CN112072954B - Multi-input piezoelectric vibration energy acquisition circuit - Google Patents
Multi-input piezoelectric vibration energy acquisition circuit Download PDFInfo
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- CN112072954B CN112072954B CN202010744573.0A CN202010744573A CN112072954B CN 112072954 B CN112072954 B CN 112072954B CN 202010744573 A CN202010744573 A CN 202010744573A CN 112072954 B CN112072954 B CN 112072954B
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- 239000003990 capacitor Substances 0.000 claims abstract description 45
- 238000004146 energy storage Methods 0.000 claims abstract description 11
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 230000003071 parasitic effect Effects 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000002035 prolonged effect Effects 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
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The invention discloses a multi-input piezoelectric vibration energy acquisition circuit which is characterized by comprising a plurality of piezoelectric acquisition modules, an inductor, a first diode, a second diode, an energy storage capacitor and a load, wherein each piezoelectric acquisition module comprises a piezoelectric sheet, a first PNP (plug-and-play) tube, a first NPN (negative-and-positive) tube, a capacitor, a second NPN tube and a second PNP tube; the advantage can gather a plurality of piezoelectric sources, when the alternating current signal phase difference that piezoelectric transducer produced is great, the circuit that proposes can adopt the multiplexing working pattern of timesharing to extract energy from piezoelectric transducer one by one, the circuit that proposes when the alternating current signal phase difference that piezoelectric transducer produced is very little even the same phase can also get into the mode of drawing in step, extract energy simultaneously from a plurality of piezoelectric transducers, moreover, two kinds of working pattern of timesharing multiplexing and synchronous drawing can be according to specific application environment automatic switch, and need not extra control circuit.
Description
Technical Field
The invention relates to an energy acquisition circuit, in particular to a multi-input piezoelectric vibration energy acquisition circuit.
Background
The vibration energy is an energy widely existing in the environment, the vibration energy in the environment is collected to supply power to the wireless sensor network node with low power consumption, the service life of the node can be effectively prolonged, and the conventional piezoelectric energy collecting circuit is mainly designed for a single cantilever beam structure; however, in practical application scenarios, a plurality of piezoelectric transducers may be often mounted on one vibration source to obtain more energy, and in the existing circuit structure for simultaneously acquiring vibration energy by using a plurality of piezoelectric transducers, the problem of shared use of inductors is mainly solved by using a time-division multiplexing method, so that the overall piezoelectric acquisition efficiency is not improved.
Disclosure of Invention
The invention aims to provide a multi-input piezoelectric vibration energy acquisition circuit which is completely self-powered and has higher energy acquisition efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: a multi-input piezoelectric vibration energy acquisition circuit comprises a plurality of piezoelectric acquisition modules, an inductor, a first diode, a second diode, an energy storage capacitor and a load, wherein each piezoelectric acquisition module comprises a piezoelectric sheet, a first PNP tube, a first NPN tube, a capacitor, a second NPN tube and a second PNP tube, one end of each piezoelectric sheet, a base electrode of the second NPN tube, a base electrode of the first PNP tube, a collector electrode of the first NPN tube and a collector electrode of the second PNP tube are connected, an emitter electrode of the second NPN tube, an emitter electrode of the first PNP tube and one end of the capacitor are connected, a collector electrode of the second NPN tube is connected with a base electrode of the second PNP tube, a collector electrode of the first PNP tube is connected with the base electrode of the first NPN tube, the other end of each piezoelectric sheet, the other end of the capacitor, an anode electrode of the first diode and a cathode of the second diode are connected, the emitter of the first NPN tube and the cathode of the first diode are connected with one end of the inductor, the other end of the inductor, one end of the energy storage capacitor and one end of the load are connected, and the emitter of the second PNP tube, the anode of the second diode, the other end of the energy storage capacitor and the other end of the load are all grounded.
