CN109831158A - Use for laboratory perovskite solar battery MPPT maximum power point tracking test macro - Google Patents
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- CN109831158A CN109831158A CN201910063076.1A CN201910063076A CN109831158A CN 109831158 A CN109831158 A CN 109831158A CN 201910063076 A CN201910063076 A CN 201910063076A CN 109831158 A CN109831158 A CN 109831158A
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Abstract
The invention proposes a kind of use for laboratory perovskite solar battery MPPT maximum power point tracking test macros, including MCU, I/V conversion circuit and host computer；It is connected between MCU and I/V conversion circuit by D/A conversion circuit and A/D conversion circuit；MCU and host computer communicate；The I/V conversion circuit, the voltage for exporting D/A conversion circuit are applied to perovskite solar battery both ends, and the output electric current of perovskite solar battery is converted to corresponding voltage signal；The A/D conversion circuit, for acquiring the voltage signal of I/V conversion circuit output；Host computer obtains the voltage and current information at perovskite solar battery to be tested both ends after handling the voltage signal of D/A conversion circuit and A/D conversion circuit.The present invention realizes effective tracking and testing of the maximum power point of the other perovskite solar battery of milliwatt in laboratory scope.
Description
Technical field
The present invention relates to the field of test technology more particularly to a kind of use for laboratory perovskite solar battery maximum power points
Tracking testing system.
Background technique
Perovskite solar battery is a kind of novel thin-film solar cells.By the development less than ten years, calcium
The photoelectric conversion efficiency of titanium ore solar battery has reached 23.3%.Perovskite solar battery is prepared using solution methods, is added
Cost is relatively low for work；Meanwhile photoelectric conversion efficiency is high, can match in excellence or beauty monocrystaline silicon solar cell.Therefore, perovskite solar battery
With splendid commercial applications prospect.
Perovskite solar battery forward scan (from short-circuit voltage scanning to open-circuit voltage) and reverse scan are (from open circuit electricity
Short-circuit voltage is arrived in pressure scanning) under the conditions of, obtained I/V curve (i.e. current/voltage curve) is not overlapped, and shows certain sluggishness
Phenomenon, the phenomenon cause independent measurement I/V curve to be difficult accurately to assess the photoelectric conversion performance of perovskite solar battery.One
As for, using continuous output of the constant voltage process test perovskite solar battery at maximum power point, in terms of this
Calculate the photoelectric conversion efficiency of perovskite solar battery.But when there are hysteresis phenomenon, it is difficult accurately from I/V curve
The corresponding voltage of maximum power point is obtained, using this method, since the uncertainty of constant voltage selection will lead to final calculating
Obtained photoelectric conversion efficiency inaccuracy.
Meanwhile the stability of perovskite solar battery is the emphasis of researcher's concern.But generally use at present
There are many stability test methods, such as: perovskite solar battery is stored under specific environment, is surveyed after certain interval of time
Try the I/V curve of battery；Alternatively, testing the lasting output electric current of battery under constant voltage under the conditions of continuous light.Above-mentioned side
Method is all unable to the true stability of perovskite solar battery under accurate response actual operating conditions.Under true application environment,
Perovskite solar battery should work at maximum power point, and intensity of illumination, temperature and humidity can real-time changes.In order to
Solve problem above, it would be desirable to which MPPT maximum power point tracking test equipment is applied in the research of perovskite solar battery.
In fact, MPPT maximum power point tracking test macro is widely used in commercialization area of solar cell, system with
Based on DC-DC conversion circuit, in high-power range, there is extraordinary applicability.But for the calcium in laboratory scope
For titanium ore solar battery, the effective area of battery is usually in 1cm2Within, the current density of battery is less than 24mA/cm2, electricity
The open-circuit voltage in pond is less than 1.2V, and peak power output is less than 28.8 mW.Perovskite solar battery in laboratory scope
Output power is too small, so, commercialized MPPT maximum power point tracking test macro can not be applied to the calcium titanium in laboratory scope
In the research of mine solar battery.For this reason, it may be necessary to which we develop and a kind of novel can be suitable for milliwatt rank small-power calcium titanium
The MPPT maximum power point tracking test macro of mine battery.
Summary of the invention
The present invention in view of the shortcomings of the prior art and defect, provides a kind of use for laboratory perovskite solar battery most
High-power tracking testing system realizes the maximum power of the other perovskite solar battery of the milliwatt in laboratory scope
Effective tracking and testing of point.
