CN104937810B - Efficiency and the wireless power reception device of power transmission can be improved by modulating the pay(useful) load resistance of receiving terminal - Google Patents
Efficiency and the wireless power reception device of power transmission can be improved by modulating the pay(useful) load resistance of receiving terminal Download PDFInfo
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- CN104937810B CN104937810B CN201280078160.7A CN201280078160A CN104937810B CN 104937810 B CN104937810 B CN 104937810B CN 201280078160 A CN201280078160 A CN 201280078160A CN 104937810 B CN104937810 B CN 104937810B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 34
- 230000008859 change Effects 0.000 claims abstract description 14
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- 230000033228 biological regulation Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000011017 operating method Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
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- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
-
- 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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
-
- 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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
-
- 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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
-
- H04B5/24—
-
- H04B5/79—
Abstract
The present invention relates to can improve wireless power reception device and the wireless power transmission system using described device that power transmits by modulating the pay(useful) load resistance of receiving terminal.The receiving unit of wireless power reception device is from wireless power conveyer receiving power.Rectification circuit unit carries out rectification to the electric current exported from receiving unit, and exports the electric current of institute's rectification.Load resistance modulating unit receives the control signal with dutycycle, and the electric current provided according to the control signal control received from rectification circuit unit increases the size of equivalent resistance to improve efficiency to change the size of pay(useful) load resistance.
Description
Technical field
The present invention relates to a kind of wireless power transmission system, and a kind of more particularly to pay(useful) load by modulating receiving terminal
Resistance come improve power transmission wireless power reception device.
Background technology
Wireless power transmission system generally include conveyer D/C power, conveyer resonance inverter, transmission resonator,
Receive resonator, rectification circuit unit and power inverter.It is efficient in order to be provided under the limitation of lower coupling and small resonator
Rate is, it is necessary to correspondingly optimize the load resistance of reception device.
In addition to efficiency, it is also desirable to transmit the ability of the higher power than power needed for reception device.Especially, when
When long range between conveyer and reception device be present, it is difficult to which enough power is provided to reception device.In addition to distance,
Load resistance also contributes to power transmission.Then, in order to transmit desired power, it is necessary to suitably to reception device with high efficiency
Select load resistance.
Problem is to be difficult to freely change load resistance.Load resistance is needed by the power of the device of actual power consumption
Ask decision, and not the design variable of system.When using impedance inverter circuit, it can convert from reception resonator observation
Pay(useful) load resistance, and improve performance.
However, typical impedance inverter circuit has fixed conversion ratio, it is impossible to freely changes impedance transformation ratio.
In this case, such limitation be present, i.e. under conditions of specific distance or specific load current,
Performance can be optimized, but when distance changes or load current changes, hydraulic performance decline, and system becomes unstable.
The power conversion circuit at typical reception device rear portion, which only has, is receiving the higher power time limit of the power than needed for
The function of power processed.Thus, when the power of reception is less than required power, however, it is difficult to fully provided to loading resistor
Desired power.
In the U.S. Patent application US2010/0277003A1 of entitled " adaptive impedance-tumed in wireless power transmission "
In, it is to control power, rather than increase efficiency to change the purpose of reception device resistance by using DC-DC inverters.Should
Patent application claimed different control methods and input/output power sensing side in order to increase or decrease power output
Method.However, its object is to power transmission control rather than increase efficiency.The patent application describes when by using these sides
It need not increase efficiency when method is to increase the power of transmission.
On the contrary, present patent application aims at the efficiency that resonator is improved under the auxiliary of circuit for power conversion, without
It is control power.Even if the reception device proposed receives identical power at same distance, because reception device is anti-at its
Radio resistance is run in the state of being exaggerated, so reception device also has high efficiency.With being added without proposed load resistance
Modulating unit is compared, and the addition of the load resistance modulating unit proposed provides higher efficiency.
The content of the invention
Technical problem
It is an object of the invention to provide a kind of power transmission is improved by modulating the pay(useful) load resistance of receiving terminal
Wireless power transmission system, the wireless power transmission system can solve to limit as follows：In specific distance or specific load electricity
In the case of stream, performance can be optimized, but when distance changes or load current changes, be because typical wireless power transmits
The typical impedance inverter circuit used in system can not freely change impedance transformation ratio, and have fixed conversion ratio, institute
With hydraulic performance decline, and system becomes unstable.
