CN207095698U - A kind of digital instrument communicates equipotential automatic tracking circuit with digital sensor - Google Patents
A kind of digital instrument communicates equipotential automatic tracking circuit with digital sensor Download PDFInfo
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- CN207095698U CN207095698U CN201720739149.0U CN201720739149U CN207095698U CN 207095698 U CN207095698 U CN 207095698U CN 201720739149 U CN201720739149 U CN 201720739149U CN 207095698 U CN207095698 U CN 207095698U
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Abstract
A kind of digital instrument is the utility model is related to communicate with digital sensor equipotential automatic tracking circuit, it is arranged in digital instrument and is connected respectively with the first communication chip in digital sensor, the second communication chip in digital instrument, the communication connection end of the first communication chip is connected with the communication connection end of the second communication chip.The digital instrument equipotential automatic tracking circuit that communicated with digital sensor includes power supply and voltage follower, the common port of second communication chip is connected with the output end of voltage follower, and the normal phase input end of voltage follower is connected with the common port of the first communication chip.Pass through the setting of voltage follower, realize that the common-mode voltage of second communication chip at digital instrument end and first communication chip at digital sensor end is consistent, will not occur situation about being depressured with the change of communication distance, solve the problems, such as that digital transducer communication distance is limited by its own device common-mode voltage, improve the stability to be communicated between digital instrument and digital sensor.
Description
Technical field
It the utility model is related to electronic technology field, and in particular to a kind of digital instrument communicates equipotential with digital sensor
Automatic tracking circuit.
Background technology
Digital instrument and digital sensor are widely applied for weighing, and Authorization Notice No. is CN103234614B (Shens
Please be number for Chinese invention patent 201310136115.9)《Weighing-appliance for container》, wherein disclosed weighing-appliance
Then include instrument and digital sensor, digital sensor is connected by cable with instrument, and the weight letter of digital sensor detection
Number then it is transmitted by digital sensor and the communication chip in instrument.
RS-485 standards are commonly used as a kind of relatively economical, have at a relatively high noise suppressed, relatively high transmission speed
Rate, long transmission distance, the communications platform of wide common mode range.RS-485 standards are sent using balanced type, the data that differential type receives
Transceiver drives bus.The common-mode voltage range allowed on signal wire is+7V~-12V.Existing truck scale is typically with 8
Numbers above sensor, sensor impedance is small, communication distance farther out when power line have pressure drop, cause the voltages that number is caught to become
It is small, if scene apart from it is far, it is necessary to improve supply voltage could meet sensor minimal power requirement, so result in instrument
End and the RS485 chip common-mode voltage over range of sensor side, cause communication unstable, or even can not use.
Utility model content
Technical problem to be solved in the utility model is to provide one kind for above-mentioned prior art to can solve the problem that communication connects
The communication equipotential automatic tracking circuit for the problem of mouth circuit common-mode voltage is big, communication distance is short.
The technical scheme in the invention for solving the above technical problem is：A kind of digital instrument communicates with digital sensor
Equipotential automatic tracking circuit, be arranged in digital instrument and respectively with the first communication chip, the digital instrument in digital sensor
The second communication chip in table is connected, the communication connection end of first communication chip and the communication connection of the second communication chip
End is connected, it is characterised in that：Including power supply and voltage follower；
Power input of the both ends of the power supply respectively with the digital sensor is connected, the common port of the power supply
It is connected with ground wire, the voltage input end with the second communication chip, the voltage of voltage follower are defeated respectively for the voltage output end of power supply
Enter end to be connected；
The common port of second communication chip is connected with the output end of voltage follower；
The normal phase input end of the voltage follower is connected with the common port of the first communication chip, the voltage follower
Common port be connected with ground wire.
Meet the job requirement of the second communication chip, institute to the supply voltage of the second communication chip in order to facilitate regulation power supply
The voltage output end for stating power supply is connected by a voltage-regulation chip with the voltage input end of the second communication chip, the voltage
The common port of regulation chip is connected with the output end of the voltage follower.
Selectively, the voltage-regulation chip is three-terminal voltage-stabilizing chip or switching mode voltage stabilizing chip.
Preferably, first communication chip and the second communication chip are RS485 communication chips.
Compared with prior art, the utility model has the advantage of：By the setting of voltage follower, digital instrument is realized
Second communication chip at end is consistent with the common-mode voltage of first communication chip at digital sensor end, will not be with communication distance
Change and situation about being depressured occur, solve digital transducer communication distance and asked by what its own device common-mode voltage was limited
Topic, improves the stability to be communicated between digital instrument and digital sensor.
Brief description of the drawings
Fig. 1 is that digital instrument communicates the electricity of equipotential automatic tracking circuit with digital sensor in the utility model embodiment
Lu Tu.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing embodiment.
