CN112834812A - Hall current sensor chip with strong anti-interference capability - Google Patents
Hall current sensor chip with strong anti-interference capability Download PDFInfo
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- CN112834812A CN112834812A CN202110012021.5A CN202110012021A CN112834812A CN 112834812 A CN112834812 A CN 112834812A CN 202110012021 A CN202110012021 A CN 202110012021A CN 112834812 A CN112834812 A CN 112834812A
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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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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- Measurement Of Current Or Voltage (AREA)
Abstract
The invention belongs to the technical field of Hall sensor chips, and particularly relates to a Hall current sensor chip with strong anti-jamming capability, which comprises a current acquisition circuit and a chip control circuit electrically connected with the current acquisition circuit, wherein the current acquisition circuit comprises a low conductor resistor, a voltage stabilizing circuit, a Hall sensor, a preamplifier, a temperature compensation circuit, a sensitivity trimming circuit, a comparison circuit, a frequency oscillator, a rear amplifier, a thermal shutoff circuit and a voltage conditioning circuit, the Hall sensor is connected with the voltage stabilizing circuit, the low conductor resistor is positioned near the surface of the chip, the low conductor resistor generates a magnetic field which can be measured by the Hall sensor, and the Hall sensor senses the magnetic field and converts the magnetic field into an electric signal. The invention realizes the real-time monitoring of the sampling data, has strong anti-interference capability, low power consumption, high sensitivity and high precision, provides an overheat shutoff function, is stable and reliable, and ensures that the product is easy to use.
Description
Technical Field
The invention relates to the technical field of Hall sensor chips, in particular to a Hall current sensor chip with strong anti-interference capability.
Background
The Hall sensor is made by integrating Hall sensing elements, an amplifier, a compensating circuit and other electronic circuits on a chip by utilizing the Hall effect principle and utilizing the integrated circuit process technology, has the advantages of small volume, long service life, non-contact sensing, high frequency and the like, and is widely applied to the fields of automobile sensor modules, electronic instruments and industrial control.
The Hall sensor chip is an important member of a Hall sensor family, outputs an analog electrical signal which is in a linear relation with the magnetic field intensity according to the change of the magnetic field intensity of an external magnetic field, and is widely applied to the industrial control fields of detecting micro displacement, angle measurement, servo motor control, precise instruments and meters and the like. However, in the use process of the existing hall sensor chip, the output voltage signal has weak anti-interference capability, the defects of low precision and insufficient reliability exist, the communication mode is single, and the use requirement of high universality cannot be met.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the Hall current sensor chip with strong anti-jamming capability, and solves the problems that the anti-jamming capability of the output voltage signal of the existing Hall current sensor chip is weak, the precision is low, the reliability is insufficient, the communication mode is single, and the use requirement of high universality cannot be met in the use process of the existing Hall current sensor chip.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a Hall current sensor chip with strong anti-interference capability comprises a current acquisition circuit and a chip control circuit electrically connected with the current acquisition circuit, wherein the current acquisition circuit comprises a low conductor resistor, a voltage stabilizing circuit, a Hall sensor, a preamplifier, a temperature compensation circuit, a sensitivity trimming circuit, a comparison circuit, a frequency oscillator, a rear amplifier, a thermal shutoff circuit and a voltage conditioning circuit, the Hall sensor is connected with the voltage stabilizing circuit, the low conductor resistor is positioned near the surface of the chip and generates a magnetic field which can be measured by the Hall sensor, the Hall sensor senses the magnetic field and converts the magnetic field into an electric signal, the preamplifier is connected with the Hall sensor and is used for amplifying a voltage signal sensed by the Hall sensor, and the temperature compensation circuit and the sensitivity trimming circuit are respectively connected with the preamplifier, the temperature compensation circuit and the sensitivity trimming circuit are respectively used for performing temperature compensation and sensitivity trimming on an amplified voltage signal, the preamplifier is connected with the rear amplifier through the comparison circuit, the comparison circuit is used for comparing the amplified signal output by the preamplifier, eliminating offset voltage of the comparison circuit, outputting a comparison signal and transmitting the comparison signal to the rear amplifier, the frequency oscillator is connected with the comparison circuit and used for providing an alternating current signal with fixed frequency, the rear amplifier is used for performing secondary amplification on the voltage signal output by the comparison circuit, the thermal shutdown circuit and the voltage conditioning circuit are respectively connected with the rear amplifier, and the thermal shutdown circuit and the voltage conditioning circuit are respectively used for providing circuit overheating shutdown protection and offset voltage conditioning.
