CN108233766B

CN108233766B - Composite energy acquisition circuit

Info

Publication number: CN108233766B
Application number: CN201810082606.2A
Authority: CN
Inventors: 夏银水; 王修登; 施阁; 叶益迭; 钱利波; 夏桦康
Original assignee: Ningbo University
Current assignee: Ningbo University
Priority date: 2018-01-29
Filing date: 2018-01-29
Publication date: 2023-10-03
Anticipated expiration: 2038-01-29
Also published as: CN108233766A

Abstract

The invention discloses a composite energy acquisition circuit which is characterized by comprising a thermoelectric generation sheet, a piezoelectric sheet, a positive peak value detection module, a negative peak value detection module, a zero potential switching module, a first inductor, a first diode, a first energy storage capacitor, a second energy storage capacitor and a load, wherein the thermoelectric generation sheet is connected with the piezoelectric sheet; the piezoelectric patch has the advantages that when the voltage at two ends of the piezoelectric patch reaches a peak value, the switching tube is conducted through the peak value detection module, so that the circuit generates LC oscillation, the charge on the parasitic capacitance in the piezoelectric patch and the charge accumulated on the first energy storage capacitance are transferred to the first inductor, the first NMOS tube is immediately disconnected through the positive peak value detection module or the third NMOS tube is immediately disconnected through the negative peak value detection module at the moment that the current on the first inductor reaches the maximum value, the energy stored on the first inductor is fully flowed to the load and the second energy storage capacitance through the first diode, the whole circuit is completely self-powered, and the energy collection efficiency is high.

Description

Composite energy acquisition circuit

Technical Field

The invention relates to an energy acquisition circuit, in particular to a composite energy acquisition circuit.

Background

The piezoelectric vibration energy collection is a method for collecting vibration energy in the environment by utilizing the piezoelectric effect of piezoelectric materials, because the output voltage of a piezoelectric sheet 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 sheet and the electronic equipment, the conversion from alternating current voltage to direct current voltage is realized through the interface circuit, the higher the conversion efficiency of the interface circuit is, the better the conversion efficiency of the interface circuit is, the first proposed interface circuit is a standard energy capture circuit, and the interface circuit consists of a diode bridge rectifier circuit and a filter capacitor.

The temperature difference power generation piece can collect energy by utilizing the temperature difference in the environment, but the temperature difference in the environment is smaller in general, the open-circuit voltage of the temperature difference power generation piece is very low, and factors such as the efficiency of an energy collection circuit between the power generation piece and a load increase the difficulty of utilizing the temperature difference energy; at present, the thermoelectric energy collection circuit is mainly divided into a capacitive charge pump circuit and an inductive boost circuit, and the charge pump circuit can boost the voltage of a thermoelectric generation sheet, but the charge pump structure has weak driving capability, and the low-voltage charge pump circuit has lower efficiency; although the inductance boost circuit has high efficiency and strong capacity of driving a load, the open-circuit voltage of a general thermoelectric generation sheet is lower than the threshold voltage of a switching tube, so that the boost structure often needs an external power supply, and the boost circuit cannot be automatically started when the external power supply is not connected, thereby increasing the use cost.

In order to obtain more energy from the environment and improve the total power of the environmental energy collection, researchers have proposed the idea of multi-source energy collection, namely, collecting energy in various forms such as vibration energy, heat energy, microwave radiation and the like in the environment, but because signals generated by different energy sources are completely different, different signals cannot be directly coupled together, a common multi-source energy collection system generally adopts a comparison method, namely, one energy with stronger energy is collected by comparing the sizes of two energy densities, so that the other energy cannot be collected, and the overall collection efficiency is affected.

