A light charging system

Abstract

The present invention provides a light charging system. It includes a visible light point light source, a hollow sphere, a first lens, a second lens, a third lens and a photodetector; the visible light point light source is arranged at the center of the hollow sphere; the inner wall of the hollow sphere is coated with a total reflection material; a light outlet is arranged on the hollow sphere; the first lens is arranged on the inner side of the light outlet, and the second lens is arranged on the outer side of the light outlet; the optical axis of the first lens coincides with the optical axis of the second lens; the optical axis passes through the center of the hollow sphere; the outgoing light of the second lens is irradiated on the third lens; the photodetector is arranged at the focal position of the third lens. The present invention can improve the utilization rate of charging light, reduce the charging light power, and improve safety by adopting the inner wall total reflection hollow sphere light source structure and the focusing lens; the diameter of the charging light beam after convergence is reduced, the irradiation range of the light beam is reduced, and the safety risk is reduced; at the same time, the safety risk caused by the use of a laser light source is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging, and in particular to an optical charging system. Background Art

[0002] At present, the traditional charging method is wired charging, for example, using a charger and a charging cable to convert 220V mains electricity to the corresponding charging level. In the wired charging method, new materials (such as lithium sulfur, graphene, etc.) and charging control technologies such as trickle charging can be used to realize the charging of large-capacity batteries.

[0003] However, the wired charging method is inconvenient to use because it requires a charging cable and the charging position is fixed. The wireless charging method has the advantages of low equipment wear rate, wide application range, convenient operation, high technical content and relatively small public charging area, and is gradually becoming the preferred solution for charging small-capacity batteries. At present, the main wireless charging solutions are electromagnetic induction charging, magnetic field resonance charging and radio wave charging. Electromagnetic induction charging and magnetic field resonance charging need to be close to the charging device during charging, which is not convenient for mobile charging and is not true wireless charging. Radio wave charging is mainly composed of microwave transmitting devices and microwave receiving devices, which can capture radio wave energy rebounded from the wall and maintain a stable DC voltage while adjusting with the load. However, the loss of this radio wave energy obtained by reflection will also be relatively large. The common problem of these solutions is that the electromagnetic radiation is large, which will cause electromagnetic radiation damage to the human body.

[0004] Existing technology also proposes that lasers can be used for wireless charging, but the laser energy density is high and there is a risk of damage to the human eyes, skin and even internal organs. There is an irreconcilable contradiction between charging power and safety. Summary of the invention

[0005] The embodiment of the present invention provides a light charging system to solve the problem of low safety of the existing wireless charging method.

[0006] In a first aspect, an embodiment of the present invention provides an optical charging system, including a transmitting end and a receiving end, wherein the transmitting end includes a charging optical transmitting module, and the receiving end includes a charging optical receiving module;

[0007] The charging light emission module includes a visible light point light source, a hollow sphere, a first lens and a second lens;

[0008] The visible light point light source is arranged at the center of the hollow sphere; the inner wall of the hollow sphere is coated with a total reflection material; a light outlet is arranged on the hollow sphere; the first lens is arranged on the inner side of the light outlet, and the second lens is arranged on the outer side of the light outlet;

[0009] The first lens and the second lens are condenser lenses; the optical axis of the first lens coincides with the optical axis of the second lens; the optical axis passes through the center of the hollow sphere;

[0010] The charging light receiving module includes a third lens and a photodetector; the outgoing light of the second lens is irradiated on the third lens; the third lens is a focusing lens; the photodetector is arranged at the focal position of the third lens; the light incident surface of the photodetector coincides with the focal plane of the third lens.

[0011] In a possible implementation, the visible light point light source includes a light emitting diode white light source; and a light emitting direction of the light emitting diode white light source is the same as a direction of an optical axis of the first lens.

[0012] In a possible implementation, the transmitting end further includes a first rotating module; the first rotating module is used to rotate the charging light transmitting module so that the output light of the second lens is irradiated on the third lens.

[0013] In a possible implementation, the receiving end also includes a second rotation module; the second rotation module is used to control the rotation of the charging light receiving module so that the optical axis direction of the second lens coincides with the optical axis direction of the third lens.