In order to achieve the object, the technical scheme adopted by the invention is that:
A kind of use for laboratory perovskite solar battery MPPT maximum power point tracking test macro, including MCU, I/V conversion circuit and
Host computer；It is connected between MCU the and I/V conversion circuit by D/A conversion circuit and A/D conversion circuit；The MCU with it is upper
Machine communication；
The I/V conversion circuit, the voltage for exporting D/A conversion circuit are applied to perovskite solar battery both ends, will
The output electric current of perovskite solar battery is converted to corresponding voltage signal；
The A/D conversion circuit for acquiring the voltage signal of I/V conversion circuit output, and is transmitted to host computer by MCU；
The D/A conversion circuit, it is defeated for specifying output voltage signal to be converted to analog signal host computer by MCU control
Out；
The host computer realizes the control to D/A conversion circuit and A/D conversion circuit by control MCU, and converts electricity to D/A
The voltage signal of road and A/D conversion circuit obtains the voltage and current at perovskite solar battery to be tested both ends after being handled
Information realizes that power is the I/V curved measurement and maximum power of the perovskite solar battery of milliwatt in laboratory scope
The tracking and testing of point output power.
Further, the MCU uses 80C51 series monolithic, PIC single chip microcomputer, AVR single chip, MSP single-chip microcontroller, ARM
Series monolithic, DPS or FPGA.
Further, the I/V conversion circuit includes primary inverter circuit, subtraction circuit and filtering and clamp electricity
Road.
Further, the primary inverter circuit includes calculating amplifier U5, triode Q1, triode Q2 and resistance R10；
The output end of the operational amplifier U5 is separately connected the base stage of triode Q1 and triode Q2, the hair of the triode Q1
Emitter-base bandgap grading is connected with the emitter of triode Q2, and connects resistance between the emitter and operational amplifier U5 of triode Q1 and Q2
R10；Triode Q1, Q2 and resistance R10 constitute negative-feedback circuit；
The anode of the operational amplifier U5 inverting input terminal connection perovskite solar battery, perovskite solar battery are born
Pole ground connection.
Further, the subtraction circuit includes operational amplifier U6 and resistance R12 ~ R15；
It is connected with resistance R12 between the non-inverting input terminal of the operational amplifier U6 and the non-inverting input terminal of operational amplifier U5,
The non-inverting input terminal of operational amplifier U6 is connected with ground resistance R14 simultaneously, and the inverting input terminal of operational amplifier U6 passes through electricity
Resistance R13 is connect with the emitter of the emitter of triode Q1, triode Q2；The output end and inverting input terminal of operational amplifier U6
Between be connected to negative feedback resistor R15.
Further, the filtering and clamp circuit include resistance R16, capacitor C13, diode D2 and diode D3；
The resistance R16 connects the output end of operational amplifier U6 with capacitor C13, the voltage for exporting to operational amplifier U6
It is filtered.
Further, the conversion chip that the D/A conversion circuit uses is TLC5615；6 pins of TLC5615 access
2.5V reference voltage；The non-inverting input terminal of the 7 pins connection operational amplifier U5 of TLC5615.
Further, the conversion chip that the A/D conversion circuit uses is ADS1115；9,10 pins of ADS1115 chip
Connect pull-up resistor R9 and R10；The 4 pins connection filtering of ADS1115 chip and the output end of clamp circuit.
Further, the host computer and MCU pass through serial or parallel interface communication.
The beneficial effects of the present invention are:
The present invention provides a kind of simple and reliable, the other use for laboratory of milliwatt MPPT maximum power point tracking test macro, solutions
Lack the problem of dedicated maximum power point output power tracking testing system in milliwatt of having determined level range.
The present invention, can be with using PC control MCU and the A/D conversion circuit and D/A conversion circuit that are connected with MCU
Perovskite solar battery both ends output voltage is controlled, while acquiring the output electric current of perovskite solar battery；Host computer can
To use Python or any general programming language to realize, facilitate the operation for making full use of computer powerful and control energy
Power writes and realizes more complicated MPPT maximum power point tracking testing algorithm, so as to complete maximum power point more accurately
Tracking and testing.
Detailed description of the invention
Fig. 1 is the structural representation of use for laboratory perovskite solar battery MPPT maximum power point tracking test macro of the present invention
Figure.