The first communication chip 11 is provided with digital sensor 1, the second communication chip 21 is provided with digital instrument 2, is led to
Cross between the communication connection end of the first communication chip 11 and the second communication chip 21 and connect, digital sensor 1 is realized with digital instrument 2
Communication connection, in this way, the data signal that digital sensor 1 gathers can be sent in digital instrument 2, and then shown.This
The first communication chip 11 and the second communication chip 21 are RS485 communication chips in embodiment, and when weigh application, numeral passes
Sensor 1 is then weighing sensor, and digital instrument 2 is weighing instrument.
The equipotential automatic tracking circuit as shown in figure 1, the digital instrument 2 in the present embodiment communicates with digital sensor 1, if
Put and be connected respectively with the first communication chip 11, the second communication chip 21 in digital instrument 2.The equipotential automatic tracking circuit
Including power supply 3, voltage follower 4.
The common port of power supply 3 is connected with ground wire.Power input of the both ends of power supply 3 respectively with digital sensor 1 is connected
Connect, the voltage input end of the voltage output end of power supply 3 also with voltage follower 4 is connected.
The voltage output end of power supply 3 is connected by a voltage-regulation chip 5 with the voltage input end of the second communication chip 21
Connect, the common port of the voltage-regulation chip 5 is connected with the output end of voltage follower 4.Voltage-regulation chip 5 is three-terminal voltage-stabilizing
Chip or switching mode voltage stabilizing chip.
The common port of second communication chip 21 is connected with the output end of voltage follower 4.
The normal phase input end of voltage follower 4 is connected with the common port of the first communication chip 11, the public affairs of voltage follower 4
End is connected with ground wire altogether.The selection principle of voltage follower 4 is：Low input bias current, low input offset voltage and offset current, altogether
Mould wide input voltage range (can arrive 0V), and output voltage swing can as little as 0V.The chip conduct such as LM358, LM324 can such as be selected
Voltage follower 4 uses.
The digital instrument 2 communicates equipotential automatic tracking circuit with digital sensor 1 when in use, passes through voltage follower
4 effect, the common-mode voltage of second communication chip 21 and first communication chip 11 at the end of digital sensor 1 at the end of digital instrument 2
It is always consistent, will not occur situation about being depressured with the change of communication distance, solve digital transducer communication away from
The problem of from being limited by its own device common-mode voltage, improve the stability to be communicated between digital instrument 2 and digital sensor 1.
Claims (4)
- The equipotential automatic tracking circuit 1. a kind of digital instrument communicates with digital sensor, it is arranged in digital instrument (2) and divides It is not connected with the first communication chip (11) in digital sensor (1), the second communication chip (21) in digital instrument (2), The communication connection end of first communication chip (11) is connected with the communication connection end of the second communication chip (21), and its feature exists In：Including power supply (3) and voltage follower (4)；The both ends of the power supply (3) are connected with power supply (3) input of the digital sensor (1) respectively, the power supply (3) Common port be connected with ground wire, the voltage output end of power supply (3) voltage input end, the voltage with the second communication chip (21) respectively The voltage input end of follower (4) is connected；The common port of second communication chip (21) is connected with the output end of voltage follower (4)；The normal phase input end of the voltage follower (4) is connected with the common port of the first communication chip (11), the voltage with It is connected with the common port of device (4) with ground wire.
- 2. communication equipotential automatic tracking circuit according to claim 1, it is characterised in that：The voltage of the power supply (3) Output end is connected by a voltage-regulation chip (5) with the voltage input end of the second communication chip (21), the voltage-regulation The common port of chip (5) is connected with the output end of the voltage follower (4).
- 3. communication equipotential automatic tracking circuit according to claim 2, it is characterised in that：The voltage-regulation chip (5) it is three-terminal voltage-stabilizing chip or switching mode voltage stabilizing chip.
- 4. the communication equipotential automatic tracking circuit according to claims 1 to 3 any claim, it is characterised in that：Institute It is RS485 communication chips to state the first communication chip (11) and the second communication chip (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720739149.0U CN207095698U (en) | 2017-06-23 | 2017-06-23 | A kind of digital instrument communicates equipotential automatic tracking circuit with digital sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720739149.0U CN207095698U (en) | 2017-06-23 | 2017-06-23 | A kind of digital instrument communicates equipotential automatic tracking circuit with digital sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207095698U true CN207095698U (en) | 2018-03-13 |
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ID=61553731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720739149.0U Active CN207095698U (en) | 2017-06-23 | 2017-06-23 | A kind of digital instrument communicates equipotential automatic tracking circuit with digital sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207095698U (en) |
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2017
- 2017-06-23 CN CN201720739149.0U patent/CN207095698U/en active Active
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