CN110707678A - Double-line process device - Google Patents
Double-line process device Download PDFInfo
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- CN110707678A CN110707678A CN201910567270.3A CN201910567270A CN110707678A CN 110707678 A CN110707678 A CN 110707678A CN 201910567270 A CN201910567270 A CN 201910567270A CN 110707678 A CN110707678 A CN 110707678A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/06—Two-wire systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
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- Arrangements For Transmission Of Measured Signals (AREA)
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Abstract
The invention ensures the current consumed by the communication between the master machine and the slave machine without sacrificing the consumed current at other places. The master machine is provided with a master machine main circuit and a master machine auxiliary circuit. The sub machine is provided with a sub machine main circuit and a sub machine auxiliary circuit. The master-slave circuit is provided with a parallel regulator, and generates a power supply voltage to the master-slave power supply circuit that supplies the power supply voltage to the communication driver, using a current that is used in the master main circuit and returned to the two-wire transmission path via the current detection resistor. The slave unit sub-circuit is provided with a parallel regulator, and generates a power supply voltage to the slave unit sub-power supply circuit that supplies the power supply voltage to the communication driver, using a current that is used in the slave unit main circuit and returned to the two-wire transmission path via the current detection resistor.
Description
Technical Field
The present invention relates to a two-wire process apparatus including a power supply circuit that generates a power supply voltage from a current supplied through a two-wire transmission path, and a current control circuit that controls a current flowing through the transmission path.
Background
Conventionally, as a device for monitoring and controlling the operation of an industrial process, a two-wire process device is used, which includes a power supply circuit that generates a power supply voltage from a current supplied through a two-wire transmission path, and a current control circuit that controls the magnitude of a current flowing through the transmission path in accordance with a process state or the like.
Fig. 5 shows an example of a two-wire process apparatus including a master unit and a slave unit (see, for example, patent document 1). The two-wire processing apparatus 200 is configured to include a master machine 3 and a slave machine 4.
The master 3 includes a cpu (central Processing unit)3_1 and a current control circuit 3_ 2. The slave unit 4 includes a CPU4_1, an a/D converter 4_2, and a sensor 4_ 3.
In the two-wire process apparatus 200, the sensor 4_3 of the slave machine 4 is, for example, a pressure sensor. The measurement value (analog value) in the sensor 4_3 is converted into a digital value by the a/D converter 4_2 and sent to the CPU4_ 1. The CPU4_1 sends the measured value from the a/D converter 4_2 to the parent device 3 as data.
The CPU3_1 of the master unit 3 takes in data (measurement value) from the slave unit 4. The CPU3_1 sends the fetched data to the current control circuit 3_ 2. The current control circuit 3_2 adjusts the value of the current I returned to the two-wire transmission path L so as to be a current value corresponding to the data from the CPU3_ 1.
Documents of the prior art
Patent document
Patent document 1: specification of U.S. Pat. No. 5870695
Disclosure of Invention
Problems to be solved by the invention
In the two-wire process apparatus 200, when the current (current signal) I supplied through the two-wire transmission path L is set to 4 to 20mA, for example, the current that can be used in the two-wire process apparatus 200 is limited to 4mA or less (e.g., 3.6mA) that can be always ensured.
However, there are problems as follows: in an environment with a large noise such as a factory, it is preferable that the current consumed for communication between the master unit 3 and the slave unit 4 is large, and if the current consumed for communication between the master unit 3 and the slave unit 4 is to be secured, the current consumed elsewhere must be sacrificed.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a two-wire process apparatus capable of securing a current consumed for communication between a master unit and a slave unit without sacrificing a current consumed elsewhere.
