CN107620072A - A kind of digital control type potentiostat - Google Patents
A kind of digital control type potentiostat Download PDFInfo
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- CN107620072A CN107620072A CN201710881718.XA CN201710881718A CN107620072A CN 107620072 A CN107620072 A CN 107620072A CN 201710881718 A CN201710881718 A CN 201710881718A CN 107620072 A CN107620072 A CN 107620072A
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Abstract
The invention discloses a kind of digital control type potentiostat, including high frequency switch power, control and transmission unit, operation and display unit；The high frequency switch power connects control and transmission unit, operation and display unit respectively.The present invention is using high frequency switch power as power conversion unit, and for digital integrated electronic circuit as control unit, touch-screen is simple, practical, attractive in appearance as alternating interface between man and computer, easily operated.
Description
Technical field
The present invention relates to potentiometer, and in particular to a kind of digital control type potentiostat.
Background technology
At present, digital control type potentiostat is to be based on traditional potentiostat（Rectifier）A kind of AC-DC conversion developed
Power-supply device, it is mainly used in the cathodic protection field of oil and gas pipeline, storage tank.It has adjust, automatically adjust manually,
The functions such as constant flow regulation, on-off function, fault warning, power interruption recovering, remote control, data remote transmission.
Conventional potentiostat is formed using transformer, controllable silicon and regulator, will by transformer and controllable silicon
Civil power is changed into direct current, and output size is adjusted by regulator.In cathodic protection field, conventional potentiostat serves
Considerable effect.It is protected in cathodic protection according to galvanic principles by protective as cathode terminal, permanent electricity
Position instrument is existed as supplies voltages difference.
Conventional potentiostat is broadly divided into rectifying part, display portion, control section.Rectifying part is mainly by controllable silicon
And transformer composition；Display portion is mainly each several part data of display device, is divided into current/voltage, output current/electricity
Pressure, by protection potential of protective etc.；Control section is mainly by parts such as regulator, current limiting pressure-limiting device, fault alarms
Composition.
For conventional potentiostat because being to use SCR control, the ripple factor exported after its rectification is bigger than normal, is unfavorable for
The control of potentiostat and Data Detection.Especially in the detection by protective, because ripple factor is bigger than normal, in direct current output
Alternating component is higher, causes relatively low by protective DATA REASONING difficulty, the degree of accuracy.The cost of DATA REASONING can virtually be increased.
The control section of conventional potentiostat is controlled with analog circuit, and its control accuracy is low, complicated, function is real
Existing difficulty, cause guidance panel complicated, be not easy to realize that network remote operates.
Conventional potentiostat since it is desired that controlled using transformer and silicon controlled rectifier, analog circuit, so its volume it is big,
Weight weight, power factor are low.
The content of the invention
The present invention is in view of the above-mentioned problems, provide a kind of digital control type potentiostat, including high frequency switch power, control and transmission
Unit, operation and display unit；The high frequency switch power connects control and transmission unit, operation and display unit respectively；
High frequency switch power completes AC-DC conversion using IGBT as core devices using digital control technology, and civil power is converted into can
Direct current is exporting；
Control and transmission unit use digital integrated electronic circuit, using single-chip microcomputer as core to control the output of high frequency switch power,
And output is automatically adjusted according to the environment using scene；It is connected in actual use by RS485 with remote terminal, and to long-range
Terminal sends output data, alarm status and running state data etc. of equipment, and remote terminal also can be by RS485 to equipment
Send output and running status of the control information to adjustment equipment；
Operation and display unit use touch-screen that data occur with control unit on the spot and communicate, issue as alternating interface between man and computer
Running status order, and the output state and data of display device are adjusted, working condition, alarm and the reset of display device are set
It is standby.
Further, the control and transmission unit include power supply stabilization circuit, RTC real-time Communication for Power circuits, signal transacting
Circuit, RS485 turn 232 datel circuits, outer triggering signal circuit, central processing unit minimum system circuit, outside select machine,
Indicator lamp, triggering drive circuit and auxiliary circuit, voltage, electric current, potential data Acquisition Circuit, flash storage circuits are outside
AC voltage sampling process circuit；Voltage, electric current, the potential data Acquisition Circuit first order use differential amplification, and the second level uses
LPF amplifies.
