CN107231007A - Wireless energy collection device - Google Patents
Wireless energy collection device Download PDFInfo
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Abstract
The present invention relates to a kind of wireless energy collection device, including：Antenna, the impedance R of the antennaAntenna+jXAntennaIt is provided so that the impedance R of antennaAntenna+jXAntennaWith the impedance R ' after impedance transformation of wireless direct current transducerConverter+jX’ConverterConjugation；Wireless direct current transducer impedance inverter circuit, the wireless direct current transducer impedance inverter circuit 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 the imaginary part X ' of the impedance after impedance transformation of wireless direct current transducerConverterAbsolute value be its real part R 'ConverterN times of absolute value, N ＞ √ 3；And wireless direct current transducer, it is connected with wireless direct current transducer impedance inverter circuit is converted to direct current signal for outputting it signal.Pass through the device, it is possible to achieve good voltage amplification and good impedance matching.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 device, one
Plant passive voltage conversion match circuit and 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.
Current RF energy collection system generally comprises impedance matching circuit for antenna and subsequent parts progress
Impedance matching is so that transimission power is maximum, wherein the antenna impedance after matched is generally fixed for the Ω of normal impedance 50 or 75 Ω.
However, current RF energy collection system is limited in that its sensitivity is relatively low, i.e., antenna is from low-power radio frequency signal
The level converted is relatively low, it is impossible to reach Primary Component, the unlatching electricity of such as switching device of radio frequency direct current transducer of system
Pressure so that switching device can not normal work, thus such RF energy collection system is difficult to use in low power applications.
The content of the invention
The task of the present invention is to provide a kind of wireless energy collection device and a kind of corresponding sensing device, using described
Device or sensing device, it is possible to achieve good voltage amplification and good impedance matching, without larger fringe cost or
Additional component, so as to lift sensitivity (reducing minimum operating power) and the energy conversion efficiency of wireless energy collection system.
Here, the voltage amplification of the present invention is accomplished that, the amplitude of the output voltage of antenna is carried out using the present apparatus
It is enlarged into the threshold voltage of some Primary Components (such as direct current transducer) more than or equal to energy collecting system so that these passes
Key device being capable of normal work.
In the first aspect of the present invention, the task is solved by a kind of wireless energy collection device, and the device includes：
Antenna, it is used to receive wireless signal and is converted into electric field signal, the impedance R of the antennaAntenna+jXAntennaQuilt
It is arranged so that the impedance R of antennaAntenna+jXAntennaWith the impedance R ' after impedance transformation of wireless direct current transducerConverter+jX’Converter
Conjugation, wherein RAntennaAnd XAntennaIt is the real and imaginary parts of the impedance of antenna respectively, and R 'ConverterAnd X 'ConverterIt is wireless direct current respectively
The real and imaginary parts of the impedance after impedance transformation of converter；
Wireless direct current transducer impedance inverter circuit, the wireless direct current transducer impedance inverter circuit turns with wireless direct current
Parallel operation connection is so as to by the impedance R of wireless direct current transducerConverter+jXConverterBe converted to R 'Converter+jX’ConverterSo that wireless direct current turns
The imaginary part X ' of the impedance after impedance transformation of parallel operationConverterAbsolute value be its real part R 'ConverterN times of absolute value, N ＞ √ 3,
Wherein RConverterAnd XConverterIt is the real and imaginary parts of the impedance of wireless direct current transducer respectively；And
Wireless direct current transducer, it is connected with wireless direct current transducer impedance inverter circuit is used for wireless direct current transducer
The output signal of impedance inverter circuit is converted to 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, such as microwave signal.
Following advantages are at least had according to the wireless energy collection device of the present invention：
(1) pass through the device, it is possible to achieve good impedance matching to improve the energy conversion efficiency of system because
By the antenna that specially designs, i.e. by the way that the impedance of antenna to be specifically designed as to the impedance with wireless direct current transducer each other altogether
Yoke, it is possible to achieve optimal impedance matching, so as to realize maximum power transfer.
