CN104937810A - Wireless power receiving apparatus capable of improving efficiency and power delivery using modulation of effective load resistance of receiving end - Google Patents
Wireless power receiving apparatus capable of improving efficiency and power delivery using modulation of effective load resistance of receiving end Download PDFInfo
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- CN104937810A CN104937810A CN201280078160.7A CN201280078160A CN104937810A CN 104937810 A CN104937810 A CN 104937810A CN 201280078160 A CN201280078160 A CN 201280078160A CN 104937810 A CN104937810 A CN 104937810A
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- 230000008859 change Effects 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 11
- 238000012546 transfer Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000004447 accommodation reflex Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
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- 238000009825 accumulation Methods 0.000 description 1
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Classifications
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- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Dc-Dc Converters (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Disclosed are a wireless power receiving apparatus capable of improving power delivery using a modulation of an effective load resistance of a receiving end, and a wireless power delivery system using said apparatus. A receiving unit of the wireless power receiving apparatus receives power from a wireless power transmitter. A rectifying circuit unit rectifies the current outputted from the receiving unit and outputs the rectified current. A load resistance modulation unit receives a control signal including a duty ratio, controls the flow of the current applied from the rectifying circuit unit according to the received control signal so as to vary the size of the effective load resistance, and increases the size of the equivalent resistance so as to improve efficiency.
Description
Technical field
The present invention relates to a kind of wireless power transfer system, and particularly relate to the wireless power receiving system that a kind of pay(useful) load resistance by modulating receiving terminal improves power transmission.
Background technology
Wireless power transfer system generally includes conveyer DC power supply, conveyer resonance inverter, transmits resonator, receives resonator, rectification circuit unit and power inverter.In order to provide high efficiency under the restriction of low coupling and little resonator, need the load resistance correspondingly optimizing receiving system.
In addition to efficiency, also need to transmit the ability than the higher power of receiving system power demand.Especially, when there is long distance between conveyer and receiving system, be difficult to provide enough power to receiving system.In addition to distance, load resistance also affects power transmission.So, in order to transmit the power expected to receiving system with high efficiency, need suitably to select load resistance.
Problem is to be difficult to freely change load resistance.Load resistance is determined by the power demand of the device of actual power consumption, and be not the design variable of system.When using impedance inverter circuit, the pay(useful) load resistance from receiving resonator observation can be converted, and improve performance.
But typical impedance inverter circuit has had fixing conversion ratio, freely impedance transformation ratio can not be changed.
In this case, there is such restriction, that is, under the condition of specific distance or specific load current, can Optimal performance, but when distance changes or load current changes, hydraulic performance decline, and system becomes instability.
The power conversion circuit at typical receiving system rear portion only has in the function receiving the power limit power higher than power demand.Thus, when the power received is less than power demand, the power that expectation is provided to loading resistor fully is in fact difficult to.
In the U.S. Patent application US2010/0277003A1 of " self adaptation in wireless power transmission is impedance-tumed " by name, be to control power by the object using DC-DC inverter to change receiving system resistance, instead of increase efficiency.This patent application claimed different control methods and input/output power sensing method in order to increase or reduce power output.But, its object is to power transimission and control instead of increase efficiency.The patent application describes and need not increase efficiency when by using these methods to increase the power of transmission.
On the contrary, the target of present patent application is the efficiency of the auxiliary lower raising resonator at circuit for power conversion, instead of controls power.Even if the receiving system proposed receives identical power at same distance place, run, so receiving system also has high efficiency due under the state that receiving system has been exaggerated at its reflected resistance.With do not add compared with proposed load resistance modulating unit, adding of the load resistance modulating unit proposed provides higher efficiency.
Summary of the invention
Technical problem
A kind of pay(useful) load resistance by modulating receiving terminal is the object of the present invention is to provide to improve the wireless power transfer system of power transimission, this wireless power transfer system can solve following restriction: when specific distance or specific load current, can Optimal performance, but when distance changes or load current changes, because the typical impedance inverter circuit used in typical wireless power transfer system freely can not change impedance transformation ratio, and there is fixing conversion ratio, so hydraulic performance decline, and system becomes unstable.
