An intelligent window control system and control method based on electrochromic device

Abstract

The application discloses an intelligent window control system and control method based on an electrochromic device, and belongs to the technical field of photoelectric intelligent control. The system comprises a temperature sensor, an electrochromic device, an electric quantity detection circuit, a controller and a power supply control module. Firstly, the average electric charge value required by the electrochromic device for coloring to different coloring states is tested by the electric quantity detection circuit in different temperature intervals and stored in the controller. During the coloring process of the device by using a constant voltage, the cumulative electric quantity of the device after the voltage is applied is monitored in real time by the electric quantity detection circuit. When the cumulative electric quantity of the color change reaches a target electric quantity, the device reaches the set target coloring state, and then the system is switched to pulse voltage for power supply. The device is kept in the set target coloring state by using appropriate pulse voltage. The application provides a solution to the problem that the electrochromic device is difficult to be freely controlled when applied to a building intelligent window.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic intelligent control technology, and more specifically to an intelligent window control system and control method based on electroluminescent devices. Background Technology

[0002] With rapid economic development, conventional energy resources such as coal and oil are being depleted, and environmental pollution is intensifying. To achieve sustainable economic development, energy conservation has become paramount. Buildings account for nearly 30% of total social energy consumption, making energy conservation in buildings increasingly important. Electrochromic smart windows, as a type of intelligent glass technology that actively adjusts light transmittance, utilize electrochromism (EC). Electrochromism refers to the process by which the transmittance, reflectance, or absorptivity of a material in the ultraviolet, visible, and / or near-infrared regions changes steadily under the influence of an applied electric field. This is visually manifested as a reversible change in the material's color and transparency. Under the influence of an electric field, electrochromic smart windows selectively absorb or reflect external heat radiation by adjusting light absorption and transmission, and prevent internal heat from dissipating outwards. This reduces the significant energy consumption required for cooling in summer and heating in winter in buildings such as office buildings and residences. Electrochromic smart windows are a new type of electrochromic technology that can both block visible sunlight and effectively reflect solar radiation. They can reversibly switch between transparent, dark, and mirror-reflective states.

[0003] However, existing electroreflective devices (ERDs) suffer from the self-dissolving properties of their deposited silver mirror reflective surfaces. When voltage is applied, they transition from a transparent state to a dark state and then gradually to a specular reflective state, only to revert to a transparent state upon de-energization. They cannot maintain a specific transmittance level for an extended period. Furthermore, the transition speed of ERDs is highly dependent on the temperature of the user's terminal device; under different conditions, the same duration of voltage results in different coloring states, making it difficult to freely control according to the user's requirements.

[0004] Therefore, how to provide a smart window control system and control method based on electroluminescent devices to achieve free control and maintain a stable effect on the coloring and heat insulation state of electroluminescent smart windows is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a smart window control system and method based on an electroluminescent device, which solves the problem in the prior art that the user-set coloring and heat insulation state cannot be accurately reached and maintained for a long time when a constant voltage is applied. It achieves free control and stable maintenance of the coloring and heat insulation state of the electroluminescent smart window.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A smart window control system based on an electroluminescent device, based on a user terminal, includes: a temperature sensor, an electroluminescent device, a power detection circuit, a controller, and a power supply control module;

[0008] The temperature sensor detects the ambient temperature and the actual temperature of the electroluminescent device. Under different temperature ranges, the power detection circuit tests the average charge value required for the electroluminescent device to be colored to different color states, and stores the average charge value as the target power in the controller.

[0009] When a user command is input to the controller from the user terminal to a target coloring state, the power supply control module colors the electroluminescent device with a constant voltage. The power detection circuit detects the cumulative power of the electroluminescent device after the voltage is applied in real time. When the cumulative power reaches the target power, the electroluminescent device reaches the set target coloring state. The power supply control module then switches to a preset pulse voltage to supply power, and the preset pulse voltage keeps the electroluminescent device in the set target coloring state.

[0010] Preferably, it further includes a wireless transmission module disposed between the user terminal and the controller, for wirelessly transmitting user commands generated by the user terminal to the controller.

