WO2022130767A1 - 振動発電装置 - Google Patents
振動発電装置 Download PDFInfo
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- WO2022130767A1 WO2022130767A1 PCT/JP2021/038217 JP2021038217W WO2022130767A1 WO 2022130767 A1 WO2022130767 A1 WO 2022130767A1 JP 2021038217 W JP2021038217 W JP 2021038217W WO 2022130767 A1 WO2022130767 A1 WO 2022130767A1
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- 238000010248 power generation Methods 0.000 title claims abstract description 126
- 230000001133 acceleration Effects 0.000 claims abstract description 138
- 230000005540 biological transmission Effects 0.000 claims description 41
- 238000001514 detection method Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 description 34
- 238000010586 diagram Methods 0.000 description 17
- 230000000694 effects Effects 0.000 description 9
- 230000004048 modification Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/181—Circuits; Control arrangements or methods
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/001—Energy harvesting or scavenging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/06—Influence generators
- H02N1/08—Influence generators with conductive charge carrier, i.e. capacitor machines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
Definitions
- the present invention relates to a vibration power generator.
- a vibration power generation device whose power generation efficiency is improved by controlling the amplitude of the vibrating electrode of the vibration power generation element is known (see Patent Document 1).
- the vibration power generation device has a vibration power generation element that generates electric power corresponding to the vibration of an electrode, and when connected to a load resistance, the power generated by the vibration power generation element is converted into the load resistance. It includes an output unit to be supplied and an adjustment unit that adjusts the input impedance of the output unit according to a signal corresponding to the acceleration of the vibration.
- the present invention it is possible to increase the power generation efficiency of the vibration power generation device even when the vibration changes.
- FIG. 1 is a diagram showing an example of a configuration of a vibration power generation device connected to a load resistance to be fed.
- FIG. 2 is a diagram illustrating the relationship between the power value of the electric power generated by the vibration power generation element and the vibration acceleration of the vibration generator which is the vibration generation source.
- FIG. 3 is a diagram showing an example of a process for adjusting the input impedance of the output unit of the vibration power generation device, which is performed by the adjustment unit of the vibration power generation device.
- FIG. 4A is a diagram for explaining an example of a process for adjusting the input impedance of the output unit of the vibration power generation device, which is performed by the adjustment unit of the vibration power generation device.
- FIG. 1 is a diagram showing an example of a configuration of a vibration power generation device connected to a load resistance to be fed.
- FIG. 2 is a diagram illustrating the relationship between the power value of the electric power generated by the vibration power generation element and the vibration acceleration of the vibration generator which is the vibration generation source.
- FIG. 4B is another diagram for explaining an example of the process of adjusting the input impedance of the output unit of the vibration power generation device, which is performed by the adjustment unit of the vibration power generation device.
- FIG. 4C is another diagram for explaining an example of the process of adjusting the input impedance of the output unit of the vibration power generation device, which is performed by the adjustment unit of the vibration power generation device.
- FIG. 5 is a diagram showing a modified example of the configuration of the vibration power generation device connected to the load resistance to be fed.
- FIG. 6A is a diagram for explaining an example of a process for adjusting the input impedance of the output unit of the vibration power generation device, which is performed by the adjustment unit of the vibration power generation device according to the modified example.
- FIG. 6B is another diagram for explaining an example of the process of adjusting the input impedance of the output unit of the vibration power generation device, which is performed by the adjustment unit of the vibration power generation device according to the modified example.
- FIG. 6C is another diagram for explaining an example of the process of adjusting the input impedance of the output unit of the vibration power generation device, which is performed by the adjustment unit of the vibration power generation device according to the modified example.
- FIG. 1 is a diagram showing an example of the configuration of a vibration power generation device 100 connected to a load resistance 200 to be fed.
- the load resistance 200 can be, for example, a drive power source for driving detection by a sensor constituting the IOT and communication of the detection signal, but the form of the load resistance is not limited to this, of course.
- the vibration power generation device 100 loads the power generated by the vibration power generation element 110 that generates power according to the vibration of the electrode generated by the vibration of the vibration generator, the acceleration sensor 115 that detects the vibration acceleration of the electrode, and the vibration power generation element 110. It has an output unit 120 and an adjustment unit 130 that supply the resistor 200.
- the vibration power generation device 100 is installed in the vibration generation device 300 that causes vibration in the electrodes of the vibration power generation element 110.
