阅读说明：本技术 一种基于双压电能收集器的能量提取接口电路 (Energy extraction interface circuit based on double-voltage electric energy collector ) 是由 黄海鸥 胡小江 梁丕树 于 2021-08-23 设计创作，主要内容包括：本发明提出一种基于双压电能收集器的能量提取接口电路,包括第一压电能量收集模块、第二压电能量收集模块和电能中转模块,第一压电能量收集模块和第二压电能量收集模块分别与电能中转模块电连接；本基于双压电能收集器的能量提取接口电路将其分成了两个阶段来进行,第一个阶段采用同步开关技术,第二个阶段通过电感L1续流来实现压电能量收集器PEH2两端的电压或压电能量收集器PEH1两端的电压的预偏置和电感L1的磁能所产生的电能转移到储能电容CS中；本发明的适用负载阻值范围远远优于全桥整流器(FBR)的适用负载阻值范围,优于SECE电路的适用负载阻值范围。(The invention provides an energy extraction interface circuit based on a double-voltage electric energy collector, which comprises a first piezoelectric energy collection module, a second piezoelectric energy collection module and an electric energy transfer module, wherein the first piezoelectric energy collection module and the second piezoelectric energy collection module are respectively and electrically connected with the electric energy transfer module; the energy extraction interface circuit based on the double-voltage electric energy collector is divided into two stages to be carried out, the first stage adopts a synchronous switching technology, and the second stage realizes pre-biasing of voltage at two ends of a piezoelectric energy collector PEH2 or voltage at two ends of the piezoelectric energy collector PEH1 and electric energy generated by magnetic energy of an inductor L1 to be transferred into an energy storage capacitor CS through follow current of the inductor L1; the applicable load resistance range of the invention is far superior to that of a Full Bridge Rectifier (FBR) and that of an SECE circuit.)

1. An energy extraction interface circuit based on a double-voltage electric energy collector is characterized by comprising a first piezoelectric energy collection module, a second piezoelectric energy collection module and an electric energy transfer module, wherein the first piezoelectric energy collection module and the second piezoelectric energy collection module are respectively and electrically connected with the electric energy transfer module, the electric energy transfer module comprises an electronic switch S9, an electronic switch S10, an electronic switch S11, a freewheeling diode D1, a freewheeling diode D2, a freewheeling diode D3, an inductor L1, a capacitor CS and a load resistor RL, one end of the electronic switch S9 is respectively and electrically connected with one end of the first piezoelectric energy collection module and one end of the freewheeling diode D1, the other end of the electronic switch S9 is respectively and electrically connected with one end of the electronic switch S10, one end of the freewheeling diode D3 and one end of the inductor L1, and the other end of the inductor L1 is respectively and electrically connected with the other end of the freewheeling diode D1, One end of the freewheeling diode D2 and one end of the electronic switch S11 are electrically connected, the other end of the freewheeling diode D3 is electrically connected to one end of the capacitor CS and one end of the load resistor RL respectively and grounded, the other end of the electronic switch S11 is electrically connected to the other end of the first piezoelectric energy collection module, the other end of the capacitor CS, the other end of the load resistor RL and one end of the second piezoelectric energy collection module respectively, and the other end of the freewheeling diode D2 is electrically connected to the other end of the electronic switch S10 and the other end of the second piezoelectric energy collection module respectively.

2. The dual voltage power harvester based energy extraction interface circuit of claim 1, wherein the first piezoelectric energy harvesting module comprises a piezoelectric energy harvester PEH1, an electronic switch S1, an electronic switch S2, an electronic switch S3 and an electronic switch S4, one end of the piezoelectric energy harvester PEH1 is electrically connected to one end of the electronic switch S1 and one end of the electronic switch S4, the other end of the electronic switch S1 is electrically connected to one end of the electronic switch S2 and one end of the power transfer module, the other end of the electronic switch S2 is electrically connected to the other end of the piezoelectric energy harvester PEH1 and one end of the electronic switch S3, and the other end of the electronic switch S3 is electrically connected to the other end of the electronic switch S4 and the other end of the power transfer module.

3. The dual voltage power harvester based energy extraction interface circuit of claim 1, wherein the second piezoelectric energy harvesting module comprises a piezoelectric energy harvester PEH2, an electronic switch S5, an electronic switch S6, an electronic switch S7 and an electronic switch S8, one end of the piezoelectric energy harvester PEH2 is electrically connected to one end of the electronic switch S5 and one end of the electronic switch S8, the other end of the electronic switch S5 is electrically connected to one end of the electronic switch S6 and one end of the power transfer module, the other end of the electronic switch S6 is electrically connected to the other end of the piezoelectric energy harvester PEH2 and one end of the electronic switch S7, and the other end of the electronic switch S7 is electrically connected to the other end of the electronic switch S8 and the other end of the power transfer module.

