Light intensity adjusting device and solar charging equipment

Abstract

The invention discloses a light intensity adjusting device for a photovoltaic panel and solar charging equipment. The light intensity adjusting device comprises a light condensation assembly, a main control module and a displacement mechanism. The light condensation assembly comprises a first optical element and a second optical element, the first optical element and the second optical element are arranged on one side of the light incidence face of the photovoltaic panel in a stacked mode, the displacement mechanism is connected with the first optical element and the second optical element, and the main control module is used for obtaining the current output power of the photovoltaic panel in real time. When the current output power is lower than the preset output power, the displacement mechanism is controlled to drive at least one of the first optical element and the second optical element to displace so as to adjust the relative position of the first optical element and the second optical element; in this way, at least part of light entering the overlapped area of the first optical element and the second optical element is converged and emitted to the photovoltaic panel, and the intensity of light entering the photovoltaic panel can be improved under the condition that ambient light is insufficient.

Description

Technical Field

[0001] The present invention relates to the field of solar charging technology, and in particular to a light intensity adjustment device and a solar charging device. Background Art

[0002] With the rapid development of renewable energy technology, portable solar charging panels, as an efficient and environmentally friendly energy device, are gradually entering people's daily lives. Portable solar charging panels, also known as solar mobile power sources, are widely used in emergency rescue, agriculture, outdoor adventures, household appliances, etc. By installing solar charging panels on the applied carriers, such as mobile phones, cameras, street lights or outdoor billboards, the carriers can be directly powered or charged. In the prior art, photovoltaic panels, as key components of solar charging panels, are used to convert light energy into electrical energy. The output power of photovoltaic panels is related to the light intensity. When the light intensity is lower than a certain threshold, the photovoltaic panels do not output electricity, that is, when the light intensity is insufficient, the solar charging panels stop working and cannot continue to power or charge the carriers. Their application is limited in scenes or time periods with insufficient light. Summary of the invention

[0003] The embodiments of the present invention provide a light intensity adjustment device and a solar charging device, which can increase the light intensity incident on a photovoltaic panel when the ambient light is insufficient, thereby extending the use time of the solar charging device.

[0004] In order to achieve the above-mentioned object, an embodiment of the present invention provides a light intensity adjustment device for a photovoltaic panel, comprising a focusing component, a main control module and a displacement mechanism;

[0005] The focusing assembly includes a first optical element and a second optical element, which are stacked on one side of the light incident surface of the photovoltaic panel, and an air barrier is provided between the first optical element and the second optical element. The displacement mechanism is respectively connected to the first optical element and the second optical element. The main control module is used to obtain the current output power of the photovoltaic panel in real time, and when the current output power is lower than the preset output power, the main control module drives at least one of the first optical element and the second optical element to move by controlling the displacement mechanism to adjust the relative positions of the first optical element and the second optical element, so that at least part of the light incident on the overlapping area of ​​the first optical element and the second optical element is converged and emitted to the photovoltaic panel.

[0006] Further, the first optical element and the second optical element both include a light-transmitting unit array, the light-transmitting unit array of the first optical element includes a plurality of first light-transmitting units and a plurality of second light-transmitting units alternately arranged along a row direction and a column direction, the second optical element includes a plurality of third light-transmitting units and a plurality of fourth light-transmitting units alternately arranged along a row direction and a column direction, the first light-transmitting units and the third light-transmitting units are used to converge light, and the second light-transmitting units and the fourth light-transmitting units are used to diverge light;

[0007] When the first light-transmitting unit and the fourth light-transmitting unit overlap, and the second light-transmitting unit and the third light-transmitting unit overlap, the light incident on the overlapping area of ​​the first light-transmitting unit and the fourth light-transmitting unit and the overlapping area of ​​the second light-transmitting unit and the third light-transmitting unit is emitted to the photovoltaic panel according to the incident direction; when the first light-transmitting unit and the third light-transmitting unit overlap, the light incident on the overlapping area of ​​the first light-transmitting unit and the third light-transmitting unit is converged and emitted to the photovoltaic panel;

[0008] The displacement mechanism is controlled to drive at least one of the first optical element and the second optical element to move, so as to adjust the overlap degree of the first light-transmitting unit and the third light-transmitting unit, thereby adjusting the intensity of light concentrated and emitted to the photovoltaic panel, wherein when the first light-transmitting unit and the third light-transmitting unit overlap to the same optical axis, the intensity of the concentrated and emitted light is the strongest.