Disclosure of Invention

The invention aims to provide a composite energy acquisition circuit capable of simultaneously acquiring piezoelectric vibration energy and thermoelectric energy.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a compound energy acquisition circuit, includes thermoelectric generation piece, piezoelectric plate, positive peak detection module, negative peak detection module, zero potential switching module, first inductance, first diode, first energy storage capacitor, second energy storage capacitor and load, the 1 st pin of thermoelectric generation piece, the one end of first energy storage capacitor and the one end of first inductance connect, the other end of first inductance the input of positive peak detection module, negative peak detection module's input and the anodal of first diode connect, the negative pole of first diode the positive pole of second energy storage capacitor with the one end of load connect, positive peak detection module's positive pole the negative pole of negative peak detection module the 1 st pin of piezoelectric plate and the first input of zero potential switching module connect, positive peak detection module's positive pole the negative pole the second pin of negative peak detection module and the second pin of piezoelectric plate and the second input of zero potential switching module's the other end the equal potential of zero potential switching module's the input of second pin of piezoelectric plate, the equal potential of second energy storage module.

The positive peak detection module comprises a first PNP, a first capacitor, a first NMOS, a second NMOS, a fourth diode and a fifth diode, the negative peak detection module comprises a second PNP, a second capacitor, a third NMOS, a fourth NMOS, a sixth diode and a seventh diode, the zero potential switching module comprises a second diode and a third diode, the first pin of the piezoelectric plate, the negative electrode of the seventh diode, the source electrode of the fourth NMOS, the positive electrode of the second diode, the positive electrode of the fourth diode, the negative electrode of the fourth diode, the emitter electrode of the fourth diode and the base electrode of the first PNP diode are connected, one end of the fourth diode, one end of the first capacitor and the emitter electrode of the first PNP diode are connected, the other end of the first capacitor is connected with the drain electrode of the second NMOS, the first NMOS of the first PNP is connected with the first grid electrode of the first PNP, the negative electrode of the fourth NMOS is connected with the positive electrode of the fourth NMOS, one end of the fourth diode, the positive electrode of the fourth diode, the negative electrode of the fourth diode is connected with the drain electrode of the fourth NMOS, the fourth diode and the negative electrode of the fourth diode is connected with the drain electrode of the fourth PNP, one end of the fourth diode is connected with the fourth diode, the negative electrode of the fourth diode is connected with the fourth PNP, the source electrode of the third NMOS tube is connected with the positive electrode of the seventh diode, and the negative electrode of the second diode and the negative electrode of the third diode are grounded.

Compared with the prior art, the invention has the advantages that the first inductor is connected in series with the parasitic capacitance in the piezoelectric sheet and the first energy storage capacitor charged by the thermoelectric generation sheet, when the voltage at two ends of the piezoelectric sheet reaches the peak value, the peak detection module is used for conducting the switching tube to enable the circuit to generate LC oscillation, so that the charge on the parasitic capacitance in the piezoelectric sheet and the charge accumulated on the first energy storage capacitor are transferred to the first inductor, the first NMOS tube is immediately disconnected through the positive peak detection module or the third NMOS tube is immediately disconnected through the negative peak detection module at the moment that the current on the first inductor reaches the maximum value, the energy stored on the first inductor is completely self-started and self-powered through the first diode to flow to the load and the second energy storage capacitor, and the thermoelectric energy and the piezoelectric vibration energy in the environment can be continuously collected, so that the energy collection efficiency of the whole circuit is improved, and the use cost is reduced.

Drawings

FIG. 1 is a schematic circuit diagram of the present invention;

fig. 2 is a circuit configuration diagram of the present invention.

Detailed Description

The invention is described in further detail below with reference to the embodiments of the drawings.

The utility model provides a compound energy acquisition circuit, including thermoelectric generation piece U1, piezoelectric plate U2, positive peak detection module U3, negative peak detection module U4, zero potential switching module U5, first inductance L1, first diode D1, first energy storage capacitor Ct, second energy storage capacitor Cr and load RL, the 1 st pin of thermoelectric generation piece U1, the one end of first energy storage capacitor Ct and the one end of first inductance L1 are connected, the other end of first inductance L1, the input of positive peak detection module U3, the input of negative peak detection module U4 and the positive pole of first diode D1 are connected, the positive pole of first diode D1, the positive pole of second energy storage capacitor Cr and the one end of load RL are connected, the positive pole of positive peak detection module U3, the negative pole of negative peak detection module U4, the 1 st pin of piezoelectric plate U2 and the first input of zero potential switching module U5, the positive pole of negative peak detection module U4, the second pin of piezoelectric plate U2 and the second energy storage module U5 connect the first electric potential of zero peak detection module U5, the equal earth potential of the other end of load RL is connected.

