Voltage control method and voltage control device for electrochromic device

Abstract

This application discloses a voltage control method and device for an electrochromic device. The method includes: applying a driving voltage to the electrochromic device; acquiring the membrane voltage at various test points on the electrochromic device; and adjusting the driving voltage according to the membrane voltage to keep the membrane voltage within a preset safe voltage range. This application dynamically adjusts the driving voltage applied to the electrochromic device by real-time monitoring of the membrane voltage changes during the charging and discharging process, ensuring that the membrane voltage remains within a safe voltage range. This solves the problem in existing technologies where, due to environmental changes or aging of the electrochromic device, the externally applied driving voltage may exceed the safe range, causing damage to the electrochromic device. This effectively extends the service life of the electrochromic device, ensuring stable operation in various environments and improving the color-changing speed.

Description

Technical Field

[0001] This application relates to the field of electrochromic technology, and in particular to a voltage control method and voltage control device for an electrochromic device. Background Technology

[0002] Electrochromic devices are instruments that can change their optical properties by applying a voltage, and are widely used in smart windows, displays, and automotive rearview mirrors. These devices typically include one or more electrochromic films (EC films), which can change color or transparency under different voltages. In existing technology, electrochromic devices operate by applying a voltage to the EC film from an external power source, thereby altering its optical properties.

[0003] However, in practical applications, electrochromic devices do not monitor the actual voltage on the EC diaphragm during charging and discharging. This means that when environmental conditions change (such as changes in temperature, humidity, etc.) or the diaphragm ages, it is impossible to detect situations where the actual voltage on the EC diaphragm is too high or too low in a timely manner. This can easily lead to situations where the actual voltage of the EC diaphragm exceeds its safe voltage range under the influence of the driving voltage applied by the external power supply, resulting in damage to the EC diaphragm or a decline in its performance. Summary of the Invention

[0004] In view of this, in order to solve the problems existing in the prior art, this application provides a voltage control method and voltage control device for an electrochromic device.

[0005] In a first aspect, this application provides a voltage control method for an electrochromic device, comprising:

[0006] A driving voltage is applied to the electrochromic device;

[0007] Obtain the membrane voltage at each test point on the electrochromic device;

[0008] The driving voltage is adjusted according to the diaphragm voltage to keep the diaphragm voltage within a preset safe voltage range. The driving voltage includes a forward voltage or a reverse voltage. If the driving voltage is a forward voltage, the initial value of the forward voltage is greater than the upper limit of the safe voltage range. If the driving voltage is a reverse voltage, the initial value of the reverse voltage is less than the lower limit of the safe voltage range.

[0009] In an optional implementation, adjusting the driving voltage according to the diaphragm voltage includes:

[0010] The voltage control parameters are determined based on the diaphragm voltage and the driving voltage, and the driving voltage is controlled based on the voltage control parameters, wherein the voltage control parameters include the direction of change and the step size.

[0011] In an optional implementation, if the driving voltage is a positive voltage, adjusting the driving voltage according to the diaphragm voltage includes:

[0012] Determine whether the diaphragm voltage at any of the test points is greater than a preset first protection voltage; wherein the first protection voltage is not greater than the upper limit of the safe voltage range;

[0013] If so, then it is determined that the driving voltage is regulated in a first manner;

[0014] If not, then the driving voltage is determined to be regulated in a second manner;

[0015] The second method differs from the first method in that the second method includes maintaining or increasing the driving voltage, while the first method includes decreasing the driving voltage.

[0016] In an optional implementation, if the diaphragm voltage is not greater than the first protection voltage, then determining to regulate the driving voltage in a second manner further includes:

[0017] Determine whether the preset first target condition is met. If it is met, determine the second mode based on the current driving voltage. The first target condition includes the duration of the state in which the voltage change rate of the diaphragm voltage is greater than the preset first change rate within the first target time period being greater than the preset first duration.

[0018] In an optional implementation, determining the second method based on the current driving voltage includes:

[0019] Determine whether the current driving voltage is greater than the first preset voltage. If yes, the second method is to maintain the current driving voltage. If no, the second method is to increase the driving voltage according to the first step length. The first preset voltage is greater than the upper limit of the safe voltage range and less than the initial driving voltage.

[0020] In an optional implementation, the ratio of the first preset voltage to the upper limit of the safe voltage range is 4-6;

[0021] The ratio of the initial driving voltage to the upper limit of the safe voltage range is greater than or equal to 7.

[0022] In an optional implementation, if the diaphragm voltage is greater than the first protection voltage, then determining to regulate the driving voltage in a first manner further includes:

[0023] If the current driving voltage is greater than the second preset voltage, then the first method is to reduce the driving voltage according to the second step size;

[0024] If the current driving voltage is less than or equal to the second preset voltage and greater than the third preset voltage, then the first method is to reduce the driving voltage according to the third step size;

[0025] If the current driving voltage is less than or equal to the third preset voltage and greater than the fourth preset voltage, then the first method is to reduce the driving voltage according to the fourth step size;

[0026] The second preset voltage, the third preset voltage, and the fourth preset voltage decrease sequentially, as do the second step size, the third step size, and the fourth step size.

[0027] In an optional implementation, the ratio of the second preset voltage to the third preset voltage is 1.5-2.5;

[0028] The ratio of the third preset voltage to the fourth preset voltage is 1.5-2.5;

[0029] The ratio of the second step length to the third step length is 4-6;

[0030] The ratio of the third step length to the fourth step length is 2-3.

[0031] In an optional implementation, if the driving voltage is a reverse voltage, adjusting the driving voltage according to the diaphragm voltage includes:

[0032] Determine whether the diaphragm voltage at any of the test points is less than a preset second protection voltage; wherein the second protection voltage is not less than the lower limit of the safe voltage range;

[0033] If so, then it is determined that the driving voltage is regulated in a third manner;

[0034] If not, then the driving voltage is determined to be regulated in a fourth manner;

[0035] The fourth method differs from the third method in that it includes maintaining or reducing the driving voltage, while the third method includes increasing the driving voltage.

[0036] In an optional implementation, if the diaphragm voltage is not less than the second protection voltage, then determining to regulate the driving voltage in a fourth manner further includes:

[0037] Determine whether the preset second target condition is met. If it is met, determine the fourth mode based on the current driving voltage. The second target condition includes the duration of the state in which the voltage change rate of the diaphragm voltage is less than the preset second change rate during the second target time period being greater than the preset second duration.

[0038] In an optional implementation, determining the fourth method based on the current driving voltage includes:

[0039] Determine whether the current driving voltage is less than a fifth preset voltage. If yes, the fourth method is to maintain the current driving voltage. If no, the fourth method is to reduce the driving voltage according to a fifth step size. The fifth preset voltage is less than the lower limit of the safe voltage range and greater than the initial driving voltage.