- the vibration power generation element 110 has a fixed electrode and a movable electrode, and the vibration acceleration of the fixed electrode is a value corresponding to the vibration acceleration of the vibration generator 300 which is the vibration generation source.
- the vibration acceleration of the fixed electrode of the vibration power generation element 110 is set to a value equal to the vibration acceleration of the vibration generator 300.
- an arrow extending from the vibration power generation element 110 to the load resistance 200 via the output unit 120 indicates a power supply direction.
- the arrows extending from the acceleration sensor 115 and the adjusting unit 130 indicate the direction of control for adjusting the input impedance of the output unit 120, which will be described later.
- the acceleration sensor 115 is configured by, for example, a capacitance detection method and is installed in the vibration power generation element 110 to detect the vibration acceleration of the vibration generator 300.
- the signal corresponding to the detected vibration acceleration is transferred to the adjusting unit 130.
- the signal transferred from the acceleration sensor 115 to the adjusting unit 130 represents the vibration acceleration of the vibration generator 300 detected by the acceleration sensor 115.
- Such a signal can be said to be a signal corresponding to the vibration acceleration of the electrode of the vibration power generation element 110. Therefore, the signal transferred from the acceleration sensor 115 to the adjusting unit 130 represents a detected value related to the vibration acceleration of the electrode of the vibration power generation element 110.
- the adjusting unit 130 controls, for example, a comparator that determines whether or not the vibration acceleration of the vibration generator 300 is larger than a predetermined threshold value using a signal transferred from the acceleration sensor 115, and a switching operation of the switching circuit 122 described later.
- the input impedance of the output unit 120 is adjusted according to the determination result by the comparator including the control circuit.
- the output unit 120 includes a first power storage circuit 121, a switching circuit 122, and a second power storage circuit 123.
- the first storage circuit 121 is composed of, for example, a rectifier and a capacitor, and converts AC power output from the vibration power generation element 110 into DC power for storage.
- the switching circuit 122 is composed of, for example, a transistor, and performs a switching operation for starting or stopping power transmission from the first storage circuit 121 to the second storage circuit 123.
- the second storage circuit 123 is composed of, for example, an inductor and a capacitor, and converts and stores the voltage of the DC power transmitted from the first storage circuit 121 via the switching circuit 122.
- FIG. 2 is a diagram illustrating the relationship between the electric power P of the electric power generated by the vibration power generation element 110 and the vibration acceleration A detected by the acceleration sensor based on the vibration of the vibration generator 300 which is the vibration generation source. The above relationship is shown for each different input impedance of the output unit 120.
- the vertical axis of FIG. 2 shows the value of the electric power P, and the horizontal axis shows the value of the vibration acceleration.
- the input impedance refers to the ratio of the input voltage input to the output unit 120 to the inflowing input current, that is, the impedance of the input portion of the output unit 120 as seen from the vibration power generation element 110.
- the value of the input impedance is determined by the amount of electricity stored in the first storage circuit 121, and the amount of electricity stored is changed by switching the switching circuit 122.
- the vibration acceleration A of the vibration generator 300 increases from 0 and reaches Ax.
- the electric power Pz1 generated by the vibration power generation element 110 increases in proportion to the square of the vibration acceleration A. That is, the electric power P is expressed by the equation (1) using the proportionality coefficient C1.
- Pz1 C1 ⁇ A 2 (0 ⁇ A ⁇ Ax) ⁇ ⁇ ⁇ (1)
- FIG. 2 shows the inflection points X (Ax, Px) of the electric power Pz1.
- the electric power Pz1 shows an increase in proportion to the square of the vibration acceleration A in the vibration acceleration A ⁇ Ax until the vibration acceleration A> Ax. Then, when the vibration acceleration A> Ax, the electric power Pz1 becomes substantially flat from the electric power value Px at the inflection point X, or shows a gradual increase or a gradual decrease.
- the vibration acceleration A of the vibration generator 300 increases from 0 and reaches Ay.
- the electric power Pz2 generated by the vibration power generation element 110 increases in proportion to the square of the vibration acceleration A. That is, the electric power Pz2 is expressed by the equation (2) using the proportionality coefficient C2.
- Pz2 C2 ⁇ A 2 (0 ⁇ A ⁇ Ay) ⁇ ⁇ ⁇ (2)
- the variation point Y (Ay, Py) of Pz2 can be represented.
