CN102801201A - Automatic photovoltaic charging post control system - Google Patents
Automatic photovoltaic charging post control system Download PDFInfo
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- CN102801201A CN102801201A CN2012103400365A CN201210340036A CN102801201A CN 102801201 A CN102801201 A CN 102801201A CN 2012103400365 A CN2012103400365 A CN 2012103400365A CN 201210340036 A CN201210340036 A CN 201210340036A CN 102801201 A CN102801201 A CN 102801201A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses an automatic photovoltaic charging post control system. The system consists of a solar cell panel, a Boost type direct current (DC)/DC circuit, a Buck type alternating current (AC)/DC circuit, a digital signal processor (DSP) control system, an intelligent control switch, a change-over switch and a detection circuit. The direct current transmitted by a photovoltaic cell array is subjected to maximum power point tracking through the Boost circuit; and meanwhile, the charging current of the storage battery is intelligently adjusted by adjusting the operating current of the DC/DC circuit, and according to the system, the AC and DC charging of an electric automobile can be realized through on-off control. When a photovoltaic power generation system does not work or the charging current is insufficient, the AC can be automatically switched to charge the storage battery through the intelligent switch, and the good operating state of the storage battery is guaranteed at any time. When the photovoltaic charging post is in grid-connected use on the household photovoltaic roof, the off-peak adjusting function of the power grid can be realized through the storage battery of the electric automobile; and when the photovoltaic charging post is in off-grid independent use, the capacity of the storage battery is configured according to actual conditions.
Description
Technical field
The present invention is a kind of novel photovoltaic charging pile automatic control system, is mainly used in various electric automobile charging piles, the invention belongs to new forms of energy and automatic control technology field.
Background technology
Electric automobile replaces oil as power source with electric energy, has really accomplished the tail gas zero discharge, has cleaning, environmental protection, energy-conservation characteristics, is the focus and the trend of world car industrial development.
Electric automobile charging pile is that batteries of electric automobile provides energy supply, is electric automobile development key link.The charging pile that China uses at present is divided into two kinds of AC and DC charging piles.Alternating-current charging pile is that to adopt the AC charging pattern be to carry the charging pile that the accumulator of electric car of battery charge controller charges, and characteristic is that charger is an onboard system, at present the most of AC charging pattern that adopts of electric automobile; The DC charging stake is the pattern that adopts controlled direct current to charge for the electric powered motor storage battery.The energy source of charging pile is in electrical network at present; And the electric energy of electrical network to be mainly derived from coal be main thermal power generation; Electric automobile only is that the consumption of fossil energy is transferred to the coal generating from automobile like this, can not fundamentally solve the energy and problem of environmental pollution; Along with the development of intelligent grid and perfect, realize that through intelligent charge control the effect of electric automobile " peak load shifting " be unable to do without regenerative resource in addition.Pass through photovoltaic charged stake during renewable energy power generation to charging electric vehicle, electric automobile also can be through photovoltaic charged stake to grid transmission when the electrical network peak of power consumption.The present charging pile of these functions can't be accomplished.Therefore the final developing goal of charging pile is the multifunctional motor-driven vehicle charging stake that combines with regenerative resource, and solar energy power generating is the mode that has development prospect in the regenerative resource most.
In addition, the large-scale relatively charging station of photovoltaic charged stake is more flexible, can be installed in various parkings bay or highway does not have the service area area from net, for the electric automobile of passing by on one's way provides the emergent energy.Therefore, photovoltaic charged stake control system is an important directions of Application of Solar Energy, also is that the universal and development of electric automobile lays the first stone simultaneously.
Summary of the invention
The purpose of this invention is to provide the photovoltaic charged stake automatic control system that a kind of solar energy photovoltaic generating matches with charging pile; Solving existing electric automobile charging pile can only utilize AC network to charge; Can not fundamentally solve energy regeneration and environmental pollution problems; Simultaneously photovoltaic charged stake can be installed in various parkings bay or highway does not have the service area area from net, for electric automobile provides the emergent energy.
The present invention be with the electric energy of solar cell through intelligent controller to charge in batteries, uses direct current or dc inverter is charging electric vehicle as alternating current cooperation charging pile.Maximal power tracing, intelligent accummulator charging, interchange, the direct current of system through coordinating the control solar cell, be incorporated into the power networks, from the intelligence of functions such as net switch, realization electric energy transmitted in both directions and to the function of grid transmission etc.; Can guarantee that photovoltaic charged stake realizes the optimal utilization of solar energy when stabilizing to charging electric vehicle, the compatible present various alternating current-direct current charging piles of this automatic control system.