[0011] Preferably, the electroluminescent device has a sandwich structure, comprising: a second electrode layer, an electrolyte layer, and a first electrode layer arranged from bottom to top;

[0012] Wherein, the first electrode layer and the second electrode layer are transparent materials with high electrical conductivity;

[0013] The electrolyte layer is an electrodeposable metal cation material;

[0014] Under constant voltage, electrodeposable metal cations in the electrolyte are reduced to elemental metals and deposited onto the first or second electrode layer to form a highly reflective metal film.

[0015] Preferably, the power detection circuit includes a sample-and-hold circuit, a buffer, a current mirror circuit, a galvanometer, and an integrator circuit connected in series.

[0016] The power supply control module is connected to the electroluminescent device via resistor R1.

[0017] The sample-and-hold circuit is connected in parallel with the resistor R1 to sample the voltage across the resistor R1 and hold the sampled voltage.

[0018] The buffer buffers the output of the sample-and-hold circuit and generates a current proportional to the sampled voltage as the input current of the current mirror circuit.

[0019] The current mirror circuit receives the input current and outputs a mirrored current;

[0020] The ammeter and integrator circuit are connected to the controller, sense the mirror current, and integrate the sensed mirror current over time to generate a cumulative charge value.

[0021] Preferably, the sample-and-hold circuit includes: a voltage sampling module and a capacitor C1;

[0022] The voltage sampling module periodically samples the voltage across the resistor R1 and maintains the sampled voltage across the capacitor C1.

[0023] Preferably, the buffer includes: operational amplifier A1, resistor R2, transistor Q1, and transistor Q2;

[0024] Wherein, the positive input terminal of the operational amplifier A1 receives the sampled voltage, the negative input terminal of the operational amplifier A1 is connected to the output terminal of the transistor Q1, and the output terminal of the operational amplifier A1 is connected to the control terminal of the transistor Q1;

[0025] The resistor R2 is connected between the output terminal of the transistor Q1 and ground;

[0026] The control terminal and output terminal of transistor Q2 are connected together, and the input terminal of transistor Q2 is connected to a positive voltage to form a current source.

[0027] Preferably, the formula for the duty cycle of the preset pulse voltage is:

[0028] η = t1 / (t1+t2) = -V b / (V a -V b );

[0029] V a *t1=-V b *t2;

[0030] In the formula, t1 is the duration of the low-level signal, t2 is the duration of the low-level signal, and V a and V b Let be the slope at points a and b on the transmittance curve.

[0031] A smart window control method based on an electroluminescent device includes:

[0032] S100: Determines the target coloring state by receiving user instructions from the user terminal through the controller;

[0033] S200: The temperature detected by the temperature sensor is transmitted to the controller, which then determines the temperature range.

[0034] S300: Determine the average charge value required for the color change to the target coloring state within the temperature range, and use the average charge value as the target charge value;

[0035] S400: The power supply control module colors the electroluminescent device with a constant voltage;

[0036] S500: The power detection circuit continuously monitors the accumulated power of the electroluminescent device after voltage application, and determines whether the accumulated power has reached the target power. If not, it returns to S200 to redetermine the temperature range; if so, then:

[0037] S600: When the electroluminescent device reaches the set target coloring state, the controller determines whether it has received a user instruction from the user terminal to maintain the target coloring state. If not, the control ends; if yes, then:

[0038] S700: The power supply control module switches to a preset pulse voltage for power supply;

[0039] S800: Determines the duty cycle of the pulse voltage under the target coloring state;

[0040] S900: The electroluminescent device is kept in the set target coloring state by the duty cycle of the pulse voltage.

[0041] Preferably, S300 includes: different temperature ranges, different coloring targets corresponding to different temperature ranges, and a charge value corresponding to each coloring target, which are pre-stored in the controller to determine the average charge value required for color change to the target coloring state under the temperature range, and the average charge value is used as the target charge.

[0042] Preferably, the duty cycle formula for the pulse voltage in S800 is:

[0043] η = t1 / (t1+t2) = -V b / (V a -V b );

[0044] V a *t1=-V b *t2;

[0045] In the formula, t1 is the duration of the low-level signal, t2 is the duration of the low-level signal, and V a and V b Let be the slope at points a and b on the transmittance curve.

[0046] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses a smart window control system and control method based on electroluminescent devices, which can adjust the smart window to a specific transmittance according to the user's needs, corresponding to a specific heat insulation capacity, and maintain a constant value for a long time, thus solving the problem of difficulty in freely controlling electroluminescent devices (ERD) when applied to building smart windows. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the system structure of the present invention;

[0049] Figure 2 This is a schematic diagram of the pulse voltage under the pulse power supply mode of the present invention;

[0050] Figure 3 This is a schematic diagram showing the change in transmittance over time during the operation of the electroluminescent device of the present invention.

