CN115064138B - Electrochromic device driving system and method based on NFC - Google Patents

Abstract

The invention provides an NFC-based electrochromic device driving system and method, comprising an electrochromic device, a transmitting device and a driving device, wherein the electrochromic device is electrically connected with the driving device, the transmitting device is in communication connection with the driving device, the transmitting device comprises a reader-writer, the driving device comprises an NFC electronic tag and a signal conditioning circuit, the NFC electronic tag is matched with the reader-writer, the signal conditioning circuit is electrically connected with the driving device, and the first control circuit and the second control circuit are used for jointly acting to ensure that the intelligent control of the working state of the electrochromic device is realized.

Description

An electrochromic device driving system and method based on NFC

Technical Field

The present invention relates to the technical field of electrochromic devices, and in particular to an NFC-based electrochromic device driving system and method.

Background technique

Electrochromism refers to the phenomenon that the optical properties of a material undergo stable and reversible changes under the action of electrical stimulation, which visually manifests as a reversible change in color or transparency. The emerging bistable electrochromic display has a good memory effect. After a short low-voltage stimulation, it can maintain the coloring/fading state for a long time, greatly reducing the power consumption of the screen display and has a wide range of application scenarios.

However, in practical applications, the problem of switching the display state of the electrochromic device is usually solved by manually switching the voltage direction. For usage scenarios where the display state of the electrochromic device needs to be frequently switched, manual operation is relatively cumbersome.

Summary of the invention

The problem solved by the present invention is how to intelligently switch the working state of an electrochromic device.

To solve the above problems, the present invention provides an NFC-based electrochromic device driving system, including an electrochromic device, a transmitting device and a driving device, wherein the driving device is electrically connected to the electrochromic device, the transmitting device is communicatively connected to the driving device, the transmitting device includes a first control circuit, a signal generating circuit, a power amplifying circuit and a reader/writer antenna circuit, and the driving device includes a tag antenna circuit, an NFC electronic tag, a second control circuit and a signal conditioning circuit.

Optionally, the driving device further includes a sensor, and the sensor is electrically connected to the second control circuit.

Optionally, the driving device includes a driving circuit, which includes a receiving coil, a rectifier circuit, a first electrolytic capacitor and a first resistor, wherein the positive end of the first electrolytic capacitor is electrically connected to the rectifier circuit and the negative end is grounded for stabilizing the circuit voltage, and one end of the first resistor is electrically connected to the rectifier circuit and the other end is grounded for acting as a circuit load.

Optionally, the driving circuit also includes a common-collector amplifier circuit, which includes a bipolar transistor, a second resistor, and a third resistor. The collector of the bipolar transistor is electrically connected to the power supply of the driving device, the base is connected to the output end of the driving circuit, the emitter is electrically connected to one end of the electrochromic device, one end of the second resistor is electrically connected to the emitter, the other end of the second resistor is grounded, and the third resistor is electrically connected to the base and the collector, respectively.

Optionally, the rectifier circuit includes a bridge rectifier circuit, a half-wave rectifier circuit or a voltage doubling rectifier circuit; when the rectifier circuit is the bridge rectifier circuit, the input end of the bridge rectifier circuit is electrically connected to the receiving coil, and the output end is electrically connected to the positive end of the first electrolytic capacitor, wherein the bridge rectifier circuit is composed of four rectifier diodes connected end to end; when the rectifier circuit is the half-wave rectifier circuit, the input end of the half-wave rectifier circuit is electrically connected to the receiving coil, and the output end is electrically connected to the first electrolytic capacitor and the first resistor, wherein the half The wave rectification circuit includes at least one rectification diode; when the rectification circuit is the voltage doubling rectification circuit, the rectification circuit includes a second electrolytic capacitor, a third electrolytic capacitor, a first diode and a second diode, wherein the positive end of the second electrolytic capacitor is electrically connected to the receiving coil, the negative end of the second electrolytic capacitor is electrically connected to the anode of the first diode and the cathode of the second diode, the positive end of the third electrolytic capacitor is electrically connected to the cathode of the first diode, and the negative end is electrically connected to the anode of the second diode, and the first resistor serves as a load of the driving circuit.

Optionally, the reader antenna circuit includes a reader antenna coil, the tag antenna circuit includes a tag antenna coil, and the reader antenna coil and the tag antenna coil are made of copper wire etched on a PCB board or a circuit printed by a conductive material on a flexible substrate.

Compared with the prior art, the present invention combines a driving circuit, an NFC electronic tag and an electrochromic device, and completes the reading and processing judgment of instructions through a first control circuit arranged in a transmitting device and a first control circuit arranged in a driving device, and then completes the control of the electrochromic device according to a preset strategy, thereby ensuring the function of intelligently switching the working state of the electrochromic device according to instructions.

