CN106059110B - A kind of constant current-constant pressure wireless charging system and its charging method - Google Patents
A kind of constant current-constant pressure wireless charging system and its charging method Download PDFInfo
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Abstract
A kind of constant current-constant pressure wireless charging system of present invention proposition and its charging method, the system include：Inverter, primary-side circuitry, secondary side switch circuit, regulator rectifier circuit；High frequency inverter is used to provide energy for system, and exports the frequency and voltage for meeting system requirements；Primary-side circuitry generates the high-frequency current unrelated with secondary-side circuitry parameter at transmitting coil；After secondary side switch circuit receives radio energy, switching secondary-side circuitry topology is controlled by switching, completes switching of the constant-current charge to constant-voltage charge；DC current, voltage of the alternating current, voltage commutation that regulator rectifier circuit is used to obtain in secondary side switch circuit as battery charging.The present invention is by the switching control of constant current/constant voltage mode, the receiving side for being placed on wireless charging system carries out, the data communication and information exchange of energy transmitting side and receiving side are avoided, and ensure that in pattern switching and course of normal operation the zero idle of wireless charging system.
Description
Technical field
The present invention relates to the wireless charging field of battery, especially a kind of constant current-constant pressure wireless charging system and its charging
Method.
Background technology
Wireless power transmission technology has many advantages, such as that traditional wire transmission mode is unexistent, and utilization is wirelessly real
It now charges to small portable apparatus such as mobile phones, then can greatly improve the flexibility used and comfort, and no longer
Carry the power cord of redundancy.
Often, the transmission with storage of electric energy are of equal importance, therefore rely on the biography that wireless power transmission technology solves energy
While defeated problem, it is also desirable to solve the efficient storage of energy well.The common energy storage device in our peripheries is battery at present,
Especially based on lithium battery, and for lithium battery, constant current (CC), constant pressure (CV) charging are most common charging modes,
The entire charging process of lithium battery is divided into two stages of constant-current charge and constant-voltage charge by it.And for general radio energy
For charging system, the charging to realization CC to CV switches, and the primary side in wireless system is needed to increase DC transfer circuit,
This adds increased the costs and difficulty of system design.But it is present studies have shown that by rational circuit design, wirelessly
Electric energy transmission system itself can be achieved on constant current or constant pressure output.If using the property of radio energy transmission system itself
Matter realizes that CC and CV chargings also can reduced cost then can not only reduce the design difficulty of system.In addition to this, if not having
Accurate theory deduction in practical applications using the system designed by theoretical parameter can deviate battery charging requirement surely.
Invention content
Goal of the invention：In order to solve the above technical problems, provide one kind can only by switch control without change circuit its
In the case of his parameter, realize that the circuit that constant current switches to constant-voltage charge, the present invention propose a kind of constant current-constant pressure wireless charging system
System and its charging method.