Technical scheme
In order to achieve the above object, the present invention provides a kind of wireless power reception device, the wireless power reception device bag
Include：Receiving unit, it is from power transmission device receiving power；Rectification circuit unit, it is to the electricity that is exported from the receiving unit
Stream carries out rectification, and exports the electric current of institute's rectification；And load resistance modulating unit, it receives the control with dutycycle and believed
Number, the electric current from rectification circuit unit offer is adjusted according to the control signal received to change pay(useful) load resistance
Size, and increase the size of reflected resistance to improve efficiency.
Beneficial effect
According to the present invention, following advantage be present：Can be by the way that loading Q value of the pay(useful) load resistance to reception device be increased
Direction change, and the reflected resistance of conveyer is reflexed to increase the efficiency of whole system and output work by increase
Rate.
Further, since can exist over long distances between wireless power conveyer and wireless power reception device, and by
This power output increases reflected resistance when being reduced to less than or equal to the power required for loading resistor, therefore presence can be tieed up
The advantages of holding the identical efficiency and power output in the case of relatively long distance.
Brief description of the drawings
Fig. 1 (a) and 1 (b) show the correlation received between resonator and reflected resistance device of series connection.
Fig. 2 (a) and 2 (b) show the correlation received between resonator and reflected resistance device of parallel connection.
Fig. 3 is the block diagram of wireless power transmission system according to an embodiment of the invention.
Fig. 4 is the example of the rectification circuit figure in Fig. 3.
Fig. 5 shows the first modulation circuit (boosting (boost) of the first embodiment of the load resistance modulating unit of the present invention
Type modulation circuit).
Fig. 6 shows the second modulation circuit (booster type modulation of the second embodiment of the load resistance modulating unit of the present invention
Circuit).
Fig. 7 shows the 3rd modulation circuit (the SEPIC types modulation of the 3rd embodiment of the load resistance modulating unit of the present invention
Circuit).
Fig. 8 shows the 4th modulation circuit (decompression (buck) of the fourth embodiment of the load resistance modulating unit of the present invention
Type modulation circuit).
Fig. 9 shows that the 5th modulation circuit of the 5th embodiment of the load resistance modulating unit of the present invention (receives pulsation DC
The flyback modulation circuit (flyback modulation circuit) of control source).
Figure 10 show the present invention load resistance modulating unit sixth embodiment the 6th modulation circuit (buck-boost-
(cascade) type of cascade modulation circuit).
Figure 11 (a) and 11 (b) are when the receiving unit of the present invention includes series resonant structure and parallel resonance structure
Showing for the conversion of serial or parallel connection is equally performed to receiving unit via modulation load resistance in order to increase reflected resistance
Example.
Figure 12 is the flow chart of the operating method of the wireless power reception device in Fig. 3.
Figure 13 is the flow chart of the operating method of the wireless power transmission system in Fig. 3.
Figure 14 (a) is the present invention and delivering power connects relative to wireless power conveyer with wireless power in the prior art
The curve map of the distance between receiving apparatus, and Figure 14 (b) is relative to biography according to the delivering power of the present invention and prior art
Send the curve map of the distance between device and reception device.(" load modulation " represents the present invention and " only rectifier " represents now
There is technology.)
Figure 15 (a) is the curve relative to distance according to the efficiency when output is 21.6W of the present invention and prior art
Figure, and Figure 15 (b) is relative to the curve map of distance in the present invention with the efficiency when output is 10.9W in the prior art.
(" load of modulation " represents the present invention and " only rectifier " represents prior art.)
Embodiment
Hereinafter, the exemplary embodiment of the present invention is described in detail with reference to the attached drawings.When illustrating of the invention, in order to unnecessary
Ground obscures subject of the present invention, will omit the detailed description related to known function or structure.
Because the present invention can make different variations and have some embodiments, therefore will be shown in figure specific
Embodiment, and will be explained in specific embodiment in the present invention or application.But, it is no intended to limit the present invention to
Specific embodiment, and it will be understood that the present invention covering fall within the spirit and scope of the present invention all variations, etc.
Jljl, and/or substitute.
When mentioning any element with another element " connection " or " access ", it should be appreciated that the former with the latter can be directly connected to
Or access, or another element may be present therebetween.In turn, when any element is referred to as ' directly connecting with another element
Connect ' or when ' being directly accessed ', it should be appreciated that can there is no other elements between the two.Such as " between being located at ... ", " direct position
In ... between " or " with ... it is adjacent " and " with ... direct neighbor " etc the relation for being used to illustrate interelement other
Statement should also be as explaining in an identical manner.
