CN214959330U

CN214959330U - A Piezoelectric Self-Powered Energy Harvesting Device for Pedometer

Info

Publication number: CN214959330U
Application number: CN202121555036.8U
Authority: CN
Inventors: 高翔; 李玲; 张加宏; 李敏
Original assignee: Nanjing University of Information Science and Technology
Current assignee: Nanjing University of Information Science and Technology
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2021-11-30
Anticipated expiration: 2031-07-09

Abstract

The utility model provides a piezoelectric self-powering energy collection device used for step counting, which relates to the technical field of piezoelectric self-powering. The piezoelectric self-powered energy harvesting device includes: an insole, a PZT piezoelectric thin film sensor, a PZT piezoelectric energy harvester, an energy harvesting storage circuit, a signal conditioning circuit and a single chip arranged inside the insole; the PZT piezoelectric thin film sensor and The signal conditioning circuit is connected, the signal conditioning circuit is connected with the single-chip microcomputer, the PZT piezoelectric film sensor is connected with the PZT piezoelectric energy collector, and the PZT piezoelectric energy collector is respectively connected with the PZT piezoelectric film sensor, the signal conditioning circuit, and the single-chip microcomputer . The piezoelectric self-powered energy collection device of the utility model has the characteristics of high energy collection efficiency and no need for additional charging.

Description

Piezoelectric self-powered energy collecting device for step counting

Technical Field

The utility model relates to a piezoelectricity self-power technical field specifically relates to a piezoelectricity self-power energy collecting device for meter step.

Background

Along with the promotion of people's standard of living, people attach more and more importance to the health of self, enjoy sports such as running more and more, can know the condition of self through the condition of monitoring motion step number, and the product that is used for detecting motion step number on the market all needs to get off equipment dismantlement and charge, and the dismantlement process is loaded down with trivial details, and can't use in charging process for the use of this product is limited.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides a piezoelectricity self-powered energy collection device for meter step has realized self-powered function.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a piezoelectric self-powered energy harvesting device for step counting, comprising: the shoe pad comprises a shoe pad, a PZT piezoelectric film sensor, a PZT piezoelectric energy collector, an energy collecting and storing circuit, a signal conditioning circuit and a singlechip, wherein the PZT piezoelectric film sensor, the PZT piezoelectric energy collector, the energy collecting and storing circuit, the signal conditioning circuit and the singlechip are arranged in the shoe pad; the PZT piezoelectric thin film sensor is connected with a signal conditioning circuit, the signal conditioning circuit is connected with a single chip microcomputer, the PZT piezoelectric thin film sensor is connected with a PZT piezoelectric energy collector, and the PZT piezoelectric energy collector is respectively connected with the PZT piezoelectric thin film sensor, the signal conditioning circuit and the single chip microcomputer.

Furthermore, the type of the single chip microcomputer is MSP430, and an I/O interface of the single chip microcomputer is connected with the signal conditioning circuit.

Further, the PZT piezoelectric thin film sensor includes: the piezoelectric film comprises a PZT piezoelectric film, a polyimide film and copper electrodes, wherein the upper side and the lower side of the PZT piezoelectric film are respectively fixedly connected with the polyimide film, and the two sides of the PZT piezoelectric film are respectively connected with the copper electrodes.

Further, the PZT piezoelectric energy harvester includes: the piezoelectric device comprises a first acrylic plate, a second acrylic plate, a pressure spring, a tower spring, a mass block and a piezoelectric sheet, wherein the mass block is arranged at the center of the upper part of the piezoelectric sheet, the upper part of the piezoelectric sheet is fixedly connected with the first acrylic plate through the pressure spring, the tower spring is arranged at the center of the lower part of the piezoelectric sheet, the lower part of the tower spring is fixedly connected with the second acrylic plate, and the second acrylic plate is fixedly connected with the lower part of the piezoelectric sheet through a bolt.

Furthermore, the piezoelectric sheets are three in number, the three piezoelectric sheets are separated by hexagonal nuts, and each piezoelectric sheet is wrapped by a PVC adhesive tape.

