CN113156731B

CN113156731B - Method for controlling electrochromic device

Info

Publication number: CN113156731B
Application number: CN202010076555.XA
Authority: CN
Inventors: 吴忠恕
Original assignee: Beijing Kaiyang Liangwei Technology Co ltd; Qingdao Kaios Photoelectric Technology Co ltd
Current assignee: Beijing Kaiyangliang Micro Technology Co Ltd; Qingdao Kaios Photoelectric Technology Co ltd
Priority date: 2020-01-23
Filing date: 2020-01-23
Publication date: 2022-06-07
Anticipated expiration: 2040-01-23
Also published as: CN113156731A

Abstract

The invention relates to a method for controlling an electrochromic device, wherein a self-correction process is initiated when no discoloration command is received, in the event of a complete discoloration process, wherein a short-circuit discharge resistor Rsc for short-circuiting the electrochromic device is adjusted and/or a target electrical quantity Q _ target required for achieving the discoloration target is adjusted.

Description

Method for controlling electrochromic device

Technical Field

The invention relates to a method of controlling an electrochromic device, wherein upon receiving a color change instruction, a color change process is initiated; and/or initiate a self-correction procedure when no color change instruction is received in the case of a complete color change procedure.

Background

An electrochromic device is a device capable of changing its light transmittance in accordance with an applied electrical signal. Applications of electrochromic devices include, but are not limited to: architectural windows, information displays, filters and dimmers, rear-view mirrors in vehicles, skylights and windows, glasses, helmets with masks, goggles for skiing, surfaces with variable thermal emissivity or camouflage equipment.

Theoretically, the simplest way to drive an electrochromic device (ECD) is to apply a coloring or discoloring pulse within some specified time interval. The typical pulse used is a rectangular pulse specified by parameters such as voltage and time. In the case of coloration, the coloration voltage and the coloration time are defined. The change in transmittance of the ECD is related to the amount of electricity applied to or extracted from the ECD. Therefore, the duration of the pulse is very important. To discolor the electrochromic device, voltage pulses of opposite polarity are applied and a discoloring voltage and a discoloring time are defined. The applied voltage needs to be suitable for the ECD used. Too much voltage will destroy the ECD, at least not for a prolonged period of time.

In practice, the method of making a transition based on a predetermined time interval is not effective in all applications for two main reasons. First, the transition speed of an electrochromic device is very dependent on the temperature at which the device is operated. Second, the transition speed of an electrochromic device may also vary over its lifetime. Thus, the old device may have a different transition speed than the new device. These aspects imply that: in order to achieve the same light transmission in the colored state and the bleached state, the coloring pulse and the bleaching pulse must have different durations, respectively, depending on the operating conditions and/or device history. In other words, under different conditions, voltage pulses of the same duration result in different degrees of coloration or discoloration.

Most prior art control methods for electrochromic devices do not take into account aging of the device. The new just produced ECD has properties that differ from those of ECDs that have been subjected to thousands of operating cycles. Therefore, these devices cannot be controlled with a set of parameters that are not varied for optimal performance.

Earlier, attempts have been made to solve these problems. A safe way to achieve the appropriate coloration time and fade time is to actually measure the transmission and interrupt the coloration or fade when the desired transmission level is reached. For example, time control is combined with the measurement of a physical property (e.g., voltage, current, or optical transmittance of the glass article). However, this requires additional tools to make the optical measurements, making the system more complex. There may be situations where the transmittance cannot be measured, such as non-transparent displays. It may also be the case that the optical sensor may be in line of sight, thus interfering with the field of view in the consumer product or the light beam in the instrument.

Disclosure of Invention

The present invention aims to solve the above-mentioned problems in the prior art.

The object is achieved by a method of controlling a method of an electrochromic device, wherein upon receiving a color change instruction, a color change process is initiated, the color change process comprising the steps of:

calculating a target electric quantity Q _ target required by reaching a color change target;

applying a voltage pulse to the electrochromic device while measuring a cumulative amount of color change electricity Qsum, wherein when no voltage is applied to the voltage pulse, the electrochromic device is short-circuited while measuring a short-circuit discharge electricity amount Qsc;

and stopping the color changing process when the color changing accumulated electric quantity Qsum reaches the target electric quantity Q _ target.

