Photovoltaic electronic paper table card system and working method thereof

Abstract

The application provides a photovoltaic electronic paper table card system and a working method thereof. The system comprises a photovoltaic panel, a photoelectric conversion unit, a voltage acquisition unit and a processor unit. The photovoltaic panel is used to obtain the light intensity. The photoelectric conversion unit is connected with the photovoltaic panel and the processor unit respectively. The photoelectric conversion unit is used to convert the energy of the light intensity into electric energy and use or store the electric energy. The voltage acquisition unit is connected with the photovoltaic panel and the processor unit respectively. The voltage acquisition unit is used to obtain the voltage value of the open circuit voltage of the photovoltaic panel and transmit the voltage value to the processor unit. The processor unit is provided with a threshold value. The processor unit is used to compare the voltage value with the set threshold value to determine the working state of the system. The photovoltaic panel, the photoelectric conversion unit, the voltage acquisition unit and the processor unit are all arranged in the electronic paper table card. Through different working states, the system can maintain the working state for a long time and avoid the rapid energy consumption when the light is insufficient.

Description

Technical Field

[0001] This invention relates to the field of electronic paper signboard technology, specifically to a photovoltaic electronic paper signboard system and its working method. Background Technology

[0002] Electronic paper display technology, with its static display feature that consumes no power, has an irreplaceable advantage in applications that emphasize presentation over interaction. However, screen refresh, wireless data transmission and reception, and regular standby still require energy. With the optimization and integration of current technologies, electronic paper nameplates can now be used for several months to more than a year on two AAA or AA batteries. Given the device's low power consumption and the relatively good lighting in the usage scenarios, if solar power technology could be developed, the device could be battery-free or have its battery replacement intervals significantly extended. This would reduce the maintenance costs of electronic nameplates and make them more environmentally friendly.

[0003] The difference in light intensity between indoor and outdoor lighting is significant. Although some photovoltaic panels with good low-light performance can generate electricity indoors, the amount of energy produced is still relatively small. For tabletop signage devices, which need to be in standby mode for extended periods and ready to operate at any time, a considerable amount of energy is consumed for screen refresh. Therefore, effectively controlling the power consumption of these devices is a key technology for the practical application of photovoltaic tabletop signage. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a photovoltaic electronic paper table card system.

[0005] This invention provides a photovoltaic electronic paper nameplate system, the system comprising:

[0006] Photovoltaic panel, photoelectric conversion unit, voltage acquisition unit, processor unit;

[0007] The photovoltaic panel is used to obtain light intensity;

[0008] The photoelectric conversion unit is connected to the photovoltaic panel and the processor unit, respectively.

[0009] The photoelectric conversion unit is used to convert the energy of light intensity into electrical energy, and to use or store the electrical energy.

[0010] The voltage acquisition unit is connected to the photovoltaic panel and the processor unit, respectively.

[0011] The voltage acquisition unit is used to obtain the open-circuit voltage value of the photovoltaic panel and transmit the voltage value to the processor unit.

[0012] The processor unit has a built-in threshold, which is used to compare the voltage value with the set threshold to determine the system's operating status.

[0013] The photovoltaic panel, photoelectric conversion unit, voltage acquisition unit, and processor unit are all housed within the electronic paper table sign.

[0014] Preferably, the threshold includes a first threshold and a second threshold; the first threshold is less than the second threshold; the first threshold and the second threshold are used to compare with the voltage value.

[0015] Preferably, the operating states include a non-use state, a low-power use state, and a normal use state;

[0016] The condition for determining the non-use state is that the voltage value is less than the first threshold; the system does not work when it is in the non-use state.

[0017] The condition for determining a low-power usage state is that the voltage value is greater than or equal to the first threshold and less than or equal to the second threshold; when in a low-power usage state, the system reduces power consumption.

[0018] The condition for determining normal use is that the voltage value is greater than the second threshold; the system works normally when it is in normal use.

[0019] Preferably, when the system is in a low-power operation state, the operating parameters are adjusted based on the voltage value to reduce system power consumption.

[0020] Preferably, the system further includes an energy storage unit; the energy storage unit is connected to the photoelectric conversion unit; when the system is in normal use, some of the electrical energy is in excess, and the energy storage unit stores the remaining electrical energy.

