CN107947621A - The high-power PWM grid-connected inverter circuits of 96 pulse instantaneous values feedback of multichannel - Google Patents
The high-power PWM grid-connected inverter circuits of 96 pulse instantaneous values feedback of multichannel Download PDFInfo
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- CN107947621A CN107947621A CN201711349611.7A CN201711349611A CN107947621A CN 107947621 A CN107947621 A CN 107947621A CN 201711349611 A CN201711349611 A CN 201711349611A CN 107947621 A CN107947621 A CN 107947621A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses the high-power PWM grid-connected inverter circuits of 96 pulse instantaneous values feedback of multichannel, it is made of 16 phase-shifting transformers, 16 groups of three-phase bridge type converters and net side trap type LCL filter circuits, the combination which is connected using transformer alternating side windings in series, DC side；Using based on low frequency PWM modulation scheme on-off mode of the sampling with reference to phase shift of staggering the time so that each group inverter drive signal staggers certain phase between each other, and the current waveform of high quality is obtained in net side.Pulse modulation technology is introduced multi-pulse inverter control by the present invention, using voltage and current instantaneous values feedback technology, multiple-pulse current transformer output waveform is completed to adjust, realize grid-connected low-voltage, high-current power conversion, realize net side waveform and the optimum balance of efficiency, have broad prospect of application in D.C. high voltage transmission and large capacity generation of electricity by new energy occasion.
Description
Technical field
The present invention relates to high-power PWM inverter circuits, particularly a kind of 96 pulse three phase inversion of phase shift based on multichannel
The Instantaneous control scheme of the PWM of circuit and three times fundamental frequency.
Background technology
High-power parallel network reverse power supply is in generation of electricity by new energy, static reactive generator (SVG), static synchronous compensator
(STATCOM) and the occasion such as D.C. high voltage transmission has a wide range of applications, its high-power transformation of electrical energy feature causes inverse
It is higher to become power device voltage and current stress in circuit, brings difficulty to device selection, in addition high power contravariant circuit is to complete machine
Efficiency and AC side Power Factor have strict requirements, it is contemplated that requirements above and feature, current power rectifier scheme
Mainly there are connection in series-parallel, more level and the multiple-pulse phase-shifting transformer assembled scheme of power device.
Power device series parallel arrangement can improve its equivalent voltage electric current quota, but corresponding power device connection in series-parallel is adopted
Pressure and sharing control strategy reduce the reliability of rectifier, make its output characteristics be difficult to optimize.Multi-level rectifying electricity
By the equal component voltage of the consistent switching device of multiple parameters in road, so as to improve power system capacity and equivalent switching frequency, current is more
Level scheme mainly has three kinds of diode-clamped, striding capacitance type and cascade connection type structures, in order to obtain preferable current on line side ripple
Shape simultaneously improves net side power factor, and power device switching frequency still will reach several kHz, this to large capacity inverter circuit still
It is so higher, and as level number improves, inverter circuit structure and control program tend to be complicated, therefore actually use more with three electricity
Based on flat, the scheme of more level still has a large amount of control problems to need to explore.Multiple-pulse scheme is by the consistent three-phase of multiple structures
The exchange side of inverter circuit is connected to three phase network by phase-shifting transformer coupled modes, and it is corresponding to rationally design three-phase inverter
The phase shift angle of outlet side phase-shifting transformer, can eliminate the specific times harmonic of inverter ac side, realize grid-connected current just
Stringization is built, and the Waveform sine of the more exchange side structures of the number of modules combined is higher, but module number increase need to cause
The careful design of corresponding phase-shifting transformer phase shift angle is difficult, it is difficult to the optimization design between multiple winding turns ratios, so that
Offset the sineization output advantage that the module number increase of combination is brought.
Multiple-pulse inverter circuit is chiefly used in high-power passive inverter occasion, and power device is opened using power frequency in its inverter circuit
Pass mode, it is possible to achieve the transformation of electrical energy of high-effect high-quality, but multi-pulse inverter output waveform adjusts difficult and power frequency and opens
The problems such as dynamic response that pass mode is brought is slow constrains it, and to be used for generation of electricity by new energy, SVG and STATCOM etc. grid-connected
Inversion occasion.
