CN202385029U - Piezoelectric energy accumulating device - Google Patents
- ️Wed Aug 15 2012
CN202385029U - Piezoelectric energy accumulating device - Google Patents
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- CN202385029U CN202385029U CN2011205538991U CN201120553899U CN202385029U CN 202385029 U CN202385029 U CN 202385029U CN 2011205538991 U CN2011205538991 U CN 2011205538991U CN 201120553899 U CN201120553899 U CN 201120553899U CN 202385029 U CN202385029 U CN 202385029U Authority
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Abstract
The utility model relates to an energy accumulating device, in particular to a piezoelectric energy accumulating device which comprises a piezoelectric double-wafer cantilever, a rectifying circuit, a direct current-direct current (DC-DC) regulating circuit, an energy storage element and a lead; the piezoelectric double-wafer cantilever is connected with the input end of the rectifying circuit through the lead; the output end of the rectifying circuit is connected with the input end of the DC-DC regulating circuit; and the output end of the DC-DC regulating circuit is connected with the energy storage element. According to the piezoelectric energy accumulating device, the average input resistance of a direct current converter is regulated by regulating the dutyfactor of a metal oxide semiconductor (MOS) tube in the DC-DC regulating circuit, so that the impedance matching with a piezoelectric energy accumulating element is realized, and the output power of the piezoelectric energy accumulating device is improved.
Description
技术领域 technical field
本实用新型涉及一种俘能装置，尤其是一种压电俘能装置。The utility model relates to an energy harvesting device, in particular to a piezoelectric energy harvesting device.
背景技术 Background technique
随着信息时代的到来，各类微电子、无线网络传感器和MEMS等低功耗产品得到了大力发展，目前它们主要的供能方式是电池，但是电池方式存在着诸多弊端，如电池寿命有限，需要定时更换，有时会受到环境的限制而造成更换电池困难。环境存在丰富的低频机械振动能，如果能从周围环境中收集能量，将能为微功耗电子产品提供可靠的电能供给。压电式的振动俘能方式因具有较高的功率密度，无需外界电源，不发热、无电磁干扰、无污染和易于实现结构的小型化、集成化等优点，被广泛应用于环境振动能量的收集。压电俘能装置具有输出电压高、电流小、内阻大的特点。由于压电器件本身机电耦合系数一般较低，从而造成了压电能量收集装置的机电能量转换的工作效率较低。With the advent of the information age, various low-power products such as microelectronics, wireless network sensors and MEMS have been vigorously developed. At present, their main energy supply method is battery, but there are many disadvantages in the battery method, such as limited battery life, It needs to be replaced regularly, and sometimes it is difficult to replace the battery due to environmental restrictions. The environment is rich in low-frequency mechanical vibration energy. If energy can be collected from the surrounding environment, it will be able to provide reliable power supply for micro-power electronic products. The piezoelectric vibration energy harvesting method is widely used in environmental vibration energy due to its high power density, no need for external power supply, no heat generation, no electromagnetic interference, no pollution, and easy realization of structure miniaturization and integration. collect. Piezoelectric energy harvesting devices have the characteristics of high output voltage, low current and large internal resistance. Since the electromechanical coupling coefficient of the piezoelectric device itself is generally low, the working efficiency of the electromechanical energy conversion of the piezoelectric energy harvesting device is low.
实用新型内容 Utility model content
本实用新型所要解决的技术问题是针对上述背景技术的不足，提供了一种压电俘能装置。The technical problem to be solved by the utility model is to provide a piezoelectric energy harvesting device in view of the deficiency of the above-mentioned background technology.
本实用新型为实现上述实用新型目的采用如下技术方案：The utility model adopts following technical scheme for realizing above-mentioned utility model purpose:
一种压电俘能装置包括：压电双晶片悬臂、整流电路、DC-DC调节电路、储能元件；其中：所述压电双晶片悬臂通过导线与整流电路的输入端连接，整流电路的输出端与DC-DC调节电路的输入端连接，DC-DC调节电路的输出端与储能元件连接。A piezoelectric energy harvesting device includes: a piezoelectric bimorph cantilever, a rectifier circuit, a DC-DC regulating circuit, and an energy storage element; wherein: the piezoelectric bimorph cantilever is connected to the input end of the rectifier circuit through a wire, and the The output terminal is connected with the input terminal of the DC-DC regulating circuit, and the output terminal of the DC-DC regulating circuit is connected with the energy storage element.