The chip control circuit is composed of a bias circuit, a single chip microcomputer circuit, an A/D conversion module, a timing module, an alarm module, a CAN bus interface, a CAN interface circuit and a wireless communication module, wherein the bias circuit is used for providing bias voltage and current for other circuits and modules in the chip control circuit, analog voltage signals output by the rear amplifier are converted by the A/D conversion module and then input digital voltage signals to the single chip microcomputer circuit, the timing module, the alarm module, the CAN bus interface and the wireless communication module are respectively and electrically connected with the single chip microcomputer circuit, the timing module is used for providing current value timing output signals to the single chip microcomputer circuit, the alarm module is used for outputting alarm signals when measured current values are abnormal, the CAN bus interface is connected with the CAN interface circuit, and the single chip microcomputer circuit analyzes and processes the digital voltage signals and then outputs alarm signals through the CAN bus interface, The CAN interface circuit outputs a current value to a superior level at regular time, and the wireless communication module is used for wireless remote transmission of sampling data.
In a preferred embodiment of the present invention, the low conductor resistance is a low-impedance copper conductive path.
As a preferred technical solution of the present invention, the current collection circuit includes four sensitivity options, including a 1: 50 mV/A; a2: 100 mV/A; a3: 200 mV/A; a4: 400 mV/A; the chip magnetic field sensitivity of the current acquisition circuit can work under a single power supply of 3V to 5.5V after the sensitivity of the chip magnetic field is adjusted to the target sensitivity through the sensitivity adjustment circuit.
As a preferable technical scheme of the invention, the frequency oscillator is a 52KHz fixed built-in frequency oscillator.
As a preferable technical scheme of the invention, the single chip microcomputer circuit adopts a single chip microcomputer with the model of MC9S12XS 128.
As a preferred technical scheme of the invention, the alarm module is an audible and visual alarm.
As a preferred technical solution of the present invention, the wireless communication module is a bluetooth module or a WIFI module.
(III) advantageous effects
Compared with the prior art, the invention provides the Hall current sensor chip with strong anti-interference capability, which has the following beneficial effects:
the Hall current sensor chip with strong anti-interference capability comprises a hardware circuit consisting of a current acquisition circuit and a chip control circuit, a magnetic field which CAN be measured by a Hall sensor is generated by a low conductor resistor, then the magnetic field is sensed by the Hall sensor and converted into an electric signal, the electric signal is processed by a signal processing circuit consisting of a preamplifier, a temperature compensation circuit, a sensitivity trimming circuit, a comparison circuit, a frequency oscillator, a rear amplifier, a heat shutoff circuit and a voltage conditioning circuit, proportional voltage is output, the chip control circuit performs analysis processing after A/D conversion, and the current value is transmitted to a superior control in a CAN bus transmission mode at regular time, so that the real-time monitoring of sampling data is realized Reliable, making the product easy to use.
Drawings
FIG. 1 is a schematic block diagram of the system of the present invention.