Fig. 2 is the schematic diagram of single chip circuit in MCU in the embodiment of the present invention.
Fig. 3 is the schematic diagram of the reset circuit of single-chip microcontroller in the embodiment of the present invention.
Fig. 4 is the I/V conversion electricity of use for laboratory perovskite solar battery MPPT maximum power point tracking test macro of the present invention
The schematic diagram on road.
Fig. 5 is the D/A conversion electricity of use for laboratory perovskite solar battery MPPT maximum power point tracking test macro of the present invention
The schematic diagram on road.
Fig. 6 is the A/D conversion electricity of use for laboratory perovskite solar battery MPPT maximum power point tracking test macro of the present invention
The schematic diagram on road.
Fig. 7 is the schematic diagram of USB communicating circuit in the embodiment of the present invention.
Fig. 8 is the schematic diagram of power circuit in the embodiment of the present invention.
Fig. 9 is the IV curve data figure tested in the embodiment of the present invention.
Figure 10 is the curve data curve graph of the electric current tested in the embodiment of the present invention, voltage and power.
Numbering in the drawing are as follows: 100 be host computer, and 101 be MCU, and 102 be D/A conversion circuit, and 103 be A/D conversion circuit,
104 be I/V conversion circuit.
Specific embodiment
With reference to the accompanying drawing and specific embodiment present invention is further described in detail:
As shown in Figure 1, a kind of use for laboratory perovskite solar battery MPPT maximum power point tracking test macro, including MCU101,
I/V conversion circuit 104 and host computer 100；Between MCU101 the and I/V conversion circuit 104 by D/A conversion circuit 102 and
A/D conversion circuit 103 connects；The MCU101 and host computer 100 communicate；
The I/V conversion circuit 104, the voltage for exporting D/A conversion circuit 102 are applied to perovskite solar battery two
End, is converted to corresponding voltage signal for the output electric current of perovskite solar battery；
The A/D conversion circuit 103 is transmitted for acquiring the voltage signal of the output of I/V conversion circuit 104, and by MCU101
To host computer 100；
Host computer 100 is specified output voltage signal to be converted to mould by the D/A conversion circuit 102 for controlling by MCU101
Quasi- signal output；
The host computer 100 realizes the control to D/A conversion circuit 102 and A/D conversion circuit 103 by control MCU101, and
Perovskite solar-electricity to be tested is obtained after handling the voltage signal of D/A conversion circuit 102 and A/D conversion circuit 103
The voltage and current information at pond both ends, the I/V for carrying out the perovskite solar battery that power in laboratory scope is milliwatt are bent
The tracking and testing of line measurement and maximum power point output power.
The MCU101 is single using 80C51 series monolithic, PIC single chip microcomputer, AVR single chip, MSP single-chip microcontroller, ARM series
Piece machine, DPS or FPGA.
Mode is preferably carried out as one kind, and in the present embodiment, the host computer 100 is programmed using Python
The host computer 100 of realization；The MCU101 uses the single-chip microcontroller of STM32F103C8T6 model；As shown in Fig. 2 ~ 3,
STM32F103C8T6 single-chip microcontroller connects 3.3V power supply, while there are two crystal oscillating circuit, the ends PDO and PD1 of single-chip microcontroller for single-chip microcontroller connection
Mouth is connected with the crystal oscillating circuit that frequency is 8MHz, and the port PC14 and PC15 of single-chip microcontroller is connected with the crystal oscillator that frequency is 32768Hz
Circuit；The port NRST of single-chip microcontroller is connected with reset circuit, and key SW1, resistance R2 and capacitor C3 are provided in reset circuit.
The I/V conversion circuit 104 includes primary inverter circuit, subtraction circuit and filtering and clamp circuit.
Specifically, as shown in figure 4, the primary inverter circuit includes calculating amplifier U5, triode Q1, triode Q2 and electricity
Hinder R10；The output end of the operational amplifier U5 is separately connected the base stage of triode Q1 and triode Q2, the triode Q1's
Emitter is connected with the emitter of triode Q2, and the anti-phase input of the emitter of triode Q1 and Q2 and operational amplifier U5
Resistance R10 is connected between end；Triode Q1, Q2 and resistance R10 constitute negative-feedback circuit；The operational amplifier U5 anti-phase input
The anode of end connection perovskite solar battery, the cathode ground connection of perovskite solar battery.Due to the effect of negative-feedback circuit,
The voltage at perovskite solar battery both ends is equal with the voltage V that D/A conversion circuit 102 exports；Perovskite solar battery is defeated
Electric current is I out, is converted to voltage signal after resistance R10, specifically, the voltage of c point is (V-I*R10) in Fig. 4.