所述压电俘能装置中，所述DC-DC调节电路包括：直流变换器和脉冲触发电路，脉冲触发电路的输出端与直流变换器中MOS管的门极连接；In the piezoelectric energy harvesting device, the DC-DC regulating circuit includes: a DC converter and a pulse trigger circuit, the output end of the pulse trigger circuit is connected to the gate of the MOS transistor in the DC converter;
所述脉冲触发电路包括：比较器，第一电阻、第二电阻、第三电阻，第二电容，第一二极管、第二二极管，可调电阻，第一电阻的一端接直流电源，第一电阻的另一端、第二电阻的一端、第三电阻的一端分别与比较器的正输入端连接，第二电阻的另一端接地，可调电阻的可调端与比较器的输出端相连接，可调电阻的一端与第一二极管的阴极连接，可调电阻的另一端与第二二极管的阳极连接，第一二极管的阳极、第二二极管的阴极、第二电容的正极分别与比较器的负输入端连接，第二电容的负极接地；The pulse trigger circuit includes: a comparator, a first resistor, a second resistor, a third resistor, a second capacitor, a first diode, a second diode, an adjustable resistor, and one end of the first resistor is connected to a DC power supply , the other end of the first resistor, one end of the second resistor, and one end of the third resistor are respectively connected to the positive input end of the comparator, the other end of the second resistor is grounded, the adjustable end of the adjustable resistor is connected to the output end of the comparator One end of the adjustable resistor is connected to the cathode of the first diode, the other end of the adjustable resistor is connected to the anode of the second diode, the anode of the first diode, the cathode of the second diode, The positive pole of the second capacitor is respectively connected to the negative input terminal of the comparator, and the negative pole of the second capacitor is grounded;
所述直流变换器包括：第一电容、第三二极管、电感、MOS管，第一电容的正极与MOS管的漏极连接，MOS管的源极与电感的一端以及第三二极管的阴极连接，第三二极管的阳极与电感的另一端构成直流变换器的输出端。The DC converter includes: a first capacitor, a third diode, an inductor, and a MOS tube, the anode of the first capacitor is connected to the drain of the MOS tube, the source of the MOS tube is connected to one end of the inductor, and the third diode The cathode of the third diode is connected, and the anode of the third diode and the other end of the inductor constitute the output end of the DC converter.
本实用新型采用上述技术方案，具有以下有益效果：提高了压电俘能装置的工作效率，增加了压电俘能装置的输出功率。The utility model adopts the above technical scheme and has the following beneficial effects: the working efficiency of the piezoelectric energy harvesting device is improved, and the output power of the piezoelectric energy harvesting device is increased.
附图说明 Description of drawings
图1为压电俘能装置结构的示意图。图中标号说明：1为基座，2为弹性层，3和4为压电层，5为质量块，6和7为导线，8为整流电路，9为DC-DC调节电路，10为储能元件。Figure 1 is a schematic diagram of the structure of a piezoelectric energy harvesting device. Explanation of the symbols in the figure: 1 is the base, 2 is the elastic layer, 3 and 4 are the piezoelectric layers, 5 is the quality block, 6 and 7 are the wires, 8 is the rectifier circuit, 9 is the DC-DC adjustment circuit, 10 is the storage energy components.
图2为DC-DC调节电路的电路图。图中标号说明：R1为第一电阻、R2为第二电阻、R3为第三电阻，C1为第一电容，C2为第二电容，L为电感，D1为第一二极管、D2为第二二极管，D3为第三二极管，Rw为可调电阻，Rw1为可调电阻Rw的上半端，Rw2为可调电阻Rw的下半端。Fig. 2 is a circuit diagram of a DC-DC regulating circuit. Explanation of symbols in the figure: R 1 is the first resistor, R 2 is the second resistor, R 3 is the third resistor, C 1 is the first capacitor, C 2 is the second capacitor, L is the inductance, D 1 is the first and second Diode, D 2 is the second diode, D 3 is the third diode, R w is the adjustable resistor, R w1 is the upper half of the adjustable resistor R w , R w2 is the lower end of the adjustable resistor R w half end.
图3为占空比D变化对Buck-boost变换器的平均输入电阻的示意图。Fig. 3 is a schematic diagram of the change of duty cycle D to the average input resistance of the Buck-boost converter.
