CN106411178A - Voltage synchronous multi-flip piezoelectric kinetic energy harvesting circuit - Google Patents
Voltage synchronous multi-flip piezoelectric kinetic energy harvesting circuit Download PDFInfo
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- CN106411178A CN106411178A CN201610938812.XA CN201610938812A CN106411178A CN 106411178 A CN106411178 A CN 106411178A CN 201610938812 A CN201610938812 A CN 201610938812A CN 106411178 A CN106411178 A CN 106411178A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/181—Circuits; Control arrangements or methods
Abstract
The invention provides a voltage synchronous multi-flip piezoelectric kinetic energy harvesting circuit, which is characterized by comprising an inductor L, a load RL and a voltage flip path in serial connection. The voltage synchronous multi-flip piezoelectric kinetic energy harvesting circuit can be regarded as a fourth-generation piezoelectric energy harvesting circuit. Two design purposes are to remove a manual regulation voltage source used in a third-generation design to realize automatic bias voltage regulation and further to enhance the energy harvesting efficiency of the circuit. Based on theoretical summary and deduction from one-time and two-time voltage flip schemes, a technical rule for realizing synchronous multiple-time voltage flip is brought forward. On the premise of maximally balancing the circuit complexity and the energy harvesting efficiency, a piezoelectric kinetic energy harvesting circuit which needs no additional voltage source and adapts to synchronous three-time voltage flip can be realized.
Description
Technical field
The present invention relates to a kind of power modulate circuit that can lift piezoelectricity kinetic energy collecting efficiency.
Background technology
Environmental energy collection technique by surrounding with different physical form exist energy harvesting, concentrate and change
For available electric energy, for such as wearable health detection/monitoring device (consumer level) and wireless sensor network node
The low power consuming devices such as internet of things equipment (technical grade) are powered.As a kind of conventional electromechanical transducer, piezoelectric has machinery
Structure is simple, be easy to be miniaturized and output voltage is big, the advantages of be conducive to power to nurse one's health it is adaptable to micro-dimension, low-power consumption
Mechanical kinetic energy (such as human motion or mechanical vibration) collects application.Research showed, the improvement of energy collection circuit is to pressure in the past
The lifting of electric flux collection system prisoner's energy performance has remarkable effect.
The development after three generations so far of piezoelectric energy collecting circuit, from using Universal bridge commutator, also known as standard prisoner
Can (SEH：Standard energy harvesting) circuit；Capture energy to the synchro switch inductance with milestone significance
(SSHI：Synchronized switch harvesting on inductor) circuit；Arrive the univoltage source in recent years proposing again
Prebias (prisoner's energy) (SSPB：Single source pre-biasing) circuit.The circuit in two generations next is directed in piezoelectricity original paper
Portion's capacitance characteristic, the voltage targetedly executing respectively once and twice at piezoelectric element deformation extreme value quickly overturns.?
Under identical vibrational excitation, same piezoelectric element can will collect as many as power ascension several times by using these circuit.However, the
The circuit of three generations must be used the reference bias voltage that a hand adjustment direct voltage source overturns as voltage twice, and this design is not
Beneficial to practical application.
The present invention, using the circuit design of innovation, increased voltage while realizing Automatic adjusument bias voltage source and turns over
The number of times turning, had both lifted collection of energy efficiency, makes the multiple reverse circuit of voltage synchronous have more practical engineering application again and is worth.
Content of the invention
The purpose of the present invention is：Realize while Automatic adjusument bias voltage source, increasing the number of times of voltage upset.
In order to achieve the above object, technical scheme provides a kind of voltage synchronous and repeatedly overturns piezoelectricity kinetic energy receipts
Collector, its feature includes inductance L, the load R connectingLAnd voltage upset branch road, wherein：
Voltage upset branch road inner automatic adjustment produces M bias voltage, including M electrical switch and for limiting input
Voltage overturns the diode of the current direction of branch road, when input voltage overturns the electric current zero crossing from positive to negative of branch road, and
Input voltage overturn the electric current of branch road from negative to positive zero crossing when, M electrical switch is successively in one section of suitable time point closure
Open so that piezoelectric transducer output voltage is synchronously repeatedly overturn with respect to M bias voltage after the specific time.
