CN107340488B - Multi-point multi-carrier correction system and correction method - Google Patents
Multi-point multi-carrier correction system and correction method Download PDFInfo
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- CN107340488B CN107340488B CN201710626801.2A CN201710626801A CN107340488B CN 107340488 B CN107340488 B CN 107340488B CN 201710626801 A CN201710626801 A CN 201710626801A CN 107340488 B CN107340488 B CN 107340488B
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- 238000001514 detection method Methods 0.000 claims description 20
- 239000004020 conductor Substances 0.000 description 6
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- 230000005355 Hall effect Effects 0.000 description 1
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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
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Abstract
The invention relates to the field of multi-carrier correction, in particular to a multi-carrier correction system and a correction method, which can conveniently realize continuous time correction of a Hall sensor and improve sensing precision.
Description
Technical Field
The invention relates to the field of multi-carrier correction, in particular to a multi-point multi-carrier correction system and a multi-point multi-carrier correction method.
Background
The hall effect defines the relationship between a magnetic field and an induced voltage, and when a current is passed through a conductor in the magnetic field, the magnetic field generates a force on electrons in the conductor perpendicular to the direction of electron movement, thereby generating a potential difference in two directions perpendicular to the conductor and the magnetic induction line. The hall sensor converts the magnetic field change into an electric signal for output, and can be used for detecting the current intensity in a nearby conductor.
Because the current sensor cannot distinguish the external environment magnetic field from the magnetic field generated by the current in the specific conductor based on the magnetic field detection, a plurality of Hall sensors are generally adopted for simultaneous detection, and then the environment magnetic field is restrained through a specific algorithm, so that the magnetic field intensity generated by the more accurate current is obtained. Meanwhile, since the accuracy of the hall sensor is easily exposed to the external environment, such as: the continuous time correction of the Hall device becomes the best scheme for improving the sensing precision of the current sensor due to the influences of temperature, packaging stress and the like.
The conventional hall sensor continuous time correction structure is shown in fig. 1, wherein 100 is a chip built-in coil which can be used for generating a magnetic field with standard amplitude; 101 is a magnetic field to be measured caused by external current; 102. 103 are two hall sensors with identical geometric dimensions; 104 and 105 are two analog signal amplifiers with identical amplification factors; 106 is a signal processor, which can work in an analog mode or a digital mode, and has the functions of measuring the analog signal induced by the standard amplitude magnetic field 102 generated by the 100, and comparing and processing the analog signal with the standard signal stored in advance. Thereby obtaining a correction signal; and then the correction is performed on 103, so that a current sensor with higher accuracy is obtained. Meanwhile, due to the fact that parallel channels are used, the correction method can be carried out simultaneously with detection of the magnetic field to be detected, namely: continuous time correction can be ensured.
It can be shown that the above correction method can be effectively implemented on the premise that:
102. 103 are two identical Hall sensors, and the same induction signal output can be generated when the same magnetic field is excited;
external environmental factors such as: the effects of temperature, humidity and package stress on 102, 103 are completely consistent;
104. the amplification factors of 105 are not different;
in practice, however, in current sensors, it is often necessary for two or more hall sensors to measure the magnetic field induced by the live conductor, so that the ambient magnetic field can be suppressed algorithmically. In this case, the precondition for the above conventional correction method is no longer satisfied because the pitch of the hall sensors is large.
Disclosure of Invention
Aiming at the problems that continuous time correction cannot be realized and the sensing precision is low, the invention provides a multi-point multi-carrier correction system and a multi-point multi-carrier correction method, which can conveniently realize continuous time correction of a Hall sensor and improve the sensing precision.
The technical scheme is as follows: the multi-point multi-carrier correction system comprises excitation coils, hall sensors and a signal processor, wherein the Hall sensors sense excitation signals of the excitation coils, the number of the excitation coils and the number of the Hall sensors are N, N is an integer larger than or equal to 2, the excitation coils are in one-to-one correspondence with the Hall sensors, the output ends of all the Hall sensors are respectively connected with one input end of an analog amplifier, the output ends of the analog amplifiers are connected with the signal processor, the signal processor outputs detection signals and correction signals, the correction signals are transmitted to the corresponding Hall sensors for correction, the detection signals are final output signals, the excitation signals generated by each excitation coil are signals with standard amplitude after square wave modulation, the frequencies are different, and the response of the internal excitation signals and the response of magnetic fields to be detected of each Hall sensor are distributed on different frequency bands.
It is further characterized in that the analog amplifier comprises an adder/subtractor and an amplifier;
the signal processor comprises N demodulators, N+1 filters and a signal correction module, and each Hall sensor corresponds to one demodulator and one filter respectively.
