Power supply control method and control apparatus for electrochromic device

Abstract

The present application provides a power supply control method and control apparatus for an electrochromic device. The power supply control method comprises: when power is on, providing a first driving voltage to an electrochromic device, such that a divided voltage of the electrochromic device reaches a maximum withstand voltage range; collecting a driving current value transmitted to the electrochromic device; and adjusting the first driving voltage to a second driving voltage on the basis of the driving current value, such that the divided voltage of the electrochromic device maintains the maximum withstand voltage range. By providing a large first driving voltage to the electrochromic device, and adjusting the driving voltage to the second driving voltage on the basis of the collected driving current value, the divided voltage of the electrochromic device can be controlled, so that the divided voltage of the electrochromic device maintains the maximum withstand voltage range, thereby achieving rapid color change of the electrochromic device.

Description

Power supply control method and control device for electrochromic devices

[0001] This application claims priority to Chinese Patent Application No. 202411822963.X, filed on December 11, 2024, entitled "Power Supply Control Method and Control Device for Electrochromic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of electrochromic technology, and particularly relates to a power supply control method and control device for an electrochromic device. Background Technology

[0003] With technological advancements, the demand for light and heat regulation is increasing, leading to greater attention being paid to electrochromic technology. Specifically, electrochromic technology refers to the technique where the optical properties of electrochromic materials change under the influence of an applied electric field, external light intensity, and other external factors. Typically, this results in electrochromic devices containing the material exhibiting reversible changes in color and transparency. In recent years, electrochromic devices have been widely used in energy-saving windows, automotive rearview mirrors, display devices, and mobile terminals, demonstrating promising market prospects.

[0004] However, current electrochromic devices suffer from slow color-changing rates and poor long-term stability. Summary of the Invention

[0005] The purpose of this application is to provide a power supply control method and control device for electrochromic devices, which aims to solve the problems of slow color-changing rate and poor long-term stability of traditional electrochromic devices.

[0006] A first aspect of this application provides a power supply control method for an electrochromic device, comprising: providing a first driving voltage to the electrochromic device when energized, so that the voltage division on the electrochromic device reaches the maximum withstand voltage range; acquiring a driving current value transmitted to the electrochromic device; and adjusting the first driving voltage to a second driving voltage according to the driving current value, so that the voltage division on the electrochromic device maintains the maximum withstand voltage range.

[0007] The first driving voltage is the initial driving voltage provided to the electrochromic device, and the second driving voltage is the real-time driving voltage adjusted according to the driving current value during power supply. The voltage drop across the electrochromic device is the actual voltage it withstands. Due to factors such as line resistance, the voltage drop caused by the wires after the first driving voltage is transmitted to the electrochromic device will affect the actual voltage it withstands; that is, the voltage drop across the electrochromic device will be less than the first driving voltage provided.

[0008] In this application, a relatively large first driving voltage is first provided to the electrochromic device, enabling it to change color with a voltage division within its maximum withstand voltage range, thereby increasing the color-changing rate. Furthermore, during the color-changing process, the driving current of the electrochromic device is detected, and the driving voltage supplied to it is adjusted in a timely manner based on changes in the driving current value. Specifically, the first driving voltage is adjusted to a second driving voltage, ensuring that the voltage division on the electrochromic device remains within its maximum withstand voltage range. This maintains a relatively large voltage division throughout the color-changing process, further enhancing the color-changing rate of the electrochromic device.

[0009] In addition, by monitoring the driving current, this application can improve the color-changing speed while ensuring that the voltage drop of the electrochromic device does not exceed the maximum withstand voltage range, thereby reducing damage to the electrochromic device, effectively protecting the electrochromic device, and improving the color-changing reliability and long-term stability of the electrochromic device.

[0010] In one embodiment, the upper limit of the maximum withstand voltage range is: V device +0.1V, the lower limit of the maximum withstand voltage range is: V device -0.1V, where V device This is the maximum withstand voltage of the electrochromic device.

[0011] In one embodiment, the method for determining the maximum withstand voltage includes: performing a cycle life test on the electrochromic device under the maximum withstand voltage, such that the number of cycles of the electrochromic device is greater than a preset number of cycles.

[0012] In one embodiment, the first driving voltage is determined based on an initial set current value and the maximum withstand voltage of the electrochromic device.