[0051] Figure 4 This is a schematic diagram of the electroluminescent device structure of the present invention;

[0052] Figure 5 This is a schematic diagram of the method flow of the present invention;

[0053] Figure 6 This is a schematic diagram illustrating the effect of the electroluminescent device controlled by the present invention;

[0054] Figure 7 This is an application effect diagram of Embodiment 2 of the present invention. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0056] The purpose of this invention is to provide a smart window control system and method based on an electroluminescent device. This system includes a temperature sensor, an electroluminescent device, a charge detection circuit, a controller, and a power supply control module. First, at different temperature ranges, the charge detection circuit of this invention tests the average charge value Q_target required for the electroluminescent device to achieve different coloring states, and stores this value in the controller (different coloring states include LV0 to LV10, specifically LV0 represents 100% relative transmittance, LV1 represents 90% relative transmittance, LV2 represents 80% relative transmittance, and so on, with LV10 representing 0.1% relative transmittance, which can be understood as the coloring limit of the device). During system operation, while coloring the device with a constant voltage, the charge detection circuit monitors the cumulative charge Q of the device in real time after the voltage is applied. When the cumulative charge Q reaches the target charge Q_target, the device reaches the set target coloring state. The system then switches to pulse voltage for power supply, using appropriate pulse voltages to keep the device in the set target coloring state. This provides a solution to the problem of difficulty in freely controlling electroluminescent devices (ERDs) applied to building smart windows.

[0057] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] Example 1

[0059] See Figure 1 As shown, Embodiment 1 of the present invention discloses an intelligent window control system and control method based on an electroluminescent device, which is based on a user terminal and includes: a temperature sensor, an electroluminescent device, a power detection circuit, a controller, and a power supply control module;

[0060] Among them, the temperature sensor detects the ambient temperature and the actual temperature of the electroluminescent device. Under different temperature ranges, the power detection circuit tests the average charge value required for the electroluminescent device to be colored to different color states, and stores the average charge value as the target power in the controller.

[0061] When a user command is input to the controller from the user terminal to a target coloring state, the power supply control module colors the electroluminescent device with a constant voltage. The power detection circuit detects the cumulative power of the electroluminescent device after the voltage is applied in real time. When the cumulative power reaches the target power, the electroluminescent device reaches the set target coloring state. The power supply control module then switches to a preset pulse voltage to supply power. Through the preset pulse voltage, the electroluminescent device is kept in the set target coloring state.

[0062] Specifically, the temperature sensor detects the ambient temperature and the actual temperature of the electroluminescent device, and sets a series of temperature ranges, such as: 10℃-12℃, 12℃-14℃, 14℃-16℃, 16℃-18℃, 18℃-20℃, 20℃-22℃, 22℃-24℃, 24℃-26℃, 26℃-28℃, 28℃-30℃, 30℃-32℃, 32℃-34℃, 34℃-36℃. The amount of charge required to change color to different colored targets (LV1-LV10) in each temperature range is obtained, the information is stored in the controller, and set to different levels.

[0063] Specifically, the required charge value corresponds to different coloring states (which are actually different transmittances), including LV0 to LV10. LV0 can be represented as 100% relative transmittance, LV1 as 90% relative transmittance, LV2 as 80% relative transmittance, and so on. LV10 can be represented as 0.1% relative transmittance.

[0064] In one specific embodiment, the sample-and-hold circuit includes: a voltage sampling module and a capacitor C1;

[0065] The voltage sampling module periodically samples the voltage across resistor R1 and holds the sampled voltage across capacitor C1.

[0066] Specifically, the voltage sampling module periodically samples the voltage VR1 across resistor R1 to generate a sampling voltage V2. Capacitor C1 is used to store or retain the sampling voltage V2 generated by the sampling module.

[0067] The power detection circuit includes a sample-and-hold circuit, a buffer, a current mirror circuit, a galvanometer, and an integrator circuit connected in series.

[0068] The power supply control module is connected to the electroluminescent device via resistor R1.

[0069] The sample-and-hold circuit is connected in parallel with resistor R1 to sample the voltage across resistor R1 and hold the sampled voltage.