Further, the energy harvesting storage circuit comprises: a rectifying circuit, an NMOS tube Q1, a PMOS tube Q2, a Schmidt trigger, a voltage reduction chip, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, a super capacitor, an inductor L1 and a diode, wherein the positive pole of the rectifying circuit is respectively connected with one end of the first capacitor C1, the grid of the NMOS tube Q1, one end of the first resistor R1, the VCC port of the Schmidt trigger and the source of the PMOS tube Q2, the negative pole of the rectifying circuit is grounded, the other end of the first capacitor C2 and the source of the NMOS tube Q1 are grounded, the other end of the first resistor R1 and the drain of the NMOS tube Q1 are both connected with the grid of the PMOS tube Q2, the VIN of the PMOS tube Q2, one end of the second capacitor C5, the NCC port of the Schmidt trigger and one end of the inductor L4623 are respectively connected with the NCC port of the voltage reduction chip, the GND port of the Schmidt trigger, the second capacitor C2 and the GND of the Schmidt trigger are grounded, the Y port of the Schmitt trigger is connected with the EN port of the voltage reduction chip, the other end of the inductor L1 is connected with the L end of the voltage reduction chip, the FB port of the voltage reduction chip and one end of the third resistor R3 are respectively connected with one end of the second resistor R2, the other end of the second resistor R2 is grounded, the GND port of the voltage reduction chip is grounded, the VOUT port of the voltage reduction chip, the other end of the third resistor R3 and one end of the third capacitor C3 are respectively connected with the anode of the diode, the other end of the third capacitor C3 is grounded, the cathode of the diode is connected with one end of the super capacitor, and the other end of the super capacitor is grounded.

Furthermore, the super capacitor is respectively connected with the PZT piezoelectric film sensor, the signal conditioning circuit and the I/O interface of the single chip microcomputer.

Compared with the prior art, the utility model discloses following beneficial effect has: the piezoelectric self-powered energy collecting device of the utility model converts the mechanical energy of foot motion into electric energy through the PZT piezoelectric energy collector, and stores the electric energy in the energy collecting and storing circuit after collection, so as to supply power for the PZT piezoelectric film sensor, the signal conditioning circuit and the single chip microcomputer and realize the self-powered function; meanwhile, the piezoelectric self-powered energy collecting device collects the foot movement signals through the PZT piezoelectric film sensor, and feeds back the movement steps through single motor processing. The utility model discloses a piezoelectricity self-power energy harvesting device has energy collection efficiency height, need not the characteristics of extra charging.

Drawings

Fig. 1 is a schematic structural diagram of a piezoelectric self-powered energy collecting device for step counting according to the present invention;

FIG. 2 is a schematic structural diagram of a PZT piezoelectric energy collector according to the present invention;

fig. 3 is a circuit diagram of the energy harvesting and storing circuit of the present invention;

fig. 4 is a schematic diagram of the voltage generated by the piezoelectric self-powered energy harvesting device for step counting according to the present invention;

the system comprises a 1-PZT piezoelectric film sensor, a 2-PZT piezoelectric energy collector, a 3-single chip microcomputer, a 4-insole, a 5-energy collecting and storing circuit, a 6-signal conditioning circuit, a 21-first acrylic plate, a 22-second acrylic plate, a 23-piezoelectric sheet, a 24-pressure spring, a 25-tower spring and a 26-mass block.

Detailed Description

The technical solution of the present invention is further explained below with reference to the accompanying drawings.

Fig. 1 shows the present invention relates to a piezoelectric self-powered energy collecting device for step counting, which includes: the shoe pad 4, and the PZT piezoelectric thin film sensor 1, the PZT piezoelectric energy collector 2, the energy collection and storage circuit 5, the signal conditioning circuit 6 and the singlechip 3 which are arranged in the shoe pad 4; the PZT piezoelectric thin film sensor 1 is connected with the signal conditioning circuit 6, the signal conditioning circuit 6 is connected with the single chip microcomputer 3, the PZT piezoelectric thin film sensor 1 is connected with the PZT piezoelectric energy collector 2, and the PZT piezoelectric energy collector 2 is respectively connected with the PZT piezoelectric thin film sensor 1, the signal conditioning circuit 6 and the single chip microcomputer 3. The utility model provides a PZT piezoelectric energy collector 2 can be when the human motion, and the mechanical signal conversion who oppresses PZT piezoelectric energy collector 2 with the foot is the signal of telecommunication, with signal of telecommunication storage to energy collection storage circuit 5 in to give PZT piezoelectric film sensor 1,

signal conditioning circuit

6, 3 power supplies of singlechip respectively through energy storage circuit 5. The utility model provides a PZT piezoelectric film sensor 1 collects human motion information to after sending human motion signal to signal conditioning circuit 6, send for singlechip 3 again, the utility model discloses singlechip 3's model is MSP430, and singlechip 3's IO interface and signal conditioning circuit are connected, can feed back the step number of motion in real time.

The utility model provides a PZT piezoelectric film sensor 1 includes: the piezoelectric film comprises a PZT piezoelectric film, a polyimide film and a copper electrode, wherein the upper side and the lower side of the PZT piezoelectric film are respectively fixedly connected with the polyimide film, and the two sides of the PZT piezoelectric film are respectively connected with the copper electrode, so that the current output is increased.

