CN111064388A - Multi-piezoelectric combined energy acquisition circuit - Google Patents
Multi-piezoelectric combined energy acquisition circuit Download PDFInfo
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- CN111064388A CN111064388A CN202010012734.7A CN202010012734A CN111064388A CN 111064388 A CN111064388 A CN 111064388A CN 202010012734 A CN202010012734 A CN 202010012734A CN 111064388 A CN111064388 A CN 111064388A
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- 239000003990 capacitor Substances 0.000 claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 40
- 238000004146 energy storage Methods 0.000 claims abstract description 15
- 238000003306 harvesting Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 2
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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
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Abstract
The invention discloses a multi-piezoelectric combined energy acquisition circuit which is characterized by comprising a plurality of piezoelectric energy acquisition modules, a first inductor, a first fly-wheel diode, a first energy storage capacitor and a load, wherein each piezoelectric energy acquisition module comprises a piezoelectric sheet, a positive peak value detection module, a negative peak value detection module and a zero potential switching module, and each zero potential switching module comprises a first diode and a second diode; the piezoelectric energy collecting device has the advantages that when the positive peak value detecting module or the negative peak value detecting module is in a closed conducting state, LC resonance is realized between the clamping piece capacitor in the piezoelectric piece and the first inductor, the current direction passing through the first inductor is the same, the energy in the piezoelectric piece is transferred to the first inductor to form time division multiplexing of the first inductor, then the energy in the first inductor is transferred to the first energy storage capacitor and a load through the first freewheeling diode, the circuit is completely self-powered, vibration energy collection of the piezoelectric pieces is realized, and therefore the total energy collecting power of the whole system is improved.
Description
Technical Field
The invention relates to an energy acquisition circuit, in particular to a multi-piezoelectric combined energy acquisition circuit.
Background
The piezoelectric vibration energy collecting method is a method for collecting vibration energy in the environment by utilizing the piezoelectric effect of a piezoelectric material, and because the output voltage of a piezoelectric piece is an alternating current signal and general electronic equipment is powered by a direct current power supply, an interface circuit is needed between the piezoelectric piece and the electronic equipment, the conversion from the alternating current voltage to the direct current voltage is realized through the interface circuit, and the higher the conversion efficiency of the interface circuit is, the better the conversion efficiency is.
In order to improve the collection efficiency of piezoelectric vibration energy, researchers have proposed various energy collection circuits, mainly including a synchronous switch inductance technology, a self-powered synchronous charge extraction technology, an energy collection technology based on voltage-doubling rectification, some related derivative technologies, and the like; the advantage of this kind of structure is that circuit efficiency is higher, but, because these circuits only carry out energy extraction to single piezoelectric plate, but single piezoelectric plate draws energy limitedly, and peak detection switch still has great phase lag problem in these circuits, makes the energy acquisition efficiency of single piezoelectric plate promote to be restricted.
Disclosure of Invention
The invention aims to solve the technical problem of providing a multi-piezoelectric combined energy acquisition circuit with higher acquisition efficiency of piezoelectric vibration energy.
The technical scheme adopted by the invention for solving the technical problems is as follows: a multi-piezoelectric combined energy acquisition circuit comprises a plurality of piezoelectric energy acquisition modules, a first inductor, a first freewheeling diode, a first energy storage capacitor and a load, wherein each piezoelectric energy acquisition module comprises a piezoelectric sheet, a positive peak detection module, a negative peak detection module and a zero potential switching module, each zero potential switching module comprises a first diode and a second diode, the positive pole of each positive peak detection module, the negative pole of each negative peak detection module, one end of each piezoelectric sheet and the positive pole of each first diode are connected, the negative pole of each positive peak detection module, the positive pole of each negative peak detection module, the other end of each piezoelectric sheet and the positive pole of each second diode are connected, the control end of each positive peak detection module, the control end of each negative peak detection module, the positive pole of each first freewheeling diode and one end of each first inductor are connected, the negative electrode of the first freewheeling diode, the positive electrode of the first energy-storage capacitor and one end of the load are connected, and the other end of the first inductor, the negative electrode of the first energy-storage capacitor, the other end of the load, the negative electrode of the first diode and the negative electrode of the second diode are all grounded.