Technical solution：Technical solution proposed by the present invention is：
A kind of constant current-constant pressure wireless charging system, including：It is inverter, primary-side circuitry, secondary side switch circuit, whole
Flow regulator circuit；
Primary-side circuitry is by compensation inductance LX, compensating electric capacity CpWith the LCL resonance circuits of transmitting coil composition；Emission lines
The inductance of circle is Lp, internal resistance R；
Secondary side switch circuit includes receiving coil, compensating electric capacity Cs1、Cs2, compensation inductance LYWith switch S1、S2、S3；It receives
The inductance of coil is Ls, internal resistance R；Receiving coil, Cs1And LYIt is sequentially connected in series, the both ends of the series circuit are as secondary side switch
The output end of circuit is simultaneously connected with the input terminal of regulator rectifier circuit, the output end of regulator rectifier circuit as constant current-constant pressure without
The output end of micro USB electric system；S1、S3Respectively with Cs1And LYIt is in parallel；S2One end and Cs2It is connected, the other end and LYAnd Cs1Tie point
It is connected, Cs2The other end be connected with the output end of secondary side switch circuit；
Inverter is by the primary-side circuitry formation electric current unrelated with secondary side switch circuit parameter and by emitting electricity
Feel LpIt is coupled to the reception inductance L of secondary side switch circuits；The output frequency of inverter is with output voltage in charging process
It remains unchanged；
The LX=Lp, Ls=LY, Cs1=Cs2。
The present invention also proposes a kind of charging method of constant current-constant pressure wireless charging system, including step：
(1) above-mentioned constant current-constant pressure wireless charging system is built；
(2) parameter setting is carried out to the constant current-constant pressure wireless charging system built in step (1)：According to electricity to be charged
The nominal voltage U in pondbat,nDefault constant-current charge electric current Ibat, L is determined according to the transmitting that uses, receiving coil typep、Ls, R with
And the mutual inductance M between transmitting, receiving coil；According to Ubat,n、Ibat、Lp、Ls, R and M determine the output voltage U of inverterin, it is humorous
Rest parameter in angular frequency of shaking and constant current-constant pressure wireless charging system：Cp、Cs1、Cs2；
(3) the virtual voltage U of battery to be charged is detectedbat, judge whether to meet Ubat< Ubat,n；If judging result is full
Foot, then closure switch S1、S2, disconnect S3, treat rechargeable battery and carry out constant-current charge until Ubat≥Ubat,n；If judging result is not
Meet Ubat< Ubat,n, then abandon charging；
(4) when the virtual voltage of battery to be charged meets U under constant-current chargebat≥Ubat,nWhen, disconnect switch S1、S2, and
It is closed S3, treat rechargeable battery and carry out constant-voltage charge until constant-voltage charge current value is less than or equal to preset threshold value Imin。
Further, the method for parameter setting is in the step (2)：
(3-1) sets Cp=C1, Cs1=Cs2=C2, LX=Lp=L1, Ls=LY=L2；Inverter is calculated according to known parameters
Output voltage UinWith resonance angular frequency：
Req,bat=Ubat,n/Ibat (3)
In formula, UEFor pressure drop caused by diode in regulator rectifier circuit；
(3-2) calculates C according to resonance angular frequency ω1、C2Value be：
Advantageous effect：Compared with prior art, the present invention has the advantage that：
(1) to the switching control of the detection of battery parameter and constant pressure and constant current mode, it is placed on the reception of wireless charging system
Side (battery side) carries out, and avoid or reduces the data communication and information exchange of energy transmitting side and receiving side；
(2) topological transformation is simple with switching, increases the reliability of system switching action；
(3) it ensure that the zero idle of wireless charging system in pattern switching and course of normal operation, reduce power supply
Design difficulty and the utilization rate for improving power supply；
(4) before and after the switching of constant-current charge and constant-voltage charge, the parameter constant of transmitting terminal and system is kept, is improved reliable
Property.
(5) Parameters design provided by the present invention can be with the accuracy of the more theoretical output of lifting system reality output.
Description of the drawings
Fig. 1 is the circuit diagram of constant current of the present invention-constant pressure wireless charging system；
Fig. 2 is the charging flow figure of constant current of the present invention-constant pressure wireless charging system.
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.
The present invention proposes a kind of constant current-constant pressure wireless charging system, including：High frequency inverter, primary-side circuitry, secondary
Side switching circuit, regulator rectifier circuit, battery；Wherein, battery is the charging object of constant current-constant pressure wireless charging system；High frequency
Inverter is used to provide energy for constant current-constant pressure wireless charging system, and exports the frequency and voltage for meeting system requirements；Just
Grade lateral circuit is used to generate high-frequency current at transmitting coil, and the current value of the high-frequency current and secondary-side circuitry parameter without
It closes；
After secondary side switch circuit receives radio energy, switching secondary-side circuitry topology is controlled by switching, completes constant current
Charge to the switching of constant-voltage charge；
The regulator rectifier circuit is used to fill alternating current that secondary side switch circuit obtains, voltage commutation as battery
DC current, the voltage of electricity.
