CN105548662A - Hall effect current sensor with rapid transient response function - Google Patents
Hall effect current sensor with rapid transient response function Download PDFInfo
- Publication number
- CN105548662A CN105548662A CN201610096975.8A CN201610096975A CN105548662A CN 105548662 A CN105548662 A CN 105548662A CN 201610096975 A CN201610096975 A CN 201610096975A CN 105548662 A CN105548662 A CN 105548662A
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- hall effect
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- transduction pathways
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- 230000005355 Hall effect Effects 0.000 title claims abstract description 40
- 230000001052 transient effect Effects 0.000 title claims abstract description 17
- 238000005316 response function Methods 0.000 title abstract 2
- 230000004044 response Effects 0.000 claims abstract description 17
- 230000019491 signal transduction Effects 0.000 claims description 24
- 238000010586 diagram Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
- Hall/Mr Elements (AREA)
Abstract
The invention discloses a Hall effect current sensor with a rapid transient response function. The sensor comprises a Hall effect sensitive device and a signal read-out circuit of the Hall effect sensitive device. The signal read-out circuit comprises a high-precision signal channel and a negative feedback circuit of the high-precision signal channel. The high-precision signal channel comprises a first low noise amplifier, a first chopper and a low-pass filter which are sequentially and electrically connected. The two ends of the high-precision signal channel are connected with a rapid signal channel in parallel. The high-precision signal channel comprises a high-pass filter, a third chopper and a first amplifier which are sequentially and electrically connected. The gain of the high-precision signal channel is far larger than that of the rapid signal channel. The the equivalent offset voltage, obtained by converting the offset voltage of the rapid signal channel itself, of the output end of the Hall effect sensitive device is close to zero. By means of the Hall effect current sensor, the transient output of the sensor is more rapidly close to steady-state output, and the transient response speed of the sensor can be remarkably increased.
Description
Technical field
The invention belongs to integrated circuit fields, more specifically, relate to a kind of hall effect current sensor with fast transient response.
Background technology
Hall effect current sensor is widely used at non-contact type current detection field.Hall effect current sensor is generally made up of Hall effect Sensitive Apparatus and signal read circuit.Detect in application at non-contact type current, the magnetic field intensity produced by detecting electric current can extrapolate electric current to be measured, its based on principle be: Hall effect Sensitive Apparatus produces a small voltage relevant with surveyed magnetic field, signal read circuit this small voltage amplify export.
As shown in Figure 1, be the system architecture composition schematic diagram of a kind of hall effect current sensor of the prior art, it mainly comprises a Hall effect Sensitive Apparatus, a high-precision signal path based on instrument amplifier and a backfeed loop.In above-mentioned framework composition, in order to ensure sensor accuracy, usual employing chopped wave stabilizing technology Dynamic controlling Hall effect Sensitive Apparatus and instrument amplifier, the offset voltage of Hall effect Sensitive Apparatus and instrument amplifier and low-frequency noise are modulated to high frequency, then come the offset voltage after filtering modulation and low-frequency noise by low-pass filter.But; in some specific application scenarios; such as overcurrent protection in real time; require that hall effect current sensor has fast transient response; can detect that the change of electric current realizes overcurrent protection fast thus fast in time, but the low bandwidth of low-pass filter in hall effect sensor limits the transient response speed of hall effect current sensor.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of hall effect current sensor with fast transient response, its object is to the technical matters of the real-time guard under solution certain application cases.
For achieving the above object, according to one aspect of the present invention, provide a kind of Hall current sensor with fast transient response, this sensor comprises the signal read circuit of Hall effect Sensitive Apparatus and described Hall effect Sensitive Apparatus, described signal read circuit comprises high-precision signal path and negative feedback loop thereof, described high-precision signal path comprises the first low noise amplifier of order electrical connection, first chopper and low-pass filter, described negative feedback loop comprises divider resistance, and be electrically connected the second chopper of described divider resistance point pressure side and described high-precision signal path input, it is characterized in that, described high-precision signal path two ends are parallel with Rapid Signal Transduction Pathways, described Rapid Signal Transduction Pathways comprises the Hi-pass filter of order electrical connection, 3rd chopper and the first amplifier, the second amplifier is also electrically connected with after described high-precision signal path and described Rapid Signal Transduction Pathways, described second amplifier is connected with described divider resistance input end, the gain of described high-precision signal path is much larger than the gain of described Rapid Signal Transduction Pathways, the equivalent offset voltage making the offset voltage of described Rapid Signal Transduction Pathways self convert described Hall effect Sensitive Apparatus output terminal is approximately zero, described Rapid Signal Transduction Pathways cannot be passed through by the low frequency signal of described signal read circuit simultaneously, and the hall signal that the described Hall effect Sensitive Apparatus being modulated onto chopping frequency produces can by described Rapid Signal Transduction Pathways.
