CN112816921A - Current output type linear Hall sensor chip - Google Patents
Current output type linear Hall sensor chip Download PDFInfo
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- CN112816921A CN112816921A CN202110011348.0A CN202110011348A CN112816921A CN 112816921 A CN112816921 A CN 112816921A CN 202110011348 A CN202110011348 A CN 202110011348A CN 112816921 A CN112816921 A CN 112816921A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/07—Hall effect devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
Abstract
The invention belongs to the technical field of Hall sensor chips, and particularly relates to a current output type linear Hall sensor chip which comprises an internal circuit and a voltage control circuit which are connected, wherein the internal circuit comprises a voltage stabilizing circuit, a biasing circuit, a Hall disc, an amplifier, a comparison circuit, a reset circuit, an output module, a trimming circuit, a compensation circuit, a current limiting circuit and a thermal shutoff circuit, and the voltage stabilizing circuit is used for providing reference voltage for other circuits and modules in the internal circuit. The current output type linear Hall sensor chip with the internal circuit as the main body and the integrated voltage control circuit can repair offset voltage and compensate circuit gain and temperature in the process of inputting and outputting internal circuit signals, has the functions of limiting overcurrent and preventing the chip from being turned off due to overheating, effectively saves packaging cost, and simultaneously improves the precision of performance parameters of the Hall sensor chip and the product yield.
Description
Technical Field
The invention relates to the technical field of Hall sensor chips, in particular to a current output type linear Hall sensor chip.
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 linear Hall sensor chip is an important member of a Hall sensor family, outputs an analog electrical signal in a linear relation with the magnetic field strength according to the change of the magnetic field strength 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.
The conventional linear hall sensor chip has 3 ports, a power port, a ground port, and an output port. The power supply voltage is generally between 3V and 10V, when no magnetic field exists, the output voltage is half of the power supply voltage, namely VCC/2, and the output voltage linearly increases from VCC/2 to approach the highest power supply voltage along with the enhancement of the magnetic field of the S pole; as the N-pole increases, or the S-pole field decreases, the output voltage decreases linearly from VCC/2 to near ground. The traditional linear Hall sensor chip has the defects of weak output voltage signal anti-interference capability and narrow application range, and is low in precision and low in product yield.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a current output type linear Hall sensor chip, which solves the problems of weak output voltage signal anti-interference capability, narrow application range, low precision and low product yield of the traditional linear Hall sensor chip.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a current output type linear Hall sensor chip comprises an internal circuit and a voltage control circuit which are connected, wherein the internal circuit comprises a voltage stabilizing circuit, a bias circuit, a Hall disc, an amplifier, a comparison circuit, a reset circuit, an output module, a trimming circuit, a compensation circuit, a current limiting circuit and a thermal shutoff circuit, the voltage stabilizing circuit is used for providing reference voltage for other circuits and modules in the internal circuit, the Hall disc is connected with the output end of the bias circuit and connected with the amplifier, the Hall disc is used for sensing an external magnetic field and converting a magnetic field signal into an electric signal, the amplifier, the comparison circuit, the reset circuit and the output module are sequentially connected, the input end of the trimming circuit is connected with the output module, the output end of the trimming circuit is connected with the amplifier, and the output end of the compensation circuit is respectively connected with the bias circuit, the output end of the compensation circuit, the, The amplifier is connected with the current limiting circuit, the output end of the current limiting circuit is connected with the output module, and the output end of the thermal shutoff circuit is connected with the output end of the current limiting circuit.
As a preferred technical solution of the present invention, the comparison circuit is an offset cancellation comparison function circuit, and is configured to compare the amplified signal output by the amplifier, cancel an offset voltage of the comparison circuit itself, output a comparison signal, and transmit the comparison signal to the reset circuit.
As a preferred technical solution of the present invention, the trimming circuit is composed of a zero magnetic field output voltage trimming circuit and an offset voltage trimming circuit, an input end of the zero magnetic field output voltage trimming circuit is connected to the output module, an output end of the zero magnetic field output voltage trimming circuit is connected to an input end of the offset voltage trimming circuit, and an output end of the offset voltage trimming circuit is connected to the amplifier.
As a preferred embodiment of the present invention, the compensation circuit is used for performing voltage, current gain and temperature compensation on the bias circuit, the amplifier and the current limiting circuit.