Preferably, collection of energy realized by described voltage upset branch road simultaneously.
Preferably, it is also independently from the collection of energy branch road that described voltage overturns branch road, collection of energy branch road is exclusively used in
Collection of energy, now, described voltage upset branch road is exclusively used in realizing voltage turn over function.
Preferably, the output filter capacitor that described collection of energy branch road includes rectifier bridge and is connected to rectification bridge output end
Cr.
Preferably, described voltage upset branch road have the positive terminal communicating with the output cathode circuit of piezoelectric transducer and with
The negative pole end that the output negative pole circuit of piezoelectric transducer communicates, described voltage upset branch road also includes electrical switch S1, electronic cutting
Close S2, electrical switch S3, electrical switch S4, electrical switch S5, electrical switch S6, diode D1, diode D2, diode D3, two poles
Pipe D4, diode D5, diode D6, storage capacitor Cb, wherein：
Electrical switch S1With diode D1Parallel connection, electrical switch S2With diode D2Series connection, electrical switch S3With diode D3
Series connection, electrical switch S4With diode D4Parallel connection, electrical switch S5With diode D5Series connection, electrical switch S6With diode D6String
Connection, diode D1Anode, diode D2Anode, diode D3Negative electrode connect positive terminal, diode D4Anode, two poles
Pipe D5Anode, diode D6Negative electrode connect negative pole end, diode D1Negative electrode, diode D4Negative electrode connect storage capacitor Cb
One end, storage capacitor CbThe other end connect electrical switch S2, electrical switch S3, electrical switch S5, electrical switch S6.
The present invention can be considered the piezoelectric energy-capturing circuit of forth generation, and the purpose of its design has two：Remove in third generation design
The hand adjustment voltage source that (univoltage source prebias energy collection circuit) uses, realizes automatically adjusting of bias voltage；Carry further
Rise the collection of energy efficiency of circuit.Based on once and twice voltage is overturn with scheme theory summary and deduction, the present invention proposes
Realize the technical manual of the multiple upset of voltage synchronous.In farthest balancing circuitry complexity and collection of energy efficiency
On the premise of it is achieved that a piezoelectricity kinetic energy collecting circuit without additional electric potential source, synchronous three upsets of adaptive voltage.
Brief description
Fig. 1 (a) is that the voltage synchronous of tandem type repeatedly overturn (hereinafter referred to as S-SMBF) piezoelectricity kinetic energy collecting circuit mould
Type；
Fig. 1 (b) is that the voltage synchronous of parallel connection type repeatedly overturn (hereinafter referred to as P-SMBF) piezoelectricity kinetic energy collecting circuit mould
Type；
Fig. 2 (a) is S-SMBF operating characteristic oscillogram；
Fig. 2 (b) overturns instantaneous waveform amplification figure for S-SMBF voltage；
Fig. 2 (c) is P-SMBF operating characteristic oscillogram；
Fig. 2 (d) overturns instantaneous waveform amplification figure for P-SMBF voltage；
Fig. 3 (a) schemes (voltage-charge curve of piezoelectricity original paper source two ends output) for the S-SMBF working cycle；
Fig. 3 (b) schemes (voltage-charge curve of piezoelectricity original paper source two ends output) for the P-SMBF working cycle；
Fig. 4 is that a kind of three upset (hereinafter referred to as P-S3BF) piezoelectricity of the parallel connection type voltage synchronous disclosed in embodiment move
Can collecting circuit；
Fig. 5 (b), (d), (f), (h), (j) are each work process of P-S3BF circuit and the sense of current；
Fig. 5 (a), (c), (e), (g), (i) be respectively Fig. 5 (b), (d), (f), (h), (j) corresponding piezoelectricity output voltage,
Current waveform；
Fig. 6 (a) is the operating characteristic waveform of P-S3BF；
Fig. 6 (b) is flipped up instantaneous enlarged drawing for synchronizing voltage；
Fig. 6 (c) downwardly turns over instantaneous enlarged drawing for synchronizing voltage；
Fig. 7 is that all kinds of typical piezoelectric prisoners circuit energy can collect power contrast.