图4为Buck-boost变换器效率随加速度变化的关系示意图。Fig. 4 is a schematic diagram of the relationship between Buck-boost converter efficiency and acceleration.
具体实施方式 Detailed ways
下面结合附图对实用新型的技术方案进行详细说明：Below in conjunction with accompanying drawing, the technical scheme of utility model is described in detail:
如图1所示的压电俘能装置，包括压电双晶片悬臂、整流电路8、DC-DC调节电路9、储能元件10以及导线6和7。压电双晶片有压电层3、4和弹性层2。弹性层2超出压电层的部分插入到基座1内，称为固定端，以便对悬臂梁进行固定。与固定端相对应的悬臂梁的另一端称为自由端，在悬臂梁的自由端固定有质量块5。压电层3、4和弹性层2通过504万能胶粘接在一起，为了不影响导电性，在粘接的时候，在不影响粘结强度的前提下，粘结层要做到越薄越好。在压电层表面镀有金属电极，压电俘能元件的输出电能通过导线6、7引出。由于压电俘能元件输出电能为交流电，负载所需的为交流电，因此需要通过整流电路8将压电俘能元件的输出电能整定为直流电。DC-DC调节电路9用于实现对压电俘能元件的阻抗匹配。The piezoelectric energy harvesting device shown in FIG. 1 includes a piezoelectric bimorph cantilever, a rectifying circuit 8 , a DC-DC regulating circuit 9 , an energy storage element 10 , and wires 6 and 7 . A piezoelectric bimorph has piezoelectric layers 3, 4 and an elastic layer 2. The part of the elastic layer 2 beyond the piezoelectric layer is inserted into the base 1, called the fixed end, so as to fix the cantilever beam. The other end of the cantilever beam corresponding to the fixed end is called a free end, and a mass block 5 is fixed at the free end of the cantilever beam. Piezoelectric layers 3, 4 and elastic layer 2 are bonded together by 504 universal adhesive. In order not to affect the conductivity, when bonding, the adhesive layer should be thinner and thinner without affecting the bonding strength. good. Metal electrodes are plated on the surface of the piezoelectric layer, and the output electric energy of the piezoelectric energy harvesting element is drawn out through wires 6 and 7 . Since the output power of the piezoelectric energy harvesting element is alternating current, the load requires alternating current, so the output electric energy of the piezoelectric energy harvesting element needs to be adjusted to direct current through the rectification circuit 8 . The DC-DC regulating circuit 9 is used to realize impedance matching to the piezoelectric energy harvesting element.
DC-DC调节电路的拓扑结构有Buck、boost、Flyback及Buck-boost等，但是Buck-boost相比其它拓扑结构相比结构简单，且能够实现升降压，能够满足不同负载的电压需求，采用Buck-boost直流变换器的DC-DC调节电路如图2所示，包括：直流变换器和脉冲触发电路，脉冲触发电路的输出端与直流变换器中MOS管的门极连接。The topological structure of the DC-DC regulator circuit includes Buck, boost, Flyback, and Buck-boost, etc., but the Buck-boost is simpler in structure than other topological structures, and can realize buck-boosting, which can meet the voltage requirements of different loads. The DC-DC regulation circuit of the Buck-boost DC converter is shown in Figure 2, including: a DC converter and a pulse trigger circuit, the output of the pulse trigger circuit is connected to the gate of the MOS transistor in the DC converter.
Buck-boost变换器包括：第一电容C1、第三二极管D3、电感L、MOS管，第一电容C1的正极与MOS管的漏极连接，MOS管的源极与电感L的一端以及第三二极管D3的阴极连接，第三二极管D3的阳极与电感L的另一端构成直流变换器的输出端。The Buck-boost converter includes: a first capacitor C 1 , a third diode D 3 , an inductor L, and a MOS tube. The anode of the first capacitor C 1 is connected to the drain of the MOS tube, and the source of the MOS tube is connected to the inductor L One end of and the cathode of the third diode D3 are connected, and the anode of the third diode D3 and the other end of the inductor L constitute the output end of the DC converter.