(2) by the impedance design and the impedance transformation to wireless direct current transducer of antenna, input voltage can be carried out
Amplification (or boosting) with reach corresponding device threshold voltage (amplitude of amplification voltage, the cycle of voltage is also possible to change,
But power is constant), so as to improve the sensitivity of system, reduce minimum operating power, this is based on the as follows of the present inventor
See clearly：The present inventor makes discovery from observation, by uniquely setting the impedance of antenna rather than defending tenaciously mark in 50 Ω or 75 Ω
Quasi- antenna impedance, while by uniquely to wireless direct current transducer carry out impedance transformation, it is possible to achieve larger voltage gain
GIt is passive, its expression formula is：
Wherein due to according to the present invention to the impedance of antenna and the special design of wireless direct current transducer impedance inverter circuit,
So that the imaginary part X ' of the impedance after impedance transformation of wireless direct current transducerConverterAbsolute value be its resistance after being changed through impedance standard
Anti- real part R 'ConverterN times of absolute value, and because impedance conjugate relation is drawn：RAntenna=R 'Converter, XAntenna=-X 'Converter,
Thus the formula can be reduced to：
When n is large,
As can be seen from the above equation, voltage gain GIt is passiveDepending on the impedance after impedance transformation of wireless direct current transducer
Imaginary part X 'ConverterAbsolute value and the real part R ' of its impedance after impedance transformationConverterAbsolute value ratio N.
Thus, by setting X 'ConverterAbsolute value and R 'ConverterAbsolute value between ratio N can adjust the device
Voltage gain GIt is passive, wherein from above equation, as N ＞ √ 3, GIt is passive＞ 1.For example, can be by adjusting N by GIt is passiveAdjust
Whole is 100 times.As can be seen here, the voltage gain of device of the invention can easily be adjusted to it is larger, so as to improve system
Sensitivity, reduce minimum operating power, because even the original level converted by antenna from wireless signal is relatively low,
The device can also be lifted higher level, so that subsequent parts, the threshold voltage of for example wireless direct current transducer are reached,
Realize its normal work.
(3) wireless direct current transducer impedance inverter circuit of the invention can only by impedor, i.e. resistance, electric capacity and
The passive devices such as inductance are constituted, therefore its is with low cost, implementation simple, without specially powering, and is conducive to wireless energy to receive
The large-scale application and its miniaturized application of collecting system.
Provided in the preferred scheme of the present invention, the device 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 battery,
Capacitor etc..Energy management module is to the processing of the output signal of accumulator for example including rectification, filtering and level conversion.It is logical
Cross the preferred scheme, it is possible to achieve optimized output signal, such as the electric current and suitable voltage, low high order with stabilization are humorous
The output signal of ripple.Other processing are also what is be contemplated that, for example, inversion of AC signal etc. is converted to from direct current signal.
Provided in another preferred scheme of the present invention, processing of the energy management module to the output signal of accumulator includes
Rectification, filtering and level conversion.Pass through the preferred scheme, it is possible to achieve optimized output signal, such as with stable electricity
Stream and suitable voltage, the output signal of low higher hamonic wave.Other processing are also what is be contemplated that, for example, changed from direct current signal
Inversion for AC signal etc..
Provided in another expansion scheme of the present invention, the gain that N is chosen to the device is more than or equal to 50.Separately
Outside, other gains be also it is contemplated that, such as 10 times, 25 times, 30 times etc..
Provided in the preferred scheme of the present invention, the resistance of antenna and/or wireless direct current transducer impedance inverter circuit
Anti- size is chosen to the impedance R of antennaAntenna+jXAntennaWith the impedance R ' through impedance transformation of wireless direct current transducerConverter+
jX’ConverterIt is conjugated and X 'ConverterAbsolute value be R 'ConverterN times of absolute value.By the preferred scheme, can neatly it realize
Impedance matching and voltage amplification.
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, N is determined according to the threshold voltage of wireless direct current transducer.Pass through
N is adjusted, can make to be input to the Primary Component of wireless direct current transducer, the voltage of such as change-over circuit and be enlarged into and be more than or equal to
The threshold voltage of the Primary Component, so as to realize the normal work of the Primary Component.