- the vibration acceleration A> Ay the power Pz2 tends to increase in proportion to the square of the vibration acceleration A at the vibration acceleration A ⁇ Ay, so that it is almost flat, gradually increasing or gradually decreasing from the power value Py at the turning point Y. It changes to the tendency to show.
- the proportional coefficient C2 used in the equation (2) is the proportionality used in the equation (1) as shown in FIG. It is smaller than the coefficient C1 and the power value Py at the turning point Y is larger than the power value Px at the turning point X.
- the input impedance Z of the output unit 120 is the first impedance value
- the input impedance Z of the output unit 120 is the second impedance value. Greater power P can be obtained.
- the vibration acceleration A of the vibration generator 300 is large, if the input impedance Z of the output unit 120 is the second impedance value, a larger power P is obtained than when the input impedance Z of the output unit 120 is the first impedance value. Be done.
- the adjusting unit 130 adjusts the input impedance Z of the output unit 120 as follows, as the details thereof will be described later in FIG.
- the vibration acceleration A of the vibration generator 300 is the first acceleration value A1 (0 ⁇ A1 ⁇ Ath) smaller than the predetermined threshold value Ath
- the adjusting unit 130 sets the input impedance Z of the output unit 120 to the first impedance value Z1.
- the vibration acceleration A of the electrode of the vibration power generation element 110 is the second acceleration value A2 (A2> Ath) larger than the predetermined threshold Ath
- the adjusting unit 130 changes the input impedance Z of the output unit 120 to the second impedance value Z2. adjust.
- the input impedance Z is the first impedance value Z1
- the electric power P when the vibration acceleration A is the third acceleration value A3 is, and when the input impedance Z is the second impedance value Z2, the vibration acceleration A is the third acceleration. It is equal to the power P when the value is A3.
- the electric power P at this time is the electric power value Px or a value close thereto.
- the adjusting unit 130 inputs the output unit 120.
- the impedance Z is changed from the first impedance value Z1 to the second impedance value Z2.
- the input impedance Z is changed from the second impedance value Z2 to the first impedance value Z1.
- a larger power P can be obtained than when it is assumed that the input impedance Z is not changed.
- the predetermined threshold value Ath is preset in the comparator included in the adjusting unit 130.
- the predetermined threshold value Ath is not limited to the third acceleration value A3, and other values in the vicinity of the third acceleration value A3 may be set, or a plurality of values in consideration of hysteresis may be used.
- the change of the input impedance value of the output unit 120 is realized by changing the condition for the switching circuit 122 to perform the power transmission switching operation based on the storage voltage of the first storage circuit 121. Such an operation will be described later with reference to FIGS. 4A, 4B and 4C.
- the change of the power-acceleration relationship between the two impedances Z1 and Z2 when the threshold Ath is the acceleration A3 has been described, but the vibration acceleration in a wider range depends on the corresponding vibration source. In some cases, it produces higher power. In such a case, the acceleration Ak (> A3) is set as the kth threshold value, and the power-acceleration relationship is changed between the two impedances Zm and Zn so that higher power is generated. May be good.
- FIG. 3 is a diagram showing an example of a process for adjusting the input impedance of the output unit 120 of the vibration power generation device 100, which is performed by the adjustment unit 130 of the vibration power generation device 100.
- This input impedance adjustment process is repeatedly executed, for example, according to the range of the detected vibration acceleration A while the vibration power generation device 100 is supplying electric power to the load resistance 200.
- step S310 the adjusting unit 130 determines whether or not the input impedance Z of the output unit 120 is the first impedance value Z1.
- the input impedance Z of the output unit 120 is the first impedance value Z1, and the process proceeds to step S320 corresponding to the first impedance value Z1.
- the input impedance Z of the output unit 120 is a second impedance value Z2 different from the first impedance value Z1, and the process proceeds to step S330 corresponding to the second impedance value Z2.
- step S320 the adjusting unit 130 determines whether or not the vibration acceleration A of the vibration generator 300 is larger than the predetermined threshold value Ath.
- a third acceleration value A3 is preset as a predetermined threshold value Ath.
- step S330 the adjusting unit 130 determines whether or not the vibration acceleration A of the vibration generator 300 is smaller than the predetermined threshold value Ath.