On the other hand, the present invention also provides a method for driving an electrochromic device based on an emitter, comprising:

A transmitting device obtains a first driving instruction issued by a computer network system; the first driving instruction is modulated to obtain a first driving signal, and is emitted outward in the form of an electromagnetic wave; the transmitting device receives a feedback signal, demodulates the feedback signal, obtains a feedback instruction, and sends the feedback instruction to a first control circuit in the transmitting device; the first control circuit obtains a second driving instruction based on the feedback signal, modulates the second driving instruction to obtain a second driving signal, and emits the second driving signal outward in the form of an electromagnetic wave, and the second driving signal is used to control the second control circuit to drive the electrochromic device.

Compared with the prior art, the present invention processes and determines control instructions through the first control circuit and the second control circuit, and then drives the electrochromic device based on the instruction content to control the electrochromic device to change color, fade or stop the current operation; the second control circuit can also generate a feedback signal, which is processed and judged by the first control circuit to determine whether the first control instruction needs to be modified, thereby ensuring the realization of intelligent control of the electrochromic device.

In a third aspect, the present invention further provides an electrochromic device driving method based on an NFC electronic tag, comprising:

Optionally, when the driving device enters the communication range of the transmitting device, a first driving signal is received through the tag antenna, the first driving signal is demodulated to obtain a first driving instruction; the first driving instruction is processed by the second control circuit to obtain instruction content, and the electrochromic device is driven based on the instruction content.

Optionally, the step of processing the first driving instruction by a second control circuit to obtain instruction content, and driving the electrochromic device by the instruction content includes:

Obtaining sensor information; determining whether the sensor information satisfies the driving conditions of the instruction content, wherein the driving conditions include a threshold value of the sensor information for driving the electrochromic device; if satisfied, controlling the electrochromic device based on the instruction content through the second control circuit, wherein the instruction content includes controlling the electrochromic device to change color, fade, or stop working.

Optionally, after controlling the electrochromic device based on the instruction content by the second control circuit, the method further includes:

Determine whether the driving signal generated by the second control circuit matches the driving voltage of the electrochromic device; if the driving signal does not match the driving voltage, control the signal conditioning circuit through the second control circuit to perform voltage regulation on the driving signal.

The beneficial effects of the electrochromic device driving method based on NFC electronic tags over the prior art are the same as those of the electrochromic device driving method based on a transmitter, and will not be described in detail here.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a system schematic diagram of an NFC-based electrochromic device driving system according to an embodiment of the present invention;

FIG2 is a driving circuit diagram of an NFC-based electrochromic device driving system according to an embodiment of the present invention;

FIG3 is another driving circuit diagram of the NFC-based electrochromic device driving system according to an embodiment of the present invention;

FIG4 is a third driving circuit diagram of the NFC-based electrochromic device driving system according to an embodiment of the present invention;

FIG5 is a fourth driving circuit diagram of the NFC-based electrochromic device driving system according to an embodiment of the present invention;

6 is a schematic flow chart of a method for driving an electrochromic device based on a transmitter according to an embodiment of the present invention;

7 is a schematic flow chart of a method for driving an electrochromic device based on an NFC electronic tag according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a detailed flow chart of step S600 of the method for driving an electrochromic device based on an NFC electronic tag according to an embodiment of the present invention.

Detailed ways

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and/or in parallel. In addition, the method embodiments may include additional steps and/or omit the steps shown. The scope of the present invention is not limited in this respect.

The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". Relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

Existing wirelessly driven electrochromic devices use a wired power supply, with the receiving end supplying power to the receiving device or supplying power to the battery of the receiving device. This method uses 220V AC power for power supply, which means that the receiving device must control the electrochromic device through a charging circuit and an energy storage capacitor, making the receiving end of the electrochromic device larger in size. This method can only transmit energy but not information, and requires the addition of an additional communication device, which further increases the size of the circuit, thereby limiting the application of electrochromic devices and having a greater impact on miniaturized application scenarios.

As shown in Figure 1, an embodiment of the present invention provides an NFC-based electrochromic device driving system, including an electrochromic device, a transmitting device and a driving device, wherein the driving device is electrically connected to the electrochromic device, the transmitting device is communicatively connected to the driving device, the transmitting device includes a first control circuit, a signal generating circuit, a power amplifying circuit and a reader/writer antenna circuit, and the driving device includes an NFC electronic tag, a second control circuit, a signal conditioning circuit and a tag antenna circuit.

