WO2016125638A1 - 電流センサ - Google Patents
電流センサ Download PDFInfo
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- WO2016125638A1 WO2016125638A1 PCT/JP2016/052223 JP2016052223W WO2016125638A1 WO 2016125638 A1 WO2016125638 A1 WO 2016125638A1 JP 2016052223 W JP2016052223 W JP 2016052223W WO 2016125638 A1 WO2016125638 A1 WO 2016125638A1
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- current
- current sensor
- calibration
- inverter
- inverter circuit
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- 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
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- 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
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
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- 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—Measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
Definitions
- the present invention relates to a current sensor.
- the current sensor has setting data that links the magnitude of the current and the detection signal in a predetermined correspondence relationship.
- the current sensor outputs a detection signal corresponding to the magnitude of the detected current based on the setting data.
- the current sensor may not be able to maintain the output of a predetermined detection signal corresponding to the magnitude of the detected current due to various causes such as environmental changes. Therefore, the current sensor is calibrated to correct the setting data.
- the calibration is generally performed by causing a current sensor to detect a direct current as described in Patent Document 1.
- the current sensor may detect an alternating current instead of a direct current. At this time, if an alternating current is detected with setting data corrected based on calibration using a direct current, there is a problem that an error occurs between the current value interpreted from the detection signal and the true value of the alternating current. .
- a current sensor includes a current detection unit that detects an alternating current flowing through a conductor, and a storage unit that stores correction data based on a detection value obtained by detecting a predetermined calibration alternating current flowing through the conductor by the current detection unit. And.
- an error generated between the current value interpreted from the detection signal and the true value of the alternating current can be reduced.
- the figure which showed a mode that the current sensor was mounted in the inverter (arrow view of FIG. 1).
- FIG. 1 and 2 show an example in which the current sensor 8 of the present embodiment is mounted on an inverter device.
- FIG. 2 is an arrow view when FIG. 1 is viewed from the arrow YA1.
- the bus bar 7 is made of a conductor such as copper.
- the bus bar 7 is a part of the inverter main circuit, and a current output from a power module or the like flows therethrough.
- a current flows through the bus bar 7
- a magnetic flux is generated with the bus bar 7 as a central axis.
- the current sensor 8 detects a magnetic flux generated by the current flowing through the bus bar 7 and outputs a detection signal to the inverter circuit board 9.
- the inverter circuit board 9 is an inverter control board, and performs feedback control using the detection signal received from the current sensor 8.
- the current sensor 8 includes a current sensor circuit 1, a current sensor substrate 2, a communication terminal 3, a peripheral electronic component 4, a magnetic shield 5, and a structural mold 6.
- the communication terminal 3 is a terminal for electrically connecting the current sensor circuit 1 and the inverter circuit board 9.
- the communication terminal 3 transmits the signal of the current sensor circuit 1 to the inverter circuit board 9.
- the communication terminal 3 transmits a signal from the inverter circuit board 9 side to the current sensor circuit 1. Details of transmitting a signal from the inverter circuit board 9 side to the current sensor circuit 1 will be described later. Note that the communication terminal 3 also transmits power for operating the current sensor circuit 1.
- the current sensor circuit 1 detects a magnetic flux generated by the current flowing through the bus bar 7 and outputs a detection signal to the inverter circuit board 9 via the communication terminal 3. Details of the current sensor circuit 1 will be described later.
- the peripheral electronic component 4 is a peripheral RC chip component mounted on the current sensor substrate 2.
- the current sensor substrate 2 is a substrate on which the current sensor circuit 1, the communication terminal 3, and the peripheral electronic component 4 are mounted.
- the current sensor substrate 2 is fixed to the bus bar 7 with a structural mold 6 so that the current sensor circuit 1 is located a predetermined distance away from the bus bar 7.
- the magnetic shield 5 is provided to reduce the influence of magnetic noise. As shown in FIG. 2, the magnetic shield 5 surrounds the bus bar 7 and the current sensor substrate 2 and has a square U-shape.
- the structural mold 6 is a structural mold that structurally holds a part of the current sensor substrate 2, the magnetic shield 5, and the bus bar 7.
- FIG. 3 is a diagram showing the current sensor circuit 1 and its peripheral configuration.
- the current sensor circuit 1 includes a magnetic flux detection unit 11, a signal adjustment unit 12, a control unit 13, a communication unit 14, and a memory 15.
- the control unit 13 controls operations of other components of the current sensor circuit 1.
- the memory 15 is a memory in which data can be rewritten, and is composed of, for example, an EEPROM.
- the memory 15 stores setting data having offset data and output gain data.
- the setting data stored in the memory 15 is appropriately output to the signal adjustment unit 12 by the control unit 13. Further, the setting data stored in the memory 15 is corrected by the control unit 13 at the time of calibration of setting data, which will be described later.
- the magnetic flux detection unit 11 detects the current flowing through the bus bar 7. Specifically, the magnetic flux detection unit 11 includes a Hall element, and detects the current flowing through the bus bar 7 by detecting the magnetic flux generated by the current flowing through the bus bar 7 using the Hall element. Then, a voltage signal corresponding to the detected current magnitude is output to the signal adjustment unit 12.
- the signal adjustment unit 12 generates a detection signal based on the current detection result by the magnetic flux detection unit 11 and the setting data stored in the memory 15. Specifically, the signal adjustment unit 12 detects the voltage signal received from the magnetic flux detection unit 11 by performing offset adjustment and gain adjustment based on the setting data stored in the memory 15 and output from the control unit 13. Generate a signal.
- the signal adjustment unit 12 is designed to lose the stored setting data every time the power supply is interrupted. Therefore, the signal adjustment unit 12 receives setting data from the control unit 13 every time the current sensor circuit 1 is activated.
- the communication unit 14 outputs the detection signal obtained from the signal adjustment unit 12 to the inverter circuit board 9 (see FIG. 1) via the communication terminal 3.
- the communication unit 14 receives correction data for correcting the setting data from the outside via the communication terminal 3 when the setting data stored in the memory 15 is calibrated. That is, the communication terminal 3 is used for the communication unit 14 to output a detection signal and receive correction data.
- FIG. 4 shows the distribution of the magnetic flux density B generated in the bus bar 7 when a current is passed through the bus bar 7.
- FIG. 4A shows a case where a direct current is passed
- FIG. 4B shows a case where an alternating current is passed.