In the figure: 100. a current collection circuit; 101. a low conductor resistance; 102. a voltage stabilizing circuit; 103. a Hall sensor; 104. a preamplifier; 105. a temperature compensation circuit; 106. a sensitivity trimming circuit; 107. a comparison circuit; 108. a frequency oscillator; 109. a rear amplifier; 110. a thermal shutdown circuit; 111. a voltage conditioning circuit; 200. a chip control circuit; 201. a bias circuit; 202. a single chip circuit; 203. an A/D conversion module; 204. a timing module; 205. an alarm module; 206. a CAN bus interface; 207. a CAN interface circuit; 208. and a wireless communication module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1, the present invention provides the following technical solutions: a Hall current sensor chip with strong anti-interference capability comprises a current acquisition circuit 100 and a chip control circuit 200 electrically connected with the current acquisition circuit 100, wherein the current acquisition circuit 100 comprises a low conductor resistor 101, a voltage stabilizing circuit 102, a Hall sensor 103, a preamplifier 104, a temperature compensation circuit 105, a sensitivity trimming circuit 106, a comparison circuit 107, a frequency oscillator 108, a rear amplifier 109, a thermal shutdown circuit 110 and a voltage conditioning circuit 111, wherein the Hall sensor 103 is connected with the voltage stabilizing circuit 102, the low conductor resistor 101 is positioned near the surface of the chip, the low conductor resistor 101 generates a magnetic field which can be measured by the Hall sensor 103, the Hall sensor 103 senses the magnetic field and converts the magnetic field into an electric signal, the preamplifier 104 is connected with the Hall sensor 103, the preamplifier 104 is used for amplifying a voltage signal sensed by the Hall sensor 103, and the temperature compensation circuit 105 and the sensitivity trimming circuit 106 are respectively connected with the preamplifier 104, the temperature compensation circuit 105 and the sensitivity trimming circuit 106 are respectively used for performing temperature compensation and sensitivity trimming on the amplified voltage signal, the preamplifier 104 is connected with the post-amplifier 109 through the comparison circuit 107, the comparison circuit 107 is used for comparing the amplified signal output by the preamplifier 104, the offset voltage of the comparison circuit 107 is eliminated, the comparison signal is output and transmitted to the post-amplifier 109, the frequency oscillator 108 is connected with the comparison circuit 107, the frequency oscillator 108 is used for providing an alternating current signal with fixed frequency, the post-amplifier 109 is used for performing secondary amplification on the voltage signal output by the comparison circuit 107, the thermal shutdown circuit 110 and the voltage conditioning circuit 111 are respectively connected with the post-amplifier 109, and the thermal shutdown circuit 110 and the voltage conditioning circuit 111 are respectively used for providing circuit overheat shutdown protection and offset voltage conditioning.
The chip control circuit 200 is composed of a bias circuit 201, a single chip microcomputer circuit 202, an A/D conversion module 203, a timing module 204, an alarm module 205, a CAN bus interface 206, a CAN interface circuit 207 and a wireless communication module 208, wherein the bias circuit 201 is used for providing bias voltage and current for other circuits and modules in the chip control circuit 200, an analog voltage signal output by a rear amplifier 109 is converted by the A/D conversion module 203 and then inputs a digital voltage signal to the single chip microcomputer circuit 202, the timing module 204, the alarm module 205, the CAN bus interface 206 and the wireless communication module 208 are respectively electrically connected with the single chip microcomputer circuit 202, the timing module 204 is used for providing a current value timing output signal for the single chip microcomputer circuit 202, the alarm module 205 is used for outputting an alarm signal when a measured current value is abnormal, the CAN bus interface 206 is connected with the CAN interface circuit 207, the single chip microcomputer circuit 202 analyzes and processes the digital voltage signal and then passes through the CAN bus, The CAN interface circuit 207 outputs the current value to the upper level at regular time, and the wireless communication module 208 is used for wireless remote transmission of sampling data.
Specifically, the low conductor resistance 101 is a low-resistance copper conductive path.
In this embodiment, the low conductor resistance 101 generates a magnetic field that can be measured by the hall sensor 103, and this configuration eliminates the need for an external concentrator, thereby simplifying the design and minimizing power consumption and heat dissipation by the low conductor resistance 101.
Specifically, the current acquisition circuit 100 includes four sensitivity options, including a 1: 50 mV/A; a2: 100 mV/A; a3: 200 mV/A; a4: 400 mV/A; the chip magnetic field sensitivity of the current acquisition circuit 100 can work under a single power supply of 3V to 5.5V after being subjected to sensitivity adjustment to a target sensitivity by the sensitivity adjustment circuit 106.
