CN111308320B - Living tree bioelectricity circuit model and determination method of parameters of elements of living tree bioelectricity circuit model - Google Patents
Living tree bioelectricity circuit model and determination method of parameters of elements of living tree bioelectricity circuit model Download PDFInfo
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- CN111308320B CN111308320B CN202010146279.XA CN202010146279A CN111308320B CN 111308320 B CN111308320 B CN 111308320B CN 202010146279 A CN202010146279 A CN 202010146279A CN 111308320 B CN111308320 B CN 111308320B
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Abstract
The invention relates to a living wood bioelectricity circuit model and a method for determining parameters of each element of the living wood bioelectricity circuit model, which are technically characterized in that: comprises a first current source I1, a second current source I2, a third current source I3, a first resistor R0, a second resistor R1 and a voltage source V1; the first current source I1 is connected in parallel with a second current source I2; the circuit formed by the first current source I1 and the second current source I2 is connected in series with a first resistor R0, and the first resistor R0 is connected with the anode of the first current source I1; the circuit formed by the first current source I1, the second current source I2 and the first resistor R0 is connected in parallel with the third current source I3; the second resistor R1 is connected with a voltage source V1 in series; the circuit formed by the second resistor R1 and the voltage source V1 is connected in parallel with the third current source I3, and the negative electrode of the voltage source V1 is connected with the negative electrode of the first current source I1. The invention can simulate the change characteristics of the live stumpage bioelectricity voltage, including seasonal changes and day-night changes.
Description
Technical Field
The invention belongs to the technical field of bioelectric energy collection, relates to an equivalent circuit of a living tree bioelectric power supply, and particularly relates to a living tree bioelectric circuit model and a method for determining parameters of each element of the living tree bioelectric circuit model.
Background
The metal electrodes are respectively arranged in the trunks of the standing trees and the growing soil of the trunks, or the metal electrodes are respectively arranged at different positions of the trunks, and the continuous and variable potential difference can be measured between the electrodes. The generation mechanism of the bioelectricity is controversial, but the application prospect of the bioelectricity is widely concerned. On one hand, the change of the potential difference is periodic and possibly related to the physiological activity of the standing trees, so that a new thought is provided for the research of a novel physiological parameter measuring method; on the other hand, the bioelectricity has certain driving capability, and if the bioelectricity can be collected and stored, a brand-new power supply scheme can be provided for agricultural and forestry low-power-consumption electric equipment.
Researches show that the voltage of the live stumpage bioelectricity is periodically changed in year and day and night, and has different amplitudes at different moments and different seasons, thereby bringing certain difficulty to the application of the live stumpage bioelectricity. Taking energy collection as an example, the voltage variation range and variation characteristic of the energy source need to be determined, so that an efficient and reliable energy collection circuit can be designed. On the other hand, when testing the energy collection circuit, it is necessary to perform the test at different stages of the variation of the energy source voltage. If the equivalent circuit model of the living tree biological power supply can be provided, the model can be used for completing a quick test in a circuit simulation tool, and the development period of an energy collecting circuit is shortened. The current widely applied circuit model is mainly formed by connecting an ideal voltage source and an internal resistance in series, and the change range and the change characteristic of the live stumpage bioelectricity are not conveniently reflected. Therefore, the research on the circuit model capable of completely presenting the variation of the live stumpage bioelectric voltage season and day and night is significant.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a live stumpage bioelectricity circuit model which can completely present the variation of live stumpage bioelectricity in seasons and day and night.
The invention solves the practical problem by adopting the following technical scheme:
a live wood bioelectricity circuit model comprises a first current source I1, a second current source I2, a third current source I3, a first resistor R0, a second resistor R1 and a voltage source V1;
the first current source I1 is connected in parallel with a second current source I2; the circuit formed by the first current source I1 and the second current source I2 is connected in series with a first resistor R0, and the first resistor R0 is connected with the anode of the first current source I1; the circuit formed by the first current source I1, the second current source I2 and the first resistor R0 is connected with the third current source I3 in parallel; the second resistor R1 is connected with a voltage source V1 in series; the circuit formed by the second resistor R1 and the voltage source V1 is connected in parallel with the third current source I3, and the negative electrode of the voltage source V1 is connected with the negative electrode of the first current source I1.
Both ends of the circuit formed by the second resistor R1 and the voltage source V1 are voltage output terminals.