- a direct current is passed
- the current density in the bus bar 7 is uniformly distributed, so that the magnetic flux density B is also uniformly distributed as shown in FIG.
- an alternating current is applied, the current concentrates on the corners of the bus bar 7 due to the skin effect, so that the magnetic flux density B also concentrates on the corners of the bus bar 7 as shown in FIG.
- FIG. 5 shows the result of current flowing under the conditions shown in FIG. 4, and shows the magnetic flux density with respect to the distance along the thickness direction of the bus bar 7 from the center position CEN of the bus bar 7 shown in FIG. (See FIG. 4).
- the graph shown by the solid line in FIG. 5 is based on the direct current shown in FIG.
- the graph shown by the broken line in FIG. 5 is based on the alternating current (frequency: 10000 Hz) shown in FIG. As shown in FIG. 5, it is understood that the difference in magnetic flux density between AC and DC is closer to the center position CEN.
- the difference corresponding to the magnetic flux density of about 3 mT is a detected value of the alternating current as compared with the case where the direct current is detected. Will occur. Since such a difference occurs, it is not desirable to detect the alternating current by calibrating with the direct current. That is, when an alternating current is detected, the calibration must also be performed with the alternating current flowing.
- FIG. 6 shows the calibration in the present embodiment.
- the calibration device 20 has a configuration excluding at least the current sensor 8 (product sensor) that is the object to be calibrated. That is, the calibration device 20 includes a current sensor calibration unit 25, an alternating current generation unit 24, a bus bar 22, and a reference current sensor 29.
- the current sensor calibration unit 25 includes a current sensor output comparison unit 26, a current sensor communication unit 27, and a switch 21.
- the reference current sensor 29 is a reference current sensor that can detect the current flowing through the bus bar 22 with high accuracy.
- the bus bar 22 is formed of a conductor such as copper. Both ends of the bus bar 22 are connected to the alternating current generator 24.
- the reference current sensor 29 and the current sensor 8 detect an alternating current (calibration alternating current described later) flowing through the bus bar 22 and output a detection signal to the current sensor output comparison unit 26.
- the alternating current generation unit 24 is a single-phase alternating current generation source, and mainly includes a voltage adjustment unit (not shown) and a transformer unit (not shown).
- the alternating current generation unit 24 communicates with the current sensor output comparison unit 26, receives an instruction from the current sensor output comparison unit 26, and outputs an alternating current to the bus bar 22. This AC current will be called a calibration AC current.
- the current sensor output comparison unit 26 issues a command to output an alternating current for calibration to the alternating current generation unit 24 at the time of output gain adjustment described later.
- the current sensor output comparison unit 26 compares the output of the reference current sensor 29 and the output of the current sensor 8, and outputs a difference between these output voltages to the current sensor communication unit 27.
- the current sensor communication unit 27 generates correction data for correcting the setting data stored in the memory 15 of the current sensor 8 based on the difference between the output voltages, and outputs the correction data to the current sensor 8.
- the current sensor 8 corrects the setting data included in the memory 15 using the correction data.
- the switch 21 switches the connection destination of the current sensor 8 between the current sensor output comparison unit 26 and the current sensor communication unit 27.
- FIG. 7 is a flowchart for the calibration of this embodiment.
- the flowchart includes an offset voltage adjustment process including steps S02 to S05 and an output gain adjustment process including steps S06 to S09.
- product sensor in FIG. 7 refers to the current sensor 8
- reference sensor refers to the reference current sensor 29.
- step S02 When the calibration flow is started (step S01), the process enters step S02.
- step S02 no current flows through the bus bar 22.
- the current sensor output comparison unit 26 measures the offset voltages of the current sensor 8 and the reference current sensor 29.
- step S03 the current sensor output comparison unit 26 calculates an offset voltage error by subtracting the offset voltage of the reference current sensor 29 from the offset voltage of the current sensor 8.
- the current sensor output comparison unit 26 transmits offset correction data having an offset voltage error to the current sensor communication unit 27.
- step S04 is entered.
- step S04 the current sensor communication unit 27 outputs the offset correction data to the current sensor 8.
- the control unit 13 corrects the offset data of the setting data included in the memory 15 using the offset correction data. Specifically, the offset voltage error is added to the offset data of the setting data.
- the process enters step S05.
- the current sensor output comparison unit 26 measures the offset voltages of the current sensor 8 and the reference current sensor 29 in a state where the bus bar 22 is not energized, as in step S02. Then, the current sensor output comparison unit 26 confirms whether or not the voltage value of the offset voltage of the current sensor 8 is within the target output range.
- the current sensor output comparison unit 26 determines whether or not the difference when the offset voltage of the reference current sensor 29 is subtracted from the offset voltage of the current sensor 8 is equal to or less than a predetermined value. If a positive determination is made, the process enters step S06. If a negative determination is made, step S02 is entered, and the same flow is followed thereafter. If a negative determination is made at a predetermined number of times, for example, 5 times in step S05, the current sensor 8 is regarded as a product defect.
- step S ⁇ b> 06 the alternating current generator 24 causes the calibration alternating current to flow through the bus bar 22 in response to a command from the current sensor output comparator 26.
- the frequency of the alternating current for calibration is the frequency when the current sensor 8 is actually used, that is, the frequency of the alternating current to be measured. Further, for the reason described later (see FIG. 9), the amplitude of the alternating current for calibration is set to the amplitude of the maximum current that flows through the bus bar 22 when the current sensor 8 is actually used.
- the current sensor output comparison unit 26 measures the output voltage waveform output from each of the current sensor 8 and the reference current sensor 29. After step S06, the process enters step S07.
- step S07 the current sensor output comparison unit 26 calculates an output gain error from the voltage waveform of the current sensor 8 and the voltage waveform of the reference current sensor 29.
- the current sensor output comparison unit 26 transmits output gain correction data having an output gain error to the current sensor communication unit 27.
- step S08 the current sensor communication unit 27 outputs the output gain correction data to the current sensor 8.
- the control unit 13 corrects the output gain data of the setting data included in the memory 15 using the output gain correction data. Specifically, the output gain error is added to the output gain data of the setting data.
- step S09 the process enters step S09.
