CN107332361A - Wireless energy collection device - Google Patents
Wireless energy collection device Download PDFInfo
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- CN107332361A CN107332361A CN201710629565.XA CN201710629565A CN107332361A CN 107332361 A CN107332361 A CN 107332361A CN 201710629565 A CN201710629565 A CN 201710629565A CN 107332361 A CN107332361 A CN 107332361A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
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- H02J5/005—
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Abstract
The present invention relates to 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 provided so that the impedance R of antennaAntenna+jXAntennaWith the impedance R of wireless direct current transducerConverter+jXConverterConjugation, wherein RAntennaAnd XAntennaIt is the real and imaginary parts of the impedance of antenna respectively, and 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 antenna for the output signal of antenna is converted into direct current signal, wherein the imaginary part X of the impedance of wireless direct current transducerConverterAbsolute value be its real part RConverterN times of absolute value, N ＞ √ 3.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 corresponding 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 wireless energy is received
Acquisition means include：
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 of wireless direct current transducerConverter+jXConverterConjugation, wherein RAntennaAnd XAntenna
It is the real and imaginary parts of the impedance of antenna respectively, and RConverterAnd XConverterBe respectively wireless direct current transducer impedance real part and
Imaginary part；And
Wireless direct current transducer, it is connected with antenna for the output signal of antenna is converted into direct current signal, wherein
The imaginary part X of the impedance of wireless direct current transducerConverterAbsolute value be its real part RConverterN times of absolute value, N ＞ √ 3.
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 of antenna and wireless direct current transducer, input voltage can be amplified (or boosting)
To reach that (amplitude of amplification voltage, the cycle of voltage is also possible to change the threshold voltage of corresponding device, but power is not
Become), so as to improve the sensitivity of system, reduce minimum operating power, this is seeing clearly as follows based on the present inventor：The present invention
People makes discovery from observation, by the impedance of antenna is uniquely set rather than defend tenaciously standard antenna impedance in 50 Ω or 75 Ω,
While the impedance by uniquely setting wireless direct current transducer, it is possible to achieve larger voltage gain GIt is passive, its expression formula is：
Wherein due to the special design according to the present invention to the impedance operator of antenna and wireless direct current transducer so that wireless
The imaginary part X of the impedance of direct current transducerConverterAbsolute value be its real part RConverterN times of absolute value, and due to impedance conjugation
Relation is drawn：RAntenna=RConverter, XAntenna=-XConverter, 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 imaginary part X of the impedance of wireless direct current transducerConverterIt is absolute
Value and its real part RConverterAbsolute value ratio N.
Thus, by setting XConverterAbsolute value and RConverterAbsolute value between ratio N can adjust the electricity of the device
Press 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 passiveAdjustment
For 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, minimum operating power is reduced, should because even the original level converted by antenna from wireless signal is relatively low
Device can also be lifted higher level, so that subsequent parts, the threshold voltage of for example wireless direct current transducer are reached, it is real
Its existing normal work.
(3) in the present invention, cause to meet certain pass by the impedance of direct designing antenna and wireless direct current transducer
System, the need for eliminating to additional impedance matching or change-over circuit, therefore its is with low cost, implementation simple, is conducive to nothing
The large-scale application and its miniaturized application of heat input collection 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 impedance magnitude of antenna and/or wireless direct current transducer is chosen
To cause the impedance R of antennaAntenna+jXAntennaWith the impedance R of wireless direct current transducerConverter+jXConverterIt is conjugated and XConverterAbsolute value
For RConverterN times of absolute value.By the preferred scheme, impedance matching and voltage amplification can be neatly realized.
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, according to wireless direct current
The threshold voltage of converter determines N.By adjusting N, it can make to be input to the Primary Component of wireless direct current transducer, such as change
The voltage of circuit is enlarged into the threshold voltage more than or equal to the Primary Component, so as to realize the normal work of the Primary Component
Make.
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, the impedance R of first equipment1+jX1It is provided so that the impedance R of the first equipment1+jX1With
The impedance R of two equipment2+jX2Conjugation, wherein R1And X1It is the real and imaginary parts of the impedance of the first equipment respectively, and R2And X2Point
It is not the real and imaginary parts of the impedance of the second equipment；And
Second equipment, it is connected with the first equipment to receive the output signal of the first equipment, wherein the impedance of the second equipment
Imaginary part X2Absolute value be its real part R2N times of absolute value, N ＞ √ 3, wherein adjusting the electricity of the second equipment by adjusting N
Press conversion coefficient.