当Buck-boost变换器工作在不连续电流模式(Discontinuous Current Mode，DCM)时，其平均输入电阳为When the Buck-boost converter works in the discontinuous current mode (Discontinuous Current Mode, DCM), its average input voltage is
RR inin == 22 LfLf swsw DD. 22 -- -- -- (( 11 ))
由式(1)可知，Buck-boost变换器的平均输入电阻只与Buck-boost变换器的电感L、MOSFET开关管的开关频率fsw和及占空比D有关，而与输入电压及负载电阻等无关。因此，当电感及开关频率确定后，通过调节占空比D的大小就可实现对Buck-boost变换器平均输入电阻的调节，从而实现与压电俘能元件的阻抗匹配。It can be seen from formula (1) that the average input resistance of the Buck-boost converter is only related to the inductance L of the Buck-boost converter, the switching frequency f sw of the MOSFET switch and the duty cycle D, but not to the input voltage and the load resistance It doesn't matter. Therefore, when the inductance and switching frequency are determined, the average input resistance of the Buck-boost converter can be adjusted by adjusting the duty cycle D, so as to achieve impedance matching with the piezoelectric energy harvesting element.
当不考虑Buck-boost变换器的内部损耗时，负载上获得的有功功率为When the internal loss of the Buck-boost converter is not considered, the active power obtained on the load is
PP oo == VV rectrect 22 ×× DD. 22 22 LfLf swsw == VV rectrect 22 RR inin == PP inin -- -- -- (( 22 ))
式中Vrect为Buck-boost变换器的输入电压。由式(2)可知，Buck-boost变换器的负载上的有功功率就等于Buck-boost变换器输入端的有功功率，而与负载阻值的大小无关，，这说明变换器对负载起到了隔离作用，消除了因负载阻值变化给压电俘能元件的输出功率带来的影响，使压电俘能元件的输出功率能够一直保持最大化。Where V rect is the input voltage of the Buck-boost converter. It can be seen from formula (2) that the active power on the load of the Buck-boost converter is equal to the active power at the input end of the Buck-boost converter, regardless of the size of the load resistance, which shows that the converter has an isolation effect on the load , which eliminates the influence of the output power of the piezoelectric energy harvesting element due to the change of the load resistance, so that the output power of the piezoelectric energy harvesting element can be kept maximized.
脉冲触发电路包括：比较器，第一电阻R1、第二电阻R2、第三电阻R3，第二电容C2，第一二极管D1、第二二极管D2，可调电阻Rw，第一电阻R1的一端接直流电源，第一电阻R1的另一端、第二电阻R2的一端、第三电阻R3的一端分别与比较器的正输入端连接，第二电阻R2的另一端接地，可调电阻Rw的可调端与比较器的输出端相连接，可调电阻Rw的上半端Rw1与第一二极管D1的阴极连接，可调电阻Rw的下半端Rw2与第二二极管D2的阳极连接，第一二极管D1的阳极、第二二极管D2的阴极及第二电容C2的正极分别与比较器的负输入端连接，第二电容C2的负极接地。其中：第二电容C2为可调电容。The pulse trigger circuit includes: a comparator, a first resistor R 1 , a second resistor R 2 , a third resistor R 3 , a second capacitor C 2 , a first diode D 1 , a second diode D 2 , adjustable Resistor R w , one end of the first resistor R1 is connected to a DC power supply, the other end of the first resistor R1 , one end of the second resistor R2 , and one end of the third resistor R3 are respectively connected to the positive input end of the comparator. The other end of the second resistor R2 is grounded, the adjustable end of the adjustable resistor Rw is connected to the output end of the comparator, and the upper half end Rw1 of the adjustable resistor Rw is connected to the cathode of the first diode D1 , which can be The lower half Rw2 of the resistor Rw is connected to the anode of the second diode D2 , and the anode of the first diode D1 , the cathode of the second diode D2 and the anode of the second capacitor C2 are respectively connected to The negative input terminal of the comparator is connected, and the negative pole of the second capacitor C2 is grounded. Wherein: the second capacitor C 2 is an adjustable capacitor.
