WO2002052284A2 - Electrical quantity sensor - Google Patents
Electrical quantity sensor Download PDFInfo
- Publication number
- WO2002052284A2 WO2002052284A2 PCT/JP2001/011383 JP0111383W WO02052284A2 WO 2002052284 A2 WO2002052284 A2 WO 2002052284A2 JP 0111383 W JP0111383 W JP 0111383W WO 02052284 A2 WO02052284 A2 WO 02052284A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- current
- signal
- light
- voltage
- electrical quantity
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/144—Measuring arrangements for voltage not covered by other subgroups of G01R15/14
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/203—Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts
-
- 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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- 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
- G01R19/32—Compensating for temperature change
Definitions
- the present invention relates to an electrical quantity sensor.
- An electric current sensor using a hall element such as that shown in Fig. 4 has hitherto been provided as an electrical quantity sensor of this type.
- a hall element 12 produces a voltage corresponding to the magnetic flux.
- the voltage output from the hall element 12 is amplified by an amplifier 13, and the thus-amplified voltage is output to the outside.
- the electric current sensor set forth detects the value of a current flowing through the current path 20 on the basis of a magnetic flux developing in the core 11 in accordance with the electric current flowing through the path 20. If a heavy current flows into the current path 20 to make the magnetic flux developing in the core 11 saturated, the current flowing through the current path 20 cannot be detected accurately.
- a current sensor based on the above-described current sensor.
- the sensor is provided with a current amplification circuit 14 which further amplifies the output from the amplifier 13 and outputs the thus-amplified output as a current signal.
- the electric current is output from the current amplification circuit 14 via a compensating winding 15 coiled around the core 11.
- the compensating winding 15 is coiled in the direction in which the magnetic flux developing in the core 11 is neutralized.
- the current signal is output via the compensating winding
- the compensating winding 15 is coiled in the direction in which the magnetic flux developing in the core 11 is neutralized, occurrence of magnetic saturation of the core 11 can be prevented, thus improving the accuracy of detection of the current sensor.
- the measurement accuracy of the current sensor greatly depends on the performance of the hall element 12.
- the measurement accuracy of the current sensor is greatly affected by variations in performance of the hall element 12 or the temperature characteristic of the hall element 12. The reason for this is that the temperature characteristic of the hall element is changed by package stress exerted on a balance element.
- the magnetic flux developing in the core 11 is neutralized by the magnetic flux that appears in the compensating winding 15 as a result of the current output from the current amplification circuit 14, thereby preventing magnetic saturation of the core 11.
- the core 11 must be wound around the compensating winding 15, thus adding to costs.
- the current output from the current amplification circuit 14 must be made large, thereby resulting in an increase in current consumption.
- the present invention has been conceived in light of the foregoing problem and aims at providing a low-cost, low- current-consumption current sensor which has achieved a reduction in variations in measurement accuracy.
- the present invention provides an electrical quantity sensor comprising: an oscillation circuit for producing a clock signal of predetermined frequency; a light- emitting element which blinks at a predetermined frequency in accordance with the clock signal output from the oscillation circuit; a switching element which is optically coupled to the light-emitting element and is brought into conduction when the light-emitting element illuminates; a transformer whose primary winding is connected, by way of the switching element, to input terminals which receive a d.c. electric signal; and a synchronization detecting circuit which synchronously detects an a.c. electric signal developing in a secondary winding of the transformer while the clock signal is taken as a reference, thereby producing a d.c. voltage signal corresponding to the amplitude of the d.c. electric signal.
- the switching element When the light-emitting element blinks at a predetermined frequency corresponding to the clock signal output from the oscillation circuit, the switching element is turned on and off in accordance with blinking action of the light-emitting element.
- a d.c. electric signal is converted into an a.c. electric signal by means of switching action of the switching element.
- the thus-converted a.c. electric signal is transmitted to the secondary side of circuitry.
- An a.c. electric signal developing in the secondary winding of the transformer is synchronously detected by means of a synchronization detecting circuit while a clock signal is taken as a reference.
- the d.c. electrical signal corresponding to the amplitude of the d.c. electric signal can be obtained. In this way, the d.c.
- a circuit under detection is electrically insulated from a detection circuit by means of a light-emitting element and a switching element, which are optically coupled together, and a transformer. Hence, the influence to be exerted on the circuit under detection can be diminished.
- the electrical quantity sensor according to the present invention produces a d. c . voltage signal corresponding to the amplitude of a d.c. electric signal.
- the circuit of the electrical quantity sensor is constituted of an oscillation circuit, a switching element, an IC such as a synchronization detecting circuit, and a light- emitting element. Hence, there can be provided an electrical quantity sensor involving low current consumption.
- the d.c. electric signal is a voltage across a detection resistor inserted into an electrical path through which an electric current to be detected flows.
