CN210983125U

CN210983125U - 16-path high-precision analog voltage output module

Info

Publication number: CN210983125U
Application number: CN201922441142.2U
Authority: CN
Inventors: 单文盛; 王晟磊
Original assignee: Hunan Normal University
Current assignee: Hunan Normal University
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-07-10
Anticipated expiration: 2029-12-30

Abstract

The utility model provides a 16 way high accuracy analog quantity voltage output module, first opto-coupler unit, the second opto-coupler unit, third opto-coupler unit and fourth opto-coupler unit are connected respectively on input interface, first opto-coupler unit output is connected with the chip selection end of first digital-to-analog converter, second opto-coupler unit output is connected with the chip selection end of second digital-to-analog converter, third opto-coupler unit output is connected with the clock input end of first digital-to-analog converter and second digital-to-analog converter, fourth opto-coupler unit output is connected with the data input part of first digital-to-analog converter and second digital-to-analog converter, the output of first digital-to-analog converter and second digital-to-analog converter is connected with a set of amplifier unit respectively, 16 output of group amplifier unit are connected with output interface respectively, power supply unit is used. The utility model discloses a circuit design mode of opto-coupler cooperation digital analog converter and amplifying unit can reduce voltage fluctuation in the transmission to the at utmost, reduces the production of transmission error.

Description

16-path high-precision analog voltage output module

Technical Field

The utility model discloses an interface module, especially a 16 way high accuracy analog voltage output modules.

Background

Based on the international standard PROFIBUS field bus technology, the field bus is a field bus with a multi-master-slave structure and has the following characteristics: (1) predictable real-time: the PROFIBUS technology adopts a master-slave polling mode, and slave stations cannot actively send data, so that collision can be completely avoided, the maximum waiting time of each station can be predicted, and the PROFIBUS technology has extremely high real-time performance. (2) And high reliability: the predictable real-time property ensures the reliability, and in addition, the PROFIBUS technology is a communication mode based on reliable connection, and is combined with a master station active request mode, errors occurring at any stage can be transmitted within a determined time through diagnosis, and the reliability is higher. For the output module, an error processing strategy is also provided, so that when the module is electrified and initialized and communication is interrupted or in error, the module outputs the default output value set during configuration, and the safety of the whole system is ensured. (3) And high speed: the baud rate support of the system is from 9600 to 12M, and the requirement on the speed can be completely met. (4) Ease of use: the physical layer of the PROFIBUS bus protocol adopts 485 buses as transmission media, only has two lines, the longest length of each section of line can reach 300 meters under the speed of 10M, if a lower baud rate is adopted, the distance can be lengthened, and a powerful configuration tool is added, so that the connection of the whole system becomes very simple, in addition, the module supports the baud rate self-adaption function, the baud rate can be dynamically changed, and the use is very convenient. (5) Flexibility: the system adopts a variable configuration mode, can be large or small in scale, and can meet the requirements of various systems.

The PROFIBUS fieldbus technology is generally equipped with L INK modules to work in cooperation with I/O modules, which are classified into various types according to their uses and scales.

Disclosure of Invention

To the shortcoming that the IO module among the above-mentioned prior art can cause the transmission error in the use, the utility model provides a 16 way high accuracy analog quantity voltage output module, its circuit design who adopts opto-coupler cooperation digital analog converter and amplifying unit can reduce voltage fluctuation in the transmission in the at utmost, reduces the production of transmission error.

The utility model provides a technical scheme that its technical problem adopted is: a16-path high-precision analog quantity voltage output module comprises an input interface, a first optical coupling unit, a second optical coupling unit, a third optical coupling unit, a fourth optical coupling unit, a first digital-to-analog converter, a second digital-to-analog converter, an output interface, a power supply unit and 16 groups of amplifier units, wherein the first optical coupling unit, the second optical coupling unit, the third optical coupling unit and the fourth optical coupling unit are respectively connected to the input interface, the output end of the first optical coupling unit is connected with a chip selection end of the first digital-to-analog converter, the output end of the second optical coupling unit is connected with a chip selection end of the second digital-to-analog converter, the output end of the third optical coupling unit is connected with clock input ends of the first digital-to-analog converter and the second digital-to-analog converter, the output end of the fourth optical coupling unit is connected with data input ends of the first digital-to-analog converter and the second digital-to-analog converter, and, the output ends of the 16 groups of amplifier units are respectively connected with the output interface, and the power supply unit is used for supplying power.