The present invention can change charging current, solar cell is realized maximal power tracing function etc. according to the charging and discharging of accumulator condition intelligent; Simultaneity factor realizes the coordination Charge Management to storage battery according to solar cell power generation state, automatic big voltage, big electric current or the trickle pattern selected such as electric automobile state, battery tension, current status that insert; Preventing that storage battery from crossing to break through puts; Guarantee that storage battery is in the optimal charge state all the time, improve the useful life of storage battery.Under the intelligent grid condition, intelligent coordinated automatic control system storage battery be full of the electricity situation under the may command photovoltaic generating system with electric energy feed-in electrical network in; Being in peak of power consumption at grid power is that electrical network provides energy by storage battery or electric automobile constantly, can play the peak regulation effect.
Photovoltaic charged stake automatic control system provided by the invention comprises solar cell (1), discharges and recharges control unit (2), storage battery (3), DSP control (4), inversion unit (5), transducer (6), charging electric vehicle (7); Wherein solar cell (1) charges to storage battery (3) through the control unit (2) that discharges and recharges by transducer (6) and DSP control (4) control, and storage battery (3) carries out direct current or AC charging to charging electric vehicle (7) separately or through inversion unit (5) simultaneously;
Discharging and recharging control unit (2) comprising: photovoltaic DC/DC circuit (21), to the interchange AC/DC of charge in batteries circuit (22), intelligent switch K1 (23), intelligent switch K2 (24), two-way change over switch Kab (25) and soft-touch control (26);
Inversion unit (5) comprising: the inverter circuit (51) and the control switch S (52) that is incorporated into the power networks;
Transducer (6) comprising: current sensor Ipv (61) and voltage sensor Vpv (62);
Charging electric vehicle (7) comprising: AC charging circuit (71), dc charging circuit (72);
Photovoltaic DC/DC unit (21) connection of intelligent K switch 1 (23) and DSP control (4), photovoltaic DC/DC unit (21) connects solar cell (1) simultaneously; Exchange AC/DC unit (22) connection of intelligent K switch 1 (23) and intelligent switch K2 (24) simultaneously; Intelligent switch K1 (23) also connects storage battery (3) and DSP control (4) simultaneously; Intelligent switch K2 (24) also connects DSP control (4), DC charging (72) and AC network (8) simultaneously; Two-way change over switch (25) connects DSP control (4), inverter circuit (51), AC charging (71), DC charging (72) and AC network (8) simultaneously; Soft-touch control (26) connects DSP control (4);
Storage battery (3): connect voltage sensor Vpv (62) and inverter circuit (51) simultaneously;
DSP controls (4): also connect inverter circuit (51) simultaneously, the control switch S (52) that is incorporated into the power networks, current sensor Ipv (61), voltage sensor Vpv (62), DC charging (72); DSP control (4) is accomplished maximal power tracing and is controlled with the charging automatic synchronization according to the operating state of current sensor Ipv (61), the detected charging current of voltage sensor Vpv (62) and battery tension signal generation pwm pulse and control signal control photovoltaic DC/DC circuit (21), intelligent switch K1 (23), intelligent switch K2 (24) and the two-way change over switch Kab (25) and control switch S (52) of being incorporated into the power networks;
Inversion unit (5) connects AC network (8) through the control switch S (52) that is incorporated into the power networks;
Charging electric vehicle (7) connects AC network (8) through load (73);
The operating state of the control switch S (52) that is incorporated into the power networks decision inverter circuit, and the state of the control switch S (52) that is incorporated into the power networks is through the operating state decision of DSP control (4) control storage battery and inversion unit.
Do not work or charging current can pass through intelligent switch K1 (23), K2 (24) automatic switchover alternating current to charge in batteries when not enough when photovoltaic generating system, the assurance storage battery is in good working order at any time.Photovoltaic charged stake is incorporated into the power networks on family photovoltaic roof when using, and can realize the regulatory function of avoiding the peak hour of electrical network through accumulator of electric car.
Advantage of the present invention and beneficial effect are:
1, the solar cell output voltage is regulated output voltage and is realized MPPT maximum power point tracking through the Boost topology; And discharge and recharge through adjusting and to coordinate the charging current that control intelligence is regulated storage battery, can change the charging modes of charging pile simultaneously, make the maximum usefulness of photovoltaic generation performance.Also can realize the AC and DC charging of storage battery and electric automobile.Photovoltaic charged stake is incorporated into the power networks on family photovoltaic roof when using, and can cooperate intelligent grid to realize the regulatory function of avoiding the peak hour of electrical network through accumulator of electric car.