The term used in the present invention is merely to illustrate specific embodiment, it is no intended to the limitation present invention.Unless otherwise
Illustrate, otherwise, the term of singulative includes plural form.It should be understood that in the present invention, term " comprising " or " having " show spy
Sign, numeral, step, operation, element, part or its presence combined, still, it is not excluded that one or more other features,
Numeral, step, operation, element, part or its presence or addition for combining.
Hereinafter, the present invention is described in more detail by referring to accompanying drawing.
Before explaining the present invention, it can represent equivalent in wireless power conveyer by following equation 1
The size of resistance：
[equation 1]
Rreflected=k2ω0L1QRX。
In this example, k represents the coupling received between resonator in transmission coil and the reception device in conveyer
Syzygy number, L1Represent the inductance of transmission coil, QRXRepresent the loading Q values (loaded-Q) for receiving resonator, ω0It is resonator
Resonant frequency and inverter switching frequency, the influence of the coupling between transmission coil and reception device is by single equivalent resistance
RreflectedRepresent.
Because the influence of reception device is reflected to transmission coil, by equivalent resistance RreflectedReferred to as reflected resistance.
As shown in Fig. 1 (a) to 2 (b), reflected resistance RreflectedWith transmitting coil L1Parasitic resistor RTX parasiticString
Connection connection.Thus, the condition of high efficiency and height output is increase reflected resistance Rreflected。
Reflected resistance depends on the Q determined by the load resistance of reception resonatorRX(square formula 1).
In the case of series resonance reception device, Q values and reflected resistance are loaded with load resistance RLReduce and increase (see
Fig. 1), and in the case of parallel resonance reception device, Q values and reflected resistance R are loadedreflectedWith load resistance RLIncrease
Add and increase (see Fig. 2).
Thus, the present invention changes the reflection electricity of pay(useful) load resistance and reception resonator via load resistance modulation circuit
The size of resistance, to increase the efficiency of delivering power and delivering power.
Fig. 3 is the block diagram of wireless power transmission system according to an embodiment of the invention.Fig. 4 is the rectifier in Fig. 3
The example of circuit diagram.
As shown in figure 3, the wireless power transmission system 300 of the present invention is including wireless power conveyer 100 and wirelessly
Power reception device 200.
The delivering power of wireless power conveyer 100.Wireless power conveyer 100 includes D/C power and transmission resonance
Unit, and play via the inductor L in transmission resonant element1The work of outside will be sent to from power caused by D/C power
With.
In order to improve the transmission efficiency of wireless power, wireless power reception device 200 adjusts the size of reflected resistance.
More specifically, wireless power reception device 200 includes receiving unit 120, rectification circuit unit 130 and load
Resistance modulating unit 140.
Receiving unit 120 is from wireless power conveyer receiving power.
Rectification circuit unit 130 carries out rectification to the electric current exported from receiving unit 120, and exports the electric current of institute's rectification.
Load resistance modulating unit 140, which receives, includes the control signal of dutycycle, according to the control signal CNT received come
The electric current from the offer of rectification circuit unit 130 is adjusted to change the size of pay(useful) load resistance, and is adjusted in power transmission device
Reflected resistance size, to improve efficiency.
The operation of control signal CNT control load resistances modulating unit 140, specifically, control signal CNT are that have to fix
Or the pulse signal of variable dutycycle, its regularly switching device in ON/OFF load resistance modulating unit 140.
Receiving unit 120 can be configured to following structure：Inductor L and capacitor C in series, parallel connection are connected and in parallel
Connection.More specific description is provided with reference to following Figure 10.
Next, reference picture 4, rectification circuit unit 130 include the first rectification unit 131, the second rectification unit 132 and
Rectification circuit unit output filter 133.Rectification circuit unit 130 receives the electric current of institute rectification from receiving unit 120, and by institute
The electric current of reception provides and arrives load resistance modulating unit 140.
First rectification unit 131 includes two diode D being connected in series via first node N1, the second rectification unit
132 two diode D including being connected in series via section point N2, and the first rectification unit 131 and the second rectification unit
132 are connected in parallel.In addition, rectification circuit unit 130 is connected in parallel with rectification circuit unit output filter C.
From receiving unit 120 provide alternating current via the rectifying device (diode) of the first rectification unit 131 and
DC current is outputted as in the output filter C of rectification circuit unit 130.