[0070] The buffer buffers the output of the sample-and-hold circuit and generates a current proportional to the sampled voltage as the input current of the current mirror circuit.

[0071] The current mirror circuit receives the input current and outputs a mirrored current.

[0072] The ammeter and integrator circuit are connected to the controller to sense the mirror current and integrate the sensed mirror current over time to generate a cumulative charge value.

[0073] Specifically, this invention innovatively uses a topology structure, utilizing sample-and-hold circuits, buffers, and current mirror circuits to minimize the influence of external circuits (electricity detection system) on the device color state transition process, and ensures accurate and stable replication of the current flowing through the device.

[0074] In one specific embodiment, the buffer is a unity-gain buffer, comprising: operational amplifier A1, resistor R2, transistor Q1, and transistor Q2; wherein, the positive input terminal of operational amplifier A1 receives the sampling voltage V2, the negative input terminal of operational amplifier A1 is connected to the output terminal of transistor Q1, the output terminal of operational amplifier A1 is connected to the control terminal of transistor Q1, the resistor is connected between the output terminal of transistor Q1 and ground, and transistor Q2 is a PMOS transistor, its input terminal is connected to V+, and its control terminal and output terminal are connected together, making transistor Q2 a current source. The current I2 generated by the voltage drop across transistor Q2 is provided to the buffer circuit. As before, the buffer circuit controls I2 so that the voltage across resistor R2 is equal to the voltage across resistor R1. Therefore, the current I2 is approximately the current through the electroluminescent device ERD.

[0075] Specifically, a buffer can buffer the output of the sample-and-hold circuit and generate a current I2 proportional to the sampled voltage V2. A unity-gain buffer ensures that the voltage V2 across resistor R2 is proportional to the voltage VR1 across resistor R1, and remains essentially the same when the gain of the differential amplifier in the sample-and-hold circuit is 1. Thus, the current I2 is proportional to the current I flowing through R1, as expressed by the formula:

[0076]

[0077] In one specific embodiment, the current mirror circuit receives the input current and provides a precise mirror current for the output, i.e., it replicates the current I2 to the output terminal, which is connected to a galvanometer and an integrator circuit. The galvanometer and integrator circuit includes a galvanometer and an integrator. The galvanometer senses the input current, while the integrator receives the galvanometer's output and integrates it over time to generate a cumulative charge value "Q," which equals the amount of charge transferred to the electroluminescent device within a given time period. Upon receiving the charge value "Q," the controller sends a signal to the power supply control system when the cumulative charge "Q" reaches the target charge Q_target, causing it to switch to pulse power supply mode.

[0078] Specifically, the power supply control module has two power supply modes: pulse power supply mode and constant voltage power supply mode. The normal power supply mode is the constant voltage power supply mode, where a constant voltage is applied across the electrochromic device. The pulse power supply mode, on the other hand, generates pulse voltages with adjustable duty cycles. The pulse voltage duty cycle is set on the controller, which then controls the pulse power supply mode based on the pulse voltage duty cycle. For example... Figure 2 As shown, the high-level duration is t1, the low-level duration is t2, and the duty cycle is η = t1 / (t1 + t2).

[0079] like Figure 3 The diagram illustrates the transmittance change over time during the operation of an electroluminescent device. Specifically, it shows the process of applying a constant voltage, allowing the color to fully develop, and then removing the voltage to allow the color to fade. The process of transmittance decreasing from 100% to 0.1% represents the coloring curve when the voltage is applied, while the process of transmittance increasing from 0.1% to 100% represents the fading curve after the voltage is removed. The coloring and fading curves correspond to points a and b at 40% transmittance, respectively, with a slope v. a This represents the slope value at point a, where the slope is v. b This represents the slope value at point b.

[0080] Specifically, this curve rate can be obtained by spectrometer measurement. The horizontal axis represents time, and the vertical axis represents transmittance. The slope of this curve can represent the coloring rate and the self-fading rate. The transmittance of electroluminescent devices is adjustable from 100% to 0.1%. Therefore, when we use a spectrometer to measure the transmittance to be one of LV0 to LV10, such as LV8, which corresponds to a transmittance of 20%, the charge detection circuit detects the charge value at this time and stores it in the controller.