NFC (Near Field Communication) is an emerging short-range high-frequency wireless communication technology that operates at a frequency of 13.56MHz and its working distance is generally within 10 cm.

In the NFC system, the reader and the tag communicate with each other. According to the principle of electromagnetic induction, the exchange of data and energy between the tag and the reader is realized through the inductive coupling between electromagnetic waves. When the magnetic flux passing through the closed circuit changes, an induced current will be generated in the closed circuit. Therefore, when the alternating current passes through the antenna coil of the reader, alternating magnetic lines of force will be generated inside and around the coil, and an induced voltage will be generated at both ends of the coil, causing inductive coupling and thus generating an induced current. Therefore, the electrochromic device is integrated with the NFC electronic tag, and energy is obtained when the coil is coupled to generate an induced potential and current to drive the electrochromic device to switch states.

In this embodiment, the transmitting device includes a first control circuit, a signal generating circuit, a power amplifier circuit and a reader/writer antenna circuit. The first control circuit can process and judge instructions with certain control logic, and then modulate the instructions into a 13.56MHz sinusoidal signal generated by a crystal oscillator through the signal generating circuit, and transmit the signal through the antenna driving circuit in the reader/writer antenna circuit and the reader/writer antenna.

In one embodiment, the power amplifier circuit is used to gain the signal transmitted by the reader antenna, and is used to power the driving circuit or provide energy driving when the driving circuit is insufficient to drive the electrochromic device.

In this embodiment, the driving device includes an NFC electronic tag, a second control circuit, a signal conditioning circuit and a tag antenna circuit. When the driving device enters the signal range of the reader, the electromagnetic signal emitted by the reader is received by the tag antenna circuit, then demodulated by the radio frequency front-end circuit, and transmitted to the second control circuit, which processes the instruction and drives the electrochromic device according to the instruction content.

In one embodiment, after the electromagnetic signal emitted by the reader is received by the tag antenna circuit, a part of the signal is rectified, filtered, and stabilized by the rectification and filtering circuit and then converted into direct current to power the driving circuit.

In one embodiment, the signal conditioning circuit includes a power amplifier circuit, which is used to convert the control instructions transmitted from the control circuit into the driving voltage signal required by the electrochromic device. When the driving voltage signal is insufficient to drive the electrochromic device, the driving voltage signal is amplified by the power amplifier circuit to ensure driving of the electrochromic device.

Optionally, the driving device further includes a sensor, and the sensor is electrically connected to the second control circuit.

In one embodiment, the sensor acquires information, and then processes and judges it through the second control circuit, and controls the electrochromic device to change color, fade, or stop the current operation based on the sensing information acquired by the sensor. The instructions processed by the first control circuit and the second control circuit include control instructions for the sensor and judgment of the sensing information.

Optionally, the sensor includes various sensors such as temperature sensor, humidity sensor, light sensor, thermal sensor, pressure sensor, etc.

In one embodiment, when the sensor obtains the external temperature and transmits it to the control circuit in the second control circuit, when the temperature obtained by the sensor exceeds a preset threshold, the control circuit controls the electrochromic device to change color. When the temperature obtained by the sensor does not exceed the preset threshold, the electrochromic device is controlled according to a preset strategy.

Optionally, as shown in Figure 2, the driving device includes a driving circuit, which includes a receiving coil, a rectifier circuit, a first electrolytic capacitor and a first resistor, wherein the positive end of the first electrolytic capacitor is electrically connected to the rectifier circuit and the negative end is grounded for stabilizing the circuit voltage, and one end of the first resistor is electrically connected to the rectifier circuit and the other end is grounded for acting as a circuit load.

In one embodiment, AC is the AC signal source of the transmitting device, and U1 represents the power amplifier of the transmitting device, which plays the role of amplifying current and following voltage. T1 is a transmitting coil and a receiving coil represented by mutually coupled inductances. D1, D2, D3 and D4 constitute a rectifier bridge of the drive circuit to rectify the induced AC signal generated by the receiving coil. C1 is a large-capacity electrolytic capacitor, which is used to filter the rectified signal, remove the pulsating component in the signal, and store electrical energy to stabilize the voltage in the drive circuit. Resistor R1 acts as a circuit load to adjust the output capacity of the circuit. The output end of the drive circuit is electrically connected to the electrochromic device ECD (Electrochomic Device) to drive the electrochromic device to change color and fade.