[0013] In one embodiment, the first driving voltage is determined by the following relationship: V total1 =I0×R wire +V device Among them, V total1 The first driving voltage is given, I0 is the initial set current value, and R is the current value. wire V is the line resistance. device This is the maximum withstand voltage of the electrochromic device.

[0014] In one embodiment, the ratio of the first driving voltage to the maximum withstand voltage ranges from 1 to 5. That is, first driving voltage : maximum withstand voltage = (1-5) : 1.

[0015] In one embodiment, the second driving voltage changes in a positive correlation with the driving current value.

[0016] In one embodiment, the second driving voltage is adjusted by the following relationship: V total2 =I1×R wire +V device Among them, V total2 I1 is the second driving voltage, and R is the driving current value. wire V is the line resistance. device This refers to the maximum withstand voltage.

[0017] In one embodiment, the acquisition of the driving current transmitted to the electrochromic device includes: acquiring the driving current value transmitted to the electrochromic device at preset time intervals; or acquiring the driving current value transmitted to the electrochromic device in real time.

[0018] In one embodiment, the driving current value transmitted to the electrochromic device is collected at a preset time interval, and the preset time interval becomes shorter over time; and / or the value of the preset time interval is in the range of 100 milliseconds to 10 seconds.

[0019] In one embodiment, the drive current value is limited according to an initial set current value.

[0020] A second aspect of this application provides a control device for driving an electrochromic device, comprising: a driver for providing a first driving voltage when energized, such that the voltage across the electrochromic device reaches a maximum withstand voltage range; a sampler for acquiring a driving current value transmitted from the driver to the electrochromic device; and a processor for determining a second driving voltage based on the driving current value. The driver is further configured to adjust the first driving voltage to the second driving voltage, such that the voltage across the electrochromic device maintains the maximum withstand voltage range.

[0021] In one embodiment, the first driving voltage is determined based on an initial set current value and the maximum withstand voltage of the electrochromic device.

[0022] In one embodiment, the upper limit of the maximum withstand voltage range is: V device +0.1V, the lower limit of the maximum withstand voltage range is: V device -0.1V, where V device This is the maximum withstand voltage of the electrochromic device.

[0023] In one embodiment, the method for determining the maximum withstand voltage includes: performing a cycle life test on the electrochromic device under the maximum withstand voltage, such that the number of cycles of the electrochromic device is greater than a preset number of cycles.

[0024] In one embodiment, the first driving voltage is determined by the following relationship: V total1 =I0×R wire +V device Among them, V total1 The driving voltage is I0, the initial set current value is R. wire V is the line resistance. device This is the maximum withstand voltage of the electrochromic device.

[0025] In one embodiment, the ratio of the first driving voltage to the maximum withstand voltage ranges from 1 to 5.

[0026] In one embodiment, the second driving voltage changes in a positive correlation with the driving current value.

[0027] In one embodiment, the second driving voltage is adjusted by the following relationship: V total2 =I1×R wire +V device Among them, V total2 I1 is the driving voltage, R is the driving current value, and R is the driving voltage. wire V is the line resistance. device This is the maximum withstand voltage of the electrochromic device.

[0028] In one embodiment, the sampler is specifically used to collect the driving current value transmitted to the electrochromic device at preset time intervals.

[0029] In one embodiment, the sampler is specifically used to collect the driving current value transmitted to the electrochromic device in real time. Attached Figure Description

[0030] Figure 1 is a flowchart of a power supply control method provided in an embodiment of this application;

[0031] Figure 2 is a schematic diagram of the power supply circuit provided in an embodiment of this application;

[0032] Figure 3 is another schematic diagram of the power supply circuit provided in one embodiment of this application. Embodiments of the present invention

[0033] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0034] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0035] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] Figure 1 shows a flowchart of a power supply control method for an electrochromic device according to an embodiment of this application. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0038] A power supply control method for an electrochromic device includes steps S100, S200, and S300, the specific steps of which are shown below:

[0039] Step S100: When energized, a first driving voltage is provided to the electrochromic device so that the voltage drop across the electrochromic device reaches the maximum withstand voltage range.

[0040] Step S200: Collect the driving current value transmitted to the electrochromic device.

[0041] Step S300: Adjust the first driving voltage to the second driving voltage according to the driving current value, so that the voltage division on the electrochromic device is maintained within the maximum withstand voltage range.

[0042] By outputting a first driving voltage when powered on and adjusting a second driving voltage based on the detected driving current value, the voltage division of the electrochromic device can be controlled, so that the voltage division of the electrochromic device is maintained within the maximum withstand voltage range, thus enabling the electrochromic device to change color rapidly.