On the other hand, in the method of controlling an electrochromic device according to the present invention, in the case where a complete round of a discoloration process has been passed, when a discoloration instruction is not received, a self-correction process is initiated in which the short-circuit discharge resistance Rsc for short-circuiting the electrochromic device is adjusted and/or the target amount of electricity Q _ target required to reach the discoloration target is adjusted.

Various aspects of the invention are set forth in greater detail below with respect to the accompanying figures.

Drawings

Fig. 1 shows a schematic diagram b) of an equivalent circuit a) and an exemplary structure of an electrochromic device according to the invention;

fig. 2 shows a state a) in which no voltage is applied and short-circuiting is performed and a state b) in which voltage is applied, in the electrochromic device according to the invention;

fig. 3 shows a short-circuit loop a) inside the device and a short-circuit loop b) outside the device when no voltage is applied to the electrochromic device according to the invention;

FIG. 4 is a schematic diagram showing the main control flow of an electrochromic device according to the invention;

FIG. 5 is a schematic diagram of an electrochromic device according to the invention measuring a cumulative amount of change in color Qsum;

FIG. 6 is a photograph showing an exemplary gray scale state controller of an electrochromic device according to the present invention;

FIG. 7 is a schematic diagram of an electrochromic device according to the present invention, which determines each gray scale state by a unit area of a color-changing accumulated electrical quantity Qsum, and a static short-circuit electrical quantity threshold value Qscs _ threshold in each gray scale state;

fig. 8 is a schematic diagram illustrating a coloring process of an electrochromic device according to the present invention;

fig. 9 is a schematic diagram illustrating a fading process of an electrochromic device according to the present invention;

fig. 10 is a schematic diagram illustrating the adjustment of the short-circuit discharge resistance Rsc during the self-calibration process of the electrochromic device according to the present invention;

fig. 11 is a schematic diagram illustrating the adjustment of the target electrical quantity Q _ target during the self-calibration process of the electrochromic device according to the present invention; and

fig. 12 shows an exemplary photograph of an electrochromic device according to the invention.

Detailed Description

Unless otherwise indicated, all publications, patent applications, patents, and other references mentioned in this application are herein incorporated by reference in their entirety and for all purposes to be considered as if fully set forth herein.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.

When an amount, concentration, or other value or parameter is expressed in terms of a range, preferred range, or upper preferable numerical value and lower preferable numerical value, it is understood that any range defined by any pair of upper range limits or preferred numerical values in combination with any lower range limits or preferred numerical values is specifically disclosed, regardless of whether the range is specifically disclosed. Unless otherwise indicated, numerical ranges set forth herein are intended to include the endpoints of the ranges, and all integers and fractions within the ranges.

Equivalent circuit and base state

Fig. 1 shows a schematic diagram b) of an equivalent circuit a) and an exemplary structure of an electrochromic device according to the invention.

Rt1 in FIG. 1a represents the equivalent resistance of the upper TCO in FIG. 1b, Rt2 in FIG. 1a represents the equivalent resistance of the lower TCO in FIG. 1b, and the middle region EC enclosed by a dotted line corresponds to the structure of PB/SPE/WO3 in FIG. 1b, and is used as the reaction region of the chemical electrochromic material, wherein PB is Prussian blue (ferric ferrocyanide, the formula of Fe₄[Fe(CN)₆]₃·xH₂O), SPE is a solid polymer electrolyte and WO3 is tungsten trioxide. In fig. 1a, from the trend of the current Ic, Ic flows through the whole component from point a to point B, which corresponds to the current flow direction of Ic in fig. 1B. Since the TCO has very good conductivity and the sheet resistance is only about 10 Ω/sq, a voltage difference is formed between the TCO parallel panels on the upper and lower sides, and thus the chemical electrochromic reaction occurs in the PB/SPE/WO3 located inside.

Fig. 2 shows a state a) in which no voltage is applied and short-circuited and a state b) in which voltage is applied, which are controlled by a switch X and a switch Y, according to the electrochromic device of the present invention. When the switch X is disconnected and the switch Y is connected, the ECD enters a short-circuit discharge mode; when the switch X is turned on and the switch Y is turned off, the ECD generates a chemical electrochromic reaction due to an externally applied voltage, and the current meter Ammeter measures a current flowing through the ECD and transmits the measured current to the controller MCU, thereby providing a basis for calculating the accumulated electric quantity Qsum. Here, the output voltage Vout of the voltage pulse Driver is adjusted, for example, with a PWM duty ratio.

