CN202735388U - Current sensor control device - Google Patents
Current sensor control device Download PDFInfo
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- CN202735388U CN202735388U CN2012200458374U CN201220045837U CN202735388U CN 202735388 U CN202735388 U CN 202735388U CN 2012200458374 U CN2012200458374 U CN 2012200458374U CN 201220045837 U CN201220045837 U CN 201220045837U CN 202735388 U CN202735388 U CN 202735388U
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- 230000005389 magnetism Effects 0.000 claims abstract description 19
- 230000005012 migration Effects 0.000 claims description 39
- 238000013508 migration Methods 0.000 claims description 39
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000005070 sampling Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 230000005347 demagnetization Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
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Abstract
The utility model relates to a current sensor control device, which is used for compensating offset, generated by error caused by residual magnetism of a current sensor and error caused by time variation, of the current sensor. The current sensor control device comprises a current sensor (6), an offset compensation part (7) and a circuit part, wherein the current sensor (6) is used for detecting current flowing through a load; the offset compensation part (7) is used for compensating offset of the current sensor (6); and the circuit part is used for generating degaussing current for reducing residual magnetism of the current sensor, calculating an offset value of the current sensor (6) by using a measurement value, measured by the current sensor, of the degaussing current and a current value, corresponding to the measurement value, of the degaussing current, and compensating offset based on the offset value.
Description
Technical field
The utility model relates to a kind of current sensor control device.
Background technology
The control device of known a kind of motor (patent documentation 1), it has: current detector, it detects the electric current of supplying with from the electric power amplifying unit to motor; And the current offset compensation section, it compensates the off-set value that comprises in the output of current detector, has in the control device of this motor: demagnetization signal instruction section, and its alternating signal that will decay along with the time is supplied with to this current detector; And switch, it switches this demagnetization supplies with to next stage with the output signal of signal instruction section with based on the signal of current command signal value, making after this alternating signal flows into this current detector, this electric power amplifying unit is stopped, and calculates off-set value.
The utility model content
But in the control device of existing motor, existence can't be to because the problem that the detection error of the current detector that the time fluctuation key element produces compensates.
Problem to be solved in the utility model is, the error that the error that compensation is caused by the remanent magnetism of current sensor and time fluctuation cause and the skew of the current sensor that produces.
The utility model solves the problems referred to above by the following method: the current sensor control device has: current sensor, and it detects the electric current that flows through in the load; Migration section, its skew to described current sensor compensates; And circuit part, the erasing current that its generation reduces the remanent magnetism of described current sensor, section inputs to current sensor with erasing current by control circuit, described migration section uses the measured value of the erasing current of being measured by this current sensor and the current value of the erasing current corresponding with this measured value, the current sensor offset value is carried out computing, and based on described off-set value described skew is compensated.
The effect of utility model
According to the utility model, flow through erasing current in the current sensor by making, the error that inhibition is caused by the remanent magnetism of current sensor, and the error that the variable factor by the time causes is detected the therefore more accurately skew of offset current sensor according to the measured value of erasing current.
Description of drawings
Fig. 1 is the circuit diagram of the current sensor control device that relates to of embodiment of the present utility model.
Fig. 2 is the curve of current characteristics of the time of the erasing current that flows through in the current sensor of expression with respect to Fig. 1.
Fig. 3 is illustrated in the current sensor of Fig. 1, with respect to the curve of the characteristic of the measured value (output voltage) of the current value of erasing current.
Fig. 4 is the process flow diagram of part of control sequence of the current sensor control device of presentation graphs 1.
Embodiment
Below, based on accompanying drawing embodiment of the present utility model is described.
The 1st embodiment
Fig. 1 is the circuit diagram of the current sensor control device that relates to of embodiment of expression utility model.Although omit detailed diagram, this routine current sensor control device for example is connected with the accumulator that carries in electric automobile or hybrid vehicle, uses as the sensor control that the DC current from this accumulator is detected.In addition, the control device for inverter that this is routine is in the vehicle that also can be applied to outside the electric automobiles such as hybrid vehicle.
As shown in Figure 1, this routine current sensor control device 1 comprises accumulator 2, switch S 1～S3, resistance R, telefault L, capacitor C, current sensor 6, migration section 7.Accumulator 2 is such as being by the secondary cell such as a plurality of lithium ion batteries or one-shot battery are connected the direct supply that consists of.Accumulator 2 is the electric power source to not shown motor even load supply capability.