[0043] It should be noted that the larger the voltage drop across the electrochromic device, the faster the device changes color. In the initial state without power, the impedance of the electrochromic device is low. When power is applied, a first driving voltage is supplied to the electrochromic device, causing the voltage drop across it to reach its maximum withstand voltage range, which allows the electrochromic device to change color rapidly.

[0044] As the electrochromic device is continuously energized, its impedance gradually increases, and the driving current flowing through it also increases or decreases accordingly. The first driving voltage can then be adjusted to the second driving voltage and supplied to the electrochromic device. The second driving voltage will gradually decrease as the driving current decreases.

[0045] The voltage drop across the electrochromic device reaches the maximum withstand voltage range and the voltage drop across the electrochromic device is maintained within the maximum withstand voltage range. Specifically, this can refer to controlling the voltage drop across the electrochromic device to fluctuate within a certain voltage range above and below the maximum withstand voltage.

[0046] In one embodiment, the upper limit of the maximum withstand voltage range is: V device +0.1V, the lower limit of the maximum withstand voltage range is: V device -0.1V, where V device This is the maximum withstand voltage for the electrochromic device. The maximum withstand voltage range is V. device -0.1V to V device +0.1V. In this embodiment, when energized, a relatively large first driving voltage is first provided to the electrochromic device, causing the voltage division of the electrochromic device to change color within a range of 0.1V above and below its maximum withstand voltage, thereby improving the color-changing rate of the electrochromic device. Furthermore, during the color-changing process of the electrochromic device, the driving current value of the electrochromic device is detected, and based on the change in the driving current value, the driving voltage provided to the electrochromic device is adjusted in a timely manner, that is, the first driving voltage is adjusted to a second driving voltage, so that the voltage division on the electrochromic device remains within the maximum withstand voltage range. This ensures that a relatively large voltage division is maintained throughout the color-changing process of the electrochromic device, further improving the color-changing rate of the electrochromic device.

[0047] Furthermore, by monitoring the driving current value, this application not only improves the color-changing speed but also ensures that the voltage drop across the electrochromic device does not exceed the maximum withstand voltage range, i.e., not exceeding V. device +0.1V reduces damage to electrochromic devices, effectively protects them, and improves their color-changing reliability and long-term stability.

[0048] In one embodiment, the method for determining the maximum withstand voltage includes: performing a cycle life test on the electrochromic device under the maximum withstand voltage, such that the number of cycles of the electrochromic device is greater than a preset number of cycles. The preset number of cycles is the number of cycles required by the product.

[0049] In one embodiment, the first driving voltage is determined based on an initial set current value and the maximum withstand voltage of the electrochromic device. Both the maximum withstand voltage and the line resistance are fixed parameters. The maximum withstand voltage is the voltage that ensures the normal operation of the electrochromic device, and it corresponds to the specific model of the electrochromic device. The line resistance corresponds to the impedance of the wires used and other components connected in series in the circuit.

[0050] It is understandable that the actual driving circuit of an electrochromic device typically involves voltage division by the circuit and other components. Given the circuit resistance, the first driving voltage can be determined based on the initial current setting and the maximum withstand voltage of the electrochromic device. The specific parameters of the initial current setting can be set according to actual needs.

[0051] In one implementation, determining the initial current limit value for practical use requires considering both the device's color-changing performance and cycle life. A current test design can be implemented, setting the initial current limit at 1A / 2A... and using this current to calculate the output voltage. By collecting data on the product's cycle life and color-changing time under different logic combinations, a suitable initial current value can be selected.

[0052] In one embodiment, the first driving voltage is determined by the following relationship:

[0053] V total1 =I0×R wire +V device (1)

[0054] In equation (1), V total1 I0 is the first driving voltage, and R is the initial set current. wire V is the line resistance. device This is the maximum withstand voltage for the electrochromic device.

[0055] The line resistance is the sum of the resistances of all lines and components in the power supply circuit of the electrochromic device, excluding the electrochromic device itself. When an initial set current is provided to the electrochromic device, the product of the initial set current and the line resistance is the voltage drop across the line resistance. Adding this voltage to the maximum withstand voltage of the electrochromic device gives the required first driving voltage.