The positive peak detection module comprises a first PNP triode, a first NPN triode, a first capacitor, a first resistor, a third diode, a fourth diode, a first Schottky diode and a second Schottky diode, the negative peak detection module comprises a second PNP triode, a second NPN triode, a second capacitor, a second resistor, a fifth diode, a sixth diode, a third Schottky diode and a fourth Schottky diode, one end of the piezoelectric plate, the anode of the first diode, the anode of the third diode, the anode of the fourth diode, one end of the second resistor, one end of the second capacitor and the emitter of the second NPN triode are connected, and the other end of the piezoelectric plate, the anode of the second diode, one end of the first resistor, one end of the first capacitor, one end of the second capacitor, the anode of the second capacitor, the cathode of the third diode, the anode of the fourth diode, the emitter of the second NPN triode, the other end of the piezoelectric plate, the anode of the second diode, one end of the first resistor, one end of the first capacitor, an emitting electrode of the first NPN triode, an anode of the fifth diode and an anode of the sixth diode are connected, a cathode of the third diode is connected with an anode of the first Schottky diode, a cathode of the first Schottky diode is connected with an anode of the second Schottky diode, a cathode of the second Schottky diode, the other end of the first resistor and a base of the first PNP triode are connected, a cathode of the fourth diode, an emitting electrode of the first PNP triode and the other end of the first capacitor are connected, a collector of the first PNP triode is connected with a base of the first NPN triode, a cathode of the fifth diode is connected with an anode of the third Schottky diode, a cathode of the third Schottky diode is connected with an anode of the fourth Schottky diode, the negative electrode of the fourth Schottky diode, the other end of the second resistor and the base electrode of the second PNP triode are connected, the negative electrode of the sixth diode, the emitting electrode of the second PNP triode and the other end of the second capacitor are connected, the collector electrode of the second PNP triode is connected with the base electrode of the second NPN triode, and the collector electrode of the first NPN triode, the collector electrode of the second NPN triode and the anode electrode of the first freewheeling diode are connected. If the voltage on one end of the piezoelectric sheet in the piezoelectric energy acquisition module is higher than the voltage on the other end of the piezoelectric sheet, the piezoelectric energy acquisition module is in a positive half period of work, and in the positive half period, when the positive peak value detection module of the piezoelectric energy acquisition module detects that the voltages on two ends of the piezoelectric sheet reach peak values, a first NPN triode in the piezoelectric energy acquisition module is closed, so that a resonant circuit is formed by a first inductor and the piezoelectric sheet, and after 1/4 LC oscillation periods, the charges accumulated on a parasitic capacitor in the piezoelectric sheet are transferred to the first inductor, so that the conversion from electric energy to magnetic energy is completed; after the charge transfer is finished, the current on the first inductor reaches the maximum value, because the charges on the parasitic capacitor inside the piezoelectric patch are all released, the voltage at two ends of the piezoelectric patch is reduced to zero, meanwhile, the first NPN triode in the positive peak value detection module is disconnected, and the current on the first inductor flows to the first energy storage capacitor and the load through the first freewheeling diode to supply power for the load; in the same way, in the negative half period, the voltage on one end of the piezoelectric sheet in the piezoelectric energy collection module is lower than that on the other end, in the negative half period, when the negative peak value detection module detects that the voltage at the two ends of the piezoelectric patch reaches the peak value, the second NPN triode is closed, so that the first inductor and the piezoelectric plate form a resonant loop, after 1/4 LC oscillation cycles, the charges accumulated on the parasitic capacitance inside the piezoelectric plate can be transferred to the first inductor, the conversion from electric energy to magnetic energy is completed, after the charge transfer is completed, the current on the first inductor reaches the maximum value, because the charges on the parasitic capacitance in the piezoelectric patch are all released, the voltage at the two ends of the piezoelectric patch is reduced to zero, meanwhile, the negative peak value detection module disconnects the second NPN triode, and the current on the first inductor flows to the first energy storage capacitor and the load through the first freewheeling diode; because the vibration of the piezoelectric sheets of different piezoelectric energy acquisition modules has a certain phase difference, after the piezoelectric sheets of the piezoelectric energy acquisition modules finish charge extraction for a period of time, the voltage at two ends of the piezoelectric sheet in another piezoelectric energy acquisition module also reaches a peak value, the clamped capacitor in the piezoelectric sheet also generates LC resonance with the first inductor, and then the first energy storage capacitor is charged through the first fly-wheel diode; because the frequency of the piezoelectric energy collecting modules is the same, the phase of the piezoelectric energy collecting modules is different, and the LC resonance time is extremely short, the processes of piezoelectric energy extraction among the piezoelectric energy collecting modules are not interfered with each other, so that time division multiplexing of the first inductor and combined energy collection of the piezoelectric sheets are realized, the base voltage of the corresponding triode is raised by arranging the Schottky diode, the phase lag is reduced, and the whole energy collecting efficiency is effectively improved.