The utility model provides a technical scheme that its technical problem adopted further still includes:

first opto-coupler unit, second opto-coupler unit, third opto-coupler unit and fourth opto-coupler unit include the opto-coupler respectively, first phase inverter, the second phase inverter, current-limiting resistor and drop-down resistor, first phase inverter is connected on the input of opto-coupler, the second phase inverter is connected on the output of opto-coupler, series connection has current-limiting resistor between the input of first phase inverter and opto-coupler, current-limiting resistor chooses for use the resistance to be 1.5K omega's resistance, series connection has drop-down resistor between the output of second phase inverter and the ground, drop-down resistor chooses for use the resistance to be 2K omega's resistance.

The first digital-to-analog converter and the second digital-to-analog converter adopt a digital-to-analog converter with the model number of MAX 5306.

The amplifier unit comprises two operational amplifiers, the non-inverting input end of the first amplifier is connected with one output end of the first digital-to-analog converter or the second digital-to-analog converter, the inverting input end of the first amplifier is connected with a reference voltage source through a first resistor, a second resistor is connected between the inverting input end and the output end of the first amplifier in a crossing mode, the output end of the first amplifier is connected with the non-inverting input end of the second amplifier through a third resistor, the inverting input end of the second amplifier is grounded through a fourth resistor, a fifth resistor is connected between the inverting input end of the second amplifier and the output end of the second amplifier, and the output end of the second amplifier is connected with an output interface.

The reference voltage source comprises a resistor R13, a voltage stabilizing diode D2 and a capacitor C23, the resistor R13 and the voltage stabilizing diode D2 are connected between a +5V power supply and the ground in series, the capacitor C23 is connected with the voltage stabilizing diode D2 in parallel, and the common end of the resistor R13 and the voltage stabilizing diode D2 is a reference voltage output end.

And a filter capacitor group is connected between the VCC end of the input interface and the ground.

The +24V power interface in the input interface is connected with the power supply unit, and the +24V power interface is connected with a fuse F1 and a filter capacitor bank.

The power supply unit comprises a DC-DC power supply converter, a +12V power supply voltage stabilizer, a-12V power supply voltage stabilizer and a +5V power supply voltage stabilizer, wherein the DC-DC power supply converter adopts a double-output power supply converter with the model number of D241515, the +12V power supply voltage stabilizer is connected to one output end of the DC-DC power supply converter, the-12V power supply voltage stabilizer is connected to the other output end of the DC-DC power supply converter, and the +5V power supply voltage stabilizer is connected to the output end of the +12V power supply voltage stabilizer.

The utility model has the advantages that: the utility model discloses a circuit design mode of opto-coupler cooperation digital analog converter and amplifying unit can reduce voltage fluctuation in the transmission to the at utmost, reduces the production of transmission error.

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Drawings

Fig. 1 is a block diagram of the circuit of the present invention.

Fig. 2 is a schematic circuit diagram of the present invention (the fonts and labels in the drawings are too small to be clear, and fig. 2 is divided into multiple sub-circuit diagrams for display, and fig. 2 is only used for overall display).

Fig. 3 is a schematic circuit diagram of a part of the input interface unit of the present invention.

Fig. 4 is a schematic circuit diagram of the decoupling portion of the power supply of the present invention.

Fig. 5 is a schematic diagram of a group of optical coupling unit circuits in the present invention.

Fig. 6 is a schematic diagram of a circuit of a digital-to-analog converter unit according to the present invention.

Fig. 7 is a schematic diagram of a circuit of the power input portion of the present invention.

Fig. 8 is a schematic circuit diagram of the floating leg portion of the inverter of the present invention.