[0014] In a possible implementation, the inner wall roughness of the hollow sphere is less than 0.3 nanometers.

[0015] In a possible implementation, the material of the hollow sphere includes magnesium fluoride, calcium fluoride or lithium niobate.

[0016] In a possible implementation manner, the total reflection material includes aluminum, silver, gold or copper.

[0017] In a possible implementation, the receiving end further includes a signal light transmitting module, and the transmitting end further includes a signal light receiving module;

[0018] The signal light transmitting module is used to transmit signal light;

[0019] The signal light receiving module is used to receive the signal light;

[0020] The charging light emitting module turns on the visible light point light source according to the signal light.

[0021] In a possible implementation manner, the optical power per unit area of ​​the signal light after attenuation through air propagation is greater than the sensitivity per unit area of ​​the signal light receiving module.

[0022] In a possible implementation, when the signal light receiving module does not receive the signal light, the charging light transmitting module turns off the visible light point light source;

[0023] Correspondingly, the first rotating module is used to control the signal light receiving module to rotate until the signal light receiving module receives the signal light.

[0024] An embodiment of the present invention provides an optical charging system, comprising a transmitting end and a receiving end, wherein the transmitting end comprises a charging optical transmitting module, and the receiving end comprises a charging optical receiving module; the charging optical transmitting module comprises a visible light point light source, a hollow sphere, a first lens and a second lens; the visible light point light source is arranged at the center of the hollow sphere; the inner wall of the hollow sphere is coated with a total reflection material; a light outlet is provided on the hollow sphere; the first lens is arranged on the inner side of the light outlet, and the second lens is arranged on the outer side of the light outlet; the first lens and the second lens are focusing lenses; the optical axis of the first lens coincides with the optical axis of the second lens; the optical axis passes through the center of the hollow sphere; the charging optical receiving module comprises a third lens and a photodetector; the outgoing light of the second lens is irradiated on the third lens; the third lens is a focusing lens; the photodetector is arranged at the focal position of the third lens; the light incident surface of the photodetector coincides with the focal plane of the third lens. The charging light is emitted by a visible light point light source, and the inner wall of the hollow sphere reflects the charging light; the charging light is converged by the first lens and the second lens and then emitted to the third lens of the receiving module; the charging light is converged by the third lens and converted into an electrical signal by the photodetector; the electrical signal is used to charge the battery. The use of the hollow sphere light source structure with full reflection on the inner wall and the focusing lens improves the utilization rate of the charging light, reduces the charging light power, and improves safety; the diameter of the charging light beam after convergence is reduced, the irradiation range of the beam is reduced, and the safety risk is reduced; at the same time, the safety risk caused by the use of laser light sources is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 is a schematic diagram of the structure of a light charging system provided by an embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram of an application scenario of the optical charging system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0029] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0030] The following is a detailed description of the implementation of the present invention in conjunction with the specific drawings:

[0031] Figure 1 A schematic diagram of the structure of a light charging system provided by an embodiment of the present invention. Figure 1 The optical charging system includes: a transmitting end and a receiving end, the transmitting end includes a charging optical transmitting module 1, and the receiving end includes a charging optical receiving module 2; the charging optical transmitting module 1 includes a visible light point light source 11, a hollow sphere 12, a first lens 13 and a second lens 14.

[0032] The visible light point light source 11 is arranged at the center of the hollow sphere 12 .

[0033] In an optional embodiment, a bracket can be used to fix the visible light point light source 11 at the center of the hollow sphere 12; one end of the bracket is connected to the visible light point light source 11; the other end of the bracket is connected to the inner wall of the hollow sphere 12; a power cord is arranged inside the bracket to supply power to the visible light point light source 11; and the surface of the bracket is coated with a total reflection material.

[0034] The inner wall of the hollow sphere 12 is coated with a total reflection material; a light outlet 15 is provided on the hollow sphere 12 ; the first lens 13 is arranged on the inner side of the light outlet 15 , and the second lens 14 is arranged on the outer side of the light outlet 15 .