Means for solving the problems
In order to achieve the above object, the present invention provides a two-wire process apparatus (100) comprising: a primary power supply circuit (12_1) configured to generate a power supply voltage (V1) from a current supplied via a two-wire transmission path (L); a main power supply circuit (12_2) of the base unit, which is configured to receive a power supply voltage supplied from the primary power supply circuit and generate a main power supply voltage (V2) used in the base unit (1); a slave unit main power supply circuit (21_1) configured to receive power supplied from the primary power supply circuit and generate a main power supply voltage (V3) used by the slave unit (2); and a current detection resistor (14) that detects a value of a current returned to the two-wire transmission path, wherein the two-wire process device (100) receives data transmitted from the slave unit via the master unit, and adjusts the value of the current detected by the current detection resistor based on the received data, and wherein the master unit (1) is provided with: a main circuit (12) of the main unit, which is provided with a primary power supply circuit (12_1), a main power supply circuit (12_2) of the main unit, and a calculation processing unit (12_3) of the main unit end, wherein the calculation processing unit of the main unit end is configured to receive a power supply voltage provided by the main power supply circuit of the main unit and operate; a master-slave circuit (13) including a master-side communication driver (13_1) configured to transmit and receive data to and from a slave unit, a master-slave power supply circuit (13_2) configured to generate a power supply voltage (V5) to the master-side communication driver, and a master-side parallel regulator (13_3) configured to generate a power supply voltage (V4) to the master-slave power supply circuit; and a master-end isolator (15) configured to transmit and receive digital data between the arithmetic processing unit on the master end and the communication driver on the master end in an insulated manner, wherein the slave unit (2) includes: a slave unit main circuit (21) which is provided with a slave unit main power supply circuit (21_1) and a slave unit-side arithmetic processing unit (21_2) that is configured to operate by receiving a power supply voltage supplied from the slave unit main power supply circuit; a slave unit sub-circuit (22) including a slave unit side communication driver (22_1) configured to transmit and receive data to and from the master unit, a slave unit side power supply circuit (22_2) configured to generate a power supply voltage (V7) to the slave unit side communication driver, and a slave unit side parallel regulator (22_3) configured to generate a power supply voltage (V6) to the slave unit side power supply circuit; and an isolator (23) on the slave side configured to transmit and receive digital data between the arithmetic processing unit on the slave side and the communication driver on the slave side in an insulated manner, wherein the parallel regulator on the master side generates a power supply voltage to the slave power supply circuit on the master side by using a current (IM) which IS used in the master main circuit and returned to the two-wire transmission path via the current detection resistor, and the parallel regulator on the slave side generates a power supply voltage to the slave sub-power supply circuit by using a current (IS) which IS used in the slave main circuit and returned to the two-wire transmission path via the current detection resistor.
In the invention, the master machine is provided with a master machine main circuit and a master machine auxiliary circuit, and the slave machine is provided with a slave machine main circuit and a slave machine auxiliary circuit. The transmission and reception of digital data between the arithmetic processing unit in the main master circuit and the communication driver in the sub-master circuit on the master unit and the transmission and reception of digital data between the arithmetic processing unit in the main sub-master circuit and the communication driver in the sub-master sub-circuit on the sub-unit are performed in an insulated manner by respective isolators.
In the present invention, a power supply voltage (constant voltage) is supplied from a parallel regulator on the master side to a master-slave power supply circuit that supplies the power supply voltage to a communication driver on the master side. In addition, a power supply voltage (constant voltage) is supplied from the parallel regulator on the slave side to the slave side power supply circuit which supplies the power supply voltage to the communication driver on the slave side.
In this case, the parallel regulator on the master side generates a power supply voltage to the master sub-power supply circuit by using a current that is used in the master main circuit and returned to the two-wire transmission path via the current detection resistor, and the parallel regulator on the slave side generates a power supply voltage to the slave sub-power supply circuit by using a current that is used in the slave main circuit and returned to the two-wire transmission path via the current detection resistor.
In the above description, components corresponding to the components of the invention are indicated by bracketed reference numerals in the drawings as an example.
ADVANTAGEOUS EFFECTS OF INVENTION
As described above, according to the present invention, the main-unit-side parallel regulator generates the power supply voltage to the main-unit sub power supply circuit by using the current that is used in the main circuit of the main unit and returned to the two-wire transmission path via the current detection resistor, and the sub-unit-side parallel regulator generates the power supply voltage to the sub-unit sub power supply circuit by using the current that is used in the main circuit of the sub-unit and returned to the two-wire transmission path via the current detection resistor.
Drawings
Fig. 1 is a diagram showing a main part of a two-wire process apparatus according to an embodiment of the present invention.
Fig. 2 is a diagram showing an example in which a current control circuit is provided at the master-slave circuit side.
Fig. 3 shows a master unit and a slave unit as 1: 1.
Fig. 4 shows a case where the master unit 1 and the slave units 2 are 1: n (N.gtoreq.2).
Fig. 5 is a diagram showing an example of a two-wire process apparatus including a master unit and a slave unit.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 is a diagram showing a main part of a two-wire process apparatus 100(100A) according to an embodiment of the present invention.
The two-wire process apparatus 100 is realized by hardware including a processor and a storage device, and a program for realizing various functions in cooperation with the hardware, and is composed of a master unit 1 and a slave unit 2.
The base unit 1 includes a base unit main circuit 12, a base unit sub circuit 13, a current detection resistor 14, and an isolator 15. The slave unit 2 includes a slave unit main circuit 21, a slave unit sub circuit 22, and an isolator 23.