2, native system is through detect the output current of solar energy power generating in real time; Maximum power output and charging current through DSP control solar photovoltaic generation system; When photovoltaic generating system is not worked or charging current can guarantee that storage battery is in good working order at any time through intelligent switch automatic switchover alternating current to charge in batteries when not enough.
3, designed K1, K2,2 intelligent control switch and 2 change over switches such as Kab, S in the circuit, wherein 2 intelligent switchs are controlled the break-make of AC charging and AC network respectively, and the automatic switchover alternating current improves rate of energy to charge in batteries.The soft-touch control of charging pile panel is realized the conversion of electric automobile alternating current-direct current charge mode through DSP control transformation K switch ab, and wherein DC charging also can be realized fast charge mode by DSP control.System simultaneously through DSP intelligent control switch S realization system from net, function is incorporated into the power networks.
4, pass through the adjustment of the duty ratio control DC/DC unit realization intelligent charge electric current of adjustment pwm pulse, make system's storage battery and electric automobile Vehicular accumulator cell be in good charged state and realization MPPT maximum power point tracking function all the time.
5, this control system adopts the DSP control circuit, and control is accurate, and hardware circuit is simple, automaticity is high.
Description of drawings
Fig. 1 overall construction drawing;
Fig. 2 theory diagram;
Fig. 3 circuit theory diagrams;
Fig. 4 DSP control principle figure.
Among the figure, 1 solar cell, 2 discharges and recharges control unit, 21 photovoltaic DC/DC circuit, 22 to the interchange AC/DC of charge in batteries circuit, 23 intelligent switch K1,24 intelligent switch K2,25 two-way change over switch Kab, 26 soft-touch controls, 3 storage batterys, 4DSP control, 5 inversion units, 51 inverter circuits, 52 be incorporated into the power networks control switch, 6 transducers, 61 current sensors, 62 voltage sensors, 7 charging electric vehicles, 71 AC chargings, 72 DC chargings, 73 load R
FZ, 8 AC networks.
Embodiment
Novel photovoltaic charging pile automatic control system as shown in Figure 1; By discharge and recharge control unit 2, storage battery 3, DSP control 4, inversion unit 5, transducer 6, charging electric vehicle 7 is formed; Discharge and recharge control unit 2 and connect solar cell 1, charging system for electric automobile 7 connects AC network 8.
Fig. 2 is that theory diagram, Fig. 3 are that circuit theory diagrams, Fig. 4 are DSP control principle figure.
Below in conjunction with accompanying drawing the present invention is described further:
The present invention is designed with the Boost type DC/DC circuit, alternating current of photovoltaic battery array rectification and the compositions such as Buck type AC/DC circuit, intelligent switch and change over switch to charge in batteries.Control system mainly is to utilize DSP to produce the PWM pulse-width signal of control main circuit switch pipe through the voltage and current signal that detects, and produces the control signal of corresponding intelligence and change over switch.
The present invention has designed two intelligent control switch K1 (23), K2 (24), change over switch Kab (25) in discharging and recharging control unit 2, like Fig. 2, shown in Figure 3, Automatic Control Theory is following:
When discharging and recharging intelligent switch K1 (23) initial condition in the control unit (2), contact " a " is connected to contact " b ", promptly connects photovoltaic DC/DC unit (21), and intelligent switch K2 (24) realizes that for breaking off solar cell charges to intelligent accummulator;
When control system detects battery tension and is lower than set point through voltage sensor Vpv (62); DSP control (4) is to intelligent switch K1 (23) sending controling instruction; Make the contact " a " of intelligent switch K1 (23) be connected with contact " c ", intelligent switch K2 (24) closure realizes that alternating current charges to intelligent accummulator; System is the photovoltaic charged state, and its intelligent charging mode receives DSP (4) control.
