CN201335996Y - Low-cost high-accuracy numerical-control constant current source - Google Patents
Low-cost high-accuracy numerical-control constant current source Download PDFInfo
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- CN201335996Y CN201335996Y CNU2008202049258U CN200820204925U CN201335996Y CN 201335996 Y CN201335996 Y CN 201335996Y CN U2008202049258 U CNU2008202049258 U CN U2008202049258U CN 200820204925 U CN200820204925 U CN 200820204925U CN 201335996 Y CN201335996 Y CN 201335996Y
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Abstract
The utility model discloses a low-cost high-accuracy numerical-control constant current source which comprises a current supply module, a man-machine interface module and an SCM control module, wherein the modules are electrically connected with one another. The constant current source adopts the application-specific integrated circuit to achieve a voltage-controlled current source and adopts the SCM to control the high-accuracy pulse width modulation (PWM) to generate a D/A conversion control voltage output, thereby achieving the numerical control of the electric current. Additionally, the accurate control of the output current is achieved only by adjusting the open-loop control. Therefore, the low-cost high-accuracy numerical-control constant current source has stable performance and high loading capacity.
Description
Technical field
The utility model relates to a kind of digital-control constant-flow source circuit, particularly relates to a kind of low cost high precision numerical control constant-current source.Belong to the electric and electronic product field.
Background technology
Along with the deep development of electronic technology, various intelligence instruments are more and more, and it is more and more wider to relate to the field, and instrument is also more and more higher to the requirement of power supply.Now, power-supply device all develops towards the digitizing direction.Yet the design of the most DCPS digitally controlled power source that can see is to realize by the A/D and the D/A chip of seniority on the market, though this can obtain higher precision, but make that also cost greatly increases, and the mimic channel of electric current output is to use amplifier to add triode output (" Computer Control Technology and application " Liu Guorong, China Machine Press nothing but; " Atmega8 principle application manual " Ma Chao, publishing house of Tsing-Hua University).Precision in the whole range ability of electric current output all be by software control realize (a kind of method for designing Wang Hai of current source forever, Wu Nanjian, longevity state's beam patent No.: 200510112584.2; A kind of one road reference current drives the current source circuit Sun Hong army of multi-path parallel LEDs, the Wu Ke patent No.: 200610127716.3; The constant current source T pool Teller patent No. with EEPROM unit: 96194089).
The utility model content
The purpose of this utility model is to provide a kind of low cost high precision numerical control constant-current source.
The purpose of this utility model is achieved by the following technical programs.
A kind of low cost high precision numerical control constant-current source is characterized in that: it comprises current source module, human-machine interface module and single chip control module; Described current source module comprises XTR110 electric current loop special IC and adjusts pipe, the inside of described XTR110 electric current loop special IC has+and the 10V reference voltage provides benchmark for input end, and realize the input of various control voltage, adapt to different control voltage needs, circuit also carries output range and zero-bit adjustment, realize the linearity adjustment in the The whole control range of current, output current is not subjected to pull-up resistor control and influenced by given voltage Vin, be voltage-controlled current source, just realized the conversion of voltage to electric current, therefore, we can utilize single-chip microcomputer to change control voltage by PWM just can control the output current size, owing to used special IC, make constant current source load variations in a big way in output current all have high stability; Described human-machine interface module comprises keypad circuit and liquid crystal display circuit; Described single chip control module comprise by the MEGA8 single-chip microcomputer as the control module of control center, by one in the ATMEGA8 single-chip microcomputer sheet Timer with 16 PWM functions produce the PWM functional module of PWM waveform, the filtering circuit that constitutes by Order RC low pass passive filter (the PWM ripple can not be directly used in control metal-oxide half field effect transistor＜MOSFET after producing 〉, need it is become the DC voltage that can change with change in duty cycle, select for use Order RC low pass passive filter then to obtain good effect.Because the load capacity of passive filter is poor, attenuation ratio is severe behind the signal process second order passive filtering network, need increase the one-level power amplification circuit according to theoretical and practical experience, but comprised the computing amplification among the design among the electric current loop IC, so through can directly exporting to XTR110 behind the Order RC low pass passive filter, this also is one of characteristics of the design.), switch power module, steady pressure of system module and performance evaluation and test module; Described keypad circuit connects PD4, the PD5 pin of MEGA8 single-chip microcomputer, and liquid crystal display circuit connects MEGA8 single-chip microcomputer PC0-PC5 pin; The pwm signal of the PB1 output of MEGA8 single-chip microcomputer connects Order RC low pass passive filter, and the direct current signal of output connects 5 pin of current source module XTR110; The MEGA8 single-chip microcomputer uses internal oscillator that basic service condition is provided; After the filtering of RC low pass passive filter, change output voltage controlled variable control voltage-controlled current source by 10 PWM conversion outputs that MEGA8 single-chip microcomputer inside carries as D/A; Described performance evaluation and test module are an artificial circuit, the voltage controlled current source circuit carries out emulation by simulation software and process is carried out actual test to the model machine of producing, when the current value of given a certain setting, outputting current steadily and error control are in 1%; Electric current output in this constant current source drives output by adjusting pipe.
