CN103852623B - Condenser type photovoltaic cell voltage x current harvester - Google Patents
Condenser type photovoltaic cell voltage x current harvester Download PDFInfo
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Abstract
The present invention provides a kind of condenser type photovoltaic cell voltage x current harvester, including sampling module, voltage signal measurement module, current signal measurement module, MCU signal processing module and manual gear selecting module；Manual gear selecting module is for selecting measurement gear according to tested photovoltaic cell parameter, and selective stage signal is sent to voltage signal measurement module through MCU signal processing module and current signal measurement module determines measurement gear；The voltage and current signal of the output by the photovoltaic cell of collection for the sampling module carries out sampling and be transferred to respectively voltage signal measurement module and current signal measurement module is amplified, filtering process, and treated signal is sent to be uploaded to higher level's monitoring device after MCU signal processing module is processed and uses.Circuit structure of the present invention is simple, cost is relatively low, sampling precision is higher, the sampling period is short, easy to operate and good operating stability.
Description
Technical field
The present invention relates to the measure voltage & current technical field of photovoltaic cell output, be specifically related to a kind of voltage of utilizing capacitor charge and discharge technology to export photovoltaic cell, device that electric current is acquired.
Background technology
Currently, the application of solar electrical energy generation is more and more extensive.During solar electrical energy generation, the voltage to photovoltaic cell output, electric current is needed to carry out real-time sampling, to meet the monitoring demand of upper level system or power network dispatching system.At present, photovoltaic power station monitoring system is mainly provided with equipment by inverter manufacturer, due to inverter, manufacturer is numerous, each inverter factory end is all from our factory's inverter, select the voltage x current harvester of corresponding photovoltaic cell, the product of different vendor each other cannot be compatible, thus brings difficulty to the work of solar power station actual monitored；The monitoring of solar power station is difficult to form convenient, unified monitoring system.Additionally, one of major defect of photovoltaic generation is that the photoelectric transformation efficiency of solar battery array is too low, for solving this problem, the important channel using at present is to use MPPT maximum power point tracking (MPPT) technology, by the real-time operating point adjusting photovoltaic cell to reaching the maximization of photovoltaic battery array power output.The first step implementing MPPT maximum power point tracking (MPPT) technology is the voltage to photovoltaic battery array output, electric current is sampled, and it is for the device of sampling at present, its circuit structure is relative complex, and sampling precision is not high, and the sampled measurements time is longer and less stable.
Content of the invention
It is an object of the invention to: for deficiency of the prior art, provide that a kind of circuit structure is simple, cost is relatively low, sampling precision is higher, the sampling period is short, the condenser type photovoltaic cell voltage x current harvester of easy to operate and good operating stability.
The technical scheme is that the condenser type photovoltaic cell voltage x current harvester of the present invention, it is structurally characterized in that: include sampling module, voltage signal measurement module, current signal measurement module, MCU signal processing module and manual gear selecting module；
Above-mentioned sampling module is provided with the first signal input part, secondary signal input, the first control signal input, the second control signal input, voltage signal output end and current signal output end；Voltage signal measurement module is provided with voltage signal inputs, the first selective stage signal input, the second selective stage signal input and voltage signal output end；Current signal measurement module is provided with current signal input, the first selective stage signal input, the second selective stage signal input and current signal output end；MCU signal processing module is provided with the first control end, the second control end, the first selective stage signal output, the second selective stage signal output, the 3rd selective stage signal output, the 4th selective stage signal output, voltage signal inputs, current signal input, selective stage signal input and voltage and current signal output；Manual gear selecting module is provided with signal output part and power end；
