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CN-122018205-A - Control method of all-solid-state organic electrochromic glass

CN122018205ACN 122018205 ACN122018205 ACN 122018205ACN-122018205-A

Abstract

The invention particularly relates to a control method of all-solid-state electrochromic glass, which relates to the technical field of electrochromic devices and comprises the steps of defining four transmittance gears adapting to different scenes, adopting a main sub-control three-layer controller architecture, designing a base and switching three voltage driving time sequences to high/low transmittance, and providing function guidance, hardware support and bottom logic for the precise switching of the transmittance of multiple gears. The invention presets the four-gear transmittance proportion, is accurately adapted to various scenes such as daily office, sun-shading and sun-screening, privacy protection and the like, realizes lighting and energy conservation, privacy and comfort, simultaneously defines the requirement of multi-gear functions, provides clear function guidance for subsequent hardware architecture design and voltage time sequence optimization, and is characterized in that a main controller is combined with a distributed and separately controlled three-layer topology architecture to adapt to the glass load characteristic, thus supporting the synchronous control of a plurality of pieces of glass, supporting independent adjustment of single glass and providing reliable hardware support for multi-gear transmittance switching.

Inventors

  • LI XIUXIU

Assignees

  • 合肥秀强智能科技有限公司

Dates

Publication Date
20260512
Application Date
20260227

Claims (9)

  1. 1. A method for controlling an all-solid-state inorganic electrochromic glass, comprising: Defining four kinds of transmittance gears adapting to different scenes, adopting a main sub-control three-layer controller architecture, designing a base and switching three voltage driving time sequences to high/low transmittance, and providing function guidance, hardware support and bottom logic for the precise switching of the transmittance of multiple gears; When the optical contrast is reduced, performing: Applying constant fading voltage to electrochromic glass, monitoring the current change rate or current density in real time, stopping after reaching the standard, and recording the initial open circuit potential; Applying a composite driving voltage of direct current bias superposition sinusoidal alternating current signals, performing full-band scanning according to a preset sweep strategy, and matching relaxation frequencies of trap ions with different depths; Applying high-voltage square wave pulse within a preset time after the sweep is finished, and pumping out activated ions to the counter electrode; Cutting off all power supplies, allowing the device to stand for a preset period of time, collecting a final open-circuit potential after the electrochemical potential is balanced, and judging the fading effect by comparing the potential differences before and after.
  2. 2. The method for controlling an all-solid-state electrochromic glass according to claim 1, wherein a constant fading voltage is applied to the electrochromic glass, the current change rate or current density is monitored in real time and stopped after reaching the standard, and an initial open circuit potential is recorded, specifically comprising: The method comprises the steps of adopting a direct current power supply as a driving source, connecting a positive electrode of the power supply with a working electrode of electrochromic glass, and connecting a negative electrode of the power supply with a counter electrode; Applying a fade voltage of constant direction and constant magnitude to the device The voltage direction points to the direction that ions are separated from the electrochromic layer; after the voltage is applied, the computer terminal continuously collects and records the real-time working current Simultaneously drawing a current-time curve; At the stop of application After that, the initial open circuit potential of the device is acquired 。
  3. 3. The method for controlling all-solid-state electrochromic glass according to claim 2, further comprising the step of judging whether the stop condition is required to meet any one of a current change rate threshold value and a current density threshold value at the same time, specifically comprising the following steps: calculating the adjacent time as Current change rate of two sampling points of (2) When the absolute value of the current change rate of the continuous k sampling points is all satisfied < Preset threshold value When in use; Calculating the real-time current density of the device, and when the absolute values of the current densities of the continuous k sampling points are smaller than the background leakage current threshold value; After which the slave application is recorded The time interval until the judging and stopping conditions are met, namely the total duration of the fading process 。
  4. 4. The control method of all-solid-state electrochromic glass according to claim 1, wherein the method is characterized in that a composite driving voltage of direct current bias superimposed sine alternating current signals is applied, full-band scanning is performed according to a preset sweep strategy, and relaxation frequencies of trap ions with different depths are matched, and specifically comprises the following steps: a composite driving mode of direct current bias superposition sinusoidal alternating current signals is adopted, and the signal expression is as follows: , is a direct current bias voltage; Is the amplitude of the alternating current disturbance signal; the frequency sweep frequency is dynamically changed along with time; Time is; The monitoring index is the polarization state fluctuation amplitude of the device, and specifically, the electrochemical impedance spectrum is collected in real time, and the monitoring alternating current component is judged: when the sweep frequency signal finishes the full-frequency band coverage of 1000Hz to 0.1Hz, the total duration reaches the preset value And stopping outputting the composite signal.
  5. 5. The method for controlling all-solid-state electrochromic glass according to claim 4, wherein the frequency band action mechanism and principle of the sweep frequency are as follows: the high frequency band corresponds to the relaxation frequency of the interface double electric layer adsorption ions, can break the electrostatic adsorption balance of the ions and the electrode/electrolyte interface, loosens the binding state of the interface ions, and eliminates the interference of interface polarization on the fading of deep ions; The middle frequency band is corresponding to the relaxation frequency of shallow lattice gap ions, the ions generate reciprocating oscillation under the action of an electric field, and the ions are initially separated from the steric hindrance constraint of the lattice gap and migrate to a quasi-free state; low frequency band, corresponding to relaxation frequency of deep level trap ion, when frequency sweep frequency Equal to the dielectric relaxation frequency of the ions The oscillation amplitude of the ion reaches the peak value and the kinetic energy is enough to break Binding of weak bonds.
  6. 6. The method for controlling all-solid-state electrochromic glass according to claim 1, wherein the step of applying a high-voltage square wave pulse to pump out activated ions to the counter electrode within a preset time period after the end of sweep frequency comprises the following steps: adopting an FPGA programmable logic controller to realize seamless switching of signals; applying unipolar, short-term, high-amplitude voltage pulses to devices The pulse parameters are set as follows: The value rule of the pulse amplitude value: > And is less than a preset percentage of the dielectric breakdown voltage; The value range of the pulse width is within a range of 100 ms-500 ms; The pulse shape adopts square wave pulse.
  7. 7. The method for controlling an all-solid-state electrochromic glass according to claim 6, further comprising performing real-time characterization of effects: during the pulse application process, the optical transmittance of the device can be monitored in real time through a spectrophotometer: In the preset time of pulse application, the transmittance rises at a preset rate, which indicates that ions start to come off from the electrochromic layer; and when the pulse is over, the transmittance rise amplitude is larger than or equal to a preset threshold range, the deep trap ions are effectively extracted, and the residual color is obviously resolved.
  8. 8. The method for controlling all-solid-state electrochromic glass according to claim 1, wherein all power supplies are cut off to allow the device to stand for a preset period of time, a final open-circuit potential is collected after the electrochemical potential is balanced, and the fading effect is judged by comparing the potential differences before and after, specifically comprising: After the pulse is finished, all driving power supplies are immediately cut off, so that the device is in a complete open circuit state, and the device is placed in a constant temperature and humidity non-illumination environment for standing; After the rest is finished, the final open circuit potential of the device is acquired The non-contact resistance of the connection point of the potentiometer and the device is ensured during the acquisition, the acquisition time is not less than the preset time, and the potential average value is taken as the final value ; Presetting the potential difference to reach the threshold value if - And if the potential difference threshold value is not less than, judging that the fading reaches the standard, and ending the flow.
  9. 9. The method for controlling an all-solid-state electrochromic glass according to claim 8, further comprising: Presetting a potential difference basic threshold value, if the potential difference basic threshold value is less than or equal to - If the potential difference reaches the threshold value, judging that the color fading is insufficient, and repeatedly executing the color fading circulation operation; If the potential difference is still smaller than the potential difference basic threshold value after the cyclical fading, the irreversible lattice damage exists in the device.