The positive peak detection module U3 comprises a first PNP tube B1, a first capacitor C1, a first NMOS tube N1, a second NMOS tube N2, a fourth diode D4 and a fifth diode D5, the negative peak detection module U4 comprises a second PNP tube B2, a second capacitor C2, a third NMOS tube N3, a fourth NMOS tube N4, a sixth diode D6 and a seventh diode D7, the zero potential switching module U5 comprises a second diode D2 and a third diode D3, the 1 st pin of the piezoelectric sheet U2, the negative electrode of the seventh diode D7, the source electrode of the fourth NMOS tube N4, the positive electrode of the second diode D2, the grid electrode of the second NMOS tube N2, the positive electrode of the fourth diode D4 and the base electrode of the first PNP tube B1 are connected, the negative electrode of the fourth diode D4, one end of the first capacitor C1 and the emitter electrode of the first PNP tube B1 are connected, the other end of the first capacitor C1 is connected with the drain electrode of the second NMOS tube N2, the first PNP tube B1 is connected with the collector electrode of the first NMOS tube N1, the drain electrode of the first NMOS tube N1, the drain electrode of the third NMOS tube N3, one end of the first inductor L1 and the positive electrode of the first diode D1 are connected, the source electrode of the first NMOS tube N1 is connected with the positive electrode of the fifth diode D5, the negative electrode of the fifth diode D5, the source electrode of the second NMOS tube N2, the positive electrode of the third diode D3, the 2 nd pin of the piezoelectric sheet U2, the grid electrode of the fourth NMOS tube N4, the positive electrode of the sixth diode D6 and the base electrode of the second PNP tube B2 are connected, the drain electrode of the fourth NMOS tube N4 is connected with one end of the second capacitor C2, the other end of the second capacitor C2, the emitter electrode of the second PNP tube B2 and the negative electrode of the sixth diode D6 are connected, the collector electrode of the second PNP tube B2 is connected with the grid electrode of the third NMOS tube N3, the source electrode of the third NMOS tube N3 is connected with the positive electrode of the seventh diode D7, and the negative electrode of the second diode D2 is grounded.

Defining a time period when the voltage on the 1 st pin of the piezoelectric sheet U2 is higher than the voltage on the 2 nd pin as a positive half period of the circuit, wherein the voltage on the 1 st pin of the piezoelectric sheet U2 is higher than the voltage on the 2 nd pin in the positive half period, the temperature difference generating sheet U1 charges the first energy storage capacitor Ct in the positive half period, when the positive peak detection module U3 detects that the voltage at two ends of the piezoelectric sheet U2 reaches a peak value, the first NMOS tube N1 is closed, so that the first energy storage capacitor Ct, the first inductor L1 and the piezoelectric sheet U2 form an LC oscillating circuit, the charges accumulated on the first energy storage capacitor Ct and the parasitic capacitance inside the piezoelectric sheet U2 are transferred to the first inductor L1 through 1/4 LC oscillating periods, after the charge transfer is completed, the current on the first inductor L1 reaches the maximum value, and the charges on the parasitic capacitance inside the piezoelectric sheet U2 are completely released, the voltage at two ends of the piezoelectric sheet U2 is reduced to zero, and at the same time, the positive peak detection module U3 opens the first NMOS tube N1, the first energy storage capacitor L1 and the second energy storage capacitor RL is completely converted to the magnetic energy through the first diode RL and the second capacitor D; in the same way, when the voltage on the 1 st pin of the piezoelectric sheet U2 is lower than the voltage on the 2 nd pin, the voltage on the first pin is defined as a negative half cycle, in the negative half cycle, the thermoelectric generation sheet U1 charges the first energy storage capacitor Ct, when the negative peak detection circuit U4 detects that the voltage at two ends of the piezoelectric sheet U2 reaches a peak value, the third NMOS tube N3 is closed, thereby the first energy storage capacitor Ct, the first inductor L1 and the piezoelectric sheet U2 form a loop, through 1/4 LC oscillation cycles, charges accumulated on the first energy storage capacitor Ct and the parasitic capacitance inside the piezoelectric sheet U2 are transferred to the first inductor L1, meanwhile, conversion from electric energy to magnetic energy is completed, after the charge transfer is completed, the current on the first inductor L1 reaches the maximum value, and the voltage at two ends of the piezoelectric sheet U2 is reduced to zero due to the fact that the negative peak detection circuit U4 breaks the third NMOS tube N3, the current on the first inductor L1 flows to the second energy storage capacitor Cr and the load through the first diode D1, the voltage is switched to the second energy storage capacitor RL, and the other end of the thermoelectric module is switched to the voltage at the opposite end of the first end, and the thermoelectric module is switched to the voltage at the opposite end of the first end and the thermoelectric module is at the high voltage end, and the thermoelectric module is at the end of the high voltage end is connected to the high voltage end.