The content of the invention
The purpose of the present invention is：A kind of high-power PWM grid-connected inverter circuits of 96 pulse instantaneous values feedback of multichannel are provided,
Pulse modulation technology (PWM) is introduced to the control of multi-pulse inverter, and uses voltage and current instantaneous values feedback technology, is realized more
The output waveform of pulse converter is adjusted, so as to fulfill its grid-connected power conversion.
The present invention technical solution be：The high-power PWM parallel network reverses electricity of the 96 pulse instantaneous values feedback of multichannel
16 phase-shifting transformers, 16 groups of three-phase bridge type converters and net side trap type LCL filter circuits composition are route, this is 16 logical
The combination that 96 Pulse Inverter of road is connected using transformer alternating side windings in series, DC side；Using based on sampling of staggering the time
With reference to the low frequency PWM modulation scheme on-off mode of phase shift so that each group inverter drive signal staggers certain phase between each other
Position, the current waveform of high quality is obtained in net side.
Wherein, the 16 passage grid-connected inverter circuits are by completely the same 24 Pulse Inverter of four-way of four groups of structures
DC side series AC sidesway is combined to obtain, the output of every group of inverter by four passage three-phase inverters by phase shift it is star-like-
Triangular form is transformer coupled to be obtained；The inverter side winding of passage 1 and passage 2 all uses star-like connection, and grid side winding by
Double winding forms, A phases a1x1/a2x2, B phase b1y1/b2y2, C phase c1z1c/2z2, rationally designs winding turns ratio and complications
Connection mode, forms the phase shift connection mode of 7.5 degree and advanced 7.5 degree of hysteresis；The transformer inverter side of passage 3 and passage 4
Winding is connected using triangular form, and grid side winding connection is connected with passage 1 with the correspondence transformer winding of passage 2；By
30 degree of phase differences of star-like triangular form winding of transformer secondary winding and the relation of reasonable turn ratio, control passage 1 and passage 3
And 30 degree of drive signal misphase between passage 2 and 4, ± 1 subharmonic of 6k in exchange side output waveform is eliminated, it is first group comprehensive
The passage 1,3 and passage 2 of 24 Pulse Inverters, the phase shift angle of 4 transformer primary side winding ± 7.5 degree, control between them
15 degree of type of drive of misphase, that is, eliminate ± 1 subharmonic of 12k of exchange side output, make to comprise only 24k ± 1 time in exchange side waveform
Harmonic wave；The control signal of the completely the same each passage of 24 Pulse Inverters of second group to the 4th group structure is relative to first group of correspondence
Channel control signals stagger 3.75 degree successively so that after four groups of inverter ac side outputs are by transformer coupled superposition, output
± 1 subharmonic of 24k ± 1,48k in waveform is significantly suppressed；The 16 passage inverters connect in diagram transformer winding
Connect under mode and drive signal staggers on the basis of 3.75 degree successively, 96 staircase waveform harmonic waves of output are concentrated mainly on 96k ± 1
It is secondary.
Wherein, the 96 pulse gird-connected inverters use the space vector modulation of 3 times of fundamental frequencies, three-phase inverter
8 basic vector V0~V7It is distributed in complex coordinates system；The space of instantaneous values feedback based on DC voltage and current on line side
Vector PWM control strategies are：DC voltage samples and reference voltageCompare its error and pass through proportional and integral controller, output
Given as watt currentThe active and reactive current of net side is obtained by coordinate transform after current on line side is sampled and is givenCompare, its error passes through current regulator, and output obtains the reference quantity of rest frame by coordinate inverse transformation；In order to enable
Reference vector and output voltage vector same-phase, rotationAfter electrical angle, pass through three times sample frequency space vector modulation of staggering the time
The control signal of passage 1 to 4 is obtained, the control signal of second group to the 4th group of 24 Pulse Inverters is by first group of respective channel
Signal lagObtain.