Description

Control method of all-solid-state organic electrochromic glass Technical Field The invention relates to the technical field of electrochromic devices, in particular to a control method of all-solid-state inorganic electrochromic glass. Background The all-solid-state electrochromic glass has the advantages of low power consumption, high optical contrast, long service life and the like, and is widely applied to the fields of intelligent doors and windows, automobile skylights, display devices and the like. The core working principle is that ions are driven to be embedded/separated between the electrochromic layer and the ion storage layer through an electric field, so that reversible regulation and control of light transmittance are realized. During long-term use, part of ions can be bound in lattice gaps and defect traps of the electrochromic layer to form unbound/weakly bound shallow ions and stably bound deep trap ions. Shallow ions interfere with detection and de-intercalation of deep ions, and deep trap ions cause device residues to fix colors, reduce optical contrast and seriously affect device performance. The traditional color fading method mostly adopts a single constant voltage to drive ion deintercalation, and has the following defects: the shallow ions cannot be accurately removed, and the detection interference of the deep ions is easy to cause; The deep trap ions are difficult to activate, and the fading is not thorough; The long-time high-voltage driving is easy to cause side reactions such as electrolyte decomposition, electrode polarization and the like, so that the device is irreversibly damaged. Accordingly, a control method of an all-solid-state electrochromic glass is proposed to cope with the above-mentioned problems. Disclosure of Invention The invention aims to solve the problems and provides a control method of all-solid-state electrochromic glass. In order to achieve the above purpose, the present invention adopts the following technical scheme: A method for controlling an all-solid-state inorganic electrochromic glass, comprising: Applying constant fading voltage to electrochromic glass, monitoring the current change rate or current density in real time, stopping after reaching the standard, and recording the initial open circuit potential; applying a DC bias to superimpose a composite driving voltage of a sinusoidal alternating current signal of 0.1-0.3V, scanning in a full frequency band according to a logarithmic sweep strategy of 1000Hz to 0.1Hz, and matching relaxation frequencies of trap ions with different depths; Applying high-voltage square wave pulse within a preset time after the sweep is finished, and pumping out activated ions to the counter electrode; Cutting off all power supplies, allowing the device to stand for a preset period of time, collecting a final open-circuit potential after the electrochemical potential is balanced, and judging the fading effect by comparing the potential differences before and after. Preferably, the applying a constant fading voltage to the electrochromic glass, monitoring the current change rate or the current density in real time, stopping after reaching standards, and recording the initial open-circuit potential, which specifically comprises: The method comprises the steps of adopting a direct current power supply as a driving source, connecting a positive electrode of the power supply with a working electrode of electrochromic glass, and connecting a negative electrode of the power supply with a counter electrode; Applying a fade voltage of constant direction and constant magnitude to the device The voltage direction points to the direction that ions are separated from the electrochromic layer; after the voltage is applied, the computer terminal continuously collects and records the real-time working current Simultaneously drawing a current-time curve; At the stop of application After that, the initial open circuit potential of the device is acquired。 Preferably, the method further comprises the step of judging whether the stop condition is required to meet any one of the current change rate threshold value or the current density threshold value at the same time, and specifically comprises the following steps: calculating the adjacent time as Current change rate of two sampling points of (2)When the absolute value of the current change rate of the continuous k sampling points is all satisfied< Preset threshold valueWhen in use; Calculating the real-time current density of the device, and when the absolute values of the current densities of the continuous k sampling points are smaller than the background leakage current threshold value; After which the slave application is recorded The time interval until the judging and stopping conditions are met, namely the total duration of the fading process。 Preferably, the applying the direct current bias to superimpose the composite driving voltage of the sinusoidal alternating current signal o