- a third acceleration value A3 is preset as a predetermined threshold value Ath.
- FIGS. 4A to 4C are diagrams for explaining an example of a process for adjusting the input impedance Z of the output unit 120 of the vibration power generation device 100, which is performed by the adjustment unit 130 of the vibration power generation device 100. That is, as described above in FIGS. 2 and 3, the adjusting unit 130 performs a process of changing the input impedance Z according to the vibration acceleration, and this impedance change is a direct current stored in the first power storage circuit 121. This is performed by switching the power transmission according to the value of the voltage V of the power. As described above, the adjusting unit 130 includes a control circuit that controls the switching operation of the switching circuit 122. As shown in FIG.
- the switching circuit 122 when the voltage V of the DC power stored in the first storage circuit 121 rises to a voltage value exceeding a predetermined voltage value Vth (V> Vth), the switching circuit 122 is controlled by the adjusting unit 130. According to this, the power transmission switching operation is performed. The state of the switching circuit 122 changes from off to on, and power transmission from the first storage circuit 121 to the second storage circuit 123 is started. As shown in FIG. 4B, when the voltage V of the DC power stored in the first storage circuit 121 drops to a voltage value lower than the predetermined voltage value Vth (V ⁇ Vth), the switching circuit 122 is controlled by the adjusting unit 130. According to this, the power transmission switching operation is performed. The state of the switching circuit 122 changes from on to off, and power transmission from the first power storage circuit 121 to the second power storage circuit 123 is stopped.
- the adjusting unit 130 changes the conditions under which the power transmission switching operation by the switching circuit 122 is performed when the input impedance Z is changed.
- the adjusting unit 130 changes the condition for switching the power transmission by the switching circuit 122 by changing the predetermined voltage value Vth described above.
- FIG. 4C is a diagram showing an adjustment process of the input impedance Z of the output unit 120 by the adjustment unit 130.
- step S410 the adjusting unit 130 determines whether or not to adjust the input impedance Z of the output unit 120 to the first impedance value Z1. If an affirmative determination is obtained, the process proceeds to step S420, and if a negative determination is obtained, the process proceeds to step S430.
- step S420 the adjusting unit 130 sets the predetermined voltage value Vth to the first voltage value V1.
- the predetermined voltage value Vth V1
- the input impedance Z of the output unit 120 becomes the first impedance value Z1.
- step S420 the adjustment process of the input impedance Z of the output unit 120 is completed.
- step S430 the adjusting unit 130 sets the predetermined voltage value Vth to the second voltage value V2, which is larger than the first voltage value V1.
- the predetermined voltage value Vth V2
- the input impedance Z of the output unit 120 becomes the second impedance value Z2.
- step S430 the adjustment process of the input impedance Z of the output unit 120 is completed.
- the process shown in FIG. 4C has the following relationship with the process shown in FIG. Steps S410 and S420 of FIG. 4C correspond to step S335 of FIG. 3, and steps S410 and S430 correspond to step S325 of FIG.
- the vibration power generation device 100 When the vibration power generation device 100 is connected to the vibration power generation element 110 that generates electric power corresponding to the vibration of the electrode and the load resistance 200, the power generated by the vibration power generation element 110 is supplied to the load resistance 200.
- the output unit 120 and the adjustment unit 130 are included.
- the adjusting unit 130 adjusts the input impedance Z of the output unit 120 according to the signal transferred from the acceleration sensor 115.
- the signal transferred from the acceleration sensor 115 to the adjusting unit 130 is a signal representing the vibration acceleration A of the vibration generator 300 detected by the acceleration sensor 115, that is, corresponds to the vibration acceleration of the vibration of the electrode of the vibration power generation element 110. It is a signal.
- the power P supplied to the load resistance 200 by the output unit 120 of the vibration power generation device 100 can be changed according to the vibration acceleration of the vibration of the electrode of the vibration power generation element 110, and the power generation efficiency of the vibration power generation device 100 can be changed. The effect of being able to increase is obtained.
- the signal transferred from the acceleration sensor 115 to the adjusting unit 130 represents a detection value related to the vibration acceleration of the vibration of the electrode of the vibration power generation element 110 detected by the acceleration sensor 115.
- the detected value is the value of the vibration acceleration A of the vibration generator 300.