脉冲触发电路用于实现控制开关管MOSFET的导通与关断，并控制占空比的大小。脉冲触发电路输出信号的频率fsw和占空比D分别为The pulse trigger circuit is used to control the switching on and off of the switching tube MOSFET, and to control the size of the duty cycle. The frequency f sw and duty cycle D of the output signal of the pulse trigger circuit are respectively
ff swsw == 11 RR ww CC 22 lnln 22 (( 11 -- VV ff )) == 11 (( RR ww 11 ++ RR ww 22 )) CC 22 lnln 22 (( 11 -- VV ff )) -- -- -- (( 33 ))
Vf为二极管D1、D2的导通管压降，由式(3)可知通过调节可变电容C2就可以实现调节fsw。D＝Rw2/(Rw1+Rw2)＝Rw2/Rw (4)V f is the conduction tube voltage drop of diodes D 1 and D 2 , and it can be known from formula (3) that f sw can be adjusted by adjusting variable capacitor C 2 . D＝R w2 /(R w1 +R w2 )＝R w2 /R w (4)
由式(4)可知，占空比D的大小可以通过调节可变电阻Rw来实现，当调节可变电阻Rw时，Rw2同时被改变，而可变电阻Rw的阻值大小是不变的，从而实现了对占空比D的调节。储能元件10用来存储压电俘能元件的输出电能，以便供给负载使用，储能元件可以是充电电池或者超级电容。It can be seen from formula (4) that the size of the duty cycle D can be realized by adjusting the variable resistor R w . When the variable resistor R w is adjusted, R w2 is changed at the same time, and the resistance value of the variable resistor R w is Unchanged, thus realizing the adjustment of the duty cycle D. The energy storage element 10 is used to store the output electric energy of the piezoelectric energy harvesting element so as to supply the load. The energy storage element may be a rechargeable battery or a supercapacitor.
压电层所用材料为PZT-51型压电陶瓷，弹性层的材料为不锈钢。悬臂梁的结构参数：弹性层的尺寸为60mm×7mm×0.4mm，压电层尺寸为45mm×7mm×0.3mm。质量块的材料为铅，其质量为10g。电路参数如下：电路中的所有二极管D1、D2所用型号为肖特基二极管BAT48，电感L值为4.7mH，开关管MOSFET的器件型号为BSS138，比较器所用为LMC7215，储能元件为超级电容。Buck-boost变换器的等效输入电阻与压电俘能元件的等效阻抗之间的关系如图3所示。由图3以看出，调节Buck-boost变换器的占空比D的大小，Buck-boost变换器的等效输入电阻也在变化，在D＝2.1％时，Buck-boost变换器的等效输入电阻与压电俘能元件的等效阻抗相等，从而实现了阻抗匹配。图4说明了系统功率及Buck-boost变换器效率随加速度变化的关系。在加速度的0.2m/s2～2m/s2的变化范围内，Buck-boost变换器的效率在74.6％～85％之间，说明采用Buck-boost变换器阻抗匹配后，能够有效提高负载功率的大小。The piezoelectric layer is made of PZT-51 piezoelectric ceramics, and the elastic layer is made of stainless steel. The structural parameters of the cantilever beam: the size of the elastic layer is 60mm×7mm×0.4mm, and the size of the piezoelectric layer is 45mm×7mm×0.3mm. The material of mass block is lead, and its mass is 10g. The circuit parameters are as follows: all diodes D 1 and D 2 in the circuit use Schottky diode BAT48, the inductance L value is 4.7mH, the switching tube MOSFET device model is BSS138, the comparator uses LMC7215, and the energy storage element is super capacitance. The relationship between the equivalent input resistance of the Buck-boost converter and the equivalent impedance of the piezoelectric energy harvesting element is shown in Figure 3. It can be seen from Figure 3 that the equivalent input resistance of the Buck-boost converter is also changing when the duty cycle D of the Buck-boost converter is adjusted. When D=2.1%, the equivalent input resistance of the Buck-boost converter is The input resistance is equal to the equivalent impedance of the piezoelectric energy harvesting element, thereby realizing impedance matching. Figure 4 illustrates the relationship between system power and Buck-boost converter efficiency as a function of acceleration. In the variation range of the acceleration of 0.2m/s 2 to 2m/s 2 , the efficiency of the Buck-boost converter is between 74.6% and 85%, indicating that the impedance matching of the Buck-boost converter can effectively increase the load power the size of.