Wherein, the control signal of the three-phase inverter of 16 passages staggers between each otherControl mode realize
96 staircase waveform of net side exports, its switching signal is common by digital signal processor TMS28035 combinations FPGA (XC3S400)
Calculate and occur, the work that wherein DSP undertakes is sampling, calculating, sends data and control instruction to FPGA, the work that FPGA undertakes
It is that the instruction progress logic sent according to DSP compares generation SVPWM signals, while is postponing certain electrical angle, obtains it
The control signal of its three group of 24 pulse three phase inverter.
The present invention has the following advantages：16 transformers of 16 passage, 96 pulse PWM inverter there was only two kinds of specifications, it is necessary to
The winding of design only has four kinds of winding datas, and Project Realization is easy；The rectifier under the fundamental frequency working method of three times i.e.
Realize the net side waveform of high quality, realize net side waveform and the optimum balance of efficiency；Other eight passages current transformer DC side
Can also Parallel opertation, realize low-voltage, high-current power conversion, the circuit structure is in D.C. high voltage transmission and the new energy of large capacity
Source power generation occasion has broad prospect of application.
Brief description of the drawings
Fig. 1 is 96 pulse gird-connected inverter circuit structures；
Fig. 2 is three-phase inverter；
Fig. 3 is the system control block figure of 3 times of fundamental frequency PWM based on voltage and current instantaneous values feedback；
Fig. 4 is the control structure of DSP28035 combinations FPGA；
Fig. 5 is the PWM switching waveforms and 96 pulse output voltage waveforms of 3 times of fundamental frequencies.
Embodiment
Technical scheme is further illustrated below in conjunction with the accompanying drawings, but is not understood that it is limitation of the present invention.
As shown in Figs. 1-5, the high-power PWM grid-connected inverter circuits of the 96 pulse instantaneous values feedback of multichannel are by 16 shiftings
Phase transformer, 16 groups of three-phase bridge type converters and net side trap type LCL filter circuits composition, 16 passage, the 96 pulse inversion
The combination that device is connected using transformer alternating side windings in series, DC side；In order to adapt to the quick dynamic of grid-connected inverting system
Respond and take into account the requirement of large power high efficiency power conversion, using based on low frequency PWM modulation scheme of the sampling with reference to phase shift of staggering the time
On-off mode so that each group inverter drive signal staggers certain phase between each other, and the electric current of high quality is obtained in net side
Waveform.
As shown in Figure 1, the 16 passage grid-connected inverter circuits are by completely the same 24 pulse of four-way of four groups of structures
Inverter direct-flow side series AC sidesway is combined to obtain, and every group of inverter output passes through phase shift by four passage three-phase inverters
Star-triangle type is transformer coupled to be obtained；The inverter side winding of passage 1 and passage 2 all uses star-like connection, and grid side around
Group forms (A phases a1x1/a2x2, B phase b1y1/b2y2, C phase c1z1c/2z2) by double winding, rationally designs this double winding circle
Than and tortuous connection mode as shown in Figure 5, form the phase shift connection mode of 7.5 degree and advanced 7.5 degree of hysteresis；3 He of passage
The transformer inverter side winding of passage 4 is connected using triangular form, and grid side winding connection is the same as passage 1 and passage 2
Corresponding transformer winding connection；Star-like triangular form winding 30 degree of phase differences and reasonable turn ratio by transformer secondary winding
30 degree of drive signal misphase between relation, control passage 1 and passage 3 and passage 2 and 4, eliminates in exchange side output waveform
± 1 subharmonic of 6k, the passage 1,3 of comprehensive first group of 24 Pulse Inverter and passage 2, the shifting of 4 transformer primary side winding ± 7.5 degree
Phase angle, controls 15 degree of type of drive of misphase between them, that is, eliminates ± 1 subharmonic of 12k of exchange side output, make exchange side
± 1 subharmonic of 24k is comprised only in waveform；The control of the completely the same each passage of 24 Pulse Inverters of second group to the 4th group structure
Signal staggers 3.75 degree successively relative to first group of respective channel control signal so that four groups of inverter ac side outputs pass through change
After depressor coupling superposition, ± 1 subharmonic of 24k ± 1,48k in output waveform is significantly suppressed；As shown in figure 4, described 16
Passage inverter is under transformer winding connection mode and drive signal staggers on the basis of 3.75 degree successively, 96 ladders of output
Ripple harmonic wave is concentrated mainly on 96k ± 1 time, lays the foundation to obtain the current on line side of high quality.