Provided in the preferred scheme of the present invention, wireless direct current transducer impedance inverter circuit has bridge rectifier electricity
Road.For example, the bridge rectifier includes the one or more branch roads being connected in parallel to each other, each branch road includes the four of cross coupling
Two crystalline substances in individual transistor and the commutation condenser connected with four transistors, and four transistors of each branch road
The drain electrode connection of two transistors in the source electrode of body pipe and the four of adjacent legs transistors.By adjust branch road number,
The size of transistor and the size of commutation condenser, can adjust the size of the second impedor, so as to turn to wireless direct current
The impedance R of parallel operationConverter+jXConverterCarry out intense adjustment.
Provided in the another preferred scheme of the present invention, wireless direct current transducer impedance inverter circuit has charge pump electricity
Road.Charge pump circuit by switch and capacitor constitute, be made up of wherein switching diode, by adjust charge pump series, two
The size of pole pipe and the size of capacitor, can be easily adjusted the size of the second impedor, so as to be changed to wireless direct current
The impedance R of deviceConverter+jXConverterCarry out intense adjustment.
Provided in the expansion scheme of the present invention, wireless direct current transducer impedance transformation electricity include resistance, electric capacity and/
Or inductance, and be connected respectively with wireless direct current transducer.By the expansion scheme, the adjustment of impedance can be easily realized,
So as to realize desired impedance matching and voltage gain.It should be noted here that the second impedor can include one or many
Individual identical or different impedor, and not necessarily only include an impedor.In some cases, in order to reduce resistance
Anti-, the second impedor can only include electric capacity and/or inductance.
In the second aspect of the present invention, foregoing task is solved by a kind of sensing device, and it has according to the present invention's
Wireless energy collection device and sensor, the wireless energy collection device are that the sensor is powered.The sensor for example may be used
To be radio frequency signal receiver, such as RFID tag, or other sensors, such as sonic transducer, optical sensor, wherein profit
Wireless energy collection system with wireless signal, such as radiofrequency signal or microwave signal to these sensors is powered.
In the third aspect of the present invention, foregoing task is solved by a kind of circuit, and the circuit includes：
First equipment, it is used to receive wireless signal and is converted into electric field signal, the impedance R of first equipment1+
jX1It is provided so that the impedance R of the first equipment1+jX1With the impedance R ' after impedance transformation of the second equipment2+jX’2Conjugation,
Wherein R1And X1It is the real and imaginary parts of the impedance of the first equipment respectively, and R '2And X '2It is the second equipment respectively through impedance
The real and imaginary parts of impedance after conversion；
Second design impedance change-over circuit, the second design impedance change-over circuit is connected with the second equipment so as to by second
The impedance R of equipment2+jX2Be converted to R '2+jX’2So that the imaginary part X ' of the impedance after impedance transformation of the second equipment2It is absolute
It is worth for its real part R '2N times of absolute value, N ＞ √ 3, wherein R1And X1It is the real and imaginary parts of the impedance of the second equipment respectively；
And
Second equipment, it is connected with the second design impedance change-over 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, the second equipment receives the output electricity of the first equipment
The voltage after being amplified (amplitude of amplification voltage, the cycle of voltage is also possible to change, but power is constant) is pressed, and
As N ＜ √ 3, the second equipment receive the first equipment output voltage reduced after voltage (reduce voltage amplitude there is provided
The amplitude of electric current, the cycle of voltage is also possible to change, but power is constant).By the preferred scheme, can easily it adjust
Economize on electricity pressure conversion coefficient, so as to realize the accurate adjustment to voltage.
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 first embodiment of the wireless energy collection device according to the present invention；
Fig. 2 shows the block diagram of the second embodiment of the wireless energy collection device according to the present invention；
Fig. 3 shows the circuit diagram of the antenna impedance change-over circuit of the wireless energy collection device according to the present invention；
Fig. 4 shows the electricity of the wireless direct current transducer impedance inverter circuit of the wireless energy collection device according to the present invention
Lu Tu；
Fig. 5 shows the antenna of the wireless energy collection device according to the present invention, wireless direct current transducer impedance transformation electricity
Road and the equivalent circuit of wireless direct current transducer；
Fig. 6 shows the of the wireless direct current transducer impedance inverter circuit of the wireless energy collection device according to the present invention
One embodiment；And
Fig. 7 shows the wireless direct current transducer impedance transformation electricity according to the wireless energy collection device of the present invention
The second embodiment on road.