[0009] Furthermore, both the first optical element and the second optical element are diffractive optical elements.

[0010] Furthermore, the diffractive optical element is made of one of liquid crystal material, glass and plastic.

[0011] Furthermore, the first optical element and the second optical element are both microlens optical elements, the light-transmitting unit array is a microlens array, the first light-transmitting unit and the third light-transmitting unit are both biconvex lenses, and the second light-transmitting unit and the fourth light-transmitting unit are both biconcave lenses.

[0012] Furthermore, in the initial state of the focusing assembly, the first optical element and the second optical element completely overlap, at which time the first light-transmitting unit and the fourth light-transmitting unit have the same optical axis, and the second light-transmitting unit and the third light-transmitting unit have the same optical axis, and after the light is incident on the first optical element and the second optical element, it is emitted to the photovoltaic panel in the incident direction;

[0013] When the current output power of the photovoltaic panel is lower than the preset output power, the main control module controls the displacement mechanism to drive at least one of the first optical element and the second optical element to displace, so that the first light-transmitting unit and the third light-transmitting unit overlap, until the current output power of the photovoltaic panel is consistent with the preset output power or the first light-transmitting unit and the third light-transmitting unit overlap to the same optical axis, and then controls the displacement mechanism to stop displacement.

[0014] Furthermore, when the first light-transmitting unit and the third light-transmitting unit overlap to the same optical axis, if the current output power of the photovoltaic panel is zero, the main control module controls the displacement mechanism to drive at least one of the first optical element and the second optical element to displace, so that the focusing assembly returns to an initial state.

[0015] Furthermore, the displacement mechanism includes two two-dimensional displacers, and the two two-dimensional displacers are respectively connected to the first optical element and the second optical element.

[0016] An embodiment of the present invention further provides a solar charging device, including a photovoltaic panel and a light intensity adjustment device, wherein the light intensity adjustment device is the light intensity adjustment device described above.

[0017] Furthermore, it also includes a power supply module, which includes a charging circuit, a battery and a direct power supply circuit. The photovoltaic panel charges the battery through the charging circuit, and the battery is used to output electrical energy to the electronic device, or the photovoltaic panel outputs electrical energy to the electronic device through the direct power supply circuit.

[0018] Beneficial effects: The light intensity adjustment device for a photovoltaic panel of the present invention comprises a focusing assembly, a main control module and a displacement mechanism; the focusing assembly comprises a stacked first optical element and a second optical element, the first optical element and the second optical element are stacked on one side of the light incident surface of the photovoltaic panel, there is a gap between the first optical element and the second optical element, the displacement mechanism is connected to the first optical element and the second optical element respectively, the main control module is used to obtain the current output power of the photovoltaic panel in real time, and when the current output power is lower than the preset output power, the displacement mechanism is controlled to drive at least one of the first optical element and the second optical element to move, so as to adjust the relative position of the first optical element and the second optical element, so that at least part of the light incident on the overlapping area of ​​the first optical element and the second optical element is converged and emitted to the photovoltaic panel, thereby, by converging the light and then emitting it into the photovoltaic panel, the intensity of the light incident on the photovoltaic panel can be increased, and then the output power of the photovoltaic panel can be increased, thereby helping the photovoltaic panel to generate electrical energy even when the ambient light is dim, and extending the service life of the solar charging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The technical solutions and beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0020] Figure 1 is a schematic diagram of the structure of a solar charging device provided by an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of a light-transmitting unit array of a first optical element and a second optical element provided in an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of a light path of a light beam incident on a first optical element and a second optical element in different overlapping states provided by an embodiment of the present invention;

[0023] Figure 4 is a design flow chart of a diffractive optical element provided by an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the optical path of light incident on a microlens array A and a microlens array B in different overlapping states provided by an embodiment of the present invention;

[0025] Figure 6 It is a working flow chart of the light intensity adjustment device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] Please refer to the drawings, in which the same component symbols represent the same components, and the principle of the present invention is illustrated by implementing it in an appropriate computing environment. The following description is based on the illustrated specific embodiment of the present invention, which should not be considered as limiting other specific embodiments of the present invention that are not described in detail herein.