Claims

1. The composite energy acquisition circuit is characterized by comprising a thermoelectric generation sheet, a piezoelectric sheet, a positive peak detection module, a negative peak detection module, a zero potential switching module, a first inductor, a first diode, a first energy storage capacitor, a second energy storage capacitor and a load, wherein a 1 st pin of the thermoelectric generation sheet, one end of the first energy storage capacitor and one end of the first inductor are connected, the other end of the first inductor, the input end of the positive peak detection module, the input end of the negative peak detection module and the positive electrode of the first diode are connected, the negative electrode of the first diode, the positive electrode of the second energy storage capacitor and one end of the load are connected, the positive electrode of the positive peak detection module, the negative electrode of the negative peak detection module, the 1 st pin of the piezoelectric sheet and the first input end of the zero potential switching module are connected, the negative pole of the positive peak value detection module, the positive pole of the negative peak value detection module, the 2 nd pin of the piezoelectric film and the second input end of the zero potential switching module are connected, the 2 nd pin of the thermoelectric generation film, the other end of the first energy storage capacitor, the negative pole of the second energy storage capacitor, the other end of the load and the grounding end of the zero potential switching module are grounded, the positive peak value detection module comprises a first PNP tube, a first capacitor, a first NMOS tube, a second NMOS tube, a fourth diode and a fifth diode, the negative peak value detection module comprises a second PNP tube, a second capacitor, a third NMOS tube, a fourth NMOS tube, a sixth diode and a seventh diode, the zero potential switching module comprises a second diode and a third diode, the 1 st pin of the piezoelectric sheet, the cathode of the seventh diode, the source of the fourth NMOS tube, the anode of the second diode, the grid of the second NMOS tube, the anode of the fourth diode and the base of the first PNP tube are connected, the cathode of the fourth diode, one end of the first capacitor and the emitter of the first PNP tube are connected, the other end of the first capacitor is connected with the drain of the second NMOS tube, the collector of the first PNP tube is connected with the grid of the first NMOS tube, the drain of the third NMOS tube, one end of the first inductor and the anode of the first diode are connected, the source of the first NMOS tube is connected with the anode of the fifth diode, the cathode of the fifth diode, the source of the second NMOS tube, the anode of the third diode, the 2 nd pin of the third NMOS tube, the grid of the fourth NMOS tube, the anode of the sixth diode and the base of the second PNP tube are all connected, the drain of the fourth NMOS tube is connected with one end of the second capacitor, the other end of the second capacitor, the emitter of the second PNP tube and the cathode of the sixth diode are connected, the collector of the second PNP tube is connected with the grid of the third NMOS tube, the source of the third NMOS tube is connected with the anode of the seventh diode, the cathode of the second diode is grounded with the anode of the third diode, the voltage on the 1 st pin of the piezoelectric sheet U2 is higher than the voltage on the 2 nd pin in the positive half period, the temperature difference generating sheet U1 charges the first energy storage capacitor Ct in the positive half period, when the positive peak detection module U3 detects that the voltage at two ends of the piezoelectric sheet U2 reaches a peak value, the first NMOS tube N1 is closed, so that the first energy storage capacitor Ct, the first inductor L1 and the piezoelectric sheet U2 form an LC oscillating circuit, and after 1/4 LC oscillating periods, charges accumulated on the first energy storage capacitor Ct and parasitic capacitance inside the piezoelectric sheet U2 are transferred to the first inductor L1, and the conversion from electric energy to magnetic energy is completed.