Switch S 1～S3 is connected between accumulator 2 and the current sensor 6, switches based on the control signal of migration section 7 to switch on and off.At the positive terminal side connecting valve S1 of accumulator 2 and the parallel circuit of switch S 2, at the negative terminal side connecting valve S3 of accumulator 2.Between the terminal of accumulator 2, via switch S 1 and switch S 3, connect the RLC series circuit that is formed by resistance R, telefault L and capacitor C in addition.
Below, referring to figs. 1 through Fig. 3, the control of current sensor control device 1 is described.Fig. 2 is the performance plot of the waveform of expression erasing current, is that expression is with respect to the curve of the current characteristics of time.Fig. 3 is that the output voltage (V) of expression current sensor is with respect to the curve of the characteristic of the current value (I) of erasing current.
And, migration section 7, in current sensor 6, flow through erasing current during, with the regulation cycle (Ta) measured value of current sensor 6 is sampled.In addition, the current value of the erasing current corresponding with the measured value of sampling based on the control signal for generation of erasing current that inputs to switch S 1 and S3, calculates in migration section 7.The state of accumulator 2 forms resistance R, telefault L and the capacitor C parameter separately of rlc circuit by 7 management of migration section, predetermine at circuit design stage, so the current waveform that flows through in this rlc circuit is also preseted.Therefore, if know the timing of the sampling that begins when flowing through erasing current, then can derive the current value of erasing current.Namely, migration section 7 when beginning to flow through erasing current as benchmark, make sampling time of measured value of current sensor 6 corresponding with the sampling time of the current value of erasing current, measure the measured value of current sensor 6 according to the output voltage of current sensor 6, calculate the current value of erasing current according to the value of predefined current waveform.
In addition, when measuring the measured value of current sensor 6, the start time of sampling is set as the time (tc) (with reference to Fig. 2).From making erasing current begin to flow through until till the elapsed time (tc) during, the impact of remanent magnetism is very large, therefore migration section 7 is from the moment after erasing current being begun flow through beginning elapsed time (tc), and (Ta) samples to the output voltage of voltage sensor 6 with the sampling period.Time (tc) is by the 7 predefined times of migration section, be preferably set to from make erasing current begin to flow through through time of initial 1 all after date of erasing current.As shown in Figure 2, begin to flow through beginning from making erasing current, the current value in 1 initial cycle is larger than the current value after 2 cycles.Therefore, when setting-up time (tc), from sampling, get rid of the current waveform in 1 initial cycle, thereby can prevent that remanent magnetism from producing considerable influence to sampled value.
And migration section 7 utilizes current sensor 6 to measure erasing current, until residual current converges to zero.In addition, in Fig. 2, black circle expression offsets the timing that magnetoelectricity stream is sampled.
Then, migration section 7, with each sampling timing accordingly, the current value of the measured value (output voltage) of current sensor 6 and erasing current marked and drawed be electric current-voltage characteristic figure.And the approximate function for the data that obtain plotting carries out the straight line recursive operation, obtains I-V characteristic (straight line L) as shown in Figure 3.As shown in Figure 3, be equivalent to the magnitude of voltage of intercept, be equivalent to the detected value of current sensor 6 with respect to the error of the current value of erasing current, become off-set value (V
Off).That is, if do not produce error between the detection voltage of the current value of the actual erasing current that flows through and current sensor 6 in current sensor 6, then in the I-V characteristic of being obtained by migration section 7, the output voltage zero with respect to current value is zero.But in the situation that produce this skew, each output voltage of current sensor 6 and the amount of skew are correspondingly, produce respectively skew, therefore, I-V characteristic (straight line L) becomes the characteristic that correspondingly departs from off-set value with respect to ideal I-V characteristic (with reference to the figure of Fig. 3 dotted line).
And off-set value (V calculates according to the intercept of I-V characteristic in migration section 7
Off), from the measured value of current sensor 6, deduct the value that is equivalent to off-set value, thereby carry out migration, with the detection electric current (Ic) of the current sensor 6 after the compensation as the output current value of accumulator 1.Therefore, migration section 7 is based on off-set value (V
Off) skew of offset current sensor 6.