[0056] In one embodiment, the power supply control method further includes: acquiring the current temperature, and determining at least one of an initial set current, line resistance, and maximum withstand voltage based on the current temperature. In this embodiment, the influence of temperature on the initial set current, line resistance, and maximum withstand voltage is considered, making the first driving voltage determined based on the initial set current, line resistance, and maximum withstand voltage more accurate. This more effectively improves the color-changing rate and accuracy of the electrochromic device, enhancing the user experience.

[0057] In one embodiment, the ratio of the first driving voltage to the maximum withstand voltage ranges from 1 to 5. First driving voltage : maximum withstand voltage = (1-5) : 1. Exemplarily, the ratio of the first driving voltage to the maximum withstand voltage can be 1:1, 1.5:1, 2:1, 3:1, 4:1, or 5:1.

[0058] In this embodiment, providing a larger first driving voltage to the electrochromic device is beneficial to accelerating the color-changing rate of the electrochromic device.

[0059] In one embodiment, the second driving voltage changes in a positive correlation with the driving current value.

[0060] It should be noted that, as the impedance of the electrochromic device increases continuously, the driving current decreases continuously when the driving voltage remains constant. At the same time, the voltage drop across the electrochromic device also increases continuously. Therefore, the second driving voltage needs to change in a positive correlation with the driving current to reduce the voltage drop across the electrochromic device, thereby avoiding the driving voltage supplied to the electrochromic device from exceeding the maximum withstand voltage range and reducing the risk of damage to the electrochromic device.

[0061] In one embodiment, the second driving voltage is adjusted by the following relationship:

[0062] V total2 =I1×R wire +V device (2)

[0063] In equation (2), V total2 I1 is the second driving voltage, and R is the driving current value. wire V is the line resistance. device This is the maximum withstand voltage for the electrochromic device.

[0064] When a driving current is supplied to the electrochromic device, the product of the driving current and the line resistance is the voltage drop across the line resistance. Adding this voltage to the maximum withstand voltage of the electrochromic device gives the required second driving voltage.

[0065] In one embodiment, step S200 specifically includes: acquiring the drive current value transmitted to the electrochromic device at preset time intervals. Acquiring the drive current value transmitted to the electrochromic device at preset time intervals can reduce the load on the relevant information processing module.

[0066] In one embodiment, the preset time interval can be an equal time interval, meaning the preset time interval remains constant, and the time intervals for multiple acquisitions are all equal. For example, the preset time interval is 1 second. The driving current value transmitted to the electrochromic device is acquired every 1 second. Specifically, a first driving voltage is provided to the electrochromic device, and after 1 second, the driving current value is acquired, and the driving voltage is adjusted once based on this driving current value. After another 1-second interval, the driving current value is acquired again, and the driving voltage is adjusted again based on the newly acquired driving current value. This process is repeated until the power supply ends.

[0067] In one embodiment, the preset time interval can also be unequal. That is, among the multiple acquisition time intervals, at least two time intervals are not equal. For example, a first driving voltage is provided to the electrochromic device, and a driving current value is acquired after 1 second. The driving voltage is adjusted once based on the driving current value. Then, after an interval of 0.5 seconds, the driving current value is acquired again, and the driving voltage is adjusted again based on the newly acquired driving current value.

[0068] In one embodiment, the preset time interval continuously shortens over time. For example, after providing a first driving voltage to the electrochromic device, driving current values ​​are collected sequentially at intervals of 5 seconds, 4 seconds, 3 seconds, 3 seconds, and 1 second, and the driving voltage is adjusted based on the corresponding driving current values. Alternatively, after providing a first driving voltage to the electrochromic device, driving current values ​​are collected sequentially at intervals of 10 seconds, 9 seconds, 7 seconds, 4 seconds, and 0.5 seconds. In this embodiment, during the initial stage of power supply, the rate of change of current is small. At this time, collecting current at longer intervals ensures that the voltage division of the electrochromic device remains within its maximum withstand voltage range while reducing processing load and saving costs. As time progresses, the rate of change of current increases. Shortening the time interval for current collection allows for more precise adjustment of the voltage division of the electrochromic device to its maximum withstand voltage range. In this embodiment, by setting the preset time interval, precise control of the voltage division of the electrochromic device can be achieved.

[0069] In one embodiment, step S200 specifically includes: real-time acquisition of the driving current value transmitted to the electrochromic device; and real-time adjustment of the driving voltage supplied to the electrochromic device based on the real-time acquired driving current value.

