CN216052685U

CN216052685U - Four-way analog input AD collector

Info

Publication number: CN216052685U
Application number: CN202122576187.8U
Authority: CN
Inventors: 田志刚; 候高鹏
Original assignee: Hainan Wanhai Technology Co ltd
Current assignee: Hainan Wanhai Technology Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-03-15
Anticipated expiration: 2031-10-25

Abstract

The utility model relates to a four-path analog quantity input AD collector, which comprises a machine shell and a control circuit, wherein the control circuit comprises a central processing module U1, an analog-to-digital conversion module U3, a communication interface module U4, a first optical coupling isolation module U6, a second optical coupling isolation module U7 and a third optical coupling isolation module U8, the input end of the central processing module U1 is connected with the output end of the analog-to-digital conversion module U3, and the output end of the central processing module U1 is respectively connected with an analog-to-digital conversion module U3, a first optical coupling isolation module U6 and a second optical coupling isolation module U7; the output ends of the analog-to-digital conversion module U3, the first optical coupling isolation module U6, the second optical coupling isolation module U7 and the third optical coupling isolation module U8 are connected with the communication interface module U4. The four-channel analog quantity input AD collector can directly read millivolt signals of four channels of sensors at the same time and carry out analog-to-digital conversion and output, and has the advantages of high conversion rate, highest display precision, strong anti-jamming capability, low bit error rate and the like.

Description

Four-way analog input AD collector

Technical Field

The utility model relates to the field of electrical communication, in particular to a four-path analog input AD collector.

Background

An AD harvester is a common modular electrical component used for remote data collection. The existing AD collector firstly amplifies a millivolt signal by an external amplifying circuit to 0-5V, then converts the millivolt signal into a digital signal by an AD converter, a singlechip reads digital quantities from internal registers of the AD converter, and data collection and control of remote analog quantity and on/off equipment can be realized by the converted digital quantities through RS-485, so that data collection of the remote analog quantity is realized. The multi-channel analog quantity input AD collector used at present is easy to generate wrong AD values due to the fact that the problem of circuit structure design is solved, conversion precision is low, and in addition, an amplifying circuit is needed when millivolt signals such as weighing sensors are collected, so that the circuit structure is complex and bloated, and cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model provides a four-way analog quantity input AD collector, which can directly read millivolt signals of four-way sensors and perform analog-to-digital conversion output and has the advantages of high conversion rate, highest display precision, strong anti-jamming capability, low error rate and the like.

The four-path analog quantity input AD collector comprises a machine shell and a control circuit arranged in the machine shell, wherein the control circuit comprises a central processing module U1, an analog-to-digital conversion module U3, a communication interface module U4, a first optical coupling isolation module U6, a second optical coupling isolation module U7 and a third optical coupling isolation module U8, the input end of the central processing module U1 is connected with the output end of the analog-to-digital conversion module U3, and the output end of the central processing module U1 is respectively connected with the analog-to-digital conversion module U3, the first optical coupling isolation module U6 and the second optical coupling isolation module U7; the output ends of the analog-to-digital conversion module U3, the first optical coupling isolation module U6, the second optical coupling isolation module U7 and the third optical coupling isolation module U8 are connected with the communication interface module U4.

Specifically, the shell is provided with four channels of sensing module channel interfaces, a communication interface, an indicator lamp panel and a power switch; the four-channel sensing module channel interface is connected with the input end of an analog-to-digital conversion module U3 of the control circuit in the shell, and the communication interface is connected with the output end of a communication interface module U4 of the control circuit in the shell; the power switch is used for being connected with an external power supply.

Specifically, the model of the central processing module U1 is STC12C5a60S2, the model of the analog-to-digital conversion module U3 is AD7193, the model of the first optical isolator U6 is 6N137, the model of the second optical isolator U7 is 6N137, the model of the third optical isolator U8 is 6N137, and the model of the communication interface unit U4 is 65LBC 185.