First signal input part of sampling module and secondary signal input distinguish the positive pole of corresponding and tested photovoltaic cell when using and negative electricity is connected；First control signal input of sampling module and the second control signal input corresponding the first control end with MCU signal processing module and the second control end signal respectively electrically connect；The voltage signal inputs of voltage signal measurement module electrically connects with the voltage signal output end signal of sampling module；First selective stage signal input of voltage signal measurement module and the second selective stage signal input correspondence respectively electrically connects with the first selective stage signal output and the second selective stage signal output end signal of MCU signal processing module；The voltage signal inputs of MCU signal processing module electrically connects with the voltage signal output end signal of voltage signal measurement module；The current signal input of current signal measurement module electrically connects with the current signal output end signal of sampling module；First selective stage signal input of current signal measurement module and the second selective stage signal input correspondence respectively electrically connects with the 3rd selective stage signal output and the 4th selective stage signal output end signal of MCU signal processing module；The current signal input of MCU signal processing module electrically connects with the current signal output end signal of current signal measurement module；The selective stage signal input of MCU signal processing module electrically connects with the selective stage signal output end signal of manual gear selecting module；The power end of manual gear selecting module connects+5V dc source when using；The voltage and current signal output of MCU signal processing module electrically connects with higher level's monitoring device signal when using；
Above-mentioned sampling module includes electrochemical capacitor C, FET S1, FET S2With sample rate current resistance R；
The positive level of above-mentioned electrochemical capacitor C and FET S2Drain electrode form a common junction because of conllinear, this common junction is the first signal input part of above-mentioned sampling module, simultaneously also for the voltage signal output end of above-mentioned sampling module；The negative pole of electrochemical capacitor C, FET S2Source electrode and FET S1Drain conllinear；FET S1One end of drain electrode and sample rate current resistance R form a common junction because of conllinear, this common junction is the current signal output end of above-mentioned sampling module；The other end of sample rate current resistance R is both for the secondary signal input of above-mentioned sampling module；FET S2Grid be the first control signal input of sampling module；FET S1Grid be the second control signal input of sampling module；
Above-mentioned voltage signal measurement module includes MUX U1, reverse proportion operational amplifier T1, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, resistance R5, resistance Rf1 and filter capacitor C1；MUX U1 is provided with the first selection input, the second selection input, the 3rd selection input, the first address mouth A0, the second address mouth A1And signal output part；The first address mouth A of MUX U10It is the first selective stage signal input of above-mentioned voltage signal measurement module；The second address mouth A of MUX U11It is the second selective stage signal input of above-mentioned voltage signal measurement module；
Divider resistance R1One end be the voltage signal inputs of above-mentioned voltage signal measurement module；Divider resistance R1The other end, divider resistance R2One end and MUX U1 first selection input conllinear；Divider resistance R2The other end, divider resistance R3One end and MUX U1 second selection input conllinear；Divider resistance R3The other end, divider resistance R4One end and MUX U1 the 3rd selection input conllinear；Resistance R5One end electrically connect with the signal output part of MUX U1；Resistance R5The other end, the inverting input conllinear of one end of resistance Rf1 and reverse proportion operational amplifier T1；One end of the output of reverse proportion operational amplifier T1, one end of resistance Rf1 and filter capacitor C1 forms a common junction because of conllinear, and this common junction is the voltage signal output end of above-mentioned voltage signal measurement module；The positive of reverse proportion operational amplifier T1, divider resistance R4The other end and the other end of filter capacitor C1 be all grounded；
Above-mentioned current signal measurement module includes MUX U2, reverse proportion operational amplifier T2, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance Rf2 and filter capacitor C2；MUX U2 is provided with the first selection input, the second selection input, the 3rd selection input, the first address mouth A2, the second address mouth A3And signal output part；The first address mouth A of MUX U22It is the first selective stage signal input of above-mentioned current signal measurement module；The second address mouth A of MUX U23It is the second selective stage signal input of above-mentioned current signal measurement module；
