CN109302098B - Zero voltage bias turnover circuit for piezoelectric cantilever beam - Google Patents
Zero voltage bias turnover circuit for piezoelectric cantilever beam Download PDFInfo
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- CN109302098B CN109302098B CN201811077906.8A CN201811077906A CN109302098B CN 109302098 B CN109302098 B CN 109302098B CN 201811077906 A CN201811077906 A CN 201811077906A CN 109302098 B CN109302098 B CN 109302098B
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- 230000007306 turnover Effects 0.000 title description 2
- 239000003990 capacitor Substances 0.000 claims description 6
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000010351 charge transfer process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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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
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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
- H02N2/186—Vibration harvesters
- H02N2/188—Vibration harvesters adapted for resonant operation
Abstract
The invention discloses a zero voltage bias turning circuit for a piezoelectric cantilever beam, which comprises a bias turning circuit, a current zero tracking circuit, a comparator circuit and a monostable trigger, wherein the bias turning circuit is connected with the comparator circuit; the current zero tracking circuit comprises a seventh diode and an eighth diode, the cathode of the seventh diode and the cathode of the eighth diode are both grounded through a third resistor, the anode of the seventh diode is connected to the cathode of a current control current source in the piezoelectric cantilever equivalent circuit model through a first resistor, and the anode of the eighth diode is connected to the anode of the current control current source in the piezoelectric cantilever equivalent circuit model through a second resistor; the comparator circuit comprises a voltage comparator, wherein the non-inverting input end of the voltage comparator is used for inputting fixed reference voltage, the inverting input end of the voltage comparator is connected with the cathode end of the eighth diode, the output end of the voltage comparator is connected with a monostable trigger, and the monostable trigger is connected with the bias flip switch. The invention reduces waste in the charge transfer process, thereby improving the output power outside the natural frequency of the device.
Description
Technical Field
The invention belongs to the field of piezoelectric vibration energy collection, and particularly relates to a zero voltage bias turning circuit for a piezoelectric cantilever beam.
Background
The piezoelectric cantilever beam is used for converting mechanical vibration energy in a natural environment into electric energy to supply power to the micro sensor node. The main limitations of common piezoelectric cantilevers in practical applications are: when the vibration frequency in the environment deviates from the natural frequency of the piezoelectric cantilever beam, the output power of the piezoelectric cantilever beam is sharply reduced, thereby limiting the broadband application of the piezoelectric cantilever beam. The traditional bridge rectifier cannot adjust the output current and the voltage phase of the piezoelectric cantilever beam port, and the waste of electric charge exists in the rectifying process, so that the output power beyond the natural vibration frequency cannot be improved.
The voltage bias turning circuit can adjust the phase relation between the output current and the output voltage of the piezoelectric cantilever beam as a nonlinear technology, so that the output power outside the natural frequency of the piezoelectric cantilever beam is improved.
Disclosure of Invention
The invention discloses a zero voltage bias turning circuit for a piezoelectric cantilever beam, which aims to solve the problem of charge waste of a traditional bridge rectifier circuit and can control a voltage turning process in real time according to external vibration frequency. Through the self-adaptive control of the voltage overturning process, the phase relation between the output current and the output voltage of the piezoelectric energy collecting device can be adjusted, the waste in the charge transmission process is reduced, and the output power outside the natural frequency of the device is improved.
The purpose of the invention is realized by the following technical scheme.
The invention relates to a zero voltage bias turning circuit for a piezoelectric cantilever beam, which comprises a bias turning circuit and a zero switch control circuit, wherein the bias turning circuit is formed by connecting a bias turning switch circuit and a bridge rectifier circuit in parallel; the zero switch control circuit consists of a current zero tracking circuit, a comparator circuit and a monostable trigger;
the current zero tracking circuit comprises a seventh diode and an eighth diode, the cathode of the seventh diode and the cathode of the eighth diode are both grounded through a third resistor, the anode of the seventh diode is connected to the cathode end of the output voltage of the piezoelectric cantilever equivalent circuit model through a first resistor, and the anode of the eighth diode is connected to the anode end of the output voltage of the piezoelectric cantilever equivalent circuit model through a second resistor;
the comparator circuit comprises a voltage comparator, wherein the non-inverting input end of the voltage comparator is used for inputting fixed reference voltage, the inverting input end of the voltage comparator is connected with the negative electrode end of a No. eight diode in the current zero tracking circuit, the output end of the voltage comparator is connected with a monostable trigger, and the monostable trigger is connected with the bias flip-flop.