[0021] Preferably, the operating parameters include the interval between wireless transmission and reception and the operating frequency of the system clock.

[0022] Preferably, it further includes a photovoltaic wake-up unit, which is connected to the photovoltaic panel and the processor unit respectively; the photovoltaic wake-up unit is used to wake up the processor unit when it is not in use according to the light intensity.

[0023] Preferably, the connection between the photovoltaic panel and the photoelectric conversion unit is periodically disconnected to obtain the open-circuit voltage of the photovoltaic panel.

[0024] This invention also provides a method for operating a photovoltaic electronic paper nameplate system, the method comprising the following steps:

[0025] Step 1: Power on the system; obtain the light intensity based on the photovoltaic panel;

[0026] Step 2: The photoelectric conversion unit converts the energy of light intensity into electrical energy;

[0027] Step 3: The processor unit periodically acquires the open-circuit voltage value of the photovoltaic panel and records it as V. I And set a first threshold and a second threshold, with the first threshold denoted as V. L The second threshold is denoted as V. H ;

[0028] Step 4: As the light intensity increases, the voltage value is compared with the first threshold and the second threshold to obtain different working states;

[0029] When V I <V L When the system is in a non-use state, power consumption is extremely low.

[0030] When V L ≤V I ≤V H When the system is in a low-power operation state, the system dynamically adjusts its operating parameters based on the constantly changing voltage value to reduce system power consumption.

[0031] When V I >V H When the system is in normal operation, and there is excess electrical energy, the remaining electrical energy is stored by the energy storage unit.

[0032] Preferably, step 4 further includes: when the voltage value is greater than the first threshold, the photovoltaic wake-up unit obtains startup energy and generates a wake-up signal based on the startup energy; the wake-up signal is used to wake up the processor unit to restore its usage state.

[0033] The technical solution of this invention has the following advantages: This invention converts energy based on light intensity into electrical energy, and adjusts the system's different operating states based on the open-circuit voltage of the photovoltaic panel; through different operating states, the system can maintain its operating state for a long time, while avoiding excessive energy consumption when there is insufficient light; and based on the characteristics of the photovoltaic panel, the voltage changes significantly with light intensity under weak light conditions, showing a good linear correlation, which is more conducive to accurately judging the ambient light, and the accuracy requirements of the voltage acquisition unit are low. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the photovoltaic electronic paper nameplate system provided in the first embodiment of the present invention;

[0036] Figure 2 This is a flowchart illustrating the operation method of the photovoltaic electronic paper nameplate system provided in the first embodiment of the present invention. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] like Figure 1 As shown, this embodiment provides a photovoltaic electronic paper nameplate system, which includes:

[0042] Photovoltaic panel, photoelectric conversion unit, voltage acquisition unit, processor unit;

[0043] The photovoltaic panel is used to obtain light intensity;

[0044] The photoelectric conversion unit is connected to the photovoltaic panel and the processor unit, respectively.

[0045] The photoelectric conversion unit is used to convert the energy of light intensity into electrical energy, and to use or store the electrical energy.

[0046] The voltage acquisition unit is connected to the photovoltaic panel and the processor unit, respectively.

[0047] The voltage acquisition unit is used to acquire the open-circuit voltage value of the photovoltaic panel and transmit the voltage value to the processor unit;

[0048] The processor unit has a built-in threshold, which is used to compare the voltage value with the set threshold to determine the system's operating status.

[0049] The photovoltaic panel, photoelectric conversion unit, voltage acquisition unit, and processor unit are all housed within the electronic paper table sign.

[0050] Furthermore, the threshold includes a first threshold and a second threshold; the first threshold is less than the second threshold; the first threshold and the second threshold are used to compare with the voltage value.

[0051] Furthermore, the operating states include non-use state (power off or deep sleep state), low-power use state, and normal use state;

[0052] The condition for determining the non-use state is that the voltage value is less than or equal to the first threshold; the system does not work when it is in the non-use state.

[0053] The condition for determining a low-power usage state is that the voltage value is greater than the first threshold and less than the second threshold; when in a low-power usage state, the system reduces power consumption.

[0054] The condition for determining normal use is that the voltage value is greater than or equal to the second threshold; the system works normally when it is in normal use.

[0055] In this embodiment, the system further includes an energy storage unit; the energy storage unit is connected to the photoelectric conversion unit; when the system is in normal use, some of the electrical energy is in excess, and the energy storage unit stores the remaining electrical energy.

