CN108258811B - A composite energy harvesting circuit - Google Patents

A composite energy harvesting circuit Download PDF

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CN108258811B
CN108258811B CN201810082955.4A CN201810082955A CN108258811B CN 108258811 B CN108258811 B CN 108258811B CN 201810082955 A CN201810082955 A CN 201810082955A CN 108258811 B CN108258811 B CN 108258811B
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diode
energy
tube
storage capacitor
energy storage
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CN108258811A (en
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夏银水
王修登
施阁
叶益迭
钱利波
夏桦康
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Ningbo University
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J15/00Systems for storing electric energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/32Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from a charging set comprising a non-electric prime mover rotating at constant speed

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  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
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Abstract

The invention discloses a composite energy acquisition circuit which is characterized by comprising a thermoelectric generation sheet, a piezoelectric sheet, a positive and 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; the energy collection device has the advantages that the parasitic capacitance in the piezoelectric sheet and the first energy storage capacitor are connected in series to generate LC oscillation, charges accumulated on the parasitic capacitance in the piezoelectric sheet and the first energy storage capacitor are transferred to the first inductance, when the current on the first inductance reaches the maximum value, the first PNP tube or the second PNP tube is immediately disconnected through the positive and negative peak detection module, then the energy stored on the first inductance is fully flowed to the load and the second energy storage capacitor through the first diode, and the whole circuit is completely self-started and self-powered and can continuously collect thermoelectric energy and piezoelectric vibration energy in the environment, so that the energy collection efficiency of the whole circuit is improved, and the use cost is reduced.

Description

一种复合能量采集电路A composite energy harvesting circuit

技术领域Technical field

本发明涉及一种能量采集电路,尤其是一种复合能量采集电路。The invention relates to an energy harvesting circuit, in particular to a composite energy harvesting circuit.

背景技术Background technique

压电式振动能量采集是一种利用压电材料的压电效应,对环境中的振动能进行采集的方法,由于压电片的输出电压是交流信号,而一般的电子设备是由直流电源供电的,因此,在压电片和电子设备之间需要一个接口电路,通过接口电路实现交流电压到直流电压的转变,而且这种接口电路的转换效率越高越好,最先提出来的接口电路是标准能量俘获电路,由一个二极管桥式整流电路和一个滤波电容构成,这种结构的优点是电路简单,稳定可靠,但是,由于存在二极管的阈值电压损失,使得电路的采集效率低下,而且这个结构的采集效率容易受负载的大小影响。Piezoelectric vibration energy harvesting is a method that uses the piezoelectric effect of piezoelectric materials to collect vibration energy in the environment. Since the output voltage of the piezoelectric sheet is an AC signal, general electronic equipment is powered by a DC power supply. , therefore, an interface circuit is needed between the piezoelectric sheet and the electronic device, through which the conversion of AC voltage to DC voltage is achieved, and the higher the conversion efficiency of this interface circuit, the better. The interface circuit that was first proposed It is a standard energy capture circuit, consisting of a diode bridge rectifier circuit and a filter capacitor. The advantage of this structure is that the circuit is simple, stable and reliable. However, due to the threshold voltage loss of the diode, the collection efficiency of the circuit is low, and this The collection efficiency of the structure is easily affected by the size of the load.