The ground port of the monostable trigger is grounded, the power supply port of the monostable trigger is connected with a voltage source, the input port of the monostable trigger is connected with the output end of the voltage comparator, and the output port of the monostable trigger is connected with the switch control end of the bias flip-flop.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the zero voltage bias turning circuit disclosed by the invention can control the voltage turning process in real time according to the external vibration frequency. Through the self-adaptive control voltage overturning process, the phase relation between the output current and the output voltage of the piezoelectric cantilever beam can be adjusted, the waste in the charge transmission process is reduced, and therefore the output power outside the natural frequency of the piezoelectric cantilever beam is improved.
Drawings
FIG. 1 is a schematic diagram of a zero voltage bias flipping circuit of a piezoelectric cantilever beam of the present invention;
FIG. 2 is a diagram illustrating the corresponding voltage and current waveforms of the zero-point voltage offset flip-flop circuit according to the present invention;
FIG. 3 is a schematic diagram of an experimental test of the zero-point voltage bias flip circuit of the present invention;
FIG. 4 is a comparison graph of the energy collected by the zero voltage bias flip circuit of the present invention and a conventional bridge rectifier circuit.
Reference signs AV (t) Voltage-controlled Voltage Source, AIs(t) current controlled current source, Lm equivalent inductance, Cm equivalent capacitance, Rm equivalent resistance, VF(t) a voltage source, CmcPiezoelectric cantilever beam capacitor, L inductor, SW bias flip switch, CRECTRectifying capacitor, D1Diode number one, D2Diode number two, D3Diode number three, D4Diode No. four, D7Diode No. seven, D8Eighth diode, U1 monostable flip-flop, U2 voltage comparator, R1A first resistance, R2Second resistance, R3The third resistance is set to a third value,
ground, Vcc voltage source。
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the zero voltage bias flipping circuit for a piezoelectric cantilever according to the present invention includes a bias flipping circuit and a zero switch control circuit. The bias turning circuit is formed by connecting a bias turning switch circuit and a bridge rectifier circuit in parallel, and the zero switch control circuit is formed by a current zero tracking circuit, a comparator circuit and a monostable trigger.
The bias tumbler switch circuit includes an inductor L and a bias tumbler switch SW connected in series. The bridge rectifier circuit comprises four diodes and a rectifier capacitor CRECTAnd (4) forming. The four diodes are respectively a first diode D1Diode D2Diode D3And a fourth diode D4Wherein, the first diode D1And a fourth diode D4When conducting, the second diode D2And a third diode D3Cutting off; second diode D2And a third diode D3When conducting, the first diode D1And a fourth diode D4And (6) cutting off. The inductance L may take the value 1 mH.
The bias turning circuit is connected with the output end of the piezoelectric cantilever equivalent circuit model, and the piezoelectric cantilever equivalent circuit model comprises a voltage-controlled voltage source AV (t) and a current-controlled current source AIs(t), an equivalent inductance Lm, an equivalent capacitance Cm, an equivalent resistance Rm and a voltage source V are connected in series between the anode and the cathode of the voltage-controlled voltage source AV (t)F(t), the current control current source AIs(t) a piezoelectric cantilever capacitor C is connected in parallel between the two endsmc. Wherein, the equivalent inductance Lm represents the equivalent mass of the piezoelectric cantilever beam, the equivalent capacitance Cm represents the mechanical rigidity of the piezoelectric cantilever beam, the equivalent resistance Rm represents the mechanical damping, and the voltage source V is providedF(t) represents the equivalent input stress of the piezoelectric cantilever, and A represents the piezoelectric coupling coefficient of the piezoelectric cantilever.