Further, the digital control type potentiostat specifically includes：
Power network inputs：Single-phase or three-phase input is used according to capacity or system requirements；
Industrial frequency rectifying：Industrial frequency AC is changed into power frequency pulsating direct current；
Input filter：Pulsating direct current is smooth and purifies；
Driver element：PWM control outputs, directly control IGBT；
Inversion module：DC converting is high-frequency ac, and open-closes time control by control and export；
High-frequency isolation transformation：Input is completed with high frequency transformer with what is exported to isolate, and ensures Electrical Safety, while needed
Voltage class；
High-frequency rectification：High-frequency ac is transformed to high-frequency direct-current；
Output filtering and sampling：The purification of dither direct current is the direct current of high quality, while completes adopting for output voltage and electric current
Sample, feed back to centralized control unit；
Reference inputs：Reference signal is through this unit access device；
Reference signal isolation amplification：It is reference signal total system, by the process isolated, amplified, the system of reference connects
Line mode and signal strength are unrestricted；
The machine is controlled and running status is shown：Complete control mode, the setting of current potential, electric current, the control of open and close machine, running status
It has been shown that, including power supply show, run display, malfunction coefficient；
Centralized control unit：After each side's data and instruction are incoming, ensure operation and output；
Under the automatic running state of equipment, reference potential signal is amplified into center control list by reference signal isolation
Member；Centralized control unit is sent needed for calculating according to the signal of sampling feedback, com-parison and analysis input reference potential and presetting potential
Pwm signal dutycycle, IGBT is driven by pwm signal, high-frequency isolation transformation pass through in adjustment IGBT outputs, IGBT outputs, height
Frequency rectification, finally export required voltage after output filters.
Advantages of the present invention：
The high frequency switch power of the digital control type potentiostat of the present invention has that control accuracy is high, ripple factor is small, in light weight, volume
Small, the features such as power factor is high；
Control section is controlled using digital integrated electronic circuit, and touch-screen is characterized in that control is accurate, structure is simple as operation interface
Single, function realizes that simple, alternating interface between man and computer is simple to operate, is easy to network remote operation and data transfer；
The present invention is made using high frequency switch power as power conversion unit, digital integrated electronic circuit as control unit, touch-screen
It is simple, practical, attractive in appearance for alternating interface between man and computer, it is easily operated.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to figure, the present invention is further detailed explanation.
Brief description of the drawings
The accompanying drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.
Fig. 1 is a kind of schematic diagram of digital control type potentiostat of the present invention.
Fig. 2 is a kind of control of digital control type potentiostat and the power supply stabilization circuit of transmission unit of the present invention；
Fig. 3 is a kind of control of digital control type potentiostat and the RTC real-time Communication for Power circuit of transmission unit of the present invention；
Fig. 4 is a kind of control of digital control type potentiostat and the external power source change-over circuit of transmission unit of the present invention；
Fig. 5 is that a kind of digital control type potentiostat control of the present invention and the RS485 of transmission unit turn 232 datel circuits；
Fig. 6 is a kind of control of digital control type potentiostat and the outer triggering signal circuit of transmission unit of the present invention；
Fig. 7 is a kind of control of digital control type potentiostat and the central processing unit minimum system circuit of transmission unit of the present invention；
Fig. 8 is a kind of control of digital control type potentiostat and the flash storage circuit of transmission unit of the present invention；
Fig. 9 is a kind of control of digital control type potentiostat and the external communication voltage acquisition process circuit of transmission unit of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
With reference to figure 1, a kind of digital control type potentiostat as shown in Figure 1, including high frequency switch power, control and transmission are single
Member, operation and display unit；The high frequency switch power connects control and transmission unit, operation and display unit respectively；
High frequency switch power completes AC-DC conversion using IGBT as core devices using digital control technology, and civil power is converted into can
Direct current is exporting；
Control and transmission unit use digital integrated electronic circuit, using single-chip microcomputer as core to control the output of high frequency switch power,
And output is automatically adjusted according to the environment using scene；It is connected in actual use by RS485 with remote terminal, and to long-range
Terminal sends output data, alarm status and running state data etc. of equipment, and remote terminal also can be by RS485 to equipment
Send output and running status of the control information to adjustment equipment；
Operation and display unit use touch-screen that data occur with control unit on the spot and communicate, issue as alternating interface between man and computer
Running status order, and the output state and data of display device are adjusted, working condition, alarm and the reset of display device are set
It is standby.