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, whenWhen, 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
WhenWhen, 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 block diagram of the 3rd embodiment of the wireless energy collection device according to the present invention；
Fig. 4 shows the circuit diagram of the antenna impedance change-over circuit of the wireless energy collection device according to the present invention；
Fig. 5 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. 6 shows the antenna and the equivalent electric of wireless direct current transducer of the wireless energy collection device according to the present invention
Road；
Fig. 7 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. 8 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 R of wireless direct current transducerConverter+jXConverterConjugation, its
Middle RAntennaAnd XAntennaIt is the real and imaginary parts of the impedance of antenna respectively, and RConverterAnd XConverterIt is the resistance of wireless direct current transducer respectively
Anti- real and imaginary parts.The impedance of antenna sets and can realized in several ways.For example, according to the real part of the impedance of antenna
Curvilinear function relation between imaginary part and signal frequency, the impedance of antenna is adjusted by setting appropriate signals frequency.In addition,
Can also be by setting the perforate size of antenna, receiving area, geometry to set the impedance of antenna.
Wireless energy collection device 100 also includes wireless direct current transducer 102, and it is connected for antenna with antenna 101
101 output signal (level for example converted by wireless signal, usually alternating signal) is converted to direct current signal, wherein
The imaginary part X of the impedance of wireless direct current transducer 102ConverterAbsolute value be its real part RConverterN times of absolute value, N ＞ √ 3, or
Person | XConverter| ＞ ＞ | RConverter|.This for example can be by the impedance for the device for setting wireless direct current transducer 102 or by even
The second impedor is connect to realize.On how to connect the second impedor, Fig. 3 and Fig. 5 description are referred to.
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. 4 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 the impedance R of wireless direct current transducerConverter+
jXConverterConjugation, wherein RAntennaAnd XAntennaIt is the real and imaginary parts of impedance of the antenna before impedance transformation, R ' respectivelyAntennaAnd X 'AntennaPoint
It is not the real and imaginary parts of impedance of the antenna after impedance transformation, and RConverterAnd XConverterIt is wireless direct current transducer respectively
The real and imaginary parts of impedance.The high voltage end a and low-voltage end b of antenna impedance change-over circuit 106 can turn as antenna impedance
Change the connection end of circuit 106.For example, the high voltage end of high voltage end a and low-voltage end b respectively with wireless direct current transducer 102
With the electrical connection of low-voltage end (not shown).
Fig. 3 shows the block diagram of the 3rd embodiment of the wireless energy collection device 100 according to the present invention.
The difference of Fig. 3 second embodiment and Fig. 1 first embodiment is, passes through wireless direct current transducer impedance transformation
Circuit 105 sets the impedance of wireless direct current transducer impedance 102 rather than directly sets wireless direct current transducer impedance 102
Impedance, this can reduce design difficulty.In other side, two embodiments are all identical.
Fig. 5 shows the wireless direct current transducer impedance inverter circuit of the wireless energy collection device 100 according to the present invention
105 circuit diagram.As shown in figure 5, wireless direct current transducer impedance inverter circuit 105 has the second impedor, described second
Impedor includes inductance 401 and electric capacity 402 herein.It should be understood that what this was merely exemplary, in other embodiments
In, the second impedor can also include resistance and/or additional inductance and/or additional electric capacity.In some cases, in order to
Reduce decay, resistance can not be used but only with electric capacity and/or inductance.Here, the inductance 401 of the second impedor with
(such as equivalent input capacitance X of impedor 403 and 404 of wireless direct current transducer 102ConverterWith its equivalent inpnt resistance RConverter)
Series circuit it is in parallel, so as to by the impedance R of wireless direct current transducerConverter+jXConverterBe converted to R 'Converter+jX’ConverterSo that nothing
The imaginary part X ' of the impedance after impedance transformation of line direct current transducer 102ConverterAbsolute value be its real part R 'ConverterAbsolute value
N times, N ＞ √ 3, or | X 'Converter| ＞ ＞ | R 'Converter|.Wherein R 'ConverterAnd X 'ConverterIt is that wireless direct current transducer turns in impedance respectively
Change the real and imaginary parts of later impedance.This is wireless, and direct current transducer impedance inverter circuit 105 is favourable, because being difficult to sometimes
The impedance of each device of wireless direct current transducer 102 is directly set, but needed by additional impedance element, i.e. the second impedance element
Part realizes impedance adjustment.The high voltage end c and low-voltage end d of wireless direct current transducer impedance inverter circuit 105 can conducts
The connection end of wireless direct current transducer impedance inverter circuit 105.For example, high voltage end c and low-voltage end d can respectively with antenna
101 high voltage end and low-voltage end (not shown) electrical connection.