As a preferred technical solution of the present invention, the voltage-controlled circuit includes a power interface, a ground interface, an input interface, and an output interface, the power interface is connected to the voltage-stabilizing circuit, the ground interface is connected to a ground terminal of the internal circuit, the input interface is connected to an output terminal of the output module, and the output interface is a current output terminal of the chip.
As a preferable aspect of the present invention, the thermal shutdown circuit is an overheat shutdown function circuit having a hysteresis function, and is configured to prevent the chip from overheating.
(III) advantageous effects
Compared with the prior art, the invention provides a current output type linear Hall sensor chip, which has the following beneficial effects:
this linear hall sensor chip of current output type takes internal circuit as the main part, and the linear hall sensor chip of current output type of integrated voltage control circuit can let in and the output process at internal circuit signal, revises offset voltage, carries out circuit gain and temperature compensation, has the restriction overcurrent and prevents the overheated turn-off function of chip, effectively saves the encapsulation cost, has improved hall sensor chip performance parameter's precision and product yield simultaneously.
Drawings
FIG. 1 is a schematic block diagram of a circuit connection structure of a current output type linear Hall sensor chip according to the present invention;
fig. 2 is a schematic block diagram of a circuit connection structure of an internal circuit in a current output type linear hall sensor chip according to the present invention.
In the figure: 1. an internal circuit; 101. a voltage stabilizing circuit; 102. a bias circuit; 103. a Hall plate; 104. an amplifier; 105. a comparison circuit; 106. a reset circuit; 107. an output module; 108. a trimming circuit; 109. a compensation circuit; 110. a current limiting circuit; 111. a thermal shutdown circuit; 2. a voltage control circuit.
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. 1-2, the present invention provides the following technical solutions: a current output type linear Hall sensor chip comprises an internal circuit 1 and a voltage-controlled circuit 2 which are connected, wherein the internal circuit 1 comprises a voltage stabilizing circuit 101, a bias circuit 102, a Hall disc 103, an amplifier 104, a comparison circuit 105, a reset circuit 106, an output module 107, a trimming circuit 108, a compensation circuit 109, a current limiting circuit 110 and a thermal shutdown circuit 111, the voltage stabilizing circuit 101 is used for providing reference voltage for other circuits and modules in the internal circuit 1, the Hall disc 103 is connected with the output end of the bias circuit 102, the Hall disc 103 is connected with the amplifier 104, the Hall disc 103 is used for sensing an external magnetic field and converting a magnetic field signal into an electric signal, the amplifier 104, the comparison circuit 105, the reset circuit 106 and the output module 107 are sequentially connected, the input end of the trimming circuit 108 is connected with the output module 107, the output end of the trimming circuit 108 is connected with the amplifier 104, and the output end of the compensation circuit 109 is respectively connected with, The amplifier 104 is connected to the current limiting circuit 110, the output terminal of the current limiting circuit 110 is connected to the output block 107, and the output terminal of the thermal shutdown circuit 111 is connected to the output terminal of the current limiting circuit 110.
Specifically, the comparison circuit 105 is an offset cancellation comparison function circuit, and is configured to compare the amplified signal output by the amplifier 104, cancel the offset voltage of the comparison circuit 105 itself, output a comparison signal, and transmit the comparison signal to the reset circuit 106.
Specifically, the trimming circuit 108 is composed of a zero magnetic field output voltage trimming circuit and an offset voltage trimming circuit, an input end of the zero magnetic field output voltage trimming circuit is connected with the output module 107, an output end of the zero magnetic field output voltage trimming circuit is connected with an input end of the offset voltage trimming circuit, and an output end of the offset voltage trimming circuit is connected with the amplifier 104.
Specifically, the compensation circuit 109 is used for voltage, current gain and temperature compensation of the bias circuit 102, the amplifier 104 and the current limiting circuit 110.
In this embodiment, the compensation circuit 109 is a voltage/current/temperature compensation function circuit, and performs circuit gain and temperature compensation on the bias circuit 102, the amplifier 104, and the current limiting circuit 110.
Specifically, the voltage-controlled circuit 2 includes a power interface, a ground interface, an input interface, and an output interface, the power interface is connected to the voltage-stabilizing circuit 101, the ground interface is connected to the ground terminal of the internal circuit 1, the input interface is connected to the output terminal of the output module 107, and the output interface is the current output terminal of the chip.