In general, the above technical scheme conceived by the present invention compared with prior art, owing to adding quick response signal path, can obtain following beneficial effect:
(1) adopt quick response signal path to manufacture a fast path thus transient signal to be measured also can need not be exported rapidly by low-pass filter;
(2) and carried out designing dexterously to the gain of high-precision signal path and quick response signal path, the existence of this alternate path is made not affect the reading accuracy of steady-state signal;
(3) fast transient response can be strengthened significantly, improve the response speed of real-time guard further.
Accompanying drawing explanation
Fig. 1 is the system architecture diagram of existing a kind of hall effect current sensor in prior art;
Fig. 2 is the system architecture diagram with the hall effect current sensor of response path fast realized according to the present invention;
Fig. 3 is the response signal oscillogram of the hall effect current sensor according to the present invention's realization.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Figure 2 shows that the system architecture diagram with the hall effect current sensor of fast transient response proposed by the invention.Main circuit of the present invention will comprise Hall effect Sensitive Apparatus, high-precision signal path, Rapid Signal Transduction Pathways and negative feedback loop.
High-precision signal path comprises the first low noise amplifier G that order is connected
1, the first chopper CH
1with low-pass filter LPF.
Rapid Signal Transduction Pathways comprises Hi-pass filter HPF, the 3rd chopper CH that order is connected
2with high speed amplifier G
3.
Wherein, Rapid Signal Transduction Pathways and high-precision signal path are relation in parallel, and meet the second low noise amplifier G after two paths in parallel
2.
Negative feedback loop comprises divider resistance R
1, R
2with the second chopper CH
fB, divider resistance R
1input and the second low noise amplifier G
2output connect.
Wherein, the signal transacting of above-mentioned sensing circuit is as follows: suppose that the output voltage that the Hall effect Sensitive Apparatus in hall effect current sensor is produced by magnetic field excitation B to be measured is V
h, the offset voltage of Hall effect Sensitive Apparatus self is V
oSH, the gain of high-precision signal path is A
1, the offset voltage of high-precision signal path self is V
oS1, the gain of Rapid Signal Transduction Pathways is A
2, the offset voltage of Rapid Signal Transduction Pathways self is V
oS2, chopping frequency is f
cH.
Under suitable dynamic driving, V
hbe one and be modulated onto f
cHhigh-frequency signal, V
oSHit is a direct current signal.The offset voltage V of Hall effect Sensitive Apparatus self
oSHwith the offset voltage V of high-precision signal path self
oS1by the first chopper CH
1be modulated to high frequency, and then be low-pass filtered device LPF filtering.The offset voltage V of Rapid Signal Transduction Pathways self
oS2the equivalent voltage converting Hall effect Sensitive Apparatus output terminal is V
oS2'=V
oS2* A
2/ A
1.A is made by suitable design
1much larger than A
2, V
oS2'be approximately zero: such as in one embodiment, make V
oS2=10mV, A
1=160dB, A
2=80dB, then have V
oS2'=1uV.Due to the existence of Hi-pass filter HPF, the offset voltage V of Hall effect Sensitive Apparatus self
oSHcannot Rapid Signal Transduction Pathways be passed through, and the V changed due to transient magnetic field change
hrapid Signal Transduction Pathways can be passed through.Fig. 3 is the effect diagram of the hall effect current sensor according to the present invention's realization, and dotted line is depicted as output waveform when only having high-precision signal path, and solid line is depicted as with output waveform during Rapid Signal Transduction Pathways.And from above-mentioned effect, Rapid Signal Transduction Pathways makes the transient state of sensor export quickly close to stable state output, can improve transient response speed significantly.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. one kind has the Hall current sensor of fast transient response, this sensor comprises the signal read circuit of Hall effect Sensitive Apparatus and described Hall effect Sensitive Apparatus, described signal read circuit comprises high-precision signal path and negative feedback loop thereof, described high-precision signal path comprises the first low noise amplifier of order electrical connection, first chopper and low-pass filter, described negative feedback loop comprises divider resistance, and be electrically connected the second chopper of described divider resistance point pressure side and described high-precision signal path input, it is characterized in that, described high-precision signal path two ends are parallel with Rapid Signal Transduction Pathways, described Rapid Signal Transduction Pathways comprises the Hi-pass filter of order electrical connection, 3rd chopper and the first amplifier, the second