温差发电片可利用环境中的温差进行能量采集,但是通常环境中的温差较小,温差发电片的开路电压很低,发电片与负载之间的能量采集电路的效率等因素,增加了温差能利用的难度;目前温差热电能采集电路主要分为电容式电荷泵电路和电感式boost升压电路,电荷泵电路虽然可以提升温差发电片的电压,但是电荷泵结构驱动能力很弱,低压电荷泵电路更是效率低下;电感式boost升压电路虽然效率高,且驱动负载的能力强,但是一般温差发电片的开路电压低于开关管的阈值电压,这就导致了电感式boost升压电路往往需要外部供电电源,当未接通外部供电电源时无法自启动,增加了使用成本。Thermoelectric generators can use the temperature difference in the environment to collect energy. However, the temperature difference in the environment is usually small. The open circuit voltage of the thermoelectric generator is very low. Factors such as the efficiency of the energy collection circuit between the generator and the load increase the temperature difference energy. Difficulty of utilization; currently, thermoelectric energy harvesting circuits are mainly divided into capacitive charge pump circuits and inductive boost circuits. Although the charge pump circuit can increase the voltage of the thermoelectric power generation chip, the driving ability of the charge pump structure is very weak, and the low-voltage charge pump The circuit is even more inefficient; although the inductive boost circuit has high efficiency and strong ability to drive the load, the open circuit voltage of the thermoelectric generator is generally lower than the threshold voltage of the switching tube, which results in the inductive boost circuit often It requires an external power supply and cannot start automatically when the external power supply is not connected, which increases the cost of use.

为了能从环境中获取更多的能量,提高环境能量采集的总功率,有研究人员提出了多源能量采集的思想,即采集环境中的振动能、热能、微波辐射等多种形式的能量,但是由于不同能源产生的信号完全不同,不同的信号不能直接耦合在一起,所以一般的多源能量采集系统,通常采用比较法,即通过比较两种能量密度的大小选择采集其中能量较强的一种能量,因此会导致另一种能量无法被采集,影响整体采集效率。In order to obtain more energy from the environment and increase the total power of environmental energy harvesting, some researchers have proposed the idea of multi-source energy harvesting, that is, harvesting various forms of energy such as vibration energy, thermal energy, and microwave radiation in the environment. However, since the signals generated by different energy sources are completely different, different signals cannot be directly coupled together. Therefore, the general multi-source energy collection system usually uses the comparison method, that is, by comparing the magnitude of the two energy densities, the one with the stronger energy is selected and collected. One kind of energy will cause another kind of energy to be unable to be collected, affecting the overall collection efficiency.

发明内容Contents of the invention

本发明所要解决的技术问题是提供一种能够同时采集压电式振动能和温差热电能的复合能量采集电路,能量采集效率较高。The technical problem to be solved by the present invention is to provide a composite energy harvesting circuit that can simultaneously collect piezoelectric vibration energy and temperature difference thermoelectric energy, and has high energy collection efficiency.

