CN207363801U - A kind of high-precision hall formula sensor circuit - Google Patents
A kind of high-precision hall formula sensor circuit Download PDFInfo
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- CN207363801U CN207363801U CN201721340881.7U CN201721340881U CN207363801U CN 207363801 U CN207363801 U CN 207363801U CN 201721340881 U CN201721340881 U CN 201721340881U CN 207363801 U CN207363801 U CN 207363801U
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Abstract
The utility model discloses a kind of high-precision hall formula sensor circuit, including voltage-stabilizing protection unit, static high level keep functional unit, signal conversion unit, reverse connecting protection unit, filtering output unit；The reverse connecting protection unit one terminates external power supply, and the other end keeps functional unit, signal conversion unit to be electrically connected with voltage-stabilizing protection unit, static high level respectively；The filtering output unit one terminates external power supply, and the other end keeps functional unit to be electrically connected with static high level；The static state high level keeps functional unit to be also electrically connected respectively with voltage-stabilizing protection unit, signal conversion unit；The signal conversion unit includes Hall chip IC1；The first pin of the Hall chip IC1 is electrically connected with reverse connecting protection unit, and second pin ground connection, the 3rd pin keeps functional unit to be electrically connected with static high level.The utility model has the characteristics that precision is high, highly reliable, stability is strong, strong antijamming capability.
Description
Technical field
It the utility model is related to sensor application technical field, more particularly to a kind of high-precision hall formula sensor circuit.
Background technology
Most of engine ignition of existing automobile is sensed using magneto-electric, and magneto-electric inductive output signal is analog voltage
Signal is shaped to square-wave signal, could carry out signal operation processing, it is necessary to ECU first carries out signal shaping.In addition, magneto-electric sense
Passive device, analog voltage signal output should be belonged to, output voltage can change with the change in signal wheel speed and sensing gap,
So as to cause its precision and stability poor, poor anti jamming capability.
In summary, there is the problem of inconvenience in practice, it is therefore necessary to add in the engine ignition of the magneto-electric sensing
To improve.
Utility model content
The purpose of this utility model is to provide a kind of high-precision hall formula sensor circuit, high, highly reliable, steady with precision
The features such as qualitative strong, strong antijamming capability.
To achieve the above object, using following technical scheme：
A kind of high-precision hall formula sensor circuit, including voltage-stabilizing protection unit, static high level keep functional unit, signal
Converting unit, reverse connecting protection unit, filtering output unit；The reverse connecting protection unit one terminates external power supply, other end difference
Functional unit, signal conversion unit is kept to be electrically connected with voltage-stabilizing protection unit, static high level；The filtering output unit one
External power supply is terminated, the other end keeps functional unit to be electrically connected with static high level；The static state high level keeps function list
Member is also electrically connected with voltage-stabilizing protection unit, signal conversion unit respectively；The signal conversion unit includes Hall chip IC1；
The first pin of the Hall chip IC1 is electrically connected with reverse connecting protection unit, second pin ground connection, and the 3rd pin is high with static state
Level keeps functional unit to be electrically connected.
It is preferred that the static state high level keeps functional unit to include voltage comparator U1B, resistance R1, resistance R2, resistance
R3, resistance R4, diode D1, diode D2, capacitance C1；The IN+ pins of the voltage comparator U1B respectively with resistance R1 mono-
End, resistance R2 one end are electrically connected；The other end of the resistance R1 is electrically connected with the 3rd pin of Hall chip IC1；It is described
The other end of resistance R2 is electrically connected with reverse connecting protection unit；The IN- pins of the voltage comparator U1B respectively with resistance R3 mono-
End, resistance R4 one end are electrically connected；The resistance R3 other ends respectively with diode D1 anode, diode D2 cathodes, capacitance C1
One end is electrically connected；3rd pin of the diode D1 cathodes and Hall chip IC1 is electrically connected；The diode D2 anode
It is electrically connected with reverse connecting protection unit；The resistance R4 other ends, the capacitance C1 other ends are grounded；The voltage comparator U1B
Vcc pins and voltage-stabilizing protection unit be electrically connected, GND pin ground connection, OUT pins are electrically connected with filtering output unit.