Technical Field

The invention relates to the technical field of electric energy collecting circuits, in particular to an energy extraction interface circuit based on a double-voltage electric energy collector.

Background

Piezoelectric energy collectors (PEHs) exhibit great potential in driving low-power-consumption electronic devices due to their advantages of high power density, easy integration, etc., and PEHs are deformed along with external vibration during operation, thereby generating alternating current. Therefore, a rectifying interface circuit capable of converting the ac power output by the PEH into dc power available to the load is indispensable. The skillful design of the interface circuit can greatly improve the capability of extracting charges from the PEH. In the last two decades, synchronous switching techniques (or non-linear conversion enhancement techniques) have been widely applied to PEH interface circuits, such as the well-known SSHI and SECE circuits, and their extension circuits, sscdi, DSSH, PSECE, and so on. But these interface circuits are basically directed to a single PEH for energy extraction.

The configuration of dual PEHs may result in stronger power output, wider operating frequency, and higher reliability in the face of complex and diverse environments. Therefore, more and more researchers are beginning to explore the relevant. However, at present, the research on the interface circuit capable of simultaneously extracting energy from two PEHs is very rare, and the mainstream scheme reported in the existing literature is to perform multi-input extension on the most basic Full Bridge Rectifier (FBR) and SECE circuits.

The Full Bridge Rectifier (FBR) is designed by using a PEH corresponding to an FBR, and although the interface circuit is simple, the conversion efficiency is low, and the magnitude of the output power is greatly influenced by the load.

The inductance-sharing dual-input SECE circuit can improve conversion efficiency and realize load-independent characteristics, but the improvement of output power is still limited to four times compared with an FBR circuit. How to further improve the conversion efficiency of the interface circuit aiming at the double PEH and simultaneously realize a wider range of applicable load resistance value has great research significance.

For this reason, it is necessary to provide an energy extraction interface circuit based on a dual voltage power collector to solve the above problems.

Disclosure of Invention

In order to solve the above problems, the present invention provides an energy extraction interface circuit based on dual voltage electrical energy collectors to solve the above problems.

The invention is realized by the following technical scheme:

the invention provides an energy extraction interface circuit based on a double-voltage electric energy collector, which comprises a first piezoelectric energy collection module, a second piezoelectric energy collection module and an electric energy transfer module, wherein the first piezoelectric energy collection module and the second piezoelectric energy collection module are respectively and electrically connected with the electric energy transfer module, the electric energy transfer module comprises an electronic switch S9, an electronic switch S10, an electronic switch S11, a freewheeling diode D1, a freewheeling diode D2, a freewheeling diode D3, an inductor L1, a capacitor CS and a load resistor RL, one end of the electronic switch S9 is respectively and electrically connected with one end of the first piezoelectric energy collection module and one end of the freewheeling diode D1, the other end of the electronic switch S9 is respectively and electrically connected with one end of the electronic switch S10, one end of the freewheeling diode D3 and one end of the inductor L1, and the other end of the inductor L1 is respectively and electrically connected with the other end of the freewheeling diode D1, One end of the freewheeling diode D2 and one end of the electronic switch S11 are electrically connected, the other end of the freewheeling diode D3 is electrically connected to one end of the capacitor CS and one end of the load resistor RL respectively and grounded, the other end of the electronic switch S11 is electrically connected to the other end of the first piezoelectric energy collection module, the other end of the capacitor CS, the other end of the load resistor RL and one end of the second piezoelectric energy collection module respectively, and the other end of the freewheeling diode D2 is electrically connected to the other end of the electronic switch S10 and the other end of the second piezoelectric energy collection module respectively.

Further, the first piezoelectric energy collecting module includes a piezoelectric energy collector PEH1, an electronic switch S1, an electronic switch S2, an electronic switch S3 and an electronic switch S4, one end of the piezoelectric energy collector PEH1 is electrically connected to one end of the electronic switch S1 and one end of the electronic switch S4, the other end of the electronic switch S1 is electrically connected to one end of the electronic switch S2 and one end of the electric energy transfer module, the other end of the electronic switch S2 is electrically connected to the other end of the piezoelectric energy collector PEH1 and one end of the electronic switch S3, and the other end of the electronic switch S3 is electrically connected to the other end of the electronic switch S4 and the other end of the electric energy transfer module.