[0040] In an optional implementation, the ratio of the fifth preset voltage to the lower limit of the safe voltage range is 7-9;

[0041] The ratio of the initial driving voltage to the lower limit of the safe voltage range is greater than or equal to 13.

[0042] In an optional implementation, if the diaphragm voltage is less than the second protection voltage, then determining to regulate the driving voltage in a third manner further includes:

[0043] If the current driving voltage is less than the sixth preset voltage, then the third method is to increase the driving voltage by the sixth step.

[0044] If the current driving voltage is greater than or equal to the sixth preset voltage and less than the seventh preset voltage, then the third method is to increase the driving voltage according to the seventh step size;

[0045] If the current driving voltage is greater than or equal to the seventh preset voltage and less than the eighth preset voltage, then the third method is to increase the driving voltage according to the eighth step size;

[0046] Among them, the sixth preset voltage, the seventh preset voltage and the eighth preset voltage increase sequentially, and the sixth step length, the seventh step length and the eighth step length decrease sequentially.

[0047] In an optional implementation, the ratio of the sixth preset voltage to the seventh preset voltage is 1.5-3;

[0048] The ratio of the seventh preset voltage to the eighth preset voltage is 1-2.5;

[0049] The ratio of the sixth step length to the seventh step length is 3-5;

[0050] The ratio of the seventh step length to the eighth step length is 2-3.

[0051] Secondly, this application provides a voltage control device for an electrochromic device, comprising:

[0052] A driver is used to apply a driving voltage to an electrochromic device;

[0053] A sampler is used to acquire the membrane voltage at each test point on the electrochromic device;

[0054] The processor is configured to adjust the driving voltage according to the diaphragm voltage so that the diaphragm voltage is within a preset safe voltage range;

[0055] The driver is also used to apply the regulated driving voltage to the electrochromic device, wherein the driving voltage includes a forward voltage or a reverse voltage. If the driving voltage is a forward voltage, the initial value of the forward voltage is greater than the upper limit of the safe voltage range; if the driving voltage is a reverse voltage, the initial value of the reverse voltage is less than the lower limit of the safe voltage range.

[0056] The embodiments of this application have the following beneficial effects:

[0057] This application provides a voltage control method for an electrochromic device. By monitoring the changes in the membrane voltage of the electrochromic device during charging and discharging in real time, the method dynamically adjusts the driving voltage applied to the electrochromic device to ensure that the membrane voltage remains within a safe voltage range. This solves the problem in the prior art where, due to environmental changes or aging of the electrochromic device, the externally applied driving voltage may exceed the safe range, causing damage to the electrochromic device. This effectively extends the service life of the electrochromic device and ensures its stable operation in various environments. In addition, this embodiment can also increase the color-changing speed of the electrochromic device by dynamically adjusting the driving voltage, i.e., increasing the driving voltage as much as possible, while ensuring the safety of the electrochromic device. Attached Figure Description

[0058] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and therefore should not be considered as a limitation on the scope of protection of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0059] Figure 1a A schematic diagram of the electrochromic device is shown.

[0060] Figure 1b A schematic diagram of the electrochromic device is shown.

[0061] Figure 2 A schematic diagram of the voltage control device for the electrochromic device in an embodiment of this application is shown;

[0062] Figure 3This illustration shows a schematic diagram of the membrane voltage change of the electrochromic device during the charging and discharging process in an embodiment of this application.

[0063] Figure 4 This illustration shows a schematic diagram of the change in the positive voltage supplied by the driver to the electrochromic device in an embodiment of this application;

[0064] Figure 5 This illustration shows a schematic diagram of the change in the reverse voltage supplied by the driver to the electrochromic device in an embodiment of this application;

[0065] Figure 6 A schematic diagram of the voltage control system of the electrochromic device in an embodiment of this application is shown;

[0066] Figure 7 A schematic flowchart of the voltage control method for the electrochromic device in an embodiment of this application is shown. Detailed Implementation

[0067] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0068] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0069] In the following, the terms “comprising,” “having,” and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as excluding, firstly, the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more features, numbers, steps, operations, elements, components, or combinations thereof.

[0070] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0071] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0072] The following is combined Figures 1a to 6 This application provides a detailed description of some embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0073] like Figure 1a As shown, the electrochromic device involved in the various embodiments of this application includes a first substrate layer 110, a first conductive layer 120, an electrochromic layer 130, a second conductive layer 140, and a second substrate layer 150 stacked sequentially. The first substrate layer 110 and the second substrate layer 150 are "transparent substrates," which are made of optical-grade transparent materials, specifically flexible substrate materials such as PET (Polyester Film), cyclic olefin copolymers, or cellulose triacetate.

[0074] The first conductive layer 120 and the second conductive layer 140 are "transparent conductive layers". The materials of the transparent conductive layers can be indium-tin oxide (ITO), aluminum zinc oxide (AZO), fluorine-doped tin oxide (FTO), silver nanowires, graphene, carbon nanotubes, metal meshes or silver nanoparticles, etc.

[0075] The electrochromic layer 130 (i.e., the electrochromic film, EC film) generally includes an electrochromic layer 131 (i.e., the EC layer), an electrolyte layer 132 (i.e., the Ely layer), and an ion storage layer 133 (i.e., the IS layer) stacked sequentially. The electrochromic layer 131 contains an electrochromic material, and the ion storage layer 133 stores ions. When an electric current is applied, ions from the ion storage layer 133 transfer to the electrochromic layer 131, causing the electrochromic layer 131 to change color due to the absorption of these ions. The electrolyte layer 132, also known as the ion transfer layer, serves as the ion transfer channel.

[0076] The first conductive layer 120 is electrically contacted with an external terminal via a first busbar thereon, and the second conductive layer 140 is electrically contacted with another external terminal via a second busbar thereon. Thus, by connecting a power supply to the two external terminals, a driving voltage supplied by the power supply can be applied between the first conductive layer 120 and the second conductive layer 140, thereby changing the transmittance of the electrochromic device. In this application, the power supply can be provided by a voltage control device. The driving voltage causes ions to move between the electrochromic layer 131 and the ion storage layer 133, and to intercalate / extract or extract / intercalate between them, thereby changing the optical state of the electrochromic material in the electrochromic layer 131, and thus changing the transmittance of the electrochromic device, adjusting it between the colored state, intermediate state, and transparent state of the electrochromic device.

[0077] Generally, the color-changing speed can be accelerated by increasing the driving voltage applied to the electrochromic layer 130. However, an excessive driving voltage can damage the electrochromic device. Therefore, to prevent the film voltage of the electrochromic layer 130 from exceeding its safe operating range during the color-changing process, protective control of the film voltage is usually implemented.