本发明解决上述技术问题所采用的技术方案为:一种复合能量采集电路,包括温差发电片、压电片、正负峰值检测模块、零电位切换模块、第一电感、第一二极管、第一储能电容、第二储能电容和负载,所述的正负峰值检测模块包括第一NPN管、第二NPN管、第一PNP管、第二PNP管、第四二极管、第五二极管和第一电容,所述的温差发电片的第1引脚、所述的第一储能电容的一端及所述的第一电感的一端连接,所述的第一电感的另一端、所述的第一二极管的正极、所述的第一PNP管的发射极及所述的第二PNP管的发射极连接,所述的第一二极管的负极、所述的第二储能电容的正极及所述的负载的一端连接,所述的第二PNP管的集电极、所述的第二NPN管的基极、所述的第五二极管的负极、所述的零电位切换模块的第一输入端及所述的压电片的第1引脚连接,所述的第一PNP管的集电极、所述的第一NPN管的基极、所述的第四二极管的负极、所述的零电位切换模块的第二输入端及所述的压电片的第2引脚连接,所述的第一PNP管的基极与所述的第一NPN管的集电极连接,所述的第二PNP管的基极与所述的第二NPN管的集电极连接,所述的第五二极管的正极、所述的第二NPN管的发射极及所述的第一电容的一端连接,所述的第一电容的另一端、所述的第四二极管的正极及所述的第一NPN管的发射极连接,所述的温差发电片的第2引脚、所述的第一储能电容的另一端、所述的第二储能电容的负极、所述的负载的另一端及所述的零电位切换模块的接地端均接地。The technical solution adopted by the present invention to solve the above technical problems is: a composite energy collection circuit, including a thermoelectric power generation piece, a piezoelectric piece, a positive and negative peak detection module, a zero-potential switching module, a first inductor, a first diode, The first energy storage capacitor, the second energy storage capacitor and the load. The positive and negative peak detection module includes a first NPN tube, a second NPN tube, a first PNP tube, a second PNP tube, a fourth diode, Five diodes and the first capacitor are connected to the first pin of the thermoelectric power generation piece, one end of the first energy storage capacitor and one end of the first inductor, and the other end of the first inductor is connected One end, the anode of the first diode, the emitter of the first PNP tube and the emitter of the second PNP tube are connected, and the cathode of the first diode, the emitter of the first PNP tube and the emitter of the second PNP tube are connected. The anode of the second energy storage capacitor is connected to one end of the load, the collector of the second PNP tube, the base of the second NPN tube, the cathode of the fifth diode, the The first input end of the zero-potential switching module is connected to the first pin of the piezoelectric sheet, the collector of the first PNP tube, the base of the first NPN tube, the The cathode of the fourth diode, the second input end of the zero-potential switching module and the second pin of the piezoelectric sheet are connected, and the base of the first PNP tube is connected to the first The collector of the NPN tube is connected, the base of the second PNP tube is connected to the collector of the second NPN tube, the anode of the fifth diode and the emitter of the second NPN tube The electrode is connected to one end of the first capacitor, the other end of the first capacitor, the anode of the fourth diode and the emitter of the first NPN tube are connected, and the temperature difference generates electricity The second pin of the chip, the other end of the first energy storage capacitor, the negative electrode of the second energy storage capacitor, the other end of the load and the ground end of the zero potential switching module are all grounded .

所述的零电位切换模块包括第二二极管和第三二极管,所述的第二二极管的正极与所述的压电片的第1引脚连接,所述的第三二极管的正极与所述的压电片的第2引脚连接,所述的第二二极管的负极和所述的第三二极管的负极均接地。The zero-potential switching module includes a second diode and a third diode, the anode of the second diode is connected to the first pin of the piezoelectric sheet, and the third diode The anode of the diode is connected to the second pin of the piezoelectric piece, and the cathode of the second diode and the cathode of the third diode are both grounded.

与现有技术相比,本发明的优点在于通过将第一电感与压电片内的寄生电容以及由温差发电片充电的第一储能电容串联,产生LC振荡,将压电片内的寄生电容上积累的电荷和第一储能电容上积累的电荷转移到第一电感上,当第一电感上的电流达到最大值的瞬间,通过正负峰值检测模块立即断开第一PNP管或第二PNP管,然后将存储在第一电感上的能量通过第一二极管全部流向负载和第二储能电容,整体电路是完全自启动、自供电的,能够持续对所处环境中的温差热电能和压电振动能进行采集,从而提高了整体电路的能量采集效率,且降低了使用成本。Compared with the prior art, the advantage of the present invention is that by connecting the first inductor in series with the parasitic capacitance in the piezoelectric sheet and the first energy storage capacitor charged by the thermoelectric generator sheet, LC oscillation is generated, and the parasitic capacitance in the piezoelectric sheet is generated. The charge accumulated on the capacitor and the charge accumulated on the first energy storage capacitor are transferred to the first inductor. When the current on the first inductor reaches the maximum value, the first PNP tube or the first PNP tube is immediately disconnected through the positive and negative peak detection module. Two PNP tubes, and then all the energy stored in the first inductor flows to the load and the second energy storage capacitor through the first diode. The overall circuit is completely self-starting and self-powered, and can continuously respond to the temperature difference in the environment. Thermoelectric energy and piezoelectric vibration energy are collected, thereby improving the energy collection efficiency of the overall circuit and reducing the cost of use.