Specific embodiment
For making the present invention become apparent, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Voltage synchronous proposed by the invention repeatedly overturn (hereinafter referred to as SMBF) piezoelectricity kinetic energy collecting circuit model, are
Following piezoelectric vibration energy collecting circuit provides new mentality of designing.SMBF model passes through multiple synchronizing voltage upset and improves
Electromechanical conversion efficiency, reduces the energy loss of interface circuit in energy conversion process simultaneously, thus in same mechanical excitation
Under improve the output of piezoelectric energy capacity gauge and circuit further.
Shown in tandem type SMBF model such as Fig. 1 (a) of the present invention, shown in parallel connection type SMBF model such as Fig. 1 (b).As Fig. 2
(a) to Fig. 2 (d) Suo Shi, the moment being zero in piezoelectric transducer output current, the switch S in Fig. 1 (a) and Fig. 1 (b)+1,
S+2..., V+MOpen so that piezoelectric transducer output voltage is same after suitable time point closes one specific time successively
Step ground is with respect to a series of bias voltage (VB, 1, VB, 2..., VB, M) carry out multiple rotary movement, it is possible to obtain higher voltage
Amplitude, thus improve the energy that piezoelectricity source obtains further.
Fig. 3 (a) and Fig. 3 (b) is that (transverse axis is to flow out piezoelectricity equivalent electric using more visual and understandable circuit working cycle figure
The electric charge in stream source, the longitudinal axis is the voltage at its two ends) show the trend of each several part energy in piezoelectric energy collection system.Black by periphery
The total graphic area that line is surrounded is the gross energy acquired in piezoelectric transducer, and different gray scales are not for voltage upset, rectifier bridge (two
Pole pipe) and load the energy that (prisoner can be equivalent) is consumed.Voltage upset multiple step by step makes the energy consumption of each voltage upset
Dissipate and reduce further, generally reduce the conversion heat dissipation (middle grey parts area) to collected energy for the modulate circuit.This
Outward, the raising further (longitudinal length of enclosed area) of output voltage amplitude also implies that in Fig. 3 (a) and Fig. 3 (b), figure is total
The expansion of area, final loading section (i.e. light grey) area increases, and energy harvesting capabilities obtain and improve further.
According to SMBF model proposed by the invention, Fig. 4 illustrates one of application example：P-S3BF.The present invention's
It is mainly used in the long-time no battery of low-power consumption micro electronic equipment and power (as all kinds of wireless sensers).
P-S3BF includes a rectifier bridge (four diode Db1, Db2, Db3And Db4), export commutation capacitor Cr, inductance L, six
Road Current Limiting Diodes D1、D2、D3、D4、D5、D6With electrical switch S1、S2、S3、SS、S5、S6, and the auxiliary storage that bias voltage is provided
Can electric capacity Cb.In conventional power source design, the realization of electrical switch has diode, double pole triode (BJT), insulated-gate type field effect
(MOSFET) and insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) etc. should be managed.For
Reduce the overall power attenuation of Circuits System, and in view of the higher output voltage of piezoelectric transducer, can be selected for low-voltage and drive
Ejector half power MOSFET realizes each switching function, and low-power scm realizes the real-time control of switch, and diode rectifier bridge is also
Available Schottky realizes the passive rectification of lower pressure drop.Under conditions of outside machinery is with the vibrational excitation of constant position, piezoelectric energy-conversion
Device can be equivalent to a current source ieqWith built-in electric capacity CpIt is in parallel.When circuit enters stable state, output characteristic waveform has positive and negative two
Individual symmetric periodic, specifically can be divided into ten working stages altogether.