Fig. 2 is a schematic structural diagram of a PZT piezoelectric energy collector of the present invention, where the PZT piezoelectric energy collector 2 includes: the piezoelectric device comprises a first acrylic plate 21, a second acrylic plate 22, a pressure spring 24, a tower spring 25, a mass block 26 and a piezoelectric sheet 23, wherein the mass block 26 is arranged at the center of the upper portion of the piezoelectric sheet 23 and used for enhancing the power generation performance of the piezoelectric sheet 23, the upper portion of the piezoelectric sheet 23 is fixedly connected with the first acrylic plate 21 through the pressure spring 24, the pressure spring 24 is used for buffering and amplifying the deformation of the piezoelectric sheet 23, the tower spring 25 is arranged at the center of the lower portion of the piezoelectric sheet 23, the lower portion of the tower spring 25 is fixedly connected with the second acrylic plate 22 through epoxy resin glue, and the lower portion of the second acrylic plate 22 is fixedly connected with the lower portion of the piezoelectric sheet 23 through bolts. The utility model provides a piezoelectric patches 23 is total three, separates through hexagon nut between the three piezoelectric patches, and every piezoelectric patch all wraps up high tenacity PVC sticky tape for prevent piezoceramics fracture and increase piezoelectric patches 23's deformability's maximum range.

Fig. 3 is a circuit diagram of the energy harvesting and storing circuit of the present invention, and the energy harvesting and storing circuit 5 includes: the circuit comprises a rectifying circuit, an NMOS tube Q1, a PMOS tube Q2, a Schmidt trigger, a voltage reduction chip, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, a super capacitor, an inductor L1 and a diode, wherein the rectifying circuit comprises a power supply, a power supply and a power supplyThe positive electrode of the rectifying circuit is respectively connected with one end of a first capacitor C1, the grid electrode of an NMOS tube Q1, one end of a first resistor R1, the VCC port of a Schmitt trigger and the source electrode of a PMOS tube Q2, the negative electrode of the rectifying circuit is grounded, the other end of the first capacitor C2 and the source electrode of an NMOS tube Q1 are grounded, the other end of a first resistor R1 and the drain electrode of the NMOS tube Q1 are both connected with the grid electrode of the PMOS tube Q2, the grid electrode of the PMOS tube Q2, one end of a second capacitor C2, the NCC port of the Schmitt trigger and one end of an inductor L1 are respectively connected with the VIN port of a buck chip, the other end of the second capacitor C2 is grounded, the GND port of the Schmitt trigger is grounded, the Y port of the Schmitt trigger is connected with the EN port of the buck chip, the other end of the inductor L1 is connected with the L port of the buck chip, the FB port of the buck chip and one end of the third resistor R3 are respectively connected with the second resistor R2, the other end of the second resistor R2 is grounded, the GND port of the voltage reduction chip is grounded, the VOUT port of the voltage reduction chip, the other end of the third resistor R3 and one end of the third capacitor C3 are respectively connected with the anode of the diode, the other end of the third capacitor C3 is grounded, the cathode of the diode is connected with one end of the super capacitor, and the other end of the super capacitor is grounded. The utility model provides an energy collection memory circuit 5 is through NMOS pipe Q1, PMOS pipe Q2 pin down each other to control PMOS pipe Q2's degree of opening, at first guarantee that first electric capacity C1 is preferred to be charged, and provide operating voltage for Schmidt trigger through first electric capacity C1, voltage when in first electric capacity C1 reaches and opens threshold value V1_th1The second capacitor C2 is charged when the voltage in the second capacitor C2 rises to the starting threshold V of the Schmitt trigger_th2During the process, the Schmitt trigger is used as a switch, so that the voltage reduction chip starts to work, and the output voltage is supplied to the detection system to work. Through the coordination work between the first capacitor C1 and the second capacitor C2, the electric energy collected by the PZT piezoelectric energy collector 2 can be continuously and stably charged into the super capacitor, the problem of loss of most electric quantity directly charged into the super capacitor is avoided, and the problem that the super capacitor cannot be continuously charged when reaching a certain lower threshold value is also solved. The utility model provides a super capacitor respectively with PZT piezoelectric film sensor 1, signal conditioning circuit 6, monolithicThe I/O interface of the machine 3 is connected, and power is supplied to the PZT piezoelectric film sensor 1, the signal conditioning circuit 6 and the singlechip 3 through the super capacitor.