[0081] In one specific embodiment, the pulse voltage duty cycle is set on the controller, and then the controller controls the pulse power supply module according to the pulse voltage duty cycle. The specific algorithm for setting the pulse voltage duty cycle is as follows, for example... Figure 3 When the transmittance is LV6 (40%), the coloring rate v can be obtained from the slopes at points a and b on the curve corresponding to this transmittance. a And because of v b If it is a negative value, the self-fading rate is expressed as -v. b To ensure a dynamic balance between coloring and self-fading in this state, thereby maintaining the user-defined coloring state, the following formula must be satisfied:

[0082] V a *t1=-V b *t2;

[0083] Therefore, the pulse voltage duty cycle is set to...

[0084] η = t1 / (t1+t2) = -V b / (V a -V b );

[0085] During the application of such pulsed voltage, the electroluminescent device achieves dynamic maintenance of its color state.

[0086] Specifically, it also includes a wireless transmission module (not shown in the figure), which is set between the user terminal and the controller to wirelessly transmit user commands generated by the user terminal to the controller.

[0087] Specifically, the wireless transmission module can integrate a Bluetooth module, Zigbee, or WIFI module to enable remote control of the smart window.

[0088] In one specific embodiment, see Figure 4 As shown, the electroluminescent device has a sandwich structure, including: a second electrode layer, an electrolyte layer, and a first electrode layer arranged from bottom to top;

[0089] The first electrode layer and the second electrode layer are tin-doped indium oxide electrode layers;

[0090] The electrolyte layer is an electrodeposable metal cation electrolyte layer;

[0091] Under constant voltage, electrodeposable metal cations in the electrolyte are reduced to elemental metals and deposited onto the first or second electrode layer to form a highly reflective metal film.

[0092] Specifically, the working principle of an electroluminescent device is as follows: under the action of a constant voltage, Ag in the electrolyte... + The ions are reduced to elemental metals, which are deposited on the first or second electrode layer to form a highly reflective metal film. If the voltage applied to the electrodes is stopped, the elemental metals gradually dissolve into the electrolyte layer, restoring the device to its transparent state.

[0093] Specifically, the Ag+ in the electrolyte mentioned in this invention can be replaced with Cu. 2+ Bi 3+ Ni 2+ Fe 2+ Zn 2+ Cr 3+ Co 2 + Au 3+ Pt 2+ Sn 2+ Cd 2+ Pb 2+Electrodepositable metal cations are also possible. The control system remains applicable, but the transparent electrode layer can be replaced with fluorine-doped tin oxide films and aluminum-doped zinc oxide, iron oxide, zinc oxide (ZnO) nanowire arrays, conductive polymers such as polyaniline and polythiophene, metal nanomesh, graphene, metal nanoparticles, carbon nanotubes, and other materials with high conductivity and good light transmittance.

[0094] On the other hand, see Figure 5 As shown, a smart window control method based on an electroluminescent device includes:

[0095] S100: Determines the target coloring state by receiving user instructions from the user terminal through the controller;

[0096] S200: The temperature detected by the temperature sensor is transmitted to the controller, which then determines the temperature range.

[0097] Specifically, different temperature ranges, different coloring targets corresponding to different temperature ranges, and a charge value corresponding to each coloring target are pre-stored in the controller. These are used to determine the average charge value required for the color change to the target coloring state within the temperature range, and the average charge value is used as the target charge value.

[0098] First, the coloring target is set by the user terminal as LV0 to LV10. Specifically, LV0 represents 100% relative transmittance, LV1 represents 90% relative transmittance, LV2 represents 80% relative transmittance, and so on. LV10 represents 0.1% relative transmittance, which can be understood as the coloring limit of the device.

[0099] S300: Determine the average charge value required for the color change to the target color state within the temperature range, and use the average charge value as the target charge value;

[0100] Specifically, each shaded target corresponds to a charge value, which is in Figure 3 The controller stores the real-time charge value detected by the voltage sampling circuit, buffer, current mirror circuit, ammeter and integration circuit in the charge detection circuit. It compares the value stored in the controller with the value. If they are the same, it means that the amount of charge Q_target required to achieve the coloring target is determined.

[0101] S400: The power supply control module uses a constant voltage to color the electroluminescent device. Specifically, in constant voltage power supply mode, current is applied to the electroluminescent device to color it.