In the base unit 1, the base unit main circuit 12 includes a primary power supply circuit 12_1, a base unit main power supply circuit 12_2, a CPU12_3, and a current control circuit 12_ 4. The master-slave circuit 13 includes a communication driver 13_1, a master-slave power supply circuit 13_2, and a parallel regulator 13_ 3.
In the main unit main circuit 12, the primary power supply circuit 12_1 generates a primary power supply voltage V1 from the current I supplied via the two-wire transmission path L. The mother set main power supply circuit 12_2 receives the primary power supply voltage V1 supplied from the primary power supply circuit 12_1, and generates a power supply voltage (main power supply voltage) V2 to the CPU12_ 3.
In the master-slave circuit 13, the parallel regulator 13_3 generates a power supply voltage (constant voltage) V4 to the master-slave power supply circuit 13_2, and the master-slave power supply circuit 13_2 generates a power supply voltage V5 to the communication driver 13_ 1. In the present embodiment, as the parallel regulator 13_3, a constant voltage diode ZD1 is used.
In the mother unit 1, the current detection resistor 14 detects the value of the current I returned to the two-wire transmission path L as the voltage value Vpv. The isolator 15 is provided between the main unit main circuit 12 and the sub-unit main circuit 13, and transmits and receives digital data between the CPU12_3 and the communication driver 13_1 in an insulated manner. In the present embodiment, a digital isolator using magnetic coupling of coils facing each other through an insulator is used as the isolator 15.
In the slave unit 2, the slave unit main circuit 21 includes a slave unit main power supply circuit 21_1, a CPU21_2, an a/D converter 21_3, and a sensor 21_ 4. The slave unit sub-circuit 22 includes a communication driver 22_1, a slave unit sub-power supply circuit 22_2, and a parallel regulator 22_ 3.
In the slave main circuit 21, the slave main power supply circuit 21_1 receives the primary power supply voltage V1 supplied from the primary power supply circuit 12_1 of the master 1, and generates a power supply voltage (main power supply voltage) V3 to the CPU21_ 2.
In the slave unit sub-circuit 22, the parallel regulator 22_3 generates a power supply voltage (constant voltage) V6 to the slave unit sub-power supply circuit 22_2, and the slave unit sub-power supply circuit 22_2 generates a power supply voltage V7 to the communication driver 22_ 1. In the present embodiment, a constant voltage diode ZD2 is used as the parallel regulator 22_ 3.
In the slave unit 2, the isolator 23 is provided between the slave unit main circuit 21 and the slave unit sub circuit 22, and transmits and receives digital data between the CPU21_2 and the communication driver 22_1 in an insulated manner. In the present embodiment, a digital isolator using magnetic coupling of coils facing each other through an insulator is used as the isolator 23.
In the two-wire process apparatus 100, the sensor 21_4 of the slave unit 2 is, for example, a pressure sensor. The measurement value (analog value) in the sensor 21_4 is converted into a digital value by the a/D converter 21_3 and sent to the CPU21_ 2. The CPU21_2 sends the measurement value from the a/D converter 21_3 to the communication driver 22_1 through the isolator 23. The communication driver 22_1 transmits the measurement value transmitted from the CPU21_2 to the base unit 1 as data.
The data (measurement value) transmitted from the slave unit 2 is received by the communication driver 13_1 in the master unit 1, and is taken in by the CPU12_3 through the isolator 15. The CPU12_3 sends the fetched data to the current control circuit 12_ 4. The current control circuit 12_4 receives a voltage value Vpv indicating the value of the current I detected by the current detection resistor 14, and adjusts the value of the current I returned to the two-wire transmission path L so that the voltage value Vpv becomes a voltage value corresponding to the data transmitted from the CPU12_3 (a voltage value corresponding to the received data).
In the two-wire process apparatus 100, a power supply voltage (constant voltage) V4 is supplied from the parallel regulator 13_3 at the master 1 side to the master-slave power supply circuit 13_2, and the master-slave power supply circuit 13_2 supplies the power supply voltage V5 to the communication driver 13_1 at the master 1 side. In addition, the power supply voltage (constant voltage) V6 is supplied from the parallel regulator 22_3 on the handset 2 side to the handset sub power supply circuit 22_2, and the handset sub power supply circuit 22_2 supplies the power supply voltage V7 to the communication driver 22_1 on the handset 2 side.
At this time, the parallel regulator 13_3 at the base unit 1 generates the power supply voltage V4 to the base unit sub power supply circuit 13_2 by the current IM used in the base unit main circuit 12 and returned to the two-wire transmission path L via the current detection resistor 14, and the parallel regulator 22_3 at the slave unit 2 generates the power supply voltage V6 to the slave unit sub power supply circuit 22_2 by the current IS used in the slave unit main circuit 21 and returned to the two-wire transmission path L via the current detection resistor 14.