In this embodiment, the voltage-controlled circuit 2 adopts the prior art and includes an amplifying circuit (second amplifier) and a MOS transistor NM1, a positive terminal of the amplifying circuit is connected to an output pin Vout of the internal circuit 1, an output terminal of the amplifying circuit is connected to a gate of the MOS transistor NM1, a source terminal of the MOS transistor NM1 is connected to a ground level through a resistor R1 and is connected to a negative terminal of the amplifier 104, and specifically, reference may be made to a current output type linear hall sensor disclosed in chinese patent CN 201310165845.1.
Specifically, the thermal shutdown circuit 111 is an overheat shutdown function circuit having a hysteresis function for preventing the chip from overheating.
The working principle and the using process of the invention are as follows: the current output type linear Hall sensor chip is integrated by an internal circuit 1 and a voltage control circuit 2, the internal circuit 1 is used as a chip main body circuit, a voltage stabilizing circuit 101 is used for providing reference voltage for other modules and circuits of the internal circuit 1 of the chip, the output of a bias circuit 102 is connected with a Hall disc 103 for providing bias voltage and current for the Hall disc 103, an external magnetic field is induced by the Hall disc 103, a magnetic field signal is converted into an electric signal, the magnetic signal is converted into the electric signal by a rotating current method and is input into an amplifier 104, the amplifier 104 amplifies the electric signal to gain and then inputs the amplified electric signal into a comparison circuit 105, the amplified electric signal is compared with a preset threshold value by comparing the amplified signal output by the amplifier 104 and eliminates offset voltage of the comparison circuit 105, the comparison signal is output to a reset circuit 106, and the comparison signal is output to an output module 107 by the reset, the output module 107 transmits the output signal to the trimming circuit 108, the trimming circuit 108 trims the output voltage and transmits the output voltage to the amplifier 104, the compensation circuit 109 compensates the bias circuit 102, the amplifier 104 and the current limiting circuit 110 for voltage, current gain and temperature in the process that the internal circuit 1 is connected with current and outputs the current, the current limiting circuit 110 limits overcurrent, and the thermal shutdown circuit 111 prevents the chip from overheating; the electric signal after signal amplification, circuit gain, temperature compensation and output voltage trimming is finally output to the voltage-controlled circuit 2 through the output module 107, namely, the output electric signal is transmitted to the second amplifier, and the voltage signal generated on the magnetic field sensing element Hall disk 103 is converted into a current signal through the second amplifier and the MOS tube NM1 in sequence, so that the output current or the power current of the chip is in a linear relation with the magnetic field intensity of the magnetic field applied on the chip, the packaging cost can be saved, and the precision of the performance parameters of the Hall sensor chip and the product yield are improved.
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 (6)
1. The utility model provides a linear hall sensor chip of current output type, includes inner circuit (1) and voltage-controlled circuit (2) that link to each other the setting, its characterized in that: the internal circuit (1) comprises a voltage stabilizing circuit (101), a bias circuit (102), a Hall disc (103), an amplifier (104), a comparison circuit (105), a reset circuit (106), an output module (107), a trimming circuit (108), a compensation circuit (109), a current limiting circuit (110) and a thermal shutoff circuit (111), wherein the voltage stabilizing circuit (101) is used for providing reference voltage for other circuits and modules in the internal circuit (1), the Hall disc (103) is connected with the output end of the bias circuit (102), the Hall disc (103) is connected with the amplifier (104), the Hall disc (103) is used for sensing an external magnetic field and converting a magnetic field signal into an electric signal, the amplifier (104), the comparison circuit (105), the reset circuit (106) and the output module (107) are sequentially connected, and the input end of the trimming circuit (108) is connected with the output module (107), the output end of the trimming circuit (108) is connected with the amplifier (104), the output end of the compensation circuit (109) is respectively connected with the bias circuit (102), the amplifier (104) and the current limiting circuit (110), the output end of the current limiting circuit (110) is connected with the output module (107), and the output end of the thermal shutdown circuit (111) is connected with the output end of the current limiting circuit (110).
2. A current output type linear hall sensor chip according to claim 1, wherein: the comparison circuit (105) is an offset elimination comparison function circuit and is used for comparing the amplified signals output by the amplifier (104), eliminating the offset voltage of the comparison circuit (105), outputting a comparison signal and transmitting the comparison signal to the reset circuit (106).