[0078] However, current technologies generally do not monitor the actual membrane voltage of electrochromic devices, making it impossible to detect excessively high or low membrane voltages in a timely manner. This can lead to the membrane voltage exceeding the safe operating range due to changes in environmental conditions or aging of the electrochromic device, caused by the driving voltage applied by an external power source. This can result in damage or performance degradation of the electrochromic device. Furthermore, existing technologies lack a real-time feedback mechanism, failing to dynamically adjust the driving voltage of the external power source based on actual conditions. This results in a delayed response to voltage fluctuations and electrochemical processes, affecting the color-changing speed of the electrochromic device. In other words, current technologies lack effective protection against overcharging and over-discharging of electrochromic devices, and cannot prevent the impact on the safety of electrochromic devices caused by abnormal driving voltages due to power fluctuations, load changes, or other factors.

[0079] Furthermore, the inventors discovered that existing technologies typically apply a fixed voltage to the electrochromic device, which cannot adapt to the voltage requirements of the electrochromic device under different operating conditions. Consequently, when environmental conditions change or the electrochromic device ages, the fixed voltage supplied to the electrochromic device may no longer be the optimal operating voltage, easily leading to overvoltage or undervoltage situations and increasing the risk of damage to the electrochromic device.

[0080] Based on this, this application provides a voltage control device 200 for an electrochromic device. This device monitors the changes in the membrane voltage of the electrochromic device in real time during the charging and discharging process, and then dynamically adjusts the driving voltage applied to the electrochromic device to ensure that the membrane voltage is always within a safe voltage range. This solves the problem in the prior art where, due to environmental changes or aging of the electrochromic device, the externally applied driving voltage may exceed the safe range, causing damage to the electrochromic device. This effectively extends the service life of the electrochromic device and ensures that the electrochromic device can work stably in various environments.

[0081] Exemplary, such as Figure 2 As shown, the voltage control device 200 includes a driver 210, a sampler 220, and a processor 230.

[0082] The driver 210 applies a driving voltage to the electrochromic device to charge or discharge it. When the driver 210 applies a positive driving voltage to the electrochromic device, the electrochromic device charges. When the driver 210 applies a reverse driving voltage to the electrochromic device, the electrochromic device discharges. The reverse driving voltage is recorded as a negative voltage; that is, the smaller the reverse driving voltage, the larger its value, i.e., the larger the absolute value of the reverse driving voltage.

[0083] Sampler 220 is used to acquire the membrane voltage at each test point of the electrochromic device during charging or discharging. Processor 230 is used to adjust the driving voltage to keep the membrane voltage within a preset safe voltage range. Driver 210 is also used to apply the adjusted driving voltage to the electrochromic device. That is, after processor 230 determines the driving voltage, driver 210 outputs the corresponding driving voltage according to the driving voltage determined by processor 230.

[0084] In some embodiments of this application, multiple test points are first set on the electrochromic device, and a voltage detection lead is provided at each test point, which is connected to the sampler 220. The voltage detection lead is used to conduct the voltage at the corresponding test point to the sampler 220; optionally, the voltage detection lead can be any type of lead such as copper lead, silver lead, etc.

[0085] For example, please refer to Figure 1bIn one embodiment, the electrochromic device includes a first detection point 11 and a second detection point 12. The first detection point 11 extends from the first substrate layer 110 to the surface of the second conductive layer 140, and the second detection point 12 extends from the second substrate layer 150 to the surface of the first conductive layer 120. The first detection point 11 and the second detection point 12 are detection grooves, and the bottom of the groove of the first detection point 11 and the bottom of the groove of the second detection point 12 are respectively used for electrical connection with two electrodes of the detection device.

[0086] In one embodiment, the electrochromic device includes a busbar located at its edge, and a first detection point 11 and a second detection point 12 are spaced apart along the extension direction of the busbar. Further, the interval between the first detection point 11 and the second detection point 12 is 1mm-10mm.

[0087] The sampler 220 obtains the voltage at the corresponding test point during the color change of the electrochromic device through the voltage detection lead; the voltage at each test point can be recorded as the membrane voltage.

[0088] In some examples, the upper and lower limits of the preset safe voltage range are related to the electrochemical characteristics of the electrochromic film, and each electrochromic material has a specific operating voltage range. In practical applications, the upper and lower limits of the safe voltage range can be set according to the specific material characteristics of the electrochromic film and the application environment. For example, the upper limit of the preset safe voltage range when the electrochromic device is charging can be 1.3V, and the lower limit of the preset safe voltage range when the electrochromic device is discharging can be -0.6V.

[0089] In this embodiment of the application, the processor 230 may be an integrated circuit chip with signal processing capabilities.

[0090] In some examples, the voltage control device 200 also includes a memory, which may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable read-only memory (EPROM), electrically erasable read-only memory (EEPROM), etc. The memory stores computer programs, which the processor 230 can execute upon receiving execution instructions.

[0091] In one embodiment, the driver 210 integrates a signal receiver for receiving a drive signal, which instructs the driver 210 to charge or discharge the electrochromic device. This drive signal can be sent by a host computer or processor 230, including but not limited to a terminal platform 300. Alternatively, the drive signal may also include indication information such as the magnitude, direction, and rate of change of drive parameters, enabling the driver 210 to dynamically adjust the output drive parameters based on the drive signal.

[0092] The driver 210 applies corresponding driving parameters to the electrochromic device to charge or discharge the electrochromic device, thereby enabling the electrochromic film to achieve the corresponding color-changing effect (such as coloring or fading) during the charging or discharging process.

[0093] To ensure that the membrane voltage of the electrochromic device remains within a safe voltage range during charging and discharging, the processor 230 introduces a negative feedback control mechanism during charging or discharging. The sampler 220 monitors the changes in membrane voltage at various test points of the electrochromic device in real time during charging or discharging, and then adjusts the driving parameters applied to the electrochromic device by the driver 210 accordingly based on the changes in membrane voltage. By monitoring the membrane voltage of the electrochromic device during charging and discharging to dynamically adjust the driving parameters, continuous monitoring and adjustment can be achieved, forming a negative feedback mechanism. If the membrane voltage at any test point is outside the safe voltage range, the driving parameters will be adjusted immediately, thereby dynamically responding to and adjusting the color change of the electrochromic device. This ensures that the electrochromic device is always in its optimal working state during charging and discharging. In other words, while increasing the charging voltage and decreasing the discharging voltage to increase the color change rate, it also avoids overvoltage or over-discharge of the electrochromic device, thus improving its stability. This solves the problems of easy aging and short service life of the device due to long-term charging or discharging in the existing technology, and the problem of unstable device performance due to voltage changes caused by the lack of real-time monitoring of voltage changes on the electrochromic device. It has the advantage of improving the stability and reliability of electrochromic devices.

