CN209841948U - Adjustable Hall voltage sensor - Google Patents
Adjustable Hall voltage sensor Download PDFInfo
- Publication number
- CN209841948U CN209841948U CN201920220069.3U CN201920220069U CN209841948U CN 209841948 U CN209841948 U CN 209841948U CN 201920220069 U CN201920220069 U CN 201920220069U CN 209841948 U CN209841948 U CN 209841948U
- Authority
- CN
- China
- Prior art keywords
- adjustable
- circuit
- triode
- resistor
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measuring Magnetic Variables (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model discloses a hall voltage sensor with adjustable, including direct current voltage input circuit, hall element, working current circuit, vice limit electric current forming circuit, adjustable proportion circuit, voltage input circuit is used for being passed the voltage conversion and being primary side current, primary side current passes through primary side coil forms primary side magnetic field, hall element includes primary side coil and vice limit coil, the working current circuit is used for providing working current, vice limit electric current forming circuit is used for enlargiing hall voltage and converts into vice limit electric current, vice limit electric current passes through vice limit coil forms vice limit magnetic field, adjustable proportion circuit is used for adjusting the conveying proportion, makes output voltage adjustable, the utility model provides an adjustable hall voltage sensor has that sensing precision is high, the continuous adjustable characteristics of conveying proportion.
Description
Technical Field
The utility model relates to a sensor, concretely relates to hall voltage sensor with adjustable.
Background
At present, there are two types of sensors for dc voltage isolation at home and abroad, one type is a photoelectric sensor based on photoelectric effect, and the sensor has high sensing precision and good linearity under the condition of constant ambient temperature, but when the ambient temperature changes, the dark current and the photocurrent of the photosensitive device change along with the change of the temperature, so that only dc isolation can be realized, and the purpose of high-precision isolated transmission and detection of dc voltage is difficult to achieve. The other type is a Hall voltage sensor which has the characteristics of high sensing precision, good linearity, small temperature drift and the like, and the magnetic balance principle based on the Hall effect has the following characteristics: firstly, because the magnetic balance principle can make output current reflect the primary side current value accurately, and output voltage can reflect the voltage value of primary side accurately, so the sensor developed by adopting the principle can have the characteristics of high sensing precision and good linearity theoretically, and secondly, the output and the input are highly isolated, thereby being very favorable for electric isolation.
In a modern system for monitoring 4 remote (remote control, remote regulation, remote signaling and remote measurement) by using a computer, an industrial personal computer and controlled equipment in the monitoring system need to be electrically isolated and detected so as to ensure that the industrial personal computer can safely and reliably run. Wherein the dc voltage isolation detection is usually implemented by a hall voltage sensor. The Hall voltage sensor has high sensing precision, good linearity and small temperature drift, and the sensing precision and the linearity change are very small in the temperature range of minus 40 ℃ to 75 ℃. Therefore, the method is widely applied to the isolation detection and isolation monitoring technology. However, the detection system of the industrial personal computer has a large number of detected voltages, different voltage values and even a large difference, so that the industrial personal computer has a certain requirement on the input voltage range, and in this case, if the ratio (transmission ratio) of the output voltage of the sensor to the input voltage is fixed, the output voltage of the sensor cannot meet the requirement of the industrial personal computer on the input voltage under some conditions (too high or too low voltage). In order to meet the requirement of the industrial personal computer on the input voltage, the output voltage of the sensor only needs to be reprocessed, and the precision is often reduced by the reprocessing.
Disclosure of Invention
The invention aims to solve the problems that the transmission proportion of the voltage detected by a Hall voltage sensor in the prior art is fixed, when the voltage to be detected by a detection system is more and different in voltage value, the output voltage of the sensor needs to be reprocessed, and the processing often reduces the test precision, so the utility model provides an adjustable Hall voltage sensor which has the characteristics of high sensing precision and continuously adjustable transmission proportion.
The utility model provides a technical scheme as follows:
adjustable hall voltage sensor includes:
the direct-current voltage input circuit is used for converting the transmitted voltage into primary current, and the primary current forms a primary magnetic field through the primary coil;
hall element N3The Hall element N3Comprises a primary coil and a secondary coil;
the working current circuit is used for providing working current;
the secondary side current forming circuit is used for amplifying the Hall voltage and converting the Hall voltage into secondary side current, and the secondary side current forms a secondary side magnetic field through the secondary side coil;
the adjustable proportion circuit is used for adjusting the transmission proportion to enable the output voltage to be adjustable.