As the contact of two-way change over switch Kab (25) " b ", " b ' " simultaneously when connecting terminal " a ", " a ' ", load R
FZ(73) connect AC network, electric automobile is the AC network charged state, the charger control that charging control process is carried by electric automobile;
The photovoltaic charged stake control switch S (52) that when net work, is incorporated into the power networks breaks off, as the contact of two-way change over switch Kab (25) " c ", " c ' " connecting terminal " a ", " a ' " simultaneously, load R
FZ(73) connect inverter circuit output, electric automobile is the AC charging state, and charging control process is controlled by the charger that inverter circuit (51) and electric automobile carry jointly;
DSP (4) detects the solar cell output current signal I through DC/DC (21) control according to transducer (61,62)
PV, output voltage signal V
PV, (being the terminal voltage and the charging current of storage battery), produce control circuit IGBT pipe S
PVPulse-width signal PWM
PV(see figure 3) is to realize intelligent charge control and to realize the MPPT maximum power point tracking function.The contact " d " of two-way change over switch Kab this moment (25), " d ' " while connecting terminal " a ", " a ' ", load R
FZ(73) connect storage battery (3) and carry out DC charging, select quick charge or standard charging mode automatically according to the State Control dc charging circuit of electric automobile power battery by DSP control (4) through dc charging circuit (72); When the terminal voltage of storage battery arrived preset maximum, DSP (4) was controlled to be trickle charge; When the terminal voltage that detects storage battery dropped to the minimum value that presets, DSP (4) sending controling instruction made " a " end of intelligent switch 23 be connected with " c " end; Intelligent switch 24 contacts are closed simultaneously, and this moment, alternating current was connected with storage battery through the Buck circuit that exchanges AC/DC (22), sent the pulse-width signal PWM of control IGBT pipe SJL by DSP
JL is to realize intelligent charge control, and control method is with photovoltaic charged identical.
When the user selects electric vehicle alternating-current charging through the soft-touch control (26) of photovoltaic charged stake control panel, the contact " b " of two-way change over switch Kab (25), " b ' " while connecting terminal " a ", " a ' " time, load R
FZ(73) connect AC network, this moment, charging pile was that the user charges with the AC network if S (52) breaks off; If S (52) closure, photovoltaic charged stake with and net state be that the user charges.The state of S (52) is through DSP control storage battery and the decision of inverter operating state.Soft-touch control (26) is through the operating state of DSP control (4) control two-way change over switch Kab (25).
If photovoltaic charged stake is (as building place, highway parking bay in) when net work, the user can select electric vehicle alternating-current charging through the soft-touch control (26) of photovoltaic charged stake control panel, and system transfers inverter automatically to and exchanges output.When selecting the electric automobile DC charging, Kab (25) contact connects dc charging circuit, selects quick charge or standard charging mode by DSP automatically according to the State Control dc charging circuit of electric automobile power battery.
Claims (3)
1. photovoltaic charged stake automatic control system is characterized in that: this control system comprises solar cell (1), discharges and recharges control unit (2), storage battery (3), DSP control (4), inversion unit (5), transducer (6), charging electric vehicle (7); Wherein solar cell (1) charges to storage battery (3) through the control unit (2) that discharges and recharges by transducer (6) and DSP control (4) control, and storage battery (3) carries out direct current or AC charging to charging electric vehicle (7) separately or through inversion unit (5) simultaneously;
Discharging and recharging control unit (2) comprising: photovoltaic DC/DC circuit (21), to the interchange AC/DC of charge in batteries circuit (22), intelligent switch K1 (23), intelligent switch K2 (24), two-way change over switch Kab (25) and soft-touch control (26);
Inversion unit (5) comprising: the inverter circuit (51) and the control switch S (52) that is incorporated into the power networks;
Transducer (6) comprising: current sensor Ipv (61) and voltage sensor Vpv (62);
Charging electric vehicle (7) comprising: AC charging (71), DC charging (72);
Photovoltaic DC/DC unit (21) connection of intelligent K switch 1 (23) and DSP control (4), photovoltaic DC/DC unit (21) connects solar cell (1) simultaneously; Exchange AC/DC unit (22) connection of intelligent K switch 1 (23) and intelligent switch K2 (24) simultaneously; Intelligent switch K1 (23) also connects storage battery (3) and DSP control (4) simultaneously; Intelligent switch K2 (24) also connects DSP control (4), DC charging (72) and AC network (8) simultaneously; Two-way change over switch (25) connects DSP control (4), inverter circuit (51), AC charging (71), DC charging (72) and AC network (8) simultaneously; Soft-touch control (26) connects DSP control (4);
Storage battery (3): connect voltage sensor Vpv (62) and inverter circuit (51) simultaneously;
DSP controls (4): also connect inverter circuit (51) simultaneously, the control switch S (52) that is incorporated into the power networks, current sensor Ipv (61), voltage sensor Vpv (62), DC charging (72); DSP control (4) is accomplished maximal power tracing and is controlled with the charging automatic synchronization according to the operating state of current sensor Ipv (61), the detected charging current of voltage sensor Vpv (62) and battery tension signal generation pwm pulse and control signal control photovoltaic DC/DC circuit (21), intelligent switch K1 (23), intelligent switch K2 (24) and the two-way change over switch Kab (25) and control switch S (52) of being incorporated into the power networks;
Inversion unit (5) connects AC network (8) through the control switch S (52) that is incorporated into the power networks;
Charging electric vehicle (7) connects AC network (8) through load (73);
The operating state of the control switch S (52) that is incorporated into the power networks decision inverter circuit, and the state of the control switch S (52) that is incorporated into the power networks is through DSP control (4) control storage battery and inversion unit operating state.