- step S09 the current sensor output comparison unit 26 measures the output voltage waveforms of the current sensor 8 and the reference current sensor 29 in a state where the calibration alternating current is supplied to the bus bar 22, as in step S06. Then, the current sensor output comparison unit 26 confirms whether the voltage amplified by the output gain of the current sensor 8 is within the target output range. That is, the current sensor output comparison unit 26 determines whether the difference between the amplitude of the output voltage waveform of the current sensor 8 and the amplitude of the output voltage waveform of the reference current sensor 29 is equal to or less than a predetermined value. If a positive determination is made, step S10 is entered and the flow is terminated. If a negative determination is made, step S06 is entered, and the same flow is followed thereafter. If a negative determination is made at a predetermined number of times, for example, 5 times in step S09, the current sensor 8 is determined to be defective.
- the setting data after correction based on the detection value obtained by detecting the predetermined calibration AC current by the magnetic flux detection unit 11 is stored in the memory 15.
- the detection result of the alternating current by the magnetic flux detecting unit 11 is adjusted by the signal adjusting unit 12 so that no detection error occurs when the current sensor 8 detects the alternating current. be able to.
- FIG. 8 shows an example of the relationship between the input current and output voltage of the current sensor 8 when calibrated with a direct current.
- the current When calibrating with a direct current, the current must flow until the current is stable and the measurement is complete. Therefore, the maximum current value (700A in FIG. 8) may not be calibrated because of the product damage caused by the bus bar generating heat.
- the broken line L1 may actually be calibrated as indicated by the solid line L2.
- calibration is often performed at two points of 0 A (first adjustment point) and the positive current value (second adjustment point) that can be calibrated, and the minus side is often not calibrated. .
- FIG. 9 shows an example of the relationship between the input current and output voltage of the current sensor 8 when calibration is performed in the present embodiment.
- calibration is performed with an alternating current having a maximum amplitude of 700 A that may actually be used.
- the frequency of the alternating current is set to a frequency that is actually used.
- calibration can be performed in the current range of ⁇ 700 A to +700 A that is actually used. That is, the voltage output from the current sensor 8 can be made error-free in all current regions actually used.
- the current sensor of the present embodiment has the following configuration and exhibits the following operational effects.
- the current sensor 8 detects a magnetic flux generated by an alternating current flowing through the bus bars 7 and 22 that are conductors, thereby detecting a magnetic flux detection unit 11 that detects the alternating current and a predetermined calibration alternating current flowing through the bus bar 22.
- a memory 15 that stores setting data based on the detection value detected by the magnetic flux detection unit 11. As a result, it is possible to prevent a detection error from occurring when the current sensor 8 detects an alternating current.
- the frequency of the alternating current for calibration is determined based on the frequency of the alternating current to be measured. Thereby, it is possible to prevent an error from occurring when the current sensor 8 detects an alternating current to be measured.
- the communication terminal 3 is further provided for outputting a detection signal and receiving correction data relating to setting data. This eliminates the need to unnecessarily increase the number of communication terminals, thereby contributing to space saving.
- the current sensor substrate 2 provided with the magnetic flux detector 11 and the memory 15 is further provided, and the communication terminal 3 is provided on the current sensor substrate 2.
- the magnetic flux detection unit 11, the memory 15, and the communication terminal 3 can be combined on the current sensor substrate 2.
- FIG. 10A shows the current detection unit 30.
- the current detection unit 30 includes a current sensor 8 provided on the bus bar 7, and the current sensor 8 detects a current flowing through the bus bar 7.
- the current detection unit 30 constitutes a current detection module 31 as shown in FIG.
- the current detection module 31 includes a number of current detection units 30 corresponding to the number of phases of the alternating current used.
- FIG. 10B shows a current detection module 31 for a three-phase alternating current. Since the current detection module 31 shown in FIG. 10B is for flowing a three-phase alternating current, it has three current detection units 30. For the following description, the three current detection units 30 shown in FIG. 10B will be re-assigned as 30U, 30V, and 30W.
- bus bars included in the current detection units 30U, 30V, and 30W are re-assigned as bus bars 7U, 7V, and 7W, respectively.
- the current sensors included in the current detection units 30U, 30V, and 30W are re-referenced as current sensors 8U, 8V, and 8W.
- FIG. 10B shows how a three-phase alternating current flows through the current detection module 31.
- the U-phase, V-phase, and W-phase AC currents flow through the bus bars 7U, 7V, and 7W of the current detection units 30U, 30V, and 30W, respectively. That is, the phases of the alternating currents flowing through the respective current detection units 30 are different from each other.
- a current sensor of a certain current detection unit 30 detects even a magnetic flux generated by a current flowing in a current detection unit 30 other than the current detection unit 30. Occur. This will be specifically described.
- the solid lines 801a, 801b, and 801c shown in FIG. 11 are voltage waveforms output from the current detection module 31 shown in FIG.
- the current detection units 30U, 30V, and 30W of the current detection module 31 should output the voltage waveforms indicated by the broken lines 802a, 802b, and 802c, respectively, but solid lines 801a and 801b are caused by interference with each other. , 801c are output. Therefore, when the current detection module 31 is configured using three calibrated single-phase AC currents for one current detection unit 30 and the three-phase AC current is detected, an error is caused by the difference between the solid line and the broken line. End up. Therefore, in this embodiment, three current sensors 8 are used to calibrate with a three-phase alternating current.
- FIG. 12 is a diagram illustrating calibration according to the present embodiment.
- the calibration according to the present embodiment will be described with reference to FIG. In addition, description is abbreviate
- calibration is performed using a three-phase alternating current. This is the main difference from the calibration of the first embodiment (FIG. 6).
- the calibration device 120 has a configuration excluding at least the current sensors 8U, 8V, and 8W (product sensors) to be calibrated. That is, the calibration device 120 includes a current sensor calibration unit 125, an alternating current generation unit 124, a bus bar 122, and reference current sensors 129U, 129V, and 129W.
- the current sensor calibration unit 125 includes a current sensor output comparison unit adapted to three-phase alternating current detection, a current sensor communication unit, and a switch.
- the bus bar 122 includes bus bars 122U, 122V, and 122W. One ends of the bus bars 122U, 122V, 122W are connected to each other at a point 122P, and the other ends are connected to the alternating current generator 124, respectively.
- the bus bars 122U, 122V, and 122W are provided with reference current sensors 129U, 129V, and 129W, and current sensors 8U, 8V, and 8W to be calibrated, respectively.