附图说明Description of the drawings

图1为本发明的电路结构示意图。Figure 1 is a schematic diagram of the circuit structure of the present invention.

具体实施方式Detailed ways

以下结合附图实施例对本发明作进一步详细描述。The present invention will be described in further detail below with reference to the embodiments of the drawings.

一种复合能量采集电路,包括温差发电片U1、压电片U2、正负峰值检测模块、零电位切换模块、第一电感L1、第一二极管D1、第一储能电容Ct、第二储能电容Cr和负载RL,正负峰值检测模块包括第一NPN管Q1、第二NPN管Q3、第一PNP管Q2、第二PNP管Q4、第四二极管D4、第五二极管D5和第一电容C1,温差发电片U1的第1引脚、第一储能电容Ct的一端及第一电感L1的一端连接,第一电感L1的另一端、第一二极管D1的正极、第一PNP管Q2的发射极及第二PNP管Q4的发射极连接,第一二极管D1的负极、第二储能电容Cr的正极及负载RL的一端连接,第二PNP管Q4的集电极、第二NPN管Q3的基极、第五二极管D5的负极、零电位切换模块的第一输入端及压电片U2的第1引脚连接,第一PNP管Q2的集电极、第一NPN管Q1的基极、第四二极管D4的负极、零电位切换模块的第二输入端及压电片U2的第2引脚连接,第一PNP管Q2的基极与第一NPN管Q1的集电极连接,第二PNP管Q4的基极与第二NPN管Q3的集电极连接,第五二极管D5的正极、第二NPN管Q3的发射极及第一电容C1的一端连接,第一电容C1的另一端、第四二极管D4的正极及第一NPN管Q1的发射极连接,温差发电片U1的第2引脚、第一储能电容Ct的另一端、第二储能电容Cr的负极、负载RL的另一端及零电位切换模块的接地端均接地。A composite energy harvesting circuit, including a thermoelectric power generating sheet U1, a piezoelectric sheet U2, a positive and negative peak detection module, a zero-potential switching module, a first inductor L1, a first diode D1, a first energy storage capacitor Ct, a second Energy storage capacitor Cr and load RL, the positive and negative peak detection module includes the first NPN tube Q1, the second NPN tube Q3, the first PNP tube Q2, the second PNP tube Q4, the fourth diode D4, and the fifth diode D5 is connected to the first capacitor C1, the first pin of the thermoelectric generator U1, one end of the first energy storage capacitor Ct and one end of the first inductor L1, and the other end of the first inductor L1 and the anode of the first diode D1 , the emitter of the first PNP tube Q2 and the emitter of the second PNP tube Q4 are connected, the cathode of the first diode D1, the anode of the second energy storage capacitor Cr and one end of the load RL are connected, the second PNP tube Q4 The collector, the base of the second NPN tube Q3, the cathode of the fifth diode D5, the first input terminal of the zero-potential switching module and the first pin of the piezoelectric sheet U2 are connected, and the collector of the first PNP tube Q2 , the base of the first NPN tube Q1, the cathode of the fourth diode D4, the second input terminal of the zero-potential switching module and the second pin of the piezoelectric sheet U2 are connected, and the base of the first PNP tube Q2 is connected to the second pin of the piezoelectric sheet U2. The collector of an NPN tube Q1 is connected, the base of the second PNP tube Q4 is connected to the collector of the second NPN tube Q3, the anode of the fifth diode D5, the emitter of the second NPN tube Q3 and the first capacitor C1 One end is connected, the other end of the first capacitor C1, the anode of the fourth diode D4 and the emitter of the first NPN tube Q1 are connected, the second pin of the thermoelectric generator U1 and the other end of the first energy storage capacitor Ct are connected , the negative electrode of the second energy storage capacitor Cr, the other end of the load RL and the ground end of the zero-potential switching module are all grounded.