Described adjustment pipe adopts high-power FET IRF9540.Adopt this field effect transistor, be easier to realize the voltage linear Control current, can satisfy the requirement that the output current maximum reaches 1A, also can realize voltage approximately linear ground Control current preferably.Input voltage is 0-10V if the 5 pin ground connection of XTR110,4 pin are imported then, if Rext resistance changes 0.1 Europe into, output current scope becomes 0-10A and need not change circuit form and element, and is very flexible; Can also directly make the module external lead wire to this circuit in addition, promptly become a flexible and high-precision V/I module.Cooperate other control circuits (or even manual control circuit) can produce the constant current source that is fit to requirement fast again.
Described liquid crystal display circuit is made of LCD 1602.
For the I/O mouth of saving single-chip microcomputer and the difficulty that reduces the PCB circuit board wiring, described LCD 1602 liquid crystal display circuits adopt 4 line system modes, be that liquid crystal display circuit D0～D3 bidirectional data line is empty need not, only with four bidirectional data lines of D4～D7, the RS register is selected and the pin of E Enable Pin connects single-chip microcomputer, RW read-write wire pin ground connection.
Described switch power module is a LM2596-ADJ adjustable voltage Switching Power Supply, and the 24V of this LM2596-ADJ adjustable voltage Switching Power Supply output connects 16 pin of XTR110 electric current loop special IC.The switching frequency 150KHZ of LM2596-ADJ adjustable voltage Switching Power Supply, voltage adjusting range is from 1.2V-37V.Power amplifying part in the V/I conversion needs a Switching Power Supply, utilizes LM2596-ADJ self-control 24V stabilized voltage supply, and the 3A electric current can be provided, and makes the simple efficient height of power supply architecture (79%) with LM2596-ADJ and makes easily.
Described steady pressure of system power supply adopts the required stabilized voltage supply 5V of linear Integrated voltage stabilizer LM7805 manufacturing system, and this stabilized voltage supply 5V output connects 7 pin of single-chip microcomputer and 2 pin of LCD 1602 liquid crystal display circuits.The positive pole that also connects radiator fan.
Keyboard Designing in the keypad circuit only is 2 buttons, and button is served as electric current respectively and added, subtracts, and realizes quick stepping when length surpasses 200mA by certain button and electric current accumulative total.
Described control module also comprises driving circuit and radiator fan, and ad hoc settled electric current output starts a radiator fan to field effect transistor IRF9540 is dispelled the heat when surpassing 800MA; The PB0 pin output high level of described single-chip microcomputer adds triode and amplifies back connection radiator fan; Described stabilized voltage supply 5V output connects the positive pole of radiator fan.Radiator fan can also reduce the area of heating radiator when helping electric current stable, realize miniaturization.
With control program, the frequency of described PWM waveform is 28.8kHz in the described single chip control module; This constant current source Control current scope is at 0-1A.Native system N gets 256, and the PWM wave frequency is 28.8kHz, and the frequency height helps RC filtering.
It also comprises casing, and the display screen in button and the liquid crystal display circuit is inlaid in respectively on the casing, and described each module all is arranged on the circuit board, and described circuit board is installed in the casing.