- a current sensor which detects a d.c. electrical current .
- the d.c. electric signal is a d.c. voltage signal.
- a voltage sensor which detects a value of d.c. voltage.
- the switching element is a MOSFET.
- an electrical quantity sensor for detecting the electrical quantity of a circuit through which an electric current flows in both directions.
- Fig. 1 is a circuit diagram of an electric current sensor according to an embodiment of the present invention
- Fig. 2 is a circuit diagram of an electric current sensor according to another embodiment of the present invention.
- Fig. 3 (a) is a substitute circuit diagram of a primary windings of the transformer of the present invention.
- Fig. 3 (b) is another substitute circuit diagram for the primary windings of the transformer of the present invention.
- Fig. 4 is a circuit diagram of a conventional related-art electric current sensor
- Fig.5 is a circuit diagram of another conventional electric current sensor.
- Fig.1 shows a circuit diagram of the current sensor.
- the current sensor 1 comprises a detection resistor 2 connected in series with a current path 20; an oscillation circuit 5 which produces a clock signal SI of predetermined frequency; a light-emitting diode (light-emitting element) 3a whose anode receives a given applied voltage and whose cathode is connected to an output terminal of the oscillation circuit 5; a photocoupler-like light transmission element 3 constituted of a phototransistor (switching element) optically connected to the light-emitting diode 3a, and an electrically insulated phototransistor (switching element) 3b; a transformer 4 whose primary winding 4a is connected across the detection resistor 2 via the phototransistor 3b; and a synchronization detecting circuit 6 which synchronously detects a voltage signal developing in a secondary
- the oscillation circuit 5 produces the clock signal SI of predetermined frequency.
- An electric current intermittently flows into the light-emitting diode 3a of the light transmission element 3 by means of the clock signal SI, whereby the light- emitting diode 3a blinks and the phototransistor 3b is turned on/off at a predetermined frequency.
- a d.c. current I to be detected flows into the current path 20
- a voltage proportional to a current value of the electric current I to be detected appears across the detection resistor 2.
- the voltage is switched by the phototransistor 4b, and as a result an a.c. current flows into the primary winding 4a of the transformer 4.
- the synchronization detecting circuit 6 synchronously detects and demodulates the voltage signal S2 while the clock signal SI is taken as a reference, whereby a d.c. voltage signal S3 proportional to the voltage across the detection resistor 2 is output .
- the current sensor 1 electrically isolates the current path 20 from the detection circuit 6 by use of the light transmission element 3 and the transformer 4. Hence, the influence to be exerted on the current path 20 can be diminished. Even when a microcurrent is measured, a current I to be detected flowing through the current path 20 can be detected accurately.
- the voltage across the detection resistor 2 is converted into an a.c. signal by means of being switched by the clock signal SI of the oscillation circuit 5.
- the voltage signal S2 input by way of the transformer 4 is synchronously detected while the clock signal SI is taken as a reference. Thus, the voltage signal is restored to the d.c. voltage signal S3.
- the present current sensor does not use a hall element having great variations.
- the performance of the current sensor does not greatly depend on only the performance of a hall element.
- the current sensor 1 outputs a d.c. voltage signal S3
- the circuit of the current sensor 1 is constituted of substantially an IC and an LED.
- the current sensor 1 involves low current consumption.
- the current sensor 1 may be provided with an amplifier 7a placed before the synchronization detecting circuit 6 and an amplifier 7b placed behind the same.
- the magnitude of the voltage signal S3 may be adjusted by means of changing the amplifying factor of the amplifier 7a and that of the amplifier 7b.
- a low-pass filter (LPF) 8 is provided behind the synchronization detecting circuit 6, thereby obviating an unwanted signal component.
- the current sensor shown in Fig.2 is provided with the amplifier 7a provided before the synchronization detecting circuit 6 and the amplifier 7b provided after the same; however, it may be the case that an amplifier is provided only before or only behind the synchronization detecting circuit 6.
- the detection resistor 2 is connected in series with the current path 20, thereby detecting the magnitude of a current which is to be detected and flows through the current path 20.
- a circuit configuration constituted by means of connecting, in series and across input terminals for a voltage to be detected, the detection resistor 2, the phototransistor 4b, and the primary winding 4a of the transformer 4.
- the current sensor 1 of the combination consisting of the detection resistor 2, the phototransistor 3b connected across the detection resistor 2, and the primary winding 4a of the transformer 4 connected via the phototransistor 3b, there may be adopted a circuit configuration constituted by means of connecting, in series and across input terminals for a voltage to be detected, a resistor 9a and a resistor 9b, and connecting the resistor 9b in parallel with the phototransistor 3b connected in series with the primary winding 4a of the transformer 4.
- the current sensor 1 according to the embodiment can be employed as a voltage sensor for detecting a value of the voltage across the input terminals.