[0035] In an optional embodiment, the first lens 13 is disposed on the inner wall of the hollow sphere 12 , and the second lens 14 is disposed on the outer wall of the hollow sphere 12 .

[0036] In an optional embodiment, the first lens 13 and the second lens 14 are fixed on the light outlet 15 through a hollow tube. The first lens 13 and the second lens 14 are respectively fixed at both ends of the hollow tube; the hollow tube passes through the light outlet 15 and is connected to the hollow sphere 12; the inner wall and the outer wall of the hollow tube are coated with a total reflection material; the distance between the first lens 13 and the second lens 14 is adjusted by adjusting the length of the hollow tube; the distance between the first lens 13 and the visible light point light source 11 is adjusted by setting the relative position of the hollow tube and the hollow sphere 12.

[0037] The first lens 13 and the second lens 14 are focusing lenses; the optical axis of the first lens 13 coincides with the optical axis of the second lens 14; the optical axis passes through the center of the hollow sphere 12; the charging light receiving module 2 includes a third lens 21 and a photodetector 22; the output light of the second lens 14 is irradiated on the third lens 21; the third lens 21 is a focusing lens; the photodetector 22 is arranged at the focal position of the third lens 21; the light incident surface of the photodetector 22 coincides with the focal plane of the third lens 21.

[0038] In an optional embodiment, the radius of the first lens 13 is greater than the radius of the second lens 14 .

[0039] The purpose of the first lens 13 is to converge the charging light in the hollow sphere 12, and initially converge it and irradiate it to the second lens 14; the second lens 14 has a smaller radius and further converges the charging light to form a charging light with an extremely small spot and emit it into space.

[0040] The charging light is emitted by the visible light point light source 11, and the inner wall of the hollow sphere 12 reflects the charging light; the charging light is converged by the first lens 13 and the second lens 14 and then emitted to the third lens 21 of the receiving module; the charging light is converged by the third lens 21 and converted into an electrical signal by the photodetector 22; the electrical signal is used to charge the battery. The use of the light source structure of the hollow sphere 12 with full reflection on the inner wall and the focusing lens improves the utilization rate of the charging light, reduces the charging light power, and improves safety; the diameter of the charging light beam after convergence is reduced, the irradiation range of the light beam is reduced, and the safety risk is reduced; at the same time, the safety risk caused by the use of a laser light source is avoided.

[0041] Figure 2 Schematic diagram of application scenarios of the optical charging system provided by the embodiment of the present invention. Figure 2 , the transmitter can be fixed at a higher position than the receiving end; for example, the transmitter can be fixed on a wall, ceiling or pole to charge the receiving end in a single fixed area. For example, the transmitter can be fixed on a slide rail to charge the receiving ends in multiple fixed areas.

[0042] The transmitting end may also be fixed at a position lower than the receiving end. For example, the transmitting end may charge a drone flying in the sky.

[0043] Visible light is the part of the electromagnetic spectrum that can be perceived by the human eye. When using a visible light source, in actual applications, due to the scattering effect of the air on the charging light and the Tyndall effect, the human eye can perceive the existence of the charging light, thereby avoiding the danger of looking directly at the light source and improving safety. A point light source refers to a light source that emits light uniformly from a point to the surrounding space. In theory, the light power of a point light source is evenly distributed in all directions. Under the same power, the visible light point light source 11 has a larger spot diameter and lower energy density than a laser light source, which can reduce damage to the human eye caused by the high energy density of the laser light source.

[0044] In an optional embodiment, the visible light point light source 11 includes a light emitting diode white light source.

[0045] White light is a composite light, which is a mixture of multiple colored lights; it is generally a mixture of two-wavelength light or three-wavelength light. Under the premise of the same power, the visible light band including white light is the least harmful to the human eye. Others, such as 10.6μm carbon dioxide laser, have a high skin absorption rate, which can easily cause the irradiated local temperature to rise rapidly, causing damage to the human body; the ultraviolet light band can cause skin erythema and aging.

[0046] In an optional embodiment, the light emitting direction of the LED white light source is the same as the optical axis direction of the first lens 13 .