- the calibration flowchart of the present embodiment is different from the three-phase or single-phase, but is otherwise the same as the calibration flowchart (FIG. 7) of the first embodiment, and the description thereof is omitted.
- the error caused by the interference due to the alternating current of the other phase can be corrected, and the output of the current sensor 8 does not include the error.
- the present embodiment as in the first embodiment, it is possible to prevent an error (see FIG. 5) due to the skin effect from occurring. Moreover, it can also calibrate in the whole electric current range to be used (refer FIG. 9).
- the current sensor of the present embodiment has the following configuration and exhibits the following operational effects in addition to the operational effects of the first embodiment.
- the magnetic flux detection unit 11 detects the three-phase alternating current flowing through the three bus bars by detecting the magnetic flux generated by the three-phase alternating current flowing through the three bus bars.
- the calibration AC current is also a three-phase AC current according to the object to be measured, and each phase current flows through each of the three bus bars. As a result, an error caused by interference due to an alternating current of another phase can be corrected, and the error is not included in the output of the current sensor 8.
- FIG. 13 shows a power conversion device 50 (inverter device 50) including the current sensor 8.
- the current sensor 8 is provided in a current detection module 31 for detecting a three-phase alternating current as shown in FIG. Since the current detection module 31 is provided in the power conversion device 50, the current sensor 8 is provided in the power conversion device 50.
- the power conversion device 50 includes a current detection module 31, an inverter circuit 51, a smoothing capacitor 52, an inverter circuit board 59, and terminals P1, P2, P3, P4, P5, P6, and P7.
- One end on the right side of the bus bars 7U, 7V, 7W of the current detection module 31 is connected to terminals P5, P6, P7, respectively.
- a load such as a three-phase motor is usually connected to terminals P5, P6, and P7.
- the other ends on the left side of the bus bars 7U, 7V, 7W of the current detection module 31 are connected to output terminals 51U, 51V, 51W of the inverter circuit 51, respectively.
- the inverter circuit 51 is connected to a high voltage power source (not shown) via the smoothing capacitor 52 and the terminal P1, and power for output to the outside is output from the high voltage power source via the terminals P5, P6, and P7. Have been supplied.
- the inverter circuit 51 includes a high-side U-phase switch UH, a V-phase switch VH, a W-phase switch WH, and a low-side U-phase switch UL, a V-phase switch VL, and a W-phase switch WL. These switches are controlled by the control circuit 53.
- the inverter circuit board 59 includes a control circuit 53 and a switch 54.
- the control circuit 53 is supplied with low voltage power from a low voltage power source (not shown) via a terminal P3.
- the control circuit 53 operates in response to a control communication signal from a control device (not shown) via the terminal P2.
- the control circuit 53 not only controls the switches UH, VH, WH, UL, VL, WL included in the inverter circuit 51 but also controls the switch 54.
- the switch 54 is controlled to be turned off at the time of calibration described later, and is controlled to be turned on at other times (normal time).
- the control circuit 53 normally receives detection signals from the current sensors 8U, 8V, 8W.
- the switch 54 is turned off during calibration so that the signal of the communication terminal 3 is not input to the control circuit 53 so that the calibration device can correct (rewrite) the setting data of the current sensor 8 normally. Because.
- FIG. 14 shows calibration in the present embodiment.
- the calibration of the current sensors 8U, 8V, and 8W is performed by attaching the calibration device 220 to the power conversion device 50.
- the calibration device 220 includes a current sensor calibration unit 225, an alternating current generation unit 224, bus bars 222U, 222V, and 222W, and reference current sensors 229U, 229V, and 229W.
- the current sensor calibration unit 225 includes a current sensor output comparison unit adapted to three-phase alternating current detection, a current sensor communication unit, and a switch.
- Bus bars 222U, 222V, and 222W of calibration device 220 are connected to terminals P5, P6, and P7 of power conversion device 50, respectively.
- the three-phase calibration AC current generated from the AC current generation unit 224 is input to the power conversion device 50 from the terminals P5, P6, and P7 via the bus bars 222U, 222V, and 222W, respectively.
- a three-phase calibration AC current flows through the bus bars 7U, 7V, and 7W.
- detection signals output from the current sensors 8U, 8V, and 8W of the power conversion device 50 are input to the current sensor calibration unit 225.
- Output signals of the reference current sensors 229U, 229V, and 229W are also input to the current sensor calibration unit 225.
- the current sensor calibration unit 225 calculates the difference between the detection signals of the current sensors 8U, 8V, and 8W and the output signals of the reference current sensors 229U, 229V, and 229W for the U phase, the V phase, and the W phase, respectively. Based on these differences, correction data for correcting the setting data of each phase is generated and output to the current sensors 8U, 8V, and 8W, respectively.
- the switch 54 is controlled to be turned off when the setting data stored in the memory 15 of the current sensor circuit 1 of the current sensor 8 is corrected, that is, during calibration. After the switch 54 is turned off and disconnected from the control circuit 53, the calibration device 220 corrects the setting data. Note that, during calibration of the present embodiment, the power supply from the high voltage power source is stopped.
- the U-phase switch UH, the V-phase switch VH, and the W-phase switch WH on the high side are all turned off.
- all of the low-side U-phase switch UL, V-phase switch VL, and W-phase switch WL are turned on.
- a point corresponding to the point 122P shown in FIG. 12 is formed in the inverter circuit 51, so that the current flowing through the three-phase bus bars 7U, 7V, 7W merges at one point. become.
- the connection in the calibration of the present embodiment is as described above. Note that the calibration flowchart of the present embodiment is the same as that of the second embodiment, and a description thereof will be omitted.
- the current sensor of the present embodiment has the following configuration and exhibits the following operational effects.
- the current sensor 8 is electrically connected to the inverter circuit 51 including a plurality of switching elements UH, UL, VH, VL, WH, WL, the inverter DC terminal P1 electrically connected to the inverter circuit 51, and the inverter circuit 51. It is mounted on a power converter 50 having inverter AC terminals P5, P6, and P7 to be connected.
- the plurality of bus bars 7U, 7V, 7W are connected to the inverter circuit 51 and inverter AC terminals P5, P6, P7.
- Each switching element UH, UL, VH, VL, WH, WL of the inverter circuit 51 is set to a predetermined switch state, that is, the high-side U-phase switch UH, V-phase switch VH, and W-phase switch WH are all turned off. To do. On the other hand, all of the low-side U-phase switch UL, V-phase switch VL, and W-phase switch WL are turned on.
