CN201622452U - Current output device - Google Patents
Current output device Download PDFInfo
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- CN201622452U CN201622452U CN2010201042954U CN201020104295U CN201622452U CN 201622452 U CN201622452 U CN 201622452U CN 2010201042954 U CN2010201042954 U CN 2010201042954U CN 201020104295 U CN201020104295 U CN 201020104295U CN 201622452 U CN201622452 U CN 201622452U
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- output
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- fpga chip
- electric current
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Abstract
The utility model discloses a current output device, which converts the serial digital information output by a main control processor into the PWM signal through a FPGA chip to output, then insulates digital signals from analog signals through a high speed optocoupler, and then provides voltage-controlled DC analog singles through a voltage-current conversion module to output. The utility model conveniently achieves the output function of multichannel with an analog quantity ranging from 4mA to 20mA through the characteristics of abundant resources of IO of the FPGA chip, and magnifies and converts PWM signals to be 4mA to 20mA current to output. Compared with the prior art, the utility model eliminates a DA conversion link and simplifies the isolating circuit of a digital analog system; moreover, an operational amplifier and a reference power supply are internally arranged in a selected AM462 chip, so that an amplifier and a power supply are not required to be disposed.
Description
Technical field
The utility model relates to the Automatic monitoring systems field, particularly a kind of current output device.
Background technology
At present, most modular devices all require to have 4mA～20mA electric current output function in the Automatic monitoring systems.In the prior art, conventional treatment method mainly adopts special-purpose DA converter to convert the numerical information of host CPU to correspondent voltage, and through modulation circuit conditioning back output 4mA～20mA electric current, process flow diagram as shown in Figure 1.
This disposal route have a following shortcoming:
1, adopt special-purpose DA converter, production cost is higher;
2, be inconvenient to realize multichannel 4mA～20mA DC analogue quantity output;
In addition, traditional method for designing, the buffer circuit more complicated of simulation system and digital display circuit is difficult for realizing.
The utility model content
The purpose of this utility model provides a kind of current output device, and it can realize the DC simulation electric current of predetermined range value.
The utility model provides a kind of current output device, is applicable to automatic monitored control system, comprising:
Main control processor is in order to output serial digital information;
Fpga chip, its input end connect described main control processor and are pwm signal output with the serial digital information translation of its output;
Electric current and voltage modular converter, its input end receive the pwm signal of described fpga chip output, in order to a voltage-controlled DC simulation signal and output to be provided.
Described device also comprises high-speed photoelectric coupler, connects described fpga chip output terminal, in order to the isolation of digital signal and simulating signal.
Described device also comprises field effect transistor, and its input end connects the pair end of described high-speed photoelectric coupler, and its output terminal connects described electric current and voltage modular converter.
Described field effect transistor is connected described electric current and voltage modular converter by the low-pass filter of being made up of resistance and electric capacity.
Described electric current and voltage modular converter comprises multi-usage signal transmitting chip and peripheral circuit thereof.
Described multi-usage signal transmitting chip comprises the two-way amplifier, road amplifier wherein and collocation resistance thereof constitute a power supply and connect described high-speed photoelectric coupler, other No. one amplifier and collocation resistance thereof constitute linear amplifier circuit, the voltage signal that output is amplified.
Described fpga chip connects described main control processor by the SPI interface bus.
Adopt a kind of current output device described in the utility model, the serial digital information translation of main control processor being exported by fpga chip is pwm signal output, isolate digital signal and simulating signal by high-speed photoelectric coupler then, provide a voltage-controlled DC simulation signal and output by the electric current and voltage modular converter again.The utility model has been realized hyperchannel 4mA～20mA analog quantity output function easily by the resourceful characteristics of fpga chip IO, pwm signal is amplified convert 4mA～20mA electric current output to.The utility model is compared with traditional method, has saved the DA conversion links, simplified the numeral, the simulation system buffer circuit, the AM462 built-in chip type of selecting for use in addition operational amplifier and reference power source, need not additional configuration amplifier and power supply.
Description of drawings
Fig. 1 is traditional 4mA～20mA DC analogue quantity output process flow diagram;
Fig. 2 is the theory diagram of device described in the utility model;
Fig. 3 is the circuit theory diagrams of device described in the utility model.
Embodiment
Further specify the technical solution of the utility model below in conjunction with drawings and Examples.
With reference to Fig. 2, the utility model provides a kind of current output device, is applicable to automatic monitored control system, comprising:
Main control processor 110 is in order to output serial digital information.
Fpga chip U
1, its input end connects described main control processor 110 and is pwm signal output with the serial digital information translation of its output.
High-speed photoelectric coupler U
2, connect described fpga chip U
1Output terminal is in order to the isolation of digital signal and simulating signal.
Field effect transistor Q
1, its input end connects described high-speed photoelectric coupler U
2The pair end, its output terminal connects described electric current and voltage modular converter 130.Field effect transistor Q
1Be connected described electric current and voltage modular converter 130 by the low-pass filter of forming by resistance and electric capacity 120.
Electric current and voltage modular converter 130, its input end receive described fpga chip U
1The pwm signal of output is in order to provide a voltage-controlled DC simulation signal and output.Described electric current and voltage modular converter 130 comprises multi-usage signal transmitting chip and peripheral circuit thereof.