The accumulated charge amount Qsum is defined as the integral over time of the current through the ECD measured by the Ammeter ammometer at the externally applied voltage during the discoloration. The value of the accumulated charge amount Qsum has a positive correlation with the degree of discoloration of the ECD. The Ammeter Ammeter in FIG. 2a does not measure the current value, only the Ammeter Ammeter in FIG. 2b can measure the current value.

The short-circuit discharge power Qsc is defined as the power discharged per unit time measured by the power Amplifier Charge _ Amplifier at the time of short-circuit discharge of the ECD. The externally applied voltage is regulated and controlled by comparing the short circuit discharge charge Qsc with a dynamic short circuit charge interval < Qscd _ max, Qscd _ min >. The Charge Amplifier Charge _ Amplifier in fig. 2b can not measure the electric quantity, and only the Charge Amplifier Charge _ Amplifier in fig. 2a can measure the electric quantity. In the standby state, i.e., the non-color change state, short-circuit discharge resistance Rsc may be adjusted and controlled by comparing short-circuit discharge power amount Qsc with static short-circuit power amount interval < Qscs _ max, Qscs _ min >.

Fig. 3 shows a short-circuit a) inside the device and a short-circuit b) outside the device when no voltage is applied to the electrochromic device according to the invention.

Fig. 3a shows the discharge Loop _ a of the chemical equivalent capacitor Ce during open circuit, which occurs inside the device and therefore cannot be measured. Fig. 3B is a circuit diagram of an increased external short-circuit discharge resistance Rsc, thereby providing a measurable discharge Loop _ B, and discharging through this Loop, so that the stress generated during the rapid charging of the first and second color-changing material layers is released, thereby reducing the probability of film cracking.

As the number of redox reactions increases, the saturation voltage Vce of the aged chemical equivalent capacitance Ce in the completely colored state and/or the completely discolored state after 10000 cycles, for example, does not coincide with the value in the unaged state. In the discharge Loop of Loop _ B,

the current Ib is Vce/(Rt1+ Rsc + Rt2)

Among them, Rt1 and Rt2 are stable ceramic materials, are stable in sheet resistance to EC, and can be regarded as constant values. Therefore, when Vce deteriorates and becomes smaller as the number of times of use increases, and short-circuit discharge resistance Rsc is also made smaller accordingly, the value of current Ib can be kept at a relatively stable level, and thus measured short-circuit discharge electric quantity Qsc is also relatively stable.

Main control flow

The invention relates to a method for controlling an electrochromic device, wherein upon receiving a color change command, a color change process is initiated, said color change process comprising the steps of:

applying a voltage pulse to the electrochromic device while measuring a color change cumulative charge Qsum, wherein when no voltage is applied to the voltage pulse, the electrochromic device is shorted while measuring a short circuit discharge charge Qsc;

and stopping the color change process when the color change accumulated electric quantity Qsum reaches the target electric quantity Q _ target.

Fig. 4 is a schematic diagram showing the main control flow of the electrochromic device according to the present invention.

After the controller MCU is powered on, the internal parameters of the controller MCU are initialized, meanwhile, the ECD is initialized, and then whether a color change instruction is received or not is judged. If a color change instruction is received, starting the calculation of the accumulated electric quantity; if no color change instruction is received, a self-correction mechanism is initiated.

Fig. 5 is a schematic diagram illustrating the electrochromic device measuring the accumulated amount of discoloring electricity Qsum according to the present invention, wherein a Current Buffer Current _ Buffer has a storage function, and the value measured by a Current meter ammer is updated into the Buffer after a certain period of time; storing the total electric quantity accumulated in the ECD currently by using a buffer with a storage function as accumulated electric quantity Qsum; the second Timer sec _ Timer is triggered every real-time second.

When the calculation of the accumulated electric quantity is started, whether coloring or fading is needed is judged, and then a corresponding voltage regulation mechanism is started. The Current Buffer is updated to the value of the Ammeter at every second, namely, the amount of electricity flowing in every second. When the second Timer sec _ Timer is triggered every second, the value stored in the Current Buffer Current _ Buffer is accumulated to a Buffer used for storing the accumulated electric quantity Qsum, so that the accumulated electric quantity Qsum of the ECD at the moment is obtained, and the value size of the accumulated electric quantity Qsum has positive correlation with the degree of color change.