Fig. 9 is a schematic circuit diagram of a part of the middle reference power supply of the present invention.

Fig. 10 is a schematic diagram of a circuit of a power supply unit according to the present invention.

Fig. 11 is a schematic diagram of an amplifying unit circuit of the present invention.

Fig. 12 is a schematic diagram of the circuit of the output interface part according to the present invention.

Detailed Description

The embodiment is a preferred embodiment of the present invention, and other principles and basic structures are the same as or similar to those of the embodiment, and are within the protection scope of the present invention.

Please refer to fig. 1 to 12 in combination, the present invention mainly includes an input interface, a first optical coupling unit, a second optical coupling unit, a third optical coupling unit, a fourth optical coupling unit, a first digital-to-analog converter, a second digital-to-analog converter, an output interface, a power supply unit, and 16 amplifier units, wherein the first optical coupling unit, the second optical coupling unit, the third optical coupling unit, and the fourth optical coupling unit are respectively connected to the input interface, data information is input to the first optical coupling unit, the second optical coupling unit, the third optical coupling unit, and the fourth optical coupling unit through the input interface, an output end of the first optical coupling unit is connected to a chip selection end (or called as an enable end) of the first digital-to-analog converter, a chip selection signal is output to the first digital-to-analog converter, so as to control the operation of the first digital-to-analog converter, an output end of the second optical coupling unit is connected to a chip selection end (or called as an enable end, the working of the digital-to-analog converter is controlled, the output end of the third optical coupling unit is connected with the clock input ends of the first digital-to-analog converter and the second digital-to-analog converter, the output end of the fourth optical coupling unit is connected with the data input ends of the first digital-to-analog converter and the second digital-to-analog converter, the output ends of the first digital-to-analog converter and the second digital-to-analog converter are respectively connected with a group of amplifier units, in the embodiment, the first digital-to-analog converter and the second digital-to-analog converter adopt 8 paths of output modules, the two digital-to-analog converters output 16 paths of output, each path of output is connected with a group of amplifier units, the output.

In this embodiment, input interface adopts 48PIN interfaces for connection director, +24V power, VCC power and ground connection, in this embodiment, input +24V power through input interface and give the utility model discloses supply power.

In this embodiment, the first optical coupler unit, the second optical coupler unit, the third optical coupler unit and the fourth optical coupler unit have the same circuit structure, and the first optical coupler unit is illustrated in the drawing by taking the first optical coupler unit as an example, the first optical coupler unit includes an optical coupler U1, an inverter U6, an inverter U5, a current limiting resistor R1 and a pull-down resistor R5, in this embodiment, an optical coupler U1 selects an optical coupler with the model of HMHA281, an inverter U6 and an inverter U5 select an inverter with the model of 74HC14, 6 inverters are integrated inside, the input and output ends of each optical coupler unit are respectively connected with one, an inverter U6 is connected to the input end of the optical coupler U1, an inverter U5 is connected to the output end of the optical coupler U1, a current limiting resistor R1 is connected in series between the input ends of the inverter U6 and the optical coupler U1, a current limiting resistor R1 selects a resistor with the resistance of 1.5K Ω, a pull-down resistor R5, the pull-down resistor R5 is a resistor with a resistance of 2K omega. In this embodiment, 2 inverters with the model number of 74HC14 are selected, which is equivalent to 12 inverters, but 8 inverters are actually used, please refer to fig. 8, and the other 4 are suspended.

In the embodiment, an input end of a first optical coupling unit is connected with an I/O port P1.0 of a controller, an output end of the first optical coupling unit is connected with a chip selection end CS (or called an enabling end) of a first digital-to-analog converter and used for inputting a chip selection signal to the first digital-to-analog converter, an input end of a second optical coupling unit is connected with the I/O port P1.1 of the controller, an output end of the second optical coupling unit is connected with a chip selection end CS (or called an enabling end) of a second digital-to-analog converter and used for inputting a chip selection signal to the second digital-to-analog converter, an input end of a third optical coupling unit is connected with an I/O port P1.2 of the controller, an output end of the third optical coupling unit is connected with clock ports SC L K of the first digital-to-analog converter and the second digital-to-analog converter and used for outputting a clock signal to the first digital-to-analog converter and the second digital converter simultaneously, an input end of the fourth optical coupling unit is connected with serial data signal to the first digital-to-analog converter and the second digital converter and used for outputting a serial data signal to-analog converter when the second digital converter and the first digital converter and the second.