Compared with the prior art, the invention has the advantages that the piezoelectric energy in the environment is collected by the plurality of piezoelectric energy collecting modules together, when the voltage at two ends of the piezoelectric sheet in each piezoelectric energy collecting module reaches the peak value, if the voltage on one end of the piezoelectric sheet in the piezoelectric energy collecting module is higher than the voltage on the other end, the piezoelectric energy collecting module is in the positive half period of work, and the positive peak value detecting module is in a closed conducting state; if the voltage on one end of the piezoelectric sheet in the piezoelectric energy acquisition module is lower than the voltage on the other end, the piezoelectric energy acquisition module is in a working negative half period, the negative peak detection module is in a closed conduction state, and the zero potential switching module is arranged to realize the grounding of one end with the voltage on the two ends of the piezoelectric sheet higher, so that when the positive peak detection module or the negative peak detection module is in the closed conduction state, the chip capacitor in the piezoelectric sheet realizes LC resonance with the first inductor, the current direction passing through the first inductor is the same, the energy in the piezoelectric sheet is transferred to the first inductor to form time division multiplexing of the first inductor, the utilization rate of the first inductor is improved, then the energy in the first inductor is transferred to the first energy storage capacitor and a load through the first freewheeling diode, the circuit is completely self-powered, and the collection of the vibration energy of a plurality of piezoelectric sheets is realized, thereby promoting the total energy collection power of the whole system.
Drawings
FIG. 1 is a schematic diagram of the circuit of the present invention;
FIG. 2 is a schematic diagram of a piezoelectric energy harvesting module according to the present invention;
fig. 3 is a specific circuit diagram of the piezoelectric energy harvesting module according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
A multi-piezoelectric combined energy acquisition circuit comprises a plurality of piezoelectric energy acquisition modules U, a first inductor L, a first flywheel diode D, a first energy storage capacitor CL and a load R, wherein each piezoelectric energy acquisition module U comprises a piezoelectric sheet U1, a positive peak value detection module U2, a negative peak value detection module U3 and a zero potential switching module U4, the zero potential switching module U4 comprises a first diode D1 and a second diode D2, the anode of the positive peak value detection module U2, the cathode of the negative peak value detection module U3, one end of the piezoelectric sheet U1 and the anode of the first diode D1 are connected, the cathode of the positive peak value detection module U2, the anode of the negative peak value detection module U3, the other end of the piezoelectric sheet U1 and the anode of the second diode D2 are connected, the control end of the positive peak value detection module U2, the control end of the negative peak value detection module U3, the anode of the first flywheel diode D and one end of the first inductor L are connected, the cathode of the first freewheeling diode D, the anode of the first energy-storage capacitor CL and one end of the load R are connected, and the other end of the first inductor L, the cathode of the first energy-storage capacitor CL, the other end of the load R, the cathode of the first diode D1 and the cathode of the second diode D2 are all grounded.
The positive peak detection module U2 includes a first PNP transistor Q1, a first NPN transistor Q2, a first capacitor C1, a first resistor R1, a third diode D3, a fourth diode D4, a first schottky diode D7, and a second schottky diode D8, the negative peak detection module U3 includes a second PNP transistor Q3, a second NPN transistor Q3, a second capacitor C3, a second resistor R3, a fifth diode D3, a sixth diode D3, a third schottky diode D3, and a fourth schottky diode D3, one end of the piezoelectric sheet U3, the anode of the first diode D3, the anode of the third diode D3, the anode of the fourth diode D3, one end of the second resistor R3, one end of the second capacitor C3, and the emitter of the second transistor Q3 are connected, the other end of the piezoelectric sheet U3, the anode of the first NPN transistor Q3, the first resistor R3, the emitter of the first capacitor C3, the first NPN transistor D3, the emitter of the first resistor R3, the first NPN transistor D3, The anode of the fifth diode D5 and the anode of the sixth diode D6 are connected, the cathode of the third diode D3 is connected with the anode of the first schottky diode D7, the cathode of the first schottky diode D7 is connected with the anode of the second schottky diode D8, the cathode of the second schottky diode D8, the other end of the first resistor R1 and the base of the first PNP transistor Q1, the cathode of the fourth diode D4, the emitter of the first PNP transistor Q1 and the other end of the first capacitor C1 are connected, the collector of the first NPN transistor Q1 is connected with the base of the first NPN transistor Q2, the cathode of the fifth diode D5 is connected with the anode of the third schottky diode D9, the cathode of the third schottky diode D9 is connected with the anode of the fourth NPN transistor D10, the cathode of the fourth schottky diode D10, the cathode of the second resistor R2 and the base of the second PNP transistor Q3, the negative electrode of the sixth diode D6, the emitter of the second PNP transistor Q3, and the other end of the second capacitor C2 are connected, the collector of the second PNP transistor Q3 is connected to the base of the second NPN transistor Q4, and the collector of the first NPN transistor Q2, the collector of the second NPN transistor Q4, and the positive electrode of the first freewheeling diode D are connected.