Determining a target charge quantity Q _ target

The charge storage density is related to the coating thickness of the PB film/WO 3 film. For example, if the thickness of the coating film of PB is 400-600 nm and the thickness of the coating film of WO3 is 500-800 nm, the maximum allowable storage capacity per unit area is about 14-16 mC/cm². At 16mC/cm²For example, pairThe color change area is 2800cm²ECD of (a):

electric quantity of Lv 4: 16X 2800 ═ 44800(mC)

Electric quantity of Lv 3: 12 x 2800 ═ 33600(mC)

Electric quantity of Lv 2: 8X 2800 ═ 22400(mC)

Electric quantity of Lv 1: 4X 2800 ═ 11200(mC)

Electric quantity of Lv 0: 0X 2800 ═ 0(mC)

The target electric quantity Q _ target may be for any one of Lv 0-Lv 4, and the maximum allowable total electric quantity refers to an electric quantity required to reach Lv 4.

When the maximum allowable total electric quantity of the Lv4 is reduced, for example, 90% remains, other orders Lv3 to Lv0 are calculated according to the same proportion.

Determining a dynamic short circuit electric quantity interval < Qscd _ max, Qscd _ min >

In accordance with an embodiment of the method of the present invention, the short circuit discharge charge Qsc is compared to a predetermined dynamic short circuit charge interval < Qscd _ max, Qscd _ min >, wherein the applied voltage of the voltage pulse is adjusted when the short circuit discharge charge Qsc is outside the dynamic short circuit charge interval < Qscd _ max, Qscd _ min >.

According to another embodiment of the method of the invention, said dynamic short circuit capacity interval < Qscd _ max, Qscd _ min > is determined by the average of the capacities measured when said electrochromic device is short-circuited a plurality of times in the fully colored state.

According to another embodiment of the method of the present invention, said dynamic short circuit charge interval < Qscd _ max, Qscd _ min > is determined at a temperature of 60 to 100 ℃, preferably 70 to 90 ℃, more preferably about 80 ℃.

The dynamic short circuit charge threshold Qscd _ threshold is defined as: the ECD is an electric energy which is discharged in an average amount per unit area per unit time measured at the time of short-circuit discharge in a completely colored state, for example, at 80c, in the first 100 cycles after activation of charge and discharge.

Qscd _ max may be, for example, 90% of Qscd _ threshold, and Qscd _ min may be, for example, 60% of Qscd _ threshold.

The ECD fully colored state is defined as: a dc voltage of, for example, 1.4V is applied to the ECD, and the current measured, for example, at 80c is a steady minimum value near zero, and the visible light (VIS) penetration measurement of the ECD is held at a steady value (typically less than 10%) for at least 30 minutes.

Grey scale state

Fig. 6 is a photograph showing an exemplary gray scale state controller of an electrochromic device according to the present invention. Tint Button and Clear Button. The color-changing LED is used for gray-scale control of ECD and is divided into Lv 1-Lv 4 levels, Lv0 level represents a transparent state and is represented by a white LED, the rest is represented by a blue LED and relative positions of the blue LED, and the higher the position is, the deeper the color-changing depth is.

According to another embodiment of the method of the present invention, said grey scale state is determined by said accumulated electrical discoloration amount Qsum.

Fig. 7 is a schematic diagram illustrating that the electrochromic device according to the present invention determines each gray scale state by the color change accumulated power amount Qsum per unit area and the static short circuit power threshold value Qscs _ threshold in each gray scale state.

In the process of initializing the control parameters, the color change area of the ECD of the specification and the set short-circuit discharge time need to be considered. Specifically, at room temperature (for example, 25 ℃), the relationship between the static short-circuit electricity threshold value Qscs _ threshold and the dynamic short-circuit electricity threshold value Qscd _ threshold, that is, the corresponding relationship between the cumulative electricity per unit area of the ECD (Qsum divided by the color-changing area of the ECD) and the electricity per unit area of short-circuit discharge per unit time (Qsc divided by the color-changing area of the ECD divided by the short-circuit discharge time) is determined by using a standard sheet.