[0056] When the system is in a low-power operation state, the operating parameters are adjusted based on the voltage value to reduce system power consumption; the operating parameters include the wireless transmission and reception interval and the operating frequency of the system clock.

[0057] The system also includes a photovoltaic wake-up unit, which is connected to the photovoltaic panel and the processor unit respectively; the photovoltaic wake-up unit is used to wake up the processor unit when it is not in use according to the light intensity.

[0058] Based on the above system, this embodiment also provides a method for operating the system, which includes the following steps:

[0059] Step 1: Power on the system; obtain the light intensity based on the photovoltaic panel;

[0060] Step 2: The photoelectric conversion unit converts the energy of light intensity into electrical energy;

[0061] Step 3: The processor unit periodically acquires the open-circuit voltage value of the photovoltaic panel and records it as V. I And set a first threshold and a second threshold, with the first threshold denoted as V. L The second threshold is denoted as V. H ;

[0062] Step 4: As the light intensity increases, the voltage value is compared with the first threshold and the second threshold to obtain different working states;

[0063] When V I <V L When the system is in a non-use state, power consumption is extremely low.

[0064] When V L ≤V I ≤V H When the system is in a low-power operation state, the system dynamically adjusts its operating parameters based on the constantly changing voltage value to reduce system power consumption.

[0065] When V I >V H When the system is in normal operation, and there is excess electrical energy, the remaining electrical energy is stored by the energy storage unit.

[0066] It should be further noted that step 4 also includes: when the voltage value is greater than the first threshold, the photovoltaic wake-up unit obtains startup energy and generates a wake-up signal based on the startup energy; the wake-up signal is used to wake up the processor unit and restore its usage state. The photovoltaic wake-up unit is directly powered by the photovoltaic panel.

[0067] In this embodiment, the photoelectric conversion unit includes an MPPT controller. To prevent the MPPT controller from affecting the voltage and current output by the photovoltaic panel when the load changes, thus causing an incorrect correspondence between the collected voltage and light intensity, this embodiment periodically disconnects the output load of the photovoltaic panel and uses the collected open-circuit voltage of the photovoltaic panel to determine the accurate light intensity.

[0068] Example: The open-circuit voltage of a photovoltaic panel is denoted as V. OC Let the light intensity be denoted as p, and there is a corresponding linear exponent K between them; the corresponding relationship is denoted as: V OC =p*K. And the light intensity is related to the converted current I. PV There exists a fixed relationship between them, which is denoted as: IPV =f(V OC / K);

[0069] Let the current of other functions (Bluetooth broadcast) in system standby mode be: I IDLE =I L +I BT / T, where I L This is the system bottom current, which is a constant value; I BT The average current for Bluetooth broadcasts once per second is a constant value; T is the set broadcast cycle time.

[0070] In order to maintain the system's dynamic energy balance, then I IDLE ≤I PV , that is I L +I BT / T≤f(V OC / K); From this, it can be deduced that: T≥I BT / (f(V OC / K)-I L Thus, knowing the open-circuit voltage V of the photovoltaic panel... OC In this case, the Bluetooth broadcast period can be set to an appropriate value to maintain balance; in this embodiment, a third threshold T is set. TH If V appears OC =0 or V OC Very low, resulting in T≥T TH When this happens, the system enters shutdown mode because the environment is too dark for the table cards to be used.

[0071] The output energy of photovoltaics is limited by the intensity of sunlight and the area of ​​the photovoltaic panels. Indoors, the intensity of sunlight is directly affected by the lighting. While meeting rooms, exhibition halls, and offices have relatively good lighting conditions, they are still much worse than outdoors. The area of ​​the photovoltaic panels is also limited by the size of the panels, preventing them from covering a large area. Therefore, more precise power management is needed to dynamically adjust the operating state based on the input energy: for example, in the absence of light, the system will not be in use, and the equipment can be put into a shutdown or deep sleep state to achieve minimum power consumption; if the sunlight has a certain intensity, but the converted electrical energy is insufficient to maintain the energy consumed by the system's normal operation, the operating parameters can be adjusted to achieve energy balance as much as possible; when the sunlight intensity is sufficient, the system enters normal operating mode, and the energy at this time can be used to maintain system operation while storing excess energy in the energy storage unit. Through the combination of these three states, the system can maintain its operating state for a long time while avoiding excessive consumption of the energy storage unit when sunlight is insufficient.