A method for multi-point multi-carrier correction, comprising the steps of:
(1) N Hall sensors are in one-to-one correspondence with N excitation coils, excitation signals are respectively induced, N is an integer greater than or equal to 2, the excitation signals generated by each excitation coil are signals obtained by square wave modulation of direct current signals with standard amplitude, the frequencies are different, and the response of the internal excitation signals of each Hall sensor and the response of a magnetic field to be detected are distributed on different frequency bands;
(2) All excitation signals sensed in the step (1) are sent to an analog amplifier for operation processing to obtain amplified signals;
(3) And (3) sending the amplified signal in the step (2) to a signal processor for processing to obtain a detection signal and a correction signal, sending the correction signal to a corresponding Hall sensor for correction, and taking the detection signal as a final output signal.
The method is further characterized in that the operation processing in the analog amplifier in the step (2) comprises amplifying all excitation signals after being processed by an adder or amplifying all excitation signals after being processed by a subtracter;
the signal processor in the step (3) demodulates the excitation signal in the amplified signal in the step (2) and then obtains a correction signal through the filter and the signal correction module, and the response of the magnetic field to be detected in the amplified signal directly passes through the filter and the signal processing module to obtain a detection signal.
After the correction system and the correction method are adopted, the internal excitation signal response and the magnetic field response to be detected of each Hall sensor are distributed on different frequency bands, so that the state of the Hall sensor can be continuously monitored, all standard excitation signal responses and external signal responses to be detected are amplified by adopting one analog amplifier, errors caused by the amplification factor difference of different amplifiers are eliminated, the sensing precision is improved, and meanwhile, the complexity and the area of a circuit are greatly reduced.
Drawings
FIG. 1 is a schematic block diagram of the prior art;
FIG. 2 is a schematic block diagram of the present invention;
FIG. 3 is a frequency distribution diagram;
fig. 4 is a schematic block diagram of the interior of a signal processor.
Detailed Description
The following is specifically exemplified:
referring to fig. 2 to 4, a multi-point multi-carrier correction system includes three exciting coils 201, 202, 203, three hall sensors 204, 205, 206 and a signal processor 210, wherein the hall sensors 204, 205, 206 respectively sense exciting signals of the exciting coils 201, 202, 203, the exciting coils 201, 202, 203 are in one-to-one correspondence with the hall sensors 204, 205, 206, output ends of the hall sensors 204, 205, 206 are respectively connected with one input end of an analog amplifier 207, output ends of the analog amplifier 207 are connected with the signal processor 210, the signal processor 210 outputs a detection signal 211 and a correction signal, the correction signal is respectively sent to the corresponding hall sensors for correction, the detection signal 211 is a final output signal,the excitation signal generated by each excitation coil is a signal obtained by modulating a direct current signal with standard amplitude by a square wave, the frequencies are different, and the internal excitation signal response and the magnetic field response to be measured of each Hall sensor are distributed on different frequency bands. The analog amplifier comprises a combination of an adder and an amplifier or a combination of a subtracter and an amplifier, and the analog amplifier can be selected according to practical requirements. The signal processor 210 includes three demodulators, four filters, and a signal correction module, one for each hall sensor. The exciting coil 201 has a frequency f 1 The exciting coil 202 corresponds to a frequency f 2 The exciting coil 203 has a corresponding frequency f N These frequencies are different from each other, and the following schemes can be selected: f (f) 2 =2*f1，f N =N*f 1 And so on, with reference to fig. 3, the internal excitation signal response of each hall device is thus distributed over different frequency bands. Likewise, the response of each hall device to the magnetic field to be measured is distributed at low frequencies (modulation to other frequencies is also possible). The above signals are isolated from each other in the frequency domain and can be processed by the same analog amplifier 207
A method of multi-point multi-carrier correction comprising the steps of:
(1) N Hall sensors are in one-to-one correspondence with N excitation coils, excitation signals are respectively induced, N is an integer greater than or equal to 2, the excitation signals generated by each excitation coil are signals obtained by square wave modulation of direct current signals with standard amplitude, the frequencies are different, and the response of the internal excitation signals of each Hall sensor and the response of a magnetic field to be detected are distributed on different frequency bands;
(2) All excitation signals sensed in the step (1) are sent to an analog amplifier for operation processing to obtain amplified signals;
(3) And (3) sending the amplified signal in the step (2) to a signal processor for processing to obtain a detection signal and a correction signal, sending the correction signal to a corresponding Hall sensor for correction, and taking the detection signal as a final output signal.
The operation processing in the analog amplifier in the step (2) comprises amplifying all excitation signals after being processed by an adder or amplifying all excitation signals after being processed by a subtracter;
the signal processor in the step (3) demodulates the excitation signal in the amplified signal in the step (2) and then obtains a correction signal through the filter and the signal correction module, and the direct current signal in the amplified signal directly passes through the filter and the signal correction module to obtain a detection signal.
