CN203416242U - Multi-channel photoelectric-isolation D/A converter - Google Patents
Multi-channel photoelectric-isolation D/A converter Download PDFInfo
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- CN203416242U CN203416242U CN201320522405.2U CN201320522405U CN203416242U CN 203416242 U CN203416242 U CN 203416242U CN 201320522405 U CN201320522405 U CN 201320522405U CN 203416242 U CN203416242 U CN 203416242U
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- 238000002955 isolation Methods 0.000 title claims abstract description 33
- 230000005622 photoelectricity Effects 0.000 claims description 7
- 230000003321 amplification Effects 0.000 abstract description 5
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
The utility model discloses a multi-channel photoelectric-isolation D/A converter which is characterized in that the D/A converter is formed by the sequential serial connection of a central processor, a multi-channel photoelectric-isolation module, a multi-channel shunt module, and a multi-channel amplification driving module; the central processor enables the D/A values of all channels to be respectively inputted into the multi-channel photoelectric-isolation module in the form of variable pulse width modulation (PWM) signals with fixed cycles and duty ratios; the multi-channel photoelectric-isolation module enables the pulse signals of all channels to be inputted to the multi-channel shunt module after electric isolation; the multi-channel shunt module enables the pulse signals of all channels to be inputted to the multi-channel amplification driving module in the form of the pulse signals of all cycles; and the multi-channel amplification driving module enables the pulse signals of all cycles to be outputted to the control voltages of variable frequency speed regulator of all channels in the form of an analog direct-current voltage. Compared with the prior art, the converter provided by the utility model is characterized by complete isolation between an output voltage and a host, strong anti-interference capability, function of short circuit protection, and strong capability of output driving. The resolution of the output voltage and a scanning speed is convenient to set. The converter is simple in structure and low in cost.
Description
Technical field
The utility model relates to technical field of industrial automatic control, specifically a kind of D/A converter of multichannel photoelectricity isolation.
Background technology
In industrial automatic control, often data volume need to be converted to the analog quantitys such as voltage, electric current, to drive as variable-frequency governor etc., take the actuator that analog quantity is input signal.D/A conversion itself is not difficult; existing market has the D/A converter chip of polytype and precision, and difficult point is how to realize High-frequency Interference, high-power driving ability (every road driving force reaches 250mA) and the short-circuit protection of the electrical isolation between D/A converter and main frame, anti-frequency converter.
The D/A converter of prior art generally all adopts simulation isolator and main frame to carry out electrical isolation; when output way is many (what use at present is to be with 16 frequency change speed regulator for motors); as not only cost is high to adopt simulation isolator, the High-frequency Interference of anti-frequency converter, high-power driving ability and short-circuit protection, precision and the linearity are all difficult to meet control requirement.
Utility model content
The purpose of this utility model is the D/A converter of a kind of multichannel photoelectricity isolation that designs for the deficiencies in the prior art; adopt fixed cycle and variable duty ratio pulse-width modulation PWM pulse signal; this signal is through photoelectricity isolation and the amplification of filtering along separate routes; realize multichannel photoelectricity isolation D/A output; output voltage and main frame are isolated completely; the resolution of output voltage and sweep speed are by the built-in user's control sequence of CPU software set; there is short-circuit protection function and the strong feature of output driving force; simple in structure; volume is little, and cost is low.
The purpose of this utility model is achieved in that a kind of D/A converter of multichannel photoelectricity isolation, is characterized in that this D/A converter amplifies driver module by central processing unit and multichannel photoelectric isolation module, demultiplex module and multichannel and composes in series successively; Described central processing unit will be controlled time series data respectively with fixed cycle and variable duty ratio pulse-width modulation PWM signal input multichannel photoelectric isolation module, multichannel photoelectric isolation module Jiang Ge road pulse signal carries out inputting demultiplex module after electrical isolation, demultiplex module Jiang Ge road pulse signal amplifies driver module with the pulse signal input multichannel in each cycle, and multichannel is amplified driver module and the pulse signal in each cycle exported to the control voltage of each road variable-frequency governor with analog DC voltage.
The utility model compared with prior art has output voltage and the strong feature of main frame isolation completely, short-circuit protection function and output driving force; the resolution of output voltage and sweep speed are controlled sequential software set by CPU is built-in according to user; simple in structure; antijamming capability is strong; easy to use; volume is little, and cost is low.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation
Fig. 2 is for implementing illustration.
Embodiment
Consult accompanying drawing 1, the utility model amplifies driver module 4 by central processing unit 1 and multichannel photoelectric isolation module 2, demultiplex module 3 and multichannel and composes in series successively; Described central processing unit 1 Jiang Ge road D/A value is respectively with fixed cycle and variable duty ratio pulse-width modulation PWM signal input multichannel photoelectric isolation module 2, multichannel photoelectric isolation module 2 Jiang Ge road pulse signals carry out inputting demultiplex module 3 after electrical isolation, demultiplex module 3 Jiang Ge road pulse signals amplify driver module 4 with the pulse signal input multichannel in each cycle, and multichannel is amplified driver module 4 and the pulse signal in each cycle outputed to the control voltage of each road frequency change speed regulator for motor input with analog DC voltage.
