CN105628771B - A kind of direct current electrochemical applications system based on solar cell for supplying power - Google Patents

Abstract

A direct current electrochemical application system powered by solar cells, the system includes a solar cell unit, a control unit, a signal source unit, a measurement unit and a calibration unit; the solar cell unit converts solar energy into electrical energy to provide an energy source for the entire system; the control unit It provides intelligent switching between the output mode of the signal source unit and the measurement mode of the measurement unit, and realizes the electrolysis process and electrochemical related measurement functions; the signal source unit provides the constant potential and constant current required by the electrolysis process; the measurement unit can realize the correlation of the sample to be tested Electrical characteristic parameters; the correction unit provides the error analysis of the output signal of the signal source unit and the measurement signal of the measurement unit, and realizes the accuracy of the output signal and the measurement signal by comparing the signal of the built-in reference source with the feedback signal of the signal source unit and the measurement unit. Direct use of solar energy to complete the traditional electrochemical measurement and electrolysis process, energy saving and environmental protection, no pollution and low cost, portable and mobile.

Description

A direct current electrochemical application system powered by solar cells

technical field

The invention belongs to the application field of solar power generation, and specifically relates to a power supply source for direct current electrochemical applications, in particular to a direct current electrochemical application system powered by solar cells, which can directly convert solar energy into electrical energy by solar cells to complete required electrical performance parameters Measurement.

Background technique

With the rapid development of world economic globalization and the demand for urban modernization, the consumption of traditional fossil fuels is gradually increasing, resulting in the decreasing reserves of available fossil fuels and environmental pollution problems such as the greenhouse effect. Solar energy is green and clean and has abundant reserves (about 170K TW), so it can be used as a representative of renewable energy and has become the object of development in many countries in recent years. At present, the most important way to utilize solar energy - solar cells. Solar cells can directly convert light energy into electrical energy. With the technological breakthroughs of researchers, the efficiency of solar cells is expected to break through 25% and above. Among them, monocrystalline silicon modules with higher conversion efficiency are installed and used by many users because of their low manufacturing cost, low price and high safety factor.

The measurement of electrochemical parameters used in traditional manufacturing and experimental research is completed on the basis of electrochemical workstations, and the power supply of these devices comes from the mains. It is mainly supplied by the mains electricity for the normal operation of the electrochemical workstation, and the high electricity bills generated by long-term use will increase the cost of manufacturing and scientific research. The direct current electrochemical application system involved in the present invention utilizes solar cells to convert solar energy into electrical energy to supply electrical energy for the normal operation of the electrochemical application system, so it is expected to replace the traditional electrochemical workstation and effectively reduce the production of electrochemical measurement and electrolysis process cost.

In addition, traditional electrochemical workstations require mains power to provide energy sources, so traditional electrochemical workstations cannot be used in mountainous areas, desert areas, coastal beaches and other areas with low grid coverage. However, these places are rich in solar energy, so the solar cell-based DC electrochemical application system of the present invention can be used to realize processes or experiments related to electrochemical measurement and electrolysis.

Contents of the invention

Aiming at some of the limitations of the existing electrochemical workstations mentioned above, the present invention provides a novel electrochemical application system that is energy-saving, environmentally friendly, low-cost and portable and mobile. It mainly uses solar cells to convert solar energy into electrical energy, and then through intelligent control and mode Automatic identification realizes traditional electrochemical measurement and electrolysis process.

In order to solve the above-mentioned problems of production cost and portable movement, the technical solution adopted by the present invention is: a direct current electrochemical application system powered by solar cells, the system includes a solar cell unit, a control unit, a signal source unit, a measurement unit and a calibration unit; The positive and negative poles of the output terminal of the solar cell unit are connected with the positive and negative poles of the input terminal of the control unit (2); the positive and negative poles of the output terminal of the control unit (2) are connected with the positive and negative poles of the signal source unit (3); the signal source unit (3) There are three electrodes at the output terminal: working electrode, auxiliary electrode and reference electrode, these three electrodes can be directly connected with the corresponding electrode of electrolyte; connection, or the input terminal electrodes of the measurement unit (4) are respectively shared with the three electrodes of the output terminal of the signal source unit (3); the output terminal of the measurement unit (4) is connected to the input terminal (measurement module terminal) of the control unit (2) Connection; the input end of the correction unit (5) is connected with the output end of the signal source (3) and the output end of the measurement unit (4) respectively, and the output end of the correction unit (5) is connected with the input end of the control unit (2); the signal The source (3) and the measurement unit (4) are connected in parallel with respect to the correction unit (5).