[0027] The light intensity adjustment device of the embodiment of the present invention can be used to increase the intensity of light incident on a photovoltaic panel, thereby helping the photovoltaic panel to generate electrical energy even in low light conditions.

[0028] See also Figure 1 An embodiment of the present invention provides a solar charging device 200, including a photovoltaic panel 40 and a light intensity adjustment device, wherein the light intensity adjustment device can adjust the intensity of light incident on the photovoltaic panel 40.

[0029] Specifically, the light intensity adjustment device according to the embodiment of the present invention includes a focusing assembly 10 , a main control module 20 and a displacement mechanism 30 .

[0030] The focusing assembly 10 includes a first optical element 101 and a second optical element 102, which are stacked on one side of the light incident surface (i.e., the photosensitive surface) of the photovoltaic panel 40, wherein the first optical element 101 may be located at the lower layer and the second optical element 102 may be located at the upper layer, or the first optical element 101 may be located at the upper layer and the second optical element 102 may be located at the lower layer. The light passes through the first optical element 101 and the second optical element 102 and then enters the photovoltaic panel 40. The first optical element 101 and the second optical element 102 may completely cover the photosensitive surface of the photovoltaic panel 40, or may partially cover it, and may be arranged according to actual needs. There is an air interlayer between the first optical element 101 and the second optical element 102, that is, there is a gap between the first optical element 101 and the second optical element 102, and the displacement mechanism 30 is connected to the first optical element 101 and the second optical element 102 respectively, and the displacement mechanism 30 is used to drive the first optical element 101 and the second optical element 102 to move respectively, such as but not limited to horizontal, vertical, rotation, pitch, tilt and other displacement modes that can be used for beam shaping. The main control module 20 is used to obtain the current output power of the photovoltaic panel 40 in real time, and when the current output power is lower than the preset output power, the displacement mechanism 30 is controlled to drive at least one of the first optical element 101 and the second optical element 102 to move, so as to adjust the relative position of the first optical element 101 and the second optical element 102, so that at least part of the light incident on the overlapping area of ​​the first optical element 101 and the second optical element 102 is converged and emitted to the photovoltaic panel 40.

[0031] Among them, the preset output power can be set according to the product parameters of the photovoltaic panel 40. The product parameters of the photovoltaic panel 40 include the relationship between light and maximum output power. When the actual output power of the photovoltaic panel 40 reaches the maximum output power, it means that the working efficiency of the photovoltaic panel 40 is in the best photoelectric conversion efficiency state. In the embodiment of the present invention, the preset output power can be set to the maximum output power of the photovoltaic panel 40. Of course, in other embodiments, the preset output power can also be set to be lower than the maximum output power. It can be set according to actual needs. When the current output power (that is, the actual output power) of the photovoltaic panel 40 is low, it means that the current ambient light may be dark and the light intensity is insufficient. At this time, through the action of the first optical element 101 and the second optical element 102, part of the light can be converged and then input into the photovoltaic panel 40, so that the light intensity incident on the photovoltaic panel 40 can be increased, and then the output power of the photovoltaic panel 40 can be increased, thereby helping the photovoltaic panel 40 to generate electricity even when the ambient light is dark, and prolonging the use time of the solar charging device.

[0032] The main control module 20 may include an ADC conversion circuit, through which the voltage and current values ​​generated by the photovoltaic panel 40 are collected, and then the main control module 20 calculates the current output power of the photovoltaic panel 40 based on the collected voltage and current values.