In particular to the connection of the modules,

the central processing module U1 has pins 11-13 connected to the

output end

3, 27, 28 of the A/D conversion module U3 for data acquisition, the A/D conversion module U3 has

pins

11, 12 connected to the external sensing module via the terminal J2 for acquiring one analog signal, the A/D conversion module U3 has

pins

13, 14 connected to the external sensing module via the terminal J4 for acquiring one analog signal, the A/D conversion module U3 has

pins

15, 16 connected to the external sensing module via the terminal J3 for acquiring one analog signal, and the A/D conversion module U3 has

pins

17, 18 connected to the external sensing module via the terminal J1 for acquiring one analog signal;

pins

10, 39 and 4 of the central processing module U1 are respectively connected with pins 3 of a first optical coupling isolation module U6, a second optical coupling isolation module U7 and a third optical coupling isolation module U8, pins 6 of the first optical coupling isolation module U6, the second optical coupling isolation module U7 and the third optical coupling isolation module U8 are respectively connected with

pins

2, 1 and 4 of a communication interface module U4, and

pins

6 and 7 of the communication interface module U4 are communicated with an external serial port through a J9 terminal;

40-44, 34-37 and 22-25 of the central processing module U1 are in pin connection with the indicator lamp panel; the pin 8 of the central processing module U1 is connected with a communication normal light LED20, and the pin 9 of the central processing module U1 is connected with a power-on indicator light LED 21;

pins

14 and 15 of the central processing module U1 are connected with

pins

1 and 2 of a crystal oscillator Y1, a pin 38 of the central processing module U1 is connected with a power supply VCC, and a pin 16 of the central processing module U1 is grounded; an external dc24V power supply supplies power to the control circuit through a power switch on the chassis via port J0.

Specifically, in the peripheral circuit of the analog-digital conversion module,

pins

22 and 23 of the analog-digital conversion module U3 are grounded, pin 20 of the analog-digital conversion module U3 is grounded through a resistor R8 and is connected with pin 19 of the analog-digital conversion module U3 through an electrolytic capacitor E2, pin 19 of the analog-digital conversion module U3 is connected with a power supply VCC through resistors R7 and R5 which are connected in series, and the common end of the resistors R7 and R5 is grounded through a resistor R6.

Specifically, the analog-to-digital conversion module and the single-intersubular circuit are designed, the analog-to-digital conversion module U3 is connected with a terminal J1 through an intermediate connection circuit, specifically, an electrolytic capacitor E302 and a capacitor C310 are connected between

pins

17 and 18 of the analog-to-digital conversion module U3, the positive end of the electrolytic capacitor E302 is connected with a grounding capacitor C309, the negative end of the electrolytic capacitor E302 is connected with a grounding capacitor C308, the positive end of the electrolytic capacitor E302 is connected with a pin 1 of a terminal J3 through a series resistor CZ304, the negative end of the electrolytic capacitor E302 is connected with a pin 2 of the terminal J1 through series resistors R301 and CZ303, grounding capacitors C307 and C305 are arranged between the resistors R302 and R301, the

pins

1 and 2 of the terminal J1 are grounded through resistors R306 and R305 respectively, the pin 3 of the terminal J1 is connected with a ground wire PE, the

pins

5 and 6 of the terminal J1 are connected with the capacitor C303 indirectly, and the pin 4 of the terminal J1 is connected with a power supply capacitor C302 and a power supply in parallel through a fuse F3 and a VCC 302 which are connected in series, The electrolytic capacitor E301 is grounded.

Furthermore,

pins

15, 16/14, 13/12, and 11 of the analog-to-digital conversion module U3 are connected to terminals J3, J2, and J4, respectively, via intermediate circuits.

Specifically, the alarm lamp and the indicator lamp are designed and connected, the indicator lamp panel comprises an insulating circuit board and five fault EF alarm lamps LED8, LED7, LED6, LED5 and LED4 which are connected with 40-44 pins of a central processing module U1 through resistors, four fault E1 alarm lamps LED13, LED14, LED15 and LED16 which are connected with 34-37 pins of the central processing module U1, communication address indicator lamps LED27, LED24, LED25 and LED26 are connected with 22-25 pins of the central processing module U1, and the LED lamps are all connected with a power supply VCC.

The four-channel analog quantity input AD collector can directly read millivolt signals of four channels of sensors at the same time, perform analog-to-digital conversion and output, and can communicate with a plurality of devices through the 485 communication bus and the external network module.

Drawings

The four-way analog input AD collector of the utility model is further explained by combining the attached drawings as follows:

FIG. 1 is a schematic diagram of a side-front view external structure of the four-channel analog input AD collector;

FIG. 2 is a schematic diagram of the external structure of the four-way analog input AD collector at the side and rear viewing angles;

FIG. 3 is a circuit diagram of the control circuit of the four-way analog input AD collector;

FIG. 4 is a partial enlarged view of portion A of FIG. 3;

FIG. 5 is a partial enlarged view of the portion B in FIG. 3;

FIG. 6 is a partial enlarged view of the portion C in FIG. 3;

fig. 7 is a partially enlarged view of a portion D in fig. 3.