The utility model is described in further detail for the specific embodiment of with 8 bit resolutions, 16 variable-frequency governors being controlled below.
Embodiment 1
Consult accompanying drawing 2, multichannel of the present utility model is amplified to driver module 4 and be connected with 16 variable-frequency governors 5.Central processing unit (C8051F120) 1 controls time series data according to user and produces pwm signal corresponding to 16 tunnel 0 ~ 5V voltage by built-in PWM pulse width modulator, pwm signal is exported a road with 26 microsecond timing-interrupt scanning mode Jiang16 road D/A values every 26 microseconds and be take precision as 15 nanoseconds, cycle is 3.858 microseconds, pulsewidth is the 3.3V positive pulse input multichannel photoelectric isolation module 2 of 0 ~ 3.858 microsecond, if resolution is 12 or 16, the corresponding cycle of its pwm signal is respectively 61.728 μ s and 987.654 μ s, and precision was for 15 nanoseconds.Multichannel photoelectric isolation module 2 is 6 road photoelectric isolation modules, the dominant frequency of its CPU is 66.3552MHz, multichannel photoelectric isolation module 2 take for 15 nanoseconds as precision to export a road every 26 microseconds, cycle is 3.858 microseconds, and pulsewidth is the 3.3V positive pulse D/A value input demultiplex module 3 of 0 ~ 3.858 microsecond.Demultiplex module 3 is comprised of two 8 tunnels (74HC4051) digital demultiplexing module, demultiplex module 3 Jiang16 road D/A value pulse signals be take 16 cycles as 3.858 microseconds, and pulsewidth is that the 5V positive pulse D/A value input multichannel of 0 ~ 3.858 microsecond is amplified driver module 4.Multichannel is amplified driver module 4 and is kept amplification module (AD8594A) to form by four 4 tunnel filtering, the filtering of every road keeps amplifying driver module according to input pulsewidth, the analog DC voltage of output D/A value 0 ~ 5V is received 16 variable-frequency governors 5, output=0V when input pulse width is 0 microsecond, output=5V when input pulse width is 3.858 microsecond, every variable-frequency governor (GOODRIV) is controlled (SBD50) alternating current machine, analog DC voltage 0V is for shutting down, analog DC voltage is that 5V motor speed is the fastest, thereby reach variable frequency regulating speed control motor rotation object.
The software advantage of the utility model application high-speed microprocessor, makes circuit structure very simple, and control rate precision is high, hardware cost is low, stable performance, reliable, and antijamming capability is strong, maintainable good, makes the performance of enterprises and social benefit reach best.
More than just the utility model is described further, not in order to limit this patent, all is that the utility model equivalence is implemented, within all should being contained in the claim scope of this patent.
Claims (1)
1. a D/A converter for multichannel photoelectricity isolation, is characterized in that this D/A converter amplifies driver module (4) by central processing unit (1) and multichannel photoelectric isolation module (2), demultiplex module (3) and multichannel and composes in series successively; Described central processing unit (1) will be controlled time series data respectively with fixed cycle and variable duty ratio pulse-width modulation PWM signal input multichannel photoelectric isolation module (2), multichannel photoelectric isolation module (2) Jiang Ge road pulse signal carries out inputting demultiplex module (3) after electrical isolation, demultiplex module (3) Jiang Ge road pulse signal amplifies driver module (4) with the pulse signal input multichannel in each cycle, and multichannel is amplified driver module (4) and the pulse signal in each cycle exported to the control voltage of each road variable-frequency governor with analog DC voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320522405.2U CN203416242U (en) | 2013-08-26 | 2013-08-26 | Multi-channel photoelectric-isolation D/A converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320522405.2U CN203416242U (en) | 2013-08-26 | 2013-08-26 | Multi-channel photoelectric-isolation D/A converter |
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| Publication Number | Publication Date |
|---|---|
| CN203416242U true CN203416242U (en) | 2014-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320522405.2U Expired - Fee Related CN203416242U (en) | 2013-08-26 | 2013-08-26 | Multi-channel photoelectric-isolation D/A converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932731A (en) * | 2019-11-12 | 2020-03-27 | 深圳信息职业技术学院 | Digital-to-analog conversion device and frequency converter speed regulation system |
-
2013
- 2013-08-26 CN CN201320522405.2U patent/CN203416242U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932731A (en) * | 2019-11-12 | 2020-03-27 | 深圳信息职业技术学院 | Digital-to-analog conversion device and frequency converter speed regulation system |
| CN110932731B (en) * | 2019-11-12 | 2020-09-25 | 深圳信息职业技术学院 | Digital-to-analog conversion device and frequency converter speed regulation system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140129 |