本实用新型所涉及的压电俘能装置依据阻抗匹配原理，在负载电阻与电源内部的阻抗相匹配时，负载获得的功率最大。对于压电俘能元件根据机电等效和类比的原理可以等效为一个与电容相并联的电流源。为了使压电元件的输出功率最大，必须要保证负载电阻与压电元件的内部阻抗相匹配，但是在实际应用中，由于负载的多种多样，负载的电阻值也是不尽相同的，利用DC-DC变换器可以实现与压电元件的阻抗匹配，从而达到负载功率最大化的目的。The piezoelectric energy harvesting device involved in the utility model is based on the principle of impedance matching, when the load resistance matches the internal impedance of the power supply, the load obtains the maximum power. According to the principle of electromechanical equivalence and analogy, the piezoelectric energy harvesting element can be equivalent to a current source connected in parallel with a capacitor. In order to maximize the output power of the piezoelectric element, it is necessary to ensure that the load resistance matches the internal impedance of the piezoelectric element. However, in practical applications, due to the variety of loads, the resistance value of the load is also different. Using DC - The DC converter can achieve impedance matching with the piezoelectric element, so as to achieve the purpose of maximizing the load power.
Claims (2)
1.一种压电俘能装置，其特征在于包括：压电双晶片悬臂、整流电路、DC-DC调节电路、储能元件；其中：所述压电双晶片悬臂通过导线与整流电路的输入端连接，整流电路的输出端与DC-DC调节电路的输入端连接，DC-DC调节电路的输出端与储能元件连接。 1. A piezoelectric energy harvesting device, characterized in that it comprises: a piezoelectric bimorph cantilever, a rectifier circuit, a DC-DC regulating circuit, and an energy storage element; wherein: the piezoelectric bimorph cantilever is input through a wire and a rectifier circuit The output terminal of the rectification circuit is connected with the input terminal of the DC-DC regulating circuit, and the output terminal of the DC-DC regulating circuit is connected with the energy storage element. 2.根据权利要求1所述的压电俘能装置，其特征在于所述DC-DC调节电路包括：直流变换器和脉冲触发电路，脉冲触发电路的输出端与直流变换器中MOS管的门极连接； 2. The piezoelectric energy harvesting device according to claim 1, wherein the DC-DC regulating circuit comprises: a DC converter and a pulse trigger circuit, the output terminal of the pulse trigger circuit and the gate of the MOS tube in the DC converter pole connection; 所述脉冲触发电路包括：比较器，第一电阻、第二电阻、第三电阻，第二电容，第一二极管、第二二极管，可调电阻，第一电阻的一端接直流电源，第一电阻的另一端、第二电阻的一端、第三电阻的一端分别与比较器的正输入端连接，第二电阻的另一端接地，可调电阻的可调端与比较器的输出端相连接，可调电阻的一端与第一二极管的阴极连接，可调电阻的另一端与第二二极管的阳极连接，第一二极管的阳极、第二二极管的阴极、第二电容的正极分别与比较器的负输入端连接，第二电容的负极接地； The pulse trigger circuit includes: a comparator, a first resistor, a second resistor, a third resistor, a second capacitor, a first diode, a second diode, an adjustable resistor, and one end of the first resistor is connected to a DC power supply , the other end of the first resistor, one end of the second resistor, and one end of the third resistor are respectively connected to the positive input end of the comparator, the other end of the second resistor is grounded, the adjustable end of the adjustable resistor is connected to the output end of the comparator One end of the adjustable resistor is connected to the cathode of the first diode, the other end of the adjustable resistor is connected to the anode of the second diode, the anode of the first diode, the cathode of the second diode, The positive pole of the second capacitor is respectively connected to the negative input terminal of the comparator, and the negative pole of the second capacitor is grounded; 所述直流变换器包括：第一电容、第三二极管、电感、MOS管，第一电容的正极与MOS管的漏极连接，MOS管的源极与电感的一端以及第三二极管的阴极连接，第三二极管的阳极与电感的另一端构成直流变换器的输出端。 The DC converter includes: a first capacitor, a third diode, an inductor, and a MOS tube, the anode of the first capacitor is connected to the drain of the MOS tube, the source of the MOS tube is connected to one end of the inductor, and the third diode The cathode of the third diode is connected, and the anode of the third diode and the other end of the inductor constitute the output end of the DC converter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102437776A (en) * | 2011-12-27 | 2012-05-02 | 东南大学 | Piezoelectric energy harvesting device |
| CN111684701A (en) * | 2018-02-07 | 2020-09-18 | 沃思电子埃索斯有限责任两合公司 | Device for obtaining electrical energy and energy generator having such device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102437776A (en) * | 2011-12-27 | 2012-05-02 | 东南大学 | Piezoelectric energy harvesting device |
| CN111684701A (en) * | 2018-02-07 | 2020-09-18 | 沃思电子埃索斯有限责任两合公司 | Device for obtaining electrical energy and energy generator having such device |
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