Load resistance modulating unit 140 plays regulation from the electric current of the offer of rectification circuit unit 130 to change load resistance
RLSize effect.More specifically, the electric current that its regulation provides from rectification circuit unit 130 is effectively negative to increase or to reduce
Carry the size of resistance.
Fig. 5 shows the first modulation circuit (booster type modulation of the first embodiment of the load resistance modulating unit of the present invention
Circuit).
More specifically, as shown in figure 5, inductor L of the load resistance modulating unit 140 in receiving unit 120 and electricity
Container C attachment structure and it is different, in the case where being connected in series structure, load resistance modulating unit 140 include first
Modulation circuit 210, the second modulation circuit 220 or the 3rd modulation circuit 230, and in the case of parallel connection structure, load
Resistance modulating unit 140 includes the 4th modulation circuit 240, the 5th modulation circuit 250 or the 6th modulation circuit 260.
First modulation circuit 210 can be include inductor 211, first switch device 212, second switch device 213, with
And the booster type circuit of capacitor 214.
More specifically, one end of inductor 211 is connected to rectification unit, and its other end is connected to the 3rd node N3.
The drain terminal of first switch device 212 is connected to the 3rd node N3, and its source terminal is connected to fourth node N4.Second
One end of switching device 213 is connected to the 3rd node N3, and its other end is connected to the 5th node N5.
Control signal CNT is pulse signal, and it is provided to the gate terminal of first switch device 212.Control signal CNT
Dutycycle can have fixed value or be changed according to the output voltage of loading resistor.
First switch device 212 replaces connection with second switch device 213.
When first switch device 212 is connected, the electric current flowed in inductor 211 gradually adds up.Flowed in inductor
Electric current gradually adds up via first switch device 212 and rectification circuit unit 130.
When first switch device 212 turns off, the increase of the 3rd node N3 voltage, once and voltage be equal to or higher than the
The threshold voltage of two switching devices 213, then second switch device 213 connect.Thus, the electric current flowed in inductor 211 is carried
It is supplied to loading resistor RL。
As the ratio (such as dutycycle) that first switch device 212 is switched on during whole switch periods increases, by
Gradually cumulative electric current increase, being input to the resistance of modulator 210 reduces, and because is input to the electricity of the first modulation circuit 210
Resistance is pay(useful) load resistance, so reflected resistance increases.
Thus, the first modulation circuit 210 adjusts electric current according to control signal CNT (pulse signal) dutycycle so that
Compared with typical load resistance, input resistance reduces, to increase the reflected resistance in wireless power conveyer 100.Therefore,
Wireless power transmission efficiency and delivering power increase.
Fig. 6 shows the second modulation circuit (booster type modulation of the second embodiment of the load resistance modulating unit of the present invention
Circuit).
As shown in fig. 6, the second modulating unit 220 is the circuit for the example for representing the booster type circuit for receiving Pulsating DC currents
Figure.
More specifically, the second modulation circuit 220 includes first switch device 221, second switch device 222 and electric capacity
Device 223.
The drain terminal of first switch device 221 is connected to the 3rd node N3, and its gate terminal is connected to control unit
170, its source terminal is connected to fourth node N4.
One end of second switch device 222 is connected to the 3rd node N3, and its other end is connected to the 5th node N5.Electricity
Container 223 is connected in parallel with second switch device 222.
Second modulation circuit 222 is the rectification circuit unit output filter C and by removing power receiving circuit
Circuit obtained from the inductor of load resistance modulating unit in one modulation circuit 210.
Thus, when first switch device 221 is connected, the amplitude of the resonance current at receiving unit slowly increases.
In this case, when the connection part (for example, turn-on time part) of first switch device 221 is longer, in receiving unit 120
In there is electric current and gradually add up.Thus, the pay(useful) load resistance at receiving unit 120 reduces, and reflected resistance increase.
Fig. 7 shows the 3rd modulation circuit (the SEPIC types modulation of the 3rd embodiment of the load resistance modulating unit of the present invention
Circuit).
As shown in fig. 7, the 3rd modulation circuit 230 is the example for representing the SEPIC type translation circuits for receiving Pulsating DC currents
Circuit, more specifically, the 3rd modulation circuit 230 include first switch device 231, second switch device 234, the first capacitor
232nd, the second capacitor 235 and inductor 233.