Resistance R6One end be the current signal input of above-mentioned current signal measurement module；Resistance R6The other end, resistance R7One end and MUX U2 first selection input conllinear；Resistance R7The other end, resistance R8One end and MUX U2 second selection input conllinear；Resistance R8The other end, resistance R9One end and MUX U2 the 3rd selection input conllinear；Resistance R10One end electrically connect with the signal output part of MUX U2；Resistance R10The other end, the inverting input conllinear of one end of resistance Rf2 and reverse proportion operational amplifier T2；One end of the output of reverse proportion operational amplifier T2, one end of resistance Rf2 and filter capacitor C2 forms a common junction because of conllinear, and this common junction is the current signal output end of above-mentioned current signal measurement module；The positive of reverse proportion operational amplifier T2, resistance R9The other end and the other end of filter capacitor C2 be all grounded；
Above-mentioned manual gear selecting module includes plucking number sign switch, resistance R11, resistance R12, resistance R13With resistance R14；Above-mentioned plucking number sign switch is the rotary encoder of LJV model；Plucking number sign switch has A, B, C, L, R wiring pin；The A wiring pin of plucking number sign switch, B wiring pin, resistance R11One end and resistance R12One end form a common junction because of conllinear, this common junction is the power end of aforesaid manual gear selecting module；The L wiring pin of plucking number sign switch, resistance R11The other end and resistance R13One end conllinear；The R wiring pin of plucking number sign switch, resistance R12The other end and resistance R14One end conllinear；The C wiring pin of plucking number sign switch, resistance R13The other end and resistance R14The other end form a common junction because of conllinear, this common junction is the selective stage signal output of aforesaid manual gear selecting module.
Further scheme is: above-mentioned FET S1With FET S2FET for F1010E model；Above-mentioned electrochemical capacitor C is the electrochemical capacitor of 6800 μ F/50V.
Further scheme also has: above-mentioned MUX U1, MUX U2 is the MUX of CD4051 model；Reverse proportion operational amplifier T1, reverse proportion operational amplifier T2 are the operational amplifier of OPA333 model.
The present invention has a positive effect: the condenser type photovoltaic cell voltage x current harvester of (1) present invention, its than with traditional photovoltaic cell data acquisition unit, circuit structure is simple, cost is relatively low, easy to operate, good operating stability.(2) the condenser type photovoltaic cell voltage x current harvester of the present invention, according to the parameter of tested photovoltaic cell, uses stepping formula measuring method, and sampling precision is higher, the sampling period is short.(3) the condenser type photovoltaic cell voltage x current harvester of the present invention, can use in rugged environment, and applicability is strong.
Brief description
Fig. 1 is the circuit structure block diagram of the condenser type photovoltaic cell voltage x current harvester of the present invention, also show the electrical connection of itself and photovoltaic cell E in figure；
Fig. 2 is the electrical schematic diagram of the sampling module in Fig. 1, also show the electrical connection of itself and photovoltaic cell E in figure；
Fig. 3 is the electrical schematic diagram of the voltage signal measurement module in Fig. 1；
Fig. 4 is the electrical schematic diagram of the current signal measurement module in Fig. 1；
Fig. 5 is the electrical schematic diagram of the manual gear selecting module in Fig. 1.
Detailed description of the invention
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings.
(embodiment 1)
See Fig. 1, the condenser type photovoltaic cell voltage x current harvester of the present embodiment, it mainly is made up of sampling module, voltage signal measurement module, current signal measurement module, MCU signal processing module and manual gear selecting module.
Sampling module is provided with the first signal input part, secondary signal input, the first control signal input, the second control signal input, voltage signal output end and current signal output end；Voltage signal measurement module is provided with voltage signal inputs, the first selective stage signal input, the second selective stage signal input and voltage signal output end；Current signal measurement module is provided with current signal input, the first selective stage signal input, the second selective stage signal input and current signal output end；MCU signal processing module is provided with the first control end, the second control end, the first selective stage signal output, the second selective stage signal output, the 3rd selective stage signal output, the 4th selective stage signal output, voltage signal inputs, current signal input, selective stage signal input and voltage and current signal output；Manual gear selecting module is provided with signal output part and power end.