Referring to figs. 2 to Fig. 9, as shown in Fig. 2 to Fig. 9, the control and transmission unit include power supply stabilization circuit, and RTC is real
When telecommunication circuit, signal processing circuit, RS485 turn 232 datel circuits, outer triggering signal circuit, central processing unit is most
Machine, indicator lamp, triggering drive circuit and auxiliary circuit, voltage, electric current, potential data collection electricity are selected in mini system circuit, outside
Road, flash storage circuits, external communication voltage acquisition process circuit；Voltage, electric current, the potential data Acquisition Circuit first order make
With differential amplification, the second level is amplified using LPF；Signal processing circuit uses 7805/7905 power supply chip.External trigger
Signal circuit is using 12 D/A of high accuracy（AD5320）Ensure the stabilization and precision of control signal.The power supply stabilization circuit will
12V changes to 5V, then changes to 3.3V；RTC real-time Communication for Power circuit uses chip X1203.
Fig. 2 is a kind of control of digital control type potentiostat and the power supply stabilization circuit of transmission unit of the present invention,
To Power convert, 12V is become into 5V and becomes 3.3V, 5V powers to DA, and 3.3V powers to single-chip microcomputer.
Fig. 3 is a kind of control of digital control type potentiostat and the RTC real-time Communication for Power of transmission unit of the present invention
Circuit, to realize calendar function.
Fig. 4 is a kind of digital control type potentiostat control of the present invention and the external power source conversion of transmission unit
Circuit, to signal acquisition and reserved outside Acquisition Circuit, U9, U10 in wherein Fig. 3 are OP07.
Fig. 5 is that a kind of digital control type potentiostat control of the present invention and the RS485 of transmission unit turn 232
Datel circuit, to outside 485 data transfers, local touch-screen control, realize man-machine interaction.
Fig. 6 is a kind of control of digital control type potentiostat and the outer triggering signal of transmission unit of the present invention
Circuit, to control high frequency switch power（IGBT）.
Fig. 7 be the present invention a kind of digital control type potentiostat control and transmission unit central processing unit most
Mini system circuit, to as single-chip minimum system.
Fig. 8 is a kind of control of digital control type potentiostat and the flash storage electricity of transmission unit of the present invention
Road, to save historical data, working condition, the setting of system etc..
Fig. 9 is a kind of control of digital control type potentiostat and the external communication voltage of transmission unit of the present invention
Acquisition process circuit, to carry out alternating current input power supplying collection.
The digital control type potentiostat specifically includes：
Power network inputs：Single-phase or three-phase input is used according to capacity or system requirements；
Industrial frequency rectifying：Industrial frequency AC is changed into power frequency pulsating direct current；
Input filter：Pulsating direct current is smooth and purifies；
Driver element：PWM control outputs, directly control IGBT；
Inversion module：DC converting is high-frequency ac, and open-closes time control by control and export；
High-frequency isolation transformation：Input is completed with high frequency transformer with what is exported to isolate, and ensures Electrical Safety, while needed
Voltage class；
High-frequency rectification：High-frequency ac is transformed to high-frequency direct-current；
Output filtering and sampling：The purification of dither direct current is the direct current of high quality, while completes adopting for output voltage and electric current
Sample, feed back to centralized control unit；
Reference inputs：Reference signal is through this unit access device；
Reference signal isolation amplification：It is reference signal total system, by the process isolated, amplified, the system of reference connects
Line mode and signal strength are unrestricted；
The machine is controlled and running status is shown：Complete control mode, the setting of current potential, electric current, the control of open and close machine, running status
It has been shown that, including power supply show, run display, malfunction coefficient；
Centralized control unit：After each side's data and instruction are incoming, ensure operation and output；
Under the automatic running state of equipment, reference potential signal is amplified into center control list by reference signal isolation
Member；Centralized control unit is sent needed for calculating according to the signal of sampling feedback, com-parison and analysis input reference potential and presetting potential
Pwm signal dutycycle, IGBT is driven by pwm signal, high-frequency isolation transformation pass through in adjustment IGBT outputs, IGBT outputs, height
Frequency rectification, finally export required voltage after output filters.
The main composition of the present invention is divided into：High frequency switch power；Control and transmission unit；Operation and display unit.
High frequency switch power completes AC-DC conversion using IGBT as core devices using advanced digital control technology, by city
Electricity is converted into available direct current to export.