The current zero tracking circuit comprises a seventh diode D7And a firstEight-size diode D8The seventh diode D7Negative pole of (1) and eighth diode D8All the negative electrodes of the first and second resistors are connected through a third resistor R3Ground connection
The seventh diode D7The anode passes through a first resistor R1Output voltage negative electrode end V connected to piezoelectric cantilever beam equivalent circuit modelP-The eighth diode D8The anode passes through a second resistor R2Output voltage positive terminal V connected to piezoelectric cantilever equivalent circuit modelP+. Wherein the first resistor R1And a second resistor R2All can take the value of 1k, and a third resistor R3The value may be 500 omega.
The comparator circuit comprises a voltage comparator U2, wherein the non-inverting input end of the voltage comparator U2 is used for inputting a fixed reference voltage VREFThe inverting input end of the voltage comparator U2 is connected with a eighth diode D in the current zero tracking circuit8The output end of the voltage comparator U2 is connected with a monostable trigger U1, and the monostable trigger U1 is connected with a bias flip-flop SW.
The ground port GND of the monostable trigger U1 is grounded
The power supply port V + of the monostable trigger U1 is connected with a voltage source VCCThe input port TRIG of the monostable flip-flop U1 is connected with the output end of the voltage comparator U2, and the output port OUT of the monostable flip-flop U1 is connected with the switch control end of the bias flip-flop SW.
Fig. 2 is a schematic diagram of a corresponding voltage-current waveform of the zero-point voltage bias flip-flop circuit. The bias flip circuit works in the following mode: whenever a current I flowss(t) when zero point is passed, the bias flip switch SW is turned on, and the inductor L and the piezoelectric cantilever beam capacitor C are turned onmcAnd forming a resonant circuit, wherein the closing time of the bias flip switch SW is half of the period of the resonant circuit. If each element is ideal, the bias flip-flop SW is turned on for a half cycle and then turned offStatic capacitance inside the piezoelectric cantilever beam (namely the piezoelectric cantilever beam capacitance C)mc) The voltage values at the two ends can become the opposite numbers of the voltage values when the two ends are conducted, so that the voltage inversion is realized. After voltage is turned over, the output current of the piezoelectric cantilever beam is in phase with the output voltage, so that the output power is improved. For a real circuit element, the absolute value of the switching voltage may be lower than the initial value due to the parasitic resistance.
The zero switch control circuit provides accurate switch pulse signals for the bias flip switch, and the pulse generation time is current Is(t) each time zero point is passed, the high level time of the pulse is L-CmcHalf of the resonant period of the resonant circuit. The current zero tracking circuit consists of two paths of diodes and a current-limiting resistor, wherein each path is respectively connected with the output voltage V of the piezoelectric cantilever beamP+And VP-Are connected. The diode partially drains and rectifies the output current Is of the piezoelectric cantilever beam, and then the rectified current flows through a resistor R7, and a voltage drop V Is generated on a resistor R7zeroRepresents the zero point of the piezoelectric cantilever output current Is. The comparator circuit enables the voltage drop V when the output current of the piezoelectric cantilever beam crosses the zero pointzeroIs converted into an output pulse signal VcompSaid voltage V beingzeroConnected with the inverting input end of the comparator, the non-inverting input end of the comparator is a fixed reference voltage VREF＝50mV，VcompIs the current zero crossing point time, but VcompIs uncertain. The monostable flip-flop can change VcompThe pulse signal is converted into a pulse signal V with high level time fixed to half of the resonant period of the L-Cmc resonant circuitSW. In summary, at any sinusoidal oscillation frequency, the zero switch control circuit ultimately provides the precise switching pulse signal V for the biased flipper switch SWSW。
Example (b):
the experimental setup of a specific embodiment is shown in fig. 3, and comprises: the device comprises a digital oscilloscope, a function signal generator, a zero switch control circuit, a power amplifier, a piezoelectric cantilever beam PPA2014, a vibration table, a driving power supply and the like. Wherein the piezoelectric energy collector is fixed on the vibration table through a clamp.