Fig. 4 is a schematic diagram of the voltage generated by the piezoelectric self-powered energy collecting device for step counting according to the present invention, for example, fig. 4 is a voltage diagram generated when the human body movement frequency is 2Hz, the voltage generated by the energy collecting device is an ac voltage, and the output voltage is higher.

Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, a plurality of modifications and decorations without departing from the principle of the present invention should be considered as the protection scope of the present invention.

Claims

1. A piezoelectric self-powered energy harvesting device for step counting, characterized in that it comprises: an insole (4) and a PZT piezoelectric film sensor (1) arranged inside the insole (4), PZT piezoelectric energy collection device (2), energy collection and storage circuit (5), signal conditioning circuit (6) and single chip microcomputer (3); the PZT piezoelectric thin film sensor (1) is connected to the signal conditioning circuit (6), and the signal conditioning circuit (6) Connected to the single chip microcomputer (3), the PZT piezoelectric thin film sensor (1) is connected to the PZT piezoelectric energy harvester (2), and the PZT piezoelectric energy harvester (2) is respectively connected to the PZT piezoelectric thin film sensor (1) , The signal conditioning circuit (6), and the single-chip microcomputer (3) are connected.

2. The piezoelectric self-powered energy harvesting device for step counting according to claim 1, wherein the type of the single chip microcomputer (3) is MSP430, and the I/O interface and signal conditioning of the single chip computer (3) Circuit (6) is connected.

3. The piezoelectric self-powered energy harvesting device for step counting according to claim 1, wherein the PZT piezoelectric film sensor (1) comprises: a PZT piezoelectric film, a polyimide film, and a copper electrode The upper and lower sides of the PZT piezoelectric film are respectively fixedly connected with the polyimide film, and the two sides of the PZT piezoelectric film are respectively connected with copper electrodes.

4. The piezoelectric self-powered energy harvester for step counting according to claim 1, wherein the PZT piezoelectric energy harvester (2) comprises: a first acrylic plate (21), a second acrylic plate (22), a compression spring (24), a tower spring (25), a mass block (26), and a piezoelectric sheet (23). The upper part of the piezoelectric sheet (23) is fixedly connected with the first acrylic plate (21) through a compression spring (24), and a tower spring (25) is provided at the center of the lower part of the piezoelectric sheet (23). 25) The lower part is fixedly connected with the second acrylic plate (22), and the second acrylic plate (22) is fixedly connected with the lower part of the piezoelectric sheet (23) by bolts.

5. The piezoelectric self-powered energy harvesting device for step counting according to claim 4, characterized in that there are three piezoelectric sheets (23) in total, and the three piezoelectric sheets are separated by a hexagonal nut. Piezoelectric sheets are wrapped with PVC tape.

6. The piezoelectric self-powered energy harvesting device for step counting according to claim 1, wherein the energy harvesting storage circuit (5) comprises: a rectifier circuit, an NMOS transistor Q1, a PMOS transistor Q2, a Schmidt transistor A trigger, a step-down chip, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, a super capacitor, an inductor L1, and a diode. The positive electrode is respectively connected to one end of the first capacitor C1, the gate of the NMOS transistor Q1, one end of the first resistor R1, the VCC port of the Schmitt trigger, and the source of the PMOS transistor Q2, and the negative electrode of the rectifier circuit is grounded, so The other end of the first capacitor C2 and the source of the NMOS transistor Q1 are grounded, the other end of the first resistor R1 and the drain of the NMOS transistor Q1 are connected to the gate of the PMOS transistor Q2, and the gate of the PMOS transistor Q2 is connected to the ground. pole, one end of the second capacitor C2, the NCC port of the Schmitt trigger, and one end of the inductor L1 are respectively connected to the VIN port of the step-down chip, the other end of the second capacitor C2 is grounded, and the Schmitt trigger The GND port is grounded, the Y port of the Schmitt trigger is connected to the EN port of the step-down chip, the other end of the inductor L1 is connected to the L end of the step-down chip, the FB port of the step-down chip, the first One end of the third resistor R3 is respectively connected to one end of the second resistor R2, the other end of the second resistor R2 is grounded, the GND port of the step-down chip is grounded, the VOUT port of the step-down chip, the other end of the third resistor R3 One end and one end of the third capacitor C3 are respectively connected to the anode of the diode, the other end of the third capacitor C3 is grounded, the cathode of the diode is connected to one end of the supercapacitor, and the other end of the supercapacitor is grounded.

7. The piezoelectric self-powered energy harvesting device for pedometer according to claim 6, characterized in that the supercapacitor is respectively connected with the PZT piezoelectric thin film sensor (1), the signal conditioning circuit (6), the single-chip microcomputer (3). ) I/O interface connection.