When first signal input part of sampling module and secondary signal input use, correspondence is connected with positive pole and the negative electricity of photovoltaic cell E respectively；First control signal input of sampling module and the second control signal input corresponding the first control end with MCU signal processing module and the second control end signal respectively electrically connect；The voltage signal inputs of voltage signal measurement module electrically connects with the voltage signal output end signal of sampling module；First selective stage signal input of voltage signal measurement module and the second selective stage signal input correspondence respectively electrically connects with the first selective stage signal output and the second selective stage signal output end signal of MCU signal processing module；The voltage signal inputs of MCU signal processing module electrically connects with the voltage signal output end signal of voltage signal measurement module；The current signal input of current signal measurement module electrically connects with the current signal output end signal of sampling module；First selective stage signal input of current signal measurement module and the second selective stage signal input correspondence respectively electrically connects with the 3rd selective stage signal output and the 4th selective stage signal output end signal of MCU signal processing module；The current signal input of MCU signal processing module electrically connects with the current signal output end signal of current signal measurement module；The selective stage signal input of MCU signal processing module electrically connects with the selective stage signal output end signal of manual gear selecting module；The power end of manual gear selecting module connects+5V dc source when using；The voltage and current signal output of MCU signal processing module electrically connects with higher level's monitoring device signal when using.
Seeing Fig. 2, aforesaid sampling module is mainly by electrochemical capacitor C, FET S1, FET S2With sample rate current resistance R composition.The positive level of electrochemical capacitor C and FET S2Drain electrode form a common junction because of conllinear, this common junction is the first signal input part of aforesaid sampling module, simultaneously also for the voltage signal output end (marking U in figure) of sampling module；The negative pole of electrochemical capacitor C, FET S2Source electrode and FET S1Drain conllinear.FET S1One end of drain electrode and sample rate current resistance R form a common junction because of conllinear, this common junction is the current signal output end (marking I in figure) of aforesaid sampling module；The other end of sample rate current resistance R is both for the secondary signal input of aforesaid sampling module；FET S2Grid be the first control signal input of sampling module；FET S1Grid be the second control signal input of sampling module.In the present embodiment, FET S1With FET S2Preferably employ the FET of F1010E model.Electrochemical capacitor C preferably employs the electrochemical capacitor of 6800 μ F/50V.
Seeing Fig. 3, voltage signal measurement module is mainly by MUX U1, reverse proportion operational amplifier T1, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, resistance R5, resistance Rf1 and filter capacitor C1 composition.MUX U1 the present embodiment preferably employs the MUX of CD4051 model；Reverse proportion operational amplifier T1 preferably employs the operational amplifier of OPA333 model.MUX U1 is provided with the first selection input, the second selection input, the 3rd selection input, the first address mouth A0, the second address mouth A1And signal output part.The first address mouth A of MUX U10It is the first selective stage signal input of aforesaid voltage signal measurement module；The second address mouth A of MUX U11It is the second selective stage signal input of aforesaid voltage signal measurement module；
Divider resistance R1One end be the voltage signal inputs of aforesaid voltage signal measurement module；Divider resistance R1The other end, divider resistance R2One end and MUX U1 first selection input conllinear；Divider resistance R2The other end, divider resistance R3One end and MUX U1 second selection input conllinear；Divider resistance R3The other end, divider resistance R4One end and MUX U1 the 3rd selection input conllinear；Resistance R5One end electrically connect with the signal output part of MUX U1；Resistance R5The other end, the inverting input conllinear of one end of resistance Rf1 and reverse proportion operational amplifier T1；One end of the output of reverse proportion operational amplifier T1, one end of resistance Rf1 and filter capacitor C1 forms a common junction because of conllinear, and this common junction is the voltage signal output end of aforesaid voltage signal measurement module；The positive of reverse proportion operational amplifier T1, divider resistance R4The other end and the other end of filter capacitor C1 be all grounded.