Further, the adjustable proportion circuit at least comprises an adjustable resistor R01。
Further, the adjustable proportion circuit comprises a resistor R02And an adjustable resistance R01Resistance R02One end of the resistor R is connected with the secondary side voltage output end02The other end of the resistor is grounded, and an adjustable resistor R is connected with the ground01Is connected in series with the voltage output end and the resistor R02In the meantime.
Further, the working current circuit comprises a resistor R4Positive power supply, resistor R5Negative power supply, Hall element N31 pin of (2) through the resistor R4Connecting the positive power supply to Hall element N33 pin resistance R5A negative power supply is connected.
Furthermore, the working current circuit further comprises a filter capacitor C3Said filter capacitor C3The positive electrode of the filter capacitor C is connected with a positive power supply3The negative electrode of the negative electrode is connected with a negative power supply.
Further, the adjustable hall voltage sensor also comprises an offset elimination circuit for eliminating the additional voltage.
Further, the offset cancellation circuit comprises an operational amplifier N1Resistance R1Resistance R2The operational amplifier N1End b-cp1 of1Connecting an operational amplifier N1End cp2 of the operational amplifier N1The iput2 end is connected with a resistor R1Connecting Hall element N3Pin 2 of (1), the operational amplifier N1The iput1 end is connected with a resistor R2Connecting Hall element N34 of the operational amplifier N, the operational amplifier N1The vout terminal outputs the processed signal to the secondary side current forming circuit.
Further, the secondary side current forming circuit comprises a first triode Q1And a second triode Q2The first triode Q1The collector of the first triode Q is connected with the output end of the offset elimination circuit1The base of the first triode Q is connected with a positive power supply1The emitter of the first triode is connected with the second triode Q2Collector electrode of the second triode Q2The emitter of the second triode Q is connected with the output end of the offset eliminating circuit2The base of the second triode Q is connected with a negative power supply2The collector of which is connected with the signal output terminal.
Further, the secondary side current forming circuit further comprises a first switching diode D1And a second switching diode D2A first switching diode D1Anode of the first triode is connected with a second triode Q2The base of (D), the first switching diode D1The cathode of the first triode is connected with a second triode Q2Collector of, a second switching diode D2Anode of the first triode is connected with a second triode Q2Collector of, a second switching diode D2The cathode of the first triode Q is connected with1The base electrode ofFirst switching diode D1And a second switching diode D2The model used was BAV 99.
Compared with the prior art, the invention has the beneficial effects that:
1. the utility model discloses a hall voltage sensor with adjustable adopts adjustable proportional circuit, has solved the nonadjustable problem of prior art output voltage, can realize that the transfer ratio is adjustable in succession, adjusts the input voltage of different voltage range for the voltage that can supply the industrial computer to detect.
2. The scheme of the utility model solves the problem that the detection system needs to reprocess the output voltage of the sensor in the prior art by adopting the adjustable proportion circuit, and can realize the effect of improving the test precision;
3. the utility model discloses an eliminate the maladjustment circuit, eliminate hall element N3The additional voltage brought to the Hall voltage by the unequal potential effect and other reasons including processing improves the accuracy of the test.
4. The utility model discloses because highly keep apart between output and the input, so be favorable to electrical isolation very much to reduce measuring error.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of Hall effect magnetic balance in the prior art;
fig. 2 is a schematic block diagram of an adjustable hall voltage sensor provided in an embodiment of the present invention;
fig. 3 is a schematic circuit connection diagram of an adjustable ratio circuit according to an embodiment of the present invention;
fig. 4 is a secondary circuit diagram of the adjustable hall voltage sensor provided in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The adjustable hall voltage sensor according to the embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of Hall effect magnetic balance in the prior art, with a voltage U applied1Primary side current value I through equivalent resistor RPMagnetic flux generated at primary side and secondary side current IOThe secondary current value I is obtained when the magnetic flux generated by the secondary coil is balanced (formed by amplifying the Hall voltage)OWill accurately reflect the primary side current value IPSecondary side current IOAt R0Voltage drop U overOWill accurately reflect the primary voltage value U1This is the magnetic balance principle based on the hall effect, which is also referred to as the magnetic balance principle or the hall effect closed loop principle for short.