2. automatic control system according to claim 1; When it is characterized in that discharging and recharging intelligent switch K1 (23) initial condition in the control unit (2); Contact " a " is connected to contact " b "; Promptly connect photovoltaic DC/DC unit (21), intelligent switch K2 (24) realizes that for breaking off solar cell charges to intelligent accummulator;
When control system detects battery tension and is lower than set point through voltage sensor Vpv (62); DSP control (4) is to intelligent switch K1 (23) sending controling instruction; Make the contact " a " of intelligent switch K1 (23) be connected with contact " c "; Intelligent switch K2 (24) closure realizes that alternating current charges to intelligent accummulator.
3. control system according to claim 1 is characterized in that: as the contact of two-way change over switch Kab (25) " b ", " b ' " simultaneously when connecting terminal " a ", " a ' ", and load R
FZ(73) connect AC network, electric automobile is the AC network charged state, the charger control that charging control process is carried by electric automobile;
The photovoltaic charged stake control switch S (52) that when net work, is incorporated into the power networks breaks off, as the contact of two-way change over switch Kab (25) " c ", " c ' " connecting terminal " a ", " a ' " simultaneously, load R
FZ(73) connect inverter circuit output, electric automobile is the AC charging state, and charging control process is controlled by the charger that inverter circuit (51) and electric automobile carry jointly; As the contact of two-way change over switch Kab (25) " d ", " d ' " simultaneously when connecting terminal " a ", " a ' ", load R
FZ(73) connect storage battery (3) and carry out DC charging, select quick charge or standard charging mode automatically according to the State Control dc charging circuit of electric automobile power battery by DSP control (4) through DC charging (72);
As the contact of two-way change over switch Kab (25) " b ", " b ' " simultaneously when connecting terminal " a ", " a ' ", load R
FZ(73) connect AC network, control switch S (52) breaks off if be incorporated into the power networks this moment, and photovoltaic charged stake is that the user charges with the AC network; If control switch S (52) closure that is incorporated into the power networks, photovoltaic charged stake with and net state be that the user charges; The state of control switch S (52) of being incorporated into the power networks determines with inverter circuit (51) operating state through DSP control (4) control storage battery (3).
Soft-touch control (26) is through the operating state of DSP control (4) control two-way change over switch Kab (25).
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| CN2012103400365A CN102801201A (en) | 2012-09-14 | 2012-09-14 | Automatic photovoltaic charging post control system |
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| CN105281385A (en) * | 2014-07-16 | 2016-01-27 | 青岛特锐德电气股份有限公司 | Electric automobile AC-DC charging system and electric automobile AC-DC charging method |
| CN105471075A (en) * | 2016-01-14 | 2016-04-06 | 青岛大学 | Photovoltaic charging unit of electric vehicle |
| CN105552878A (en) * | 2015-12-24 | 2016-05-04 | 珠海格力电器股份有限公司 | DC micro-grid structure |
| CN105553016A (en) * | 2015-12-31 | 2016-05-04 | 深圳市科陆电子科技股份有限公司 | Distributed type photovoltaic energy storage charging pile |
| CN105680553A (en) * | 2015-12-16 | 2016-06-15 | 辽宁立洲能源科技有限公司 | Solar charging pile for gas station |
| CN105751915A (en) * | 2016-05-16 | 2016-07-13 | 蒋小春 | Photovoltaic energy storage direct current quick charging pile |
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| CN106787091A (en) * | 2015-11-23 | 2017-05-31 | 辽宁立洲能源科技有限公司 | A kind of electric drive vehicle charging pile of use solar power plant |
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| CN108422891A (en) * | 2018-05-08 | 2018-08-21 | 张家港清研聚晟新能源科技有限公司 | A kind of photovoltaic charged stake of off-network |
| CN108482173A (en) * | 2018-05-23 | 2018-09-04 | 顺德职业技术学院 | A kind of automatic solar recharging stake and outdoor parking space day by day |
| CN111452657A (en) * | 2020-04-20 | 2020-07-28 | 浙江芯能光伏科技股份有限公司 | Fill energy-conserving automatic control device of electric pile power supply |
| CN113147461A (en) * | 2021-04-01 | 2021-07-23 | 安徽工程大学 | Outdoor stake of charging of intelligent new energy automobile of crashproof |
| CN115425732A (en) * | 2022-07-22 | 2022-12-02 | 北京磊然循环科技有限公司 | Direct battery charging method, device, system and equipment based on photovoltaic panel |
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