- inverter AC terminals P5, P6, and P7 to an AC current generator 224 that is a calibration current source provided outside power converter 50, the AC current for calibration flows through a plurality of bus bars 7U, 7V, and 7W.
- the current sensor 8 can be calibrated without removing the current sensor 8 from the power conversion device 50. Further, unlike the second embodiment, the current sensor 8 is calibrated in the power conversion device 50 in which the current sensor 8 is actually mounted. Therefore, conditions closer to the actual use environment (for example, conditions such as magnetic flux density distribution) ) Can be calibrated.
- FIG. 15 is a diagram illustrating calibration according to the present embodiment. Also in this embodiment, the current sensor 8 is mounted on the power conversion device 50 shown in FIG. 13, and the current sensor 8 is calibrated in this state.
- the main feature of the third embodiment is that the calibration device 320 does not include an alternating current generator, that the calibration device 320 is also connected to the motor M, and that calibration is performed using the alternating current output by the power converter 50. This is a major difference. Note that description of the same configuration as that of the third embodiment is omitted.
- the current sensor 8 is calibrated when the power conversion device 50 is outputting AC power to the motor M as a load.
- the calibration device 320 of the present embodiment is provided between the power conversion device 50 and the motor M. One end of the windings 61, 62, 63 of the motor M is connected to the calibration device 320, but the other ends of the windings 61, 62, 63 are connected to each other.
- the calibration device 320 includes a current sensor calibration unit 325, bus bars 322U, 322V, and 322W, and reference current sensors 329U, 329V, and 329W. That is, the calibration device 320 does not include an alternating current generator.
- high voltage power from a high voltage power source of the power conversion device 50 is used.
- the control circuit 53 includes switches UH, UL, VH, VL, and so on so that the inverter circuit 51 outputs a three-phase alternating current. WH and WL are controlled.
- the alternating current output from the inverter circuit 51 flows through the bus bars 7U, 7V, and 7W, passes through the terminals P5, P6, and P7, and then flows through the bus bars 322U, 322V, and 322W of the calibration device 320 and the U-phase winding of the motor M. 61, the V-phase winding 62, and the W-phase winding 63.
- detection signals output from the current sensors 8U, 8V, and 8W of the power conversion device 50 are input to the current sensor calibration unit 325.
- Output signals of the reference current sensors 329U, 329V, and 329W are also input to the current sensor calibration unit 325.
- the current sensor calibration unit 325 calculates the difference between the detection signals of the current sensors 8U, 8V, and 8W and the output signals of the reference current sensors 329U, 329V, and 329W for each of the U phase, the V phase, and the W phase. Based on these differences, correction data for correcting the setting data of each phase is generated and output to the current sensors 8U, 8V, and 8W, respectively.
- the switch 54 is controlled to be turned off when the setting data stored in the memory 15 of the current sensor circuit 1 of the current sensor 8 is corrected, that is, during calibration. After the switch 54 is turned off and disconnected from the control circuit 53, the calibration device 220 corrects the setting data.
- the current sensor of the present embodiment has the following configuration and exhibits the following operational effects.
- the current sensor 8 includes an inverter circuit 51 including a plurality of switching elements UH, UL, VH, VL, WH, WL for converting DC power into AC power, and inverter output terminals P5, P6 for outputting AC power. , P7.
- the plurality of bus bars 7U, 7V, 7W are connected to the inverter circuit 51 and inverter output terminals P5, P6, P7.
- this embodiment it calibrates with the alternating current which the power converter device 50 actually outputs. Since the current sensor 8 uses the alternating current as a measurement target, it is possible to prevent the detection signal output from the current sensor 8 from including an error as compared with the third embodiment.
- the structural mold 6 shown in FIGS. 1 and 2 is fixed to the bus bar 7, the present invention is not limited to this.
- the structural mold 6 may be fixed to the inverter circuit board 9 or may be provided integrally with a mold member included in the inverter circuit board 9.
- the current sensor substrate shown in FIGS. 1 and 2 is separate from the inverter circuit substrate, but may be provided integrally with the inverter circuit substrate.
- the magnetic shield 5 shown in FIG. 2 is provided in a square U shape, but the present invention is not limited to this. For example, a round U shape may be sufficient and the shield shape divided
- the memory 15 of the current sensor 8 may store setting data at a plurality of frequencies.
- the frequency of the alternating current used in calibration is not limited to one, and a plurality of frequencies can be used. Further, one of the frequencies may be zero, that is, a direct current.
- the magnetic flux detection unit 11 in FIG. 3 may have a magnetic flux detection element other than the Hall element. For example, you may make it have a giant magnetoresistive element (GMR element).
- GMR element giant magnetoresistive element
- the present invention can be applied when an N-phase (N is an integer of 2 or more) multiphase alternating current is used as a measurement target. Note that, as shown in the first embodiment, the present invention can also be applied when a single-phase alternating current is a measurement target.
- the current sensor 8 is corrected by correcting the setting data (offset data, output gain data) stored in the memory 15 based on the correction data received from the current sensor communication unit 27 of the calibration device 20.
- the setting data and the correction data may be stored in the memory 15, and based on these data, the calibrated setting data may be output from the control unit 13 to the signal adjustment unit 12.