The subtraction circuit includes operational amplifier U6, resistance R12 ~ R15；The operational amplifier U6's is same mutually defeated
Enter and be connected with resistance R12 between end and the non-inverting input terminal of operational amplifier U5, while the non-inverting input terminal of operational amplifier U6
It is grounded by resistance R14, the inverting input terminal of operational amplifier U6 passes through emitter, the triode of resistance R13 and triode Q1
The emitter of Q2 connects；The output end and anti-phase input of operational amplifier U6 is terminated with negative feedback resistor R15.
The filtering and clamp circuit include resistance R16, capacitor C13, diode D2 and diode D3；The resistance R16
The output end that operational amplifier U6 is connected with capacitor C13, the voltage for exporting to operational amplifier U6 are filtered；Specifically
, diode D2 and diode D3 are as clamp circuit, by output voltage clamp 0 between 3.3V, preventing A/D conversion circuit
103 input voltage is excessively high, leads to the damage of conversion chip ADS1115.
As an embodiment, what the operational amplifier U5 in the present embodiment and operational amplifier U6 was all made of is type
Number amplifier for being OP07, resistance R10 is accurate adjustable resistance, and resistance value is 0 ~ 100 Ω, and resistance R12 ~ R15 is accurate adjustable
Resistance, resistance value are 0 ~ 20 Ω, and triode Q1 and Q2 are low-power transistor S9013 and S9012.
Specifically, as shown in figure 5, the conversion chip that uses of the D/A conversion circuit 102 is TLC5615；The 7 of TLC5615
The non-inverting input terminal of pin connection operational amplifier U5；Wherein, the 1 of TLC5615,2,3,4 pins are separately connected
PA7, PA5, PA4 and PA6 pin of STM32F103C8T6 single-chip microcontroller；6 pins of TLC5615 are connected with by diode D1
TL431 chip, TL431 chip generate 2.5V reference voltage.
Specifically, as shown in fig. 6, the conversion chip that uses of the A/D conversion circuit 103 is ADS1115；ADS1115 core
9,10 pins of piece connect pull-up resistor R9 and R10；The 4 pins connection filtering of ADS1115 chip and the output end of clamp circuit；
Wherein, 9,10 pins of ADS1115 chip are drawn by the PB6 and PB7 that I2C communication bus connects STM32F103C8T6 single-chip microcontroller
Foot, the resistance value of the pull-up resistor R9 and R10 are 10K Ω.
The host computer 100 and MCU101 passes through serial or parallel interface communication.It is preferably carried out mode as one kind, this
In embodiment, host computer 100 and MCU101 is communicated by USB communicating circuit, as shown in fig. 7, STM32F103C8T6 monolithic
PA12 with the PA13 pin of machine connects USB interface, and host computer 100 in USB data line access interface by can be realized and monolithic
The communication of machine.
As an embodiment, in the present embodiment, D/A conversion circuit 102 directly provides 5V work electricity by USB interface
Pressure, A/D conversion circuit 103 and MCU provide 3.3V operating voltage by power circuit.Specifically, as shown in figure 8, power circuit packet
Voltage-stablizer AMS1117-3.3V, capacitor C6 ~ C8 and inductance L1 are included, the input voltage of voltage-stablizer is the 5V voltage that USB interface provides,
Output voltage is 3.3V.