Further, the second piezoelectric energy collecting module includes a piezoelectric energy collector PEH2, an electronic switch S5, an electronic switch S6, an electronic switch S7 and an electronic switch S8, one end of the piezoelectric energy collector PEH2 is electrically connected to one end of the electronic switch S5 and one end of the electronic switch S8, the other end of the electronic switch S5 is electrically connected to one end of the electronic switch S6 and one end of the electric energy transfer module, the other end of the electronic switch S6 is electrically connected to the other end of the piezoelectric energy collector PEH2 and one end of the electronic switch S7, and the other end of the electronic switch S7 is electrically connected to the other end of the electronic switch S8 and the other end of the electric energy transfer module.

The invention has the beneficial effects that:

the invention provides an energy extraction interface circuit based on a double-voltage electric energy collector, which comprises a first piezoelectric energy collection module, a second piezoelectric energy collection module and an electric energy transfer module, wherein the first piezoelectric energy collection module and the second piezoelectric energy collection module are respectively and electrically connected with the electric energy transfer module; aiming at an energy extraction cycle of each piezoelectric energy collection module, the energy extraction interface circuit based on the double-voltage electric energy collector is divided into two stages to be carried out, the first stage adopts a synchronous switching technology to extract energy in the piezoelectric energy collector PEH1 or the piezoelectric energy collector PEH2 into an inductor L1, and the second stage realizes pre-biasing of voltage at two ends of the piezoelectric energy collector PEH2 or voltage at two ends of the piezoelectric energy collector PEH1 and electric energy generated by magnetic energy of the inductor L1 to be transferred into an energy storage capacitor CS through follow current of the inductor L1; simulation verifies that when the piezoelectric energy collector PEH1 and the piezoelectric energy collector PEH2 are excited under constant amplitude, the optimal value of the output power of the piezoelectric energy collector is 7.3 times of the optimal value of the power of a Full Bridge Rectifier (FBR) and 4.3 times of the optimal value of the power of a SECE circuit. Meanwhile, the output power stable value of the invention is 5.1 times of the optimal value of the Full Bridge Rectifier (FBR) power and 1.2 times of the optimal value of the SECE circuit power; moreover, the applicable load resistance range of the invention is far superior to that of a Full Bridge Rectifier (FBR), even slightly superior to that of a SECE circuit.

Drawings

Fig. 1 is a schematic topology diagram of an energy extraction interface circuit based on a dual voltage electrical energy collector according to the present invention;

fig. 2 is a schematic diagram of the operation principle of the energy extraction interface circuit based on the dual-voltage electric energy collector according to the present invention;

fig. 3 is a schematic diagram of a typical waveform of an energy extraction interface circuit based on a dual voltage electrical energy collector according to the present invention;

fig. 4 is a schematic diagram comparing the output power of the energy extraction interface circuit based on the dual voltage electric energy collector proposed by the present invention with the prior art;

fig. 5 is a schematic diagram of an actual operation architecture of the dual voltage electrical energy collector-based energy extraction interface circuit according to the present invention.

Detailed Description

In order to more clearly and completely explain the technical scheme of the invention, the invention is further explained with reference to the attached drawings.

Referring to fig. 1 and 2, the invention provides an energy extraction interface circuit based on a dual-voltage energy collector, including a first piezoelectric energy collection module 1, a second piezoelectric energy collection module 2, and an electric energy transfer module 3, where the first piezoelectric energy collection module 1 and the second piezoelectric energy collection module 2 are respectively electrically connected to the electric energy transfer module 3, the electric energy transfer module 3 includes an electronic switch S9, an electronic switch S10, an electronic switch S11, a freewheeling diode D1, a freewheeling diode D2, a freewheeling diode D3, an inductor L1, a capacitor CS, and a load resistor RL, one end of the electronic switch S9 is respectively electrically connected to one end of the first piezoelectric energy collection module 1 and one end of the freewheeling diode D1, the other end of the electronic switch S9 is respectively electrically connected to one end of the electronic switch S10, one end of the freewheeling diode D3, one end of the inductor L1, and the other end of the inductor L1 is respectively electrically connected to the other end of the freewheeling diode D1, the inductor L3583, the second end of the inductor L1, One end of a fly-wheel diode D2 and one end of an electronic switch S11 are electrically connected, the other end of the fly-wheel diode D3 is electrically connected with one end of a capacitor CS and one end of a load resistor RL respectively and is grounded, the other end of the electronic switch S11 is electrically connected with the other end of the first piezoelectric energy collection module 1, the other end of the capacitor CS, the other end of the load resistor RL and one end of the second piezoelectric energy collection module 2 respectively, and the other end of the fly-wheel diode D2 is electrically connected with the other end of the electronic switch S10 and the other end of the second piezoelectric energy collection module 2 respectively; the first piezoelectric energy collecting module 1 comprises a piezoelectric energy collector PEH1, an electronic switch S1, an electronic switch S2, an electronic switch S3 and an electronic switch S4, wherein one end of the piezoelectric energy collector PEH1 is electrically connected with one end of the electronic switch S1 and one end of the electronic switch S4 respectively, the other end of the electronic switch S1 is electrically connected with one end of the electronic switch S2 and one end of the electric energy transfer module 3 respectively, the other end of the electronic switch S2 is electrically connected with the other end of the piezoelectric energy collector PEH1 and one end of the electronic switch S3 respectively, and the other end of the electronic switch S3 is electrically connected with the other end of the electronic switch S4 and the other end of the electric energy transfer module 3 respectively; the second piezoelectric energy collecting module 2 comprises a piezoelectric energy collector PEH2, an electronic switch S5, an electronic switch S6, an electronic switch S7 and an electronic switch S8, wherein one end of the piezoelectric energy collector PEH2 is electrically connected with one end of the electronic switch S5 and one end of the electronic switch S8, the other end of the electronic switch S5 is electrically connected with one end of the electronic switch S6 and one end of the electric energy transfer module 3, the other end of the electronic switch S6 is electrically connected with the other end of the piezoelectric energy collector PEH2 and one end of the electronic switch S7, and the other end of the electronic switch S7 is electrically connected with the other end of the electronic switch S8 and the other end of the electric energy transfer module 3.