Below, according to Fig. 4 the control sequence of this routine current sensor control device 1 is described.Fig. 4 is the process flow diagram of the control sequence of this routine current sensor control device of expression.
In step S1, migration section 7 will represent that the control signal that flows through erasing current for the remanent magnetism that reduces current sensor 6 is sent to switch S 1 and S3, and switching on and off of change-over switch S1 and switch S 3 makes in the current sensor 6 and flow through erasing current.In step S2, migration section 7 grasps the time from beginning to flow through erasing current the current sensor 6, judges whether this time passed through the time (t
c).And, if passed through the time (t
c), then enter step S3.
In step S3, current sensor 6 is from time (t
c) the moment, measure erasing current with the sampling period of regulation, with measured value by voltage to 7 outputs of migration section.In step S4, migration section 7 judges whether erasing current converges to zero.In the situation that erasing current does not converge to zero, return step S3, in the situation that erasing current converges to zero, enter step S5.In step S5, migration section 7 is according to the current waveform of predefined erasing current, calculate with by current value corresponding to the measured value of step S3 mensuration, according to the measured value of current value and the current sensor 6 of the erasing current that calculates, computing is as the I-V characteristic of approximate function.
In step S6,7 computings of migration section are equivalent to the off-set value (Voff) of the intercept of the I-V characteristic that calculated by step S5, and, in step S7, migration section 7 deducts this off-set value (Voff) from the measured value of current sensor 6, thus the skew of offset current sensor 6.
As mentioned above, this example is utilized migration section 7, uses the current value of the erasing current that flows through in current sensor 6 and the measured value of current sensor 6, the off-set value of current sensor 6 is carried out computing, based on the skew of off-set value offset current sensor 6.Therefore, this example is by flowing through the remanent magnetism that erasing current reduces current sensor 6 in current sensor 6, the error that reduction is caused by the magnetic hysteresis amount of current sensor 6, and use the current value of erasing current and the measured value of current sensor 6, off-set value is carried out computing, can reduce the detection error of the current sensor 6 that is produced by element of time.
To as shown in the prior art, in the action that stops inverter and erasing current converges to after zero, use any situation of current value compensating offset of being measured by current sensor to describe in detail.Because the current sensor measured value of the reality the when variable of temperature characterisitic or aging characteristics equal time, erasing current are zero may contain the error more than or equal to original skew.At this moment, prior art is because based on the skew of this error compensation, so the measured value after the compensation departs from ideal value, and compensating offset accurately.
This example is not limited to the measured value of erasing current when being zero, the measured value of the current sensor 6 when flowing through erasing current by use, thus can increase the number of samples of measured value.And, suitably being reflected in the off-set value by obtaining the approximate function of sampling, can make the error equalization that is caused by time factor, its result can improve the precision of migration.In addition, with respect to the measurement range of current sensor 6, can carry out in the broader context migration.
In addition, this example is used the current value of erasing current and the measured value of current sensor 6, utilizes the straight line recursive operation that off-set value is carried out computing.Therefore, this example can detect the slope situation different from ideal line of the straight line L that utilizes the I-V characteristic that the straight line recursive operation calculates, before being used for by 6 pairs of current sensors detecting to the electric current that load is supplied with, and compensating offset.
In addition, in this example, in the slope of the straight line L of the I-V characteristic situation different from ideal line, can be for each measurement range compensating offset of current sensor 6, also can be corresponding to the straight line L of I-V characteristic and ideal line poor, calculate the off-set value corresponding with the measured value of current sensor 6, carry out migration.That is, for example with reference to Fig. 3, in the large situation of the slope of the slope ratio ideal line (dotted line by Fig. 4 represents) of straight line L, current value is larger, and deviating from of straight line L and ideal line is larger.Therefore, the larger then off-set value of current value is just larger, by deducting from measured value, can make measured value after the compensation near ideal line, and its result can improve the precision of migration.
In addition, the current sensor control device 1 that this is routine carries to vehicle, with switch (not shown) interlock that vehicle traction is used, carries out in the situation of step shown in Figure 4, when making this switch connection, current sensor 6 comprises the error that the remanent magnetism that produced by travelling of last time causes sometimes.But, in this example, when reducing remanent magnetism, compensate skew, therefore, can be by the impact that suppresses the remanent magnetism that travelling of last time cause, simultaneously compensating offset.