Moreover, the first current source I1 is a constant current source, the second current source I2 is a sinusoidal current source, the third current source I3 is a square wave current source, the second resistor R1 is a voltage-controlled resistor, the control signal of the second resistor R1 is provided by the voltage at both ends of the first resistor R0, and the voltage source V1 is a constant voltage source.
Furthermore, the frequency of the third current source I3 is 365 times the frequency of the second current source I2.
A method for determining parameters of each element of a living tree bioelectricity circuit model comprises the following steps:
s1, determining the voltage of a voltage source V1 according to the annual lowest value of the bioelectrical voltage of the standing trees;
s2, determining the resistance value of the first resistor R0 according to the annual variation range of the internal resistance of the live stumpage bioelectricity equivalent power supply;
s3, determining the resistance value change range of the second resistor R1 according to the annual change range of the internal resistance of the live stumpage bioelectricity equivalent power supply and the resistance value of the first resistor R0;
s4, determining the current of a third current source I3 according to the day and night variation range of the bioelectrical voltage of the standing trees and the resistance value of the second resistor R1;
and S5, determining the current of the first current source I1, the current of the second current source I2 and the control coefficient of the second resistor R1 according to the annual maximum value of the bioelectrical voltage of the standing trees, the current of the third current source I3, the voltage of the voltage source V1 and the maximum resistance value and the minimum resistance value of the second resistor R1.
The invention has the advantages and beneficial effects that:
1. the current widely applied circuit model is mainly formed by connecting an ideal voltage source and an internal resistance in series, and the change range and the change characteristic of the live stumpage bioelectricity are not conveniently reflected. The invention can simulate the complete change characteristics of the live stumpage bioelectricity voltage, including seasonal change and day-night change. The circuit model provides a constant component, a seasonal change component and a day-night change component of the live stumpage biological power supply output signal by utilizing a first current source I1, a second current source I2 and a third current source I3 respectively. By utilizing the model, the annual change characteristic of the output signal of the live stumpage biological power supply can be rapidly simulated in a circuit simulation tool, and the development and test period of the biological electric energy collecting circuit is shortened;
2. according to the method for determining the element parameters, provided by the invention, the circuit model provided by the invention can be used for different tree species.
Drawings
FIG. 1 is a diagram of a bioelectrical circuit model of living trees according to the present invention;
FIG. 2 is a graph of typical annual variation characteristics of live stumpage bioelectric voltage in accordance with the present invention;
FIG. 3 is a graph showing typical diurnal variation characteristics of the live stumpage bioelectric voltage in four seasons of spring, summer, autumn and winter according to the present invention;
FIG. 4 is a graph of the time-varying characteristic of the live wood bioelectric voltage simulated by the live wood bioelectric circuit model according to the embodiment of the present invention;
FIG. 5 is a graph of the diurnal variation characteristic of the live stumpage bioelectric voltage simulated by the live stumpage bioelectric circuit model in an embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in further detail below with reference to the accompanying drawings:
a live wood bioelectrical circuit model is shown in FIG. 1, and comprises a first current source I1, a second current source I2, a third current source I3, a first resistor R0, a second resistor R1 and a voltage source V1;
the first current source I1 is connected in parallel with a second current source I2; the circuit formed by the first current source I1 and the second current source I2 is connected in series with a first resistor R0, and the first resistor R0 is connected with the anode of the first current source I1; the circuit formed by the first current source I1, the second current source I2 and the first resistor R0 is connected in parallel with the third current source I3; the second resistor R1 is connected with a voltage source V1 in series; the circuit formed by the second resistor R1 and the voltage source V1 is connected in parallel with the third current source I3, and the negative electrode of the voltage source V1 is connected with the negative electrode of the first current source I1.
In this embodiment, the two terminals a and b of the circuit formed by the second resistor R1 and the voltage source V1 are voltage output terminals, where the terminal b is used as the reference ground of the circuit model.
In this embodiment, the first current source I1 is a constant current source, the second current source I2 is a sinusoidal current source, the third current source I3 is a square wave current source, the second resistor R1 is a voltage-controlled resistor, the control signal of the second resistor R1 is provided by the voltage across the first resistor R0, and the voltage source V1 is a constant voltage source.
In the present embodiment, the frequency of the third current source I3 is 365 times the frequency of the second current source I2.