Described control program adopts BASIC to write, and is compiled into the HEX operating file that single-chip microcomputer needs.
Described BASIC writes control program and program compiler all adopts the BASCOM-AVR translation and compiling environment to carry out.
Adopted high-performance single chip computer AT MEGA8, control instrument current ring change-over circuit has been realized digital control DC current source the utility model design innovation.Its circuit form mainly by single chip machine controlling circuit, display circuit, D/A conversion, current loop circuit, etc. partly form.This current source circuit utilizes special-purpose electric current loop integrated circuit to realize voltage-controlled current source, and exports by Single-chip Controlling PWM conversion and control voltage and to realize current digital control, can accurately realize 0～1A constant current.Because the design's electric circuit characteristic, the precision of electric current and the linearity do not rely on single chip machine controlling circuit, need not current detection control circuit, closed-loop control, PID and regulate and wait the accurate control that realizes output current, therefore alleviate the design cost of control circuit greatly.Current source stable performance, the carrying load ability of this method design are strong, can realize output current regulating by button.
Low cost high precision numerical control constant-current source of the present utility model can be widely used in the DCS of laboratory, power plant, the debugging passage in the deh control system, the field apparatus and some need be adjusted on the opertaing device by electric current.
Description of drawings
Fig. 1 is the system chart of this low cost high precision numerical control constant-current source;
Fig. 2 is the current source module figure of this low cost high precision numerical control constant-current source;
Fig. 3 is the current source design circuit figure of this low cost high precision numerical control constant-current source;
Fig. 4 is the Order RC low pass passive filter circuit diagram of this low cost high precision numerical control constant-current source;
Fig. 5 is the steady pressure of system power circuit diagram of this low cost high precision numerical control constant-current source;
Fig. 6 is the artificial circuit figure of this low cost high precision numerical control constant-current source;
Fig. 7 is the artificial circuit design sketch of Fig. 6.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Shown in Fig. 1-7 a kind of low cost high precision numerical control constant-current source of the present utility model, a kind of low cost high precision numerical control constant-current source, it comprises current source module, human-machine interface module and single chip control module;
Described current source module comprises that XTR110 electric current loop special IC and high-power FET IRF9540 adjust pipe;
Described human-machine interface module comprises the liquid crystal display circuit that keypad circuit and LCD 1602 constitute, for the I/O mouth of saving single-chip microcomputer and the difficulty that reduces the PCB circuit board wiring, described LCD 1602 liquid crystal display circuits adopt 4 line system modes, be that liquid crystal display circuit D0～D3 bidirectional data line is empty need not, only with four bidirectional data lines of D4～D7, the RS register is selected and the pin of E Enable Pin connects single-chip microcomputer, RW read-write wire pin ground connection;
Described single chip control module comprises filtering circuit, switch power module, steady pressure of system module and performance evaluation and the test module that is produced the PWM functional module of PWM waveform, is made of Order RC low pass passive filter as the control module of control center, by one in the ATMEGA8 single-chip microcomputer sheet Timer with 16 PWM functions by the MEGA8 single-chip microcomputer;
Described keypad circuit connects PD4, the PD5 pin of MEGA8 single-chip microcomputer, and liquid crystal display circuit connects MEGA8 single-chip microcomputer PC0-PC5 pin; The pwm signal of the PB1 output of MEGA8 single-chip microcomputer connects Order RC low pass passive filter, and the direct current signal of output connects 5 pin of current source module XTR110;
The MEGA8 single-chip microcomputer uses internal oscillator that basic service condition is provided;
After the filtering of RC low pass passive filter, change output voltage controlled variable control voltage-controlled current source by 10 PWM conversion outputs that MEGA8 single-chip microcomputer inside carries as D/A;
Described switch power module is a LM2596-ADJ adjustable voltage Switching Power Supply, the 24V of this LM2596-ADJ adjustable voltage Switching Power Supply output connects 16 pin of XTR110 electric current loop special IC, the switching frequency 150KHZ of LM2596-ADJ adjustable voltage Switching Power Supply, voltage adjusting range is from 1.2V-37V, power amplifying part in the V/I conversion needs a Switching Power Supply, utilize LM2596-ADJ self-control 24V stabilized voltage supply, the 3A electric current can be provided, make the simple efficient height of power supply architecture (79%) with LM2596-ADJ and make easily;