amplifier is also electrically connected with after described high-precision signal path and described Rapid Signal Transduction Pathways, described second amplifier is connected with described divider resistance input end, the gain of described high-precision signal path is much larger than the gain of described Rapid Signal Transduction Pathways, the equivalent offset voltage making the offset voltage of described Rapid Signal Transduction Pathways self convert described Hall effect Sensitive Apparatus output terminal is approximately zero, described Rapid Signal Transduction Pathways cannot be passed through by the low frequency signal of described signal read circuit simultaneously, and the hall signal that the described Hall effect Sensitive Apparatus being modulated onto chopping frequency produces can by described Rapid Signal Transduction Pathways.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610096975.8A CN105548662A (en) | 2016-02-23 | 2016-02-23 | Hall effect current sensor with rapid transient response function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610096975.8A CN105548662A (en) | 2016-02-23 | 2016-02-23 | Hall effect current sensor with rapid transient response function |
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| CN105548662A true CN105548662A (en) | 2016-05-04 |
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|---|---|---|---|
| CN201610096975.8A Pending CN105548662A (en) | 2016-02-23 | 2016-02-23 | Hall effect current sensor with rapid transient response function |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108270408A (en) * | 2018-04-28 | 2018-07-10 | 福州大学 | Low noise linear hall sensor reading circuit and its method of work |
| CN108418560A (en) * | 2018-03-30 | 2018-08-17 | 福州大学 | Readout Method Applied to Hall Current Sensor |
| CN113777387A (en) * | 2021-11-11 | 2021-12-10 | 武汉精熔潮电气科技有限公司 | Method for detecting steady-state transient current of conductor based on iron-core-free Hall and application thereof |
| CN115598395A (en) * | 2020-11-20 | 2023-01-13 | 苏州纳芯微电子股份有限公司（Cn） | Hall sensing circuit |
| CN117538590A (en) * | 2023-11-16 | 2024-02-09 | 浙江森尼克半导体有限公司 | Hall sensor circuit and electronic equipment |
| CN117538591A (en) * | 2024-01-09 | 2024-02-09 | 赛卓电子科技(上海)股份有限公司 | A method and circuit for reducing residual errors generated when Hall current rotates |
| CN118033209A (en) * | 2023-12-28 | 2024-05-14 | 南京邮电大学 | Dual-channel broadband Hall current sensor and implementation method |
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| CN205388619U (en) * | 2016-02-23 | 2016-07-20 | 武汉市聚芯微电子有限责任公司 | Hall effect current sensor with quick transient response |
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2016
- 2016-02-23 CN CN201610096975.8A patent/CN105548662A/en active Pending
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| DE10062292A1 (en) * | 2000-12-14 | 2002-03-07 | Infineon Technologies Ag | Magnetic field measurement arrangement, has low and high frequency measurement systems with the signals from the two circuits combined to give a broad bandwidth, low noise, low drift and fast response time circuit |
| US7425821B2 (en) * | 2006-10-19 | 2008-09-16 | Allegro Microsystems, Inc. | Chopped Hall effect sensor |
| CN103038658A (en) * | 2010-07-28 | 2013-04-10 | 阿莱戈微系统公司 | Magnetic field sensor with improved differentiation between a sensed magnetic field signal and a noise signal |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418560A (en) * | 2018-03-30 | 2018-08-17 | 福州大学 | Readout Method Applied to Hall Current Sensor |
| CN108418560B (en) * | 2018-03-30 | 2023-08-04 | 福州大学 | Readout circuit applied to Hall current sensor |
| CN108270408A (en) * | 2018-04-28 | 2018-07-10 | 福州大学 | Low noise linear hall sensor reading circuit and its method of work |
| CN108270408B (en) * | 2018-04-28 | 2023-06-23 | 福州大学 | Low-noise linear Hall sensor reading circuit and working method thereof |
| CN115598395A (en) * | 2020-11-20 | 2023-01-13 | 苏州纳芯微电子股份有限公司（Cn） | Hall sensing circuit |
| CN115598395B (en) * | 2020-11-20 | 2024-01-30 | 苏州纳芯微电子股份有限公司 | Hall sensing circuit |
| CN113777387A (en) * | 2021-11-11 | 2021-12-10 | 武汉精熔潮电气科技有限公司 | Method for detecting steady-state transient current of conductor based on iron-core-free Hall and application thereof |
| CN117538590A (en) * | 2023-11-16 | 2024-02-09 | 浙江森尼克半导体有限公司 | Hall sensor circuit and electronic equipment |
| CN118033209A (en) * | 2023-12-28 | 2024-05-14 | 南京邮电大学 | Dual-channel broadband Hall current sensor and implementation method |
| CN118033209B (en) * | 2023-12-28 | 2024-09-24 | 南京邮电大学 | Dual-channel broadband Hall current sensor and implementation method |
| CN117538591A (en) * | 2024-01-09 | 2024-02-09 | 赛卓电子科技(上海)股份有限公司 | A method and circuit for reducing residual errors generated when Hall current rotates |
| CN117538591B (en) * | 2024-01-09 | 2024-04-12 | 赛卓电子科技(上海)股份有限公司 | A method and circuit for reducing residual error generated when Hall current rotates |
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Application publication date: 20160504 |
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