It is preferred that the voltage-stabilizing protection unit includes voltage-stabiliser tube D3, resistance R5；Described resistance R5 one end and reverse connecting protection list
Member is electrically connected, and the other end is grounded after being electrically connected with voltage-stabiliser tube D3.
It is preferred that the reverse connecting protection unit includes diode D4；The diode D4 cathodes electrically connect with external power supply
Connect, the other end the first pin with Hall chip IC1, the resistance R5 other ends, the resistance R2 other ends, diode D2 negative electricities respectively
Property connection.
It is preferred that the filtering output unit includes resistance R6, resistance R7, capacitance C2；Described resistance R6 one end and outside
Power supply is electrically connected, and OUT pin of the other end respectively with resistance R7 one end, capacitance C2 one end, voltage comparator U1B electrically connects
Connect；Another termination output terminals of resistance R7；The capacitance C2 other ends ground connection.
Using the above scheme, the beneficial effects of the utility model are：
1) the utility model can improve sensor circuit output signal accuracy, stability, antijamming capability, anti-interference energy
Power, precision will not be influenced be subject to rotating speed and sensing gap；
2) Hall-type sensing belongs to active device, and is that analog signal is converted into digital signal, through central processing electricity
Road accurately calculates, and square-wave signal is directly exported after processing, can directly be used for automobile ECU, without shape finishing circuit, circuit knot
Structure is simple.
Brief description of the drawings
Fig. 1 is the schematic diagram of the utility model；
Fig. 2 is the circuit diagram of the utility model；
Fig. 3 is the output square-wave signal figure of the utility model；
Wherein, attached drawing identifier declaration：
1-voltage-stabilizing protection unit, 2-static state high level keep functional unit,
3-signal conversion unit, 4-reverse connecting protection unit,
5-filtering output unit, 6-power supply,
7-signal wheel.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Referring to figs. 1 to shown in 3, the utility model provides a kind of high-precision hall formula sensor circuit, including voltage-stabilizing protection list
Member 1, static high level keep functional unit 2, signal conversion unit 3, reverse connecting protection unit 4, filtering output unit 5；It is described anti-
Connect protection location 4 one and terminate external power supply 6, the other end kept respectively with voltage-stabilizing protection unit 1, static high level functional unit 2,
Signal conversion unit 3 is electrically connected；The filtering output unit 5 one terminates external power supply 6, and the other end is kept with static high level
Functional unit 2 is electrically connected；The static state high level keeps functional unit 2 also single with voltage-stabilizing protection unit 1, signal conversion respectively
Member 3 is electrically connected；The signal conversion unit 3 includes Hall chip IC1；The first pin of the Hall chip IC1 and reversal connection
Protection location 4 is electrically connected, and second pin ground connection, the 3rd pin keeps functional unit 2 to be electrically connected with static high level.
Wherein, the static high level keeps functional unit 2 to include voltage comparator U1B, resistance R1, resistance R2, resistance
R3, resistance R4, diode D1, diode D2, capacitance C1；The IN+ pins of the voltage comparator U1B respectively with resistance R1 mono-
End, resistance R2 one end are electrically connected；The other end of the resistance R1 is electrically connected with the 3rd pin of Hall chip IC1；It is described
The other end of resistance R2 is electrically connected with reverse connecting protection unit 4；The IN- pins of the voltage comparator U1B respectively with resistance R3
One end, resistance R4 one end are electrically connected；The resistance R3 other ends respectively with diode D1 anode, diode D2 cathodes, capacitance
C1 one end is electrically connected；3rd pin of the diode D1 cathodes and Hall chip IC1 is electrically connected；The diode D2 is born
Pole is electrically connected with reverse connecting protection unit 4；The resistance R4 other ends, the capacitance C1 other ends are grounded；The voltage comparator
The Vcc pins of U1B are electrically connected with voltage-stabilizing protection unit, and GND pin ground connection, OUT pins are electrically connected with filtering output unit.