In the present embodiment:

the specific operation principle of the energy extraction interface circuit based on the double-voltage electric energy collector is described as follows: when the voltage VPEH1 at the two ends of the piezoelectric energy collector PEH1 reaches a maximum value, the electronic switch S1, the electronic switch S3, the electronic switch S9 and the electronic switch S11 are closed, the pinch-off capacitor CP1 and the inductor L1 in the piezoelectric energy collector PEH1 form an L1-CP1 resonant circuit, after a quarter of a resonant period, the charges on the pinch-off capacitor CP1 are all transferred to the L1, the voltage VPEH1 is suddenly reduced from a maximum value to 0V, and the current in the L1 reaches a maximum value; at the moment, the electronic switch S1, the electronic switch S3, the electronic switch S9 and the electronic switch S11 are opened, the electronic switch S5 and the electronic switch S7 are closed, and a new L1-CS-CP2 resonant loop is formed by the inductor L1, the capacitor CS and the pinch-off capacitor CP2 of the piezoelectric energy collector PEH 2;

the freewheeling diode D2 and the freewheeling diode D3 ensure that a small portion of the energy stored in the inductor L1 is transferred to the CP2 after one-half of the resonant period to achieve the pre-bias of the voltage VPEH2 to increase its electrical damping, and the remaining most of the energy is transferred to the capacitor CS to complete the energy storage;

when the voltage VPEH1 at the two ends of the piezoelectric energy collector PEH1 reaches a minimum value, the electronic switch S2, the electronic switch S4, the electronic switch S9 and the electronic switch S11 are closed, the pinch-off capacitor CP1 and the inductor L1 form an L1-CP1 resonant circuit, after a quarter of a resonant period, all charges on the pinch-off capacitor CP1 are transferred into the inductor L1, the voltage VPEH1 is suddenly increased to 0V from the minimum value, and the current in the inductor L1 reaches the maximum value; at this time, the electronic switch S2, the electronic switch S4, the electronic switch S9 and the electronic switch S11 are opened, the electronic switch S6 and the electronic switch S8 are closed, and the inductor L1, the capacitor CS and the pinch-off capacitor CP2 form a new L1-CS-CP2 resonant circuit.

The freewheeling diode D2 and the freewheeling diode D3 ensure that a small part of the energy stored in the inductor L1 is transferred to the pinch-off capacitor CP2 after one-half of the resonant period to realize that the voltage VPEH2 is pre-biased to improve the electrical damping thereof, and most of the remaining energy is transferred to the capacitor CS to finish energy storage;

similarly, when the voltage VPEH2 across the piezoelectric energy collector PEH2 reaches a maximum value, the electronic switch S5, the electronic switch S7, the electronic switch S10 and the electronic switch S11 are closed, the pinch-off capacitor CP2 and the inductor L1 form an L1-CP2 resonant circuit, after a quarter of a resonant period, the charge on the pinch-off capacitor CP2 is completely transferred to the inductor L1, the voltage VPEH2 is then abruptly decreased from a maximum value to 0V, and the current in the inductor L1 reaches a maximum value; at the moment, the electronic switch S5, the electronic switch S7, the electronic switch S10 and the electronic switch S11 are opened, the electronic switch S2 and the electronic switch S4 are closed, and a new L1-CS-CP1 resonant circuit is formed by the inductor L1, the capacitor CS and the pinch-off capacitor CP 1;