The drain terminal of first switch device is connected to the 3rd node N3, and its gate terminal is connected to control unit, and
Its source terminal is connected to fourth node N4.
One end of first capacitor 232 is connected to the 3rd node N3, and its other end is connected to the 5th node N5.Inductor
233 one end is connected to the 5th node N5, and its other end is connected to the 6th node N6.Second switch device 234 is diode, its
One end is connected to the 6th node N6, and its other end is connected to the 7th node N7.One end of second capacitor 235 is connected to
Seven node N7, and its other end is connected to the 8th node N8.
In this example, when first switch device 231 receives control signal CNT and is activated, there is provided to the 3rd node
The increase of the electric current of N3 and receiving unit 120.In this case, there is the inductor for being connected to the 6th node N6 electric current gradually to tire out
The state added, and thus provide electric current I to the 5th node N5LS。
Then, when first switch device 231 turns off, there is provided to the 5th node N5 and electric current ICS+ISLConsistent electricity
Pressure rises more than the threshold voltage of second switch device 234.Then, second switch device 234 is connected, therefore it provides to
Five node N5 electric current increase.
Thus, by adjusting pay(useful) load resistance at load resistance modulating unit 140, the load at receiving unit 120
Resistance RLBig I increase or reduce.According to this principle, it can reduce or increase reflected resistance.
Fig. 8 shows the 4th modulation circuit (the voltage-dropping type modulation of the fourth embodiment of the load resistance modulating unit of the present invention
Circuit).
As shown in figure 8, the 4th modulating unit 240 is the example for representing the voltage-dropping type change-over circuit for being used to increase input resistance
Circuit diagram.
More specifically, the 4th modulating unit include first switch device 241, second switch device 242, inductor 243, with
And capacitor 244.
The drain terminal of first switch device 241 is connected to rectification circuit unit 130, and it is single that its gate terminal is connected to control
Member 170, and its drain terminal is connected to the 3rd node N3.Second switch device 242 can be diode, and its one end is connected to
3rd node N3, and its other end is connected to fourth node N4.One end of inductor 243 is connected to the 3rd node N3, and
Its other end is connected to the 5th node N5.One end of capacitor 244 is connected to the 3rd node N3, and its other end is connected to
Six node N6, so as to which capacitor is connected in parallel with inductor.
When first switch device 241 receives control signal (pulse signal) and connects, pay(useful) load resistance is fixed.Such as
Fruit first switch device 241 turns off, then and electric current reduces, the increase of pay(useful) load resistance, and thus in wireless power conveyer
With larger reflected resistance.
High reflected resistance increases efficiency and power, and thereby increases the power for being sent to wireless power reception device
And power delivery efficiency.
Fig. 9 shows that the 5th modulation circuit of the 5th embodiment of the load resistance modulating unit of the present invention (receives pulsation DC
The flyback modulation circuit of control source).
As shown in figure 9, the 5th modulation circuit 250 is the example for representing the flyback modulation circuit for receiving pulsating DC voltage input
Circuit diagram.
More specifically, the 5th modulation circuit 250 includes kickback transformer 253, first switch device 254, second switch device
Part 255 and capacitor 256, wherein, in kickback transformer 253, the coil in the first inductor 251 and the second inductor 252
Wind in opposite directions.
For reference, kickback transformer 253 is formed as follows, i.e. coil and the second electricity in the first inductor 251
Coil in sensor 252 is wound in the opposite direction, and provides electric current using corresponding counter electromotive force.
One end of first inductor 251 is connected to the 3rd node N3, and its other end is connected to first switch device 254
Source terminal.The source terminal of first switch device 254 is connected to the other end of the first inductor 251, and control signal is carried
The gate terminal of first switch device is supplied to, and the drain terminal of first switch device is connected to fourth node N4.
One end of second inductor 252 is connected to one end of diode, and its other end is connected to the one of capacitor 256
End.Capacitor 256 is connected with diodes in parallel.
When the cutoff of first switch device 254 is with control signal (the pulse letter provided to the 5th modulation circuit 250
Number) shut-off ratio increase and it is elongated when, provide the current reduction to the second inductor 252 from the first inductor 251, and
The resonance potential increase of receiving unit 120.Thus, pay(useful) load resistance increases.
Thus, receiving unit 120 causes the reflected resistance in wireless power conveyer to uprise.High reflected resistance increase
Power delivery efficiency and power, and thus it is sent to power and the power delivery efficiency increasing of wireless power reception device
Add.