[0070] In this embodiment, the method for acquiring the driving current value can be set according to actual needs. Real-time acquisition of the driving current value transmitted to the electrochromic device can make the change of the final output second driving voltage smoother, which is beneficial to further improve the color-changing rate of the electrochromic device.

[0071] In some embodiments, if the decrease in drive current value exceeds a certain threshold within a preset time interval, the second drive voltage can be reduced by a fixed voltage drop. Specifically, the reduced voltage drop can be from 0.1V to 0.5V.

[0072] For example, if the driving current value drops by more than a certain threshold every 30 seconds, the second driving voltage can be reduced by 0.2V.

[0073] In one embodiment, the preset time interval ranges from 100 milliseconds to 10 seconds. For example, the preset time interval can be 100 milliseconds, 200 milliseconds, 300 milliseconds, 400 milliseconds, 500 milliseconds, 600 milliseconds, 700 milliseconds, 800 milliseconds, 900 milliseconds, 1 second, 2 seconds, 3 seconds, 4 seconds, 5 seconds, 6 seconds, 7 seconds, 8 seconds, 9 seconds, or 10 seconds.

[0074] It is understandable that each time a drive current value is acquired, the second drive voltage can be adjusted based on the acquired drive current value.

[0075] In one embodiment, the power supply control method further includes limiting the drive current value according to an initial set current.

[0076] Since the impedance of the electrochromic device is low in the initial state, limiting the driving current value can prevent the driving current value from being too large, thereby extending the service life of the electrochromic device.

[0077] Figure 2 shows a schematic diagram of the control device provided in an embodiment of this application. For ease of explanation, only the parts relevant to this embodiment are shown, and the details are as follows:

[0078] A control device 10 for driving an electrochromic device 20 includes: a driver 100, a sampler 200, and a processor 300.

[0079] The driver 100 provides a first driving voltage to bring the voltage across the electrochromic device 20 to its maximum withstand voltage range. The sampler 200 acquires the driving current value transmitted from the driver 100 to the electrochromic device 20. The processor 300 determines a second driving voltage based on the driving current value. The driver 100 also adjusts the first driving voltage to the second driving voltage to maintain the voltage across the electrochromic device 20 within its maximum withstand voltage range.

[0080] The control device 10 can be used to execute the power supply control method of any of the above embodiments. The control device 10 has the same beneficial effects as the power supply control method, and will not be described again in this embodiment.

[0081] Specifically, the driver 100 may include a power supply and a voltage regulation circuit. The power supply can be electrically connected to the electrochromic device 20 through the voltage regulation circuit. The processor 300 can control the voltage regulation circuit or directly control the voltage output by the power supply. The sampler 200 may specifically include a current sampling circuit. The processor 300 may specifically include a microprocessor, logic control circuits, and other control modules.

[0082] In one embodiment, the first driving voltage is determined based on an initial set current value and the maximum withstand voltage of the electrochromic device 20.

[0083] In one embodiment, the upper limit of the maximum withstand voltage range is: V device +0.1V, the lower limit of the maximum withstand voltage range is: V device -0.1V, where V device This is the maximum withstand voltage of the electrochromic device.

[0084] In one embodiment, the method for determining the maximum withstand voltage includes: performing a cycle life test on the electrochromic device under the maximum withstand voltage, such that the number of cycles of the electrochromic device is greater than a preset number of cycles.

[0085] In one embodiment, the first driving voltage can be determined by equation (1).

[0086] In one embodiment, the ratio of the first driving voltage to the maximum withstand voltage ranges from 1 to 5.

[0087] In one embodiment, the second driving voltage changes in a positive correlation with the driving current value.

[0088] In one embodiment, the second driving voltage can be adjusted by equation (2).

[0089] In one embodiment, the sampler 200 is specifically used to: collect the driving current value transmitted to the electrochromic device 20 at preset time intervals, or collect the driving current value transmitted to the electrochromic device 20 in real time.

[0090] In one embodiment, as shown in FIG3, the control device 10 further includes a current limiter 400, which is connected between the driver 100 and the electrochromic device 20. The current limiter 400 is used to limit the current flowing to the electrochromic device 20 according to an initial set current value.

[0091] Since the impedance of the electrochromic device 20 is low in the initial state, the current limiter 400 can prevent the driving current from being too large and excessively consuming the lifespan of the electrochromic device 20. The specific parameters of the initial current value can be set according to actual needs, and a value that will not excessively affect the color-changing speed of the electrochromic device 20 can be selected.