The solar cell unit converts solar energy into electrical energy and provides the energy source of the entire system; the control unit provides intelligent switching between the output mode of the signal source unit and the measurement mode of the measurement unit to realize the switching of electrolysis process and electrochemical related measurement functions; the signal source unit provides electrolysis The constant potential and constant current required by the process; the measurement unit realizes the measurement of the relevant electrical characteristic parameters of the sample to be tested; the calibration unit provides different built-in reference source signals for error calibration with the output signal of the signal source unit and the measurement signal of the measurement unit , to realize the accurate output of electrolytic process-related output signals and related electrical characteristic parameter measurement signals. The system can directly use solar energy to complete traditional electrochemical measurement and electrolysis processes.

The solar cell unit of the present invention can be photovoltaic components such as monocrystalline silicon components, polycrystalline silicon components, amorphous silicon components, thin-film silicon components, copper indium gallium selenide components, gallium arsenide components, cadmium telluride components, organic photovoltaic components, etc. Any of commercially available products in the field may be used.

As a preference, the control unit of the present invention is similar to the solar controllers sold in the market, preferably 12V. The intelligent control of electrical parameters is mainly achieved through the integration of electrical modules such as voltage regulators, Boost-Buck buck-boost circuits, and precision adjustable resistors and intelligent control methods, and the electrochemical measurement mode and electrolysis mode can be automatic or manual. switch. The intelligent control method here can be written and burned through the corresponding software of the PC, and has replaceability.

The communication mode between the control unit of the present invention and the measuring unit, the output unit and the calibration unit includes serial communication and parallel communication, preferably parallel communication.

The signal source unit of the present invention mainly provides the three electrodes required by the actual electrolysis process, and the connection methods include electrode clamp contact type, screw fixed type, and probe plug-in type, etc., and the electrode clamp contact type is preferred.

Each unit module of the present invention needs to have good insulation and anti-corrosion shell protection, and each internal module needs to have good electrical connection and electrical isolation, and the signal anti-interference ability reaches A level, which meets GB17626.

Using this system, with solar energy as the only energy source, it can directly use solar energy to complete traditional electrochemical measurement and electrolysis process. It has the advantages of energy saving and environmental protection, no pollution, easy control, and portable movement. It can also greatly reduce the consumption of commercial power. Meet the needs of electrochemical measurements and electrolytic processes in areas without electricity. In addition, the system can not only realize the continuous adjustment of the voltage and current required by the electrolysis process, but also meet the high-precision requirements of the actual electrochemical measurement, and only need to purchase a one-time cost of equipment, which is economical and applicable.

Description of drawings

Fig. 1 is the schematic diagram of the structure of the electrochemical application system of the present invention;

1 solar battery unit, 2 control unit, 3 signal source unit, 4 measurement unit, 5 correction unit;

Fig. 2 is the schematic diagram of the circuit module of the electrochemical application system of the present invention;

Figure 3 is a schematic diagram of the signal source unit—constant potential/constant current output module;

Figure 4 is a schematic diagram of the electrochemical measurement module.

Fig. 5 is a schematic diagram of the signal conditioning 1-frequency modulation module in Fig. 4 .

Fig. 6 is a schematic diagram of the signal conditioning 2-voltage regulation module in Fig. 4 .

Detailed ways

The present invention will be described in further detail below in conjunction with specific embodiments, but the present invention is not limited to the following examples. On the premise of not departing from the technical realization of the present invention, various modifications and improvements made to the technical solution of the present invention by relevant engineers and technicians in the field shall be included in the scope of protection determined by the claims of the present invention.