Described steady pressure of system power supply adopts the required 5V stabilized voltage supply of linear Integrated voltage stabilizer LM7805 manufacturing system, and this stabilized voltage supply 5V output connects 7 pin of single-chip microcomputer and 2 pin of LCD 1602 liquid crystal display circuits, also connects the positive pole of radiator fan;
Described performance evaluation and test module are an artificial circuit, the voltage controlled current source circuit carries out emulation by simulation software and process is carried out actual test to the model machine of producing, when the current value of given a certain setting, outputting current steadily and error control are in 1%, and test result sees Table 1:
Table 1
| Setting value mA | Milliammeter reading mA | Error % |
| 10 | 10 | 0.0％ |
| 50 | 51 | 1％ |
| 100 | 101 | 1％ |
| 200 | 199 | 1％ |
| 300 | 300 | 0％ |
| 400 | 401 | 1％ |
| 500 | 500 | 0％ |
| 600 | 600 | 0％ |
| 700 | 699 | 1％ |
| 800 | 799 | 1％ |
| 900 | 900 | 0％ |
| 1000 | 1001 | 0.1％ |
Keyboard Designing in the described keypad circuit is 2 buttons, and button is served as electric current respectively and added, subtracts, and realizes quick stepping when length surpasses 200mA by certain button and electric current accumulative total;
Described control module also comprises driving circuit and radiator fan, and ad hoc settled electric current output starts a radiator fan to field effect transistor IRF9540 is dispelled the heat when surpassing 800MA; The PB0 pin output high level of described single-chip microcomputer adds triode and amplifies back connection radiator fan; Described stabilized voltage supply 5V output connects the positive pole of radiator fan.Radiator fan can also reduce the area of heating radiator when helping electric current stable, realize miniaturization;
Electric current output in this constant current source drives output by adjusting pipe;
With control program, the frequency of described PWM waveform is 28.8kHz in the described single chip control module; This constant current source Control current scope is at 0-1A.Native system N gets 256, and the PWM wave frequency is 28.8kHz, and the frequency height helps RC filtering;
It also comprises casing, and the display screen in button and the liquid crystal display circuit is inlaid in respectively on the casing, and described each module all is arranged on the circuit board, and described circuit board is installed in the casing;
Described control program adopts BASIC to write, and is compiled into the HEX operating file that single-chip microcomputer needs;
Described BASIC writes control program and program compiler all adopts the BASCOM-AVR translation and compiling environment to carry out.
This constant current source utilizes special IC to realize a kind of voltage-controlled current source, and realizes by the Single-chip Controlling High-Accuracy PWM that D/A conversion and control voltage is exported and realize current digital control.Only need just can realize accurate control to output current by the open loop regulating and controlling.Current source stable performance, the carrying load ability of this method design are strong.
Claims (10)
1. low cost high precision numerical control constant-current source, it is characterized in that: it comprises current source module, human-machine interface module and single chip control module; Described current source module comprises XTR110 electric current loop special IC and adjusts pipe; Described human-machine interface module comprises keypad circuit and liquid crystal display circuit; Described single chip control module comprises filtering circuit, switch power module, steady pressure of system module and performance evaluation and the test module that is produced the PWM functional module of PWM waveform, is made of Order RC low pass passive filter as the control module of control center, by one in the ATMEGA8 single-chip microcomputer sheet Timer with 16 PWM functions by the MEGA8 single-chip microcomputer; Described keypad circuit connects PD4, the PD5 pin of MEGA8 single-chip microcomputer, and liquid crystal display circuit connects MEGA8 single-chip microcomputer PC0-PC5 pin; The pwm signal of the PB1 output of MEGA8 single-chip microcomputer connects Order RC low pass passive filter, and the direct current signal of output connects 5 pin of current source module XTR110; The MEGA8 single-chip microcomputer uses internal oscillator that basic service condition is provided; After the filtering of RC low pass passive filter, change output voltage controlled variable control voltage-controlled current source by 10 PWM conversion outputs that MEGA8 single-chip microcomputer inside carries as D/A; Described performance evaluation and test module are an artificial circuit, the voltage controlled current source circuit carries out emulation by simulation software and process is carried out actual test to the model machine of producing, when the current value of given a certain setting, outputting current steadily and error control are in 1%; Electric current output in this constant current source drives output by adjusting pipe.