Optionally, as shown in Figure 3, the driving circuit also includes a common-collector amplifier circuit, which includes a bipolar transistor, a second resistor, and a third resistor. The collector of the bipolar transistor is electrically connected to the power supply of the driving device, the base is connected to the output end of the driving circuit, the emitter is electrically connected to one end of the electrochromic device, one end of the second resistor is electrically connected to the emitter, the other end of the second resistor is grounded, and the third resistor is electrically connected to the base and the collector, respectively.

In one embodiment, when the output voltage of the driving circuit is insufficient to drive the electrochromic device to change color, a common collector amplifier circuit composed of a bipolar transistor Q1 is added between the output terminal of the driving circuit and the electrochromic device ECD to amplify the current in the circuit and improve the output power of the circuit. As shown in FIG3 , Q1 is an NPN bipolar transistor, the collector of Q1 is electrically connected to the power supply VCC, VCC is used to power the driving circuit, the base is electrically connected to the output terminal of the driving circuit, and there is a resistor R3 with a relatively large resistance between the collector and the base. The emitter is connected to one end of the electrochromic device as the output terminal of the driving circuit, and the other end is grounded. The common collector amplifier circuit composed of the NPN bipolar transistor Q1 ensures that the driving circuit has sufficient driving voltage to meet the requirements of the electrochromic device ECD.

In another embodiment, a PNP bipolar transistor may be used instead of the NPN bipolar transistor in the above embodiment.

Optionally, as shown in FIGS. 2 to 5 , the rectifier circuit includes a bridge rectifier circuit, a half-wave rectifier circuit or a voltage doubler rectifier circuit;

When the rectifier circuit is the bridge rectifier circuit, the input end of the bridge rectifier circuit is electrically connected to the receiving coil, and the output end is electrically connected to the positive end of the first electrolytic capacitor, wherein the bridge rectifier circuit is composed of four rectifier diodes connected end to end.

As shown in FIG. 2 and FIG. 3 , the rectifier circuit is a rectifier bridge, which is connected to the output end of the receiving coil to ensure that the AC signal sensed by the receiving coil is rectified.

When the rectifier circuit is the half-wave rectifier circuit, the input end of the half-wave rectifier circuit is electrically connected to the receiving coil, and the output end is electrically connected to the first electrolytic capacitor and the first resistor respectively, wherein the half-wave rectifier circuit includes at least one rectifier diode.

As shown in Figure 4, the half-wave rectifier diode D5 is connected to the driving circuit as a rectifier circuit. The anode of the half-wave rectifier diode D5 is electrically connected to the output end of the receiving coil. The forward conduction and reverse cutoff characteristics of the diode are utilized to retain the positive part of the coil induction signal. After being stabilized by the first electrolytic capacitor C1, a stable DC voltage is output to drive the electrochromic device ECD.

When the rectifier circuit is the voltage doubling rectifier circuit, the rectifier circuit includes a second electrolytic capacitor, a third electrolytic capacitor, a first diode and a second diode, wherein the positive end of the second electrolytic capacitor is electrically connected to the receiving coil, the negative end of the second electrolytic capacitor is electrically connected to the anode of the first diode and the cathode of the second diode, the positive end of the third electrolytic capacitor is electrically connected to the cathode of the first diode, and the negative end is electrically connected to the anode of the second diode, and the first resistor serves as a load of the drive circuit.

When the output voltage of the driving circuit, that is, the driving voltage is less than the driving voltage required by the electrochromic device, the driving circuit shown in Figure 5 is used for driving. Among them, the rectifier circuit includes a rectifier diode D6 and a rectifier diode D7, a second electrolytic capacitor C2 and a third electrolytic capacitor C3. In the positive half cycle of the receiving coil induction AC signal, the rectifier diode D6 is forward-conducted, the rectifier diode D7 is reverse-cut off, and the second electrolytic capacitor C2 is charged by the rectifier diode D6 until the voltage across the second electrolytic capacitor C2 is close to the peak value of the induced electromotive force; in the negative half cycle of the AC signal, the rectifier diode D6 is reverse-cut off, the rectifier diode D7 is forward-conducted, and the third electrolytic capacitor C3 is charged by the rectifier diode D6 until the voltage across the third electrolytic capacitor C3 is close to the sum of the voltage across the second electrolytic capacitor C2 and the peak value of the induced electromotive force. Because the load resistor R1 is a resistor with a large resistance value, the voltage across the load resistor R1 is close to twice the peak value of the induced electromotive force, so that the driving voltage output to the electrochromic device ECD meets the requirements of the electrochromic device ECD.

In one embodiment, the electrochromic device is a single-layer device, in which a solution containing an electrochromic functional layer material is applied by a scraper or a wire rod onto a transparent substrate covered with a conductive material (such as ITO, indium tin oxide), and the solution is left to stand for 2-3 minutes. After the accelerator evaporates, the solution is bonded to another transparent substrate with a conductive material.