Figure 10 show the present invention load resistance modulating unit sixth embodiment the 6th modulation circuit (buck-boost-
Cascade connection type modulation circuit).
6th modulation circuit 260 is the example for representing the buck-boost-cascade circuit for receiving pulsating DC voltage input
Circuit diagram.
More specifically, the 6th modulation circuit 260 includes first switch device 261, second switch device 262, inductor
263rd, the 3rd switching device 264, the 4th switching device 265 and capacitor C.
The source terminal of first switch device 261 is connected to rectification circuit unit 130, and control signal is provided to first and opened
The gate terminal of device is closed, and the drain terminal of first switch device is connected to the 3rd node N3.
One end of inductor 263 is connected to the 3rd node N3, and its other end is connected to the 5th node N5.Second switch
One end of device 262 is connected to the 3rd node N3, and its other end is connected to fourth node N4.The source electrode of 3rd switching device
Terminal is connected to the 5th node N5, and its gate terminal is connected to control unit 170, and its drain terminal is connected to the 6th node
N6.One end of capacitor 267 is connected to the 7th node N7, and its other end is connected to the 8th node N8.
In this example, first and the 3rd switching device 261 and 264 receive control signal CNT simultaneously (identical pulse believed
Number) operated with performing ON/OFF.
Thus, when first and the 3rd connection of switching device 261 and 264, the electric current on inductor gradually adds up.When gradual
In short-term, the resonance potential for receiving unit 120 continually occur gradually adds up accumulation interval (for example, turn-on time part).
Thus, the pay(useful) load resistance increase at receiving unit 120, and the reflected resistance in conveyer correspondingly increases
Greatly.Therefore, it is possible to increase the power exported from wireless power conveyer 100 and power delivery efficiency.
Figure 11 (a) and Figure 11 (b) is when the receiving unit of the present invention includes series resonant structure and parallel resonance structure
Serial or parallel connection conversion is equally performed to reception device to increase the example of reflected resistance via modulation load resistance.
Reference picture 11 (a), power reception device are included by C2AWith C2BBoth the series connection of composition and parallel resonance structure.
IfThen C2BInfluence be ignored, and circuit becomes series resonance.In this case,
When load resistance modulating unit control electric current is to reduce pay(useful) load resistance, by increasing capacitance it is possible to increase loading Q values and reflected resistance.
IfThe conversion of series resonant structure is then gone to, and load resistance changes over inverse, makes
Must perform scaling (for example,).Thus, with load resistance RLIncrease, the load resistance changed reduce, and
Load the increase of Q values.Therefore, when load resistance modulating unit control electric current is to increase pay(useful) load resistance, by increasing capacitance it is possible to increase reflection
Resistance.
Reference picture 11 (b), power reception device also include by C2AAnd C2BThe series connection formed and parallel resonance structure this two
Person.
IfThen C2BInfluence be ignored, and circuit becomes series resonance.In this case,
When load resistance modulating unit control electric current is to increase pay(useful) load resistance, by increasing capacitance it is possible to increase loading Q values and reflected resistance.
IfThen receiving unit is converted into parallel resonance structure, and load resistance changes over inverse,
So as to perform scaling.(for example,)。
Thus, with the reduction of load resistance, the load resistance increase changed, and load the increase of Q values.Thus, when
When load resistance modulating unit control electric current is to reduce pay(useful) load resistance, reflected resistance can be increased.
Figure 12 is the flow chart of the operating method of the wireless power reception device in Fig. 3.
As shown in figure 12, the operating method S10 of wireless power reception device include receiving step S11, rectifying step S12,
And load resistance changes step S13.
Receiving step S11 be receiving unit from wireless power 100 receiving power of conveyer the step of.
Rectifying step S12 is rectification circuit unit to the step by using electric current progress rectification caused by the power received
Suddenly.
Load resistance changes step S13 and is the steps of：Load resistance modulating unit 140 receives the control with dutycycle
Signal, electric current is adjusted to change the size of pay(useful) load resistance according to control signal CNT, and adjusts the size of reflected resistance,
To improve efficiency.
Dutycycle can be fixed or variable dutycycle, and rectifying step S12 can include generation Pulsating DC currents
The step of.
Figure 13 is the flow chart of the operating method of the wireless power transmission system in Fig. 3.
As shown in figure 13, the operating method S100 of wireless power transmission system includes transfer step S110, receiving step
S120, rectifying step S130 and load resistance change step S140.