Colouring process

In accordance with another embodiment of the method of the present invention, the color change process is a coloring process, wherein the applied voltage of the voltage pulse is decreased when the short circuit discharge charge Qsc is greater than the dynamic short circuit charge interval < Qscd _ max, Qscd _ min >; increasing the applied voltage of the voltage pulse when the short circuit discharge charge Qsc is less than the dynamic short circuit charge interval < Qscd _ max, Qscd _ min >.

FIG. 8 is a schematic diagram illustrating a coloring process of an electrochromic device according to the present invention, wherein a buffer with a memory function is used to store a Charge value calculated by a Charge Amplifier Charge _ Amplifier after short-circuit discharge as a short-circuit discharge Charge Qsc; the short-circuit Timer SC _ Timer is used to control the short-circuit discharge time.

After the coloring voltage regulation mechanism is started, short-circuit discharge is performed on the ECD within a time period (e.g., 1-5 ms) timed by the short-circuit Timer SC _ Timer, short-circuit discharge power Qsc is stored in the buffer, and the short-circuit discharge power Qsc is compared with the dynamic short-circuit power interval < Qscd _ max, Qscd _ min >, for example, to regulate the applied voltage of the voltage pulse in a PWM duty ratio manner. The output value and power of the DC voltage source can be varied by varying the PWM duty cycle to control the corresponding output switch. Meanwhile, the value measured by the Ammeter Ammeter is updated to the Current Buffer Current _ Buffer every second.

For example, the conditions for the coloring process are: ECD color change area is 2800cm²The PWM duty cycle is 512/1024, and the short-circuit Timer SC _ Timer is controlled to be fixed for 5 ms. According to fig. 8, the measured power during this time period is, for example, the following three cases: (A)500 mu C, (B)400 mu C, (C)200 mu C, and the electric quantity per unit time (per second) is calculated as:

500μC/5ms＝(500×10^-6)/(5×10^-3)＝100mC/s (A)

400μC/5ms＝(400×10^-6)/(5×10^-3)＝80mC/s (B)

200μC/5ms＝(200×10^-6)/(5×10^-3)＝40mC/s (C)

at this time, the table lookup is performed to obtain<Qscd_max,Qscd_min>For example, is<21.43μC/cm²,32.14μC/cm²>And it is known that ECD discolored area is 2800cm²Then the corresponding range is<60mC,90mC>Then, the above three cases correspond to operations of:

(A) the duty cycle of the PWM is reduced from 512/1024 to 511/1024.

(B) The duty cycle of the PWM is maintained at 512/1024 by 512/1024.

(C) The duty cycle of the PWM is increased from 512/1024 to 513/1024.

Fading process

In accordance with another embodiment of the method of the present invention, the color change process is a color fading process, wherein the applied voltage of the voltage pulse is decreased when the short circuit discharge charge Qsc is less than the dynamic short circuit charge interval < Qscd _ max, Qscd _ min >; increasing the applied voltage of the voltage pulse when the short circuit discharge charge Qsc is greater than the dynamic short circuit charge interval < Qscd _ max, Qscd _ min >.

Fig. 9 is a schematic view showing a fading process of an electrochromic device according to the present invention.

The fading process is substantially the same mechanism as the previously described coloring process, differing mainly in that:

on the one hand, during discharge bleaching, the applied voltage of the voltage pulses is adjusted, for example in PWM duty cycle, by comparing the short circuit discharge charge Qsc with the dynamic short circuit charge interval < Qscd _ max, Qscd _ min >, which is exactly the opposite of the charge coloration process.

For example, the conditions of the fading process are: ECD color change area is 2800cm²The PWM duty cycle is 512/1024, and the short-circuit Timer SC _ Timer is controlled to be fixed for 5 ms. According to fig. 9, the amount of power measured during this time period is, for example, the following three cases: (A)500 mu C, (B)400 mu C, (C)200 mu C, and the electric quantity per unit time (per second) is calculated as:

500μC/5ms＝(500×10^-6)/(5×10^-3)＝100mC/s (A)

400μC/5ms＝(400×10^-6)/(5×10^-3)＝80mC/s (B)

200μC/5ms＝(200×10^-6)/(5×10^-3)＝40mC/s (C)

(A) the duty cycle of the PWM is increased from 512/1024 to 513/1024.

(B) The duty cycle of the PWM is maintained at 512/1024 by 512/1024.

(C) The duty cycle of the PWM is reduced from 512/1024 to 511/1024.