[0033] Further, see Figure 2 and Figure 3 In the present invention, the first optical element 101 and the second optical element 102 both include a light-transmitting unit array. The light-transmitting unit array of the first optical element 101 includes a plurality of first light-transmitting units A11 and a plurality of second light-transmitting units B12 arranged alternately along the row direction and the column direction, that is, the first light-transmitting units A11 and the second light-transmitting units B12 are arranged alternately along the row direction and also along the column direction; the second optical element 102 includes a plurality of third light-transmitting units A13 and a plurality of fourth light-transmitting units B14 arranged alternately along the row direction and the column direction, that is, the third light-transmitting units A13 and the fourth light-transmitting units B14 are arranged alternately along the row direction and also along the column direction. The first light-transmitting units A11 and the third light-transmitting units A13 are used to converge light, and the second light-transmitting units B12 and the fourth light-transmitting units B14 are used to diverge light.

[0034] Among them, Figure 3 As shown in FIG. 1, when the first light-transmitting unit A11 and the fourth light-transmitting unit B14 overlap and the second light-transmitting unit B12 and the third light-transmitting unit A13 overlap, the light incident on the overlapping area of ​​the first light-transmitting unit A11 and the fourth light-transmitting unit B14 and the overlapping area of ​​the second light-transmitting unit B12 and the third light-transmitting unit A13 is emitted to the photovoltaic panel 40 according to the incident direction, that is, the light is emitted from the overlapping area of ​​the first light-transmitting unit A11 and the fourth light-transmitting unit B14 and the overlapping area of ​​the second light-transmitting unit B12 and the third light-transmitting unit according to the incident state. Figure 3 As shown in Figure (ii), when the first light-transmitting unit A11 and the third light-transmitting unit A13 overlap, the light incident on the overlapping area of ​​the first light-transmitting unit A11 and the third light-transmitting unit A13 converges and emits to the photovoltaic panel 40, that is, the overlapping area of ​​the first light-transmitting unit A11 and the third light-transmitting unit A13 has a focusing effect, and the light converges after passing through the overlapping area of ​​the first light-transmitting unit A11 and the third light-transmitting unit A13, and the intensity of the converged light is stronger, thereby increasing the intensity of the light incident on the photovoltaic panel 40.

[0035] By controlling the displacement mechanism 30 to drive at least one of the first optical element 101 and the second optical element 102 to move, the overlap degree of the first light-transmitting unit A11 and the third light-transmitting unit A13 can be adjusted, thereby adjusting the intensity of light converged and emitted to the photovoltaic panel 40, wherein when the first light-transmitting unit A11 and the third light-transmitting unit A13 overlap to the same optical axis, the intensity of the converged light is the strongest.

[0036] In the process of the first light-transmitting unit A11 and the third light-transmitting unit A13 gradually overlapping from zero overlap to the same optical axis, the focusing ability gradually reaches the maximum value from the minimum value, and a strong focusing effect can be achieved. Taking the first optical element 101 in the upper layer as an example: the focusing ratio η=πR 2 / πr 2 , where R is the diameter of the incident beam of the first light-transmitting unit A11, and r is the diameter of the spot after focusing, that is, the focusing ratio is the area of ​​the incident beam divided by the area of ​​the spot after focusing. Under uniform lighting conditions, if the diameter of the incident beam is 2 mm and the diameter of the spot after focusing is 40 μm, the energy ratio is increased by 2500 times. Therefore, by focusing light using the focusing assembly 10, the intensity of light incident on the photovoltaic panel 40 can be increased, so that the photovoltaic panel 40 can still generate electrical energy even in dim ambient light.

[0037] In some embodiments, the first optical element 101 and the second optical element 102 may both be diffractive optical elements (DOE). The diffractive optical element may be a liquid crystal binary diffractive optical element, that is, formed by liquid crystal material. The diffractive optical element of liquid crystal material has excellent optical performance in terms of light transmission and light focusing, and can improve the light transmission and light focusing effect. Of course, the liquid crystal material can also be replaced by materials such as glass or plastic.