[0094] It is understood that when the processor 230 detects through the sampler 220 that the membrane voltage of the electrochromic device exceeds the safe voltage range during charging, or falls below the safe voltage range during discharging, the processor 230 will instruct the driver 210 to immediately change the driving parameters applied to the electrochromic device to ensure that the electrochromic membrane always operates within a safe and efficient voltage range during the color-changing process. These driving parameters include the magnitude, direction, and rate of change of the driving parameters. Specifically, the driving parameters can be current or voltage. The driver 210 can change the voltage or current applied to the electrochromic device by varying the amplitude, so that the membrane voltage of the electrochromic device remains within a safe range during the driving parameter adjustment process.

[0095] In addition, if the membrane voltage at each test point is within the safe voltage range, the driving parameters can also be adjusted. For example, the driving voltage can be increased during charging and decreased during discharging. Electrochromic devices can be charged faster under a larger driving voltage and discharged faster under a smaller driving voltage.

[0096] During the charging and discharging process of the electrochromic device, the processor 230 can calculate the control parameters corresponding to the current stage based on the membrane voltage monitored by the sampler 220 and the driving parameters applied by the driver 210, and adjust the driving parameters according to the control parameters, which include the direction of change and the step size.

[0097] Furthermore, the processor 230 can also obtain the membrane voltage at each test point after each adjustment of the drive parameters through the sampler 220, in order to determine whether the drive parameters need to be adjusted again.

[0098] In some examples, the processor 230 can also set various control strategies for driving parameters to adapt to different membrane voltage changes during the charging and discharging process of the electrochromic device; wherein, each membrane voltage range and protection condition corresponds to a control strategy. That is, when the processor 230 detects that the current membrane voltage of the electrochromic device is in a certain voltage range, it instructs the driver 210 to continue to maintain the current driving parameters or to change the driving parameters applied to the electrochromic device at a corresponding rate or step size to ensure that the membrane voltage of the electrochromic device is within a safe voltage range.

[0099] The following examples illustrate the principles of different voltage regulation processes during charging and discharging.

[0100] For reference, if the driving voltage is adjusted only when the diaphragm voltage equals the upper or lower limit of the safe voltage range, the diaphragm voltage is prone to exceed the upper limit or fall below the lower limit due to the inherent lag in adjustment. Therefore, to allow for reaction time, a protection voltage is first set based on the material characteristics of the electrochromic device, its application scenario, and the response speed during the adjustment process. This protection voltage serves as the criterion for determining whether and how to adjust the driving voltage. The value of this protection voltage can be determined based on the upper and lower limits of the safe voltage range. Specifically, the protection voltage during charging of the electrochromic device (denoted as the first protection voltage) should not exceed the upper limit of the safe voltage range, and the protection voltage during discharging of the electrochromic device (denoted as the second protection voltage) should not be less than the lower limit of the safe voltage range.

[0101] The following sections explain the control of the charging and discharging processes of electrochromic devices:

[0102] In some examples, when charging an electrochromic device, the driver 210 first applies a large positive driving voltage to the electrochromic device in the initial stage, so that the electrochromic device quickly reaches a target state in the initial stage, thereby accelerating the color-changing speed of the electrochromic device. The initial value of the driving voltage is greater than the upper limit of the safe voltage range.

[0103] During this process, the sampler 220 acquires the membrane voltage at each test point on the electrochromic device in real time, and adjusts the rate or step size of the driving voltage change according to the change of the membrane voltage in different ways, including maintaining, increasing or decreasing the driving voltage.

[0104] Specifically, it is determined whether the diaphragm voltage at any test point is greater than a preset first protection voltage. If the diaphragm voltage at at least one test point is greater than the first protection voltage, then the driving voltage is regulated in a first manner; otherwise, the driving voltage is regulated in a second manner. The first manner differs from the second manner; the first manner includes reducing the driving voltage, while the second manner includes maintaining or increasing the driving voltage.

[0105] It is understandable that if the membrane voltage at any point during the charging process of the electrochromic device exceeds the first protection voltage, meaning the membrane voltage approaches the upper limit of the safe voltage range, it indicates that the driving voltage applied by the current driver 210 to the electrochromic device is about to exceed a maximum voltage that the electrochromic device can withstand. Therefore, it is necessary to reduce the driving voltage to decrease the driving voltage applied by the driver 210 to the electrochromic device, thereby reducing the membrane voltage and preventing damage to the electrochromic device due to excessive membrane voltage. The rate or step size of reducing the driving voltage can be set according to actual needs.

[0106] If the diaphragm voltage of the electrochromic device at any point during charging is less than or equal to the first protection voltage, even though the driving voltage applied by the current driver 210 to the electrochromic device is less than the maximum voltage that the electrochromic device can withstand, meaning the electrochromic device will not face overvoltage risk, the current driving voltage can be maintained or increased to bring the diaphragm voltage of the electrochromic device closer to the upper limit of the safe voltage range, thereby accelerating the color-changing speed of the electrochromic device. Specifically, if the current driving voltage is a large driving voltage, it can be maintained. If the current driving voltage is small, it can be appropriately increased.

[0107] In some optional implementations, in order to improve the color-changing speed of the electrochromic device during the color-changing process and the accuracy of the driving voltage regulation, in the scenario where the diaphragm voltage at any position of the electrochromic device during the charging process is not greater than the first protection voltage, the corresponding regulation method can be selected to regulate the driving voltage based on the rate of change and duration of change of the diaphragm voltage.

[0108] For example, a first target condition is preset, and it is determined whether the diaphragm voltage at any test point meets the first target condition, so as to adjust the driving voltage according to the determination result. Specifically, the first target condition includes the duration for which the voltage change rate of the electrochromic device's diaphragm voltage within a first target time period is greater than a preset first change rate, which is greater than a preset first duration. When the first target condition is met, the driving voltage is adjusted in a second manner. In one embodiment, the first target condition also includes the electrochromic device's diaphragm voltage being less than a target voltage. The target voltage is less than a first protection voltage.

[0109] As an alternative implementation, if the second method is used to regulate the driving voltage, it can be further determined whether to maintain the current driving voltage or increase the driving voltage at the next moment based on the current driving voltage value.