In this embodiment, the first digital-to-analog converter and the second digital-to-analog converter respectively adopt a digital-to-analog converter with a model number of MAX5306, 12 bits, 8 channels, low power consumption, and voltage output, and have 8 paths of output.

In this embodiment, referring to fig. 11, in this embodiment, each group of amplifier units includes two operational amplifiers, the operational amplifier is an operational amplifier chip of type L M324, a non-inverting input terminal of a first amplifier U8A is connected to one output terminal of the first digital-to-analog converter or the second digital-to-analog converter, an inverting input terminal of the first amplifier U8A is connected to a reference voltage source through a resistor R30, a resistor R38 is connected between an inverting input terminal and an output terminal of a first amplifier U8A, a positive power source terminal of the first amplifier U8A is connected to a +12V power source, a negative power source terminal of the first amplifier U8A is connected to a +12V power source, an output terminal of the first amplifier U8A is connected to a non-inverting input terminal of a second amplifier U8 45 through a resistor R39, an inverting input terminal of the second amplifier U8B is connected to a ground terminal of the second amplifier U8, and an inverting input terminal of the second amplifier U8 is connected to a second amplifier U B, and an output terminal of the second amplifier U8 is connected to a second amplifier U9685, and an output terminal of the second amplifier U968 is not connected to a second analog-to a resistor R9638, and an output terminal of the second digital-to a second analog converter unit 3638, which is connected to a resistor R6338.

Referring to fig. 9, in the present embodiment, the reference voltage source includes a resistor R13, a zener diode D2 and a capacitor C23, the resistor R13 and the zener diode D2 are connected in series between the +5V power supply and the ground, the capacitor C23 is connected in parallel with the zener diode D2, the zener diode D2 is a diode with a model of MAX6008, and a common terminal of the resistor R13 and the zener diode D2 outputs the reference voltage to the amplifier unit, the first digital-to-analog converter and the second digital-to-analog converter.

In this embodiment, a filter capacitor bank is connected between the VCC terminal of the input interface and the ground for filtering the input VCC, a +24V power interface in the input interface is connected to the power supply unit for power input, and a fuse F1 and the filter capacitor bank are connected to the +24V power interface.

In this embodiment, the power supply unit includes a DC-DC power converter, a +12V power regulator, a-12V power regulator and a +5V power regulator, the DC-DC power converter adopts a dual-output power converter with model D241515, the +12V power regulator is connected to one output terminal of the DC-DC power converter, in this embodiment, the +12V power regulator adopts a +12V power regulator with model 78L 12, the input power is regulated to +12V for power supply, the-12V power regulator is connected to the other output terminal of the DC-DC power converter, in this embodiment, the-12V power regulator adopts a-12V power regulator with model 79L 12, the input power is regulated to-12V for power supply, the +5V power regulator is connected to the output terminal of the +12V power regulator, the +5V power regulator adopts a +5V power regulator with model 78L 05, the input power is regulated to +5V for power supply, in this embodiment, decoupling capacitors are connected between the +12V power supply and the ground (decoupling capacitors are connected to decoupling capacitors, and the decoupling capacitors are connected in parallel to the positive and the parasitic coupling circuit is prevented from being connected by more than 2 capacitors.

In this embodiment, the output interface is a 48PIN interface, and the output ends of the 16 sets of amplifier units are respectively connected with the output interface to output signals.

The utility model discloses when using, cooperation L INK module and controller use, convert the serial digital signal of controller output to 16 way analog signal and export.

The utility model discloses a circuit design mode of opto-coupler cooperation digital analog converter and amplifying unit can reduce voltage fluctuation in the transmission to the at utmost, reduces the production of transmission error.