[0102] S500: The power detection circuit detects the cumulative power of the electroluminescent device after voltage application in real time, and determines whether the cumulative power has reached the target power. If not, it returns to S200 to redetermine the temperature range; if so, then:

[0103] S600: When the electroluminescent device reaches the set target color state, the controller determines whether it has received a user command from the user terminal to maintain the target color state. If not, the control ends; if so, then:

[0104] S700: The power supply control module switches to a preset pulse voltage for power supply;

[0105] S800: The formula for determining the duty cycle of the pulse voltage under the target coloring state is:

[0106] η = t1 / (t1+t2) = -V b / (V a -V b );

[0107] V a *t1=-V b *t2;

[0108] In the formula, t1 is the duration of the low-level signal, t2 is the duration of the low-level signal, and V a and V b is the slope at points a and b on the transmittance curve;

[0109] S900: The electroluminescent device is kept in the set target coloring state by the duty cycle of the pulse voltage.

[0110] This invention discloses a smart window control system and method based on an electroluminescent device. It allows the smart window to be adjusted to a specific transmittance, corresponding to a specific heat insulation capability, and maintained constant over a long period, solving the problem of difficulty in freely controlling existing ERD (Electronic Reflective Device) applications in building smart windows. If the user wants to maintain visibility of the outside view while blocking light and insulating heat, the transmittance of the smart window can be adjusted to maintain it within different ranges from 10% to 80%. As shown in the schematic diagram of transmittance changing over time, the transmittance decreases from 100% at LV0 to 30% at LV7 during operation and remains in this state for a long time. Conversely, if the user wants the electroluminescent smart window to maintain a fully light-blocking and heat-insulating mirror-reflective state, the transmittance can be adjusted to maintain a 0.1% mirror-reflective state. This effectively slows down the rise in indoor temperature during hot summers, reducing energy consumption from air conditioning, and achieves intelligent heat preservation during cold winters. Furthermore, the application of this invention allows the electroluminescent smart window to maintain a good mirror surface. See also... Figure 6 The diagram shown illustrates the effect of controlling the electroluminescent device to reduce its transmittance from 100% to 30% while maintaining the transmittance.

[0111] Example 2

[0112] The following is a detailed description of the application effects of an intelligent window control system and control method based on an electroluminescent device, as provided in Embodiment 2 of the present invention:

[0113] For details, see Figure 7 As shown, a smart window equipped with an electroluminescent device is installed on a building and has a temperature sensor. Users can configure the electroluminescent smart window control system through a user terminal, controlling the window's transmittance as needed. In the midday heat of summer, direct sunlight enters the house, causing a rapid rise in indoor temperature. Air conditioning consumes a significant amount of electricity, which is detrimental to energy conservation and environmental protection. Using the electroluminescent smart window control system, users can control the window to maintain an appropriate tinting state. For example, if the user wants to block light while still seeing the view outside, they can set the window from transparent to a dark state with 40% transmittance and maintain this state. If the user wants complete light blocking and heat insulation, they can set the window to a specular reflective state with 0.1% transmittance, effectively slowing down the rise in indoor temperature and reducing the energy consumption of air conditioning. Since the window becomes specularly reflective after complete tinting, it has a reflectivity of over 99% for infrared radiation. In cold winters, this invention can also control the window to regulate the reflection of infrared radiation, making it less likely for indoor heat to dissipate through the window, thus achieving intelligent indoor heat preservation. In addition, by applying this invention, users can hopefully abandon curtains, freely control the intensity of indoor light and solar radiation during the day, and protect indoor privacy at night.

[0114] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0115] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A smart window control system based on an electroluminescent device, based on a user terminal, characterized in that, include: Temperature sensor, electroluminescent device, power detection circuit, controller, and power supply control module; The temperature sensor detects the ambient temperature and the actual temperature of the electroluminescent device. Under different temperature ranges, the power detection circuit tests the average charge value required for the electroluminescent device to be colored to different color states, and stores the average charge value as the target power in the controller. When a user command is input to the controller from the user terminal to a target coloring state, the power supply control module colors the electroluminescent device with a constant voltage. The power detection circuit detects the cumulative power of the electroluminescent device after the voltage is applied in real time. When the cumulative power reaches the target power, the electroluminescent device reaches the set target coloring state. The power supply control module then switches to a preset pulse voltage for power supply. Through the preset pulse voltage, the electroluminescent device is kept in the set target coloring state. The power detection circuit includes a sample-and-hold circuit, a buffer, a current mirror circuit, a galvanometer, and an integrator circuit connected in series. The power supply control module is connected to the electroluminescent device via resistor R1. The sample-and-hold circuit is connected in parallel with the resistor R1 to sample the voltage across the resistor R1 and hold the sampled voltage. The buffer buffers the output of the sample-and-hold circuit and generates a current proportional to the sampled voltage as the input current of the current mirror circuit. The current mirror circuit receives the input current and outputs a mirrored current; The ammeter and integrator circuit are connected to the controller, sense the mirror current, and integrate the sensed mirror current over time to generate a cumulative charge value.