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Abstract
Description
図1及び図2は、本実施形態の電流センサ8がインバータ装置に実装された例を示している。図2は、矢印YA1から図1を見たときの矢視図である。
電流センサ8は、バスバ7に流れる電流によって生じる磁束を検出して、検出信号をインバータ回路基板9に出力する。
インバータ回路基板9は、インバータの制御基板であり、電流センサ8から受信した検出信号を用いてフィードバック制御を行う。
電流センサ基板2は、電流センサ回路1、通信端子3、および、周辺電子部品4を搭載する基板である。電流センサ基板2は、電流センサ回路1がバスバ7に対して所定の距離だけ離れて位置するように、構造モールド6でバスバ7に固定されている。
電流センサ回路1は、磁束検出部11と、信号調整部12と、制御部13と、通信部14と、メモリ15と、を備えている。
メモリ15は、データの書き換えが可能なメモリであり、例えば、EEPROMなどで構成される。メモリ15は、オフセットデータおよび出力ゲインデータを有する設定データを記憶する。メモリ15に記憶された設定データは、制御部13により、信号調整部12に適宜出力される。また、後述する設定データの校正時には、制御部13により、メモリ15に記憶された設定データが補正される。
バスバ22は、銅などの導体で形成されている。バスバ22は、両端が交流電流発生部24に接続されている。基準電流センサ29および電流センサ8は、バスバ22を流れる交流電流(後述する校正用交流電流)を検出し、検出信号を電流センサ出力比較部26に出力する。
交流電流発生部24は、単相交流電流発生源であり、不図示の電圧調整部と不図示のトランス部とで主に構成されている。交流電流発生部24は、電流センサ出力比較部26と通信しており、電流センサ出力比較部26から指令を受けて、バスバ22に対して交流電流を出力する。この交流電流を校正用交流電流と呼ぶことにする。
電流センサ通信部27は、上記の出力電圧の差に基づいて、電流センサ8のメモリ15に記憶されている設定データを補正するための補正データを生成し、電流センサ8に出力する。電流センサ8は、補正データを用いて、メモリ15が有する設定データを補正する。
スイッチ21は、電流センサ8の接続先を電流センサ出力比較部26と電流センサ通信部27との間で切り替える。
ステップS02では、バスバ22には電流が流れない。その状態で、電流センサ出力比較部26は、電流センサ8および基準電流センサ29のそれぞれのオフセット電圧を計測する。ステップS02の後、ステップS03に入る。
ステップS03において、電流センサ出力比較部26は、電流センサ8のオフセット電圧から基準電流センサ29のオフセット電圧を差し引くことで、オフセット電圧誤差を算出する。電流センサ出力比較部26は、オフセット電圧誤差を有するオフセット補正データを電流センサ通信部27に送信する。ステップS03の後、ステップS04に入る。
ステップS04において、電流センサ通信部27は、上記のオフセット補正データを電流センサ8に出力する。電流センサ8において、制御部13は、上記のオフセット補正データを用いて、メモリ15が有する設定データのオフセットデータを補正する。具体的には、設定データのオフセットデータにオフセット電圧誤差を加算する。ステップS04の後、ステップS05に入る。
ステップS05において、電流センサ出力比較部26は、ステップS02と同様に、バスバ22に通電しない状態で、電流センサ8および基準電流センサ29のそれぞれのオフセット電圧を計測する。そして、電流センサ出力比較部26は、電流センサ8のオフセット電圧の電圧値が目標とする出力範囲に入っているか確認する。すなわち、電流センサ出力比較部26は、電流センサ8のオフセット電圧から基準電流センサ29のオフセット電圧を差し引いた時の差が所定値以下であるかを判定する。肯定判定されれば、ステップS06に入る。否定判定されればステップS02に入り、以下同様の流れをたどる。なお、ステップS05で、所定の回数、例えば、5回否定判定されたら、電流センサ8は製品不良とされる。
ステップS07において、電流センサ出力比較部26は、電流センサ8の電圧波形と基準電流センサ29の電圧波形から、出力ゲイン誤差を算出する。電流センサ出力比較部26は、出力ゲイン誤差を有する出力ゲイン補正データを電流センサ通信部27に送信する。ステップS07の後、ステップS08に入る。
ステップS08において、電流センサ通信部27は、上記の出力ゲイン補正データを電流センサ8に出力する。電流センサ8において、制御部13は、上記の出力ゲイン補正データを用いて、メモリ15が有する設定データの出力ゲインデータを補正する。具体的には、設定データの出力ゲインデータに出力ゲイン誤差を加算する。ステップS08の後、ステップS09に入る。
ステップS09において、電流センサ出力比較部26は、ステップS06と同様に、バスバ22に校正用交流電流を流した状態で、電流センサ8および基準電流センサ29のそれぞれの出力電圧波形を計測する。そして、電流センサ出力比較部26は、電流センサ8の出力ゲインによって増幅された電圧が目標とする出力範囲に入っているか確認する。すなわち、電流センサ出力比較部26は、電流センサ8の出力電圧波形の振幅と基準電流センサ29の出力電圧波形の振幅との差が所定値以下であるかを判定する。肯定判定されれば、ステップS10に入りフローを終了する。否定判定されればステップS06に入り、以下同様の流れをたどる。なお、ステップS09で、所定の回数、例えば、5回否定判定されたら、電流センサ8は製品不良とされる。
また、直流電流の場合、0A(第1調整点)と上記の校正できるプラス側の電流値(第2調整点)の2点で校正することが多く、マイナス側については、校正されないことが多い。その結果、破線L3のように校正すべきであるところを、実際は、実線L4のように校正されてしまう可能性がある。
以上より、直流電流で校正した場合には、校正されていない電流領域があり、上述した表皮効果(図4,図5参照)以外のことが原因で、出力電圧に誤差が生じる可能性がある。
(1)電流センサ8は、導体であるバスバ7、22に流れる交流電流によって生じる磁束を検出することで当該交流電流を検出する磁束検出部11と、バスバ22に流れる所定の校正用交流電流を磁束検出部11により検出した検出値に基づく設定データを記憶するメモリ15と、を備える。
これによって、電流センサ8が交流電流を検出する時に、検出誤差が生じないようにすることができる。
これによって、電流センサ8が測定対象とされる交流電流を検出する時に誤差が生じないようにすることができる。
これによって、電流センサ8が交流電流を検出して検出信号を外部に出力する時に、高精度な検出信号を出力することができる。
これによって、通信端子をいたずらに増やす必要がなくなり、省スペース化に貢献できる。
これによって、磁束検出部11とメモリ15と通信端子3とを電流センサ基板2の上にまとめることができる。