Technical scheme
In order to achieve the above object, the invention provides a kind of wireless power receiving system, this wireless power receiving system comprises: receiving element, and it is from power transmission device received power; Rectification circuit unit, it carries out rectification to the electric current exported from described receiving element, and exports the electric current of institute's rectification; And load resistance modulating unit, it receives the control signal with duty ratio, regulate the described electric current provided from described rectification circuit unit to change the size of pay(useful) load resistance according to received control signal, and the size increasing reflected resistance is to raise the efficiency.
Beneficial effect
According to the present invention, there is following advantage: can by by pay(useful) load resistance to the direction change that the loading Q value of receiving system increases, and increased efficiency and the power output of whole system by the reflected resistance that increase reflexes to conveyer.
In addition, due to long distance can be there is between wireless power conveyer and wireless power receiving system, and increase reflected resistance when power output is reduced to the power be less than or equal to required for loading resistor thus, therefore there is the advantage that can maintain identical efficiency in longer distance situation and power output.
Accompanying drawing explanation
Fig. 1 (a) and 1 (b) illustrate the correlation between the reception resonator of series connection and reflected resistance device.
Fig. 2 (a) and 2 (b) illustrate the correlation between reception resonator in parallel and reflected resistance device.
Fig. 3 is the block diagram of wireless power transfer system according to an embodiment of the invention.
Fig. 4 is the example of the rectification circuit figure in Fig. 3.
Fig. 5 illustrates first modulation circuit (boosting (boost) type modulation circuit) of the first embodiment of load resistance modulating unit of the present invention.
Fig. 6 illustrates second modulation circuit (booster type modulation circuit) of the second embodiment of load resistance modulating unit of the present invention.
Fig. 7 illustrates the 3rd modulation circuit (SEPIC type modulation circuit) of the 3rd embodiment of load resistance modulating unit of the present invention.
Fig. 8 illustrates the 4th modulation circuit (step-down (buck) type modulation circuit) of the 4th embodiment of load resistance modulating unit of the present invention.
Fig. 9 illustrates the 5th modulation circuit (receiving the flyback modulation circuit (flyback modulation circuit) of pulsating DC voltage input) of the 5th embodiment of load resistance modulating unit of the present invention.
Figure 10 illustrates the 6th modulation circuit (buck-boost-cascade (cascade) type modulation circuit) of the 6th embodiment of load resistance modulating unit of the present invention.
Figure 11 (a) and 11 (b) are the examples carrying out to perform receiving element equally the conversion of serial or parallel connection when receiving element of the present invention comprises series resonant structure and parallel resonance structure in order to increase reflected resistance via modulation load resistance.
Figure 12 is the flow chart of the method for operation of wireless power receiving system in Fig. 3.
Figure 13 is the flow chart of the method for operation of wireless power transfer system in Fig. 3.
Figure 14 (a) is that in the present invention and prior art, delivering power is relative to the curve chart of the distance between wireless power conveyer and wireless power receiving system, and Figure 14 (b) is according to the delivering power of the present invention and the prior art curve chart relative to the distance between conveyer and receiving system.(" load-modulate " represents the present invention and " only rectifier " represents prior art.)
Figure 15 (a) be according to the present invention and prior art when export be 21.6W time efficiency relative to the curve chart of distance, and Figure 15 (b) be in the present invention and prior art when export be 10.9W time efficiency relative to the curve chart of distance.(" load of modulation " represents the present invention and " only rectifier " represents prior art.)
Embodiment
Below, exemplary embodiment of the present invention is described in detail with reference to accompanying drawing.When illustrating of the present invention, in order to unnecessarily fuzzy theme of the present invention, the detailed description relevant to known function or structure will be omitted.