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 first embodiment of the wireless energy collection device 100 according to the present invention.
As shown in figure 1, wireless energy collection device 100 includes 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.The impedance of the antenna
RAntenna+jXAntennaIt is provided so that the impedance R of antennaAntenna+jXAntennaWith the impedance after impedance transformation of wireless direct current transducer
R’Converter+jX’ConverterConjugation, wherein RAntennaAnd XAntennaIt is the real and imaginary parts of the impedance of antenna respectively, and R 'ConverterAnd X 'ConverterPoint
It is not the real and imaginary parts of the impedance after impedance transformation of wireless direct current transducer.The impedance of antenna is set can be by a variety of
Mode is realized.For example, according to the curvilinear function relation between the real and imaginary parts and signal frequency of the impedance of antenna, by setting
Appropriate signals frequency is put to adjust the impedance of antenna.Furthermore it is also possible to by setting the perforate size of antenna, it is receiving area, several
What shape sets the impedance of antenna.In addition to the impedance of antenna 101 is directly set, electricity can also be changed by antenna impedance
Road 106 carries out impedance transformation to antenna, behind this is referred to description as described in Fig. 2 and Fig. 3.
Wireless energy collection device 100 also has wireless direct current transducer impedance inverter circuit 105, turns on wireless direct current
The circuit diagram of parallel operation impedance inverter circuit 105, refers to Fig. 4.
Fig. 4 shows the wireless direct current transducer impedance inverter circuit of the wireless energy collection system 100 according to the present invention
105 circuit diagram.Wireless direct current transducer impedance inverter circuit 105 has the first impedor, and first impedor exists
This includes inductance 401 and electric capacity 402.It should be understood that what this was merely exemplary, in other embodiments, the first impedance
Element can also include resistance and/or additional inductance and/or additional electric capacity.Here, the inductance 401 of the first impedor with
(such as equivalent input capacitance X of impedor 403 and 404 of wireless direct current transducerConverterWith its equivalent inpnt resistance RConverter)
Series circuit is in parallel (will wirelessly direct current transducer with being connected again with electric capacity 402 after the parallel connection of inductance 401), so as to by wireless direct current
The impedance R of converterConverter+jXConverterBe converted to R 'Converter+jX’ConverterSo that wireless direct current transducer 102 after impedance transformation
Impedance imaginary part X 'ConverterAbsolute value be its real part R 'ConverterN times of absolute value, N ＞ √ 3, or | X 'Converter| ＞ ＞ |
R’Converter|.The high voltage end c and low-voltage end d of wireless direct current transducer impedance inverter circuit 105 can turn as wireless direct current
The connection end of parallel operation impedance inverter circuit 105.For example, high voltage end c and low-voltage end d can be high electric with antenna 101 respectively
Pressure side and the electrical connection of low-voltage end (not shown).
Return to Fig. 1, wireless energy collection device 100 also includes wireless direct current transducer 102, itself and wireless direct current transducer
Impedance inverter circuit 105 connects the output signal of wireless direct current transducer impedance inverter circuit 105 being converted to direct current
Signal.
Wireless energy collection device 100 also alternatively have accumulator 103, its be connected with wireless direct current transducer 102 with
Output charge for storing wireless direct current transducer 102.The energy storage device such as can be battery, electric capacity of accumulator 103.
Finally, wireless energy collection device 100 also alternatively has energy management module 104, and it is connected with accumulator 104
Handled to obtain galvanic current pressure for the output signal to accumulator 103.For example, energy management module 104
Processing to the output signal of accumulator 103 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. 2 shows the block diagram of the second embodiment of the wireless energy collection device 100 according to the present invention.
The difference of Fig. 2 second embodiment and Fig. 1 first embodiment is, by antenna impedance change-over circuit 106 come
The impedance of antenna 101, rather than the directly impedance of designing antenna are set.Design difficulty can so be reduced.In other side, two
Individual embodiment is all identical.