Fig. 6 shows the antenna 101 and wireless direct current transducer 102 of the wireless energy collection device 100 according to the present invention
Equivalent circuit.Here, the equivalent electric of antenna 101 (alternatively including the impedor of antenna impedance change-over circuit 106 or first)
Road is 501, and wireless direct current transducer 102 is (alternatively including the wireless impedance of direct current transducer impedance inverter circuit 105 or second
Element) equivalent circuit be 502.As shown in fig. 6, the impedance of antenna 101 is RAntenna+jXAntenna, and wireless direct current transducer 103
Impedance (impedance transformation for optionally passing through the second impedor) be RConverter+jXConverter.Here, by designing antenna 101 and/
Or wireless direct current transducer 102 impedance or by select the first impedor and/or the second impedor size and/or
Connected mode so that the impedance R of antennaAntenna+jXAntennaWith the impedance R of wireless direct current transducerConverter+jXConverterConjugation, i.e. real part phase
Deng：RAntenna=RConverter, and imaginary part is equal in magnitude, symbol is opposite：XAntenna=-XConverter；Moreover, XConverterAbsolute value be RConverterIt is exhausted
To N times of value, wherein N ＞ √ 3, in other words its imaginary part be much larger than real part, i.e.,：|XConverter| ＞ ＞ | RConverter|.N both can be integer
It 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 XConverterAbsolute value be RConverterN times of absolute value, and due to RAntenna=RConverter, thus the formula can letter
Turn to：
When n is large,
As can be seen here, by adjusting XConverterAbsolute value and RConverterAbsolute value between ratio N=XConverter/RConverter, can
To adjust the gain G of the device 100It 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) by the impedance design of antenna 101 and wireless direct current transducer 102, input voltage can be amplified (or
Boosting) to reach the threshold voltage of corresponding device, so as to improve the sensitivity of system, reduce minimum operating power, this is base
Following in the present inventor is seen clearly：The present inventor makes discovery from observation, by uniquely set antenna 101 impedance rather than
Defend tenaciously the standard antenna impedance in 50 Ω or 75 Ω, while impedance by uniquely setting wireless direct current transducer 102, can be with
Realize larger voltage gain GIt is passive, its expression formula is：
Wherein due to the special design according to the present invention to antenna and wireless direct current transducer so that wireless direct current transducer
Impedance imaginary part XConverterAbsolute value be its real part RConverterN times of absolute value, and because impedance conjugate relation is drawn：
RAntenna=RConverter, XAntenna=-XConverter, 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 imaginary part X of the impedance of wireless direct current transducerConverterIt is absolute
Value and its real part RConverterAbsolute value ratio.
Thus, by setting XConverterAbsolute value and RConverterAbsolute value between ratio N can adjust the electricity of the device
Press 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 passiveAdjustment
For 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 system
Sensitivity, reduce minimum operating power, because even the original level converted from wireless signal by antenna 101 compared with
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, realizes its normal work.
(3) in the present invention, satisfaction one is caused by the impedance of direct designing antenna 101 and wireless direct current transducer 102
Fixed relation, the need for eliminating to additional impedance matching or change-over circuit, therefore its is with low cost, implementation simple, has
Beneficial to the large-scale application and its miniaturized application of wireless energy collection system.
Fig. 7 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. 7, 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. 8 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 figure 8, 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 (10)
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 of wireless direct current transducerConverter+jXConverterConjugation, wherein RAntennaAnd XAntennaRespectively
It is the real and imaginary parts of the impedance of antenna, and RConverterAnd XConverterIt is the real part and void of the impedance of wireless direct current transducer respectively
Portion；And
Wireless direct current transducer, it is connected with antenna for the output signal of antenna is converted into direct current signal, wherein wirelessly
The imaginary part X of the impedance of direct current transducerConverterAbsolute value be its real part RConverterN times of absolute value, N ＞ √ 3.
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, the impedance of wherein antenna and/or wireless direct current transducer is big
The small impedance R for being chosen to antennaAntenna+jXAntennaWith the impedance R of wireless direct current transducerConverter+jXConverterIt is conjugated and XConverter
Absolute value be RConverterN 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. a kind of sensing device, it has wireless energy collection device according to claim 1 and sensor, described wireless
Energy collecting device is that the sensor is powered.
9. a kind of circuit, the circuit includes：
First equipment, the impedance R of first equipment1+jX1It is provided so that the impedance R of the first equipment1+jX1With the second equipment
Impedance R2+jX2Conjugation, wherein R1And X1It is the real and imaginary parts of the impedance of the first equipment respectively, and R2And X2It is respectively
The real and imaginary parts of the impedance of two equipment；And
Second equipment, it is connected with the first equipment to receive the output signal of the first equipment, wherein the void of the impedance of the second equipment
Portion X2Absolute value be its real part R2N times of absolute value, N ＞ √ 3., wherein adjusting the voltage of the second equipment by adjusting N
Conversion coefficient.
10. passive voltage according to claim 9 changes match circuit, wherein whenWhen, the second equipment receives first
The output voltage of equipment be amplified after voltage, and work asWhen, the output voltage that the second equipment receives the first equipment enters
Voltage after row reduction.
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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 CN201710629565.XA patent/CN107332361A/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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