In the figure:

the device comprises a shell 1, a sensing module 2, a channel interface 3, a communication interface 4, an indicator panel and a power switch 5.

Detailed Description

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "left", "right", "front", "back", "top", "bottom", "inner", "outer", etc., indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

The technical solution of the present invention is further described by the following specific examples, but the scope of the present invention is not limited to the following examples.

Embodiment 1: as shown in fig. 1 to 3, the four-channel analog input AD collector includes a housing 1 and a control circuit disposed inside the housing 1, where the control circuit includes a central processing module U1, an analog-to-digital conversion module U3, a communication interface module U4, a first optical coupling isolation module U6, a second optical coupling isolation module U7, and a third optical coupling isolation module U8, an input end of the central processing module U1 is connected to an output end of the analog-to-digital conversion module U3, and an output end of the central processing module U1 is connected to the analog-to-digital conversion module U3, the first optical coupling isolation module U6, and the second optical coupling isolation module U7, respectively; the output ends of the analog-to-digital conversion module U3, the first optical coupling isolation module U6, the second optical coupling isolation module U7 and the third optical coupling isolation module U8 are connected with the communication interface module U4.

The shell 1 is provided with four sensing module channel interfaces 2, a communication interface 3, an indicator lamp panel 4 and a power switch 5; the four-channel sensing module channel interface 2 is connected with the input end of an analog-to-digital conversion module U3 of the control circuit in the case 1, and the communication interface 3 is connected with the output end of a communication interface module U4 of the control circuit in the case 1; the power switch 5 is used for connecting with an external power supply.

The model of the central processing module U1 is STC12C5A60S2, the model of the analog-to-digital conversion module U3 is AD7193, the model of the first optical coupler isolator U6 is 6N137, the model of the second optical coupler isolator U7 is 6N137, the model of the third optical coupler isolator U8 is 6N137, and the model of the communication interface unit U4 is 65LBC 185.

Embodiment 2: as shown in fig. 3 to 7, in the four-channel analog input AD collector, pins 11 to 13 of a central processing module U1 are respectively connected to

output terminals

3, 27, and 28 of an analog-to-digital conversion module U3 for data collection,

pins

11 and 12 of an input terminal of an analog-to-digital conversion module U3 are connected to an external sensing module through a terminal J2 for collecting one channel of analog signals,

pins

13 and 14 of an input terminal of an analog-to-digital conversion module U3 are connected to the external sensing module through a terminal J4 for collecting one channel of analog signals,

pins

15 and 16 of an input terminal of an analog-to-digital conversion module U3 are connected to the external sensing module through a terminal J3 for collecting one channel of analog signals, and

pins

17 and 18 of an input terminal of an analog-to-digital conversion module U3 are connected to the external sensing module through a terminal J1 for collecting one channel of analog signals;

pins

2, 1 and 4 of a communication interface module U4, and

pins

6 and 7 of the communication interface module U4 are communicated with an external serial port through a J9 terminal; 40-44, 34-37 and 22-25 of the central processing module U1 are in pin connection with the indicator lamp panel 4; the pin 8 of the central processing module U1 is connected with a communication normal light LED20, and the pin 9 of the central processing module U1 is connected with a power-on indicator light LED 21;

pins

14 and 15 of the central processing module U1 are connected with

pins

1 and 2 of a crystal oscillator Y1, a pin 38 of the central processing module U1 is connected with a power supply VCC, and a pin 16 of the central processing module U1 is grounded; an external direct current 24V power supply supplies power to the control circuit through a power switch 5 on the chassis 1 via a port J0. The remaining structure and components are as described in embodiment 1, and the description will not be repeated.

Embodiment 3: as shown in fig. 4 and 6, the four-way analog input AD collector connects the

pins

22 and 23 of the analog-to-digital conversion module U3 to ground, the pin 20 of the analog-to-digital conversion module U3 to ground through the resistor R8 and to connect the pin 19 of the analog-to-digital conversion module U3 through the electrolytic capacitor E2, the pin 19 of the analog-to-digital conversion module U3 to connect the power VCC through the resistors R7 and R5 connected in series, and the common end of the resistors R7 and R5 to ground through the resistor R6. The analog-digital conversion module U3 is connected with a terminal J1 through an intermediate connection circuit, specifically, an electrolytic capacitor E302 and a capacitor C310 are connected between