Fig. 1 show the circuit diagram of constant current of the present invention-constant pressure wireless charging system, in figure, primary-side circuitry
For by compensation inductance LX, compensating electric capacity CpWith the LCL resonance circuits of transmitting coil composition；The inductance of transmitting coil is Lp, internal resistance is
R；
Secondary side switch circuit includes receiving coil, compensating electric capacity Cs1、Cs2, compensation inductance LYWith switch S1、S2、S3；It receives
The inductance of coil is Ls, internal resistance R；Receiving coil, Cs1And LYIt is sequentially connected in series, the both ends of the series circuit are as secondary side switch
The output end of circuit is simultaneously connected with the input terminal of regulator rectifier circuit, the output end of regulator rectifier circuit as constant current-constant pressure without
The output end of micro USB electric system；S1、S3Respectively with Cs1And LYIt is in parallel；S2One end and Cs2It is connected, the other end and LYAnd Cs1Tie point
It is connected, Cs2The other end be connected with the output end of secondary side switch circuit；
Inverter is by the primary-side circuitry formation electric current unrelated with secondary side switch circuit parameter and by emitting electricity
Feel LpIt is coupled to the reception inductance L of secondary side switch circuits；The output frequency of inverter is with output voltage in charging process
It remains unchanged；
Regulator rectifier circuit is the unidirectional full-wave bridge rectifier circuit being made of 4 diodes；
The LX=Lp, Ls=LY, Cs1=Cs2。
The constant current-constant pressure wireless charging system is operated under angular frequency, and system power is provided by inverter, described
Inverter switches the identical angular frequency of front and back holding and voltage U in system topologicalinOutput, in primary-side circuitry, electric energy
First pass through L shown in FIG. 1p,CpAnd LXThe LCL topologys formed, generate unrelated with primary side topological parameter in transmitting coil
Electric current.Wherein, LX=Lp=L1, Cp=C1.Mutual inductance between transmitting coil and receiving coil is M, and energy is passed by transmitting coil
After transporting to receiving coil, through secondary side switch processing of circuit.Secondary side switch circuit is by Cs1、Cs2、Ls、LY、S1、S2、S3Composition,
Wherein Ls=LY=L2, Cs1=Cs2=C2, and by switch S1, S2, S3 control topology.Fig. 2 is charge mode switching flow figure, when
When charging object battery undervoltage, i.e. battery terminal voltage UbatLess than the nominal voltage U of batterybat,n, at this time in secondary side switch circuit
S1, S2 are closed, and S3 is disconnected, and secondary side switch circuit is LCL circuits at this time, it constitutes LCL-LCL type circuits with primary-side circuitry,
For realizing the constant-current charge of battery.Calculate to obtain Imn=MUin/(ωL1C2RRL+ωL1L2), wherein RLBe regulator rectifier circuit and
The equivalent resistance of battery.ImnAfter rectified regulator circuit, the direct current to charge for battery is formd.
It is assumed that the nominal voltage of battery is Ubat,n, battery it is under-voltage when voltage be Ubat, then under normal circumstances, the two
Between Δ U=Ubat,n-UbatVariation it is not too large, at this time it is believed that constant current charging mode under, the state of charging current and battery
It is unrelated, the constant-current charge to battery may be implemented.
During constant-current charge, battery terminal voltage constantly rises, as battery terminal voltage Ubat≥Ubat,nWhen, switch S1, S2
It disconnecting, S3 is closed, and primary side topology is S types (series resonance) topology at this time, it forms LCL-S type circuits with primary-side circuitry,
It is embodied as battery and carries out constant-voltage charge.During constant current charging mode goes to constant-voltage charge, in addition to switch motion, system remaining
Parameter is constant.During the constant-voltage charge of battery, battery terminal voltage UbatWith inverter output voltage UinRelationship be：Realize the constant-voltage charge to battery, wherein UETube voltage drop is switched for rectifier bridge.In electricity
During the constant-voltage charge in pond, charging current is gradually reduced, and the default minimum current threshold value of the present embodiment is Imin, work as constant pressure
Charging current value is less than or equal to threshold value IminWhen stop charging.