[0038] In order to enable the diffractive optical element to realize the light transmission and focusing effect of each light transmission unit on the light, the unit structure of the diffractive optical element can be designed by using the light distribution of the microlens. The design method of the diffractive optical element of the present invention can be carried out in the following manner:

[0039] See also Figure 4First, using optical design software, a positive and negative lens combination is designed according to the parallel incident light diameter H1 and the image plane diameter H2 being equal, and a positive lens a and a negative lens b are obtained, wherein the parallel incident light diameter H1 is the diameter of the first lens (i.e., the lens into which the light first enters), and the image plane diameter H2 is the distance between the incident surface of the photovoltaic panel 40 and the optical element closest to the photovoltaic panel 40; then, the distance between the incident surface of the photovoltaic panel 40 and the optical element closest to the photovoltaic panel 40 is taken as the image plane distance, and the positive lens a is a known element. According to the requirements of light beam focusing, a focusing lens group is designed to obtain a positive lens c; then, a negative and positive lens combination is designed according to the parallel incident light diameter H1 and the image plane diameter H2 being equal, and the positive lens c is known, and the negative lens d is obtained. The positive lens a and the negative lens d are alternately arranged in the row direction and the column direction to form a microlens array A, and the positive lens c and the negative lens b are alternately arranged in the row direction and the column direction to form a microlens array B, and the microlens array A and the microlens array B have the same size. The lens at the upper left corner (i.e., the position point of the first row and the first column) is the first lens, the first lens of the microlens array A is the negative lens d, and the first lens of the microlens array B is the positive lens c. Alternatively, the first lens of the microlens array A is the positive lens a, and the first lens of the microlens array B is the negative lens b, that is, when the microlens array A and the microlens array B completely overlap, the lenses at the same position point have opposite positive and negative properties.

[0040] like Figure 5 As shown, according to the microlens array A and microlens array B obtained by the above optical design, when the two microlens arrays are placed overlappingly, for example, microlens array A is located in the upper layer, and light enters from microlens array A, and microlens array B is located in the lower layer, and light exits from microlens array B, when positive lens a and positive lens c overlap, the incident parallel light can be converged by the overlapping positive lens a and positive lens c; when positive lens a overlaps with negative lens b, or negative lens d overlaps with positive lens c, the parallel light directly passes through the overlapping positive lens a and negative lens b, and the overlapping negative lens d and positive lens c as it is. Therefore, the designed microlens array A and microlens array B can realize the optical functions of the first optical element 101 and the second optical element 102.

[0041] Continue reading Figure 4After designing the microlens array A and the microlens array B, the parallel light is incident on the microlens array A and B respectively using simulation software, and the parallel light fills the microlens array, thereby obtaining the image plane images of the microlens array A and B respectively, and extracting the phase; using the PB (Pancharatnam-Berry) geometric phase design method, that is, the generalized Snell's Law, the optical design drawings of the diffractive optical element can be obtained respectively. After that, the light-transmitting unit array of the diffractive optical element can be prepared according to the optical design drawing. For example, when using liquid crystal materials for manufacturing, polarization optical processing equipment can be used to use polarized light to control the steering of liquid crystal molecules. The liquid crystal molecules of different light-transmitting units of different diffractive optical elements are turned differently, so that light-transmitting units with different optical functions can be obtained, thereby preparing the light-transmitting unit arrays of two diffractive optical elements.

[0042] Therefore, in the embodiment of the present invention, the diffractive optical element can be equivalent to a microlens array, and the light-transmitting unit array of the upper diffractive optical element (i.e., the first optical element 101) can be equivalent to the microlens array A, wherein the first light-transmitting unit A11 is equivalent to the positive lens a, and the second light-transmitting unit B12 is equivalent to the negative lens d; the light-transmitting unit elements of the lower diffractive optical element (i.e., the second optical element 102) are equivalent to the microlens array B, the third light-transmitting unit A13 is equivalent to the positive lens c, and the fourth light-transmitting unit B14 is equivalent to the negative lens b. It should be noted that the above-mentioned "equivalent" refers to the equivalence of optical functions, such as the optical function of the first light-transmitting unit A11 is equivalent to the optical function of the positive lens a. More specifically, when the diffractive optical element is implemented using liquid crystal materials, the effect of the liquid crystal molecules of the first light-transmitting unit A11 on light can be equivalent to the effect of the positive lens a on light, and the effect of the liquid crystal molecules of the second light-transmitting unit B12 on light can be equivalent to the effect of the negative lens d on light, and so on.