pins

17 and 18 of the analog-digital conversion module U3, the positive end of the electrolytic capacitor E302 is connected with a grounded capacitor C309, the negative end of the electrolytic capacitor E302 is connected with a grounded capacitor C308, the positive end of the electrolytic capacitor E302 is connected with a pin 1 of the terminal J3 through a resistor CZ304 which is connected in series, the negative end of the electrolytic capacitor E302 is connected with a pin 2 of the terminal J1 through resistors R301 and CZ303 which are connected in series, grounded capacitors C307 and C306 and a capacitor C305 are arranged between the resistors R302 and the R301, the

pins

1 and 2 of the terminal J1 are grounded through resistors R306 and R305 respectively, a pin 3 of the terminal J1 is connected with a ground wire PE,

pins

5 and 6 of the terminal J1 are connected with the capacitor C303 indirectly, and a pin 4 of the terminal J1 is connected with a fuse F3 and an inductance coil 302 power supply and a capacitor VCC 301 which is connected in parallel with the electrolytic capacitor E302 and the ground.

Pins

15, 16/14, 13/12 and 11 of the analog-to-digital conversion module U3 are respectively connected with terminals J3, J2 and J4 through intermediate circuits. The remaining structure and components are as described in embodiment 1, and the description will not be repeated.

Embodiment 4: as shown in fig. 1 to 3, the indicator lamp panel 4 of the four-channel analog input AD collector includes an insulating circuit board, five-channel fault EF alarm lamps LED8, LED7, LED6, LED5, LED4 which are connected to pins 40 to 44 of a central processing module U1 and are mounted on the insulating circuit board through resistors, four-channel fault E1 alarm lamps LED13, LED14, LED15, LED16 which are connected to pins 34 to 37 of the central processing module U1, and communication address indicator lamps LED27, LED24, LED25, LED26 which are connected to pins 22 to 25 of the central processing module U1, and the LED lamps are all connected to a power source VCC. The remaining structure and components are as described in embodiment 1, and the description will not be repeated.

And (3) running: the utility model adopts DC24V for power supply, and one path outputs isolation voltage DC5V through an isolation power supply module to independently supply power for four paths of sensors. And the weighing sensor is respectively connected with the terminals J1-J4 according to requirements, and the signals are read and converted and then output. Specifically, the sensor outputs 0-10 mV analog voltage according to external force, the high-precision 0-10 mV voltage is output through a series of filtering of 10uH isolation inductance, 1uF, 0.1uF, 0.01uF and 100 ohm magnetic beads, the AD7193 differential analog input and the self internal clock are used, a precise reference voltage is provided for the AD7193 through a series-parallel circuit of a precise resistor 1.5K ohm and a 50 ohm resistor, the four sensors are controlled, channels are detected from 1 to 4, 0-10 mV analog signals are converted into digital signals, the digital signals are transmitted to a central processing module U1, and then the digital signals are transmitted to an upper computer through 485 isolation communication.

The four-channel analog quantity input AD collector can directly read millivolt signals of four channels of sensors at the same time and carry out analog-to-digital conversion and output, and can be communicated with a plurality of devices through a 485 communication bus and an external network module.

The foregoing description illustrates the principal features, rationale, and advantages of the utility model. It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments or examples, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The foregoing embodiments or examples are therefore to be considered in all respects illustrative and not restrictive. The scope of the utility model is indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A four-way analog input AD collector is characterized in that: comprises a casing (1) and a control circuit arranged in the casing (1), wherein the control circuit comprises a central processing module U1, an analog-to-digital conversion module U3, a communication interface module U4, a first optical coupling isolation module U6, a second optical coupling isolation module U7 and a third optical coupling isolation module U8,

the input end of the central processing module U1 is connected with the output end of the analog-to-digital conversion module U3, and the output end of the central processing module U1 is respectively connected with the analog-to-digital conversion module U3, the first optical coupling isolation module U6 and the second optical coupling isolation module U7; the output ends of the analog-to-digital conversion module U3, the first optical coupling isolation module U6, the second optical coupling isolation module U7 and the third optical coupling isolation module U8 are connected with the communication interface module U4.

2. The four-way analog input AD collector of claim 1, wherein: the shell (1) is provided with four sensing module channel interfaces (2), a communication interface (3), an indicator lamp panel (4) and a power switch (5); the four-channel sensing module channel interface (2) is connected with the input end of an analog-to-digital conversion module U3 of the internal control circuit of the shell (1), and the communication interface (3) is connected with the output end of a communication interface module U4 of the internal control circuit of the shell (1); the power switch (5) is used for being connected with an external power supply.

3. The four-way analog input AD collector of claim 2, wherein: the model of the central processing module U1 is STC12C5A60S2, the model of the analog-to-digital conversion module U3 is AD7193, the model of the first optical coupler isolator U6 is 6N137, the model of the second optical coupler isolator U7 is 6N137, the model of the third optical coupler isolator U8 is 6N137, and the model of the communication interface unit U4 is 65LBC 185.