As shown in fig. 4, the internal functional block diagram of the signal processor 210 may be an analog or digital one, and this embodiment is an analog one. The signals processed by the analog amplifier 207 are demodulated by a series of demodulators f1 to fN into respective excitation signal responses (corresponding to the excitation coils 201, 202, 203), the excitation response signals are compared with stored standard excitation signal responses, so that errors on the paths of the hall sensors at the current moment are given, correction signals are generated by a correction algorithm, and the excitation coils 201, 202, 203 are corrected respectively. The magnetic field response to be measured is separated by simple low-pass filtering to directly output the detection signal 211.
Claims (3)
1. The multi-point multi-carrier correction system comprises excitation coils, hall sensors and a signal processor, wherein the Hall sensors sense excitation signals of the excitation coils, the number of the excitation coils and the number of the Hall sensors are N, N is an integer larger than or equal to 2, the excitation coils are in one-to-one correspondence with the Hall sensors, the output ends of all the Hall sensors are respectively connected with one input end of an analog amplifier, the output ends of the analog amplifiers are connected with the signal processor, the signal processor outputs detection signals and correction signals, the correction signals are transmitted to the corresponding Hall sensors for correction, the detection signals are final output signals, the excitation signals generated by each excitation coil are signals with standard amplitude after square wave modulation, the frequencies are different, and the response of the internal excitation signals and the response of a magnetic field to be detected of each Hall sensor are distributed on different frequency bands; the signal processor comprises N demodulators, N+1 filters and a signal correction module, each Hall sensor corresponds to one demodulator and one filter respectively, excitation signals in amplified signals output by the analog amplifier are demodulated and then corrected by the filter and the signal correction module, and magnetic field response to be detected in the amplified signals is directly detected by the filter and the signal correction module to obtain detection signals.
2. A multi-point, multi-carrier correction system as set forth in claim 1 wherein said analog amplifier comprises an add/subtractor and an amplifier.
3. A method for multi-point multi-carrier correction, comprising the steps of:
(1) N Hall sensors are in one-to-one correspondence with N excitation coils, excitation signals are respectively induced, N is an integer greater than or equal to 2, the excitation signals generated by each excitation coil are signals obtained by square wave modulation of direct current signals with standard amplitude, the frequencies are different, and the response of the internal excitation signals of each Hall sensor and the response of a magnetic field to be detected are distributed on different frequency bands;
(2) All excitation signals sensed in the step (1) are sent to an analog amplifier for operation processing to obtain amplified signals; the operation processing in the analog amplifier comprises amplifying all excitation signals after being processed by an adder or amplifying all excitation signals after being processed by a subtracter;
(3) The amplified signals in the step (2) are sent to a signal processor for processing to obtain detection signals and correction signals, the signal processor demodulates excitation signals in the amplified signals in the step (2) and then obtains correction signals through a filter and a signal correction module, the detection signals are obtained by directly passing through the filter and the signal correction module in response to magnetic fields to be detected in the amplified signals, the correction signals are sent to corresponding Hall sensors for correction, and the detection signals are final output signals.
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| US10698066B2 (en) | 2018-04-13 | 2020-06-30 | Texas Instruments Incorporated | Calibration of hall device sensitivity using an auxiliary hall device |
| CN110058314A (en) * | 2019-05-28 | 2019-07-26 | 中国科学院微电子研究所 | Signal supervisory instrument and system |
| CN112986889A (en) * | 2020-12-08 | 2021-06-18 | 浙江武义电气安装工程有限公司 | System and method for checking current transformer for distribution network |
| CN112985246B (en) * | 2021-01-25 | 2023-03-31 | 成都芯源系统有限公司 | Position sensing system and position sensing method |
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| CN101023367A (en) * | 2004-09-16 | 2007-08-22 | 机电联合股份有限公司 | Continuously calibrated magnetic field sensor |
| CN102445671A (en) * | 2010-10-13 | 2012-05-09 | 北京中科信电子装备有限公司 | Hall device error compensation circuit |
| CN106768282A (en) * | 2017-03-14 | 2017-05-31 | 匙庆磊 | A kind of field calibration system for magnetoelectric sensor |
| CN207037057U (en) * | 2017-07-28 | 2018-02-23 | 无锡思泰迪半导体有限公司 | A kind of multiple spot multicarrier corrects system |
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| CN1705862A (en) * | 2002-10-16 | 2005-12-07 | Tt电子科技有限公司 | Sensing apparatus and method |
| CN101023367A (en) * | 2004-09-16 | 2007-08-22 | 机电联合股份有限公司 | Continuously calibrated magnetic field sensor |
| CN102445671A (en) * | 2010-10-13 | 2012-05-09 | 北京中科信电子装备有限公司 | Hall device error compensation circuit |
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