The Parameters design of above-mentioned realization constant current-constant pressure wireless charging system, includes the following steps：
Step 1, according to charging object the characteristics of obtains the nominal voltage U of batterybat,n, and design the charging electricity of battery
Flow Ibat；
Step 2, according to the concrete application occasion of wireless charging system, measurement obtains the inductance of transmitting coil, i.e. Lp=L1,
Enable primary side compensation inductance LX=L1.Likewise, measuring primary side receiving coil inductance, Ls=L2, and enable primary side compensation electricity
Feel LY=L2.At this point, mutual inductance M between transmitting coil and receiving coil it is known that and measure transmitting internal resistance R approximate with receiving coil,
Compensating electric capacity is enabled to meet Cp=C1, Cs1=Cs2=C2；
Step 3, according to known parameters Ubat,n, Ibat, L1, L2, the input voltage U of M computing systemsin.Known rectifying and voltage-stabilizing electricity
Lu Zhong, there are pressure drop U for each diodeE, according to voltage U before rectificationmnWith UbatRelationship：Meter
Calculation system input voltage
Step 4, under constant current charging mode, the electric current I of rectifier bridge input terminalmnWith system output current IbatMeetIn order to ensure the front and back power supply U of charge mode transformationinIt is constant with resonance angular frequency ω, the resonant angle of system
Frequency is：
Wherein Req,bat=Ubat,n/Ibat。
Step 5, because compensating electric capacity meetsTherefore the big of compensating electric capacity can be obtained according to ω
It is small.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (1)
1. a kind of charging method of constant current-constant pressure wireless charging system, it is characterised in that including step：
(1) constant current-constant pressure wireless charging system is built, including：Inverter, primary-side circuitry, secondary side switch circuit, rectification
Regulator circuit；
Primary-side circuitry is by compensation inductance LX, compensating electric capacity CpWith the LCL resonance circuits of transmitting coil composition；Transmitting coil
Inductance is Lp, internal resistance R；
Secondary side switch circuit includes receiving coil, compensating electric capacity Cs1、Cs2, compensation inductance LYWith switch S1、S2、S3；Receiving coil
Inductance be Ls, internal resistance R；Receiving coil, Cs1And LYIt is sequentially connected in series, the both ends of the series circuit are as secondary side switch circuit
Output end and be connected with the input terminal of regulator rectifier circuit, the output end of regulator rectifier circuit is as constant current-constant pressure wireless charging
The output end of electric system；S1、S3Respectively with Cs1And LYIt is in parallel；S2One end and Cs2It is connected, the other end and LYAnd Cs1Tie point phase
Even, Cs2The other end be connected with the output end of secondary side switch circuit；
Inverter forms the electric current unrelated with secondary side switch circuit parameter by primary-side circuitry and passes through emission inductance LpCoupling
It is bonded to the reception inductance L of secondary side switch circuits；The output frequency of inverter is kept not with output voltage in charging process
Become；
The LX=Lp, Ls=LY, Cs1=Cs2；
(2) parameter setting is carried out to the constant current-constant pressure wireless charging system built in step (1)：According to battery to be charged
Nominal voltage Ubat,nDefault constant-current charge electric current Ibat, L is determined according to the transmitting that uses, receiving coil typep、Ls, R and hair
It penetrates, the mutual inductance M between receiving coil；
If Cp=C1, Cs1=Cs2=C2, LX=Lp=L1, Ls=LY=L2；The output voltage of inverter is calculated according to known parameters
UinWith resonance angular frequency：
Req,bat=Ubat,n/Ibat (3)
In formula, UEFor pressure drop caused by diode in regulator rectifier circuit；