Compared with the prior art, the piezoelectric energy collecting module has the advantages that the piezoelectric energy collecting module can collect a plurality of piezoelectric power supplies by arranging a plurality of piezoelectric collecting modules, when the phase difference of alternating current signals generated by the piezoelectric transducers is large, energy can be extracted from the piezoelectric transducers one by one in a time-sharing multiplexing mode, and when the phase difference of the alternating current signals generated by the piezoelectric transducers is small and even the same phase, energy can be extracted from the piezoelectric transducers simultaneously; the energy collecting process is divided into three independent processes, firstly, in the process that the piezoelectric sheet moves from the zero displacement point to the maximum displacement point, the parasitic capacitance in the piezoelectric sheet is continuously charged, when the displacement of the piezoelectric sheet reaches the maximum, the energy storage on the parasitic capacitor in the piezoelectric sheet also reaches the maximum, and at the moment, the first NPN tube or the second PNP tube in the piezoelectric acquisition module is conducted, so that the inductor, the piezoelectric acquisition module with the displacement of the piezoelectric sheet reaching the maximum point and the energy storage capacitor form an LC resonance circuit, the energy stored in the parasitic capacitance of the piezoelectric plate is then transferred to the storage capacitor via LC resonance, when the energy of the parasitic capacitor of the piezoelectric patch is released completely, the voltage of the parasitic capacitor can be reduced to zero, at the moment, the first NPN tube or the second PNP tube is immediately disconnected, the inductor, the first diode, the second diode and the energy storage capacitor form a loop, and the inductor transfers the residual energy to the load; the whole circuit structure can be superposed, namely, the piezoelectric acquisition modules can be added or reduced according to actual application scenes so as to be suitable for different application scenes, and therefore the overall acquisition efficiency of the piezoelectric vibration energy is improved.
Drawings
FIG. 1 is a schematic diagram of the circuit structure of the present invention;
fig. 2 is a circuit structure diagram of the piezoelectric acquisition module of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
A multi-input piezoelectric vibration energy acquisition circuit comprises a plurality of piezoelectric acquisition modules U, an inductor L, a first diode D1, a second diode D2, an energy storage capacitor Cso and a load RL, wherein each piezoelectric acquisition module U comprises a piezoelectric sheet PZT, a first PNP tube Q1, a first NPN tube Q2, a capacitor C1, a second NPN tube Q3 and a second PNP tube Q4, one end of each piezoelectric sheet PZT, a base of the second NPN tube Q3, a base of the first PNP tube Q1, a collector of the first NPN tube Q2 and a collector of the second PNP tube Q4 are connected, an emitter of the second NPN tube Q3, an emitter of the first PNP tube Q1 and one end of the capacitor C1 are connected, a collector of the second NPN tube Q84 is connected with the base of the second PNP tube Q4, a collector of the first PNP tube Q1 is connected with the base of the first diode Q2, the other end of the piezoelectric sheet PZT, the other end of the capacitor C1, a cathode of the first PNP tube Q585 and a cathode of the first PNP tube Q57323, and an emitter of the second PNP tube Q585738 are connected with the emitter of the first PNP tube Q3524, The cathode of the first diode D1 is connected to one end of the inductor L, the other end of the inductor L, one end of the storage capacitor Csto and one end of the load RL are connected, and the emitter of the second PNP transistor Q4, the anode of the second diode D2, the other end of the storage capacitor Csto and the other end of the load RL are all grounded.