2. The intelligent window control system based on an electroluminescent device according to claim 1, characterized in that, It also includes a wireless transmission module, which is disposed between the user terminal and the controller, for wirelessly transmitting user commands generated by the user terminal to the controller.

3. The intelligent window control system based on an electroluminescent device according to claim 1, characterized in that, The electroluminescent device has a sandwich structure, comprising: a second electrode layer, an electrolyte layer, and a first electrode layer arranged from bottom to top; Wherein, the first electrode layer and the second electrode layer are transparent materials with high electrical conductivity; The electrolyte layer is an electrodeposable metal cation material; Under constant voltage, electrodeposable metal cations in the electrolyte are reduced to elemental metals and deposited onto the first or second electrode layer to form a highly reflective metal film.

4. The intelligent window control system based on an electroluminescent device according to claim 1, characterized in that, The sample-and-hold circuit includes: a voltage sampling module and a capacitor C1; The voltage sampling module periodically samples the voltage across the resistor R1 and maintains the sampled voltage across the capacitor C1.

5. The intelligent window control system based on an electroluminescent device according to claim 1, characterized in that, The buffer includes: operational amplifier A1, resistor R2, transistor Q1, and transistor Q2; Wherein, the positive input terminal of the operational amplifier A1 receives the sampled voltage, the negative input terminal of the operational amplifier A1 is connected to the output terminal of the transistor Q1, and the output terminal of the operational amplifier A1 is connected to the control terminal of the transistor Q1; The resistor R2 is connected between the output terminal of the transistor Q1 and ground; The control terminal and output terminal of transistor Q2 are connected together, and the input terminal of transistor Q2 is connected to a positive voltage to form a current source.

6. The intelligent window control system based on an electroluminescent device according to claim 1, characterized in that, The formula for the duty cycle of the preset pulse voltage is: In the formula, The duration of the high-level signal. The duration of the low-level signal. and Let be the slope at points a and b on the transmittance curve.

7. A method for controlling an intelligent window based on an electroluminescent device using the intelligent window control system based on an electroluminescent device as described in any one of claims 1-6, characterized in that, include: S100: Determines the target coloring state by receiving user instructions from the user terminal through the controller; S200: The temperature detected by the temperature sensor is transmitted to the controller, which then determines the temperature range. S300: Determine the average charge value required for the color change to the target coloring state within the temperature range, and use the average charge value as the target charge value; S400: The power supply control module colors the electroluminescent device with a constant voltage; S500: The power detection circuit continuously monitors the accumulated power of the electroluminescent device after voltage application, and determines whether the accumulated power has reached the target power. If not, it returns to S200 to redetermine the temperature range; if so, then: S600: When the electroluminescent device reaches the set target coloring state, the controller determines whether it has received a user instruction from the user terminal to maintain the target coloring state. If not, the control ends; if yes, then: S700: The power supply control module switches to a preset pulse voltage for power supply; S800: Determines the duty cycle of the pulse voltage under the target coloring state; S900: The electroluminescent device is kept in the set target coloring state by the duty cycle of the pulse voltage.

8. The intelligent window control method based on an electroluminescent device according to claim 7, characterized in that, The S300 includes: different temperature ranges and different coloring targets corresponding to different temperature ranges, and a charge value corresponding to each coloring target, which are pre-stored in the controller to determine the average charge value required for color change to the target coloring state under the temperature range, and the average charge value is used as the target charge value.

9. The intelligent window control method based on an electroluminescent device according to claim 7, characterized in that, The duty cycle formula for the pulse voltage in the S800 is as follows: In the formula, The duration of the high-level signal. The duration of the low-level signal. and Let be the slope at points a and b on the transmittance curve.

Images