[0110] In this process, the processor 230 determines whether the current driving voltage applied by the driver 210 is greater than a first preset voltage. If the current driving voltage is greater than the first preset voltage, the processor 230 determines that the driver 210 maintains the current driving voltage. Since the current driving voltage is large and increasing at a large rate, maintaining the current driving voltage can achieve a larger color-changing rate and reduce the risk of overcharging. Conversely, if the current driving voltage is smaller than the first preset voltage, the processor 230 determines that the driver 210 should increase the voltage based on the current driving voltage by a step length, so that the driver 210 provides the electrochromic device with the increased driving voltage. Since the current driving voltage is small, directly increasing the driving voltage by a step length can accelerate the color-changing rate of the electrochromic device.

[0111] The values ​​of the first preset voltage and the first step length can be set according to actual needs, and this embodiment is not limited in this regard. For example, the first preset voltage is greater than the upper limit of the safe voltage range and less than the initial driving voltage.

[0112] In some examples, it may be a further improvement based on any of the above embodiments, where the ratio of the first preset voltage to the upper limit of the safe voltage range is 4-6.

[0113] As an optional implementation, the ratio of the initial driving voltage to the upper limit of the safe voltage range is greater than or equal to 7. Wherein, the initial driving voltage is greater than the first preset voltage and the upper limit of the safe voltage range; a larger initial driving voltage can accelerate the color-changing rate of the electrochromic device.

[0114] As an optional implementation, this embodiment can further determine the driving voltage at the next moment based on the current driving voltage value when the membrane voltage at any point during the charging process of the electrochromic device is greater than the first protection voltage. In this embodiment, the driving voltage can be divided into different voltage ranges, each corresponding to a different adjustment step size. The voltage range and adjustment step size can be set according to actual needs, and this embodiment is not limited thereto.

[0115] For example, if the current driving voltage is greater than the second preset voltage, it is determined that when adjusting the driving voltage in the first manner, the driving voltage is reduced by a second step size; if the current driving voltage is less than or equal to the second preset voltage and greater than the third preset voltage, the first manner is to reduce the driving voltage by a third step size; if the current driving voltage is less than or equal to the third preset voltage and greater than the fourth preset voltage, the first manner is to reduce the driving voltage by a fourth step size.

[0116] In some examples, it may be a further improvement based on any of the above embodiments, wherein the second preset voltage, the third preset voltage and the fourth preset voltage decrease sequentially; and the second step size, the third step size and the fourth step size decrease sequentially.

[0117] In some examples, it may be a further improvement based on any of the above embodiments, where the ratio of the second preset voltage to the third preset voltage is 1.5-2.5; the ratio of the third preset voltage to the fourth preset voltage is 1.5-2.5; the ratio of the second step size to the third step size is 4-6; and the ratio of the third step size to the fourth step size is 2-3.

[0118] Similar to the charging process, if the electrochromic device is discharged, the driver 210 first applies a large reverse driving voltage to the electrochromic device in the initial stage, so that the electrochromic device quickly reaches a target state in the initial stage to quickly respond to the discharge signal. The initial value of the driving voltage is less than the lower limit of the safe voltage range.

[0119] During this process, the sampler 220 acquires the membrane voltage at each test point on the electrochromic membrane in real time, and adjusts the rate or step size of the driving voltage change according to the change of the membrane voltage in different ways, including maintaining, increasing or decreasing the driving voltage.

[0120] Furthermore, it is determined whether the diaphragm voltage at any test point is less than the preset second protection voltage; if the diaphragm voltage at at least one test point is less than the second protection voltage, it is determined that the driving voltage is regulated in a third manner; otherwise, it is determined that the driving voltage is regulated in a fourth manner.

[0121] It is understandable that, since the driving voltage applied by the driver 210 during the discharge process is a reverse voltage, if the diaphragm voltage at any point in the electrochromic device during the discharge process is less than the second protection voltage, that is, if the diaphragm voltage approaches the lower limit of the safe voltage range, it means that the driving voltage applied by the driver 210 to the electrochromic device is about to be less than a minimum voltage that the electrochromic device can withstand. Therefore, it is necessary to increase the driving voltage (i.e., decrease the absolute value of the driving voltage) to increase the driving voltage applied by the driver 210 to the electrochromic device, thereby increasing the diaphragm voltage on the electrochromic device and preventing damage to the electrochromic device due to an excessively low diaphragm voltage. The rate or step size of the reverse reduction of the driving voltage can be set according to actual needs.

[0122] If the diaphragm voltage at any point during the discharge process of the electrochromic device is greater than or equal to the second protection voltage, it indicates that the driving voltage applied by the current driver 210 to the electrochromic device is greater than the minimum voltage that the electrochromic device can withstand. In other words, the electrochromic device will not face overvoltage risk at this time. Therefore, the current driving voltage can be maintained or reduced to bring the diaphragm voltage of the electrochromic device closer to the lower limit of the safe voltage range, thereby accelerating the color-changing rate of the electrochromic device. Specifically, if the current driving voltage is relatively large, it can be appropriately reduced. If the current driving voltage is relatively small, it can be maintained.

[0123] In some optional implementations, in order to improve the color-changing rate of the electrochromic device during the color-changing process and the accuracy of the driving voltage regulation, in the scenario where the diaphragm voltage at any position of the electrochromic device during the charging process is not less than the second protection voltage, the appropriate regulation method can be selected to regulate the driving voltage based on the rate of change and duration of change of the diaphragm voltage.

[0124] For example, in this embodiment, a second target condition is preset, and it is determined whether the membrane voltage at any test point meets the second target condition. Based on the determination result, an appropriate control method is selected to control the driving voltage. Specifically, if it is determined that the duration of the state in which the voltage change rate of the electrochromic device's membrane voltage is less than the preset second change rate during the second target time period is greater than the preset second duration, then the fourth method is used to control the driving voltage.

[0125] As an alternative implementation, if the second method is used to regulate the driving voltage, it can be further determined whether to maintain the current driving voltage or reduce the driving voltage at the next moment based on the current driving voltage value.

[0126] Specifically, the processor 230 determines whether the current driving voltage applied by the driver 210 is less than a fifth preset voltage. If the current driving voltage is less than the fifth preset voltage, the second approach is to maintain the current driving voltage; otherwise, it determines that the driver 210 should reduce the driving voltage based on the current driving voltage. During this process, the processor 230 can reduce the driving voltage according to a fifth step size based on the current driving voltage, so that the driver 210 provides the reduced driving voltage to the electrochromic device.

[0127] The values ​​of the fifth preset voltage and the fifth step size can be set according to actual needs, and this embodiment is not limited in this regard. For example, the fifth preset voltage is less than the lower limit of the safe voltage range and greater than the initial driving voltage.

[0128] In some examples, it may be a further improvement based on any of the above embodiments, where the ratio of the fifth preset voltage to the lower limit of the safe voltage range is 7-9.