Specifically, the frequency oscillator 108 is a 52KHz fixed built-in frequency oscillator.
Specifically, the single chip microcomputer circuit 202 adopts a single chip microcomputer with the model of MC9S12XS 128.
Specifically, the alarm module 205 is an audible and visual alarm.
In this embodiment, through the setting of the alarm module 205, when the detected current is abnormal, the alarm module 205 performs an audible and visual alarm in time.
Specifically, the wireless communication module 208 is a bluetooth module or a WIFI module.
The working principle and the using process of the invention are as follows: when the circuit works, the voltage stabilizing circuit 102 provides reference voltage for other circuits and modules in the current acquisition circuit 100, the low conductor resistor 101 generates a magnetic field which can be measured by the Hall sensor 103, the Hall sensor 103 senses the magnetic field and converts the magnetic field into an electric signal which is transmitted to the preamplifier 104 for amplification processing, the temperature compensation circuit 105 performs temperature compensation on the amplified voltage signal, meanwhile, the sensitivity of the magnetic field is adjusted to a target sensitivity by the sensitivity adjustment circuit 106 and then transmitted to the comparison circuit 107, the comparison circuit 107 compares the amplified signal output by the preamplifier 104 to eliminate offset voltage of the comparison circuit 107, the frequency oscillator 108 provides an alternating current signal with fixed frequency, then the electric signal is further amplified by the rear amplifier 109, the offset voltage is conditioned by the voltage conditioning circuit 111 and then transmitted to the singlechip circuit 202 through A/D conversion, the digital signal after A/D conversion is processed by the single chip circuit 202, the measured current value is output to the upper level at regular time according to the current value timing output signal provided by the timing module 204 in a CAN bus transmission mode, the upper level CAN be an upper computer, remote data monitoring is realized, when the measured current value is abnormal, the alarm module 205 gives an alarm to remind a worker to process the current value in time, local data CAN also be transmitted in a wireless data mode through the wireless communication module 208, and the wireless data transmission mode adopts a Bluetooth or WIFI wireless transmission mode.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a hall current sensor chip that interference killing feature is strong, includes current acquisition circuit (100) and with current acquisition circuit (100) electric connection's chip control circuit (200), its characterized in that: the current acquisition circuit (100) comprises a low conductor resistor (101), a voltage stabilizing circuit (102), a Hall sensor (103), a preamplifier (104), a temperature compensation circuit (105), a sensitivity trimming circuit (106), a comparison circuit (107), a frequency oscillator (108), a rear amplifier (109), a thermal shutdown circuit (110) and a voltage conditioning circuit (111), wherein the Hall sensor (103) is connected with the voltage stabilizing circuit (102), the low conductor resistor (101) is positioned near the surface of a chip, the low conductor resistor (101) generates a magnetic field which can be measured by the Hall sensor (103), the Hall sensor (103) senses the magnetic field and converts the magnetic field into an electric signal, the preamplifier (104) is connected with the Hall sensor (103), and the preamplifier (104) is used for amplifying a voltage signal sensed by the Hall sensor (103), the temperature compensation circuit (105) and the sensitivity trimming circuit (106) are respectively connected with the preamplifier (104), the temperature compensation circuit (105) and the sensitivity trimming circuit (106) are respectively used for carrying out temperature compensation and sensitivity trimming on amplified voltage signals, the preamplifier (104) is connected with the rear amplifier (109) through the comparison circuit (107), the comparison circuit (107) is used for comparing the amplified signals output by the preamplifier (104), eliminating offset voltage of the comparison circuit (107) per se, outputting comparison signals and transmitting the comparison signals to the rear amplifier (109), the frequency oscillator (108) is connected with the comparison circuit (107), the frequency oscillator (108) is used for providing alternating current signals with fixed frequency, and the rear amplifier (109) is used for carrying out secondary amplification on the voltage signals output by the comparison circuit (107), the thermal shutdown circuit (110) and the voltage conditioning circuit (111) are respectively connected with the rear amplifier (109), and the thermal shutdown circuit (110) and the voltage conditioning circuit (111) are respectively used for providing circuit overheating shutdown protection and offset voltage conditioning;