図10(a)は、電流検出ユニット30を示している。電流検出ユニット30は、バスバ7に電流センサ8が設けられたもので、バスバ7を流れる電流を電流センサ8が検出するものである。電流検出ユニット30は、図10(b)に示すように、電流検出モジュール31を構成する。電流検出モジュール31は、用いる交流電流の相数に応じた数の電流検出ユニット30を有する。図10(b)には、3相交流電流用の電流検出モジュール31が示されている。図10(b)に示す電流検出モジュール31は、3相交流電流を流すためのものなので、3つの電流検出ユニット30を有する。以降の説明のため、図10(b)に示す3つの電流検出ユニット30のそれぞれを30U,30V,30Wと、符号を付し直す。また、電流検出ユニット30U,30V,30Wが有するバスバを、それぞれバスバ7U、7V、7Wと符号を付し直す。電流検出ユニット30U,30V,30Wが有する電流センサを電流センサ8U、8V、8Wと符号を付し直す。
このように、複数の相が流れる電流検出モジュール31においては、ある電流検出ユニット30の電流センサがその電流検出ユニット30以外の電流検出ユニット30に流れる電流によって生じた磁束までも検出するという問題が起こる。具体的に説明する。図10(b)に示されている電流の向きは、U相とW相が図示下向き、V相が図示上向きとなっており、隣り合う電流検出ユニット30のバスバ7に流れる電流の向きが互いに逆になっている。これによって、磁束同士が干渉し、本来検出すべき磁束の値よりも小さい値を検出することになる。
本実施形態では3相交流電流を用いて校正する。この点が、第1実施形態の校正(図6)との主な相違点である。
校正装置120は、校正される対象である電流センサ8U、8V、8W(製品センサ)を少なくとも除いた構成を有している。すなわち、校正装置120は、電流センサ校正部125と、交流電流発生部124と、バスバ122と、基準電流センサ129U,129V,129Wと、を備えている。なお、図示していないが、電流センサ校正部125は、3相交流電流検出に合わせた電流センサ出力比較部と、電流センサ通信部と、スイッチと、を備えている。
バスバ122は、バスバ122U、122V、122Wを有している。バスバ122U、122V、122Wの一端は点122Pで互いに接続され、他端はそれぞれ交流電流発生部124に接続されている。バスバ122U、122V、122Wには、それぞれ、基準電流センサ129U、129V、129Wと、校正される対象である電流センサ8U、8V、8Wが設けられている。
交流電流発生部124は、電流センサ校正部125の指令に応じて3相交流電流を出力する。そのため、点122Pでは、各相の電流の和がゼロになる。すなわち、IU+IV+IW=0Aが成り立つ。
本実施形態の校正のフローチャートは、3相か単相かの違いはあるが、それ以外は第1実施形態の校正フローチャート(図7)と同様であるので説明を省略する。
磁束検出部11は、3つのバスバに流れる3相交流電流によって生じる磁束を検出することで当該3つのバスバに流れる3相交流電流をそれぞれ検出する。校正用交流電流も、測定対象に合わせて3相交流電流であり、各相の電流が3つのバスバのそれぞれを流れる。
これによって、他の相の交流電流による干渉によって生じる誤差を補正することができ、電流センサ8の出力に当該誤差が含まれなくなる。
図13は、電流センサ8を備える電力変換装置50(インバータ装置50)を示している。電流センサ8は、図10(b)に示されているような3相交流電流検出用の電流検出モジュール31に設けられている。その電流検出モジュール31が電力変換装置50に設けられることで、電流センサ8は電力変換装置50に設けられる。
校正装置220のバスバ222U,222V,222Wは、それぞれ、電力変換装置50の端子P5、P6、P7に接続される。交流電流発生部224から発生された3相の校正用交流電流は、バスバ222U,222V,222Wを介して、端子P5,P6,P7から電力変換装置50にそれぞれ入力される。これにより、バスバ7U,7V,7Wに3相の校正用交流電流が流れる。このとき電力変換装置50の電流センサ8U,8V,8Wから出力される検出信号は、電流センサ校正部225に入力される。基準電流センサ229U,229V,229Wの出力信号も、電流センサ校正部225に入力される。電流センサ校正部225は、U相、V相、W相のそれぞれについて、電流センサ8U,8V,8Wの検出信号と、基準電流センサ229U,229V,229Wの出力信号との差をそれぞれ算出する。そして、これらの差に基づいて、各相の設定データを補正するための補正データを生成し、電流センサ8U,8V,8Wにそれぞれ出力する。スイッチ54は、電流センサ8の電流センサ回路1のメモリ15に記憶されている設定データを補正する時、すなわち、校正時にはオフとなるように制御される。スイッチ54をオフにして制御回路53と切り離してから、校正装置220により上記の設定データが補正される。
なお、本実施形態の校正時は、高電圧電力源からの電力供給を停止する。また、インバータ回路51において、ハイサイド側のU相スイッチUH,V相スイッチVH,W相スイッチWHは、いずれもオフにする。一方、ローサイド側のU相スイッチUL,V相スイッチVL,W相スイッチWLは、いずれもオンにする。このようなスイッチ状態にすることで、インバータ回路51において図12に示す点122Pに相当する点を形成することになり、3相のバスバ7U,7V,7Wに流れる電流が1点で合流するようになる。本実施形態の校正における接続は以上である。なお、本実施形態の校正のフローチャートは、第2実施形態と同様であるので説明を省略する。
電流センサ8は、複数のスイッチング素子UH,UL,VH,VL,WH,WLを含むインバータ回路51と、インバータ回路51と電気的に接続されるインバータ直流端子P1と、インバータ回路51と電気的に接続されるインバータ交流端子P5,P6,P7と、を有する電力変換装置50に搭載される。
複数のバスバ7U,7V,7Wは、インバータ回路51とインバータ交流端子P5,P6,P7とに接続される。
インバータ回路51の各スイッチング素子UH,UL,VH,VL,WH,WLを所定のスイッチ状態、すなわち、ハイサイド側のU相スイッチUH,V相スイッチVH,W相スイッチWHは、いずれもオフにする。一方、ローサイド側のU相スイッチUL,V相スイッチVL,W相スイッチWLは、いずれもオンにする。
インバータ交流端子P5,P6,P7を電力変換装置50の外部に設けた校正用電流源である交流電流発生部224と接続することで校正用交流電流が複数のバスバ7U,7V,7Wを流れる。
これによって、電流センサ8を電力変換装置50から取り外すことなく、電流センサ8の校正を行うことができる。また、第2実施形態と異なり、電流センサ8が実際に搭載される電力変換装置50の中で電流センサ8を校正するので、より実際の使用環境に近い条件(例えば、磁束密度分布などの条件)で校正することができる。
図15は、本実施形態の校正について示した図である。本実施形態でも、電流センサ8は、図13に示した電力変換装置50に搭載され、その状態で電流センサ8を校正する。校正装置320が交流電流発生部を備えていないこと、校正装置320がモータMにも接続されていること、電力変換装置50が出力する交流電流で校正することが、第3実施形態との主な相違点である。なお、第3実施形態と同様の構成については、説明を省略する。