Fig. 3 shows the circuit of the antenna impedance change-over circuit 106 of the wireless energy collection device 100 according to the present invention
Figure.Here, the circuit diagram of antenna impedance change-over circuit 106 has the first impedor, it includes the first inductance 302 and the second electricity
Sense 303, their inductance value is respectively L1 and L2.Impedance 301 is the impedance of antenna 301, and its impedance value is R1, the resistance of such as standard
Anti- 50 Ω or 75 Ω.Here, the first inductance 302 is in parallel with the second inductance 303 again after being connected with the impedance 301 of antenna 101, but
It is that this is merely exemplary, other connected modes are also what is be contemplated that, as long as can be converted to the impedance 301 of antenna 101
R’Antenna+jX’AntennaSo that the impedance R ' after impedance transformation of antennaAntenna+jX’AntennaWith wireless direct current transducer through impedance transformation
Impedance R ' afterwardsConverter+jX’ConverterConjugation, wherein RAntennaAnd XAntennaIt is the real part and void of impedance of the antenna before impedance transformation respectively
Portion, R 'AntennaAnd X 'AntennaIt is the real and imaginary parts of impedance of the antenna after impedance transformation respectively, and R 'ConverterAnd X 'ConverterRespectively
It is the real and imaginary parts of the impedance after impedance transformation of wireless direct current transducer.The high voltage of antenna impedance change-over circuit 106
Hold a and low-voltage end b can as antenna impedance change-over circuit 106 connection end.For example, high voltage end a and low-voltage end b can
Electrically connected with the high voltage end c and low-voltage end d respectively with wireless direct current transducer impedance inverter circuit 105.
Fig. 5 shows the antenna 101 of the wireless energy collection device 100 according to the present invention, wireless direct current transducer impedance
The equivalent circuit of change-over circuit 105 and wireless direct current transducer 102.Here, antenna 101 (is alternatively changed including antenna impedance
The impedor of circuit 106 or second) equivalent circuit be 501, and wireless direct current transducer impedance inverter circuit 105 and wireless straight
The equivalent circuit of stream transformer 102 is 502.As shown in figure 5, the impedance of antenna 101 is RAntenna+jXAntenna, and wireless direct current conversion
The impedance after wireless direct current transducer impedance inverter circuit 105 progress impedance transformation of device 103 is R 'Converter+jX’Converter.
This, hinders by the impedance of designing antenna 101 and/or wireless direct current transducer impedance inverter circuit 105 or by selection first
The size and/or connected mode of anti-element and/or the second impedor so that the impedance R of antennaAntenna+jXAntennaTurn with wireless direct current
The impedance R ' of parallel operationConverter+jX’ConverterConjugation, i.e., real part is equal：RAntenna=R 'Converter, and imaginary part is equal in magnitude, symbol is opposite：XAntenna
=-X 'Converter；Moreover, X 'ConverterAbsolute value be R 'ConverterN times of absolute value, wherein N ＞ √ 3, its imaginary part is long-range in other words
In real part, i.e.,：|X’Converter| ＞ ＞ | R 'Converter|.N both can be that integer can also be decimal.
It is assumed that the level for the wireless signal for being received and being changed by antenna 101 is VA(referring to Fig. 6), then be input to wireless direct current
The input voltage V of converter 102 is：
Thus, the gain of the device is GIt is passiveFor：
Due to X 'ConverterAbsolute value be R 'ConverterN times of absolute value, and due to RAntenna=R 'Converter, thus the formula can be with
It is reduced to：
When n is large,
As can be seen here, by adjusting X 'ConverterAbsolute value and R 'ConverterAbsolute value between ratio N=X 'Converter/R
’Converter, the gain G of the device 100 can be adjustedIt is passive, for example, can be by adjusting N by GIt is passiveIt is adjusted to 100 times.
Following advantages are at least had according to the wireless energy collection device 100 of the present invention：
(1) device 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 by the antenna 101 that specially designs, i.e. by the way that the impedance of antenna 101 is specifically designed as and wireless direct current transducer 102
Impedance be conjugated each other, optimal impedance matching is achieved in, so as to realize maximum power transfer.