the chip control circuit (200) is composed of a bias circuit (201), a single chip microcomputer circuit (202), an A/D conversion module (203), a timing module (204), an alarm module (205), a CAN bus interface (206), a CAN interface circuit (207) and a wireless communication module (208), wherein the bias circuit (201) is used for providing bias voltage and current for other circuits and modules in the chip control circuit (200), analog voltage signals output by the rear amplifier (109) are converted by the A/D conversion module (203) and then input digital voltage signals to the single chip microcomputer circuit (202), the timing module (204), the alarm module (205), the CAN bus interface (206) and the wireless communication module (208) are respectively and electrically connected with the single chip microcomputer circuit (202), and the timing module (204) is used for providing current value timing output signals for the single chip microcomputer circuit (202), the alarm module (205) is used for outputting an alarm signal when the measured current value is abnormal, the CAN bus interface (206) is connected with the CAN interface circuit (207), the single chip microcomputer circuit (202) analyzes and processes the digital voltage signal and then outputs the current value to the upper level at regular time through the CAN bus interface (206) and the CAN interface circuit (207), and the wireless communication module (208) is used for wireless remote transmission of sampling data.
2. The hall current sensor chip with high interference rejection according to claim 1, wherein: the low conductor resistance (101) is a low impedance copper conductive circuit.
3. The hall current sensor chip with high interference rejection according to claim 1, wherein: the current acquisition circuit (100) includes four sensitivity options, including a 1: 50 mV/A; a2: 100 mV/A; a3: 200 mV/A; a4: 400 mV/A; the chip magnetic field sensitivity of the current acquisition circuit (100) can work under a single power supply of 3V to 5.5V after being subjected to sensitivity adjustment to the target sensitivity by the sensitivity adjustment circuit (106).
4. The hall current sensor chip with high interference rejection according to claim 1, wherein: the frequency oscillator (108) is a 52KHz fixed built-in frequency oscillator.
5. The hall current sensor chip with high interference rejection according to claim 1, wherein: the single chip microcomputer circuit (202) adopts a single chip microcomputer with the model number of MC9S12XS 128.
6. The hall current sensor chip with high interference rejection according to claim 1, wherein: the alarm module (205) is an audible and visual alarm.
7. The hall current sensor chip with high interference rejection according to claim 1, wherein: the wireless communication module (208) adopts a Bluetooth module or a WIFI module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110012021.5A CN112834812A (en) | 2021-01-06 | 2021-01-06 | Hall current sensor chip with strong anti-interference capability |
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| CN202110012021.5A CN112834812A (en) | 2021-01-06 | 2021-01-06 | Hall current sensor chip with strong anti-interference capability |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113411074A (en) * | 2021-07-13 | 2021-09-17 | 上海艾为电子技术股份有限公司 | Hall sensor switch and electronic equipment |
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| US20200300934A1 (en) * | 2019-03-18 | 2020-09-24 | Sigmasense, Llc. | Single line Hall effect sensor drive and sense |
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| WO1996028739A1 (en) * | 1995-03-16 | 1996-09-19 | Horstmann Timers & Controls Limited | Electricity measurement apparatus |
| CN101819228A (en) * | 2010-04-16 | 2010-09-01 | 上海交通大学 | Hall current sensor based current detection device |
| CN103308739A (en) * | 2012-03-07 | 2013-09-18 | 深圳市柏特瑞电子有限公司 | Network-type Hall direct current sensor |
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| CN113411074B (en) * | 2021-07-13 | 2022-11-15 | 上海艾为电子技术股份有限公司 | Hall sensor switch and electronic equipment |
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Application publication date: 20210525 |