In addition, in this example, migration section 7 begins the elapsed time (t when utilizing from erasing current to current sensor 6 input
c) after measured value, off-set value is carried out computing.As shown in Figure 2,6 inputs the time begin to time (t from erasing current to current sensor
c) during, the impact of remanent magnetism is large, therefore, does not utilize until time (t
c) till the measured value of erasing current, but utilize time (t
c) later measured value carries out computing to off-set value.Therefore, can suppress the impact of remanent magnetism, and can extract for the sampling of off-set value being carried out computing, compensating offset.
In addition, this example uses rlc circuit as the circuit for generation of erasing current.Therefore, be this power supply that is difficult to produce erasing current of direct supply even use accumulator 4, also can produce erasing current.
In addition, this example arranges switch S 1 and S3 in the circuit for generation of erasing current, switching on and off of change-over switch S1 and S3 periodically, thus produce erasing current.Therefore, be this power supply that is difficult to produce erasing current of direct supply even use accumulator 4, also can produce erasing current.
In addition, in this example, use motor as an example of load, but also can be other load, in addition, this routine current sensor control device 1 also can use in other devices outside inverter.In addition, this example adopts the straight line I-V characteristic by the straight line recursive operation when calculating off-set value, but also other approximate functions such as available curve of approximation.In the situation that adopt other approximate functions, as long as on approximate function, the measured value when making erasing current zero gets final product as off-set value.
The circuit that is made of above-mentioned switch S 1 and S3, resistance R, telefault L, capacitor C is equivalent to " circuit part " of the present utility model.
Claims (3)
1. current sensor control device is characterized in that having:
Current sensor, it detects the electric current that flows through in the load;
Migration section, its skew to described current sensor compensates; And
Circuit part, the erasing current that its generation reduces the remanent magnetism of described current sensor,
Described migration section uses the measured value of the described erasing current of being measured by described current sensor and the current value of the described erasing current corresponding with described measured value, off-set value to described current sensor is carried out computing, and based on described off-set value described skew is compensated.
2. current sensor control device according to claim 1 is characterized in that,
Described circuit part has resistance, telefault and electric capacity.
3. current sensor control device according to claim 1 is characterized in that,
Described circuit part has switch element,
Described migration section generates described erasing current by switching switching on and off of described switch element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011044658A JP2012182920A (en) | 2011-03-02 | 2011-03-02 | Current sensor control device |
| JP2011-044658 | 2011-03-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202735388U true CN202735388U (en) | 2013-02-13 |
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ID=47013649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200458374U Expired - Fee Related CN202735388U (en) | 2011-03-02 | 2012-02-13 | Current sensor control device |
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| Country | Link |
|---|---|
| JP (1) | JP2012182920A (en) |
| CN (1) | CN202735388U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627788A (en) * | 2018-03-23 | 2018-10-09 | 宁波央腾汽车电子有限公司 | A kind of method and system of Hall current sensor magnetic hysteresis detection |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6202925B2 (en) * | 2013-07-31 | 2017-09-27 | 株式会社東芝 | VEHICLE CONTROL DEVICE AND VEHICLE CONTROL METHOD |
| KR101840084B1 (en) | 2014-01-24 | 2018-03-19 | 엘에스산전 주식회사 | Apparatus and method for controlling of electric motor |
| JP6429153B2 (en) | 2015-04-22 | 2018-11-28 | パナソニックＩｐマネジメント株式会社 | Shut-off device |
| JP7004204B2 (en) * | 2017-12-04 | 2022-01-21 | 株式会社Ｇｓユアサ | Measuring device, power storage device, measuring system, offset error measuring method |
| CN112834804A (en) * | 2020-12-30 | 2021-05-25 | 成都杰启科电科技有限公司 | Low-cost high-precision current acquisition sensor and control method thereof |
-
2011
- 2011-03-02 JP JP2011044658A patent/JP2012182920A/en not_active Withdrawn
-
2012
- 2012-02-13 CN CN2012200458374U patent/CN202735388U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627788A (en) * | 2018-03-23 | 2018-10-09 | 宁波央腾汽车电子有限公司 | A kind of method and system of Hall current sensor magnetic hysteresis detection |
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| Publication number | Publication date |
|---|---|
| JP2012182920A (en) | 2012-09-20 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20140213 |