Fig. 2 is the embodiment of the utility model provides a schematic block diagram of hall voltage sensor with adjustable, voltage sensor with adjustable that the adoption was developed based on hall effect's magnetic balance principle and adjustable proportional circuit includes:
a DC voltage input circuit connected with the primary coil for converting the transmitted voltage into primary current IPThe current forms a primary magnetic field through the primary coil.
An adjustable proportion circuit connected with the secondary voltage output end to output a voltage UOContinuously adjustable to satisfy multiple test requirements, specifically, referring to fig. 3, fig. 3 is a schematic diagram of a circuit connection with adjustable ratio provided by an embodiment of the present invention, the circuit with adjustable ratio includes a resistor R02And an adjustable resistance R01Resistance R02ToThe end is connected with the secondary side voltage output end and the resistor R02The other end of the resistor is grounded, and an adjustable resistor R is connected with the ground01Is connected in series with the voltage output end and the resistor R02Thus when the primary magnetic flux and the secondary magnetic flux are balanced, the secondary current value IOWill accurately reflect the primary side current value IPSecondary side voltage value UOWill accurately reflect the primary voltage value U1. Thus, by adjusting the adjustable resistance R01The resistance value can achieve the purpose of adjusting the transmission proportion.
A secondary current forming circuit connected with the secondary coil for amplifying the Hall voltage and converting into a secondary current IOThe current forms a secondary magnetic field through the secondary coil.
A working current circuit connected with the secondary current forming circuit, which can be a Hall element N3The secondary side current forming circuit and the offset eliminating circuit provide working current.
A detuning elimination circuit connected with the secondary current forming circuit for eliminating the Hall element N3Additional voltage to the hall voltage due to the unequal potential effect and for reasons including machining.
Referring to fig. 4, as a specific embodiment of the working current circuit of the present invention, the working current circuit includes a resistor R4Positive power supply, resistor R5A negative power supply, the working current circuit is a Hall element N3Providing an operating circuit, wherein the specific connection mode of the circuit is as follows:
hall element N31 pin (VCC +) via a resistor R4A positive power supply is connected, the positive power supply provides +15V direct current voltage for the circuit, and a Hall element N33 pin (VCC-) via a resistor R5A negative power supply is connected which provides a dc voltage of-15V to the circuit.
In order to eliminate the unwanted AC component of the DC power supply, the operating current circuit further comprises a filter capacitor C3The filter capacitor C3The positive electrode of the filter capacitor C is connected with a positive power supply3The negative electrode of the negative electrode is connected with a negative power supply.
As shown in figure 4 of the drawings, in which,as a specific embodiment of the present invention, the offset canceling circuit comprises a general operational amplifier N1Resistance R1Resistance R2The offset canceling circuit can cancel the Hall element N3The circuit is connected in a specific mode as follows, wherein the additional voltage is brought to the Hall voltage due to the unequal potential effect and reasons including processing:
general operational amplifier N1The Vcc + terminal of the general operational amplifier N is connected with a positive power supply1The model adopted is LM201, the positive power supply supplies +15V direct current voltage to the circuit, and a general operational amplifier N1Is connected to a negative power supply which supplies a DC voltage of-15V to the circuit, and an operational amplifier N1End b-cp1 of1Connecting an operational amplifier N1Cp2 terminal of, operational amplifier N1The iput2 end is connected with a resistor R1Connecting Hall element N3Pin 2, operational amplifier N1The iput1 end is connected with a resistor R2Connecting Hall element N34 pin of (1), operational amplifier N1The vout terminal outputs the processed signal to the secondary side current forming circuit.
In order to conveniently adjust the zero point, the offset eliminating circuit also comprises a resistor R7Resistance R6Resistance R8The resistors form a bias current circuit, and the specific connection mode is as follows:
hall element N31 pin connection resistor R7One terminal of (1), resistance R7Another end of the resistor R is connected with a resistor R6One terminal of (1), resistance R6Another end of the Hall element N is connected with33 pin of (1), resistance R7And a resistance R6One end connected via a resistor R8Connecting general operational amplifier N1At the iput2 end.