Example 1

A direct current electrochemical application system based on solar battery power supply, the system includes a solar battery unit 1, a control unit 2, a signal source unit 3, a measurement unit 4 and a calibration unit 5, and its system connection diagram is shown in Figure 1. Among them, the solar battery unit 1 adopts a 50W monocrystalline silicon solar panel sold in the market, and its parameters are open circuit voltage 21.5V, short circuit current 3.23A, maximum power point voltage 17.5V and maximum power point current 2.86A, conversion efficiency 17.8%; Unit 2 adopts a solar controller (programmable) sold on the market, and can control the selection and switching of the signal source module 3 and the measurement module 4 through the RS232 serial port of the computer and the programming software, and can also adjust the current and voltage of the output terminal of the signal source module in real time Size, adjust the volt-ampere characteristic curve of the output terminal, see Figure 2 for details; the signal source module 3 can provide the required constant potential or constant current according to the actual work requirements, as shown in Figure 3; the measurement module 4 is calibrated The built-in reference signal source of the unit 5 is compared with the feedback signal of the measurement terminal, and the measurement data is sampled through the sampling circuit, and then the error correction of the correction module 5 is performed, and then displayed on the computer screen interface. The system can not only realize the measurement of electrical parameters related to electrochemical measurement, but also realize the traditional electrolysis process, so that one machine can be used for multiple purposes, and it can complete the relevant functions of traditional electrochemical workstations without consuming commercial power.

The DC electrochemical measurement system includes a main control circuit module, a waveform generation module, a digital/analog conversion module, a constant potential module, a constant current module, an analog/digital conversion module, a filter module, a measurement module and a signal correction module, as shown in the accompanying drawings 2.

The signal source module includes a sine wave generation module, a multiplication circuit module, an amplification circuit module, a DC/DC conversion module, a range switching module, a display circuit module, a microprocessor module and a sampling circuit module, as shown in Figure 3 .

The measurement module includes a digital/analog signal source module, a frequency modulation module, a voltage regulation module, a sampling circuit module, a clock circuit module, a buffer circuit module and a data acquisition module, as shown in Figure 4.

The frequency modulation module includes a phase accumulation module, a waveform storage module, a digital/analog conversion module, a fixed frequency module and a filter module, as shown in Figure 5 .

The voltage regulating module is composed of a rectifying module, a filtering module, a DC/DC changing module and a voltage stabilizing module, as shown in Fig. 6 .

The measurement data of the measurement system include potential-time curve, current-time curve, polarization curve and impedance curve, etc.

The electric energy of all modules of the whole system comes from the solar energy converted by solar cells, and all internal conversion modules are DC/DC conversion.

Accompanying drawing 1 has provided the structural principle diagram of a kind of direct current electrochemical application system based on solar battery power supply described in this invention. The positive and negative poles of the output terminal of the solar cell unit (photovoltaic unit 1) are respectively connected to the positive and negative poles of the input terminal (photovoltaic module terminal) of the control unit 2; the positive and negative poles of the output terminal of the control unit 2 are connected to the positive and negative poles of the signal source unit 3 The output end of signal source unit 3 has three electrodes: working electrode, auxiliary electrode and reference electrode, these three electrodes can be directly connected with the corresponding electrode of electrolyte; The negative pole is connected or connected with the three electrodes of the signal source unit 3, the output terminal of the measurement unit 4 is connected with the input terminal (measurement module terminal) of the control unit 2; the input terminal of the correction unit 5 is respectively output with the signal source 3 terminal is connected in parallel with the output terminal of the measurement unit 4, and its output terminal is connected with the input terminal (error module terminal) of the control unit 5.

Accompanying drawing 2 has provided the schematic diagram of the circuit module of a kind of direct current electrochemical application system based on solar battery power supply described in this invention. Among them, the control unit 2 selects the working mode of the signal source unit 3-constant potential mode/constant current mode by sending a control command to the waveform generation module built in the signal source unit 3, so as to realize the output of the electrical signal on the output electrode; the measurement of the measurement unit 4 The module corrects the measured signal through the filter and the correction circuit in the correction unit 5, and then converts the corrected analog measurement signal into a digital signal through the analog/digital conversion module, and transmits it to the control unit 2 through serial communication, and further converts the measured signal to the control unit 2. Data are displayed on the computer interface.

Accompanying drawing 3 shows the schematic diagram of the signal source of a direct current electrochemical application system based on the solar cell power supply of the invention—the constant potential/constant current output module. When performing the electrolysis process, the control unit 2 of the DC electrochemical application system issues a control command, the signal generated by the sine wave signal generator and the analog output waveform signal are superimposed by the multiplication circuit, and the superimposed signal is then amplified by the amplifying circuit. The signal is further converted into the electrical signal range required by electrolysis through the DC/DC conversion module. The signal superimposed by the multiplication circuit can output the corresponding electrical signal after being calibrated once with the built-in reference circuit of the microprocessor; further, the electrical signal at the output end of the signal source unit 3 is sampled by the sampling circuit, and the sampling signal is passed through the internal circuit of the microprocessor. The comparison circuit realizes the secondary calibration of the output signal of the signal source unit 3 and then feeds it back to the control unit (2), and then outputs a high-precision electrical signal (both the built-in reference circuit and the comparison circuit belong to the microprocessor); the output signal of the signal source unit 3 The electrical signal within the corresponding range can be selected to be output by range switching.