- the vibration acceleration A changes from the second acceleration value A2 to the first acceleration value A1
- the input impedance Z is changed from the second impedance value Z2 to the first impedance value Z1. Therefore, the electric power P supplied to the load resistance 200 by the output unit 120 of the vibration power generation device 100 has a larger electric power value regardless of whether the vibration acceleration A of the vibration generator 300 is small or large. The effect that the electric power P can be changed can be obtained.
- the acceleration sensor 115 is installed in the vibration power generation element 110. Therefore, it is possible to obtain the effect that the accuracy of the vibration acceleration represented by the signal transferred from the acceleration sensor 115 to the adjusting unit 130 is high.
- the load resistance is increased by the output unit 120.
- the predetermined threshold Ath is the third acceleration value. Equal to A3. Therefore, there is an effect that a relatively high electric power P can be supplied to the load resistance 200 by the output unit 120 according to the vibration acceleration A of the vibration of the electrode.
- the output unit 120 converts the AC power output from the vibration power generation element 110 into DC power and stores the first storage circuit 121, and converts the voltage of the DC power into storage. It has a second power storage circuit 123, and a switching circuit 122 that performs a switching operation to start or stop power transmission from the first power storage circuit 121 to the second power storage circuit 123.
- the adjusting unit 130 adjusts the input impedance Z of the output unit 120 by changing the conditions under which the power transmission switching operation controlled by the control circuit included in the adjusting unit 130 is performed. The effect that the input impedance Z of the output unit 120 can be adjusted without the need to make a special change to the circuit configuration of the conventional output unit 120 can be obtained.
- the switching circuit 122 performs a switching operation of power transmission.
- the control circuit included in the adjusting unit 130 can change the conditions under which the power transmission switching operation is performed by the switching circuit 122 by changing the predetermined voltage value Vth. In this case, the effect that the control circuit can be configured by a relatively simple circuit can be obtained.
- the acceleration sensor 115 of the vibration power generation device 100 is configured by a capacitance detection method and is installed in the vibration power generation element 110 included in the vibration power generation device 100.
- the acceleration sensor 115 is not limited to the capacitance detection method, and may be configured by another method. Further, it is not always installed in the vibration power generation element 110.
- the acceleration sensor 115 may be installed in a vibration generator 300, which is a vibration source that causes vibration in the electrode of the vibration power generation element 110, outside the vibration power generation device 100.
- the acceleration sensor 115 generates vibration as a signal corresponding to the vibration acceleration of the electrode of the vibration power generation element 110 regardless of whether it is installed in the vibration power generation element 110 or the vibration generation device 300.
- a signal representing the vibration acceleration A of the vibration generated in the device 300 and acting on the vibration power generation element 110 may be used.
- the detected value detected by the acceleration sensor 115 represents the vibration acceleration A of the vibration generated by the vibration generator 300, but since the vibration generated by the vibration generator 300 is related to the vibration of the electrode of the vibration power generation element 110, the detected value. Is a value related to the vibration acceleration of the electrode of the vibration power generation element 110. Therefore, as a signal corresponding to the vibration acceleration of the electrode of the vibration power generation element 110, a signal representing the vibration acceleration A of the vibration generated by the vibration generator 300 detected by the acceleration sensor 115 is used.
- the adjusting unit 130 of the vibration power generation device 100 represents the vibration acceleration A of the vibration generated by the vibration generation device 300 as a signal corresponding to the vibration acceleration of the electrode of the vibration power generation element 110.
- the adjusting unit 130 may adjust the input impedance Z of the output unit 120 according to another signal obtained by the vibration generating device 300, which is a vibration generating source that causes vibration in the electrode of the vibration power generation element 110.
- the adjusting unit 130 of the vibration power generator 100 is, for example, an operating state of a vibration switch (not shown) that operates according to the output level of the vibration generator 300, or a timer (not shown) that starts or stops the operation of the vibration generator 300.
- a vibration switch not shown
- a timer not shown
- the operating state it is possible to acquire a signal representing the output level of the vibration generator 300. Since the vibration acceleration of the electrode of the vibration power generation element 110 depends on the output level of the vibration generator 300, the signal representing the output level of the vibration generator 300 is a signal corresponding to the vibration acceleration of the electrode. The higher the value of this output level, the larger the vibration acceleration.