[0129] As an optional implementation, the ratio of the initial driving voltage to the lower limit of the safe voltage range is greater than or equal to 13. During discharge, a lower initial driving voltage is beneficial for accelerating the discharge color-changing rate of the electrochromic device.

[0130] As an optional implementation, this embodiment can further determine the driving voltage at the next moment based on the current driving voltage value when the diaphragm voltage at any position during the discharge process of the electrochromic device is less than the second protection voltage. In this embodiment, the driving voltage can be divided into different voltage ranges, each corresponding to a different adjustment step size. The voltage range and adjustment step size can be set according to actual needs, and this embodiment is not limited thereto.

[0131] For example, if the current driving voltage is less than the sixth preset voltage, when it is determined to adjust the driving voltage in the third manner, the driving voltage is increased by the sixth step; if the current driving voltage is greater than or equal to the sixth preset voltage and less than the seventh preset voltage, the third manner is to increase the driving voltage by the seventh step; if the current driving voltage is greater than or equal to the seventh preset voltage and less than the eighth preset voltage, the third manner is to increase the driving voltage by the eighth step.

[0132] In some examples, it may be a further improvement based on any of the above embodiments, where the sixth preset voltage, the seventh preset voltage and the eighth preset voltage increase sequentially, and the sixth step size, the seventh step size and the eighth step size decrease sequentially.

[0133] In some examples, it may be a further improvement based on any of the above embodiments, where the ratio of the sixth preset voltage to the seventh preset voltage is 1.5-2.5; the ratio of the seventh preset voltage to the eighth preset voltage is 1.5-2.5; the ratio of the sixth step size to the seventh step size is 4-6; and the ratio of the seventh step size to the eighth step size is 2-3.

[0134] It is understandable that at the beginning of the charging process, a larger initial driving voltage is applied to the electrochromic device, or at the beginning of the discharging process, a smaller initial driving voltage is applied. This increases the charging or discharging speed of the electrochromic device, accelerating the color-changing speed and thus improving the user experience. As charging or discharging progresses, the driving voltage is adjusted in different ways according to the changes in the diaphragm voltage, such as maintaining, increasing, or decreasing the driving voltage. This ensures that the electrochromic device maintains a larger diaphragm voltage during charging and a smaller diaphragm voltage during discharging, avoiding overvoltage or undervoltage during charging and discharging. This improves the color-changing rate of the electrochromic device and reduces the risk of damage.

[0135] The following is combined Figure 3 , Figure 4 , Figure 5 The document also provides specific examples to illustrate different charging and discharging scenarios. It assumes that the upper limit of the safe voltage range is 1.3V, the lower limit is -0.6V, the first protection voltage is 1.28V, and the second protection voltage is -0.58V.

[0136] During charging, the driver 210 applies a positive voltage to the electrochromic device, as in one embodiment, such as Figure 4 As shown, the initial drive voltage can be 10V.

[0137] If the current membrane voltage is detected to be lower than the target voltage (which can be 1.2V), and the voltage change rate is greater than 0.1V / s and maintained for more than 3 seconds (the first target condition), then the driving voltage is adjusted according to the current driving voltage using a corresponding control method. In one embodiment, the first preset voltage can be 7V. If the current driving voltage is greater than 7V, the current driving voltage is maintained unchanged; if the current driving voltage is less than 7V, the driving voltage is gradually increased by a step length (which can be 0.3V) to accelerate the color change speed, i.e., the driving voltage increases by 0.3V within 100 milliseconds to 10 seconds; and when the membrane voltage is detected to exceed 1.2V, the voltage before the increase in driving voltage is restored to protect the device.

[0138] If the current drive voltage is detected to be greater than or equal to 1.28V, the current drive voltage is reduced to prevent overvoltage. During this process, the step size for reducing the drive voltage can be determined based on the current drive voltage. Specifically, if the current drive voltage is greater than 5V (i.e., the second preset voltage), the drive voltage is reduced in steps of 2.5V (the second step size); if the current drive voltage is less than or equal to 5V (the second preset voltage) but greater than 2.5V (the third preset voltage), the voltage is reduced in steps of 0.5V (the third step size); if the current drive voltage is less than or equal to 2.5V (the third preset voltage) but greater than 1.4V (the fourth preset voltage), the voltage is reduced in steps of 0.2V (the fourth step size).

[0139] During the discharge process, the driver 210 applies a reverse voltage to the electrochromic device, as in one embodiment, such as Figure 5 As shown, the initial drive voltage can be -10V or -8V.

[0140] If the diaphragm voltage is detected to be greater than or equal to the second protection voltage (-0.6V), and the second target condition is met (i.e., the voltage change rate is less than -0.1V / s and this state is maintained for more than 3 seconds), then the driving voltage is adjusted according to the current driving voltage using an appropriate control method. Specifically, if the current driving voltage is less than -5V (the fifth preset voltage), the current driving voltage is maintained unchanged; if the current driving voltage is greater than or equal to -5V, the current driving voltage is gradually reduced in 0.2V steps (the fifth step) to accelerate the color change. When the diaphragm voltage is detected to be less than -0.5V, the voltage is restored to the level before the current driving voltage was reduced to protect the device.

[0141] If the detected diaphragm voltage is less than -0.58V (second protection voltage), the current driving voltage is increased to prevent undervoltage (over-discharge). During this process, the step size for decreasing the driving voltage can be increased or decreased based on the current driving voltage. Specifically, if the current driving voltage is less than -4V (sixth preset voltage), the voltage is increased in steps of 2V (sixth step); if the current driving voltage is greater than or equal to -4V (sixth preset voltage) and less than -1.5V (seventh preset voltage), the voltage is increased in steps of 0.5V (seventh step); if the current driving voltage is greater than or equal to -1.5V (seventh preset voltage) and less than -0.8V (eighth preset voltage), the voltage is increased in steps of 0.2V (eighth step).

[0142] It is understood that this embodiment monitors the changes in the membrane voltage of the electrochromic device during charging and discharging in real time, and then dynamically adjusts the driving voltage applied to the electrochromic device to ensure that the membrane voltage is always within a safe voltage range. This solves the problem in the prior art where, due to environmental changes or membrane aging, the externally applied driving voltage may exceed the safe range, causing device damage. This effectively extends the device's service life and ensures stable operation in various environments. In addition, this embodiment can also improve the color-changing speed of the electrochromic device by dynamically adjusting the driving voltage while ensuring device safety.

[0143] This application also provides a voltage control system for an electrochromic device, exemplary, such as... Figure 5 As shown, the voltage control system includes a terminal platform 300 and the aforementioned voltage control device 200. The terminal platform 300 can interact with the processor 230 or receiver in the voltage control device 200. For example, the terminal platform 300 can send a charging signal or a discharging signal, and the processor 230 or receiver can receive the charging signal or discharging signal to trigger the driver 210 to apply a driving voltage to the electrochromic device.