In the embodiment, the bioelectric voltage of the standing tree is periodically changed in an annual way and in a day and night way. Thus, the voltage can be decomposed into three components: constant component, cycle component with a cycle of 1 year, cycle component with a cycle of 1 day.
In the present embodiment, the first current source I1 is used to provide a constant component, the second current source I2 is used to provide a periodic component with a period of 1 year, and the third current source I3 is used to provide a periodic component with a period of 1 day.
Fig. 2 is a typical annual variation characteristic of the bioelectric voltage of the standing tree, and fig. 3 is a typical diurnal variation characteristic of the bioelectric voltage of the standing tree. As shown in fig. 2 and 3, the live stumpage bioelectric voltage has a high amplitude in spring and summer, and changes significantly in day and night, but in autumn and winter. The annual voltage change can be approximate to a sine quantity, but the bottom of the voltage has an amplitude limiting characteristic; the diurnal variation in voltage may approximate a square wave.
Therefore, in the present embodiment, the second current source I2 is a sinusoidal current source, and the third current source I3 is a square wave current source, which are respectively used for representing the annual variation characteristic and the diurnal variation characteristic of the live stump bioelectric voltage. The voltage source V1 can make the output voltage higher than a constant value constantly, and is used for showing the amplitude limiting characteristic of the live stumpage bioelectric voltage. The second resistor R1 is a voltage controlled resistor whose control signal is provided by the voltage across the first resistor R0. When the current of the second current source I2 is increased, the voltage at two ends of the first resistor R0 is increased, the resistance value of the second resistor R1 is increased, the effect of the third current source I3 on the second resistor R1 is enhanced, and otherwise, the effect is weakened, so that the difference of day-night variation of the bioelectricity voltage of the standing trees in different seasons is reflected. The sum of the voltage across the second resistor R1 and the voltage across the voltage source V1 constitutes the output voltage of the circuit.
A method for determining parameters of each element of a living tree bioelectricity circuit model comprises the following steps:
s1, determining the voltage of a voltage source V1 according to the annual lowest value of the bioelectrical voltage of the standing trees;
s2, determining the resistance value of the first resistor R0 according to the annual variation range of the internal resistance of the live stumpage bioelectricity equivalent power supply;
s3, determining the resistance value change range of the second resistor R1 according to the annual change range of the internal resistance of the live stumpage bioelectricity equivalent power supply and the resistance value of the first resistor R0;
s4, determining the current of a third current source I3 according to the day and night variation range of the bioelectrical voltage of the standing trees and the resistance value of the second resistor R1;
and S5, determining the current of the first current source I1, the current of the second current source I2 and the control coefficient of the second resistor R1 according to the annual maximum value of the bioelectrical voltage of the standing trees, the current of the third current source I3, the voltage of the voltage source V1 and the maximum resistance value and the minimum resistance value of the second resistor R1.
The method for calculating the parameters of each circuit element of the circuit model according to the present invention will be described below with reference to specific examples.
As shown in FIG. 2, the annual minimum value of the bioelectric voltage of the standing trees in this embodiment is about 600mV, which is used as the voltage of the voltage source V1, so that the output voltage of the model is constantly greater than 600 mV.
Because the internal resistance of the standing tree bioelectricity equivalent power supply in the embodiment is between 2k Ω and 5k Ω, and meanwhile, the equivalent internal resistance of the circuit model in the embodiment is the parallel connection of the first resistor R0 and the second resistor R1, 2 times of the maximum value of the internal resistance of the standing tree bioelectricity equivalent power supply can be taken as the resistance value of the first resistor R0, namely 10k Ω.
The resistance value of the parallel equivalent resistor of R0 and R1 is between 2k omega and 5k omega, namely
The resistance of the second resistor R1 can thus be calculated to be between 2.5k omega and 10k omega.
As shown in figure 3, in summer, the diurnal variation of the bioelectric voltage of the standing tree is obvious, and the range is between 200mV and 300mV, which can be approximately 240 mV. Meanwhile, the resistance change frequency of the second resistor R1 is the same as the current change frequency of the second current source I2, and is 1/365 times of the current change frequency of the third current source I3. Therefore, the action of the third current source I3 on the second resistor R1 represents the diurnal variation of the bioelectrical voltage of the standing trees. The resistance of the second resistor R1 is now large, and can be approximated to a maximum value of 10k Ω. The above relationship can be expressed as
The current of the third current source I3 can thus be calculated to be ± 12 μ a.