- the adjusting unit 130 of the vibration power generation device 100 changes the input impedance Z of the output unit 120 from the first impedance value Z1 to the first impedance value Z1. Change to the second impedance value Z2, which is larger than the 1 impedance value Z1.
- the adjusting unit 130 of the vibration power generation device 100 changes the input impedance Z of the output unit 120 from the second impedance value Z2 to the first impedance value Z1. In this way, by setting the threshold value of the vibration acceleration instead of switching between the output levels of "LOW" and "HIGH", the input impedance can be changed according to the above-mentioned output level.
- the output level of the vibration generator 300 may be detected based on the change in the operating state of the compressor included in the vibration generator 300. For example, when the compressor is started, it is detected that the vibration generator 300 output level is HIGH level, and when the compressor is stopped, it is detected that the vibration generator 300 output level is LOW level. ..
- the signal used by the adjustment unit 130 to adjust the input impedance Z of the output unit 120 is a vibration generation device that causes vibration according to the vibration acceleration A to be generated in the electrode of the vibration power generation element 110.
- the adjusting unit 130 changes the input impedance Z from the first impedance value Z1 to the second impedance value larger than the first impedance value Z1. Change to Z2.
- the adjusting unit 130 changes the input impedance Z from the second impedance value Z2 to the first impedance value Z1. Therefore, it is not necessary to provide the acceleration sensor 115 in the vibration power generation device 100, the vibration power generation device 100 can be miniaturized, and the power required to drive the acceleration sensor 115 can be reduced.
- two types of impedance values including a first impedance value Z1 and a second impedance value Z2 can be set for the input impedance Z of the output unit 120 of the vibration power generation device 100.
- the input impedance Z of the output unit 120 may be set with a plurality of types of impedance values more than two types.
- the plurality of types of impedance values may be set values that can be continuously changed.
- the condition for switching the power transmission by the switching circuit 122 included in the output unit 120 of the vibration power generation device 100 is the voltage V of the DC power stored in the first power storage circuit 121. It depends on the relationship between the predetermined voltage value Vth and the predetermined voltage value Vth, and by changing the predetermined voltage value Vth, the conditions under which the switching operation of the power transmission is performed are changed. However, the switching circuit 122 periodically repeats the switching operation of the power transmission, and the time from the start to the stop of the power transmission and the time from the stop to the start of the power transmission are set. By changing the duty ratio based on the control circuit included in the adjusting unit 130, the conditions under which the power transmission switching operation is performed may be changed.
- FIG. 6A, 6B and 6C are for explaining an example of the process of adjusting the input impedance Z of the output unit 120 of the vibration power generation device 100, which is performed by the adjustment unit 130 of the vibration power generation device 100 according to the modification (4). It is a figure of.
- This input impedance adjustment process is performed by the adjustment unit 130 of the vibration power generation device 100 in this modification.
- the adjusting unit 130 includes a control circuit that controls the switching operation of the switching circuit 122.
- the switching circuit 122 has a switching operation that changes from an off state to an on state and a switching operation that changes from an on state to an off state in chronological order according to the control by the adjusting unit 130. And are periodically repeated in the cycle T.
- the adjusting unit 130 has a power transmission time from the start to the stop of the power transmission from the first power storage circuit 121 to the second power storage circuit 123, and the time from the stop to the start of the power transmission.
- the duty ratio D is changed from h1 / T based on the equation (3) to a value h2 / T based on the equation (4), which is a smaller value thereof, so that the output unit 120
- the input impedance Z of is changed from the first impedance value Z1 to the second impedance value Z2 larger than the first impedance value Z1.
- the adjusting unit 130 changes the condition for switching the power transmission by the switching circuit 122 depending on whether or not the vibration acceleration A of the vibration generator 300 is larger than the predetermined threshold value Ath.
- the adjusting unit 130 changes the condition for switching the power transmission by the switching circuit 122 by changing the duty ratio D described above, and by changing the condition, the output unit 120 Adjust the input impedance Z.
- FIG. 6C is a diagram showing the adjustment process of the input impedance Z by the adjustment unit 130.
- the control circuit included in the adjusting unit 130 is obtained by repeatedly switching the power transmission by the switching circuit 122, from the start to the stop of the power transmission.
- the conditions under which the power transmission switching operation is performed by the switching circuit 122 can be changed. Can be done.