[0144] In another embodiment, the terminal platform 300 can also interact with the transmitter in the voltage control device 200. For example, the transmitter can send a charging completion signal or a discharging completion signal, and the terminal platform 300 can receive these signals. Thus, through the information interaction between the terminal platform 300 and the voltage control device 200, the terminal platform 300 can control the electrochromic device, etc., via the voltage control device 200.

[0145] The above text combines Figures 1a to 6 This application provides a detailed description of the voltage control device 200 and system for an electrochromic device according to embodiments of the present application. The following is in conjunction with… Figure 7This application provides a detailed description of the voltage control method for the electrochromic device provided in the embodiments. Figure 7 The corresponding method shown can be used in, for example... Figure 2 The voltage control device 200 shown is used for execution. It should be understood that the description of the voltage control method embodiment for the electrochromic device corresponds to the description of the device embodiment. Therefore, for any content not described in detail, please refer to the device embodiment above. For the sake of brevity, it will not be repeated here.

[0146] like Figure 7 As shown in the illustration, this application provides a voltage control method for an electrochromic device. In fact, this method may include the following steps:

[0147] S710 applies a driving voltage to the electrochromic device.

[0148] S720 acquires the membrane voltage at each test point on the electrochromic device.

[0149] S730 adjusts the driving voltage according to the diaphragm voltage to keep the diaphragm voltage within a preset safe voltage range. The driving voltage includes a forward voltage or a reverse voltage. If the driving voltage is a forward voltage, the initial value of the forward voltage is greater than the upper limit of the safe voltage range. If the driving voltage is a reverse voltage, the initial value of the reverse voltage is less than the lower limit of the safe voltage range.

[0150] In one embodiment, step S730, which adjusts the driving voltage based on the diaphragm voltage, includes: determining a voltage adjustment parameter based on the diaphragm voltage and the driving voltage, and adjusting the driving voltage based on the voltage adjustment parameter, wherein the voltage adjustment parameter includes a direction of change and a step size.

[0151] In one embodiment, if the driving voltage is a positive voltage, adjusting the driving voltage according to the diaphragm voltage includes: determining whether the diaphragm voltage at any of the test points is greater than a preset first protection voltage; if yes, determining to adjust the driving voltage in a first manner; if no, determining to adjust the driving voltage in a second manner; wherein the second manner differs from the first manner, the second manner includes maintaining or increasing the driving voltage, and the first manner includes decreasing the driving voltage. The first protection voltage is not greater than the upper limit of the safe voltage range.

[0152] In one embodiment, if the diaphragm voltage is not greater than the first protection voltage, then determining to regulate the driving voltage in a second manner further includes: determining whether a preset first target condition is met; if so, determining the second manner based on the current driving voltage; the first target condition includes the duration of the state in which the voltage change rate of the diaphragm voltage is greater than a preset first change rate within a first target time period being greater than a preset first duration.

[0153] In one embodiment, determining the second method based on the current driving voltage includes: determining whether the current driving voltage is greater than a first preset voltage; if so, the second method is to maintain the current driving voltage; if not, the second method is to increase the driving voltage according to the first step length, wherein the first preset voltage is greater than the upper limit of the safe voltage range and less than the initial driving voltage.

[0154] In one embodiment, if the diaphragm voltage is greater than the first protection voltage, then determining to regulate the driving voltage in a first manner further includes:

[0155] In one embodiment, if the current driving voltage is greater than the second preset voltage, the first method is to reduce the driving voltage according to the second step size;

[0156] If the current driving voltage is less than or equal to the second preset voltage and greater than the third preset voltage, then the first method is to reduce the driving voltage according to the third step size;

[0157] If the current driving voltage is less than or equal to the third preset voltage and greater than the fourth preset voltage, then the first method is to reduce the driving voltage according to the fourth step size;

[0158] The second preset voltage, the third preset voltage, and the fourth preset voltage decrease sequentially, as do the second step size, the third step size, and the fourth step size.

[0159] In one embodiment, if the driving voltage is a reverse voltage, adjusting the driving voltage according to the diaphragm voltage includes: determining whether the diaphragm voltage at any of the test points is less than a preset second protection voltage;

[0160] If so, then it is determined that the driving voltage is regulated in a third manner;

[0161] If not, then the driving voltage is determined to be regulated in a fourth manner;

[0162] Wherein, the second protection voltage is not less than the lower limit of the safe voltage range; the fourth method is different from the third method, the fourth method includes maintaining or reducing the driving voltage, and the third method includes increasing the driving voltage.

[0163] In one embodiment, if the diaphragm voltage is not less than the second protection voltage, then determining to regulate the driving voltage in a fourth manner further includes: determining whether a preset second target condition is met; if so, determining the fourth manner based on the current driving voltage; the second target condition includes the duration of the state in which the voltage change rate of the diaphragm voltage is less than a preset second change rate within a second target time period being greater than a preset second duration.

[0164] In one embodiment, determining the fourth mode based on the current driving voltage includes: determining whether the current driving voltage is less than a fifth preset voltage; if so, the fourth mode is to maintain the current driving voltage; if not, the fourth mode is to reduce the driving voltage according to a fifth step size, wherein the fifth preset voltage is less than the lower limit of the safe voltage range and greater than the initial driving voltage.

[0165] In one embodiment, if the diaphragm voltage is less than the second protection voltage, then determining to regulate the driving voltage in a third manner further includes:

[0166] If the current driving voltage is less than the sixth preset voltage, then the third method is to increase the driving voltage by the sixth step.

[0167] If the current driving voltage is greater than or equal to the sixth preset voltage and less than the seventh preset voltage, then the third method is to increase the driving voltage according to the seventh step size;

[0168] If the current driving voltage is greater than or equal to the seventh preset voltage and less than the eighth preset voltage, then the third method is to increase the driving voltage according to the eighth step size;

[0169] Among them, the sixth preset voltage, the seventh preset voltage and the eighth preset voltage increase sequentially, and the sixth step length, the seventh step length and the eighth step length decrease sequentially.

[0170] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that, in alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0171] In addition, the functional modules or units in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0172] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a smartphone, personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0173] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A method of voltage control of an electrochromic device, characterized in that, include: A driving voltage is applied to the electrochromic device; Obtain the membrane voltage at each test point on the electrochromic device; The driving voltage is adjusted according to the diaphragm voltage to keep the diaphragm voltage within a preset safe voltage range. The driving voltage includes a forward voltage or a reverse voltage. If the driving voltage is a forward voltage, the initial value of the forward voltage is greater than the upper limit of the safe voltage range. If the driving voltage is a reverse voltage, the initial value of the reverse voltage is less than the lower limit of the safe voltage range.