[0043] Since the optical functions of the light-transmitting unit arrays of the first optical element 101 and the second optical element 102 are respectively equivalent to the optical functions of the microlens array A and the microlens array B, in order to facilitate the description of the present invention, in the following description, the light-transmitting unit arrays of the first optical element 101 and the second optical element 102 are respectively described using the equivalent microlens array A and the microlens array B. Correspondingly, the first light-transmitting unit A11 is described using the equivalent positive lens a, the second light-transmitting unit B12 is described using the equivalent negative lens d, the third light-transmitting unit A13 is described using the equivalent positive lens c, and the fourth light-transmitting unit B14 is described using the equivalent negative lens b.

[0044] See also Figure 6 , Figure 6The flowchart of the light intensity adjustment device of the present invention is shown in FIG. 1 . In the embodiment of the present invention, the first optical element 101 and the second optical element 102 have the same size. When the solar charging device 200 is started, the photovoltaic panel 40 starts to work and converts light energy into electrical energy. The focusing assembly 10 is in the initial state. At this time, the first optical element 101 and the second optical element 102 completely overlap, and the positive lens a and the negative lens b at the corresponding position have the same optical axis, and the negative lens d and the positive lens c at the corresponding position have the same optical axis, that is, the upper lens and the lower lens are combined into a positive-negative lens combination and a negative-positive lens combination. After the parallel light is incident on the first optical element 101 and the second optical element 102, it is emitted to the photovoltaic panel 40 in the incident direction, that is, in the initial state, the focusing assembly 10 does not focus light. At this time, the focusing assembly 10 can be regarded as an afocal system of basic optics, or with the light incident surface of the photovoltaic panel 40 as the image surface, the focusing assembly 10 can be regarded as a simple structure that only considers that the incident light beam area is the same as the image surface illumination area.

[0045] The main control module 20 obtains the current output power of the photovoltaic panel 40 in real time, and compares the current output power with the preset output power. When the current output power is not lower than the preset output power, it means that the current light is sufficient and the working efficiency of the photovoltaic panel 40 is good. At this time, no dimming operation is performed; when the current output power is lower than the preset output power, it means that the current light may be weak. At this time, the main control module 20 controls the displacement mechanism 30 to drive at least one of the first optical element 101 and the second optical element 102 to move, for example, Figure 1 Taking the view as an example, the first optical element 101 can be driven to move in the row direction or in the column direction. As the first optical element 101 moves, the positive lens a and the positive lens c gradually overlap, so that the light can be converged and emitted into the photovoltaic panel 40 through the overlapping area, thereby improving the light intensity, enhancing the photoelectric conversion efficiency, and improving the output power of the photovoltaic panel 40, until the current output power of the photovoltaic panel 40 is consistent with the preset output power or the positive lens a and the positive lens c overlap to the same optical axis, then the displacement mechanism 30 is controlled to stop the displacement.

[0046] Among them, when the row direction moves, the maximum displacement of the first optical element 101 can be the width of a column, and when the column moves, the maximum displacement of the first optical element 101 can be the width of a row. It can be understood that when the first optical element 101 and the second optical element 102 are moved at the same time, the maximum value of the sum of the displacements of the first optical element 101 and the second optical element 102 is the width of a column or the width of a row. When the displacement reaches the maximum value, the positive lens a and the positive lens c overlap to the same optical axis, and the negative lens d and the negative lens b also overlap to the same optical axis. At this time, the overlapping positive lens a and the positive lens c have the strongest focusing effect. Therefore, from the initial state to the width of a row or column, the focusing ability of the positive lens a and the positive lens c gradually reaches the maximum value from zero. By making the maximum displacement the width of a row or column, the focusing ability can be maximized and the illumination area of ​​the photovoltaic panel 40 can be ensured.

[0047] During the movement, the main control module 20 compares the current output power of the photovoltaic panel 40 in real time, and controls the displacement according to the comparison result between the current output power and the preset output power. If the current output power is lower than the preset output power, the movement continues until the current output power is not lower than the preset output power, or the displacement reaches the maximum value, then the movement stops.