(2), can be to input electricity by the impedance design and the impedance transformation to wireless direct current transducer 102 of antenna 101
Pressure is amplified (or boosting) to reach the threshold voltage of corresponding device, so as to improve the sensitivity of system, reduce minimum work
The rate of doing work, this is seeing clearly as follows based on the present inventor：The present inventor makes discovery from observation, by uniquely setting antenna 101
Impedance rather than defend tenaciously standard antenna impedance in 50 Ω or 75 Ω, while by uniquely to wireless direct current transducer 102
Carry out impedance transformation, it is possible to achieve larger voltage gain GIt is passive, its expression formula is：
Wherein due to according to the present invention to the impedance of antenna and the special design of wireless direct current transducer impedance inverter circuit,
So that the imaginary part X ' of the impedance after being changed through impedance standard of wireless direct current transducerConverterAbsolute value be its resistance after being changed through impedance standard
Anti- real part R 'ConverterN times of absolute value, and because impedance conjugate relation is drawn：RAntenna=R 'Converter, XAntenna=-X 'Converter,
Thus the formula can be reduced to：
When n is large,
As can be seen from the above equation, as can be seen from the above equation, voltage gain GIt is passiveDepending on the warp of wireless direct current transducer 102
The imaginary part X ' of impedance after impedance transformationConverterAbsolute value and the real part R ' of its impedance after impedance transformationConverterAbsolute value
Ratio N.
Thus, by setting X 'ConverterAbsolute value and R 'ConverterAbsolute value between ratio N can adjust the device
Voltage gain GIt is passive, wherein from above equation, as N ＞ √ 3, GIt is passive＞ 1.For example, can be by adjusting N by GIt is passiveAdjust
Whole is 100 times.As can be seen here, the voltage gain of device 100 of the invention can easily be adjusted to it is larger, so as to improve and be
The sensitivity of system, minimum operating power is reduced, because even the original level converted by antenna 101 from wireless signal
Relatively low, the device 100 can also be lifted higher level, so as to reach subsequent parts, for example wireless direct current transducer 102
Threshold voltage, realize its normal work.
(3) in the present invention, wireless direct current transducer impedance inverter circuit 105 of the invention can be only by impedance element
The passive device composition such as part, i.e. resistance, electric capacity and inductance, therefore its is with low cost, implementation simple, without specially power,
Be conducive to the large-scale application and its miniaturized application of wireless energy collection system.
Fig. 6 shows the wireless direct current transducer impedance inverter circuit 105 of the wireless energy collection device according to the present invention
First embodiment.
As shown in fig. 6, wireless direct current transducer impedance inverter circuit 105 is bridge rectifier.The bridge rectifier electricity
Road includes one or more branch roads for being connected in parallel to each other, each branch road include cross coupling four transistors (M11, M12, M13,
M14；…；MN1, MN2, MN3, MN4) and the commutation condenser (C11, the C12 that are connected with four transistors；…；CN1,
CN2), and each branch road four transistors (M11, M12, M13, M14；…；MN1, MN2, MN3, MN4) in two crystal
Manage (M12, M14；…；M (N-1) 2, M (N-1) 4) source electrode and adjacent legs four transistors (M11, M12, M13,
M14；…；MN1, MN2, MN3, MN4) in two transistors (M21, M23；…；MN1, MN3) drain electrode connection.Pass through adjustment
The number of branch road, the size of transistor and commutation condenser (C11, C12；…；CN1, CN2) size, second can be adjusted
The size of impedor, so as to the impedance R of wireless direct current transducer 102Converter+jXConverterCarry out intense adjustment.
Fig. 7 shows the wireless direct current transducer impedance inverter circuit 105 of the wireless energy collection device according to the present invention
Second embodiment.
As shown in fig. 7, wireless direct current transducer impedance inverter circuit 105 is charge pump circuit.Charge pump circuit is by switching
Constitute, be made up of wherein switching diode (D1 ... DN), by the series, the diode that adjust charge pump with capacitor (C1 ... CN)
The size of the size and capacitor (C1 ... CN) of (D1 ... DN), can be easily adjusted the size of the second impedor, so that right
The impedance R of wireless direct current transducerConverter+jXConverterCarry out intense adjustment.