2. The voltage control method of an electrochromic device according to claim 1, characterized in that, The step of adjusting the driving voltage according to the diaphragm voltage includes: The voltage control parameters are determined based on the diaphragm voltage and the driving voltage, and the driving voltage is controlled based on the voltage control parameters, wherein the voltage control parameters include the direction of change and the step size.

3. The voltage control method of an electrochromic device according to claim 1 or 2, characterized in that, If the driving voltage is a positive voltage, adjusting the driving voltage according to the diaphragm voltage includes: Determine whether the diaphragm voltage at any of the test points is greater than a preset first protection voltage; wherein the first protection voltage is not greater than the upper limit of the safe voltage range; If so, then it is determined that the driving voltage is regulated in a first manner; If not, then the driving voltage is determined to be regulated in a second manner; The second method differs from the first method in that the second method includes maintaining or increasing the driving voltage, while the first method includes decreasing the driving voltage.

4. The voltage control method of an electrochromic device according to claim 3, characterized in that, If the diaphragm voltage is not greater than the first protection voltage, then determining to regulate the driving voltage in a second manner further includes: Determine whether the preset first target condition is met. If it is met, determine the second mode based on the current driving voltage. The first target condition includes the duration of the state in which the voltage change rate of the diaphragm voltage is greater than the preset first change rate within the first target time period being greater than the preset first duration.

5. The method of claim 4, wherein the voltage is applied to the electrochromic device in a stepwise manner. The method of determining the second method based on the current driving voltage includes: Determine whether the current driving voltage is greater than the first preset voltage. If yes, the second method is to maintain the current driving voltage. If no, the second method is to increase the driving voltage according to the first step length. The first preset voltage is greater than the upper limit of the safe voltage range and less than the initial driving voltage.

6. The voltage control method of an electrochromic device according to claim 5, characterized in that, The ratio of the first preset voltage to the upper limit of the safe voltage range is 4-6; The ratio of the initial driving voltage to the upper limit of the safe voltage range is greater than or equal to 7.

7. The voltage control method of the electrochromic device according to claim 3, wherein If the diaphragm voltage is greater than the first protection voltage, then determining to regulate the driving voltage in a first manner further includes: If the current driving voltage is greater than the second preset voltage, then the first method is to reduce the driving voltage according to the second step size; If the current driving voltage is less than or equal to the second preset voltage and greater than the third preset voltage, then the first method is to reduce the driving voltage according to the third step size; If the current driving voltage is less than or equal to the third preset voltage and greater than the fourth preset voltage, then the first method is to reduce the driving voltage according to the fourth step size; The second preset voltage, the third preset voltage, and the fourth preset voltage decrease sequentially, as do the second step size, the third step size, and the fourth step size.

8. The voltage control method for the electrochromic device according to claim 7, characterized in that, The ratio of the second preset voltage to the third preset voltage is 1.5-2.5; The ratio of the third preset voltage to the fourth preset voltage is 1.5-2.5; The ratio of the second step length to the third step length is 4-6; The ratio of the third step length to the fourth step length is 2-3.

9. The voltage control method for the electrochromic device according to claim 1 or 2, characterized in that, If the driving voltage is a reverse voltage, adjusting the driving voltage according to the diaphragm voltage includes: Determine whether the diaphragm voltage at any of the test points is less than a preset second protection voltage; wherein the second protection voltage is not less than the lower limit of the safe voltage range; If so, then it is determined that the driving voltage is regulated in a third manner; If not, then the driving voltage is determined to be regulated in a fourth manner; The fourth method differs from the third method in that it includes maintaining or reducing the driving voltage, while the third method includes increasing the driving voltage.

10. The voltage control method for the electrochromic device according to claim 9, characterized in that, If the diaphragm voltage is not less than the second protection voltage, then determining that the driving voltage is regulated in a fourth manner further includes: Determine whether the preset second target condition is met. If it is met, determine the fourth mode based on the current driving voltage. The second target condition includes the duration of the state in which the voltage change rate of the diaphragm voltage is less than the preset second change rate during the second target time period being greater than the preset second duration.

11. The voltage control method for the electrochromic device according to claim 10, characterized in that, The determination of the fourth method based on the current driving voltage includes: Determine whether the current driving voltage is less than a fifth preset voltage. If yes, the fourth method is to maintain the current driving voltage. If no, the fourth method is to reduce the driving voltage according to a fifth step size. The fifth preset voltage is less than the lower limit of the safe voltage range and greater than the initial driving voltage.

12. The voltage control method for the electrochromic device according to claim 11, characterized in that, The ratio of the fifth preset voltage to the lower limit of the safe voltage range is 7-9; The ratio of the initial driving voltage to the lower limit of the safe voltage range is greater than or equal to 13.

13. The voltage control method for the electrochromic device according to claim 9, characterized in that, If the diaphragm voltage is less than the second protection voltage, then determining to regulate the driving voltage in a third manner further includes: If the current driving voltage is less than the sixth preset voltage, then the third method is to increase the driving voltage by the sixth step. If the current driving voltage is greater than or equal to the sixth preset voltage and less than the seventh preset voltage, then the third method is to increase the driving voltage according to the seventh step size; If the current driving voltage is greater than or equal to the seventh preset voltage and less than the eighth preset voltage, then the third method is to increase the driving voltage according to the eighth step size; Among them, the sixth preset voltage, the seventh preset voltage and the eighth preset voltage increase sequentially, and the sixth step length, the seventh step length and the eighth step length decrease sequentially.

14. The voltage control method for the electrochromic device according to claim 13, characterized in that, The ratio of the sixth preset voltage to the seventh preset voltage is 1.5-3; The ratio of the seventh preset voltage to the eighth preset voltage is 1-2.5; The ratio of the sixth step length to the seventh step length is 3-5; The ratio of the seventh step length to the eighth step length is 2-3.

15. A voltage control device for an electrochromic device, characterized in that, include: A driver is used to apply a driving voltage to an electrochromic device; A sampler is used to acquire the membrane voltage at each test point on the electrochromic device; The processor is configured to adjust the driving voltage according to the diaphragm voltage so that the diaphragm voltage is within a preset safe voltage range; The driver is also used to apply the regulated driving voltage to the electrochromic device, wherein the driving voltage includes a forward voltage or a reverse voltage. If the driving voltage is a forward voltage, the initial value of the forward voltage is greater than the upper limit of the safe voltage range; if the driving voltage is a reverse voltage, the initial value of the reverse voltage is less than the lower limit of the safe voltage range.

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