[0048] Furthermore, when the positive lens a and the positive lens c overlap to the same optical axis, that is, the first optical element 101 has moved the maximum displacement, if the current output power of the photovoltaic panel 40 is zero, it means that the photovoltaic panel 40 is still unable to provide electrical energy, then the main control module 20 controls the displacement mechanism 20 to drive at least one of the first optical element 101 and the second optical element 102 to displace, so as to reset the first optical element 101 and the second optical element 102, so that the focusing assembly 10 returns to its initial state, at which time the focusing assembly 10 stops focusing.

[0049] The displacement mechanism 30 may include two displacers, which may be, for example, two-dimensional displacers 301 and 302. The two two-dimensional displacers 301 and 302 are respectively connected to the first optical element 101 and the second optical element 102 to respectively drive the first optical element 101 and the second optical element 102 to move. Of course, in other embodiments, the two displacers may also be implemented by devices with displacement capability, such as piezoelectric ceramics and liquid displacers.

[0050] In other embodiments of the present invention, the first optical element 101 and the second optical element 102 may also be implemented by other optical devices. For example, the first optical element 101 and the second optical element 102 may both be microlens optical elements, and the light-transmitting unit array is a microlens array, that is, the first optical element 101 and the second optical element 102 are both made of microlenses. Among them, the first light-transmitting unit A11 and the third light-transmitting unit A13 are both double-sided convex lenses, and the second light-transmitting unit B12 and the fourth light-transmitting unit B14 are both double-sided concave lenses. Furthermore, the microlens array of the first optical element 101 may be formed by Figure 5 The microlens array A shown in the figure is implemented, and the microlens array of the second optical element 102 can be adopted Figure 5 The microlens array B shown is implemented.

[0051] Continue reading Figure 1 The solar charging device 200 of the embodiment of the present invention further includes a power module, which includes a battery 50, a charging circuit and a direct power supply circuit. The photovoltaic panel 40 charges the battery 50 through the charging circuit, and the battery is used to output power to the electronic device, or the photovoltaic panel 40 outputs power to the electronic device through the direct power supply circuit. The electronic device can be, for example, a mobile phone, a watch, an electric car, a display board, etc.

[0052] An embodiment of the present invention further provides a light intensity adjustment device, which is the light intensity adjustment device described in the above embodiment.

[0053] The light intensity adjustment device for a photovoltaic panel of the present invention comprises a focusing assembly, a main control module and a displacement mechanism; the focusing assembly comprises a stacked first optical element and a second optical element, the first optical element and the second optical element are stacked and arranged on one side of the light incident surface of the photovoltaic panel, there is a gap between the first optical element and the second optical element, the displacement mechanism is connected to the first optical element and the second optical element respectively, the main control module is used to obtain the current output power of the photovoltaic panel in real time, and when the current output power is lower than the preset output power, the displacement mechanism is controlled to drive at least one of the first optical element and the second optical element to move, so as to adjust the relative position of the first optical element and the second optical element, so that at least part of the light incident on the overlapping area of ​​the first optical element and the second optical element is converged and emitted to the photovoltaic panel, thereby, by converging the light and then emitting it into the photovoltaic panel, the intensity of the light incident on the photovoltaic panel can be increased, and then the output power of the photovoltaic panel can be increased, thereby helping the photovoltaic panel to generate electrical energy even when the ambient light is dim, and extending the service life of the solar charging device.

[0054] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A light intensity adjustment device for a photovoltaic panel, characterized in that: It includes a focusing component, a main control module and a displacement mechanism; The focusing assembly includes a first optical element and a second optical element, which are stacked on one side of the light incident surface of the photovoltaic panel, and an air barrier is provided between the first optical element and the second optical element. The displacement mechanism is respectively connected to the first optical element and the second optical element. The main control module is used to obtain the current output power of the photovoltaic panel in real time, and when the current output power is lower than the preset output power, the main control module drives at least one of the first optical element and the second optical element to move by controlling the displacement mechanism to adjust the relative positions of the first optical element and the second optical element, so that at least part of the light incident on the overlapping area of ​​the first optical element and the second optical element is converged and emitted to the photovoltaic panel.