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 104 supplies for passive sensor
Electricity；In other embodiments, wireless energy collection system 100 can not also include accumulator 103 and energy management module 104,
The DC voltage directly exported by wireless direct current transducer 102 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 (12)
1. a kind of wireless energy collection device, including：
Antenna, it is used to receive wireless signal and is converted into electric field signal, the impedance R of the antennaAntenna+jXAntennaIt is set
To cause the impedance R of antennaAntenna+jXAntennaWith the impedance R ' after impedance transformation of wireless direct current transducerConverter+jX’ConverterConjugation,
Wherein RAntennaAnd XAntennaIt is the real and imaginary parts of the impedance of antenna respectively, and R 'ConverterAnd X 'ConverterIt is wireless direct current transducer respectively
The impedance after impedance transformation real and imaginary parts；
Wireless direct current transducer impedance inverter circuit, the wireless direct current transducer impedance inverter circuit and wireless direct current transducer
Connection is so as to by the impedance R of wireless direct current transducerConverter+jXConverterBe converted to R 'Converter+jX’ConverterSo that wireless direct current transducer
The impedance after impedance transformation imaginary part X 'ConverterAbsolute value be its real part R 'ConverterN times of absolute value, N ＞ √ 3, wherein
RConverterAnd XConverterIt is the real and imaginary parts of the impedance of wireless direct current transducer respectively；And
Wireless direct current transducer, it is connected with wireless direct current transducer impedance inverter circuit is used for wireless direct current transducer impedance
The output signal of change-over circuit is converted to direct current signal.
2. wireless energy collection device according to claim 1, in addition to：
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.
3. wireless energy collection device according to claim 2, wherein output signal of the energy management module to accumulator
Processing include rectification, filtering and level conversion.
4. wireless energy collection device according to claim 1, wherein antenna and/or wireless direct current transducer impedance transformation
The impedance magnitude of circuit is chosen to the impedance R of antennaAntenna+jXAntennaWith wireless direct current transducer after impedance transformation
Impedance R 'Converter+jX’ConverterIt is conjugated and X 'ConverterAbsolute value be R 'ConverterN times of absolute value.
5. wireless energy collection device according to claim 1, the gain that wherein N is chosen to the device is more than etc.
In 50.
6. wireless energy collection device according to claim 1, believes wherein the wireless signal is radiofrequency signal or microwave
Number.
7. wireless energy collection device according to claim 1, wherein according to the threshold voltage of wireless direct current transducer come
Determine N.
8. wireless energy collection device according to claim 1, wherein wireless direct current transducer impedance inverter circuit has
Bridge rectifier or charge pump circuit.
9. wireless energy collection device according to claim 8, wherein wireless direct current transducer impedance inverter circuit includes
Resistance, electric capacity and/or inductance, and connected and/or in parallel with wireless direct current transducer respectively.
10. a kind of sensing device, it has wireless energy collection device according to claim 1 and sensor, the nothing
Heat input collection device is that the sensor is powered.
11. a kind of circuit, the circuit includes：
First equipment, it is used to receive wireless signal and is converted into electric field signal, the impedance R of first equipment1+jX1Quilt
It is arranged so that the impedance R of the first equipment1+jX1With the impedance R ' after impedance transformation of the second equipment2+jX’2Conjugation, wherein R1
And X1It is the real and imaginary parts of the impedance of the first equipment respectively, and R '2And X '2It is the second equipment respectively after impedance transformation
Impedance real and imaginary parts；
Second design impedance change-over circuit, the second design impedance change-over circuit is connected with the second equipment so as to by the second equipment
Impedance R2+jX2Be converted to R '2+jX’2So that the imaginary part X ' of the impedance after impedance transformation of the second equipment2Absolute value be
Its real part R '2N times of absolute value, N ＞ √ 3, wherein R1And X1It is the real and imaginary parts of the impedance of the second equipment respectively；And
Second equipment, it is connected with the second design impedance change-over circuit.
12. circuit according to claim 11, wherein whenWhen, the second equipment receives the output voltage of the first equipment
Voltage after being amplified, and work asWhen, the second equipment receive the first equipment output voltage reduced after electricity
Pressure.
Priority Applications (1)
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| CN201710629781.4A CN107231007A (en) | 2017-07-28 | 2017-07-28 | Wireless energy collection device |
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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 |
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2017
- 2017-07-28 CN CN201710629781.4A patent/CN107231007A/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》 * |
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Application publication date: 20171003 |