Assume that the control coefficient of the second resistor R1 is
When the current of the second current source I2 is maximum in the forward direction, the resistance of the second resistor R1 is at a maximum of
When the current of the second current source I2 is reversed to the maximum, the resistance of the second resistor R1 reaches the minimum value of
As shown in FIG. 2, the annual maximum value of the bioelectric voltage of the standing tree is about 1200mV
(I1+I2+I3)×R1+V1＝1200mV。
At this time, the currents of the second current source I2 and the third current source I3 are both maximum in the forward direction, and the resistance value of the second resistor R1 is also maximum, that is, the resistance value is maximum
I3＝12μA，
R1＝10kΩ。
By combining the above 5 equations, the current of the first current source I1, the current of the second current source I2, and the control coefficient of the second resistor R1 can be calculated as
Since the live stumpage bioelectric voltage changes all the year around and has the bottom amplitude limiting characteristic, the current value of the first current source I1 can be properly reduced, and 28 muA is adopted in the embodiment.
Fig. 4 is the annual variation characteristic of the bioelectric voltage of the living standing tree simulated by the circuit model of the embodiment. FIG. 5 is a diagram showing the behavior of the circuit model of the present embodiment in simulating the diurnal variation of the bioelectric voltage of standing trees. Comparing fig. 2, fig. 3, fig. 4 and fig. 5, the output characteristic of the circuit model of the present embodiment is similar to the variation characteristic of the bioelectric voltage of the actual standing tree.
It should be emphasized that the examples described herein are illustrative and not restrictive, and thus the present invention includes, but is not limited to, those examples described in this detailed description, as well as other embodiments that can be derived from the teachings of the present invention by those skilled in the art and that are within the scope of the present invention.
Claims (2)
1. The utility model provides a living standing tree bioelectricity circuit model which characterized in that: comprises a first current source I1, a second current source I2, a third current source I3, a first resistor R0, a second resistor R1 and a voltage source V1;
the first current source I1 is connected in parallel with a second current source I2; the circuit formed by the first current source I1 and the second current source I2 is connected in series with a first resistor R0, and the first resistor R0 is connected with the anode of the first current source I1; the circuit formed by the first current source I1, the second current source I2 and the first resistor R0 is connected with the third current source I3 in parallel; the second resistor R1 is connected with a voltage source V1 in series; the circuit formed by the second resistor R1 and the voltage source V1 is connected with the third current source I3 in parallel, and the negative electrode of the voltage source V1 is connected with the negative electrode of the first current source I1;
the two ends of the circuit formed by the second resistor R1 and the voltage source V1 are voltage output ends;
the first current source I1 is a constant current source, the second current source I2 is a sinusoidal current source, the third current source I3 is a square wave current source, the second resistor R1 is a voltage-controlled resistor, a control signal of the second resistor R1 is provided by the voltage at two ends of the first resistor R0, and the voltage source V1 is a constant voltage source;
the frequency of the third current source I3 is 365 times the frequency of the second current source I2.
2. A method of determining parameters of components of a living tree bioelectrical circuit model according to claim 1, characterized by: the method comprises the following steps:
s1, determining the voltage of a voltage source V1 according to the annual lowest value of the bioelectrical voltage of the standing trees;
s2, determining the resistance value of the first resistor R0 according to the annual variation range of the internal resistance of the live stumpage bioelectricity equivalent power supply;
s3, determining the resistance value change range of the second resistor R1 according to the annual change range of the internal resistance of the live stumpage bioelectricity equivalent power supply and the resistance value of the first resistor R0;
s4, determining the current of a third current source I3 according to the day and night variation range of the bioelectrical voltage of the standing trees and the resistance value of the second resistor R1;
and S5, determining the current of the first current source I1, the current of the second current source I2 and the control coefficient of the second resistor R1 according to the annual maximum value of the bioelectrical voltage of the standing trees, the current of the third current source I3, the voltage of the voltage source V1 and the maximum resistance value and the minimum resistance value of the second resistor R1.
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| JP3795193B2 (en) * | 1997-07-31 | 2006-07-12 | 旭化成マイクロシステム株式会社 | Current source circuit and operational amplifier circuit |
| CN103326430B (en) * | 2013-06-13 | 2015-04-15 | 北京林业大学 | Standing tree environment energy harvesting method |
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