4. The four-way analog input AD collector of claim 3, wherein:

the central processing module U1 has pins 11-13 connected to the output end 3, 27, 28 of the A/D conversion module U3 for data acquisition, the A/D conversion module U3 has pins 11, 12 connected to the external sensing module via the terminal J2 for acquiring one analog signal, the A/D conversion module U3 has pins 13, 14 connected to the external sensing module via the terminal J4 for acquiring one analog signal, the A/D conversion module U3 has pins 15, 16 connected to the external sensing module via the terminal J3 for acquiring one analog signal, and the A/D conversion module U3 has pins 17, 18 connected to the external sensing module via the terminal J1 for acquiring one analog signal;

pins 10, 39 and 4 of the central processing module U1 are respectively connected with pins 3 of a first optical coupling isolation module U6, a second optical coupling isolation module U7 and a third optical coupling isolation module U8, pins 6 of the first optical coupling isolation module U6, the second optical coupling isolation module U7 and the third optical coupling isolation module U8 are respectively connected with pins 2, 1 and 4 of a communication interface module U4, and pins 6 and 7 of the communication interface module U4 are communicated with an external serial port through a J9 terminal;

40-44, 34-37 and 22-25 of the central processing module U1 are in pin connection with the indicator lamp panel (4); the pin 8 of the central processing module U1 is connected with a communication normal light LED20, and the pin 9 of the central processing module U1 is connected with a power-on indicator light LED 21;

pins 14 and 15 of the central processing module U1 are connected with pins 1 and 2 of a crystal oscillator Y1, a pin 38 of the central processing module U1 is connected with a power supply VCC, and a pin 16 of the central processing module U1 is grounded; an external direct current 24V power supply supplies power to the control circuit through a power switch (5) on the shell (1) through a port J0.

5. The four-way analog input AD collector of claim 4, wherein: the pins 22 and 23 of the analog-to-digital conversion module U3 are grounded, the pin 20 of the analog-to-digital conversion module U3 is grounded through a resistor R8 and is connected with the pin 19 of the analog-to-digital conversion module U3 through an electrolytic capacitor E2, the pin 19 of the analog-to-digital conversion module U3 is connected with a power supply VCC through serially connected resistors R7 and R5, and the common end of the resistors R7 and R5 is grounded through a resistor R6.

6. The four-way analog input AD collector of claim 5, wherein: the analog-to-digital conversion module U3 is connected to the terminal J1 via an intermediate connection circuit, specifically,

an electrolytic capacitor E302 and a capacitor C310 are connected between pins 17 and 18 of the analog-to-digital conversion module U3, the positive end of the electrolytic capacitor E302 is connected with a grounding capacitor C309, the negative end of the electrolytic capacitor E302 is connected with a grounding capacitor C308, the positive end of the electrolytic capacitor E302 is connected with a pin 1 of a terminal J3 through a resistor CZ304 which is connected in series, the negative end of the electrolytic capacitor E302 is connected with a pin 2 of a terminal J1 through resistors R301 and CZ303 which are connected in series, grounding capacitors C307 and C306 and a capacitor C305 are arranged between the resistors R302 and R301, the pins 1 and 2 of the terminal J1 are respectively grounded through resistors R306 and R305, a pin 3 of the terminal J1 is connected with a ground wire PE, a pin 5 and a pin 6 of the terminal J1 are connected with a capacitor C303, a pin 4 of the terminal J1 is connected with a power supply VCC through a fuse F3 and an inductance coil CZ302 which are connected in series, and the capacitor C302 and the electrolytic capacitor E301 which are connected in parallel.

7. The four-way analog input AD collector of claim 6, wherein: pins 15, 16/14, 13/12 and 11 of the analog-to-digital conversion module U3 are respectively connected with terminals J3, J2 and J4 through intermediate circuits.

8. The four-way analog input AD collector of claim 7, wherein: the indicator lamp panel (4) comprises an insulating circuit board, five fault EF alarm lamps LED8, LED7, LED6, LED5 and LED4 which are arranged on the insulating circuit board through resistors and connected with pins 40-44 of a central processing module U1, four fault E1 alarm lamps LED13, LED14, LED15 and LED16 which are connected with pins 34-37 of the central processing module U1, communication address indicator lamps LED27, LED24, LED25 and LED26 which are connected with pins 22-25 of the central processing module U1, and all the LED lamps are connected with a power supply VCC.