The vibration frequency range in the specific embodiment is 70-160Hz, and the acceleration is 1 g. The inductor L adopts a 1mH low series resistance inductor 18105C, the bias flip switch SW adopts a low on-resistance switch MA4645, and the first diode D1Diode D2Diode D3Diode D4Diode D7Diode number eight8The Schottky diode BAT54 is adopted, the voltage comparator U2 is TLV3492, and the monostable flip-flop U1 is LTC 6993-1. Fig. 4 is a comparison graph of the collected energy of the zero switch control circuit and a traditional bridge rectifier circuit. Fig. 4 shows that the collected power bandwidth is higher when the zero switch control circuit is used than when the conventional bridge rectifier circuit is used. The result shows that the bias flip circuit can adjust the phase relation between the output current and the output voltage of the piezoelectric cantilever beam as a nonlinear technology, so that the output power outside the natural frequency of the piezoelectric cantilever beam is improved.
While the present invention has been described in terms of its functions and operations with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise functions and operations described above, and that the above-described embodiments are illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined by the appended claims.
Claims (1)
1. The utility model provides a zero point voltage bias upset circuit for piezoelectricity cantilever beam which characterized in that, includes bias upset circuit and zero point switch control circuit, bias upset circuit is parallelly connected by bias upset switch circuit and bridge rectifier circuit and is constituteed, bias upset switch circuit includes inductance (L) and bias upset Switch (SW) of series connection, bridge rectifier circuit is by four diodes and a rectifier capacitor (C)RECT) Forming; the zero switch control circuit consists of a current zero tracking circuit, a comparator circuit and a monostable trigger;
the current zero tracking circuit comprises a seventh diode (D)7) And eighth diode (D)8) The seventh diode (D)7) Negative pole of (2) and the eighth diode (D)8) All through a third resistor (R)3) Ground, the seventh diode (D)7) The positive electrode is connected to the first resistor (R)1) The eighth diode (D) is connected to the output voltage negative end of the piezoelectric cantilever beam equivalent circuit model8) The anode passes through a second resistor (R)2) The output voltage positive end is connected to the piezoelectric cantilever equivalent circuit model;
the comparator circuit comprises a voltage comparator (U2), the non-inverting input end of the voltage comparator (U2) is used for inputting a fixed reference voltage, and the inverting input end of the voltage comparator (U2) is connected with a eighth diode (D) in the current zero tracking circuit8) The output end of the voltage comparator (U2) is connected with a monostable trigger (U1), and the monostable trigger (U1) is connected with a bias flip-flop (SW);
the ground port of the monostable flip-flop (U1) is grounded, and the power supply port of the monostable flip-flop (U1) is connected with a voltage source (V)CC) The input port of the monostable flip-flop (U1) is connected with the output end of the voltage comparator (U2), and the output port of the monostable flip-flop (U1) is connected with the switch control end of the bias flip-flop (SW).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811077906.8A CN109302098B (en) | 2018-09-16 | 2018-09-16 | Zero voltage bias turnover circuit for piezoelectric cantilever beam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811077906.8A CN109302098B (en) | 2018-09-16 | 2018-09-16 | Zero voltage bias turnover circuit for piezoelectric cantilever beam |
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| CN109302098A CN109302098A (en) | 2019-02-01 |
| CN109302098B true CN109302098B (en) | 2020-04-28 |
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| CN113395016B (en) * | 2021-08-05 | 2024-03-29 | 合肥工业大学智能制造技术研究院 | Piezoelectric energy collection system based on inductance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101232170A (en) * | 2007-01-26 | 2008-07-30 | 固纬电子实业股份有限公司 | Automatic switchover circuit and power supplying circuit with automatic switchover function |
| CN206945129U (en) * | 2017-05-20 | 2018-01-30 | 天津大学（青岛）海洋工程研究院有限公司 | A kind of novel vibrating frequency sensor system based on switched capacitor technique |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101232170A (en) * | 2007-01-26 | 2008-07-30 | 固纬电子实业股份有限公司 | Automatic switchover circuit and power supplying circuit with automatic switchover function |
| CN206945129U (en) * | 2017-05-20 | 2018-01-30 | 天津大学（青岛）海洋工程研究院有限公司 | A kind of novel vibrating frequency sensor system based on switched capacitor technique |
Non-Patent Citations (1)
| Title |
|---|
| "An Efficient Piezoelectric Energy Harvesting Interface Circuit Using a Bias-Flip Rectifier and Shared Inductor";Yogesh K.Ramadass,Aanantha P.Chandrakasan;《IEEE》;20091222;正文第189-204页 * |
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