The working principle of the above embodiment is as follows: taking one of the piezoelectric energy collection modules U as an example, in a positive half period, that is, when a voltage at one end of the piezoelectric patches PZT is higher than a voltage at the other end, along with a gradual increase of a voltage difference between two ends of the piezoelectric patches PZT, a potential difference between two ends of the capacitor C1 is also continuously increased until the voltage difference between two ends of the piezoelectric patches PZT reaches a peak value, and then the voltage difference between two ends of the piezoelectric patches PZT starts to decrease, but since the charges accumulated on the capacitor C1 are not released by a loop, the voltage difference of the capacitor C1 remains unchanged until the voltage difference between the two ends is greater than a threshold voltage of the first PNP tube Q1, and at this time, the first PNP tube Q1 is turned on, so that the NPN tube Q2 is turned on; at this time, the inductor L, the piezoelectric PZT, the storage capacitor Csto and the second diode D2 form an LC resonant circuit, then the energy stored in the parasitic capacitor of the piezoelectric PZT is transferred to the storage capacitor Csto through LC resonance, when the energy release of the parasitic capacitor of the piezoelectric PZT is completed, the voltage of the parasitic capacitor drops to zero, then the first NPN transistor Q2 is immediately turned off, then the inductor L, the first diode D1, the second diode D2 and the storage capacitor Csto form a circuit, and the inductor L transfers the remaining energy to the load RL;
in a negative half period, namely when the voltage at the other end of the piezoelectric sheet PZT is higher than the voltage at one end, along with the gradual increase of the voltage difference at the two ends of the piezoelectric sheet PZT, the potential difference at the two ends of the capacitor C1 is also continuously increased until the voltage difference at the two ends of the piezoelectric sheet PZT reaches a peak value, and then the voltage difference at the two ends of the piezoelectric sheet PZT starts to decrease, but because the charge accumulated on the capacitor C1 is not released by a loop, the voltage difference of the capacitor C1 is kept unchanged until the voltage difference between the two ends is greater than the threshold voltage of the second NPN tube Q3, and at the moment, the second NPN tube Q3 is conducted, so that the second PNP tube Q4 is conducted; at this time, the inductor L, the piezoelectric PZT, the storage capacitor Csto and the first diode D1 form an LC resonant circuit, then the energy stored in the parasitic capacitor of the piezoelectric PZT is transferred to the storage capacitor Csto through LC resonance, when the energy release of the parasitic capacitor of the piezoelectric PZT is completed, the voltage of the parasitic capacitor drops to zero, the second PNP tube Q4 is immediately turned off, then the inductor L, the first diode D1, the second diode D2 and the storage capacitor Csto form a circuit, and the inductor L transfers the remaining energy to the load RL.
Claims (1)
1. A multi-input piezoelectric vibration energy acquisition circuit is characterized by comprising a plurality of piezoelectric acquisition modules, an inductor, a first diode, a second diode, an energy storage capacitor and a load, wherein each piezoelectric acquisition module comprises a piezoelectric sheet, a first PNP tube, a first NPN tube, a capacitor, a second NPN tube and a second PNP tube, one end of each piezoelectric sheet, a base electrode of the second NPN tube, a base electrode of the first PNP tube, a collector electrode of the first NPN tube and a collector electrode of the second PNP tube are connected, an emitter electrode of the second NPN tube, an emitter electrode of the first PNP tube and one end of the capacitor are connected, a collector electrode of the second NPN tube is connected with the base electrode of the second PNP tube, a collector electrode of the first PNP tube is connected with the base electrode of the first NPN tube, and the other end of each piezoelectric sheet, the other end of the capacitor, the other end of the piezoelectric sheet, the other end of the capacitor, and the load, The positive electrode of the first diode and the negative electrode of the second diode are connected, the emitting electrode of the first NPN tube and the negative electrode of the first diode are connected with one end of the inductor, the other end of the inductor, one end of the energy storage capacitor and one end of the load are connected, and the emitting electrode of the second PNP tube, the positive electrode of the second diode, the other end of the energy storage capacitor and the other end of the load are all grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010744573.0A CN112072954B (en) | 2020-07-29 | 2020-07-29 | Multi-input piezoelectric vibration energy acquisition circuit |
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| CN202010744573.0A CN112072954B (en) | 2020-07-29 | 2020-07-29 | Multi-input piezoelectric vibration energy acquisition circuit |
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| CN112072954B true CN112072954B (en) | 2021-11-05 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6271618B1 (en) * | 1998-09-30 | 2001-08-07 | Siemens Aktiengesellschaft | Method and configuration for driving a capacitive actuator |
| CN210608656U (en) * | 2019-05-14 | 2020-05-22 | 宁波大学 | Scalable multi-source environment energy capture interface circuit based on single inductor |
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2020
- 2020-07-29 CN CN202010744573.0A patent/CN112072954B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6271618B1 (en) * | 1998-09-30 | 2001-08-07 | Siemens Aktiengesellschaft | Method and configuration for driving a capacitive actuator |
| CN210608656U (en) * | 2019-05-14 | 2020-05-22 | 宁波大学 | Scalable multi-source environment energy capture interface circuit based on single inductor |
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