The working principle of use for laboratory perovskite solar battery MPPT maximum power point tracking test macro of the present invention are as follows:
The anode of perovskite solar battery connects the inverting input terminal of operational amplifier U5, and D/A conversion circuit 102 is put with operation
The non-inverting input terminal connection of big device U5, due to the effect of negative-feedback circuit, the voltage and D/A at perovskite solar battery both ends turn
The voltage V for changing the output of circuit 102 is equal；The output electric current I of perovskite solar battery is converted to voltage letter after resistance R10
Number, c point voltage is (V-I*R10) in Fig. 4；Operational amplifier U6 and R12 ~ R15 constitute subtraction circuit, when R12 ~ R15 resistance value
When equal, the d point voltage of operational amplifier U6 output is that a point voltage subtracts c point voltage V (a)-V (c), i.e. I*R10, d point voltage
After resistance R16 and capacitor C13 filtering, digital signal is converted to by A/D conversion circuit 103, is sent to single-chip microcontroller, monolithic
Machine is responsible for for digital signal being sent to host computer 100；
Host computer 100 controls 102 output voltage of D/A conversion circuit and from open-circuit voltage is reduced to short-circuit voltage or from short-circuit voltage
Open-circuit voltage is risen to, and acquires corresponding A/D signal, after operation, obtains the IV curve of perovskite solar battery.
Host computer 100 is write with Python and realizes MPPT maximum power point tracking testing algorithm, according to the calcium collected
The voltage and current signals at titanium ore solar battery both ends determine the output voltage of next step D/A circuit 102, to guarantee calcium
Titanium ore solar battery always works at maximum power point.Complicated MPPT maximum power point tracking meter is realized in host computer 100
It calculates, to more accurately complete MPPT maximum power point tracking test.
In order to verify the performance of MPPT maximum power point tracking test macro of the invention, a battery sample is selected, and to electricity
The IV curve and maximum power point in pond are tested, test battery sample used be small-power used in slim calculator too
Positive energy cell piece, as shown in Figure 9；Stain in figure is MPPT maximum power point tracking test macro measured data, and solid black lines are number
Word source table (Keithley 2450) tests obtained curve.As can be seen from Figure, test battery sample output voltage be 0 ~
In 2.0V voltage range, the data for data and the digital sourcemeter test that system testing of the invention obtains are essentially coincided.In the survey
Under the conditions of examination, the voltage of the maximum power point of battery sample is 1.1V, and electric current is 3.32 × 10-4MA, power are 3.65 × 10- 4mW。
Figure 10 gives during the test, MPPT maximum power point tracking test macro actual test obtain electric current, voltage and
The curve data of power；For the tracking performance of test macro, initial output voltage is set as 0.9V, with the increasing of testing time
Adding, output voltage is gradually adjusted to ~ 1.1V or so, it can be deduced that system of the invention has preferable MPPT maximum power point tracking
Energy.
MPPT maximum power point tracking test macro provided by the invention, the milliwatt rank perovskite solar energy in laboratory scope
The true photoelectric conversion performance assessment of battery and true environment stability inferior research aspect have widely application prospect.
The embodiment of the above, only presently preferred embodiments of the present invention, not limits practical range of the invention,
Therefore all equivalent change or modifications done according to structure, feature and principle described in the invention patent range, it should be included in this hair
In bright claim.
Claims (9)
1. a kind of use for laboratory perovskite solar battery MPPT maximum power point tracking test macro, which is characterized in that including MCU
(101), I/V conversion circuit (104) and host computer (100)；The MCU(101) and I/V conversion circuit (104) between pass through D/A
Conversion circuit (102) and A/D conversion circuit (103) connection；The MCU(101) it is communicated with host computer (100)；
The I/V conversion circuit (104), for the voltage that D/A conversion circuit (102) export to be applied to perovskite solar-electricity
The output electric current of perovskite solar battery is converted to corresponding voltage signal by pond both ends；
The A/D conversion circuit (103) for acquiring the voltage signal of I/V conversion circuit (104) output, and passes through MCU
(101) host computer (100) are transmitted to；
The D/A conversion circuit (102), for passing through MCU(101) it controls and specifies output voltage signal to turn for host computer (100)
It is changed to analog signal output；
The host computer (100) passes through control MCU(101), it realizes to D/A conversion circuit (102) and A/D conversion circuit (103)
Control, and obtain calcium to be tested after handling the voltage signal of D/A conversion circuit (102) and A/D conversion circuit (103)
The voltage and current information at titanium ore solar battery both ends realizes that power is the perovskite solar energy of milliwatt in laboratory scope
The I/V curved measurement of battery and the tracking and testing of maximum power point output power.
2. use for laboratory perovskite solar battery MPPT maximum power point tracking test macro according to claim 1, special
Sign is, the MCU(101) using 80C51 series monolithic, PIC single chip microcomputer, AVR single chip, MSP single-chip microcontroller, ARM series
Single-chip microcontroller, DPS or FPGA.