On the other hand, when the applied voltage value of the voltage pulse is adjusted to about 10% of the PWM duty ratio during the discoloring, the applied voltage is not decreased any more, but the voltage output is maintained at a fixed value of about 10% to make the ECD continuously trickle-discharge at the voltage. In this case, 102/1024 is defined as 10%. As a special mechanism of the fading process, trickle discharge is performed at a trickle duty cycle.

Self-calibration

Herein, one round of charge and discharge means to undergo a complete process of discoloration and coloring cycle, i.e., a complete process of charge and discharge cycle. When the current gray-scale state is Lv0, for example, a complete charging and discharging process is Lv0 → Lv4 → Lv4 → Lv 0. When the current gray-scale state is Lv2, for example, a complete charging and discharging process is Lv2 → Lv4 → Lv0 → Lv2, or Lv2 → Lv0 → Lv4 → Lv 2.

Self-correcting-regulating short-circuit discharge resistor Rsc

In accordance with another embodiment of the method of the present invention, during said self-calibration process, said short circuit discharge capacity Qsc is compared with a predetermined static short circuit capacity interval < Qscs _ max, Qscs _ min >, wherein when said short circuit discharge capacity Qsc is less than said static short circuit capacity interval < Qscs _ max, Qscs _ min >, said short circuit discharge resistance Rsc is decreased; and increasing the short circuit discharge resistance Rsc when the short circuit discharge capacity Qsc is greater than the static short circuit capacity interval < Qscs _ max, Qscs _ min >.

Fig. 10 is a schematic diagram illustrating the adjustment of the short-circuit discharge resistance Rsc during the self-calibration process of the electrochromic device according to the present invention.

The short-circuit discharge resistance Rsc is corrected once after one complete charge and discharge cycle at room temperature (e.g., 25 ℃).

The method of correcting the short-circuit discharge resistance Rsc includes: short-circuit discharging is carried out on the ECD within a time period (for example, 1-5 ms) counted by the short-circuit Timer SC _ Timer, short-circuit discharging electric quantity Qsc is stored in a buffer, and a range < Qscs _ max, Qscs _ min > is obtained through table lookup according to the area of the ECD. Short-circuit discharge resistance Rsc is adjusted by comparing short-circuit discharge power Qsc with a static short-circuit power interval < Qscs _ max, Qscs _ min >. And after the short-circuit discharge resistor Rsc is adjusted, waiting for the next round of complete charging and discharging, and correcting the short-circuit discharge resistor Rsc of the next round at the temperature of 20-30 ℃.

Determining a static short circuit electric quantity interval < Qscs _ max, Qscs _ min >

According to another embodiment of the method of the present invention, the static short-circuit charge interval < Qscs _ max, Qscs _ min > is determined by an average of the charges measured when the electrochromic device is short-circuited in the respective grey-scale state a plurality of times.

According to another embodiment of the method of the present invention, said static short circuit charge interval < Qscs _ max, Qscs _ min > is determined at room temperature, preferably at a temperature of 15 to 35 ℃, more preferably at a temperature of about 25 ℃.

The static short circuit charge threshold Qscs _ threshold is defined as: after activation of charge and discharge, the ECD averages the short-circuit discharge capacity measured a plurality of times within a time period (for example, 5ms) measured by the short-circuit Timer SC _ Timer for each gray-scale state corresponding to a different degree of coloring state, for example, Lv1 to Lv4, at room temperature (for example, 25 ℃) for the first 100 cycles, and divides the average by the short-circuit discharge time (for example, 5ms) and the ECD coloring area to obtain the static short-circuit capacity threshold Qscs _ threshold corresponding to each of the four gray-scale states Lv1 to Lv 4.

Qscs _ max can be, for example, 110% of Qscs _ threshold, and Qscs _ min can be, for example, 90% of Qscs _ threshold.

The table look-up method of the static short circuit electric quantity interval < Qscs _ max, Qscs _ min >:

the color changing area of the ECD is known, and in a standby state, the corresponding gray scale state can be obtained by calculating the accumulated electric quantity of the ECD and the color changing area at the moment. If the color changes are normal gray levels, the value will fall into one of the four gray levels Lv 1-Lv 4. The corresponding unit area electric quantity of short circuit discharge in unit time can be found by looking up a table through the gray scale state, and < Qscs _ max, Qscs _ min > is obtained by calculation according to the ECD color change area.