Control and transmission unit use digital integrated electronic circuit, using single-chip microcomputer as core controlling the defeated of high frequency switch power
Go out, and output is automatically adjusted according to the environment using scene.It is connected in actual use by RS485 with remote terminal, and to
Remote terminal sends output data, alarm status and running state data etc. of equipment, and remote terminal also can by RS485 to
Equipment sends output and running status of the control information to adjustment equipment.
Operation and display unit using touch-screen be used as alternating interface between man and computer, on the spot with control unit generation data communicate,
Issue regulation running status order, and the output state and data of display device, working condition, alarm and the reset of display device
Equipment.
The digital control type potentiostat of the present invention has good stability, reliability and security, latest type impressed current negative electrode
Protection power source device.It completes power conversion using IGBT as core devices, using advanced digital control technology.With conventional cathode
Protection power source（Magnetic saturation or controllable silicon potentiostat）Compare, numerical control potentiostat has small volume, in light weight, power factor
Height, ripple factor is low, control is accurate, is easy to networking, friendly alternating interface between man and computer, can make one intuitively operation and maintenance, note
A series of unrivaled advantages such as data are recorded, are the upgraded products of traditional potentiostat such as controllable silicon or magnetic saturation.
Serial numerical control potentiostat be used for soil, seawater, fresh water, the steel pipe in chemical medium, cable, steel harbour,
The impressed current cathodic protection system of the metal structures such as naval vessel, storage tank bottom, cooler.
Requirement to power network：
Single-phase AC220V ± 20%；
The three-phase and four-lines of three-phase AC380V ± 20%.
Ac power frequency fluctuation range：
Rated frequency：50Hz(60Hz)；
Frequency fluctuation scope：47.5Hz~63Hz；
Other power-supplying forms require in accordance with owner.
The key technical indexes：
Basic performance：
1）Output voltage：DC 0-40V (continuously adjustabe)；
2）Output current：DC 0-15A (continuously adjustabe)；
3）Potentiostat controls reference potential adjustable range：-3000mV~ 0mV
Control of Electric potentials precision≤± 5mV；
4）The Μ Ω of reference input impedance >=2；
Flow through the μ A of reference electrode electric current≤1；
5）Output ripple coefficient：≤ 1%；
6）Constant current controlling precision：≤1%；
7）Reference potential error is alarmed：±50mV ；
8）Anti- 50Hz interference： ≥30V（Between reference and ground）；
Anti- DC influence：≥24V；
9）Two-shipper is supported to automatically switch；
10）When constant potential breaks down, constant current working condition is automatically switched to；
11）Fully loaded operating efficiency（Complete machine operating efficiency）>=100%；
12）Power failure test function：Make-and-break time can be adjusted by user, and default setting is logical 12 seconds, is broken 3 seconds.
Security performance：
1）Insulaion resistance>50 MΩ；
2）Dielectric strength 2000V（Input is to output）；
3）Noise≤45db；
Protective value：
1）Temperature protection：Potentiostat temperature in chassis reaches 65 DEG C, blower fan full speed running；When temperature reaches 85 DEG C, constant potential
Instrument autostop cools.When protective condition returns to normal, equipment is transferred to normal operating condition automatically
2）Electric network protection：It is out of service when line voltage exceeds specified 30%.To DC power-supply system, beyond 10%, stop
Operation.When protective condition returns to normal, equipment is transferred to normal operating condition automatically
3）Limit protection：Output voltage limits rated output voltage × 110%
Output current limits output-current rating × 110%
Reference potential restriction -3000mV ~ 0mV
4）Anti-lightning strike protection：There is anti-lightning strike safeguard measure at the input of potentiostat, output, reference end.
5）The anti-interference protection of reference：The anti-interference protection of reference is provided with reference end, can guarantee that reference end steady operation.
6）Wiring board three proofings（Protection against the tide, salt spray proof, gas defence）.