3. use for laboratory perovskite solar battery MPPT maximum power point tracking test macro according to claim 1, special
Sign is that the I/V conversion circuit (104) includes primary inverter circuit, subtraction circuit and filtering and clamp circuit.
4. use for laboratory perovskite solar battery MPPT maximum power point tracking test macro according to claim 3, special
Sign is that the primary inverter circuit includes calculating amplifier U5, triode Q1, triode Q2 and resistance R10；
The output end of the operational amplifier U5 is separately connected the base stage of triode Q1 and triode Q2, the hair of the triode Q1
Emitter-base bandgap grading is connected with the emitter of triode Q2, and connects resistance between the emitter and operational amplifier U5 of triode Q1 and Q2
R10；Triode Q1, Q2 and resistance R10 constitute negative-feedback circuit；
The anode of the operational amplifier U5 inverting input terminal connection perovskite solar battery, perovskite solar battery are born
Pole ground connection.
5. use for laboratory perovskite solar battery MPPT maximum power point tracking test macro according to claim 3, special
Sign is that the subtraction circuit includes operational amplifier U6 and resistance R12 ~ R15；
It is connected with resistance R12 between the non-inverting input terminal of the operational amplifier U6 and the non-inverting input terminal of operational amplifier U5,
The non-inverting input terminal of operational amplifier U6 is connected with ground resistance R14 simultaneously, and the inverting input terminal of operational amplifier U6 passes through electricity
Resistance R13 is connect with the emitter of the emitter of triode Q1, triode Q2；The output end and inverting input terminal of operational amplifier U6
Between be connected to negative feedback resistor R15.
6. use for laboratory perovskite solar battery MPPT maximum power point tracking test macro according to claim 3, special
Sign is that the filtering and clamp circuit include resistance R16, capacitor C13, diode D2 and diode D3；
The resistance R16 connects the output end of operational amplifier U6 with capacitor C13, the voltage for exporting to operational amplifier U6
It is filtered.
7. use for laboratory perovskite solar battery MPPT maximum power point tracking test macro according to claim 4, special
Sign is that the conversion chip that the D/A conversion circuit (102) uses is TLC5615；6 pins of TLC5615 access 2.5V benchmark
Voltage；The non-inverting input terminal of the 7 pins connection operational amplifier U5 of TLC5615.
8. use for laboratory perovskite solar battery MPPT maximum power point tracking test macro according to claim 6, special
Sign is that the conversion chip that the A/D conversion circuit (103) uses is ADS1115；9,10 pins of ADS1115 chip connect
Pull-up resistor R9 and R10；The 4 pins connection filtering of ADS1115 chip and the output end of clamp circuit.
9. use for laboratory perovskite solar battery MPPT maximum power point tracking test macro according to claim 1, special
Sign is, the host computer (100) and MCU(101) passes through serial or parallel interface communication.
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| CN201392382Y (en) * | 2009-04-30 | 2010-01-27 | 于培诺 | Generating energy testing instrument of solar cell component |
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| CN105629809A (en) * | 2014-10-30 | 2016-06-01 | 陕西高华知本化工科技有限公司 | Electro-hydraulic servo valve feedback controller |
| CN206075182U (en) * | 2016-08-26 | 2017-04-05 | 安徽鑫龙自动化有限公司 | A kind of DC current stabilized power supply |
| CN206146893U (en) * | 2016-10-26 | 2017-05-03 | 沈阳计量测试院 | Dead -stop titration appearance calibrating device |
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2019
- 2019-03-08 CN CN201910063076.1A patent/CN109831158B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201392382Y (en) * | 2009-04-30 | 2010-01-27 | 于培诺 | Generating energy testing instrument of solar cell component |
| CN203405695U (en) * | 2013-08-13 | 2014-01-22 | 中国电子科技集团公司第四十一研究所 | Voltage controlled current signal generator of solar battery array simulator |
| CN105629809A (en) * | 2014-10-30 | 2016-06-01 | 陕西高华知本化工科技有限公司 | Electro-hydraulic servo valve feedback controller |
| CN206075182U (en) * | 2016-08-26 | 2017-04-05 | 安徽鑫龙自动化有限公司 | A kind of DC current stabilized power supply |
| CN206146893U (en) * | 2016-10-26 | 2017-05-03 | 沈阳计量测试院 | Dead -stop titration appearance calibrating device |
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