Seeing Fig. 4, current signal measurement module is mainly by MUX U2, reverse proportion operational amplifier T2, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance Rf2 and filter capacitor C2 composition.MUX U2 the present embodiment preferably employs the MUX of CD4051 model；Reverse proportion operational amplifier T2 preferably employs the operational amplifier of OPA333 model.MUX U2 is provided with the first selection input, the second selection input, the 3rd selection input, the first address mouth A2, the second address mouth A3And signal output part.The first address mouth A of MUX U22It is the first selective stage signal input of aforesaid current signal measurement module；The second address mouth A of MUX U23It is the second selective stage signal input of aforesaid current signal measurement module；
Resistance R6One end be the current signal input of aforesaid current signal measurement module；Resistance R6The other end, resistance R7One end and MUX U2 first selection input conllinear；Resistance R7The other end, resistance R8One end and MUX U2 second selection input conllinear；Resistance R8The other end, resistance R9One end and MUX U2 the 3rd selection input conllinear；Resistance R10One end electrically connect with the signal output part of MUX U2；Resistance R10The other end, the inverting input conllinear of one end of resistance Rf2 and reverse proportion operational amplifier T2；One end of the output of reverse proportion operational amplifier T2, one end of resistance Rf2 and filter capacitor C2 forms a common junction because of conllinear, and this common junction is the current signal output end of aforesaid current signal measurement module；The positive of reverse proportion operational amplifier T2, resistance R9The other end and the other end of filter capacitor C2 be all grounded.
Seeing Fig. 5, manual gear selecting module is mainly by plucking number sign switch, resistance R11, resistance R12, resistance R13With resistance R14Composition.Plucking number sign switch the present embodiment preferably employs the rotary encoder of LJV model.Plucking number sign switch has A, B, C, L, R wiring pin；The A wiring pin of plucking number sign switch, B wiring pin, resistance R11One end and resistance R12One end form a common junction because of conllinear, this common junction is the power end of aforesaid manual gear selecting module；The L wiring pin of plucking number sign switch, resistance R11The other end and resistance R13One end conllinear；The R wiring pin of plucking number sign switch, resistance R12The other end and resistance R14One end conllinear；The C wiring pin of plucking number sign switch, resistance R13The other end and resistance R14The other end form a common junction because of conllinear, this common junction is the selective stage signal output of aforesaid manual gear selecting module.
MCU signal processing module mainly includes the integrated chip of the MCU of STC12C5A16S2 model.It after MCU signal processing module is used for measuring gear selecting and gathers control, and the voltage that received, current signal carry out calculating, process, is sent to higher level's monitoring device by its voltage and current signal output and uses.
The operation principle of the condenser type photovoltaic cell voltage x current harvester of the present embodiment is summarized as follows with the course of work:
The condenser type photovoltaic cell voltage x current harvester of the present embodiment, during use, first the parameter according to photovoltaic cell, selecting corresponding voltage, electric current gear: wherein gear selects the plucking number sign switch Artificial Control of manually gear selecting module, selective stage signal is by being respectively fed to the address mouth (A of the MUX of voltage signal measurement module and current signal measurement module after MCU signal processing module0、A1And A2、A3).Further, the FET S in now MCU signal processing module control sampling module2For conducting state, FET S1For cut-off state, to ensure not store on electric capacity energy, it is ensured that the degree of accuracy of measurement；Now, voltage and electric current (the MCU control FET S of current time is gathered while electrochemical capacitor C is charged by photovoltaic cell1For conducting state, FET S2For cut-off state).Voltage or the current signal of collection are amplified by voltage signal measurement module and current signal measurement module respectively, filtering process after, voltage, current waveform signal are sent into MCU signal processing module and processed, obtaining magnitude of voltage and the current value signals of high-precision photovoltaic cell, the signal after being processed by MCU signal processing module is uploaded to higher level's monitoring device and uses.