- the current sensor 1 employs the photocoupler-like light transmission element 3 which is optically coupled to the light-emitting diode (light-emitting) element 3a, and the phototransistor (switching element) 3b which is optically connected to the light-emitting diode 3a and electrically insulated.
- a light transmission element such as a photo-MOS relay which is optically coupled to the light-emitting diode 4a and has an electrically-insulated MOSFET is used as a substitute for the phototransistor 3b, thereby enabling detection of the electrical quantity of a circuit in which current flows in both directions.
- the present invention could equip photodiode, phototransistor, photothyristor, phototriac or the like as the switching element. In these elements, If the current could flow in both directions, it is possible to subject the current detection as same as MOSFET.
- an electrical quantity sensor comprising: an oscillation circuit for producing a clock signal of predetermined frequency; a light-emitting element which blinks at a predetermined frequency in accordance with the clock signal output from the oscillation circuit; a switching element which is optically coupled to the light-emitting element and is brought into conduction when the light-emitting element illuminates; a transformer whose primary winding is connected, by way of the switching element, to input terminals which receive a d.c. electrical signal; and a synchronization detecting circuit which synchronously detects an a.c.
- a circuit under detection is electrically insulated from a detection circuit by means of a light-emitting element and a switching element, which are optically coupled together, and a transformer. Hence, the influence to be exerted on the circuit under detection can be diminished.
- the electrical quantity sensor according to the present invention produces a d.c.
- the circuit of the electrical quantity sensor is constituted of an oscillation circuit, a switching element, an IC such as a synchronization detecting circuit, and a light-emitting element. Hence, there can be provided an electrical quantity sensor involving low current consumption.
- the d.c. electric signal is a voltage across a detection resistor inserted into an electrical path through which an electric current to be detected flows.
- a current sensor which detects a d.c. electrical current .
- the d.c. electric signal is a d.c. voltage signal.
- a voltage sensor which detects a value of d.c. voltage.
- the switching element is a MOSFET.
- an electrical quantity sensor for detecting the electrical quantity of a circuit through which an electric current flows in both directions.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01271803A EP1348133B1 (en) | 2000-12-25 | 2001-12-25 | Electrical quantity sensor |
US10/129,123 US6707287B2 (en) | 2000-12-25 | 2001-12-25 | Electrical quantity sensor |
DE60138479T DE60138479D1 (en) | 2000-12-25 | 2001-12-25 | SENSOR FOR ELECTRIC SIZE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-393696 | 2000-12-25 | ||
JP2000393696A JP4269515B2 (en) | 2000-12-25 | 2000-12-25 | Electric quantity detection sensor |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002052284A2 true WO2002052284A2 (en) | 2002-07-04 |
WO2002052284A3 WO2002052284A3 (en) | 2002-12-05 |
Family
ID=18859443
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/011383 WO2002052284A2 (en) | 2000-12-25 | 2001-12-25 | Electrical quantity sensor |
Country Status (7)
Country | Link |
---|---|
US (1) | US6707287B2 (en) |
EP (1) | EP1348133B1 (en) |
JP (1) | JP4269515B2 (en) |
KR (1) | KR20030009322A (en) |
CN (1) | CN1180268C (en) |
DE (1) | DE60138479D1 (en) |
WO (1) | WO2002052284A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104578749A (en) * | 2014-12-31 | 2015-04-29 | 无锡华润矽科微电子有限公司 | Stroboflash-free active power factor correcting circuit applied to LED drive |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3966186B2 (en) * | 2003-02-17 | 2007-08-29 | 松下電工株式会社 | Electric quantity detection sensor |
US20060192549A1 (en) * | 2005-02-25 | 2006-08-31 | Sandquist David A | Current sensor with magnetic toroid dual frequency detection scheme |
DE102005015942A1 (en) * | 2005-04-07 | 2006-10-12 | Abb Patent Gmbh | Device for supplying power to measuring sensors and transmitting a synchronous clock signal to them |
JP4566964B2 (en) * | 2006-09-06 | 2010-10-20 | 日立ビークルエナジー株式会社 | Total battery voltage detector |