Referring to Fig. 3, as an embodiment, come the detailed circuit structure of introducing device described in the utility model below, Fig. 3 has showed the circuit theory of the described device 100 of output 4mA～20mA electric current.At first adopted the novel fpga chip U of FLASH technology
1, its simulation SPI interface receives the serial digital information of main control processor 110 (CPU), the pwm signal of the certain dutycycle of conversion output, and by high-speed photoelectric coupler U
2(model 6N137) isolation signals, thus realize effective isolation of digital display circuit and simulation system simply and easily, strengthened system's antijamming capability greatly.Because high-speed photoelectric coupler U
2During conducting, the pressure drop about 0.3V is arranged between secondary collector, the emitter, influence is regulated, so adopt field effect transistor Q
1(P channel MOS tube) eliminates the influence of tube voltage drop.Resistance R among the figure
5, capacitor C
2Constitute passive low ventilating filter 120, filtering pwm signal radio-frequency component.Electric current and voltage modular converter 130 adopts the AM462 chip U of German AMG Co.
3(multi-usage signal transmitting chip), this chip is also integrated two-way operational amplifier, wherein No. one amplifier and built-in reference voltage and resistance R
3, R
4Cooperating the power supply that constitutes 3.3V is high-speed photoelectric coupler U
2Power supply, so just need not to provide independent current source is high-speed photoelectric coupler U again
2Power supply can reduce the use of power supply apparatus, reduces design cost greatly; Other No. one amplifier and resistance R
7, R
8Constitute linear amplifier circuit, amplification voltage signal.Voltage signal after the amplification is through the DC simulation electric current of conversion output 4mA～20mA.Software is controlled the dutycycle of pwm signal according to demand, thereby realizes the size of Control current, and is more convenient, need not to be provided with in circuit zeroing elements such as potentiometer, simplified circuit design.In addition among Fig. 3, triode Q
2Play the reinforcing band loading capability, diode D
1Guarantee the correct outbound course of electric current, prevent to damage circuit because of wiring error.
Fpga chip U
1Have abundant IO resource, realize multiple output function, only need fpga chip U
1The pwm signal of other IO pins output, amplify conversion links by isolation shown in Figure 3 and can finish, convenient and practical.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, and be not to be used as qualification of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model variation, the modification of above embodiment.
Claims (7)
1. a current output device is applicable to automatic monitored control system, it is characterized in that, comprising:
Main control processor is in order to output serial digital information;
Fpga chip, its input end connect described main control processor and are pwm signal output with the serial digital information translation of its output;
Electric current and voltage modular converter, its input end receive the pwm signal of described fpga chip output, in order to a voltage-controlled DC simulation signal and output to be provided.
2. device as claimed in claim 1 is characterized in that described device also comprises high-speed photoelectric coupler, connects described fpga chip output terminal, in order to the isolation of digital signal and simulating signal.
3. device as claimed in claim 2 is characterized in that described device also comprises field effect transistor, and its input end connects the pair end of described high-speed photoelectric coupler, and its output terminal connects described electric current and voltage modular converter.
4. device as claimed in claim 3 is characterized in that, described field effect transistor is connected described electric current and voltage modular converter by the low-pass filter of being made up of resistance and electric capacity.
5. as each described device of claim 2 to 4, it is characterized in that described electric current and voltage modular converter comprises multi-usage signal transmitting chip and peripheral circuit thereof.
6. device as claimed in claim 5, it is characterized in that, described multi-usage signal transmitting chip comprises the two-way amplifier, road amplifier wherein and collocation resistance thereof constitute a power supply and connect described high-speed photoelectric coupler, other No. one amplifier and collocation resistance thereof constitute linear amplifier circuit, the voltage signal that output is amplified.
7. device as claimed in claim 6 is characterized in that described fpga chip connects described main control processor by the SPI interface bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201042954U CN201622452U (en) | 2010-01-29 | 2010-01-29 | Current output device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201042954U CN201622452U (en) | 2010-01-29 | 2010-01-29 | Current output device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201622452U true CN201622452U (en) | 2010-11-03 |
Family
ID=43025911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201042954U Expired - Lifetime CN201622452U (en) | 2010-01-29 | 2010-01-29 | Current output device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201622452U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102207740A (en) * | 2011-03-30 | 2011-10-05 | 河海大学常州校区 | Isolated multipath 4-20mA-current signal output circuit |
| CN102243503A (en) * | 2011-04-06 | 2011-11-16 | 河海大学常州校区 | Co-grounded multi-path circuit for outputting 4-20mA of current signals |
-
2010
- 2010-01-29 CN CN2010201042954U patent/CN201622452U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102207740A (en) * | 2011-03-30 | 2011-10-05 | 河海大学常州校区 | Isolated multipath 4-20mA-current signal output circuit |
| CN102243503A (en) * | 2011-04-06 | 2011-11-16 | 河海大学常州校区 | Co-grounded multi-path circuit for outputting 4-20mA of current signals |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yang Liutao Inventor after: Zhao Biao Inventor before: Zhao Biao |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: ZHAO BIAO TO: YANG LIUTAO ZHAO BIAO |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101103 |