As shown in Fig. 2, space vector modulation of the 96 pulse gird-connected inverters using 3 times of fundamental frequencies, three contraries
Become 8 basic vector (V of device0~V7) be distributed in complex coordinates system, Tables 1 and 2 is 8 in a power frequency period basic arrows
The order of amount effect；Fig. 3 shows the space vector PWM control plan of the instantaneous values feedback based on DC voltage and current on line side
Slightly, DC voltage sampling and reference voltageCompare its error by proportional and integral controller, export as watt current to
It is fixedThe active and reactive current of net side is obtained by coordinate transform after current on line side is sampled and is givenCompare, its error warp
Overcurrent adjuster, output obtain the reference quantity of rest frame by coordinate inverse transformation；In order to enable reference vector and output
Voltage vector same-phase, rotationAfter electrical angle, by staggering the time, three times sample frequency space vector modulation obtains passage 1 to 4
Control signal, the control signal of second group to the 4th group of 24 Pulse Inverters is by first group of respective channel signal lag
Arrive.
The corresponding switch combination situation of 1 eight space vectors of table
3 times of each passage three-phase inverter fundamental frequency space vector modulation 6 of table 2 sector vector order of action
As shown in figure 4, the control signal of the three-phase inverter of 16 passages staggers between each otherControlling party
Formula realizes that 96 staircase waveform of net side exports, its switching signal is by digital signal processor TMS28035 combinations FPGA
(XC3S400) common calculate occurs, and the work that wherein DSP undertakes is sampling, calculating, sends data and control instruction to FPGA,
The work that FPGA undertakes is that the instruction progress logic sent according to DSP compares generation SVPWM signals, while is being postponed necessarily
Electrical angle, obtains the control signal of other three group of 24 pulse three phase inverter.
Claims (4)
1. the high-power PWM grid-connected inverter circuits of 96 pulse instantaneous values feedback of multichannel, it is characterized in that：It is by 16 phase shifts
Transformer, 16 groups of three-phase bridge type converters and net side trap type LCL filter circuits composition, 16 passage, 96 Pulse Inverter
The combination connected using transformer alternating side windings in series, DC side；Using based on low frequency of the sampling with reference to phase shift of staggering the time
PWM modulation scheme on-off mode so that each group inverter drive signal staggers certain phase between each other, is obtained in net side high
The current waveform of quality.
2. the high-power PWM grid-connected inverter circuits of 96 pulse instantaneous values feedback of multichannel according to claim 1, its feature
It is：The 16 passage grid-connected inverter circuits are connected by the completely the same 24 Pulse Inverter DC side of four-way of four groups of structures
Exchange side phase shift synthesizes to obtain, and every group of inverter output passes through phase shift star-triangle type transformation by four passage three-phase inverters
Device couples to obtain；The inverter side winding of passage 1 and passage 2 all uses star-like connection, and grid side winding is by double winding group
Into A phases a1x1/a2x2, B phase b1y1/b2y2, C phase c1z1c/2z2, rationally designs winding turns ratio and tortuous connection mode, shape
Into 7.5 degree and advanced 7.5 degree of phase shift connection mode of hysteresis；The transformer inverter side winding of passage 3 and passage 4 uses triangle
Type connects, and grid side winding connection is connected with passage 1 with the correspondence transformer winding of passage 2；By transformer secondary around
30 degree of phase differences of star-like triangular form winding of group and the relation of reasonable turn ratio, control passage 1 and passage 3 and passage 2 and 4
Between 30 degree of drive signal misphase, eliminate ± 1 subharmonic of 6k in exchange side output waveform, comprehensive first group of 24 Pulse Inverter
Passage 1,3 and passage 2, the phase shift angle of 4 transformer primary side winding ± 7.5 degree, control 15 degree of the misphase driving between them
Mode, that is, eliminate ± 1 subharmonic of 12k of exchange side output, make to comprise only ± 1 subharmonic of 24k in exchange side waveform；Second group is arrived
The control signal of the completely the same each passage of 24 Pulse Inverters of 4th group of structure is relative to first group of respective channel control signal
Stagger successively 3.75 degree so that after the output of four groups of inverter ac sides is by transformer coupled superposition, 24k in output waveform ±
1st, ± 1 subharmonic of 48k is significantly suppressed；The 16 passage inverters are in the case where illustrating transformer winding connection mode and drive
Dynamic signal staggers on the basis of 3.75 degree successively, and 96 staircase waveform harmonic waves of output are concentrated mainly on 96k ± 1 time.