電流センサ8は、直流電力を交流電力に変換するための複数のスイッチング素子UH,UL,VH,VL,WH,WLを含むインバータ回路51と、交流電力を出力するためのインバータ出力端子P5,P6,P7とを有する電力変換装置50に搭載される。
複数のバスバ7U,7V,7Wは、インバータ回路51とインバータ出力端子P5,P6,P7とに接続される。
インバータ回路51からインバータ出力端子P5,P6,P7に接続されたモータMへと交流電力が出力されることにより、校正用交流電流が複数のバスバ7U,7V,7Wを流れる。
このように、本実施形態では、電力変換装置50が実際に出力する交流電流で校正する。電流センサ8は、この交流電流を測定対象としているので、第3実施形態よりも、電流センサ8が出力する検出信号に誤差が含まれないようにすることができる。
図1、2に示した構造モールド6は、バスバ7に固定されているが、本発明はこれに限定されない。例えば、構造モールド6はインバータ回路基板9に固定されたり、インバータ回路基板9が有するモールド部材と一体的に設けたりしてもよい。
図1、2で示した電流センサ基板は、インバータ回路基板と別体となっていたが、インバータ回路基板と一体的に設けてもよい。
図2で示した磁気シールド5は、四角U字型で設けられているが、本発明はこれに限定されない。例えば、丸U字型でもよいし、複数に分割されたシールド形状でもよい。
電流センサ8のメモリ15が複数の周波数における設定データを記憶することができるようにしてもよい。その場合、校正において用いる交流電流の周波数は、1つだけでなく、複数用いることができる。また、そのうちの1つの周波数をゼロ、すなわち、直流電流にあててもよい。
図3の磁束検出部11はホール素子以外の磁束検出素子を有するようにしてもよい。例えば、巨大磁気抵抗素子(GMR素子)を有するようにしてもよい。
図7のフローチャートでは、校正装置20の電流センサ通信部27から受信した補正データに基づいて、メモリ15に記憶されている設定データ(オフセットデータ、出力ゲインデータ)を補正することで、電流センサ8を校正するようにした。しかし、設定データと補正データをメモリ15にそれぞれ記憶しておき、これらのデータに基づいて、校正された設定データを制御部13から信号調整部12に出力してもよい。
2:電流センサ基板
3:通信端子
4:周辺電子部品
5:磁気シールド
6:構造モールド
7:バスバ
8:電流センサ
9:インバータ回路基板
11:磁束検出部
12:信号調整部
13:制御部
14:通信部
15:メモリ
20、120、220、320:校正装置
21:スイッチ
22:バスバ
24:交流電流発生部
25:電流センサ校正部
26:電流センサ出力比較部
27:電流センサ通信部
29:基準電流センサ
30:電流検出ユニット
31:電流検出モジュール
50:電力変換装置(インバータ装置)
51:インバータ回路
51U、51V、51W:出力端子
52:平滑用キャパシタ
53:制御回路
54:スイッチ
59:インバータ回路基板
61:U相巻線
62:V相巻線
63:W相巻線
M:モータ
P1、P2、P3、P4、P5、P6、P7:端子
Claims (8)
- 導体に流れる交流電流を検出する電流検出部と、
前記導体に流れる所定の校正用交流電流を前記電流検出部により検出した検出値に基づく設定データを記憶する記憶部と、を備える電流センサ。 - 請求項1に記載の電流センサにおいて、
前記電流検出部による前記交流電流の検出結果と前記記憶部に記憶された前記設定データとに基づく検出信号を出力する信号出力部をさらに備える電流センサ。 - 請求項1または2に記載の電流センサにおいて、
前記校正用交流電流の周波数は、測定対象とされる前記交流電流の周波数に基づいて決定される電流センサ。 - 請求項1または2に記載の電流センサにおいて、
前記電流検出部は、複数の導体に流れる前記交流電流をそれぞれ検出し、
前記校正用交流電流は、多相交流電流であり、各相電流が前記複数の導体のそれぞれを流れる電流センサ。 - 請求項4に記載の電流センサにおいて、
複数のスイッチング素子を含むインバータ回路と、前記インバータ回路と電気的に接続されるインバータ直流端子と、前記インバータ回路と電気的に接続されるインバータ交流端子と、を有する電力変換装置に搭載され、
前記複数の導体は、前記インバータ回路と前記インバータ交流端子とに接続され、
前記インバータ回路の各スイッチング素子を所定のスイッチ状態とし、
前記インバータ交流端子を前記電力変換装置の外部に設けた校正用電流源と接続することで前記校正用交流電流が前記複数の導体を流れる電流センサ。 - 請求項4に記載の電流センサにおいて、
直流電力を交流電力に変換するための複数のスイッチング素子を含むインバータ回路と、前記交流電力を出力するためのインバータ出力端子とを有する電力変換装置に搭載され、
前記複数の導体は、前記インバータ回路と前記インバータ出力端子とに接続され、
前記インバータ回路から前記インバータ出力端子に接続された負荷へと前記交流電力が出力されることにより、前記校正用交流電流が前記複数の導体を流れる電流センサ。 - 請求項1または2に記載の電流センサにおいて、
前記検出信号を出力し、かつ、前記設定データに関する補正データを受信するための通信端子をさらに備える電流センサ。 - 請求項7に記載の電流センサにおいて、
前記電流検出部と前記記憶部とが少なくとも設けられた基板をさらに備え、
前記通信端子は、前記基板に設けられている電流センサ。
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| JP2016573298A JP6513715B2 (ja) | 2015-02-06 | 2016-01-27 | 電流センサ |
| EP16746469.2A EP3255441A4 (en) | 2015-02-06 | 2016-01-27 | Electric current sensor |
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| EP (1) | EP3255441A4 (ja) |
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| JP7224513B1 (ja) | 2022-05-10 | 2023-02-17 | 三菱電機株式会社 | 電力変換装置 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107209209A (zh) | 2017-09-26 |
| US20180017656A1 (en) | 2018-01-18 |
| EP3255441A1 (en) | 2017-12-13 |
| JP6513715B2 (ja) | 2019-05-15 |
| EP3255441A4 (en) | 2018-12-12 |
| JPWO2016125638A1 (ja) | 2017-09-14 |
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