C is calculated according to resonance angular frequency ω1、C2Value be：
(3) the virtual voltage U of battery to be charged is detectedbat, judge whether to meet Ubat< Ubat,n；If judging result is to meet,
Then closure switch S1、S2, disconnect S3, treat rechargeable battery and carry out constant-current charge until Ubat≥Ubat,n；If judging result is discontented
Sufficient Ubat< Ubat,n, then abandon charging；
(4) when the virtual voltage of battery to be charged meets U under constant-current chargebat≥Ubat,nWhen, disconnect switch S1、S2, and be closed
S3, treat rechargeable battery and carry out constant-voltage charge until constant-voltage charge current value is less than or equal to preset threshold value Imin。
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| CN106374578B (en) * | 2016-10-28 | 2019-02-22 | 北京航空航天大学 | Wireless charging system and its power transmission control method |
| CN106374579B (en) * | 2016-10-28 | 2019-02-22 | 北京航空航天大学 | Wireless charging system and its power transmission control method |
| CN106532845B (en) * | 2016-12-08 | 2019-03-01 | 东南大学 | A kind of battery wireless charging system of pair side combined type compensation network |
| CN106786886B (en) * | 2016-12-22 | 2019-12-06 | 东南大学 | wireless charging system charging method based on load identification technology |
| WO2018157371A1 (en) * | 2017-03-03 | 2018-09-07 | 小天才科技有限公司 | Non-contact charging device |
| CN106849374B (en) * | 2017-04-05 | 2019-05-31 | 西南交通大学 | A kind of induction type wireless charging system becoming secondary structure |
| CN107069983B (en) * | 2017-04-05 | 2020-02-18 | 西南交通大学 | Secondary variable parameter and variable structure induction type wireless charging system |
| RU2727724C1 (en) * | 2017-04-07 | 2020-07-23 | Гуандун Оппо Мобайл Телекоммьюникейшнз Корп., Лтд. | Wireless charging device and method, and device to be charged |
| CN106972582B (en) * | 2017-04-28 | 2024-03-29 | 中惠创智(阜阳)技术有限公司 | High-power wireless charging system and control method thereof |
| CN107947306B (en) * | 2017-12-05 | 2020-03-27 | 广东小天才科技有限公司 | Wireless quick charging system and method |
| CN108199494B (en) * | 2017-12-29 | 2020-11-03 | 武汉大学 | Gain-adjustable active load wireless charging device and adjusting method thereof |
| CN109831013A (en) * | 2019-01-11 | 2019-05-31 | 江苏大学 | A kind of constant current-constant pressure pair side automatic switch-over circuit and resonance type wireless electric energy transmission system |
| US20220368160A1 (en) * | 2019-09-26 | 2022-11-17 | The University Of Hong Kong | A wireless battery charging system and method for battery charging and handshaking |
| CN112421792B (en) * | 2020-10-16 | 2022-12-27 | 江南大学 | Wireless charging system and control method for constant-current/constant-voltage charging optimization |
| CN112260416B (en) * | 2020-10-29 | 2022-08-02 | 中国科学院电工研究所 | Constant-current constant-voltage induction type wireless charging system based on variable primary parameters |
| CN113147435A (en) * | 2021-03-04 | 2021-07-23 | 广西电网有限责任公司电力科学研究院 | Wireless charging system and control method |
| CN113162136B (en) * | 2021-03-04 | 2022-12-16 | 广西电网有限责任公司电力科学研究院 | Wireless charging system and method |
| CN113922459A (en) * | 2021-10-22 | 2022-01-11 | 北京小米移动软件有限公司 | Charging protection method and device, electronic equipment and storage medium |
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| GB2111222B (en) * | 1981-10-02 | 1986-01-15 | Bonar Instr Limited | Series-resonant test-voltage source |
| CN101232110B (en) * | 2007-01-25 | 2010-05-26 | 华为技术有限公司 | Method and apparatus for charging batteries |
| JP2014143814A (en) * | 2013-01-23 | 2014-08-07 | Technova:Kk | Non-contact charging device and charging method |
| CN104753152B (en) * | 2015-04-10 | 2017-03-08 | 东南大学 | The induction type charging system of constant current constant voltage Compound Topology |
| CN105429313B (en) * | 2015-12-11 | 2018-01-30 | 中国矿业大学 | A kind of control method of the changeable radio energy transmission system of resonance compensation topology |
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