To sum up, the condenser type photovoltaic cell voltage x current harvester of the present embodiment, its than with traditional photovoltaic cell data acquisition unit, circuit structure is simple, cost is relatively low, easy to operate, good operating stability；Can use stepping formula measuring method according to the parameter of tested photovoltaic cell, sampling precision is higher, the sampling period is short；Can use in rugged environment, applicability is strong.
Above example is the explanation of the detailed description of the invention to the present invention; rather than limitation of the present invention; person skilled in the relevant technique is without departing from the spirit and scope of the present invention; can also make various conversion and change and obtain corresponding equivalent technical scheme, therefore all equivalent technical schemes all should be included into the scope of patent protection of the present invention.
Claims (3)
1. a condenser type photovoltaic cell voltage x current harvester, it is characterised in that: include sampling module, voltage signal measurement module, current signal measurement module, MCU signal processing module and manual gear selecting module；
Described sampling module is provided with the first signal input part, secondary signal input, the first control signal input, the second control signal input, voltage signal output end and current signal output end；Voltage signal measurement module is provided with voltage signal inputs, the first selective stage signal input, the second selective stage signal input and voltage signal output end；Current signal measurement module is provided with current signal input, the first selective stage signal input, the second selective stage signal input and current signal output end；MCU signal processing module is provided with the first control end, the second control end, the first selective stage signal output, the second selective stage signal output, the 3rd selective stage signal output, the 4th selective stage signal output, voltage signal inputs, current signal input, selective stage signal input and voltage and current signal output；Manual gear selecting module is provided with signal output part and power end；
First signal input part of sampling module and secondary signal input distinguish the positive pole of corresponding and tested photovoltaic cell when using and negative electricity is connected；First control signal input of sampling module and the second control signal input corresponding the first control end with MCU signal processing module and the second control end signal respectively electrically connect；The voltage signal inputs of voltage signal measurement module electrically connects with the voltage signal output end signal of sampling module；First selective stage signal input of voltage signal measurement module and the second selective stage signal input correspondence respectively electrically connects with the first selective stage signal output and the second selective stage signal output end signal of MCU signal processing module；The voltage signal inputs of MCU signal processing module electrically connects with the voltage signal output end signal of voltage signal measurement module；The current signal input of current signal measurement module electrically connects with the current signal output end signal of sampling module；First selective stage signal input of current signal measurement module and the second selective stage signal input correspondence respectively electrically connects with the 3rd selective stage signal output and the 4th selective stage signal output end signal of MCU signal processing module；The current signal input of MCU signal processing module electrically connects with the current signal output end signal of current signal measurement module；The selective stage signal input of MCU signal processing module electrically connects with the selective stage signal output end signal of manual gear selecting module；The power end of manual gear selecting module connects+5V dc source when using；The voltage and current signal output of MCU signal processing module electrically connects with higher level's monitoring device signal when using；
Described sampling module includes electrochemical capacitor C, FET S1, FET S2With sample rate current resistance R；
The positive level of described electrochemical capacitor C and FET S2Drain electrode form a common junction because of conllinear, this common junction is the first signal input part of described sampling module, simultaneously also for the voltage signal output end of described sampling module；The negative pole of electrochemical capacitor C, FET S2Source electrode and FET S1Drain conllinear；FET S1One end of drain electrode and sample rate current resistance R form a common junction because of conllinear, this common junction is the current signal output end of described sampling module；The other end of sample rate current resistance R is both for the secondary signal input of described sampling module；FET S2Grid be the first control signal input of sampling module；FET S1Grid be the second control signal input of sampling module；