3. A current output type linear hall sensor chip according to claim 1, wherein: the trimming circuit (108) is composed of a zero magnetic field output voltage trimming circuit and an offset voltage trimming circuit, the input end of the zero magnetic field output voltage trimming circuit is connected with the output module (107), the output end of the zero magnetic field output voltage trimming circuit is connected with the input end of the offset voltage trimming circuit, and the output end of the offset voltage trimming circuit is connected with the amplifier (104).
4. A current output type linear hall sensor chip according to claim 1, wherein: the compensation circuit (109) is used for performing voltage, current gain and temperature compensation on the bias circuit (102), the amplifier (104) and the current limiting circuit (110).
5. A current output type linear hall sensor chip according to claim 1, wherein: the voltage control circuit (2) comprises a power interface, a grounding interface, an input interface and an output interface, wherein the power interface is connected with the voltage stabilizing circuit (101), the grounding interface is connected with the grounding end of the internal circuit (1), the input interface is connected with the output end of the output module (107), and the output interface is the current output end of the chip.
6. A current output type linear hall sensor chip according to claim 1, wherein: the thermal shutdown circuit (111) is an overheating shutdown function circuit with a hysteresis function, and is used for preventing the chip from overheating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110011348.0A CN112816921A (en) | 2021-01-06 | 2021-01-06 | Current output type linear Hall sensor chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110011348.0A CN112816921A (en) | 2021-01-06 | 2021-01-06 | Current output type linear Hall sensor chip |
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| Publication Number | Publication Date |
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| CN112816921A true CN112816921A (en) | 2021-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110011348.0A Pending CN112816921A (en) | 2021-01-06 | 2021-01-06 | Current output type linear Hall sensor chip |
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| CN (1) | CN112816921A (en) |
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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| CN103308075A (en) * | 2013-05-07 | 2013-09-18 | 赛卓电子科技（上海）有限公司 | Current output-type linear hall-effect sensor |
| CN106153084A (en) * | 2016-08-24 | 2016-11-23 | 成都芯进电子有限公司 | A kind of magnetic sensitivity temperature-compensation circuit and proframmable linear Hall sensor chip |
| CN206099929U (en) * | 2016-08-30 | 2017-04-12 | 厦门安斯通微电子技术有限公司 | Adopt off -set voltage to eliminate hall sensor of hysteresis comparison circuit |
| CN107483036A (en) * | 2016-06-07 | 2017-12-15 | 无锡麟力科技有限公司 | A kind of Hall switch offset voltage removing method |
| CN110488082A (en) * | 2019-07-12 | 2019-11-22 | 宁波中车时代传感技术有限公司 | A kind of measure voltage & current chip of integrated numeral output |
| CN111398878A (en) * | 2020-06-04 | 2020-07-10 | 宁波中车时代传感技术有限公司 | Hall programmable chip with ripple suppression function |
| CN111551878A (en) * | 2020-05-25 | 2020-08-18 | 南京邮电大学 | Hall sensor temperature drift compensation circuit |
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2021
- 2021-01-06 CN CN202110011348.0A patent/CN112816921A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308075A (en) * | 2013-05-07 | 2013-09-18 | 赛卓电子科技（上海）有限公司 | Current output-type linear hall-effect sensor |
| CN107483036A (en) * | 2016-06-07 | 2017-12-15 | 无锡麟力科技有限公司 | A kind of Hall switch offset voltage removing method |
| CN106153084A (en) * | 2016-08-24 | 2016-11-23 | 成都芯进电子有限公司 | A kind of magnetic sensitivity temperature-compensation circuit and proframmable linear Hall sensor chip |
| CN206099929U (en) * | 2016-08-30 | 2017-04-12 | 厦门安斯通微电子技术有限公司 | Adopt off -set voltage to eliminate hall sensor of hysteresis comparison circuit |
| CN110488082A (en) * | 2019-07-12 | 2019-11-22 | 宁波中车时代传感技术有限公司 | A kind of measure voltage & current chip of integrated numeral output |
| CN111551878A (en) * | 2020-05-25 | 2020-08-18 | 南京邮电大学 | Hall sensor temperature drift compensation circuit |
| CN111398878A (en) * | 2020-06-04 | 2020-07-10 | 宁波中车时代传感技术有限公司 | Hall programmable chip with ripple suppression function |
Cited By (2)
| 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 |
| 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: 20210518 |