The voltage-stabilizing protection unit 1 includes voltage-stabiliser tube D3, resistance R5；Described resistance R5 one end and the electricity of reverse connecting protection unit 4
Property connection, be grounded after the other end and voltage-stabiliser tube D3 electric connection.
The reverse connecting protection unit 4 includes diode D4；The diode D4 cathodes are electrically connected with external power supply 6, separately
The first pin with Hall chip IC1, the resistance R5 other ends, the resistance R2 other ends, diode D2 anode electrically connect respectively for one end
Connect.
The filtering output unit 5 includes resistance R6, resistance R7, capacitance C2；Described resistance R6 one end and the electricity of external power supply 6
Property connection, the other end is electrically connected with the OUT pins of resistance R7 one end, capacitance C2 one end, voltage comparator U1B respectively；It is described
Another termination output terminals of resistance R7；The capacitance C2 other ends ground connection.
Utility model works principle：
Voltage-stabilizing protection unit 1：Voltage-stabiliser tube D3, resistance R5 form regulator circuit and power to voltage comparator U1B, prevent power supply
6 voltage fluctuations cause to damage to voltage comparator U1B.
Static high level keeps functional unit 2：Ensure to export high level all the time when signal wheel 7 is static；Wherein, resistance R1,
Resistance R2 is the pull-up resistor of Hall chip IC1, there is provided output voltage, provides voltage to Hall chip IC1 output stages, make it can
With normal output voltage signal.
Signal conversion unit 3：Using Hall chip IC1, the rotation situation of inductive signal, is converted into digital voltage signal.
Reverse connecting protection unit 4：It is connected using diode D4 cathodes with external power supply 6, prevents 6 electric voltage reverse-connection of power supply from causing device
Part damages.
Filter output unit 5：Resistance R6 is voltage comparator U1B output pull-up resistors, gives voltage comparator U1B output stages
Voltage is provided, makes it can be with normal output voltage signal；Resistance R7, capacitance C2 are output current limiting protective resistances, make output signal
Stablize, protect voltage comparator U1B not damaged by external interference signals.
In the utility model, the first pin of Hall chip IC1 is used to connect external power supply 6 after reverse connecting protection unit 4, the
Two pins are used to be grounded, and the 3rd pin is used to export.
Hall effect：The static current-carrying semiconductor being placed in magnetic field, when its current direction and magnetic direction are inconsistent,
Electromotive force is produced parallel between two faces on electric current and magnetic direction on current－carrying conductor, this phenomenon claims Hall effect, should
Potential claims Hall voltage.
The utility model is used cooperatively with the signal wheel 7 on automobile, and for signal wheel 7 in rotation, the bumps of tooth cause magnetic circuit
The change of magnetic resistance, thus change the magnetic flux of thorough coil, induced electromotive force is produced in coil, for the ECU (electronics on automobile
Control unit) use.
Signal wheel 7 changes the magnetic resistance of Hall chip IC1 magnetic circuits in rotation, thus changes the magnetic through Hall chip IC1
Flux.According to Hall effect, the electromotive force of change can be produced on Hall chip IC1, is amplified through Hall chip IC1 internal signals
After circuit amplification, it is not necessary to which ECU shapings can directly export square-wave signal.7 rotation speed change of signal wheel and the change of sensing gap
It will not result in the change of the utility model output voltage.
When signal wheel 7 is static not to be turned, Hall chip IC1 can sense static relatively high-intensity magnetic field or static relatively weak magnetic
.