Thus, in the two-wire process apparatus 100 according to the present embodiment, the currents (IM, IS) used in the main circuits of the master and slave units can be used for the communication between the master and slave units, and the current consumed for the communication between the master 1 and slave unit 2 can be secured without sacrificing the current consumed in other places.
In the above embodiment, the current control circuit 12_4 is provided in the main unit main circuit 12, but the current control circuit 12_4 may be provided at the main unit sub-circuit 13 side as in the two-wire process apparatus 100(100B) shown in fig. 2.
In this case, the isolator 15 between the CPU12_3 and the communication driver 13_1 is taken as the first isolator 15_1, and the second isolator 15(15_2) is provided between the CPU12_3 and the current control circuit 12_ 4.
In the above embodiment, the master unit 1 and the slave units 2 are described as 1: 1 (see fig. 3), but in the case of the master 1 and the slave 2, 1: n (N.gtoreq.2) (see FIG. 4) may be similarly configured.
In the above-described embodiment, the digital isolators 15 and 23 are used, which utilize magnetic coupling of coils facing each other through an insulator, but digital isolators such as photocouplers may be used.
In the above-described embodiment, the constant voltage diodes ZD1, ZD2 are used as the parallel regulators 13_3, 22_3, but the parallel regulator used in the present invention is not limited to the constant voltage diodes.
In the above embodiment, the case where data is transmitted from the communication driver 22_1 to the communication driver 13_1 has been described, but a command from a higher-level device may be transmitted from the communication driver 13_1 to the communication driver 22_ 1.
[ extension of embodiment ]
The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. The configuration and details of the present invention may be modified in various ways as understood by those skilled in the art within the scope of the technical idea of the present invention.
Description of the symbols
1 … mother set, 2 … child set, 12 … mother set main circuit, 12_1 … primary power supply circuit, 12_2 … mother set main power supply circuit, 12_3 … CPU, 12_4 … current control circuit, 13 … mother set secondary circuit, 13_1 … communication driver, 13_2 … mother set secondary power supply circuit, 13_3 … parallel regulator, 14 … current detection resistor, 15(15_1, 15_2), 23 … isolator, 21 … child set main circuit, 21_1 … child set main power supply circuit, 21_2 … CPU, 21_3 … a/D converter, 21_4 … sensor, 22 … child set secondary circuit, 22_1 … communication driver, 22_2 … child set secondary power supply circuit, 22_3 … parallel regulator, 100(100A, 100B) … two-wire process device.
Claims (5)
1. A two-wire processing apparatus includes:
a primary power supply circuit configured to generate a power supply voltage from a current supplied via a two-wire transmission path;
a master main power supply circuit configured to receive a power supply voltage supplied from the primary power supply circuit and generate a main power supply voltage used in the master;
a slave unit main power supply circuit configured to receive the power supplied from the primary power supply circuit and generate a main power supply voltage used by the slave unit; and
a current detection resistor that detects a value of a current returned to the two-wire transmission path,
the two-wire process apparatus is characterized in that the master unit receives data transmitted from the slave unit and adjusts the value of the current detected by the current detection resistor based on the received data,
the master is provided with:
a main circuit of a main unit including the primary power supply circuit, the main power supply circuit of the main unit, and a main-unit-side arithmetic processing unit configured to operate by receiving a power supply voltage supplied from the main power supply circuit of the main unit;
a master-slave circuit including a master-slave communication driver, a master-slave power supply circuit, and a master-slave parallel regulator, the master-slave communication driver being configured to transmit and receive data to and from the slave units, the master-slave power supply circuit being configured to generate a power supply voltage to the master-slave communication driver, the master-slave parallel regulator being configured to generate a power supply voltage to the master-slave power supply circuit; and
a parent-side isolator configured to transmit and receive digital data between the parent-side arithmetic processing unit and the parent-side communication driver in an insulated manner,
the slave unit includes:
a slave unit main circuit including the slave unit main power supply circuit and a slave unit-side arithmetic processing unit configured to operate by receiving a power supply voltage supplied from the slave unit main power supply circuit;
a slave unit sub-circuit including a slave unit-side communication driver, a slave unit sub-power supply circuit, and a slave unit-side parallel regulator, the slave unit-side communication driver being configured to transmit and receive data to and from the master unit, the slave unit sub-power supply circuit being configured to generate a power supply voltage to the slave unit-side communication driver, the slave unit-side parallel regulator being configured to generate a power supply voltage to the slave unit sub-power supply circuit; and
an isolator on the slave side configured to transmit and receive digital data between the arithmetic processing unit on the slave side and the communication driver on the slave side in an insulated manner,
the parallel regulator on the parent terminal generates a power supply voltage to the parent-machine sub-power supply circuit by using a current used in the parent-machine main circuit and returned to the two-wire transmission path via the current detection resistor,
the sub-unit-side parallel regulator generates a power supply voltage to the sub-unit sub-power supply circuit by using a current that is used in the sub-unit main circuit and returned to the two-wire transmission path via the current detection resistor.
