A (es) | 2008-11-06 | 2009-11-05 | Circuito para medir la corriente eficiente de una señal que se va a monitorear. |
EP09756701A EP2356474A1 (fr) | 2008-11-06 | 2009-11-05 | Circuit de mesure du courant efficace d'un signal à contrôler |
US13/127,327 US8581573B2 (en) | 2008-11-06 | 2009-11-05 | Circuit for measuring the effective current of a signal to be monitored |
JP2011535109A JP2012507732A (ja) | 2008-11-06 | 2009-11-05 | 監視信号の実効電流測定回路 |
BRPI0921677A BRPI0921677A2 (pt) | 2008-11-06 | 2009-11-05 | circuito de medida da corrente eficaz de um sinal a controlar e processo de medida da corrente eficaz de um sinal a controlar |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0806210A FR2938070B1 (fr) | 2008-11-06 | 2008-11-06 | Circuit de mesure du courant efficace d'un signal a controler |
FR0806210 | 2008-11-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010052278A1 true WO2010052278A1 (fr) | 2010-05-14 |
Family
ID=40886488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2009/064705 WO2010052278A1 (fr) | 2008-11-06 | 2009-11-05 | Circuit de mesure du courant efficace d'un signal à contrôler |
Country Status (11)
Country | Link |
---|---|
US (1) | US8581573B2 (fr) |
EP (1) | EP2356474A1 (fr) |
JP (1) | JP2012507732A (fr) |
KR (1) | KR20110088541A (fr) |
CN (1) | CN102209900A (fr) |
BR (1) | BRPI0921677A2 (fr) |
FR (1) | FR2938070B1 (fr) |
MX (1) | MX2011004712A (fr) |
MY (1) | MY152821A (fr) |
RU (1) | RU2011122617A (fr) |
WO (1) | WO2010052278A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8952742B2 (en) * | 2012-10-31 | 2015-02-10 | Marvell World Trade Ltd. | Highly accurate true RMS power detector for cellular applications |
KR101433757B1 (ko) * | 2013-02-04 | 2014-08-27 | 동아전장주식회사 | 엔진 냉각팬 모터 제어기의 부하 전류 측정 오차 보상 방법 |
KR20140100855A (ko) * | 2013-02-07 | 2014-08-18 | 에스케이하이닉스 주식회사 | 주기신호생성회로 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3150006A1 (de) * | 1981-12-17 | 1983-06-23 | Brown, Boveri & Cie Ag, 6800 Mannheim | Schaltungsanordnung zur effektivwertmessung |
US6204719B1 (en) * | 1999-02-04 | 2001-03-20 | Analog Devices, Inc. | RMS-to-DC converter with balanced multi-tanh triplet squaring cells |
US6359576B1 (en) * | 1999-10-01 | 2002-03-19 | Linear Technology Corporation | Apparatus and methods for performing RMS-to-DC conversion with bipolar input signal range |
US6429720B1 (en) * | 2000-05-12 | 2002-08-06 | Analog Devices, Inc. | RMS-DC converter using a variable gain amplifier to drive a squaring cell |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3624525A (en) * | 1969-11-20 | 1971-11-30 | Hewlett Packard Co | True rms converter |
GB1425966A (en) * | 1973-06-29 | 1976-02-25 | Solartron Electronic Group | True rms converter |
JPH073799Y2 (ja) * | 1988-09-21 | 1995-01-30 | 富士通電装株式会社 | 電力制御装置 |
FR2650395B1 (fr) * | 1989-07-31 | 1991-09-27 | Merlin Gerin | Dispositif de mesure de la valeur efficace d'un signal, notamment pour la mesure du courant dans un declencheur statique |
JP3209807B2 (ja) * | 1992-10-15 | 2001-09-17 | 株式会社日立製作所 | 実効値検出装置 |
US5450268A (en) | 1993-08-11 | 1995-09-12 | Square D Company | Method and apparatus for RMS current approximation |
US6172549B1 (en) * | 1999-02-24 | 2001-01-09 | Analog Devices, Inc. | Low supply current RMS-to-DC converter |
GB2364401B (en) * | 2000-07-06 | 2004-07-14 | Turbo Genset Company Ltd The | Distributed control method |
US7187160B2 (en) * | 2005-07-26 | 2007-03-06 | Higgins James C | Systems and methods for measuring an RMS voltage |
-
2008
- 2008-11-06 FR FR0806210A patent/FR2938070B1/fr not_active Expired - Fee Related
-
2009
- 2009-11-05 US US13/127,327 patent/US8581573B2/en not_active Expired - Fee Related
- 2009-11-05 CN CN2009801442177A patent/CN102209900A/zh active Pending
- 2009-11-05 EP EP09756701A patent/EP2356474A1/fr not_active Withdrawn
- 2009-11-05 RU RU2011122617/28A patent/RU2011122617A/ru not_active Application Discontinuation
- 2009-11-05 JP JP2011535109A patent/JP2012507732A/ja active Pending
- 2009-11-05 BR BRPI0921677A patent/BRPI0921677A2/pt not_active IP Right Cessation
- 2009-11-05 MX MX2011004712A patent/MX2011004712A/es active IP Right Grant
- 2009-11-05 WO PCT/EP2009/064705 patent/WO2010052278A1/fr active Application Filing
- 2009-11-05 MY MYPI20111853 patent/MY152821A/en unknown
- 2009-11-05 KR KR1020117012576A patent/KR20110088541A/ko not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3150006A1 (de) * | 1981-12-17 | 1983-06-23 | Brown, Boveri & Cie Ag, 6800 Mannheim | Schaltungsanordnung zur effektivwertmessung |
US6204719B1 (en) * | 1999-02-04 | 2001-03-20 | Analog Devices, Inc. | RMS-to-DC converter with balanced multi-tanh triplet squaring cells |
US6359576B1 (en) * | 1999-10-01 | 2002-03-19 | Linear Technology Corporation | Apparatus and methods for performing RMS-to-DC conversion with bipolar input signal range |
US6429720B1 (en) * | 2000-05-12 | 2002-08-06 | Analog Devices, Inc. | RMS-DC converter using a variable gain amplifier to drive a squaring cell |
Also Published As
Publication number | Publication date |
---|---|
MX2011004712A (es) | 2011-08-24 |
JP2012507732A (ja) | 2012-03-29 |
BRPI0921677A2 (pt) | 2016-02-16 |
MY152821A (en) | 2014-11-28 |
US20110234205A1 (en) | 2011-09-29 |
KR20110088541A (ko) | 2011-08-03 |
FR2938070A1 (fr) | 2010-05-07 |
RU2011122617A (ru) | 2012-12-20 |
FR2938070B1 (fr) | 2012-03-23 |
EP2356474A1 (fr) | 2011-08-17 |
CN102209900A (zh) | 2011-10-05 |
US8581573B2 (en) | 2013-11-12 |
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