The step of transfer step S11 is wireless power 100 delivering power of conveyer.
Receiving step S120 is the step of wireless power reception device 200 receives transmitted power.
Rectifying step S130 is that wireless power reception device 200 is carried out to the electric current generated by using the power received
The step of rectification.
Load resistance changes step S140 and is the steps of：Wireless power reception device 200 receives the control with dutycycle
Signal CNT processed, electric current is adjusted according to control signal CNT to change the size of pay(useful) load resistance, and correspondingly regulation reflection
The size of resistance is to improve power transfer efficiency.
Figure 14 (a) be it is of the invention with delivering power of the prior art relative between conveyer and reception device away from
From curve map, and Figure 14 (b) be it is of the invention with delivering power of the prior art relative to conveyer and reception device
The distance between curve map.
As shown in Figure 14 (a) and Figure 14 (b), it can be seen that in the prior art, distance longer, delivering power and system
Efficiency it is lower.On the contrary, as can be seen that via load resistance modulating unit, the present invention have with apart from unrelated and constant
Delivering power and efficiency.
Figure 15 (a) is the curve map of the invention with the efficiency of the prior art when exporting 21.6W relative to distance, and
And Figure 15 (b) is the curve map of the invention with the efficiency of the prior art when exporting 10.9W relative to distance.
So, the present invention can receive the output voltage as feedback of reception device to adjust the size of reflected resistance
(value).In addition, even if when exist it is long apart from when, constant power can be also provided.On the contrary, when in the presence of long range and power
When power output before converter is reduced to less than or equal to the power that loading resistor is actually needed, prior art can not
Power is provided.
However, because the present invention can increase reflected resistance, therefore in the case of relatively long distance, when exist it is long away from
From and power inverter before power output be reduced to less than or equal to the power that loading resistor is actually needed when, can also
The power output for maintaining conveyer to need.
Although illustrating the present invention using specific embodiment and figure, the invention is not restricted to this, and in the skill of the present invention
In the equivalency range of the spiritual and following claims of art, those skilled in the art in the invention can make modification and
Change.
Description of reference numerals
100：Wireless power conveyer
120：Receiving unit
130：Rectification circuit unit
140：Load resistance modulating unit
200：Wireless power reception device
210：First modulation circuit
220：Second modulation circuit
230：3rd modulation circuit
240：4th modulation circuit
250：5th modulation circuit
260：6th modulation circuit
300：Wireless power transmission system
Claims (10)
1. a kind of wireless power reception device, it includes：
Receiving unit, it is from power transmission device receiving power；
Rectification circuit unit, it carries out rectification to the electric current exported from the receiving unit, and exports the electric current of institute's rectification；And
Load resistance modulating unit, it receives the control signal with dutycycle, is adjusted according to the control signal received from institute
The electric current of rectification circuit unit offer is stated to change the size of pay(useful) load resistance, and increases the power transmission device
The size of reflected resistance to improve efficiency,
Wherein, the receiving unit includes the inductor and capacitor being connected in series,
Wherein, the electric current that load resistance modulating unit regulation provides from the rectification circuit unit described has to reduce
Imitate the size of load resistance.
2. wireless power reception device according to claim 1, wherein, the dutycycle is fixed or variable duty
Than.
3. wireless power reception device according to claim 1, wherein, the load resistance modulating unit is that booster type is adjusted
Circuit or voltage boosting-reducing type modulation circuit processed.
4. wireless power reception device according to claim 1, wherein, the load resistance modulating unit is SEPIC types
Modulation circuit.
5. wireless power reception device according to claim 1, wherein, the load resistance modulating unit is to be used to modulate
The pay(useful) load resistance is to increase the modulation circuit of the loading Q values of the wireless power reception device.
6. a kind of wireless power reception device, it includes：
Receiving unit, it is from power transmission device receiving power；
Rectification circuit unit, it carries out rectification to the electric current exported from the receiving unit, and exports the electric current of institute's rectification；And
Load resistance modulating unit, it receives the control signal with dutycycle, is adjusted according to the control signal received from institute
The electric current of rectification circuit unit offer is stated to change the size of pay(useful) load resistance, and increases the power transmission device
The size of reflected resistance to improve efficiency,
Wherein, the receiving unit includes the inductor and capacitor being connected in parallel,
Wherein, the electric current that the load resistance modulating unit regulation provides from the rectification circuit unit is described effectively negative to increase
Carry the size of resistance.