Different variation can be made due to the present invention and there is some embodiments, therefore specific embodiment will be shown in the drawings, and specific embodiment will be described in detail in the present invention or application.But, be not intended to limit the present invention to specific embodiment, and should be understood that the present invention covers all variation, equivalent and/or the substitute that fall within the spirit and scope of the present invention.
When mention any element " to be connected " with another element or " access " time, should be understood that the former with the latter can directly connect or access, or another element can be there is between.Conversely, when any element be called as ' to be directly connected ' with another element or ' directly accessing ' time, should be understood that can there is no other elements between the two.Such as " be positioned at ... between ", " be located immediately at ... between " or " with ... adjacent " and other statements for illustration of interelement relation of " with ... direct neighbor " and so on also should explain in an identical manner.
The term used in the present invention, only for illustration of specific embodiment, is not intended to limit the present invention.Unless otherwise stated, the term of singulative comprises plural form.Should understand, in the present invention, term " comprises " or " having " shows feature, numeral, step, operation, element, parts or its existence of combining, but, do not get rid of one or more other feature, numeral, step, operation, element, parts or its combination existence or interpolation.
Below, the present invention is illustrated in greater detail by referring to accompanying drawing.
Before explaining the present invention, the size of the equivalent resistance in wireless power conveyer can be represented by equation 1 below:
[equation 1]
R
reflected＝k
2ω
0L
1Q
RX。
In this example, k represents the coupling coefficient between the transmission coil in conveyer and the reception resonator in receiving system, L
1represent the inductance transmitting coil, Q
rXrepresentative receives the loading Q value (loaded-Q) of resonator, ω
0be resonance frequency and the inverter switching frequency of resonator, transmit coil with the impact be coupled between receiving system by single equivalent resistance R
reflectedrepresent.
Because the impact of receiving system is reflected to transmission coil, so by equivalent resistance R
reflectedbe called reflected resistance.
As shown in Fig. 1 (a) to 2 (b), reflected resistance R
reflectedwith transmission coil L
1parasitic resistor R
tX parasiticbe connected in series.Thus, high efficiency is increase reflected resistance R with the high condition exported
reflected.
Reflected resistance depends on the Q determined by the load resistance receiving resonator
rX(square formula 1).
When series resonance receiving system, loading Q value and reflected resistance are with load resistance R
lreduce and increase (see Fig. 1), and when parallel resonance receiving system, loading Q value and reflected resistance R
reflectedwith load resistance R
lincrease and increase (see Fig. 2).
Thus, the present invention changes the size of the reflected resistance of pay(useful) load resistance and reception resonator via load resistance modulation circuit, to increase efficiency and the delivering power of delivering power.
Fig. 3 is the block diagram of wireless power transfer system according to an embodiment of the invention.Fig. 4 is the example of the circuit diagram of rectifier in Fig. 3.
As shown in Figure 3, wireless power transfer system 300 of the present invention comprises wireless power conveyer 100 and wireless power receiving system 200.
Wireless power conveyer 100 delivering power.Wireless power conveyer 100 comprises DC power supply and transmits resonant element, and plays the inductor L via transmitting in resonant element
1the power produced from DC power supply is sent to outside effect.
In order to improve the transmission efficiency of wireless power, the size of wireless power receiving system 200 accommodation reflex resistance.
More specifically, wireless power receiving system 200 comprises receiving element 120, rectification circuit unit 130 and load resistance modulating unit 140.
Receiving element 120 is from wireless power conveyer received power.
Rectification circuit unit 130 carries out rectification to the electric current exported from receiving element 120, and exports the electric current of institute's rectification.
Load resistance modulating unit 140 receiving package is containing the control signal of duty ratio, regulate the electric current provided from rectification circuit unit 130 to change the size of pay(useful) load resistance according to received control signal CNT, and the size of reflected resistance in regulating power conveyer, to raise the efficiency.
The operation of control signal CNT control load resistance modulating unit 140, particularly, control signal CNT is the pulse signal with fixing or variable duty ratio, its switching device regularly in ON/OFF load resistance modulating unit 140.
Receiving element 120 can be configured to following structure: inductor L is with capacitor C in series, parallel connection or connect and be connected in parallel.More specific description is provided with reference to Figure 10 below.
Next, with reference to Fig. 4, rectification circuit unit 130 comprises the first rectification unit 131, second rectification unit 132 and rectification circuit unit output filter 133.Rectification circuit unit 130 receives the electric current of institute's rectification from receiving element 120, and received electric current is provided to load resistance modulating unit 140.
First rectification unit 131 comprises two the diode D be connected in series via first node N1, and the second rectification unit 132 comprises two the diode D be 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 and rectification circuit unit output filter C are connected in parallel.
The alternating current provided from receiving element 120 is outputted as direct current via the rectifying device (diode) of the first rectification unit 131 among the output filter C of rectification circuit unit 130.
Load resistance modulating unit 140 plays and regulates the electric current provided from rectification circuit unit 130 to change load resistance R
lthe effect of size.More specifically, it regulates the electric current provided from rectification circuit unit 130 to increase or to reduce the size of pay(useful) load resistance.
Fig. 5 illustrates first modulation circuit (booster type modulation circuit) of the first embodiment of load resistance modulating unit of the present invention.
More specifically, as shown in Figure 5, load resistance modulating unit 140 is different according to the syndeton of the inductor L in receiving element 120 and capacitor C, when connect in series structure, load resistance modulating unit 140 comprises the first modulation circuit 210, second modulation circuit 220 or the 3rd modulation circuit 230, and when parallel connection structure, load resistance modulating unit 140 comprises the 4th modulation circuit 240, the 5th modulation circuit 250 or the 6th modulation circuit 260.
First modulation circuit 210 can be the booster type circuit comprising inductor 211, first switching device 212, second switch device 213 and 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 the first switching device 212 is connected to the 3rd node N3, and its source terminal is connected to the 4th node N4.One end of second switch 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 the first switching device 212.The duty ratio of control signal CNT can have fixing value or change according to the output voltage of loading resistor.
First switching device 212 is switched in alternation with second switch device 213.
When the first switching device 212 is connected, in inductor 211, the electric current of flowing adds up gradually.The electric current flowed in inductor adds up gradually via the first switching device 212 and rectification circuit unit 130.
When the first switching device 212 turns off, the voltage of the 3rd node N3 increases, and once voltage is equal to or higher than the threshold voltage of second switch device 213, then second switch device 213 is connected.Thus, in inductor 211, the electric current of flowing is provided to loading resistor R
l.
Along with whole switch periods period first ratio (such as duty ratio) that is switched on of switching device 212 increase, electric current cumulative gradually increases, the resistance being input to modulator 210 reduces, and because the resistance being input to the first modulation circuit 210 is pay(useful) load resistance, so reflected resistance increases.
Thus, the first modulation circuit 210 regulates electric current according to the duty ratio of control signal CNT (pulse signal), makes compared with typical load resistance, and input resistance reduces, to increase the reflected resistance in wireless power conveyer 100.Therefore, wireless power transmission efficiency and delivering power increase.
Fig. 6 illustrates second modulation circuit (booster type modulation circuit) of the second embodiment of load resistance modulating unit of the present invention.
As shown in Figure 6, the second modulating unit 220 is circuit diagrams that representative receives the example of the booster type circuit of Pulsating DC currents.
More specifically, the second modulation circuit 220 comprises the first switching device 221, second switch device 222 and capacitor 223.
The drain terminal of the first switching device 221 is connected to the 3rd node N3, and its gate terminal is connected to control unit 170, and its source terminal is connected to the 4th 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.Capacitor 223 and second switch device 222 are connected in parallel.
Second modulation circuit 222 is the inductor of load resistance modulating unit in rectification circuit unit output filter C by removing power receiving circuit and the first modulation circuit 210 and the circuit that obtains.
Thus, when the first switching device 221 is connected, the amplitude of the resonance current at receiving element place increases lentamente.In this case, when the connection part (such as, turn-on time part) of the first switching device 221 is longer, in receiving element 120, occur that electric current adds up gradually.Thus, the pay(useful) load resistance at receiving element 120 place reduces, and reflected resistance increases.
Fig. 7 illustrates the 3rd modulation circuit (SEPIC type modulation circuit) of the 3rd embodiment of load resistance modulating unit of the present invention.
As shown in Figure 7,3rd modulation circuit 230 is circuit that representative receives the example of the SEPIC type translation circuit of Pulsating DC currents, more specifically, the 3rd modulation circuit 230 comprises the first switching device 231, second switch device 234, first capacitor 232, second capacitor 235 and inductor 233.
The drain terminal of the first switching device is connected to the 3rd node N3, and its gate terminal is connected to control unit, and its source terminal is connected to the 4th 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.One end of inductor 233 is connected to the 5th node N5, and its other end is connected to the 6th node N6.Second switch device 234 is diodes, and 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 the 7th node N7, and its other end is connected to the 8th node N8.
In this example, as the first switching device 231 reception control signal CNT and when being activated, the electric current being provided to the 3rd node N3 and receiving element 120 increases.In this case, the inductor being connected to the 6th node N6 has the state that electric current adds up gradually, and provides electric current I to the 5th node N5 thus
lS.
Then, when the first switching device 231 turns off, be provided to the 5th node N5's and electric current I
cS+ I
sLconsistent voltage increases to the threshold voltage being greater than second switch device 234.So second switch device 234 is connected, therefore, the electric current being provided to the 5th node N5 increases.
Thus, by regulating pay(useful) load resistance at load resistance modulating unit 140 place, the load resistance R at receiving element 120 place
llarge I increase or reduce.According to this principle, can reduce or increase reflected resistance.
Fig. 8 illustrates the 4th modulation circuit (voltage-dropping type modulation circuit) of the 4th embodiment of load resistance modulating unit of the present invention.
As shown in Figure 8, the 4th modulating unit 240 is representative circuit diagrams for increasing the example of the voltage-dropping type change-over circuit of input resistance.
More specifically, the 4th modulating unit comprises the first switching device 241, second switch device 242, inductor 243 and capacitor 244.
The drain terminal of the first switching device 241 is connected to rectification circuit unit 130, and its gate terminal is connected to control unit 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 the 3rd node N3, and its other end is connected to the 4th 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 the 6th node N6, thus capacitor and inductor are connected in parallel.
When the first switching device 241 reception control signal (pulse signal) and when connecting, pay(useful) load resistance is fixed.If the first switching device 241 turns off, so electric current reduces, and pay(useful) load resistance increases, and has larger reflected resistance in wireless power conveyer thus.
High reflected resistance increases efficiency and power, and thereby increases the power and power delivery efficiency that are sent to wireless power receiving system.
Fig. 9 illustrates the 5th modulation circuit (receiving the flyback modulation circuit of pulsating DC voltage input) of the 5th embodiment of load resistance modulating unit of the present invention.
As shown in Figure 9, the 5th modulation circuit 250 is circuit diagrams that representative receives the example of the flyback modulation circuit of pulsating DC voltage input.
More specifically, 5th modulation circuit 250 comprises kickback transformer 253, first switching device 254, second switch device 255 and capacitor 256, wherein, in kickback transformer 253, the first inductor 251 is wound around according to contrary direction with the coil in the second inductor 252.
For referencely, kickback transformer 253 is formed as follows, that is, the coil in the first inductor 251 and the coil in the second inductor 252 are wound around in the opposite direction, and use corresponding back electromotive force to provide electric current.
One end of first inductor 251 is connected to the 3rd node N3, and its other end is connected to the source terminal of the first switching device 254.The source terminal of the first switching device 254 is connected to the other end of the first inductor 251, and control signal is provided to the gate terminal of the first switching device, and the drain terminal of the first switching device is connected to the 4th node N4.
One end of second inductor 252 is connected to one end of diode, and its other end is connected to one end of capacitor 256.Capacitor 256 is connected with diodes in parallel.
When the first switching device 254 cutoff along be provided to the 5th modulation circuit 250 control signal (pulse signal) shutoff ratio increase and elongated time, the electric current being provided to the second inductor 252 from the first inductor 251 reduces, and the resonance potential of receiving element 120 increases.Thus, pay(useful) load resistance increases.
Thus, receiving element 120 causes the reflected resistance in wireless power conveyer to uprise.High reflected resistance increases power delivery efficiency and power, and is sent to power and the power delivery efficiency increase of wireless power receiving system thus.
Figure 10 illustrates the 6th modulation circuit (buck-boost-cascade connection type modulation circuit) of the 6th embodiment of load resistance modulating unit of the present invention.
6th modulation circuit 260 is circuit diagrams that representative receives the example of the buck-boost-cascade circuit of pulsating DC voltage input.
More specifically, the 6th modulation circuit 260 comprises the first switching device 261, second switch device 262, inductor 263, the 3rd switching device 264, the 4th switching device 265 and capacitor C.
The source terminal of the first switching device 261 is connected to rectification circuit unit 130, and control signal is provided to the gate terminal of the first switching device, and the drain terminal of the first switching 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.One end of second switch device 262 is connected to the 3rd node N3, and its other end is connected to the 4th node N4.The source terminal of the 3rd switching device 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 simultaneously reception control signal CNT (identical pulse signal) to perform ON/OFF operation.
Thus, when first and the 3rd switching device 261 and 264 connection, the electric current on inductor adds up gradually.When accumulation interval gradually (such as, turn-on time part) in short-term, occurs that the resonance potential of receiving element 120 adds up gradually continually.
Thus, the pay(useful) load resistance at receiving element 120 place increases, and the reflected resistance in conveyer correspondingly increases.Therefore, it is possible to increase the power and power delivery efficiency that export from wireless power conveyer 100.
Figure 11 (a) and Figure 11 (b) performs serial or parallel connection conversion so that via modulation load resistance to increase the example of reflected resistance to receiving system equivalently when receiving element of the present invention comprises series resonant structure and parallel resonance structure.
With reference to Figure 11 (a), power interface receiving apparatus comprises by C
2Awith C
2Bboth the series connection and parallel resonance structure that form.
If
then C
2Bimpact be left in the basket, and circuit becomes series resonance.In this case, when load resistance modulating unit controls electric current to reduce pay(useful) load resistance, can increase and load Q value and reflected resistance.
If
then perform the conversion of series resonant structure, and load resistance changes over inverse, make to perform convergent-divergent (such as,
).Thus, along with load resistance R
lincrease, the load resistance changed reduces, and loads the increase of Q value.Therefore, when load resistance modulating unit controls electric current to increase pay(useful) load resistance, reflected resistance can be increased.
With reference to Figure 11 (b), power interface receiving apparatus also comprises by C
2Aand C
2Bboth the series connection formed and parallel resonance structure.
If
then C
2Bimpact be left in the basket, and circuit becomes series resonance.In this case, when load resistance modulating unit controls electric current to increase pay(useful) load resistance, can increase and load Q value and reflected resistance.
If
then receiving element converts parallel resonance structure to, and load resistance changes over inverse, thus performs convergent-divergent.(such as,
).
Thus, along with the reduction of load resistance, the load resistance changed increases, and loads the increase of Q value.Thus, when load resistance modulating unit controls electric current to reduce pay(useful) load resistance, reflected resistance can be increased.
Figure 12 is the flow chart of the method for operation of wireless power receiving system in Fig. 3.
As shown in figure 12, the method for operation S10 of wireless power receiving system comprises receiving step S11, rectifying step S12 and load resistance change step S13.
Receiving step S11 is the step of receiving element from wireless power conveyer 100 received power.
Rectifying step S12 is that rectification circuit unit carries out the step of rectification to the electric current by using the power received to produce.
It is following steps that load resistance changes step S13: load resistance modulating unit 140 receives the control signal with duty ratio, regulate electric current to change the size of pay(useful) load resistance according to control signal CNT, and the size of accommodation reflex resistance, to raise the efficiency.
Duty ratio can be fixing or variable duty ratio, and rectifying step S12 can comprise the step generating Pulsating DC currents.
Figure 13 is the flow chart of the method for operation of wireless power transfer system in Fig. 3.
As shown in figure 13, the method for operation S100 of wireless power transfer system comprises transfer step S110, receiving step S120, rectifying step S130 and load resistance change step S140.
Transfer step S11 is the step of wireless power conveyer 100 delivering power.
Receiving step S120 is the step that wireless power receiving system 200 receives the power transmitted.
Rectifying step S130 is that wireless power receiving system 200 carries out the step of rectification to the electric current by using the power received to generate.
It is following steps that load resistance changes step S140: wireless power receiving system 200 receives the control signal CNT with duty ratio, according to control signal CNT regulate electric current to change the size of pay(useful) load resistance, and correspondingly the size of accommodation reflex resistance to improve power transfer efficiency.
Figure 14 (a) is the present invention and the delivering power of the prior art curve chart relative to the distance between conveyer and receiving system, and Figure 14 (b) is the present invention and the delivering power of the prior art curve chart relative to the distance between conveyer and receiving system.
As shown in Figure 14 (a) and Figure 14 (b), can find out, in the prior art, distance is longer, and the efficiency of delivering power and system is lower.On the contrary, can find out, via load resistance modulating unit, the present invention has delivering power with range-independence and constant and efficiency.
Figure 15 (a) is the present invention and the efficiency when the exporting 21.6W of the prior art curve chart relative to distance, and Figure 15 (b) is the present invention and the efficiency when the exporting 10.9W of the prior art curve chart relative to distance.
Like this, the present invention can receive the output voltage as feedback of receiving system with the size of accommodation reflex resistance (value).In addition, even if when there is long distance, also constant power can be provided.On the contrary, when there is long distance and power output before power inverter is reduced to the power being less than or equal to loading resistor actual needs, prior art can not provide power.
But, because the present invention can increase reflected resistance, even if therefore when longer distance, when there is long distance and power output before power inverter is reduced to the power being less than or equal to loading resistor actual needs, the power output that conveyer needs also can be maintained.
Although use specific embodiment and figure to describe the present invention, the present invention is not limited thereto, and technical spirit of the present invention and below claims equivalency range in, those skilled in the art in the invention can make modifications and changes.
Description of reference numerals
100: wireless power conveyer
120: receiving element
130: rectification circuit unit
140: load resistance modulating unit
200: wireless power receiving system
210: the first modulation circuits
220: the second modulation circuits
230: the three modulation circuits
240: the four modulation circuits
250: the five modulation circuits
260: the six modulation circuits
300: wireless power transfer system
Claims (12)
1. a wireless power receiving system, it comprises:
Receiving element, it is from power transmission device received power;
Rectification circuit unit, it carries out rectification to the electric current exported from described receiving element, and exports the electric current of institute's rectification; And
Load resistance modulating unit, it receives has the control signal of duty ratio, regulates the described electric current provided from described rectification circuit unit to change the size of pay(useful) load resistance according to received control signal, and the size increasing reflected resistance is to raise the efficiency.
2. wireless power receiving system according to claim 1, wherein, described duty ratio is fixing or variable duty ratio.
3. wireless power receiving system according to claim 1 and 2, wherein, described receiving element comprises the inductor and capacitor that are connected in series.
4. wireless power receiving system according to claim 3, wherein, described load resistance modulating unit regulates the described electric current provided from described rectification circuit unit to reduce the size of described pay(useful) load resistance.
5. wireless power receiving system according to claim 4, wherein, described load resistance modulating unit is booster type modulation circuit or voltage boosting-reducing type modulation circuit.
6. wireless power receiving system according to claim 4, wherein, described load resistance modulating unit is SEPIC type modulation circuit.
7. wireless power receiving system according to claim 1 and 2, wherein, described receiving element comprises the inductor and capacitor that are connected in parallel.
8. wireless power receiving system according to claim 7, wherein, described load resistance modulating unit regulates the electric current provided from described rectification circuit unit to increase the size of described pay(useful) load resistance.
9. wireless power receiving system according to claim 8, wherein, described load resistance modulating unit is voltage-dropping type modulation circuit or buck-boost modulation circuit.
10. wireless power receiving system according to claim 8, wherein, described load resistance modulating unit is buck-boost-cascade connection type modulation circuit.
11. wireless power receiving systems according to claim 1 and 2, wherein, described receiving element comprises inductor and two capacitors, wherein, each one among described two capacitors with serial-parallel structure or multiple-series anatomical connectivity to described inductor.
12. wireless power receiving systems according to claim 11, wherein, described load resistance modulating unit is for modulating described pay(useful) load resistance to increase the modulation circuit of the loading Q value of described wireless power receiving system.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2012-0148249 | 2012-12-18 | ||
| 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 |
| KR1020120148249A KR101390954B1 (en) | 2012-12-18 | 2012-12-18 | Wireless power receiving apparatus with automatic load resistance modulation for efficiency and power improvement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104937810A true CN104937810A (en) | 2015-09-23 |
| CN104937810B CN104937810B (en) | 2018-03-30 |
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| 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109314405A (en) * | 2016-06-07 | 2019-02-05 | 罗伯特·博世有限公司 | For contactlessly transmitting the Transmission system of energy |
Families Citing this family (6)
| 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 |
| 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 |
| 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 |
| 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 |
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| US20100277003A1 (en) * | 2009-03-20 | 2010-11-04 | Qualcomm Incorporated | Adaptive impedance tuning in wireless power transmission |
| CN102725939A (en) * | 2009-09-22 | 2012-10-10 | 波尔基斯公司 | Inductive power supply |
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| 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 |
| KR101560853B1 (en) * | 2008-01-07 | 2015-10-15 | 액세스 비지니스 그룹 인터내셔날 엘엘씨 | Inductive power supply with duty cycle control |
| US9362820B2 (en) * | 2010-10-07 | 2016-06-07 | Semiconductor Energy Laboratory Co., Ltd. | DCDC converter, semiconductor device, and power generation device |
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2012
- 2012-12-18 KR KR1020120148249A patent/KR101390954B1/en active IP Right Grant
- 2012-12-18 WO PCT/KR2012/011077 patent/WO2014098279A1/en active Application Filing
- 2012-12-18 CN CN201280078160.7A patent/CN104937810B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100277003A1 (en) * | 2009-03-20 | 2010-11-04 | Qualcomm Incorporated | Adaptive impedance tuning in wireless power transmission |
| CN102725939A (en) * | 2009-09-22 | 2012-10-10 | 波尔基斯公司 | Inductive power supply |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109314405A (en) * | 2016-06-07 | 2019-02-05 | 罗伯特·博世有限公司 | For contactlessly transmitting the Transmission system of energy |
| CN109314405B (en) * | 2016-06-07 | 2022-03-01 | 罗伯特·博世有限公司 | Transmission system for contactless transmission of energy |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104937810B (en) | 2018-03-30 |
| KR101390954B1 (en) | 2014-04-29 |
| WO2014098279A1 (en) | 2014-06-26 |
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