2. The light intensity adjustment device according to claim 1, characterized in that: The first optical element and the second optical element both include a light-transmitting unit array, the light-transmitting unit array of the first optical element includes a plurality of first light-transmitting units and a plurality of second light-transmitting units alternately arranged along a row direction and a column direction, the second optical element includes a plurality of third light-transmitting units and a plurality of fourth light-transmitting units alternately arranged along a row direction and a column direction, the first light-transmitting units and the third light-transmitting units are used to converge light, and the second light-transmitting units and the fourth light-transmitting units are used to diverge light; When the first light-transmitting unit and the fourth light-transmitting unit overlap, and the second light-transmitting unit and the third light-transmitting unit overlap, the light incident on the overlapping area of ​​the first light-transmitting unit and the fourth light-transmitting unit and the overlapping area of ​​the second light-transmitting unit and the third light-transmitting unit is emitted to the photovoltaic panel according to the incident direction; when the first light-transmitting unit and the third light-transmitting unit overlap, the light incident on the overlapping area of ​​the first light-transmitting unit and the third light-transmitting unit is converged and emitted to the photovoltaic panel; The displacement mechanism is controlled to drive at least one of the first optical element and the second optical element to move, so as to adjust the overlap degree of the first light-transmitting unit and the third light-transmitting unit, thereby adjusting the intensity of light concentrated and emitted to the photovoltaic panel, wherein when the first light-transmitting unit and the third light-transmitting unit overlap to the same optical axis, the intensity of the concentrated and emitted light is the strongest.

3. The light intensity adjustment device according to claim 2, characterized in that: The first optical element and the second optical element are both diffractive optical elements.

4. The light intensity adjustment device according to claim 3, characterized in that: The diffractive optical element is made of one of liquid crystal material, glass and plastic.

5. The light intensity adjustment device according to claim 2, characterized in that: The first optical element and the second optical element are both microlens optical elements, the light-transmitting unit array is a microlens array, the first light-transmitting unit and the third light-transmitting unit are both biconvex lenses, and the second light-transmitting unit and the fourth light-transmitting unit are both biconcave lenses.

6. The light intensity adjustment device according to claim 2, characterized in that: In the initial state of the focusing assembly, the first optical element and the second optical element completely overlap, at which time the first light-transmitting unit and the fourth light-transmitting unit have the same optical axis, and the second light-transmitting unit and the third light-transmitting unit have the same optical axis, and after the light is incident on the first optical element and the second optical element, it is emitted to the photovoltaic panel in the incident direction; When the current output power of the photovoltaic panel is lower than the preset output power, the main control module controls the displacement mechanism to drive at least one of the first optical element and the second optical element to displace, so that the first light-transmitting unit and the third light-transmitting unit overlap, until the current output power of the photovoltaic panel is consistent with the preset output power or the first light-transmitting unit and the third light-transmitting unit overlap to the same optical axis, and then controls the displacement mechanism to stop displacement.

7. The light intensity adjustment device according to claim 6, characterized in that: When the first light-transmitting unit and the third light-transmitting unit overlap to the same optical axis, if the current output power of the photovoltaic panel is zero, the main control module controls the displacement mechanism to drive at least one of the first optical element and the second optical element to displace, so that the focusing assembly returns to an initial state.

8. The light intensity adjustment mechanism according to claim 1, characterized in that: The displacement mechanism comprises two two-dimensional displacers, and the two two-dimensional displacers are respectively connected to the first optical element and the second optical element.

9. A solar charging device, characterized in that: It comprises a photovoltaic panel and a light intensity regulating device, wherein the light intensity regulating device is the light intensity regulating device according to any one of claims 1 to 8.

10. The solar charging device according to claim 9, characterized in that: It also includes a power supply module, which includes a charging circuit, a battery and a direct power supply circuit. The photovoltaic panel charges the battery through the charging circuit, and the battery is used to output electrical energy to the electronic device, or the photovoltaic panel outputs electrical energy to the electronic device through the direct power supply circuit.

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