7. wireless power reception device according to claim 6, wherein, the load resistance modulating unit is that voltage-dropping type is adjusted
Circuit or buck-boost modulation circuit processed.
8. wireless power reception device according to claim 6, wherein, the load resistance modulating unit be decompression-liter
Pressure-cascade connection type modulation circuit.
9. wireless power reception device according to claim 6, wherein, the dutycycle is fixed or variable duty
Than.
10. wireless power reception device according to claim 6, wherein, the load resistance modulating unit is to be used to adjust
The pay(useful) load resistance is made to increase the modulation circuit of the loading Q values of the wireless power reception device.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2012-0148249 | 2012-12-18 | ||
| KR1020120148249A KR101390954B1 (en) | 2012-12-18 | 2012-12-18 | Wireless power receiving apparatus with automatic load resistance modulation for efficiency and power improvement |
| PCT/KR2012/011077 WO2014098279A1 (en) | 2012-12-18 | 2012-12-18 | Wireless power receiving apparatus capable of improving efficiency and power delivery using modulation of effective load resistance of receiving end |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104937810A CN104937810A (en) | 2015-09-23 |
| CN104937810B true CN104937810B (en) | 2018-03-30 |
Family
ID=50659052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280078160.7A Expired - Fee Related CN104937810B (en) | 2012-12-18 | 2012-12-18 | Efficiency and the wireless power reception device of power transmission can be improved by modulating the pay(useful) load resistance of receiving terminal |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101390954B1 (en) |
| CN (1) | CN104937810B (en) |
| WO (1) | WO2014098279A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102391190B1 (en) * | 2015-03-13 | 2022-04-28 | 삼성전자주식회사 | Method for generating a load of wireless power receiving unit in wireless charge system and the wireless power receiving unit |
| KR101847256B1 (en) * | 2016-01-11 | 2018-05-28 | 한국전자통신연구원 | Wireless power receiver, system having the same and method for controlling automatically load resistance transformation ratio |
| DE102016210018A1 (en) * | 2016-06-07 | 2017-12-07 | Robert Bosch Gmbh | Transmission system for contactless transmission of energy |
| KR102622053B1 (en) | 2016-07-18 | 2024-01-08 | 삼성전자주식회사 | Electronic Apparatus, Display Apparatus, and Driving Method Thereof |
| KR102154240B1 (en) | 2017-07-06 | 2020-09-09 | 한국전자통신연구원 | An wireless power transmission system including receiving coil having predetermined pitch |
| KR102154223B1 (en) * | 2017-07-27 | 2020-09-09 | 한국전자통신연구원 | Wireless power receiving device capable of controlling effective load resistance and effective load resistance control method |
| US10693326B2 (en) | 2017-07-27 | 2020-06-23 | Electronics And Telecommunications Research Institute | Wireless power receiving apparatus controlling effective load resistance, and effective load resistance control method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102725939A (en) * | 2009-09-22 | 2012-10-10 | 波尔基斯公司 | Inductive power supply |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3146631B2 (en) * | 1992-06-05 | 2001-03-19 | 株式会社村田製作所 | Telephone line power utilization circuit |
| KR100943437B1 (en) * | 2007-11-06 | 2010-02-19 | 한국전기연구원 | Apparatus and method for contactless power supply for medium voltage power line |
| CN101965671B (en) * | 2008-01-07 | 2014-12-03 | 捷通国际有限公司 | Inductive power supply with duty cycle control |
| US8338991B2 (en) * | 2009-03-20 | 2012-12-25 | Qualcomm Incorporated | Adaptive impedance tuning in wireless power transmission |
| US9362820B2 (en) * | 2010-10-07 | 2016-06-07 | Semiconductor Energy Laboratory Co., Ltd. | DCDC converter, semiconductor device, and power generation device |
-
2012
- 2012-12-18 KR KR1020120148249A patent/KR101390954B1/en active IP Right Grant
- 2012-12-18 CN CN201280078160.7A patent/CN104937810B/en not_active Expired - Fee Related
- 2012-12-18 WO PCT/KR2012/011077 patent/WO2014098279A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102725939A (en) * | 2009-09-22 | 2012-10-10 | 波尔基斯公司 | Inductive power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104937810A (en) | 2015-09-23 |
| WO2014098279A1 (en) | 2014-06-26 |
| KR101390954B1 (en) | 2014-04-29 |
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