Accompanying drawing 4 has given the principle diagram of the measuring module of a direct current electrochemical application system based on solar cell power supply described in the invention. The (electrochemical) measurement module of the measurement unit 4 of the DC electrochemical application system feeds back the measured electrical signal to the sampling circuit in the measurement unit 4, and then passes through the signal conditioning 1 frequency modulation circuit and the signal conditioning 2 voltage regulation of the correction unit 5 The circuit realizes the regulation of frequency and voltage at the same time, and then serially transmits it to the control unit 2 through analog/digital conversion, and then displays it on the computer interface. The sampling circuit of the measuring unit 4 determines the sampling period and sampling frequency through the clock circuit and the buffer circuit in the measuring unit 4 .

Accompanying drawing 5 shows the principle diagram of the signal conditioning 1 frequency modulation circuit of a direct current electrochemical application system powered by solar cells according to the invention. The signal conditioning 1 module of the calibration unit 5 in the DC electrochemical application system can realize the frequency adjustment of the measurement signal of the electrochemical measurement module. The digital output signal frequency of the electrochemical measurement module and the built-in reference frequency of the correction unit 5 are accumulated in the phase accumulator, and the accumulated digital signal can be stored in the waveform memory; the stored digital signal is converted into an analog signal through a digital/analog conversion module The signal is compared with the reference frequency source signal, and then the ripple is filtered by a low-pass filter, and an analog signal with a stable frequency can be displayed on the computer interface to achieve stable measurement of the measurement signal.

Accompanying drawing 6 shows the schematic diagram of the signal conditioning 2 voltage regulating circuit of a direct current electrochemical application system powered by solar cells according to the invention. The signal conditioning 2 voltage regulating module of the calibration unit 5 in the DC electrochemical application system can realize the voltage regulation of the measurement signal of the electrochemical measurement module. The voltage amplitude of the measurement signal of the electrochemical measurement module passes through the DC/DC conversion module to realize the voltage amplitude adjustment of the measurement signal, and then filters the ripple through the filter circuit, and the filtered signal is further realized by the voltage stabilization circuit inside the correction unit 5 After the calibration of the measurement signal, the voltage signal with a stable amplitude can be displayed on the computer interface to realize the stable measurement of the measurement signal.

Claims (8)

1. a kind of direct current electrochemical applications system based on solar cell for supplying power, which is characterized in that the system includes solar energy Battery unit, control unit, signal source unit, measuring unit and correction unit；The output positive and negative charge of solar battery cell The input terminal positive and negative anodes with control unit (2) are connected respectively；The output positive and negative charge of control unit (2) and signal source unit (3) positive and negative anodes are connected；There are three electrodes for the output terminal of signal source unit (3)：Working electrode, auxiliary electrode and reference electricity Pole, these three electrodes can directly be connected with the counter electrode of electrolyte；The input terminal of measuring unit (4) is respectively with treating test sample The positive and negative anodes of product are connected or the input terminal electrode of measuring unit (4) three electrodes with signal source unit (3) output terminal respectively It is public；The output terminal of measuring unit (4) is connected with the input terminal of control unit (2)；Correct unit (5) input terminal respectively with Signal source (3) output terminal is connected connection with measuring unit (4) output terminal, correction unit (5) output terminal and the input of control unit (2) End is connected；It is parallel relationship for signal source (3) and measuring unit (4) relative correction unit (5)；

Solar battery cell converts solar energy into electric energy, provides the energy source of whole system；Control unit provides signal The output mode of source unit and the intelligence switching of measuring unit measurement pattern, realize electrolysis process and electrochemistry measurement of correlation function Switching；Signal source unit provides the required constant potential of electrolysis process and constant current；Measuring unit realizes the correlation of sample to be tested The measurement of electrology characteristic parameter；It corrects unit and the different built-in reference source signals output signal with signal source unit respectively is provided It calibrates for error with the measuring signal of measuring unit, realizes that electrolysis process related output signal is surveyed with associated electrical characterisitic parameter Measure the accurate output of signal.