2. The two-wire process arrangement according to claim 1,
the main circuit of the main unit includes:
and a current control circuit that receives a voltage value indicating a current value detected by the current detection resistor and adjusts a value of the current returned to the two-wire transmission path so that the voltage value becomes a voltage value corresponding to the received data.
3. The two-wire process device according to claim 1, wherein the two-wire process device uses the parent-end isolator as a first parent-end isolator,
the master-slave circuit includes:
a current control circuit that receives a voltage value indicating a current value detected by the current detection resistor and adjusts a value of a current returned to the two-wire transmission path so that the voltage value becomes a voltage value corresponding to the received data,
the master is provided with:
and a second parent-side isolator configured to transmit digital data from the parent-side arithmetic processing unit to the current control circuit in an insulated manner.
4. The two-wire process apparatus according to any one of claims 1 to 3,
the isolator on the parent side and the isolator on the child side are digital isolators using magnetic coupling of coils facing each other with an insulator interposed therebetween.
5. The two-wire process apparatus according to any one of claims 1 to 4,
the master unit is provided with a plurality of slave units.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-129755 | 2018-07-09 | ||
| JP2018129755A JP7156839B2 (en) | 2018-07-09 | 2018-07-09 | 2-wire process equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110707678A true CN110707678A (en) | 2020-01-17 |
| CN110707678B CN110707678B (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910567270.3A Active CN110707678B (en) | 2018-07-09 | 2019-06-27 | Double-line process device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7156839B2 (en) |
| CN (1) | CN110707678B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6480199A (en) * | 1987-09-22 | 1989-03-27 | Harman Co Ltd | Transmitter-receiver |
| JP2008227081A (en) * | 2007-03-12 | 2008-09-25 | Omron Corp | Magnetic coupler element and magnetic coupling type isolator |
| JP2008269567A (en) * | 2007-03-29 | 2008-11-06 | Yokogawa Electric Corp | Two-wire transmitter |
| CN101351687A (en) * | 2005-12-30 | 2009-01-21 | 罗斯芒特公司 | Power management in a process transmitter |
| CN102447389A (en) * | 2010-10-05 | 2012-05-09 | 横河电机株式会社 | Two-wire transmitter |
| JP2013097520A (en) * | 2011-10-31 | 2013-05-20 | Yokogawa Electric Corp | Two-wire transmitter |
| KR101658379B1 (en) * | 2016-04-14 | 2016-09-21 | (주)클라루스코리아 | Power Saving 2-Wire Type Control Device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62203450U (en) * | 1986-06-17 | 1987-12-25 | ||
| JP6480199B2 (en) | 2015-01-29 | 2019-03-06 | 特種東海製紙株式会社 | Printing paper |
-
2018
- 2018-07-09 JP JP2018129755A patent/JP7156839B2/en active Active
-
2019
- 2019-06-27 CN CN201910567270.3A patent/CN110707678B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6480199A (en) * | 1987-09-22 | 1989-03-27 | Harman Co Ltd | Transmitter-receiver |
| CN101351687A (en) * | 2005-12-30 | 2009-01-21 | 罗斯芒特公司 | Power management in a process transmitter |
| JP2008227081A (en) * | 2007-03-12 | 2008-09-25 | Omron Corp | Magnetic coupler element and magnetic coupling type isolator |
| JP2008269567A (en) * | 2007-03-29 | 2008-11-06 | Yokogawa Electric Corp | Two-wire transmitter |
| CN102447389A (en) * | 2010-10-05 | 2012-05-09 | 横河电机株式会社 | Two-wire transmitter |
| JP2013097520A (en) * | 2011-10-31 | 2013-05-20 | Yokogawa Electric Corp | Two-wire transmitter |
| KR101658379B1 (en) * | 2016-04-14 | 2016-09-21 | (주)클라루스코리아 | Power Saving 2-Wire Type Control Device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110707678B (en) | 2023-02-28 |
| JP2020009158A (en) | 2020-01-16 |
| JP7156839B2 (en) | 2022-10-19 |
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