零电位切换模块包括第二二极管D2和第三二极管D3,第二二极管D2的正极与压电片U2的第1引脚连接,第三二极管D3的正极与压电片U2的第2引脚连接,第二二极管D2的负极和第三二极管D3的负极均接地。The zero-potential switching module includes a second diode D2 and a third diode D3. The anode of the second diode D2 is connected to the first pin of the piezoelectric sheet U2, and the anode of the third diode D3 is connected to the piezoelectric sheet U2. The second pin of chip U2 is connected, the cathode of the second diode D2 and the cathode of the third diode D3 are both grounded.

采用以上结构的电路的能量采集原理如下:定义当压电片U2的第1引脚电压高于第2引脚电压时为正半周期,在正半周期内,温差发电片U1给第一储能电容Ct充电,压电片U2的第1引脚与第2引脚之间的压差逐渐增加,并且第二NPN管Q3、第四二极管D4、第一电容C1和压电片U2形成一个回路,压电片U2通过该回路给第一电容C1充电,直至压电片U2的第1引脚与第2引脚之间的压差达到峰值后,压差开始减小,随后压电片U2第2引脚的电压开始增加,但是由于第一电容C1上积累的电荷没有回路释放,因此,第一NPN管Q1的基极电压会高于第一NPN管Q1的发射极电压,而且两者之间的压差会逐渐变大,直到两者之间的压差大于第一NPN管Q1的阈值电压,此时第一NPN管Q1导通,导致第一PNP管Q2导通,同时由于压电片U2的第1引脚的电压高于第2引脚的电压,使压电片U2的第1引脚通过第二二极管D2接地,因此,压电片U2、第二二极管D2、第一电感L1、第一储能电容Ct和第一PNP管Q2将会构成一个LC振荡回路,并且该LC振荡回路通过四分之一个LC振荡周期,可以将第一电容C1上积累的电荷转移到第一电感L1上,同时完成了从电能向磁能的转换;当第一电感L1上的电流达到最大值时,第一电容C1上的电荷释放完毕,导致第一PNP管Q2断开,因此第一电感L1上的电流只能通过第一二极管D1流向第二储能电容Cr和负载RL,完成了磁能向电能的转换,从而实现了正半周期的能量提取;定义当压电片U2的第1引脚电压低于第2引脚电压时为负半周期内,在负半周期内,温差发电片U1给第一储能电容Ct充电,压电片U2两端的压差逐渐增加,并且第一NPN管Q1、第五二极管D5、第一电容C1和压电片U2形成一个回路,压电片U2通过该回路给第一电容C1充电,直至压电片U2两端压差达到峰值后,压差开始减小,压电片U2第1引脚的电压开始增加,但是由于第一电容C1上积累的电荷没有回路释放,因此第二NPN管Q3的基极电压会高于第二NPN管Q3的发射极电压,而且两者之间的压差会逐渐变大,直到两者之间的压差大于第二NPN管Q3的阈值电压,此时第二NPN管Q3导通,从而导致第二PNP管Q4导通,同时,由于压电片U2的第1引脚的电压低于第2引脚的电压,使压电片U2的第2引脚通过第三二极管D3接地,因此,压电片U2、第三二极管D3、第一电感L1、第一储能电容Ct和第二PNP管Q4将会构成一个LC振荡回路,并且该LC振荡回路通过四分之一个LC振荡周期,可以将第一电容C1上积累的电荷转移到第一电感L1上,同时完成了从电能向磁能的转换,当第一电感L1上的电流达到最大值时,第一电容C1上的电荷释放完毕,导致第二PNP管Q4断开,因此第一电感L1上的电流只能通过第一二极管D1流向第二储能电容Cr和负载RL,完成了磁能向电能的转换,从而实现了负半周期的能量提取。The energy harvesting principle of the circuit using the above structure is as follows: It is defined as a positive half cycle when the voltage of the first pin of the piezoelectric sheet U2 is higher than the voltage of the second pin. In the positive half cycle, the thermoelectric power generating sheet U1 supplies energy to the first storage The capacitor Ct is charged, the voltage difference between the first pin and the second pin of the piezoelectric sheet U2 gradually increases, and the second NPN tube Q3, the fourth diode D4, the first capacitor C1 and the piezoelectric sheet U2 A loop is formed, through which the piezoelectric sheet U2 charges the first capacitor C1, until the voltage difference between the first pin and the second pin of the piezoelectric sheet U2 reaches a peak value, the voltage difference begins to decrease, and then the voltage difference The voltage at the second pin of the electronic chip U2 begins to increase, but since the charge accumulated on the first capacitor C1 is not released in the loop, the base voltage of the first NPN transistor Q1 will be higher than the emitter voltage of the first NPN transistor Q1. Moreover, the voltage difference between the two will gradually increase until the voltage difference between the two is greater than the threshold voltage of the first NPN transistor Q1. At this time, the first NPN transistor Q1 is turned on, causing the first PNP transistor Q2 to be turned on. At the same time, since the voltage of the first pin of the piezoelectric sheet U2 is higher than the voltage of the second pin, the first pin of the piezoelectric sheet U2 is grounded through the second diode D2. Therefore, the piezoelectric