[0092] The current limiter 400 may include an electronic current limiter.

[0093] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0094] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0095] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0096] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A power supply control method for an electrochromic device, characterized in that, include: When energized, a first driving voltage is provided to the electrochromic device, so that the voltage drop across the electrochromic device reaches the maximum withstand voltage range. The driving current value is collected and transmitted to the electrochromic device; The first driving voltage is adjusted to the second driving voltage according to the driving current value, so that the voltage division on the electrochromic device maintains the maximum withstand voltage range.

2. The power supply control method as described in claim 1, characterized in that, The upper limit of the maximum withstand voltage range is: V device +0.1V, the lower limit of the maximum withstand voltage range is: V device -0.1V, where V device This is the maximum withstand voltage of the electrochromic device; The method for determining the maximum withstand voltage includes: performing a cycle life test on the electrochromic device under the maximum withstand voltage, such that the number of cycles of the electrochromic device is greater than a preset number of cycles.

3. The power supply control method as described in claim 1 or 2, characterized in that, The first driving voltage is determined based on the initial set current value and the maximum withstand voltage of the electrochromic device.

4. The power supply control method according to any one of claims 1-3, characterized in that, The first driving voltage is determined by the following relationship: V total1 =I0×R wire +V device ; Among them, V total1 The first driving voltage is given, I0 is the initial set current value, and R is the current value. wire V is the line resistance. device This is the maximum withstand voltage of the electrochromic device.

5. The power supply control method according to any one of claims 1-4, characterized in that, The ratio of the first driving voltage to the maximum withstand voltage ranges from 1 to 5.

6. The power supply control method according to any one of claims 1-5, characterized in that, The second driving voltage changes in a positive correlation with the driving current value.

7. The power supply control method according to any one of claims 1-6, characterized in that, The second driving voltage is adjusted by the following formula: V total2 =I1×R wire +V device ; Among them, V total2 I1 is the second driving voltage, and R is the driving current value. wire V is the line resistance. device This is the maximum withstand voltage of the electrochromic device.

8. The power supply control method according to any one of claims 1-7, characterized in that, The acquisition and transmission of the drive current value to the electrochromic device includes: The driving current value transmitted to the electrochromic device is collected at preset time intervals; or The driving current value is collected and transmitted to the electrochromic device in real time.

9. The power supply control method as described in claim 8, characterized in that, The driving current values ​​transmitted to the electrochromic device are collected at preset time intervals, wherein the preset time intervals continuously shorten over time; and / or The preset time interval ranges from 100 milliseconds to 10 seconds.

10. A control device for driving an electrochromic device, characterized in that, include: A driver is used to provide a first driving voltage when energized, so that the voltage drop across the electrochromic device reaches the maximum withstand voltage range. A sampler is used to collect the driving current value transmitted from the driver to the electrochromic device; The processor is configured to determine a second drive voltage based on the drive current value; The driver is also used to adjust the first driving voltage to the second driving voltage so that the voltage division on the electrochromic device maintains the maximum withstand voltage range.

11. The control device as claimed in claim 10, characterized in that, The first driving voltage is determined based on the initial set current value and the maximum withstand voltage of the electrochromic device; and / or The upper limit of the maximum withstand voltage range is: V device +0.1V, the lower limit of the maximum withstand voltage range is: V device -0.1V, where V device The maximum withstand voltage of the electrochromic device; and / or The method for determining the maximum withstand voltage includes: performing a cycle life test on the electrochromic device under the maximum withstand voltage, such that the number of cycles of the electrochromic device is greater than a preset number of cycles; and / or The first driving voltage is determined by the following relationship: V total1 =I0×R wire +V device Among them, V total1 The driving voltage is I0, the initial set current value is R. wire V is the line resistance. device The maximum withstand voltage of the electrochromic device; and / or The ratio of the first driving voltage to the maximum withstand voltage ranges from 1 to 5; and / or The second driving voltage changes in a positive correlation with the driving current value; and / or The second driving voltage is adjusted by the following formula: V total2 =I1×R wire +V device Among them, V total2 I1 is the driving voltage, R is the driving current value, and R is the driving voltage. wire V is the line resistance. device The maximum withstand voltage of the electrochromic device; and / or The sampler is used to collect the driving current value transmitted to the electrochromic device at preset time intervals, or to collect the driving current value transmitted to the electrochromic device in real time.

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