The high frequency switch power of the digital control type potentiostat of the present invention has that control accuracy is high, ripple factor is small, in light weight, volume
Small, the features such as power factor is high；
Control section is controlled using digital integrated electronic circuit, and touch-screen is characterized in that control is accurate, structure is simple as operation interface
Single, function realizes that simple, alternating interface between man and computer is simple to operate, is easy to network remote operation and data transfer；
The present invention is made using high frequency switch power as power conversion unit, digital integrated electronic circuit as control unit, touch-screen
It is simple, practical, attractive in appearance for alternating interface between man and computer, it is easily operated.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (3)
1. a kind of digital control type potentiostat, it is characterised in that including high frequency switch power, control and biography
Defeated unit, operation and display unit；The high frequency switch power connects control respectively and transmission unit, operation and display are single
Member；
High frequency switch power completes AC-DC conversion using IGBT as core devices using digital control technology, and civil power is converted into can
Direct current is exporting；
Control and transmission unit use digital integrated electronic circuit, using single-chip microcomputer as core to control the output of high frequency switch power,
And output is automatically adjusted according to the environment using scene；It is connected in actual use by RS485 with remote terminal, and to long-range
Terminal sends output data, alarm status and running state data etc. of equipment, and remote terminal also can be by RS485 to equipment
Send output and running status of the control information to adjustment equipment；
Operation and display unit use touch-screen that data occur with control unit on the spot and communicate, issue as alternating interface between man and computer
Running status order, and the output state and data of display device are adjusted, working condition, alarm and the reset of display device are set
It is standby.
2. digital control type potentiostat according to claim 1, it is characterised in that it is described control and
Transmission unit includes power supply stabilization circuit, RTC real-time Communication for Power circuits, signal processing circuit, RS485 turns of 232 data communications
Circuit, outer triggering signal circuit, central processing unit minimum system circuit, outside select machine, indicator lamp, triggering drive circuit and
Auxiliary circuit, voltage, electric current, potential data Acquisition Circuit, flash storage circuits, external communication voltage acquisition process circuit；Electricity
Pressure, electric current, the potential data Acquisition Circuit first order use differential amplification, and the second level is amplified using LPF.
3. digital control type potentiostat according to claim 1, it is characterised in that the digital control type
Potentiostat specifically includes：
Power network inputs：Single-phase or three-phase input is used according to capacity or system requirements；
Industrial frequency rectifying：Industrial frequency AC is changed into power frequency pulsating direct current；
Input filter：Pulsating direct current is smooth and purifies；
Driver element：PWM control outputs, directly control IGBT；
Inversion module：DC converting is high-frequency ac, and open-closes time control by control and export；
High-frequency isolation transformation：Input is completed with high frequency transformer with what is exported to isolate, and ensures Electrical Safety, while needed
Voltage class；
High-frequency rectification：High-frequency ac is transformed to high-frequency direct-current；
Output filtering and sampling：The purification of dither direct current is the direct current of high quality, while completes adopting for output voltage and electric current
Sample, feed back to centralized control unit；
Reference inputs：Reference signal is through this unit access device；
Reference signal isolation amplification：It is reference signal total system, by the process isolated, amplified, the system of reference connects
Line mode and signal strength are unrestricted；
The machine is controlled and running status is shown：Complete control mode, the setting of current potential, electric current, the control of open and close machine, running status
It has been shown that, including power supply show, run display, malfunction coefficient；
Centralized control unit：After each side's data and instruction are incoming, ensure operation and output；
Under the automatic running state of equipment, reference potential signal is amplified into center control list by reference signal isolation
Member；Centralized control unit is sent needed for calculating according to the signal of sampling feedback, com-parison and analysis input reference potential and presetting potential
Pwm signal dutycycle, IGBT is driven by pwm signal, high-frequency isolation transformation pass through in adjustment IGBT outputs, IGBT outputs, height
Frequency rectification, finally export required voltage after output filters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710881718.XA CN107620072A (en) | 2017-09-26 | 2017-09-26 | A kind of digital control type potentiostat |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710881718.XA CN107620072A (en) | 2017-09-26 | 2017-09-26 | A kind of digital control type potentiostat |
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| CN107620072A true CN107620072A (en) | 2018-01-23 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393764A (en) * | 2014-12-08 | 2015-03-04 | 西安石油大学 | Special constant-potential pulse power supply for protecting oil well casing cathode and construction method thereof |
-
2017
- 2017-09-26 CN CN201710881718.XA patent/CN107620072A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393764A (en) * | 2014-12-08 | 2015-03-04 | 西安石油大学 | Special constant-potential pulse power supply for protecting oil well casing cathode and construction method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 林伟等: "新型智能式恒电位仪", 《测控技术》 * |
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