sheet U2 and the second pin of the piezoelectric sheet U2 are grounded. The diode D2, the first inductor L1, the first energy storage capacitor Ct and the first PNP tube Q2 will form an LC oscillation circuit, and the LC oscillation circuit can convert the first capacitor through a quarter of an LC oscillation cycle. The charge accumulated on C1 is transferred to the first inductor L1, and the conversion from electrical energy to magnetic energy is completed at the same time; when the current on the first inductor L1 reaches the maximum value, the charge on the first capacitor C1 is released, resulting in the first PNP The tube Q2 is disconnected, so the current on the first inductor L1 can only flow to the second energy storage capacitor Cr and the load RL through the first diode D1, completing the conversion of magnetic energy to electrical energy, thereby realizing energy extraction in the positive half cycle. ;Define when the voltage of the first pin of the piezoelectric sheet U2 is lower than the voltage of the second pin, it is in the negative half cycle. In the negative half cycle, the thermoelectric power generating sheet U1 charges the first energy storage capacitor Ct, and the piezoelectric sheet U2 The voltage difference between the two ends gradually increases, and the first NPN tube Q1, the fifth diode D5, the first capacitor C1 and the piezoelectric sheet U2 form a loop. The piezoelectric sheet U2 charges the first capacitor C1 through the loop until the voltage is After the voltage difference across the piezoelectric piece U2 reaches the peak value, the voltage difference begins to decrease, and the voltage at the first pin of the piezoelectric piece U2 begins to increase. However, since the charge accumulated on the first capacitor C1 is not released in the loop, the second NPN transistor Q3 The base voltage of will be higher than the emitter voltage of the second NPN transistor Q3, and the voltage difference between the two will gradually become larger, until the voltage difference between the two is greater than the threshold voltage of the second NPN transistor Q3, at this time The second NPN transistor Q3 is turned on, causing the second PNP transistor Q4 to be turned on. At the same time, because the voltage of the first pin of the piezoelectric sheet U2 is lower than the voltage of the second pin, the second pin of the piezoelectric sheet U2 is turned on. The pin is connected to the ground through the third diode D3. Therefore, the piezoelectric piece U2, the third diode D3, the first inductor L1, the first energy storage capacitor Ct and the second PNP tube Q4 will form an LC oscillation circuit, and The LC oscillation circuit can transfer the charge accumulated on the first capacitor C1 to the first inductor L1 through a quarter of the LC oscillation cycle, and at the same time completes the conversion from electrical energy to magnetic energy. When the current on the first inductor L1 When reaching the maximum value, the charge on the first capacitor C1 is completely released, causing the second PNP transistor Q4 to be disconnected. Therefore, the current on the first inductor L1 can only flow to the second energy storage capacitor Cr and the load through the first diode D1. RL, completes the conversion of magnetic energy into electrical energy, thereby achieving negative half-cycle energy extraction.