Five working stages of positive half period are described below：
1. open-circuit voltage OC stage (Fig. 5 (a), (b))：This stage starts from after negative half-cycle terminates.Voltage overturns branch road
(Bias-flip path) and collection of energy branch road (harvesting branch path) are blocked.Current source ieqTo CpPositive
Charge, therefore piezoelectric transducer output voltage vp(CpBoth end voltage) from current potential-V3Rise to V0.
2. constant voltage CV stage (Fig. 5 (c), (d))：This stage diode rectifier bridge turns on, ieqFlow into collection of energy to prop up
Road.Because CrMuch larger than Cp, vpIt is clamped to V0.Current source ieqEnergy income summation and load R in this stageLHalf machinery
That dissipates in the vibration period can amount phase equilibrium.
3. first time voltage upset BF1 stage (Fig. 5 (e), (f))：This stage starts from ieqFrom positive to negative during zero crossing.At this
Stage only switchs S1And S6Conducting.Now voltage reference level is Vb, CpIn electric charge be flowed into the C more much bigger than itbIn, directly
To vpReach first extreme value V1.The flow direction of electric current is by diode D6Limited, therefore, electric current one-way flow within this stage is straight
Go to zero at the end of this stage.CbAbsorb part in this stage and be derived from CpEnergy.
4. second voltage upset BF2 stage (Fig. 5 (g), (h))：The and then BF1 stage in this stage.Only have in this stage
Switch S4Conducting, the sense of current is by diode D1Limited, and consistent with direction on last stage.CpIn flow of charge zero potential.
vpPolarity inversion, CbNoenergy changes.
5. third time voltage upset BF3 stage (Fig. 5 (i), (j))：The and then BF2 stage in this stage.Only have in this stage
Switch S2And S4Conducting.The flow direction of electric current is by diode D2Limited.Now voltage reference level is-Vb, by a part is electric
Lotus is from CbIt is injected into CpIn, can be by vpIt is driven to a lower magnitude of voltage V3.
Through five working stages of above-mentioned positive half period, ensuing negative half-cycle also has similar five work rank
Section.It should be noted that in BF1 stage CbFrom CpThe energy being absorbed with BF3 stage CbTo CpThe energy being injected is equal.
And in BF2 stage CbNoenergy changes.Therefore after circuit enters steady-working state, CbNet energy input in each cycle
It is zero, and situation about adaptively be encouraged according to external mechanical, provide optimal bias voltage for tertiary voltage upset.
To the experimental results of the P-S3BF circuit prototype board steady operation signature waveform based on above-mentioned design principle with
Design object is coincide, and the synchronizing voltage upset of each working stage reaches design requirement (as shown in Fig. 6 (a) to Fig. 6 (c)).Fig. 7 pair
Ratio illustrates different piezoelectric energy-capturing circuit, the feelings that output (collection of energy power) changes with output voltage in experiment test
Condition.The P-S3BF circuit that the design is proposed in aggregate balancing circuit complexity and is lifted under two aspects of collection of energy power,
Enhancing efficiency will be collected to the 125% of P-SSHI circuit, the 387% of standard bridge rectifier, with respect to existing piezoelectricity prisoner
Energy circuit, effectively improves collection efficiency, has suitable practical significance.
Claims (5)
1. a kind of voltage synchronous repeatedly overturn piezoelectricity kinetic energy collecting circuit it is characterised in that including the inductance L of series connection, load RLWith
And voltage upset branch road, wherein：
Voltage upset branch road inner automatic adjustment produces M bias voltage, including M electrical switch and be used for limiting input voltage
The diode of the current direction of upset branch road, when input voltage overturns the electric current zero crossing from positive to negative of branch road, and in input
Voltage overturn the electric current of branch road from negative to positive zero crossing when, M electrical switch is specific in one section of suitable time point closure successively
Time after open so that piezoelectric transducer output voltage is synchronously repeatedly overturn with respect to M bias voltage.
2. a kind of voltage synchronous repeatedly overturn piezoelectricity kinetic energy collecting circuit it is characterised in that described electricity as claimed in claim 1
Pressure turns branch road and is provided simultaneously with collection of energy.