FR2910162B1 (en) * | 2006-12-18 | 2009-12-11 | Schneider Electric Ind Sas | ELECTRICALLY INSULATED MEASURING SIGNAL COUPLING DEVICE AND ELECTRICAL APPARATUS COMPRISING SUCH A DEVICE |
FR2910173B1 (en) * | 2006-12-18 | 2012-05-04 | Schneider Electric Ind Sas | ELECTRIC ISOLATION CURRENT MEASURING DEVICE, ELECTRONIC TRIGGER, AND CIRCUIT BREAKER COMPRISING SUCH A DEVICE |
CN101162242B (en) * | 2006-12-29 | 2010-05-12 | 长春工程学院 | Method for testing direct current by quadrature transformer |
JP4770827B2 (en) * | 2007-11-27 | 2011-09-14 | パナソニック電工株式会社 | Electric quantity detection sensor |
JP4915590B2 (en) * | 2007-11-27 | 2012-04-11 | パナソニック株式会社 | Electric quantity detection sensor |
US8754630B2 (en) * | 2009-05-08 | 2014-06-17 | Lanids+Gyr, Inc. | Apparatus and method for measuring real time clock accuracy in an electric meter |
FR2945633A1 (en) * | 2009-05-18 | 2010-11-19 | Schneider Electric Ind Sas | SENSOR WITH FLAT INTERFACE AND ADAPTED CONNECTION |
US8929053B2 (en) * | 2010-09-13 | 2015-01-06 | William Henry Morong | Direct-current current transformer |
US8836525B2 (en) | 2011-06-06 | 2014-09-16 | Lear Corporation | Isolated resistive current sensor |
DE102013207529A1 (en) * | 2013-04-25 | 2014-10-30 | Robert Bosch Gmbh | Method for determining a current intensity of a current flowing into or out of a rechargeable battery connected to a power supply via at least one switch |
CN104820126B (en) * | 2015-05-20 | 2017-12-15 | 中国一冶集团有限公司 | Detection and the method and apparatus for suppressing control loop relay induced voltage failure |
JPWO2019159582A1 (en) * | 2018-02-15 | 2020-10-22 | パナソニックIpマネジメント株式会社 | Arc detection circuit, breaker, power conditioner, solar panel, module attached to solar panel, junction box |
CN109541291B (en) * | 2018-11-30 | 2021-10-08 | 重庆嘉陵华光光电科技有限公司 | Wide-temperature high-precision multi-path current acquisition system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993023915A1 (en) * | 1992-05-21 | 1993-11-25 | Nokia Telecommunications Oy | Voltage measuring circuit |
EP0845678A2 (en) * | 1996-11-28 | 1998-06-03 | Alcatel | Voltage insulated voltage and/or current measuring circuit |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2611635B2 (en) * | 1993-10-08 | 1997-05-21 | 日本電気株式会社 | DC current measuring instrument |
US5757628A (en) * | 1996-01-31 | 1998-05-26 | Tohoku Ricoh Co., Ltd. | Stabilized high frequency switching power supply with suppressed EMI noise |
US6495932B1 (en) * | 1997-09-26 | 2002-12-17 | Hitachi Koki Co., Ltd. | DC power source unit |
JP4355058B2 (en) * | 1999-07-27 | 2009-10-28 | 日本信号株式会社 | Power supply |
-
2000
- 2000-12-25 JP JP2000393696A patent/JP4269515B2/en not_active Expired - Fee Related
-
2001
- 2001-12-25 WO PCT/JP2001/011383 patent/WO2002052284A2/en not_active Application Discontinuation
- 2001-12-25 DE DE60138479T patent/DE60138479D1/en not_active Expired - Lifetime
- 2001-12-25 US US10/129,123 patent/US6707287B2/en not_active Expired - Lifetime
- 2001-12-25 EP EP01271803A patent/EP1348133B1/en not_active Expired - Lifetime
- 2001-12-25 CN CNB018027725A patent/CN1180268C/en not_active Expired - Fee Related
- 2001-12-25 KR KR1020027006226A patent/KR20030009322A/en not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993023915A1 (en) * | 1992-05-21 | 1993-11-25 | Nokia Telecommunications Oy | Voltage measuring circuit |
EP0845678A2 (en) * | 1996-11-28 | 1998-06-03 | Alcatel | Voltage insulated voltage and/or current measuring circuit |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 07, 31 August 1995 (1995-08-31) -& JP 07 110347 A (NEC CORP), 25 April 1995 (1995-04-25) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104578749A (en) * | 2014-12-31 | 2015-04-29 | 无锡华润矽科微电子有限公司 | Stroboflash-free active power factor correcting circuit applied to LED drive |
CN104578749B (en) * | 2014-12-31 | 2017-04-05 | 无锡华润矽科微电子有限公司 | It is a kind of be applied to LED driving without stroboscopic passive power factor corrective circuit |
Also Published As
Publication number | Publication date |
---|---|
WO2002052284A3 (en) | 2002-12-05 |
CN1180268C (en) | 2004-12-15 |
CN1408066A (en) | 2003-04-02 |
DE60138479D1 (en) | 2009-06-04 |
US6707287B2 (en) | 2004-03-16 |
EP1348133B1 (en) | 2009-04-22 |
JP4269515B2 (en) | 2009-05-27 |
EP1348133A2 (en) | 2003-10-01 |
JP2002196020A (en) | 2002-07-10 |
US20030076086A1 (en) | 2003-04-24 |
KR20030009322A (en) | 2003-01-29 |
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