Claims (2)

1.一种复合能量采集电路,其特征在于包括温差发电片、压电片、正负峰值检测模块、零电位切换模块、第一电感、第一二极管、第一储能电容、第二储能电容和负载,所述的正负峰值检测模块包括第一NPN管、第二NPN管、第一PNP管、第二PNP管、第四二极管、第五二极管和第一电容,所述的温差发电片的第1引脚、所述的第一储能电容的一端及所述的第一电感的一端连接,所述的第一电感的另一端、所述的第一二极管的正极、所述的第一PNP管的发射极及所述的第二PNP管的发射极连接,所述的第一二极管的负极、所述的第二储能电容的正极及所述的负载的一端连接,所述的第二PNP管的集电极、所述的第二NPN管的基极、所述的第五二极管的负极、所述的零电位切换模块的第一输入端及所述的压电片的第1引脚连接,所述的第一PNP管的集电极、所述的第一NPN管的基极、所述的第四二极管的负极、所述的零电位切换模块的第二输入端及所述的压电片的第2引脚连接,所述的第一PNP管的基极与所述的第一NPN管的集电极连接,所述的第二PNP管的基极与所述的第二NPN管的集电极连接,所述的第五二极管的正极、所述的第二NPN管的发射极及所述的第一电容的一端连接,所述的第一电容的另一端、所述的第四二极管的正极及所述的第一NPN管的发射极连接,所述的温差发电片的第2引脚、所述的第一储能电容的另一端、所述的第二储能电容的负极、所述的负载的另一端及所述的零电位切换模块的接地端均接地。1. A composite energy harvesting circuit, which is characterized by comprising a thermoelectric power generation piece, a piezoelectric piece, a positive and 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 load, the positive and negative peak detection module includes a first NPN tube, a second NPN tube, a first PNP tube, a second PNP tube, a fourth diode, a fifth diode and a first capacitor , the first pin of the thermoelectric power generation piece, 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 first two The anode of the diode, the emitter of the first PNP tube and the emitter of the second PNP tube are connected, the cathode of the first diode, the anode of the second energy storage capacitor and One end of the load is connected to the collector of the second PNP tube, the base of the second NPN tube, the cathode of the fifth diode, and the third terminal of the zero-potential switching module. An input terminal is connected to the first pin of the piezoelectric film, the collector of the first PNP tube, the base of the first NPN tube, the cathode of the fourth diode, The second input end of the zero-potential switching module is connected to the second pin of the piezoelectric sheet, and the base of the first PNP tube is connected to the collector of the first NPN tube, so The base of the second PNP tube is connected to the collector of the second NPN tube, the anode of the fifth diode, the emitter of the second NPN tube and the first capacitor One end is connected, the other end of the first capacitor, the anode of the fourth diode and the emitter of the first NPN tube are connected, the second pin of the thermoelectric power generation piece, the The other end of the first energy storage capacitor, the negative electrode of the second energy storage capacitor, the other end of the load and the ground end of the zero-potential switching module are all grounded. 2.根据权利要求1所述的一种复合能量采集电路,其特征在于所述的零电位切换模块包括第二二极管和第三二极管,所述的第二二极管的正极与所述的压电片的第1引脚连接,所述的第三二极管的正极与所述的压电片的第2引脚连接,所述的第二二极管的负极和所述的第三二极管的负极均接地。2. A composite energy harvesting circuit according to claim 1, characterized in that the zero-potential switching module includes a second diode and a third diode, and the anode of the second diode is connected to the anode of the second diode. The first pin of the piezoelectric sheet is connected, the anode of the third diode is connected to the second pin of the piezoelectric sheet, and the cathode of the second diode is connected to the cathode of the piezoelectric sheet. The cathodes of the third diodes are connected to ground.
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