3. a kind of voltage synchronous repeatedly overturn piezoelectricity kinetic energy collecting circuit it is characterised in that also including as claimed in claim 1
Overturn the collection of energy branch road of branch road independent of described voltage, collection of energy branch road is exclusively used in collection of energy, now, described voltage
Upset branch road is exclusively used in realizing voltage turn over function.
4. a kind of voltage synchronous repeatedly overturn piezoelectricity kinetic energy collecting circuit it is characterised in that described energy as claimed in claim 2
Amount is collected branch road and is included rectifier bridge and the output filter capacitor C being connected to rectification bridge output endr.
5. a kind of voltage synchronous repeatedly overturn piezoelectricity kinetic energy collecting circuit it is characterised in that institute as claimed in claim 1 or 2
State voltage upset branch road and be there is the positive terminal being communicated with the output cathode circuit of piezoelectric transducer and the output with piezoelectric transducer
The negative pole end that cathode traces communicate, described voltage upset branch road also includes electrical switch S1, electrical switch S2, electrical switch S3, electricity
Son switch S4, electrical switch S5, electrical switch S6, diode D1, diode D2, diode D3, diode D4, diode D5, two poles
Pipe D6, storage capacitor Cb, wherein：
Electrical switch S1With diode D1Parallel connection, electrical switch S2With diode D2Series connection, electrical switch S3With diode D3Series connection,
Electrical switch S4With diode D4Parallel connection, electrical switch S5With diode D5Series connection, electrical switch S6With diode D6Series connection, two poles
Pipe D1Anode, diode D2Anode, diode D3Negative electrode connect positive terminal, diode D4Anode, diode D5Sun
Pole, diode D6Negative electrode connect negative pole end, diode D1Negative electrode, diode D4Negative electrode connect storage capacitor CbOne end,
Storage capacitor CbThe other end connect electrical switch S2, electrical switch S3, electrical switch S5, electrical switch S6.
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| CN201610938812.XA CN106411178B (en) | 2016-10-25 | 2016-10-25 | Voltage synchronous repeatedly overturns piezoelectricity kinetic energy collecting circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039155A (en) * | 2018-08-15 | 2018-12-18 | 天津大学 | A kind of adaptive-biased reverse circuit for piezoelectric energy collecting device |
| CN110212780A (en) * | 2019-03-27 | 2019-09-06 | 西安电子科技大学 | A kind of synchronous switch condenser network in parallel obtained for piezoelectric energy |
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| CN104270033A (en) * | 2014-09-24 | 2015-01-07 | 北京林业大学 | Self-powered P-SSHI circuit |
| CN105262352A (en) * | 2015-11-19 | 2016-01-20 | 中国人民解放军国防科学技术大学 | Nonlinear interface circuit for wide band piezoelectric generation and direct current voltage control method for nonlinear interface circuit |
| CN106026719A (en) * | 2016-05-25 | 2016-10-12 | 西安电子科技大学 | P-SSHI active rectifier circuit and self-powered electronic equipment |
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| CN104270033A (en) * | 2014-09-24 | 2015-01-07 | 北京林业大学 | Self-powered P-SSHI circuit |
| CN105262352A (en) * | 2015-11-19 | 2016-01-20 | 中国人民解放军国防科学技术大学 | Nonlinear interface circuit for wide band piezoelectric generation and direct current voltage control method for nonlinear interface circuit |
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| JUNRUI LIANG等: "Best voltage bias-flipping strategy towards maximum piezoelectric power generation", 《JOURNAL OF PHYSICS》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039155A (en) * | 2018-08-15 | 2018-12-18 | 天津大学 | A kind of adaptive-biased reverse circuit for piezoelectric energy collecting device |
| CN109039155B (en) * | 2018-08-15 | 2020-03-13 | 天津大学 | Self-adaptive bias flip circuit for piezoelectric energy collecting device |
| CN110212780A (en) * | 2019-03-27 | 2019-09-06 | 西安电子科技大学 | A kind of synchronous switch condenser network in parallel obtained for piezoelectric energy |
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