When Hall chip IC1 senses static relatively high-intensity magnetic field, the 3rd pin of Hall chip IC1 ends in height over the ground
Resistance state, 6 voltage of power supply are input to the IN+ pins of voltage comparator U1B through diode D4, resistance R2, form high potential.At the same time
Charge through resistance R1, diode D1 to capacitance C1, the IN- that voltage comparator U1B is input to after resistance R3, resistance R4 partial pressures draws
Foot, forms high potential.Since the partial pressure of resistance R1, diode D1, resistance R3, resistance R4 act on, make the IN of voltage comparator U1B
+ pin voltage is more than reverse input end voltage, and voltage comparator U1B persistently exports high level, is exported through resistance R7.
When Hall chip IC1 senses static relatively low-intensity magnetic field, the 3rd pin of Hall chip IC1 is turned in low over the ground
Resistance state, 6 voltage of power supply are input to the IN+ pins of voltage comparator U1B through diode D4, resistance R2, form high potential.Capacitance
C1 stores voltage, and the IN- pins of voltage comparator U1B are input to after resistance R3, resistance R4 partial pressures, forms high potential.Due to
The partial pressure effect of resistance R1, diode D1, resistance R3, resistance R4, make the IN+ pin voltages of voltage comparator U1B be more than reversely
Input terminal voltage, voltage comparator U1B temporarily export low level, are exported through resistance R7.Capacitance C1 is through resistance R3, resistance R4 at the same time
Electric discharge, upon discharging between continue 10S after, resistance R3, resistance R4 partial pressures are supplied to the level of voltage comparator U1B reverse input ends
IN+ pin levels can be less than, voltage comparator U1B persistently exports high level, is exported through resistance R7.
When signal wheel 7 rotates, the magnetic loop of Hall chip IC1 can be changed, Hall chip IC1 can be sensed and gear teeth phase
Corresponding changes of magnetic field, voltage signal is converted into through Hall chip IC1 internal circuits, defeated by the 3rd pin of Hall chip IC1
Go out the square wave voltage signal of low and high level change.
When Hall chip IC1 output voltage signals instantaneous state is in high level, the 3rd pin pair of Hall chip IC1
Ground cut-off is in high-impedance state, and 6 voltage of power supply is input to the IN+ pins of voltage comparator U1B through diode D4, resistance R2, is formed
High potential.Meanwhile charge through resistance R1, diode D1 to capacitance C1, being input to voltage after resistance R3, resistance R4 partial pressures compares
The IN- pins of device U1B, form high potential.Since the partial pressure of resistance R1, diode D1, resistance R3, resistance R4 act on, make voltage
The IN+ pin voltages of comparator U1B are more than reverse input end voltage, and voltage comparator U1B output high level is defeated through resistance R7
Go out.
When Hall chip IC1 output voltage signals instantaneous state is in low level, the 3rd pin pair of Hall chip IC1
Ground conducting is in low resistive state, and 6 voltage of power supply is input to the IN+ pins of voltage comparator U1B through diode D4, resistance R2, is formed
High potential.Capacitance C1 stores voltage, and the IN- pins of voltage comparator U1B are input to after resistance R3, resistance R4 partial pressures, is formed
High potential.Since the partial pressure of resistance R1, diode D1, resistance R3, resistance R4 act on, the IN+ pins of the voltage comparator U1B made
Voltage is more than reverse input end voltage, and voltage comparator U1B temporarily exports low level, while capacitance C1 is through resistance R3, resistance R4
Discharge, but discharge time is more than 10S.Since Hall chip IC1 output voltage signal instantaneous state transformation periods are far smaller than
10S, so capacitance C1 is that continue for moment to enter charged state again in discharge time, does not interfere with voltage comparator U1B outputs
State.When Hall chip IC1 output voltage signal instantaneous states become high level, voltage comparator U1B output high level, warp
Resistance R7 is exported.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the present invention, all in this practicality
All any modification, equivalent and improvement made within new spirit and principle etc., should be included in the guarantor of the utility model
Within the scope of shield.