Described voltage signal measurement module includes MUX U1, reverse proportion operational amplifier T1, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, resistance R5, resistance Rf1 and filter capacitor C1；MUX U1 is provided with the first selection input, the second selection input, the 3rd selection input, the first address mouth A0, the second address mouth A1And signal output part；The first address mouth A of MUX U10It is the first selective stage signal input of described voltage signal measurement module；The second address mouth A of MUX U11It is the second selective stage signal input of described voltage signal measurement module；
Divider resistance R1One end be the voltage signal inputs of described voltage signal measurement module；Divider resistance R1The other end, divider resistance R2One end and MUX U1 first selection input conllinear；Divider resistance R2The other end, divider resistance R3One end and MUX U1 second selection input conllinear；Divider resistance R3The other end, divider resistance R4One end and MUX U1 the 3rd selection input conllinear；Resistance R5One end electrically connect with the signal output part of MUX U1；Resistance R5The other end, the inverting input conllinear of one end of resistance Rf1 and reverse proportion operational amplifier T1；One end of the output of reverse proportion operational amplifier T1, one end of resistance Rf1 and filter capacitor C1 forms a common junction because of conllinear, and this common junction is the voltage signal output end of described voltage signal measurement module；The positive of reverse proportion operational amplifier T1, divider resistance R4The other end and the other end of filter capacitor C1 be all grounded；
Described current signal measurement module includes MUX U2, reverse proportion operational amplifier T2, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance Rf2 and filter capacitor C2；MUX U2 is provided with the first selection input, the second selection input, the 3rd selection input, the first address mouth A2, the second address mouth A3And signal output part；The first address mouth A of MUX U22It is the first selective stage signal input of described current signal measurement module；The second address mouth A of MUX U23It is the second selective stage signal input of described current signal measurement module；
Resistance R6One end be the current signal input of described current signal measurement module；Resistance R6The other end, resistance R7One end and MUX U2 first selection input conllinear；Resistance R7The other end, resistance R8One end and MUX U2 second selection input conllinear；Resistance R8The other end, resistance R9One end and MUX U2 the 3rd selection input conllinear；Resistance R10One end electrically connect with the signal output part of MUX U2；Resistance R10The other end, the inverting input conllinear of one end of resistance Rf2 and reverse proportion operational amplifier T2；One end of the output of reverse proportion operational amplifier T2, one end of resistance Rf2 and filter capacitor C2 forms a common junction because of conllinear, and this common junction is the current signal output end of described current signal measurement module；The positive of reverse proportion operational amplifier T2, resistance R9The other end and the other end of filter capacitor C2 be all grounded；
Described manual gear selecting module includes plucking number sign switch, resistance R11, resistance R12, resistance R13With resistance R14；Described plucking number sign switch is the rotary encoder of LJV model；Plucking number sign switch has A, B, C, L, R wiring pin；The A wiring pin of plucking number sign switch, B wiring pin, resistance R11One end and resistance R12One end form a common junction because of conllinear, this common junction is the power end of aforesaid manual gear selecting module；The L wiring pin of plucking number sign switch, resistance R11The other end and resistance R13One end conllinear；The R wiring pin of plucking number sign switch, resistance R12The other end and resistance R14One end conllinear；The C wiring pin of plucking number sign switch, resistance R13The other end and resistance R14The other end form a common junction because of conllinear, this common junction is the selective stage signal output of aforesaid manual gear selecting module.
2. condenser type photovoltaic cell voltage x current harvester according to claim 1, it is characterised in that: described FET S1With FET S2FET for F1010E model；Described electrochemical capacitor C is the electrochemical capacitor of 6800 μ F/50V.
3. condenser type photovoltaic cell voltage x current harvester according to claim 1, it is characterised in that: described MUX U1, MUX U2 is the MUX of CD4051 model；Reverse proportion operational amplifier T1, reverse proportion operational amplifier T2 are the operational amplifier of OPA333 model.
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| CN106443156B (en) * | 2016-10-31 | 2023-06-30 | 成都雅骏新能源汽车科技股份有限公司 | Electric automobile current measurement circuit |
| CN110333457B (en) * | 2018-03-28 | 2021-04-16 | 上海汽车集团股份有限公司 | Power battery pack voltage sampling circuit, power system and new energy automobile |
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