2. according to a kind of direct current electrochemical applications system based on solar cell for supplying power of claim 1, which is characterized in that too Positive energy battery unit is that photovoltaic module is monocrystalline silicon component, polysilicon members, amorphous silicon module, thin film silicon component, copper indium gallium selenide One kind in component, GaAs component, telluride cadmium component, organic photovoltaic component.

3. according to a kind of direct current electrochemical applications system based on solar cell for supplying power of claim 1, which is characterized in that control Unit processed mainly passes through the integrated and intelligence of voltage-stablizer, Boost-Buck step-up/step-down circuits and the electrical module of accurate adjustable resistance Control method be combined to realize the intelligent control of electrical parameter, and electrochemical measurement pattern and electrolysis mode can automatically or Manual switching.

4. according to a kind of direct current electrochemical applications system based on solar cell for supplying power of claim 1, which is characterized in that electricity Road module operation method is including as follows, and control unit (2) to the waveform generating module built in signal source unit (3) by sending control System instruction carrys out operating mode-potentiostatic mode/constant current mode of selection signal source unit (3), realizes the electricity in output electrode Signal output；The measurement module of measuring unit (4) is by correcting the signal of wave filter in unit (5) and correcting circuit to measurement It is corrected, then the analogue measurement signal after correction is passed via analog/digital conversion module conversion digital signal by serial communication It is defeated to arrive control unit (2), further measurement data is included on computer interface.

5. according to a kind of direct current electrochemical applications system based on solar cell for supplying power of claim 1, which is characterized in that letter Constant potential/Constant current output method of number source unit (4)：When carrying out electrolysis process, the direct current electrochemical applications system Control unit (2) sends control instruction, and sine wave signal generator generates signal with simulation output waveform signal through mlultiplying circuit Superposition, the signal after superposition are amplified again through amplifying circuit, and amplified signal is further across DC/DC conversion module Become being electrolysed required electric signal scope；The amplified signal of amplifying circuit passes through the built-in reference circuit one with microprocessor Exportable corresponding electric signal after secondary calibration；The electric signal of further signal source unit (3) output terminal is carried out by sample circuit Signal sampling, sampled signal realize that signal source unit (3) exports the secondary calibration of signal via the comparison circuit in microprocessor Control unit (2) is fed back to again, and then exports high-precision electric signal；The output signal of signal source unit (3) can be with throughput Electric signal in the range of the corresponding range of journey switching selection output.

6. according to a kind of direct current electrochemical applications system based on solar cell for supplying power of claim 1, which is characterized in that straight The measurement module of the measuring unit (4) of galvanochemistry application system feeds back to measured electric signal in measuring unit (4) Sample circuit realizes frequency simultaneously using 1 FM circuit of signal condition and 2 regulating circuit of signal condition of correction unit (5) With the conditioning of voltage, then it is serially transmitted in control unit (2), and then is shown on computer interface by analog/digital conversion； Wherein the sample circuit of measuring unit (4) determines the sampling period by the clock circuit in measuring unit (4) and buffer circuit And sample frequency.

7. according to a kind of direct current electrochemical applications system based on solar cell for supplying power of claim 6, which is characterized in that school 1 module of signal condition of positive unit (5) realizes that the frequency of measurement module measuring signal is adjusted, the numeral output letter of measurement module Reference frequency built in number frequency and correction unit (5) adds up in phase accumulator, the digital signal storage after adding up In wave memorizer；The digital signal of storage is converted to analog signal by D A switch module, with reference frequency source signal Ripple is filtered off using low-pass filter after being compared, the analog signal of stable frequency is shown on computer interface, it is real The stably measured of existing measuring signal.

8. according to a kind of direct current electrochemical applications system based on solar cell for supplying power of claim 6, which is characterized in that school 2 voltage regulating module of signal condition of positive unit (5) realizes that the voltage of measurement module measuring signal is adjusted, measurement module measuring signal Voltage magnitude by DC/DC conversion module, realize that the voltage magnitude of measuring signal is adjusted, filtered off using filter circuit Ripple, filtered signal further realize the calibration of measuring signal, Ran Hou by correcting the internal regulator circuit of unit (5) The voltage signal of stable amplitude is shown on computer interface, realizes the stably measured of measuring signal.