Claims (5)
1. a kind of high-precision hall formula sensor circuit, it is characterised in that keep function including voltage-stabilizing protection unit, static high level
Unit, signal conversion unit, reverse connecting protection unit, filtering output unit；The reverse connecting protection unit one terminates external power supply, separately
One end keeps functional unit, signal conversion unit to be electrically connected with voltage-stabilizing protection unit, static high level respectively；The filtering is defeated
Go out unit one and terminate external power supply, the other end keeps functional unit to be electrically connected with static high level；The static state high level is protected
Functional unit is held also to be electrically connected with voltage-stabilizing protection unit, signal conversion unit respectively；The signal conversion unit includes Hall
Chip IC 1；The first pin of the Hall chip IC1 is electrically connected with reverse connecting protection unit, second pin ground connection, the 3rd pin
Functional unit is kept to be electrically connected with static high level.
2. high-precision hall formula sensor circuit according to claim 1, it is characterised in that the static state high level keeps work(
Energy unit includes voltage comparator U1B, resistance R1, resistance R2, resistance R3, resistance R4, diode D1, diode D2, capacitance C1；
The IN+ pins of the voltage comparator U1B are electrically connected with resistance R1 one end, resistance R2 one end respectively；The resistance R1's is another
One end and the 3rd pin of Hall chip IC1 are electrically connected；The other end of the resistance R2 is electrically connected with reverse connecting protection unit；
The IN- pins of the voltage comparator U1B are electrically connected with resistance R3 one end, resistance R4 one end respectively；The resistance R3 is another
End is electrically connected with diode D1 anode, diode D2 cathodes, capacitance C1 one end respectively；The diode D1 cathodes and Hall core
The 3rd pin of piece IC1 is electrically connected；The diode D2 anode are electrically connected with reverse connecting protection unit；The resistance R4 is another
End, the capacitance C1 other ends are grounded；The Vcc pins of the voltage comparator U1B are electrically connected with voltage-stabilizing protection unit, and GND draws
Foot is grounded, and OUT pins are electrically connected with filtering output unit.
3. high-precision hall formula sensor circuit according to claim 2, it is characterised in that the voltage-stabilizing protection unit includes
Voltage-stabiliser tube D3, resistance R5；Described resistance R5 one end is electrically connected with reverse connecting protection unit, and the other end is electrically connected with voltage-stabiliser tube D3
After be grounded.
4. high-precision hall formula sensor circuit according to claim 3, it is characterised in that the reverse connecting protection unit includes
Diode D4；The diode D4 cathodes are electrically connected with external power supply, and the other end draws with the first of Hall chip IC1 respectively
Foot, the resistance R5 other ends, the resistance R2 other ends, diode D2 anode are electrically connected.
5. high-precision hall formula sensor circuit according to claim 2, it is characterised in that the filtering output unit includes
Resistance R6, resistance R7, capacitance C2；Described resistance R6 one end and external power supply are electrically connected, the other end respectively with resistance R7 one end,
Capacitance C2 one end, the OUT pins of voltage comparator U1B are electrically connected；Another termination output terminals of resistance R7；The capacitance C2
The other end is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721340881.7U CN207363801U (en) | 2017-10-16 | 2017-10-16 | A kind of high-precision hall formula sensor circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721340881.7U CN207363801U (en) | 2017-10-16 | 2017-10-16 | A kind of high-precision hall formula sensor circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207363801U true CN207363801U (en) | 2018-05-15 |
Family
ID=62420490
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721340881.7U Expired - Fee Related CN207363801U (en) | 2017-10-16 | 2017-10-16 | A kind of high-precision hall formula sensor circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110500947A (en) * | 2019-09-16 | 2019-11-26 | 长沙市健科电子有限公司 | A kind of engine angular transducer |
-
2017
- 2017-10-16 CN CN201721340881.7U patent/CN207363801U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110500947A (en) * | 2019-09-16 | 2019-11-26 | 长沙市健科电子有限公司 | A kind of engine angular transducer |
| CN110500947B (en) * | 2019-09-16 | 2021-07-13 | 长沙市健科电子有限公司 | Engine angle sensor |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180515 Termination date: 20211016 |
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| CF01 | Termination of patent right due to non-payment of annual fee |