2. a kind of low cost high precision numerical control constant-current source according to claim 1 is characterized in that: described adjustment pipe adopts high-power FET IRF9540.
3. a kind of low cost high precision numerical control constant-current source according to claim 1 is characterized in that: described liquid crystal display circuit is made of LCD 1602.
4. a kind of low cost high precision numerical control constant-current source according to claim 3, it is characterized in that: described LCD 1602 liquid crystal display circuits adopt 4 line system modes, be that liquid crystal display circuit D0～D3 bidirectional data line is empty need not, only with four bidirectional data lines of D4～D7, the RS register is selected and the pin of E Enable Pin connects single-chip microcomputer, RW read-write wire pin ground connection.
5. a kind of low cost high precision numerical control constant-current source according to claim 1, it is characterized in that: described switch power module is a LM2596-ADJ adjustable voltage Switching Power Supply, and the 24V of this LM2596-ADJ adjustable voltage Switching Power Supply output connects 16 pin of XTR110 electric current loop special IC.
6. a kind of low cost high precision numerical control constant-current source according to claim 4, it is characterized in that: described steady pressure of system power supply adopts the required stabilized voltage supply 5V of linear Integrated voltage stabilizer LM7805 manufacturing system, and this stabilized voltage supply 5V output connects 7 pin of single-chip microcomputer and 2 pin of LCD 1602 liquid crystal display circuits.The positive pole that also connects radiator fan.
7. a kind of low cost high precision numerical control constant-current source according to claim 4, it is characterized in that: the keyboard Designing in the keypad circuit only is 2 buttons, button is served as electric current respectively and is added, subtracts, and realizes quick stepping when length surpasses 200mA by certain button and electric current accumulative total.
8. a kind of low cost high precision numerical control constant-current source according to claim 6, it is characterized in that: described control module also comprises driving circuit and radiator fan, and ad hoc settled electric current output starts a radiator fan to field effect transistor IRF9540 is dispelled the heat when surpassing 800MA; The PB0 pin output high level of described single-chip microcomputer adds triode and amplifies back connection radiator fan; Described stabilized voltage supply 5V output connects the positive pole of radiator fan.
9. a kind of low cost high precision numerical control constant-current source according to claim 1 is characterized in that: with control program, the frequency of described PWM waveform is 28.8kHz in the described single chip control module; This constant current source Control current scope is at 0-1A.
10. a kind of low cost high precision numerical control constant-current source according to claim 7, it is characterized in that: it also comprises casing, display screen in button and the liquid crystal display circuit is inlaid in respectively on the casing, and described each module all is arranged on one road plate, and described circuit board is installed in the casing.
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| CNU2008202049258U CN201335996Y (en) | 2008-12-09 | 2008-12-09 | Low-cost high-accuracy numerical-control constant current source |
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| CNU2008202049258U CN201335996Y (en) | 2008-12-09 | 2008-12-09 | Low-cost high-accuracy numerical-control constant current source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789251A (en) * | 2012-05-21 | 2012-11-21 | 上海显恒光电科技股份有限公司 | Current adjustable constant current circuit |
| CN109176589A (en) * | 2018-09-18 | 2019-01-11 | 广州大学 | A kind of software manipulator based on SMA spring |
-
2008
- 2008-12-09 CN CNU2008202049258U patent/CN201335996Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789251A (en) * | 2012-05-21 | 2012-11-21 | 上海显恒光电科技股份有限公司 | Current adjustable constant current circuit |
| CN109176589A (en) * | 2018-09-18 | 2019-01-11 | 广州大学 | A kind of software manipulator based on SMA spring |
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Granted publication date: 20091028 Termination date: 20111209 |