- the effect that the control circuit can easily control the switching operation of the power transmission by the switching circuit 122 can be obtained. Further, since it is not necessary to measure the voltage V of the DC power stored in the first power storage circuit 121, it is possible to obtain the effect of preventing the current loss associated with the measurement.
- the present invention is not limited to the above-described embodiments and configurations in each modification as long as the characteristic functions of the present invention are not impaired.
- vibration power generator 110 vibration power generator, 115 accelerometer, 120 output unit, 121 first power storage circuit, 122 switching circuit, 123 2nd power storage circuit, 130 adjuster, 200 load resistance, 300 vibration generator
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Abstract
Description
Pz1=C1×A2 (0≦A≦Ax) ・・・(1)
Pz2=C2×A2 (0≦A≦Ay) ・・・(2)
D=h1/T ・・・(3)
D=h2/T ・・・(4)
120 出力部、121 第1蓄電回路、122 スイッチング回路、
123 第2蓄電回路、130 調整部、200 負荷抵抗、
300 振動発生装置
Claims (8)
- 電極の振動に応じた電力を生成する振動発電素子と、
負荷抵抗に接続されると、前記振動発電素子によって生成された電力を前記負荷抵抗に供給する出力部と、
前記振動の加速度に対応する信号に応じて前記出力部の入力インピーダンスを調整する調整部と、を備える、振動発電装置。 - 請求項1に記載の振動発電装置において、
前記信号は、加速度センサによって検出された、前記加速度に関連する検出値を表し、
前記調整部は、
前記加速度が所定閾値よりも小さい第1加速度値から前記所定閾値よりも大きい第2加速度値へ変化すると、前記入力インピーダンスを第1インピーダンス値から前記第1インピーダンス値よりも大きい第2インピーダンス値へ変更し、
前記加速度が前記第2加速度値から前記第1加速度値へ変化すると、前記入力インピーダンスを前記第2インピーダンス値から前記第1インピーダンス値へ変更する、振動発電装置。 - 請求項2に記載の振動発電装置において、
前記加速度センサは、前記振動発電素子に設置される、振動発電装置。 - 請求項2または3に記載の振動発電装置において、
前記入力インピーダンスが前記第1インピーダンス値である場合に前記加速度が第3加速度値であるときの前記電力と、前記入力インピーダンスが前記第2インピーダンス値である場合に前記加速度が前記第3加速度値であるときの前記電力とが等しいとき、前記所定閾値は前記第3加速度値に基づいて得られる、振動発電装置。 - 請求項1に記載の振動発電装置において、
前記信号は、前記加速度に応じた前記振動を前記電極に生じさせる振動発生装置の出力レベルを表し、
前記調整部は、
前記出力レベルが第1レベルから前記第1レベルよりも大きい第2レベルへ変化すると、前記入力インピーダンスを、第1インピーダンス値から前記第1インピーダンス値よりも大きい第2インピーダンス値へ変更し、
前記出力レベルが前記第2レベルから前記第1レベルへ変化すると、前記入力インピーダンスを、前記第2インピーダンス値から前記第1インピーダンス値へ変更する、振動発電装置。 - 請求項1から請求項5までのいずれか一項に記載の振動発電装置において、
前記出力部は、
前記振動発電素子から出力される交流電力を直流電力に変換して蓄電する第1蓄電回路と、
前記直流電力の電圧を変換して蓄電する第2蓄電回路と、
前記第1蓄電回路から前記第2蓄電回路への電力伝送を開始または停止する切替動作を行うスイッチング回路と、を有し、
前記調整部は、前記切替動作が行われる条件を変更することによって、前記入力インピーダンスを調整する、振動発電装置。 - 請求項6に記載の振動発電装置において、
前記第1蓄電回路に蓄電される前記直流電力の電圧が、所定電圧値を上回る電圧値に上昇したとき、または前記所定電圧値を下回る電圧値に低下したとき、前記スイッチング回路によって前記切替動作が行われ、
前記調整部は、前記所定電圧値を変更することによって、前記切替動作が行われる前記条件を変更する、振動発電装置。 - 請求項6に記載の振動発電装置において、
前記調整部は、前記切替動作が繰り返し行われることにより得られる、前記電力伝送が開始されてから停止されるまでの時間と、前記電力伝送が停止されてから開始されるまでの時間とに基づくデューティ比を、変更することによって、前記切替動作が行われる前記条件を変更する、振動発電装置。
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