[0047] The light emitting direction of the LED white light source is the normal direction of the light emitting surface of the LED chip. The light emitting direction of the LED white light source is the same as the optical axis direction of the first lens 13, and the optical axis of the first lens 13 passes through the center of the LED chip.

[0048] The condenser lens can focus light on a certain point to achieve the effect of converging the light. The condenser lens is a method to reduce the light divergence angle and increase the light intensity per unit area.

[0049] The principle of the photodetector 22 is that the conductivity of the irradiated material changes due to radiation, generating photocurrent. The photodetector 22 has the characteristics of high responsiveness and wide response spectrum, which can adapt to the wide spectrum of white light source.

[0050] In an optional embodiment, the lower surface of the photodetector 22 is coated with a high-reflection film with a reflectivity greater than 99.98% to reduce transmission loss and improve photoelectric conversion efficiency.

[0051] In an optional embodiment, the photodetector 22 may be in the form of a chip array, thereby improving the conversion efficiency by accumulating current through a large array.

[0052] The light incident surface of the photodetector 22 coincides with the focal plane of the third lens 21 , that is, the photodetector 22 is at the focal position of the third lens 21 , and the light incident surface of the photodetector 22 is perpendicular to the optical axis of the third lens 21 .

[0053] Exemplarily, the area of ​​the light incident surface of the photodetector 22 is larger than the area of ​​the charging light spot at the focal plane of the third lens 21 .

[0054] In an optional embodiment, the transmitting end further includes a first rotating module 3 ; the first rotating module 3 is used to rotate the charging light transmitting module 1 so that the output light of the second lens 14 is irradiated on the third lens 21 .

[0055] The emitted light of the second lens 14 is irradiated on the third lens 21, that is, the angle between the optical axis direction of the second lens 14 and the optical axis direction of the third lens 21 is less than ninety degrees. The optical axis direction of the lens is the end of the optical axis of the lens facing the light transmission direction. When the angle between the optical axis direction of the second lens 14 and the optical axis direction of the third lens 21 is greater than or equal to ninety degrees, the emitted light of the second lens 14 cannot be irradiated on the third lens 21.

[0056] In an optional embodiment, the receiving end further includes a second rotating module 4 ; the second rotating module 4 is used to control the rotation of the charging light receiving module 2 so that the optical axis direction of the second lens 14 coincides with the optical axis direction of the third lens 21 .

[0057] The optical axis direction of the second lens 14 coincides with the optical axis direction of the third lens 21 , that is, the charging light is irradiated vertically on the third lens 21 . At this time, the light power received by the third lens 21 is the largest and the charging efficiency is the highest.

[0058] In an optional embodiment, the inner wall roughness of the hollow sphere 12 is less than 0.3 nanometers.

[0059] The charging light is reflected by the inner wall of the hollow sphere 12 to generate reflected light; the quality factor Q value of the reflected light in multiple reflection transmission can reach 10 9 above.

[0060] In an optional embodiment, the material of the hollow sphere 12 includes magnesium fluoride, calcium fluoride or lithium niobate.

[0061] The coated total reflection material can be a material with high reflectivity, low roughness and low light transmittance, and has excellent ductility and flexibility, and can fit the inner wall structure of the hollow sphere 12 very well.

[0062] In an alternative embodiment, the fully reflective material includes aluminum, silver, gold or copper.

[0063] In an optional embodiment, the receiving end further includes a signal light transmitting module 5, and the transmitting end further includes a signal light receiving module 6;

[0064] The signal light transmitting module 5 is used to transmit signal light; the signal light receiving module 6 is used to receive signal light; and the charging light transmitting module 1 turns on the visible light point light source 11 according to the signal light.

[0065] In an optional embodiment, the optical power per unit area of ​​the signal light after attenuation through air propagation is greater than the sensitivity per unit area of ​​the signal light receiving module 6 .

[0066] That is, the optical power of the signal light needs to meet the following conditions:

[0067]

[0068] P0 is the optical power of the signal light, α is the spatial divergence angle of the signal light, β is the atmospheric attenuation factor, is the receiving sensitivity of the signal light receiving module 6, S is the receiving surface area of ​​the signal light receiving module 6, and L is the transmission distance of the signal light.