Referring to fig. 4, as an embodiment of the secondary current forming circuit of the present invention, the secondary current forming circuit includes a first transistor Q1A second triode Q2Resistance R3And a capacitor C2A first triode Q1The adopted model is 3904, and a second triode Q2Model 3906, noA triode Q1Collector of is connected with a general operational amplifier N1The first triode Q1The base of the second triode Q is connected with the positive power supply2Emitter of (2) is connected to the operational amplifier N1Terminal vout, second triode Q2The base of the first triode Q is connected with a negative power supply1The emitter of the first triode is connected with the second triode Q2Collector electrode of the second triode Q2The collector of the resistor is connected with the vout end and the resistor R3Is connected to one end of via a resistor R1Connecting Hall element N3Pin 2 of (1), resistance R3Via a capacitor C2The vout terminal is connected. The secondary current forming circuit passes through an operational amplifier N1Connecting secondary coil, amplifying Hall voltage and converting it into secondary current IOThe current forms a secondary magnetic field through the secondary coil.
In order to make the secondary side current forming circuit work more stably, the circuit also comprises a first switch diode D1And a second switching diode D2The switching diode is of BAV99 type, and the first switching diode D1Anode of the first triode is connected with a second triode Q2The base of the first switching diode D1The cathode of the first triode is connected with a second triode Q2Collector of, a second switching diode D2Anode of the first triode is connected with a second triode Q2Collector of, a second switching diode D2The cathode of the first triode Q is connected with1The base of (1).
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. Adjustable hall voltage sensor, its characterized in that includes:
the direct-current voltage input circuit is used for converting the transmitted voltage into primary current, and the primary current forms a primary magnetic field through a primary coil;
hall element N3The Hall element N3Comprises a primary coil and a secondary coil;
the working current circuit is used for providing working current;
the secondary side current forming circuit is used for amplifying the Hall voltage and converting the Hall voltage into secondary side current, and the secondary side current forms a secondary side magnetic field through the secondary side coil;
the adjustable proportion circuit is used for adjusting the transmission proportion to enable the output voltage to be adjustable.
2. The adjustable hall voltage sensor of claim 1 wherein the adjustable scaling circuit comprises at least one adjustable resistor R01。
3. The adjustable hall voltage sensor of claim 1 wherein the adjustable scaling circuit comprises a resistor R02And an adjustable resistance R01Resistance R02One end of the resistor R is connected with the secondary side voltage output end02The other end of the resistor is grounded, and an adjustable resistor R is connected with the ground01Is connected in series with the voltage output end and the resistor R02In the meantime.
4. The adjustable hall voltage sensor of claim 1 wherein the operating current circuit comprises a resistor R4Positive power supply, resistor R5Negative power supply, Hall element N31 pin of (2) through the resistor R4Connecting the positive power supply to Hall element N33 pin resistance R5A negative power supply is connected.
5. The adjustable hall voltage sensor of claim 4 wherein the operating current circuit further comprises a filter capacitor C3Said filter capacitor C3The positive electrode of the filter capacitor C is connected with a positive power supply3The negative electrode of the negative electrode is connected with a negative power supply.
6. The adjustable hall voltage sensor of claim 1 further comprising an offset cancellation circuit for canceling the additional voltage.
7. The adjustable hall voltage sensor of claim 6 wherein the offset cancellation circuit comprises an operational amplifier N1Resistance R1Resistance R2The operational amplifier N1End b-cp1 of1Connecting an operational amplifier N1End cp2 of the operational amplifier N1The iput2 end is connected with a resistor R1Connecting Hall element N3Pin 2 of (1), the operational amplifier N1The iput1 end is connected with a resistor R2Connecting Hall element N34 of the operational amplifier N, the operational amplifier N1The vout terminal outputs the processed signal to the secondary side current forming circuit.