Self-correcting-adjusting maximum allowable value of target electric quantity Q _ target

According to another embodiment of the method according to the present invention, during said self-calibration, the maximum allowable value of said target charge quantity Q _ target is decreased when the time of said discoloration process is too long, otherwise said maximum allowable value of said target charge quantity Q _ target is gradually restored to the original set value.

Fig. 11 is a schematic diagram illustrating the adjustment of the target electric quantity Q _ target during the self-calibration process of the electrochromic device according to the present invention.

When the charging and discharging time is too long and the Watchdog Timer sends out a timeout signal, the correction of the target electric quantity Q _ target is triggered, and the maximum allowable value of the target electric quantity Q _ target is corrected to 90%. After a new round of charging and discharging, if the target electric quantity Q _ target correction is not triggered, the maximum allowable value of the current target electric quantity Q _ target is corrected to 110% until the original set value is recovered.

Length to width wire ratio

The definition of the long-to-wide pulling ratio will be described by taking the illustrated sample as an example, the length of the long side is 70cm, the length of the short side is 40cm, and the lead wires are arranged on the long side to be pulled out, so that the long-to-wide pulling ratio is 7: 4.

Because the static short circuit charge threshold value Qscs _ threshold and the dynamic short circuit charge threshold value Qscd _ threshold are both measured data per unit area, they have a high positive correlation with the long-to-wide wire ratio.

For samples with the same 7:4 long-to-wide pull-cord ratio, such as 70cm × 40cm and 140 × 80cm, the static short-circuit charge threshold Qscs _ threshold of the two samples can be shared, but since the areas of the two samples are four times, the Qscs _ max and Qscs _ min of the two samples are also four times of the relationship; the dynamic short circuit charge threshold value Qscd _ threshold is also the same.

However, the two thresholds for samples with different aspect ratios cannot be shared.

The particular embodiments described above are illustrative of the principles of the present application and should not be construed as limiting the scope of the invention in any way. Rather, it is to be clearly understood that resort may be had to other embodiments, modifications, and equivalents thereof which, after reading the description herein, may suggest themselves to those skilled in the art without departing from the spirit of the present invention.

Claims

1. The method for controlling the electrochromic device comprises the steps that the electrochromic device comprises a short-circuit discharge resistor Rsc for short-circuiting the electrochromic device, and under the condition that a complete color change process is performed, when a color change instruction is not received, a self-correction process is started, the short-circuit discharge resistor Rsc for short-circuiting the electrochromic device is adjusted, and a target electric quantity Q _ target required for achieving a color change target is adjusted, wherein the complete color change process refers to a complete color change and coloring cycle process;

during the self-calibration process, shorting the electrochromic device while measuring a short circuit discharge charge Qsc, comparing the short circuit discharge charge Qsc to a predetermined static short circuit charge interval < Qscs _ max, Qscs _ min >, wherein the short circuit discharge resistance Rsc is decreased when the short circuit discharge charge Qsc is less than the static short circuit charge interval < Qscs _ max, Qscs _ min >; increasing the short circuit discharge resistance Rsc when the short circuit discharge capacity Qsc is greater than the static short circuit capacity interval < Qscs _ max, Qscs _ min >; the static short-circuit electric quantity interval < Qscs _ max, Qscs _ min > is determined by the average value of the electric quantity measured when the electrochromic device is short-circuited under each gray scale state for multiple times;

in the self-correction process, when the time of the color changing process is too long, the correction of the target electric quantity Q _ target is triggered, the maximum allowable value of the target electric quantity Q _ target is reduced, and after a new round of charging and discharging, if the correction of the target electric quantity Q _ target is not triggered, the maximum allowable value of the target electric quantity Q _ target is gradually recovered to an original set value.

2. Method according to claim 1, characterized in that the static short circuit charge interval < Qscs _ max, Qscs _ min > is determined at room temperature.

3. Method according to claim 1, characterized in that the static short circuit charge interval < Qscs _ max, Qscs _ min > is determined at a temperature of 15 to 35 ℃.

4. Method according to claim 1, characterized in that the static short circuit charge interval < Qscs _ max, Qscs _ min > is determined at a temperature of about 25 ℃.

5. The method according to any of claims 1 to 4, wherein the grey scale state is determined by a colour change accumulated charge Qsum.