[0069] Exemplarily, the signal light source may adopt a continuous wave 1550nm distributed feedback laser to generate a continuous signal; the signal light receiving module 6 may adopt a device corresponding to the signal light source for capturing and real-time tracking.

[0070] In an optional embodiment, the system further includes a battery module; when the power level of the battery module is lower than a preset value, the signal light transmitting module 5 continues to emit signal light; when the power level of the battery module is higher than a preset value, the signal light transmitting module 5 stops emitting signal light.

[0071] During the charging process, the signal light transmitting module 5 continuously transmits the signal light and maintains continuous communication with the signal light receiving module 6 until the signal light is turned off after charging is completed. Maintaining continuous communication during the charging process facilitates continuous adjustment of the direction of the charging light, tracking the movement of the charged device, and achieving uninterrupted charging on the move.

[0072] After charging is completed, the signal light transmitting module 5 automatically turns off the signal light; correspondingly, when the signal light receiving module 6 cannot receive the signal light, the charging light source is automatically turned off, and the signal light receiving module 6 is controlled by the second rotating module 4 to scan the signal light to recapture the signal light.

[0073] In an optional embodiment, when the signal light receiving module 6 does not receive signal light, the charging light transmitting module 1 turns off the visible light point light source 11; the corresponding first rotating module 3 is used to control the signal light receiving module 6 to rotate until the signal light receiving module 6 receives signal light.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light charging system, comprising a transmitting end and a receiving end, characterized in that: The transmitting end includes a charging light transmitting module, and the receiving end includes a charging light receiving module; The charging light emission module includes a visible light point light source, a hollow sphere, a first lens and a second lens; The visible light point light source is arranged at the center of the hollow sphere; the inner wall of the hollow sphere is coated with a total reflection material; The hollow sphere is provided with a light outlet; the first lens is arranged on the inner side of the light outlet, and the second lens is arranged on the outer side of the light outlet; The first lens and the second lens are condenser lenses; the optical axis of the first lens coincides with the optical axis of the second lens; The optical axis passes through the center of the hollow sphere; The charging light receiving module includes a third lens and a photodetector; the outgoing light of the second lens is irradiated on the third lens; the third lens is a focusing lens; the photodetector is arranged at the focal position of the third lens; the light incident surface of the photodetector coincides with the focal plane of the third lens; The receiving end further includes a signal light transmitting module, and the transmitting end further includes a signal light receiving module; The signal light transmitting module is used to transmit signal light; The signal light receiving module is used to receive the signal light; The charging light emitting module turns on the visible light point light source according to the signal light.

2. A light charging system as claimed in claim 1, characterized in that: The visible light point light source includes a light emitting diode white light source; The light emitting direction of the LED white light source is the same as the optical axis direction of the first lens.

3. A light charging system as claimed in claim 2, characterized in that: The transmitting end also includes a first rotating module; the first rotating module is used to rotate the charging light transmitting module so that the output light of the second lens is irradiated on the third lens.

4. A light charging system as claimed in claim 3, characterized in that: The receiving end also includes a second rotating module; the second rotating module is used to control the rotation of the charging light receiving module so that the optical axis direction of the second lens coincides with the optical axis direction of the third lens.

5. A light charging system as claimed in claim 1, characterized in that: The inner wall roughness of the hollow sphere is less than 0.3 nanometers.

6. A light charging system as claimed in claim 5, characterized in that: The material of the hollow sphere includes magnesium fluoride, calcium fluoride or lithium niobate.

7. A light charging system as claimed in claim 1, characterized in that: The total reflection material includes aluminum, silver, gold or copper.

8. A light charging system as claimed in claim 1, characterized in that: The optical power per unit area of ​​the signal light after attenuation through air propagation is greater than the sensitivity per unit area of ​​the signal light receiving module.

9. A light charging system as claimed in claim 3, characterized in that: When the signal light receiving module does not receive the signal light, the charging light transmitting module turns off the visible light point light source; Correspondingly, the first rotating module is used to control the signal light receiving module to rotate until the signal light receiving module receives the signal light.

Images