the freewheeling diode D1 and the freewheeling diode D3 ensure that a small portion of the energy stored in the inductor L1 is transferred to the pinch-off capacitor CP1 after one-half of the resonant period to achieve pre-biasing of the voltage VPEH1 to increase its electrical damping, and the remaining majority is transferred to the CS to complete energy storage;

when the voltage VPEH2 at the two ends of the piezoelectric energy collector PEH2 reaches a minimum value, the electronic switch S6, the electronic switch S8, the electronic switch S10 and the electronic switch S11 are closed, the pinch-off capacitor CP2 and the inductor L1 form an L1-CP2 resonant circuit, after a quarter of a resonant period, all charges on the pinch-off capacitor CP2 are transferred into the inductor L1, the voltage VPEH2 is suddenly increased to 0V from the minimum value, and the current in the inductor L1 reaches the maximum value; at the moment, the electronic switch S6, the electronic switch S8, the electronic switch S10 and the electronic switch S11 are opened, the electronic switch S1 and the electronic switch S3 are closed, and a new L1-CS-CP1 resonant circuit is formed by the inductor L1, the capacitor CS and the pinch-off capacitor CP 1;

freewheeling diode D1 and freewheeling diode D3 ensure that a small portion of the energy stored in inductor L1 is transferred to pinch-off capacitor CP1 after one-half of the resonant period to achieve pre-biasing of voltage VPEH1 to increase its electrical damping, and the remaining majority is transferred to capacitor CS to complete energy storage.

Referring to fig. 3, a typical waveform of an energy extraction interface circuit based on a dual voltage electrical energy collector in steady state operation is provided. When the voltage VPEH1 or the voltage VPEH2 reaches a maximum or minimum value, the corresponding switch is closed, forming an LC resonant tank of the first stage. The energy of one of the piezoelectric energy harvester PEH1 or the piezoelectric energy harvester PEH2 is instantaneously extracted into the inductor L1 while the piezoelectric voltage rapidly reaches 0V. Then, the inductor performs follow current, and enters a second stage, the other piezoelectric energy collector is charged in an LC resonance circuit formed in the follow current stage, namely pre-biased, and meanwhile, the residual energy in the inductor L1 is transferred to the energy storage capacitor CS, and the piezoelectric voltage and key device current enlarged images of dotted line boxes of (i) and (ii) clearly show the operation characteristics of the two stages.

Referring to fig. 4, a graph of power versus load resistance obtained using an ideal device in the simulation software ltslice is shown. Under the same amplitude excitation condition, the output power of the invention is obviously improved compared with the output power of the traditional two full-bridge rectifier parallel circuits and the traditional double-input SECE circuit. At the optimal load resistance value, the output power of the invention is 7.3 times of the optimal power of the full-bridge structure and 4.3 times of the optimal power of the SECE circuit. Meanwhile, the output power stable value of the invention is 5.1 times of the power optimal value of the full bridge circuit and 1.2 times of the power optimal value of the SECE circuit; moreover, the applicable load resistance range of the invention is far superior to that of a full-bridge circuit, even slightly superior to that of an SECE circuit.

Referring to fig. 5, a practical application architecture of an energy extraction interface circuit based on dual voltage power collectors according to the present invention includes an SMPB circuit module, a Passive Start Module (PSM), a Zero Crossing Detector (ZCD), a peak detector (PKD), a Digital Logic Controller (DLC), and a Switch Driver Circuit (SDC);

the passive starting module PSM is used for accumulating energy at first so as to drive the peak value detector PKD, the zero-crossing detector ZCD and the digital logic controller DLC after cold starting;

the peak detector PKD is used for monitoring the maximum value and the time corresponding to the minimum value of the piezoelectric waveform in real time so as to enter a first stage;

the zero-crossing detector ZCD is used for monitoring the ending moment of the first stage in real time so as to enter the second stage seamlessly;

the digital logic controller DLC generates a switch control signal through a digital logic circuit according to signals of the peak value detector PKD and the zero-crossing detector ZCD;

the switch driving circuit SDC drives the MOS switches S1-S11 in the SMPB circuit block with the switch signal output by the digital logic controller DLC to complete the correct operation of the whole circuit.

Of course, the present invention may have other embodiments, and based on the embodiments, those skilled in the art can obtain other embodiments without any creative effort, and all of them are within the protection scope of the present invention.