8. The adjustable hall voltage sensor of claim 1 wherein the secondary current forming circuit comprises a first transistor Q1And a second triode Q2The first triode Q1The collector of the first triode Q is connected with the output end of the offset elimination circuit1The base of the first triode Q is connected with a positive power supply1The emitter of the first triode is connected with the second triode Q2Collector electrode of the second triode Q2The emitter of the second triode Q is connected with the output end of the offset eliminating circuit2The base of the second triode Q is connected with a negative power supply2The collector of which is connected with the signal output terminal.
9. The adjustable hall voltage sensor of claim 8 wherein the secondary current shaping circuit further comprises a first switching diode D1And a second switching diode D2A first switching diode D1Anode of the first triode is connected with a second triode Q2The base of (D), the first switching diode D1The cathode of the first triode is connected with a second triode Q2Collector of, a second switching diode D2Anode of (2) is connected with the secondTriode Q2Collector of, a second switching diode D2The cathode of the first triode Q is connected with1The first switching diode D1And a second switching diode D2The model used was BAV 99.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920220069.3U CN209841948U (en) | 2019-02-21 | 2019-02-21 | Adjustable Hall voltage sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920220069.3U CN209841948U (en) | 2019-02-21 | 2019-02-21 | Adjustable Hall voltage sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209841948U true CN209841948U (en) | 2019-12-24 |
Family
ID=68904031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920220069.3U Active CN209841948U (en) | 2019-02-21 | 2019-02-21 | Adjustable Hall voltage sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209841948U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858754A (en) * | 2021-01-07 | 2021-05-28 | 四川众航电子科技有限公司 | Voltage type Hall sensor device |
| CN117519397A (en) * | 2024-01-05 | 2024-02-06 | 成都新欣神风电子科技有限公司 | Zero bias adjustable circuit based on magnetic balance current sensor |
-
2019
- 2019-02-21 CN CN201920220069.3U patent/CN209841948U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858754A (en) * | 2021-01-07 | 2021-05-28 | 四川众航电子科技有限公司 | Voltage type Hall sensor device |
| CN117519397A (en) * | 2024-01-05 | 2024-02-06 | 成都新欣神风电子科技有限公司 | Zero bias adjustable circuit based on magnetic balance current sensor |
| CN117519397B (en) * | 2024-01-05 | 2024-04-12 | 成都新欣神风电子科技有限公司 | Zero bias adjustable circuit based on magnetic balance current sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103308075B (en) | Current output-type linear hall-effect sensor | |
| CN110427067A (en) | A method of improving current sample precision with analog circuit | |
| CN209841948U (en) | Adjustable Hall voltage sensor | |
| CN210071933U (en) | Signal sampling circuit | |
| CN106443150A (en) | Current sensor based on diverter | |
| CN111721995A (en) | Isolation sampling circuit of direct current voltage signal | |
| CN203870149U (en) | Non-contact linear electrical network detector | |
| CN106526295B (en) | Self calibration current comparison circuit | |
| CN102360236B (en) | High-voltage end current detection circuit | |
| CN113533817B (en) | Electronic voltage transformer and electric energy metering equipment thereof | |
| CN111342785B (en) | Signal conditioning circuit | |
| CN106571824A (en) | Signal processing circuit | |
| CN107134982B (en) | Device for increasing input voltage acquisition compensation operational amplifier offset voltage of operational amplifier | |
| CN108649933B (en) | Window voltage comparison circuit | |
| CN216718524U (en) | High-precision low-temperature drift open-loop hall current sensor | |
| CN206038759U (en) | New forms of energy electric automobile high accuracy current detection circuit | |
| CN110244128A (en) | Thermal resistance four-wire system real-time measurement circuit and its implementation | |
| CN214471434U (en) | Anti-interference circuit and device based on pressure sensor and pressure sensor | |
| CN110032236B (en) | DC sensor circuit with arbitrary bias voltage output | |
| CN211718374U (en) | Current detection circuit and current detection equipment | |
| CN110333384B (en) | Three-phase alternating current voltage high-precision rapid detection circuit based on mutual inductor | |
| CN211293084U (en) | Electrostatic field detection device adopting reverse electric field compensation technology | |
| CN218994552U (en) | Temperature transmitter | |
| CN113155159A (en) | Bridge type detector | |
| CN110987028A (en) | Temperature compensation system and compensation method of magnetic encoder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |