CN107294229A - Wireless energy collection system - Google Patents
Wireless energy collection system Download PDFInfo
- Publication number
- CN107294229A CN107294229A CN201710629782.9A CN201710629782A CN107294229A CN 107294229 A CN107294229 A CN 107294229A CN 201710629782 A CN201710629782 A CN 201710629782A CN 107294229 A CN107294229 A CN 107294229A
- Authority
- CN
- China
- Prior art keywords
- impedance
- antenna
- circuit
- direct current
- wireless
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 230000003321 amplification Effects 0.000 claims abstract description 17
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 17
- 230000009466 transformation Effects 0.000 claims description 45
- 238000013461 design Methods 0.000 claims description 21
- 230000008859 change Effects 0.000 claims description 12
- 230000005684 electric field Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 11
- 238000012545 processing Methods 0.000 description 8
- 230000035945 sensitivity Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
-
- H02J7/025—
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Transmitters (AREA)
Abstract
The present invention relates to a kind of wireless energy collection system, including：Antenna；Passive amplifying circuit, it is connected with antenna for being amplified to the voltage that antenna is exported and carrying out impedance matching to antenna and wireless direct current transducer, and the passive amplifying circuit has：Antenna impedance change-over circuit, it is connected with antenna so as to by the impedance R of antennaAntenna+jXAntennaBe converted to R 'Antenna+jX’Antenna, X 'AntennaAbsolute value be R 'AntennaN times of absolute value, andWireless direct current transducer impedance inverter circuit, it is connected with wireless direct current transducer so as to by the impedance R of wireless direct current transducerConverter+jXConverterBe converted to R 'Converter+jX’ConverterSo that R 'Antenna+jX’AntennaWith R 'Converter+jX’ConverterConjugation；And wireless direct current transducer.Pass through the system, it is possible to achieve good input voltage amplification and good impedance matching, without larger fringe cost or additional component.The invention further relates to a kind of passive voltage conversion match circuit and a kind of sensing device.
Description
Technical field
Present invention relates in general to wireless signal amplification sector, in particular to a kind of wireless energy collection system and
A kind of passive voltage changes match circuit, and the invention further relates to a kind of corresponding sensing device.
Background technology
The life that the rise of Internet of Things gives people brings huge facility, and the improvement of technology of Internet of things is also chased after as industry
By target.One Further aim is the power supply of its wireless sensor node.(it includes one or more wireless sensor node
Wireless senser) be Internet of Things an important component, it is used to carry out real-time data sampling and processing to networked devices
And transmission.Wireless sensor node is due to huge number, and it, which is powered, turns into an outstanding problem.For example, it is assumed that an Internet of Things
Sensor network has 10000 wireless sensor nodes, and the battery lasts of each sensor node are powered 4 years, then
It is average probably to need to change 6.85 batteries daily.It can be seen that, the battery for only changing these sensor nodes has been just one
The work of high cost of labor, not to mention the cost that is spent of regular maintenance to these batteries, electricity inspection etc. and purchase
Buy the cost of battery in itself.In addition, the battery largely changed is not if being acted upon easily polluting environment, and it is waste and old
The processing of battery is the process of a high cost again.With the popularization of Internet of Things, the scale of sensor network is increasing, this
The drawbacks of power supply mode of traditional internet of things sensors node, has highlighted.
With the improvement of integrated circuit technology, the power consumption of wireless sensor node is constantly reduced.Accordingly, in the prior art
Occur in that and collect the RF energy in environment for the scheme that is powered to wireless sensor node, wherein RF energy with
The energy of other forms is compared, and with more preferable controllability and stationary power sources, this is larger excellent in collection of energy application aspect
Gesture.
For example, disclosing a kind of for being wireless senser in the patent document that application publication number is CN105356627A
The RF energy collection device that node is powered, discloses two kinds of radio frequency DC converting circuits, one kind is based on floating in embodiment
Gate transistor, it is another to be based on diode.But both schemes can not all realize voltage amplification so that what circuit can be handled
The amplitude of minimum signal is larger, is unsuitable for low power RF energy and collects.
In addition, disclosing a kind of environment electromagnetics wave energy in application publication number is the A of CN 103227498 patent document
Booster circuit in collector, its disclosed two embodiment is all based on diode, and diode can not realize voltage amplification, make
The amplitude for obtaining the minimum signal that circuit can be handled is very big, is unsuitable for low power RF energy and collects.
The content of the invention
The present invention task be to provide a kind of wireless energy collection system and a kind of passive voltage conversion match circuit, with
And a kind of corresponding sensing device, utilize the system, circuit or sensing device, it is possible to achieve good voltage amplification and good
Good impedance matching, without larger fringe cost or additional component, so as to lift the sensitivity of wireless energy collection system (i.e.
Reduce minimum operating power) and energy conversion efficiency.
In the first aspect of the present invention, the task is solved by a kind of wireless energy collection system, and the system includes：
Antenna, it is used to receive wireless signal and is converted into electric field signal；
Passive amplifying circuit, it is connected to be amplified and to antenna and nothing the voltage that antenna is exported with antenna
Line direct current transducer carries out impedance matching, and the passive amplifying circuit has：
Antenna impedance change-over circuit, it is connected with antenna so as to by the impedance R of antennaAntenna+jXAntennaBe converted to R 'Antenna+jX
’Antenna, wherein RAntennaAnd XAntennaIt is the real and imaginary parts of impedance of the antenna before impedance transformation respectively, and R 'AntennaAnd X 'AntennaRespectively
It is the real and imaginary parts of impedance of the antenna after impedance transformation, X 'AntennaAbsolute value be R 'AntennaN times of absolute value, and N ＞
√3；
Wireless direct current transducer impedance inverter circuit, it is connected with wireless direct current transducer so as to by wireless direct current transducer
Impedance RConverter+jXConverterBe converted to R 'Converter+jX’Converter, wherein RConverterAnd XConverterIt is that wireless direct current transducer turns in impedance respectively
Change the real and imaginary parts of former impedance, and R 'ConverterAnd X 'ConverterIt is wireless direct current transducer respectively after impedance transformation
The impedance R ' after impedance transformation of the real and imaginary parts of impedance, wherein antennaAntenna+jX’AntennaWith wireless direct current transducer through resistance
Anti-rotation change after impedance R 'Converter+jX’ConverterConjugation；And
Wireless direct current transducer, it is connected to change the signal through impedance matching and amplification with passive amplifying circuit
For direct current signal.
It should be noted here that the wireless energy collection system of the present invention can be used for any wireless signal, and it is not only
Radiofrequency signal, and can be used for the signal of other frequency ranges.In addition, the voltage amplification of the present invention is accomplished that, using passive
The amplitude of the output voltage of antenna is amplified as some Primary Components more than or equal to energy collecting system by amplifying circuit
The threshold voltage of (such as direct current transducer) so that these Primary Components being capable of normal work.
Following advantages are at least had according to the wireless energy collection system of the present invention：
(1) pass through the system, it is possible to achieve good impedance matching to improve the energy conversion efficiency of system because
The impedance transformation of antenna and wireless direct current transducer can be each other conjugated, be achieved in optimal by passive amplifying circuit
Impedance matching, so as to realize maximum power transfer.
(2) by the system, (or boosting) can be amplified to input voltage to reach the threshold voltage of corresponding device
(amplitude of wherein described passive amplifying circuit amplification voltage, the cycle of voltage are also possible to change, still, by the nothing
The power of source amplifying circuit does not change), so as to improve the sensitivity of system, reduce minimum operating power, this is based on this
The following of inventor is seen clearly：The present inventor makes discovery from observation, and the gain of passive amplifying circuit of the invention is GIt is passive, it is expressed
Formula is：
Due to X 'AntennaAbsolute value be R 'AntennaN times of absolute value and due to R 'Antenna+jX’AntennaWith R 'Converter+jX’ConverterAltogether
Yoke, therefore X 'ConverterAbsolute value also be R 'ConverterN times of absolute value, and because impedance conjugate relation is understood：R’Antenna=R
’Converter, and X 'Antenna=-X 'Converter, thus the formula can be reduced to：
When n is large,
Thus, by adjusting X 'AntennaAbsolute value and R 'AntennaAbsolute value between ratio (or X 'ConverterAbsolute value with
R’ConverterAbsolute value between ratio) N, the gain G of passive amplifying circuit can be adjustedIt is passive, wherein from above equation,
As N ＞ √ 3, GIt is passive＞ 1.For example, can be by adjusting N by GIt is passiveIt is adjusted to 100 times.As can be seen here, system of the invention
Voltage gain can easily be adjusted to it is larger, so as to improve the sensitivity of system, reduce minimum operating power, because i.e.
Make that the level of voltage converted by antenna from wireless signal is relatively low, passive amplifying circuit of the invention can also be carried
Higher level is raised to, so as to reach subsequent parts, the threshold voltage of for example wireless direct current transducer, its normal work is realized.
(3) passive amplifying circuit of the invention can be only by passive devices such as impedor, i.e. resistance, electric capacity and inductance
Composition, therefore its is with low cost, implementation simple, without specially powering, and is conducive to the extensive of wireless energy collection system
Using and its miniaturized application.
Provided in the preferred scheme of the present invention, the impedor of antenna impedance change-over circuit and/or wireless direct current
The impedance magnitude of the impedor of converter impedance inverter circuit is chosen to the impedance after impedance transformation of antenna
R’Antenna+jX’AntennaWith the impedance R ' after impedance transformation of wireless direct current transducerConverter+jX’ConverterIt is conjugated and X 'AntennaIt is absolute
It is worth for R 'AntennaN times of absolute value.By the preferred scheme, impedance matching and voltage amplification can be neatly realized.
Provided in another preferred scheme of the present invention, antenna impedance change-over circuit and wireless direct current transducer impedance transformation
Circuit includes the middle one or more of resistance, electric capacity and inductance respectively, and is connected respectively with antenna and wireless direct current transducer.
For example, series connection and parallel connection can realize the real part of impedance and/or the adjustment of imaginary part.But in some cases, in order to reduce damage
Consumption, can not use resistance, but carry out impedance adjustment using electric capacity and/or inductance., can be easy by the expansion scheme
The adjustment of impedance is realized on ground, so as to realize desired impedance matching and voltage gain.It should be noted here that the first impedor
It can include one or more identical or different impedors respectively with the second impedor, and not necessarily only include one
Impedor.
Provided in the expansion scheme of the present invention, the high voltage end of antenna impedance change-over circuit is changed with wireless direct current
The high voltage end connection of device impedance inverter circuit, the low-voltage end of antenna impedance change-over circuit turns with wireless direct current transducer impedance
Change the low-voltage end connection of circuit.
Provided in another expansion scheme of the present invention, the gain that N is chosen to antenna impedance change-over circuit is more than
Equal to 50.By the impedance and its connection side that adjust antenna impedance change-over circuit and wireless direct current transducer impedance inverter circuit
Formula, can be easily adjusted N, so that adjust gain.In addition, other gains be also it is contemplated that, such as 10 times, 25 times, 30
Times etc..
Provided in the another expansion scheme of the present invention, the wireless signal is radiofrequency signal or microwave signal.For
RFID radiofrequency signal is widely used signal of communication in logistics field, and its frequency range is, for example, ISM band, and frequency is, for example,
125kHz, 133kHz, 13.56MHz, 27.12MHz, 433MHz, 902-928MHz, 2.45GHz, 5.8GHz etc..In addition, this hair
It is bright to be applied to other frequencies, such as microwave frequency.
Provided in the preferred scheme of the present invention, the wireless energy collection system also includes：
Accumulator, it is connected to store the output charge of wireless direct current transducer with wireless direct current transducer；And
Energy management module, it is connected with accumulator is handled to obtain stabilization for the output signal to accumulator
DC voltage.
Pass through the preferred scheme, it is possible to achieve the storage and processing of the electric energy gathered.Accumulator for example can be electric power storage
Pond, dry cell, button cell, capacitor etc..Energy management module is to the processing of the output signal of accumulator for example including whole
Stream, filtering and level conversion.Pass through the preferred scheme, it is possible to achieve optimized output signal, such as with stable electric current
With suitable voltage, the output signal of low higher hamonic wave.Other processing are also what is be contemplated that, for example, be converted to from direct current signal
Inversion of AC signal etc..
In the second aspect of the present invention, foregoing task changes match circuit to solve by a kind of passive voltage, the circuit
For the first equipment before being connected to the circuit and the second equipment being connected to after the circuit are carried out impedance matching and
The second equipment is conveyed to after the output voltage of the first equipment is changed, the circuit includes：
First design impedance change-over circuit, it is connected with the first equipment so as to by the impedance R of the first equipment1+jX1Be converted to
R’1+jX’1, wherein R1And X1It is the real and imaginary parts of impedance of first equipment before impedance transformation respectively, and R '1And X '1
It is the real and imaginary parts of impedance of first equipment after impedance transformation respectively；And
Second design impedance change-over circuit, it is connected with the second equipment so as to by the impedance R of the second equipment2+jX2Be converted to
R’2+jX’2, wherein R2And X2It is the real and imaginary parts of impedance of second equipment before impedance transformation respectively, and R '2And X '2
It is the real and imaginary parts of impedance of second equipment after impedance transformation respectively, wherein the first design impedance change-over circuit and second
Design impedance change-over circuit is connected, the impedance R ' after impedance transformation of the first equipment1+jX’1Turn with the second equipment through impedance
Impedance R ' after changing2+jX’2It is conjugated and X '2Absolute value be R '2N times of absolute value, wherein adjusting nothing by adjusting N
The voltage conversion coefficient of source match circuit.
By the circuit, impedance matching and voltage-regulation can be realized with low circuit cost, wherein the circuit changes voltage
Amplitude, the cycle of voltage is also possible to change, still, do not change by the power of the circuit.Specific advantage is referred to
The advantage of wireless energy collection system.The fields such as boosting or decompression when the circuit can apply to power transmission.
Provided in the preferred scheme of the present invention, as N ＞ √ 3, passive voltage conversion match circuit is set to first
Standby output voltage is amplified (amplitude of amplification voltage, the cycle of voltage is also possible to change, but power is constant), and
And as N ＜ √ 3, passive voltage conversion match circuit the output voltage of the first equipment is reduced (reduce voltage amplitude,
The amplitude of electric current is provided, the cycle of voltage is also possible to change, but power is constant), wherein the first impedor and/or the
Two impedors include variable resistance, variable condenser and/or variometer., can be easily by the preferred scheme
The voltage conversion coefficient that passive voltage changes match circuit is adjusted, so as to realize the accurate adjustment to voltage.
The present invention a preferred scheme in provide, wherein the impedor of the first design impedance change-over circuit and/or
The impedance magnitude of the impedor of second design impedance change-over circuit be chosen to the first equipment after impedance transformation
Impedance R '1+jX’1With the impedance R ' after impedance transformation of the second equipment2+jX’2It is conjugated and X '2Absolute value be R '2It is exhausted
To N times of value.
Provided in another preferred scheme of the present invention, the gain that N is chosen to antenna impedance change-over circuit is more than
Equal to 50, wherein the first design impedance change-over circuit and/or the second design impedance change-over circuit include variable resistance, can power transformation
Container and/or variometer.Pass through the preferred scheme, it is possible to achieve passive voltage changes match circuit and the height of voltage is increased
Benefit, so as to for example realize voltage amplification.
Provided in the expansion scheme of the present invention, the high voltage end and the second equipment of the first design impedance change-over circuit
The high voltage end connection of impedance inverter circuit, the low-voltage end of the first design impedance change-over circuit and the second design impedance conversion electricity
The low-voltage end connection on road.
Provided in the another preferred scheme of the present invention, wherein the first equipment is antenna, it is used to receive wireless signal simultaneously
Electric field signal is converted into, and the second equipment is wireless direct current transducer, and it is used for the letter through impedance matching and amplification
Number be converted to direct current signal.In addition, the first equipment and the second equipment can also be miscellaneous equipment or device, do not arrange one by one herein
Lift.
In the third aspect of the present invention, foregoing task is solved by sensing device, and the sensing device has according to this hair
Bright described wireless energy collection system and sensor, the wireless energy collection system are that the sensor is powered.The sensing
Device for example can be radio frequency signal receiver, such as RFID tag, or other sensors, such as sonic transducer, optical sensor
Deng wherein the wireless energy collection system using wireless signal, such as radiofrequency signal or microwave signal to these sensors is powered.
Brief description of the drawings
The present invention is expanded on further with reference to specific embodiment below in conjunction with the accompanying drawings.
Fig. 1 shows the block diagram of the wireless energy collection system according to the present invention；
Fig. 2 shows the circuit diagram of the antenna impedance change-over circuit of the wireless energy collection system according to the present invention；
Fig. 3 shows the electricity of the wireless direct current transducer impedance inverter circuit of the wireless energy collection system according to the present invention
Lu Tu；
Fig. 4 is shown to be turned according to antenna, passive amplifying circuit and the wireless direct current of the wireless energy collection system of the present invention
The equivalent circuit of parallel operation；
Fig. 5 shows the impedance diagram after impedance transformation of antenna；
Fig. 6 shows the impedance diagram after impedance transformation of wireless direct current transducer；
Fig. 7 shows the analogous diagram of the gain dependent on frequency；And
Fig. 8 shows the voltage before and after amplifying through passive amplifying circuit and the graph of a relation of frequency.
Embodiment
It should be pointed out that each component in each accompanying drawing perhaps to show, and be not necessarily ratio with illustrating and be exaggerated
Example is correct.In the drawings, it is equipped with identical reference to identical or function identical component.
Unless specifically stated so, in this application, mono- ＂ of ＂, ＂ mono- of measure word ＂ does not exclude the scene of multiple elements.
Fig. 1 shows the block diagram of the wireless energy collection system 100 according to the present invention.
As shown in figure 1, wireless energy collection system 100 has antenna 101, it is used to receive wireless signal and is converted
For electric field signal.Wireless signal can be radiofrequency signal, but can also be the signal of other frequency ranges, such as microwave signal
Deng, this be it will be understood by those skilled in the art that, it is numerous to list herein.
Wireless energy collection system 100 also has passive amplifying circuit 102, and the passive amplifying circuit 102 connects with antenna 101
Connect to be amplified the voltage that antenna 101 is exported and carry out impedance to antenna 101 and wireless direct current transducer 103
Match somebody with somebody.
Passive amplifying circuit 102 has antenna impedance change-over circuit 200, referring to Fig. 2.Fig. 2 is shown according to the present invention's
The circuit diagram of the antenna impedance change-over circuit 200 of wireless energy collection system 100.Antenna impedance change-over circuit 200 has first
Impedor, here, the first impedor include the first inductance 202 and the second inductance 203, their inductance values be respectively L1 and
L2.Impedance 201 is the normal impedance of antenna 101, and its impedance value is R1, generally 50 Ω or 75 Ω.Here, the first inductance 202
Connect and (antenna 101 be connected between high voltage Va and the first inductance 202) with the impedance 201 of antenna 101 later again with second
Inductance 203 is in parallel, but what this was merely exemplary, other connected modes are also what is be contemplated that, as long as can be by the resistance of antenna 101
Anti- 201 are converted to R 'Antenna+jX’Antenna, wherein imaginary part X 'AntennaMould be real part R 'AntennaN times of mould.Here, the first impedance element
Part 201 is connected with antenna 101, so as to by the impedance R of antennaAntenna+jXAntennaBe converted to R 'Antenna+jX’Antenna, wherein RAntennaAnd XAntennaRespectively
It is the real and imaginary parts of impedance of the antenna before impedance transformation, and R 'AntennaAnd X 'AntennaIt is antenna respectively after impedance transformation
Impedance real and imaginary parts.The high voltage end a and low-voltage end b of antenna impedance change-over circuit 200 can be used as antenna impedance
The connection end of change-over circuit 200.
The impedance diagram after impedance transformation of antenna 101 is referring to Fig. 5.As shown in figure 5, the impedance of antenna 101 was 50 originally
Ω or 75 Ω, the impedance after impedance transformation is 5+j500 Ω, real part R ' nowAntennaFor 5 Ω, imaginary part X 'AntennaFor 500 Ω, its
The mould of middle imaginary part is 100 times of the mould of real part.
Passive amplifying circuit 102 also has wireless direct current transducer impedance inverter circuit 300, referring to Fig. 3.Fig. 3 is shown
According to the circuit diagram of the wireless direct current transducer impedance inverter circuit 300 of the wireless energy collection system 100 of the present invention.It is wireless straight
Stream transformer impedance inverter circuit 300 has the second impedor, and second impedor includes inductance 301 and electric capacity herein
302.It should be understood that what this was merely exemplary, in other embodiments, the second impedor can also include resistance
And/or additional inductance and/or additional electric capacity.Here, the resistance of the inductance 301 of the second impedor and wireless direct current transducer
Anti- (such as equivalent input capacitance X of element 303 and 304ConverterWith its equivalent inpnt resistance RConverter) series circuit parallel connection (will nothing
Line direct current transducer with electric capacity 302 with connecting again after the parallel connection of inductance 301), so as to by the impedance R of wireless direct current transducerConverter+
jXConverterBe converted to R 'Converter+jX’Converter, wherein RConverterAnd XConverterIt is resistance of the wireless direct current transducer before impedance transformation respectively
Anti- real and imaginary parts, and R 'ConverterAnd X 'ConverterIt is the real part of impedance of the wireless direct current transducer after impedance transformation respectively
And imaginary part.The high voltage end c and low-voltage end d of wireless direct current transducer impedance inverter circuit 300 can turn as wireless direct current
The connection end of parallel operation impedance inverter circuit 300.In the present embodiment, high voltage end c connections high voltage end a, low-voltage end b connections
Low-voltage end d, to realize the connection of antenna impedance change-over circuit 200 and wireless direct current transducer impedance inverter circuit 300, is completed
The function of voltage conversion.
Fig. 4 shows antenna 101, passive amplifying circuit 102 and the nothing of the wireless energy collection system 100 according to the present invention
The equivalent circuit of line direct current transducer 103.Here, the equivalent circuit of antenna 101 and antenna impedance change-over circuit 200 is 401, and
The equivalent circuit of wireless direct current transducer impedance inverter circuit 300 and wireless direct current transducer 103 is 402.As shown in figure 4, through
The impedance of antenna 101 after impedance transformation is R 'Antenna+jX’Antenna, and the resistance of the wireless direct current transducer 103 after impedance transformation
Resist for R 'Converter+jX’Converter.Here, size and/or connection side by selecting the first impedor and/or the second impedor
Formula so that the impedance R ' after impedance transformation of antennaAntenna+jX’AntennaWith the impedance after impedance transformation of wireless direct current transducer
R’Converter+jX’ConverterConjugation, i.e., real part is equal：R’Antenna=R 'Converter, and imaginary part is equal in magnitude, symbol is opposite：X’Antenna=-X
’Converter；Moreover, X 'AntennaAbsolute value be R 'AntennaN times of absolute value, wherein N ＞ √ 3, antenna impedance after changing in other words
Imaginary part is much larger than real part, i.e.,：|X’|Antenna＞ ＞ | R 'Antenna|.N both can be that integer can also be decimal.
The impedance diagram after impedance transformation of wireless direct current transducer 103 is referring to Fig. 6.As shown in fig. 6, wireless direct current conversion
The impedance of device 103 was 25-j250 Ω originally, and the impedance after impedance transformation is 5-j500 Ω, real part R ' nowConverterFor 5
Ω, imaginary part X 'ConverterFor -500 Ω.As can be seen here, the impedance of the antenna 101 after being changed through impedance and wireless direct current transducer 103
Impedance is conjugated each other, i.e., respectively 5+j500 Ω and 5-j500 Ω, and it is seen that the imaginary part X ' of the impedance of antenna 101Antenna
With the imaginary part X ' of wireless direct current transducer 103ConverterRespectively real part R 'AntennaWith real part R 'ConverterN times, in this N=100.
It is assumed that the level for the wireless signal for being received by antenna and being changed is VA(referring to Fig. 4), then be input to wireless direct current and turn
The input voltage V of parallel operation 103 is：
Thus, the gain of passive amplifying circuit is GIt is passiveFor：
Due to X 'AntennaAbsolute value be R 'AntennaN times of absolute value and due to R 'Antenna+jX’AntennaWith R 'Converter+jX’ConverterAltogether
Yoke, therefore X 'ConverterAbsolute value also be R 'ConverterN times of absolute value, and because impedance conjugate relation is understood：R’Antenna=R
’Converter, and X 'Antenna=-X 'Converter, thus the formula can be reduced to：
When n is large,
As can be seen here, by adjusting X 'AntennaAbsolute value and R 'AntennaAbsolute value between ratio N=X 'Antenna/R’AntennaOr
N=X 'Converter/R’Converter, the gain G of passive amplifying circuit can be adjustedIt is passive, wherein from above equation, as N ＞ √ 3,
GIt is passive＞ 1.For example, can be by adjusting N by GIt is passiveIt is adjusted to 100 times.
Return to Fig. 1, wireless energy collection system 100 also has wireless direct current transducer 103, itself and passive amplifying circuit
102 connect that direct current signal will be converted to through the signal of impedance matching and amplification.
Wireless energy collection system 100 also alternatively have accumulator 104, its be connected with wireless direct current transducer 103 with
Output charge for storing wireless direct current transducer.The energy storage device such as can be battery, electric capacity of accumulator 104.
Finally, wireless energy collection system 100 also alternatively has energy management module 105, and it is connected with accumulator 104
Handled to obtain galvanic current pressure for the output signal to accumulator 104.For example, energy management module 105
Processing to the output signal of accumulator 104 includes rectification, filtering and level conversion etc..Pass through the processing, it is possible to achieve
Optimized output signal, such as with stable electric current and suitable voltage, the output signal of low higher hamonic wave.Other processing
It is also what is be contemplated that, for example, inversion of AC signal etc. is converted to from direct current signal.
Fig. 7 shows the analogous diagram of the gain dependent on frequency.Here, the resonance frequency of the system 100 after impedance matching
Rate is 800MHz, and wherein gain changes with frequency.It can be seen from figure 7 that gain 800MHz when reach it is maximum, i.e. 50
Times.As can be seen here, system 100 of the invention realizes good voltage amplification effect, is achieved in good voltage amplification.
Fig. 8 shows the voltage relationship figure before and after amplifying through passive amplifying circuit.Changed by antenna 101 from wireless signal
And the input ac voltage V comeAAmplitude be 20mV, and through passive amplifying circuit 102 amplify after, wireless direct current conversion
The alternating voltage that amplitude is 1V can be obtained at device 103.1V voltage is enough to open the converter of wireless direct current transducer 103
Part, so that sensitivity and the conversion efficiency of lifting system.
Following advantages are at least had according to the wireless energy collection system 100 of the present invention：
(1) system 100 is passed through, it is possible to achieve good impedance matching is to improve the energy conversion efficiency of system, and this is
Because the impedance transformation of antenna 101 and wireless direct current transducer 103 can be conjugated each other by passive amplifying circuit 102,
Optimal impedance matching is achieved in, so as to realize maximum power transfer.
(2) by the system 100, (or boosting) can be amplified to input voltage to reach corresponding device, such as nothing
The threshold voltage of line direct current transducer, so as to improve the sensitivity of system, reduce minimum operating power, this is based on the present invention
The following of people is seen clearly：The present inventor makes discovery from observation, and the gain of passive amplifying circuit of the invention is GIt is passive, its expression formula is：
Due to X 'AntennaAbsolute value be R 'AntennaN times of absolute value and due to R 'Antenna+jX’AntennaWith R 'Converter+jX’ConverterAltogether
Yoke, therefore X 'ConverterAbsolute value also be R 'ConverterN times of absolute value, and because impedance conjugate relation is understood：R’Antenna=R
’Converter, and X 'Antenna=-X 'Converter, thus the formula can be reduced to：
When n is large,
Thus, by adjusting X 'AntennaAbsolute value and R 'AntennaAbsolute value between ratio (or X 'ConverterAbsolute value with
R’ConverterAbsolute value between ratio) N, the gain G of passive amplifying circuit can be adjustedIt is passive, wherein from above equation,
As N ＞ √ 3, GIt is passive＞ 1.For example, can be by adjusting N by GIt is passiveIt is adjusted to 100 times.As can be seen here, system of the invention
Voltage gain can easily be adjusted to it is larger, so as to improve the sensitivity of system, reduce minimum operating power, because i.e.
Make that the level of voltage converted by antenna from wireless signal is relatively low, passive amplifying circuit of the invention can also be carried
Higher level is raised to, so as to reach subsequent parts, the threshold voltage of for example wireless direct current transducer, its normal work is realized.
(3) passive amplifying circuit 102 of the invention only can be made up of impedor, i.e. resistance, electric capacity and inductance, because
This its with low cost, implementation is simple, is conducive to the large-scale application and its miniaturized application of wireless energy collection system.
In addition, by adjusting N, the diminution of voltage can be equally realized, so as to carry out voltage adjustment.That is, this hair
Bright passive amplifying circuit 102 can equally serve as passive voltage conversion match circuit.Because its principle is identical, just it is not added with herein
To repeat.
In addition, the wireless energy collection system of the present invention can be passive to these to realize in various passive sensors
The effect that sensor is powered.In the present embodiment, the DC voltage exported by energy management module 105 supplies for passive sensor
Electricity；In other embodiments, wireless energy collection system 100 can not also include accumulator 104 and energy management module 105,
The DC voltage directly exported by wireless direct current transducer 103 is powered for passive sensor.
Although some embodiments of the present invention are described in present specification, to art technology
Personnel are it is readily apparent that these embodiments are merely possible to shown in example.It may occur to persons skilled in the art that numerous
Flexible program, alternative solution and improvement project without beyond the scope of this invention.Appended claims are intended to limit this hair
Bright scope, and thereby cover method and structure of these claims and its in the range of equivalents in itself.
Claims (14)
1. a kind of wireless energy collection system, including：
Antenna, it is used to receive wireless signal and is converted into electric field signal；
Passive amplifying circuit, it is connected to be amplified the voltage that antenna is exported and to antenna and wireless straight with antenna
Stream transformer carries out impedance matching, and the passive amplifying circuit has：
Antenna impedance change-over circuit, it is connected with antenna so as to by the impedance R of antennaAntenna+jXAntennaBe converted to R 'Antenna+jX’Antenna, its
Middle RAntennaAnd XAntennaIt is the real and imaginary parts of impedance of the antenna before impedance transformation respectively, and R 'AntennaAnd X 'AntennaIt is antenna respectively
The real and imaginary parts of impedance after impedance transformation, X 'AntennaAbsolute value be R 'AntennaN times of absolute value, and
Wireless direct current transducer impedance inverter circuit, it is connected with wireless direct current transducer so as to by the resistance of wireless direct current transducer
Anti- RConverter+jXConverterBe converted to R 'Converter+jX’Converter, wherein RConverterAnd XConverterWireless direct current transducer respectively impedance transformation with
The real and imaginary parts of preceding impedance, and R 'ConverterAnd X 'ConverterIt is impedance of the wireless direct current transducer after impedance transformation respectively
Real and imaginary parts, wherein antenna impedance change-over circuit is connected with wireless direct current transducer impedance inverter circuit, antenna through resistance
Anti-rotation change after impedance R 'Antenna+jX’AntennaWith the impedance R ' after impedance transformation of wireless direct current transducerConverter+jX’ConverterConjugation；
And
Wireless direct current transducer, it is connected to be converted to the signal through impedance matching and amplification directly with passive amplifying circuit
Flow signal.
2. wireless energy collection system according to claim 1, wherein the impedor of antenna impedance change-over circuit and/or
The impedance magnitude of the impedor of wireless direct current transducer impedance inverter circuit be chosen to antenna after impedance transformation
Impedance R 'Antenna+jX’AntennaWith the impedance R ' after impedance transformation of wireless direct current transducerConverter+jX’ConverterIt is conjugated and X 'Antenna
Absolute value be R 'AntennaN times of absolute value.
3. wireless energy collection system according to claim 2, wherein antenna impedance change-over circuit and wireless direct current are changed
Device impedance inverter circuit includes the middle one or more of resistance, electric capacity and inductance respectively, and respectively with antenna and wireless direct current
Converter is connected.
4. the high voltage end and nothing of wireless energy collection system according to claim 1, wherein antenna impedance change-over circuit
The high voltage end connection of line direct current transducer impedance inverter circuit, the low-voltage end of antenna impedance change-over circuit turns with wireless direct current
The low-voltage end connection of parallel operation impedance inverter circuit.
5. wireless energy collection system according to claim 1, wherein N is chosen to antenna impedance change-over circuit
Gain is more than or equal to 50.
6. wireless energy collection system according to claim 1, believes wherein the wireless signal is radiofrequency signal or microwave
Number.
7. wireless energy collection system according to claim 1, wherein the wireless energy collection system also includes：
Accumulator, it is connected to store the output charge of wireless direct current transducer with wireless direct current transducer；And
Energy management module, it is connected with accumulator is handled straight with what is stablized for the output signal to accumulator
Flow voltage.
8. a kind of passive voltage changes match circuit, the circuit is used for the first equipment before being connected to the circuit and is connected to
The second equipment after the circuit carries out impedance matching and is conveyed to the after the output voltage of the first equipment is changed
Two equipment, the circuit includes：
First design impedance change-over circuit, it is connected with the first equipment so as to by the impedance R of the first equipment1+jX1Be converted to R '1+
jX’1, wherein R1And X1It is the real and imaginary parts of impedance of first equipment before impedance transformation respectively, and R '1And X '1Respectively
It is the real and imaginary parts of impedance of first equipment after impedance transformation；And
Second design impedance change-over circuit, it is connected with the second equipment so as to by the impedance R of the second equipment2+jX2Be converted to R '2+
jX’2, wherein R2And X2It is the real and imaginary parts of impedance of second equipment before impedance transformation respectively, and R '2And X '2Respectively
It is the real and imaginary parts of impedance of second equipment after impedance transformation, wherein the first design impedance change-over circuit and the second equipment
Impedance inverter circuit is connected, the impedance R ' after impedance transformation of the first equipment1+jX’1With the second equipment after impedance transformation
Impedance R '2+jX’2It is conjugated and X '2Absolute value be R '2N times of absolute value, wherein adjusting passive by adjusting N
Voltage conversion coefficient with circuit.
9. passive voltage according to claim 8 changes match circuit, wherein whenWhen, passive voltage conversion matching
Circuit is amplified to the output voltage of the first equipment, and is worked asWhen, passive voltage conversion match circuit is set to first
Standby output voltage is reduced.
10. wireless energy collection system according to claim 8 or claim 9, wherein the impedance of the first design impedance change-over circuit
The impedance magnitude of the impedor of element and/or the second design impedance change-over circuit be chosen to the first equipment through impedance
Impedance R ' after conversion1+jX’1With the impedance R ' after impedance transformation of the second equipment2+jX’2It is conjugated and X '2Absolute value be
R’2N times of absolute value.
11. wireless energy collection system according to claim 8, wherein the high voltage end of the first design impedance change-over circuit
It is connected with the high voltage end of the second design impedance change-over circuit, the low-voltage end and the second equipment of the first design impedance change-over circuit
The low-voltage end connection of impedance inverter circuit.
12. passive voltage according to claim 8 changes match circuit, wherein N is chosen to antenna impedance conversion
The gain of circuit is more than or equal to 50, wherein include can for the first design impedance change-over circuit and/or the second design impedance change-over circuit
Variohm, variable condenser and/or variometer.
13. passive voltage according to claim 8 changes match circuit, wherein the first equipment is antenna, it is used to receive
Wireless signal is simultaneously converted into electric field signal, and the second equipment is wireless direct current transducer, and it is used for through impedance matching
Direct current signal is converted to the signal of amplification.
14. a kind of sensing device, it has wireless energy collection system according to claim 1 and sensor, the nothing
Heat input collection system is that the sensor is powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710629782.9A CN107294229A (en) | 2017-07-28 | 2017-07-28 | Wireless energy collection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710629782.9A CN107294229A (en) | 2017-07-28 | 2017-07-28 | Wireless energy collection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107294229A true CN107294229A (en) | 2017-10-24 |
Family
ID=60102446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710629782.9A Pending CN107294229A (en) | 2017-07-28 | 2017-07-28 | Wireless energy collection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107294229A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932888A (en) * | 2015-02-26 | 2016-09-07 | 立锜科技股份有限公司 | Resonant Wireless Power Receiver Circuit And Control Circuit And Method Thereof |
-
2017
- 2017-07-28 CN CN201710629782.9A patent/CN107294229A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932888A (en) * | 2015-02-26 | 2016-09-07 | 立锜科技股份有限公司 | Resonant Wireless Power Receiver Circuit And Control Circuit And Method Thereof |
Non-Patent Citations (1)
| Title |
|---|
| 靳钊等: "无源UHF RFID标签的低成本阻抗匹配网络设计", 《固体电子学研究与进展》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Noghabaei et al. | A high-sensitivity wide input-power-range ultra-low-power RF energy harvester for IoT applications | |
| WO2008073218A1 (en) | Rf power extracting circuit and related techniques | |
| Dai et al. | A review and design of the on-chip rectifiers for RF energy harvesting | |
| CN102439820A (en) | Power generating apparatus, power generating system, and wireless power transmitting apparatus | |
| CN106452117A (en) | Broadband rectifier for radio frequency energy collecting system | |
| Porto et al. | Wireless power transfer for contactless instrumentation and measurement | |
| Zulkifli et al. | Architecture of ultra low power micro energy harvester using RF signal for health care monitoring system: A review | |
| Mansour et al. | Compact RF rectifier circuit for ambient energy harvesting | |
| CN100459397C (en) | Floating-grid threshold-value adjustable rectifying circuit for radio electronic label | |
| CN104269946B (en) | A kind of radio frequency energy collector | |
| Sivaramakrishnan et al. | A highly efficient power management system for charging mobile phones using RF energy harvesting | |
| Asl et al. | RF to DC micro-converter in standard CMOS process for on-chip power harvesting applications | |
| CN107294228A (en) | Wireless energy collection device | |
| CN107294229A (en) | Wireless energy collection system | |
| CN204103611U (en) | A kind of radio frequency energy collector | |
| CN107332361A (en) | Wireless energy collection device | |
| Yuan et al. | Design techniques for power harvesting of passive wireless microsensors | |
| CN107231007A (en) | Wireless energy collection device | |
| Gharaei Jomehei et al. | A comprehensive survey on UHF RFID rectifiers and investigating the effect of device threshold voltage on the rectifier performance | |
| Pinuela et al. | Analysis of scalable rectenna configurations for harvesting high frequency electromagnetic ambient radiation | |
| CN108736832B (en) | Novel high-efficiency inverse F-class power amplifier multiple harmonic matching circuit | |
| Kazanc et al. | High-Q adaptive matching network for remote powering of UHF RFIDs and wireless sensor systems | |
| Oh et al. | Low-power rf energy harvester circuit design for wearable medical applications | |
| Senadeera et al. | X-band energy harvester with miniaturized on-chip slot antenna implemented in 0.18-μm RF CMOS | |
| Patil et al. | Review on Power Conversion Efficiency Improvement Strategies in RF Energy Harvesting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171024 |