Claims

1. A16-path high-precision analog voltage output module is characterized in that: the voltage output module comprises an input interface, a first optical coupler unit, a second optical coupler unit, a third optical coupler unit, a fourth optical coupler unit, a first digital-to-analog converter, a second digital-to-analog converter, an output interface, a power supply unit and 16 groups of amplifier units, wherein the first optical coupler unit, the second optical coupler unit, the third optical coupler unit and the fourth optical coupler unit are respectively connected to the input interface, the output end of the first optical coupler unit is connected with the chip selection end of the first digital-to-analog converter, the output end of the second optical coupler unit is connected with the chip selection end of the second digital-to-analog converter, the output end of the third optical coupler unit is connected with the clock input ends of the first digital-to-analog converter and the second digital-to-analog converter, the output end of the fourth optical coupler unit is connected with the data input ends of the first digital-to-analog converter and the second digital-to-, the output ends of the 16 groups of amplifier units are respectively connected with the output interface, and the power supply unit is used for supplying power.

2. The 16-way high-precision analog voltage output module of claim 1, wherein: first opto-coupler unit, second opto-coupler unit, third opto-coupler unit and fourth opto-coupler unit include the opto-coupler respectively, first phase inverter, the second phase inverter, current-limiting resistor and drop-down resistor, first phase inverter is connected on the input of opto-coupler, the second phase inverter is connected on the output of opto-coupler, series connection has current-limiting resistor between the input of first phase inverter and opto-coupler, current-limiting resistor chooses for use the resistance to be 1.5K omega's resistance, series connection has drop-down resistor between the output of second phase inverter and the ground, drop-down resistor chooses for use the resistance to be 2K omega's resistance.

3. The 16-way high-precision analog voltage output module of claim 1, wherein: the first digital-to-analog converter and the second digital-to-analog converter adopt a digital-to-analog converter with the model number of MAX 5306.

4. The 16-way high-precision analog voltage output module of claim 1, wherein: the amplifier unit comprises two operational amplifiers, the non-inverting input end of the first amplifier is connected with one output end of the first digital-to-analog converter or the second digital-to-analog converter, the inverting input end of the first amplifier is connected with a reference voltage source through a first resistor, a second resistor is connected between the inverting input end and the output end of the first amplifier in a crossing mode, the output end of the first amplifier is connected with the non-inverting input end of the second amplifier through a third resistor, the inverting input end of the second amplifier is grounded through a fourth resistor, a fifth resistor is connected between the inverting input end of the second amplifier and the output end of the second amplifier, and the output end of the second amplifier is connected with an output interface.

5. The 16-way high-precision analog voltage output module of claim 4, wherein: the reference voltage source comprises a resistor R13, a voltage stabilizing diode D2 and a capacitor C23, the resistor R13 and the voltage stabilizing diode D2 are connected between a +5V power supply and the ground in series, the capacitor C23 is connected with the voltage stabilizing diode D2 in parallel, and the common end of the resistor R13 and the voltage stabilizing diode D2 is a reference voltage output end.

6. The 16-way high-precision analog voltage output module of claim 1, wherein: and a filter capacitor group is connected between the VCC end of the input interface and the ground.

7. The 16-way high-precision analog voltage output module of claim 1, wherein: the +24V power interface in the input interface is connected with the power supply unit, and the +24V power interface is connected with a fuse F1 and a filter capacitor bank.

8. The 16-way high-precision analog voltage output module of claim 1, wherein: the power supply unit comprises a DC-DC power supply converter, a +12V power supply voltage stabilizer, a-12V power supply voltage stabilizer and a +5V power supply voltage stabilizer, wherein the DC-DC power supply converter adopts a double-output power supply converter with the model number of D241515, the +12V power supply voltage stabilizer is connected to one output end of the DC-DC power supply converter, the-12V power supply voltage stabilizer is connected to the other output end of the DC-DC power supply converter, and the +5V power supply voltage stabilizer is connected to the output end of the +12V power supply voltage stabilizer.