[0072] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A photovoltaic electronic paper nameplate system, characterized in that, include: Photovoltaic panel, photoelectric conversion unit, voltage acquisition unit, processor unit; The photovoltaic panel is used to obtain light intensity; The photoelectric conversion unit is connected to the photovoltaic panel and the processor unit, respectively. The photoelectric conversion unit is used to convert the energy of light intensity into electrical energy, and to use or store the electrical energy. The voltage acquisition unit is connected to the photovoltaic panel and the processor unit, respectively. The voltage acquisition unit is used to acquire the open-circuit voltage value of the photovoltaic panel and transmit the voltage value to the processor unit; The connection between the photovoltaic panel and the photoelectric conversion unit is periodically disconnected to obtain the open-circuit voltage of the photovoltaic panel; The processor unit has a built-in threshold, which is used to compare the voltage value with the set threshold to determine the system's operating status. The threshold includes a first threshold and a second threshold; the first threshold is less than the second threshold; the first threshold and the second threshold are used to compare with the voltage value. The operating states include non-use state, low-power use state, and normal use state; The condition for determining the non-use state is that the voltage value is less than or equal to the first threshold; the system does not work when it is in the non-use state. The condition for determining a low-power usage state is that the voltage value is greater than the first threshold and less than the second threshold; when in a low-power usage state, the system reduces power consumption. When the system is in a low-power operation state, the operating parameters are adjusted based on the voltage value to reduce system power consumption; the operating parameters include the wireless transmission and reception interval and the operating frequency of the system clock; The broadcast cycle time of Bluetooth satisfies T≥I BT / (f(V OC / K)-I L ), where T represents the broadcast cycle time, I BT f(V) represents the average current for Bluetooth broadcasts once per second. OC / K) represents the relationship between light intensity and the converted current, V OC The open-circuit voltage of the photovoltaic panel is represented by K, which represents the linearity exponent, and I is the linearity index. L This represents the system bottom current; and T≥T TH When this happens, the system enters shutdown mode. TH Indicates the third threshold; The condition for determining normal operating status is that the voltage value is greater than or equal to the second threshold; the system works normally when it is in normal operating status. The photovoltaic panel, the photoelectric conversion unit, the voltage acquisition unit, and the processor unit are all located inside the electronic paper table sign.

2. The photovoltaic electronic paper nameplate system according to claim 1, characterized in that, It also includes an energy storage unit; the energy storage unit is connected to the photoelectric conversion unit; when the system is in normal use, some of the electrical energy is in excess, and the energy storage unit stores the excess electrical energy.

3. The photovoltaic electronic paper nameplate system according to claim 2, characterized in that, It also includes a photovoltaic wake-up unit, which is connected to the photovoltaic panel and the processor unit respectively; the photovoltaic wake-up unit is used to wake up the processor unit when it is not in use according to the light intensity.

4. A method for operating the photovoltaic electronic paper nameplate system according to claim 3, characterized in that, Including the following steps: Step 1: Power on the system; Light intensity is obtained based on the photovoltaic panel; Step 2: The photoelectric conversion unit converts the energy of light intensity into electrical energy; Step 3: The processor unit periodically acquires the open-circuit voltage value of the photovoltaic panel and records it as V. I And set a first threshold and a second threshold, with the first threshold denoted as V. L The second threshold is denoted as V. H ; Step 4: As the light intensity increases, the voltage value is compared with the first threshold and the second threshold to obtain different working states; When V I ≤V L When the system is in a non-use state, power consumption is extremely low. When V L <V I <V H When the system is in a low-power operation state, the system dynamically adjusts its operating parameters based on the constantly changing voltage value to reduce system power consumption. When V I ≥V H When the system is in normal operation, and there is excess electrical energy, the remaining electrical energy is stored by the energy storage unit.

5. The working method of the photovoltaic electronic paper nameplate system according to claim 4, characterized in that, Step 4 further includes: when the voltage value is greater than the first threshold, the photovoltaic wake-up unit obtains startup energy and generates a wake-up signal based on the startup energy; the wake-up signal is used to wake up the processor unit to restore its usage state.

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