3. the high-power PWM grid-connected inverter circuits of 96 pulse instantaneous values feedback of multichannel according to claim 1, its feature
It is：The 96 pulse gird-connected inverters are using the space vector modulation of 3 times of fundamental frequencies, 8 basic arrows of three-phase inverter
Amount V0~V7 is distributed in complex coordinates system；The space vector PWM of instantaneous values feedback based on DC voltage and current on line side
Control strategy is：DC voltage samples and reference voltageCompare its error by proportional and integral controller, output, which is used as, to be had
Work(given value of currentThe active and reactive current of net side is obtained by coordinate transform after current on line side is sampled and is givenCompare,
Its error passes through current regulator, and output obtains the reference quantity of rest frame by coordinate inverse transformation；In order to enable with reference to arrow
Amount and output voltage vector same-phase, rotationAfter electrical angle, by staggering the time, three times sample frequency space vector modulation is led to
The control signal in road 1 to 4, the control signal of second group to the 4th group of 24 Pulse Inverters are stagnant by first group of respective channel signal
AfterwardsObtain.
4. the high-power PWM grid-connected inverter circuits of 96 pulse instantaneous values feedback of multichannel according to claim 3, its feature
It is：The control signal of the three-phase inverter of 16 passages staggers between each otherControl mode realize 96 rank of net side
Terraced ripple output, its switching signal are to calculate to occur jointly by digital signal processor TMS28035 combinations FPGA (XC3S400),
The work that wherein DSP undertakes is sampling, calculating, sends data and control instruction to FPGA, and the work that FPGA undertakes is according to DSP
The instruction sent carries out logic and compares generation SVPWM signals, while is postponing certain electrical angle, obtains other three group of 24 arteries and veins
Rush the control signal of three-phase inverter.
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| CN201711349611.7A CN107947621B (en) | 2017-12-15 | 2017-12-15 | High-power PWM grid-connected inverter circuit with multi-channel 96-pulse instantaneous value feedback |
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| CN201711349611.7A CN107947621B (en) | 2017-12-15 | 2017-12-15 | High-power PWM grid-connected inverter circuit with multi-channel 96-pulse instantaneous value feedback |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109795347A (en) * | 2019-01-08 | 2019-05-24 | 信首富云电科技(深圳)有限公司 | A kind of electric bicycle intelligent wireless charging method |
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| CN101521467A (en) * | 2008-11-14 | 2009-09-02 | 浙江大学 | High-frequency distribution transformer |
| CN103036468A (en) * | 2013-01-21 | 2013-04-10 | 南京航空航天大学 | Current source type bidirectional multipulse converter based on polarity-variable direct current bus |
| WO2014056742A2 (en) * | 2012-10-10 | 2014-04-17 | Abb Technology Ag | Controlling a mocular converter |
| CN206250993U (en) * | 2016-12-05 | 2017-06-13 | 淮阴工学院 | A kind of high-power PWM rectification circuits of the pulse of combined type 48 |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101521467A (en) * | 2008-11-14 | 2009-09-02 | 浙江大学 | High-frequency distribution transformer |
| WO2014056742A2 (en) * | 2012-10-10 | 2014-04-17 | Abb Technology Ag | Controlling a mocular converter |
| CN103036468A (en) * | 2013-01-21 | 2013-04-10 | 南京航空航天大学 | Current source type bidirectional multipulse converter based on polarity-variable direct current bus |
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| CN109795347A (en) * | 2019-01-08 | 2019-05-24 | 信首富云电科技(深圳)有限公司 | A kind of electric bicycle intelligent wireless charging method |
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