Claims (2)
1. A multi-piezoelectric combined energy acquisition circuit is characterized by comprising a plurality of piezoelectric energy acquisition modules, a first inductor, a first freewheeling diode, a first energy storage capacitor and a load, wherein each piezoelectric energy acquisition module comprises a piezoelectric sheet, a positive peak detection module, a negative peak detection module and a zero potential switching module, each zero potential switching module comprises a first diode and a second diode, the positive electrode of each positive peak detection module, the negative electrode of each negative peak detection module, one end of each piezoelectric sheet and the positive electrode of each first diode are connected, the negative electrode of each positive peak detection module, the positive electrode of each negative peak detection module, the other end of each piezoelectric sheet and the positive electrode of each second diode are connected, and the control end of each positive peak detection module, the control end of each negative peak detection module, the control end of each second diode, the first diode, the second diode and the second diode are connected, The positive electrode of the first freewheeling diode is connected with one end of the first inductor, the negative electrode of the first freewheeling diode, the positive electrode of the first energy-storage capacitor and one end of the load are connected, and the other end of the first inductor, the negative electrode of the first energy-storage capacitor, the other end of the load, the negative electrode of the first diode and the negative electrode of the second diode are all grounded.
2. The multi-piezoelectric combined energy harvesting circuit as claimed in claim 1, wherein the positive peak detection module comprises a first PNP transistor, a first NPN transistor, a first capacitor, a first resistor, a third diode, a fourth diode, a first schottky diode, and a second schottky diode, the negative peak detection module comprises a second PNP transistor, a second NPN transistor, a second capacitor, a second resistor, a fifth diode, a sixth diode, a third schottky diode, and a fourth schottky diode, one end of the piezoelectric patch, the anode of the first diode, the anode of the third diode, the anode of the fourth diode, one end of the second resistor, one end of the second capacitor, and the emitter of the second NPN transistor are connected, and the other end of the piezoelectric patch is connected to the emitter of the second NPN transistor, The anode of the second diode, the one end of the first resistor, the one end of the first capacitor, the emitter of the first NPN triode, the anode of the fifth diode and the anode of the sixth diode are connected, the cathode of the third diode is connected to the anode of the first schottky diode, the cathode of the first schottky diode is connected to the anode of the second schottky diode, the cathode of the second schottky diode, the other end of the first resistor and the base of the first PNP triode, the cathode of the fourth diode, the emitter of the first PNP triode and the other end of the first capacitor are connected, the collector of the first PNP triode is connected to the base of the first NPN triode, and the cathode of the fifth diode is connected to the anode of the third schottky diode, the negative electrode of the third schottky diode is connected with the positive electrode of the fourth schottky diode, the negative electrode of the fourth schottky diode, the other end of the second resistor and the base electrode of the second PNP triode are connected, the negative electrode of the sixth diode, the emitter electrode of the second PNP triode and the other end of the second capacitor are connected, the collector electrode of the second PNP triode is connected with the base electrode of the second NPN triode, and the collector electrode of the first NPN triode, the collector electrode of the second NPN triode and the positive electrode of the first freewheeling diode are connected.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112072956A (en) * | 2020-08-19 | 2020-12-11 | 宁波大学 | Multi-input piezoelectric vibration energy acquisition circuit |
| CN112857559A (en) * | 2021-01-11 | 2021-05-28 | 宁波大学 | Self-powered wireless vibration monitoring node based on single-piezoelectric device |
| CN113054731A (en) * | 2021-01-06 | 2021-06-29 | 南京航空航天大学 | Machining equipment cutting flutter energy acquisition circuit for intelligent Internet of things manufacturing system |
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2020
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| US20090230924A1 (en) * | 2008-03-11 | 2009-09-17 | Adaptive Energy, Llc | Circuits for harvesting energy from piezoelectric devices |
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| CN113054731A (en) * | 2021-01-06 | 2021-06-29 | 南京航空航天大学 | Machining equipment cutting flutter energy acquisition circuit for intelligent Internet of things manufacturing system |
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| CN112857559B (en) * | 2021-01-11 | 2023-02-21 | 宁波大学 | Self-powered wireless vibration monitoring node based on single-piezoelectric device |
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