Optionally, the reader antenna circuit includes a reader antenna coil, and the tag antenna circuit includes a tag antenna coil. The coil diameters of the reader antenna coil and the tag antenna coil are less than or equal to 3 cm, and the number of turns is less than or equal to 10 turns. The reader antenna coil and the tag antenna coil are made of copper wire etched on a PCB board or a circuit printed by a conductive material on a flexible substrate.

In one embodiment, the reader antenna and the tag antenna use a planar circular spiral coil structure, and may also use a planar spiral square coil structure. The coil size and number of turns of the reader antenna and the tag antenna can be adjusted according to the actual needs of the circuit, so that the center frequency of the coil is maintained between 10-18MHz, and then the coil is tuned to 13.56MHz by connecting capacitors in series/parallel at both ends of the coil. When the obtained coil meets the conditions of working in NFC near-field communication, the wireless driving circuit using the coil can not only transfer energy but also interact with the transmitting circuit. The reduced volume of the electrochromic device driving circuit provides the possibility of intelligently controlling the switching of any state of the electrochromic device.

In one embodiment, the transmitting device includes a communication circuit for transmitting instructions between the host computer and the first control circuit composed of a microcontroller, an NFC reader/writer chip and its peripheral circuits, and the transmitting device also includes a radio frequency transceiver circuit, an antenna drive circuit, a crystal oscillator, a power supply circuit and a reader/writer antenna. The drive circuit includes a radio frequency front-end circuit composed of an impedance matching circuit and a modulation and demodulation circuit, a second control circuit, and a signal conditioning circuit.

When the tag is a passive tag, the driving circuit converts part of the energy received by the receiving coil into direct current as the power supply of the driving circuit, and the driving circuit does not include a power circuit; when the tag is an active/semi-active tag, the driving circuit needs to actively communicate with the transmitting device, so the driving circuit includes a power circuit.

In one embodiment, the receiving coil is placed directly below the transmitter coil, that is, the position where the coil undergoes inductive coupling to obtain maximum transmission efficiency. Under the action of the alternating magnetic field, the receiving coil induces an induced electromotive force, which further generates an induced current to obtain an AC signal. After being rectified by a diode, a pulsating DC signal with a positive amplitude is obtained, and the pulsating component is then filtered out by an electrolytic capacitor with a larger capacitance to obtain a relatively stable DC signal.

Use a multimeter or oscilloscope to measure the size of the DC voltage signal to determine whether it reaches the turn-on voltage of the driven electrochromic device. If the condition is met, the electrochromic device is driven to change color. If not, the output power of the driving circuit is increased.

Optionally, the output power of the drive circuit is increased in four ways, including:

A common collector power amplifier circuit composed of bipolar transistors is added to the output of the rear stage of the driving circuit;

Change the turns ratio of the transmitting coil to the receiving coil and increase the voltage/current of the driving circuit;

Increasing the amplitude of the AC signal generated by the signal generating circuit in the transmitting device;

Improve the amplification gain of the power amplifier circuit in the transmitting circuit.

Another embodiment of the present invention provides a transmitter-based electrochromic device driving method, which is applied to the above-mentioned NFC-based electrochromic device driving system. The NFC-based electrochromic device driving method includes:

Step S100: The transmitting device obtains a first driving instruction issued by the computer network system.

Step S200: modulate the first driving instruction to obtain a first driving signal, and emit it outward in the form of electromagnetic waves.

In step S300, the transmitting device receives a feedback signal, demodulates the feedback signal, obtains a feedback instruction, and sends the feedback instruction to a first control circuit in the transmitting device.

Step S400, the first control circuit obtains a second drive instruction based on the feedback signal, modulates the second drive instruction to obtain a second drive signal, and emits the second drive signal outward in the form of an electromagnetic wave, and the second drive signal is used to control the second control circuit to drive the electrochromic device.

In one embodiment, a first drive instruction is issued by a computer network system (PC or other host computer), wherein the first drive instruction is an electrical signal. The first drive instruction is processed and judged by the first control circuit in the transmitting device. Then the instruction is modulated to the base frequency of 13.56MHz generated by the crystal oscillator to obtain a first drive signal, and the first drive signal is transmitted outward in the form of electromagnetic waves through the antenna. After receiving the drive signal and a series of processing, a feedback signal is sent to the transmitting device, and the content contained in the feedback signal includes one or more of identity information, feedback information, sensor information, fault information or drive information related to the electrochromic device. After receiving the feedback signal, the signal is demodulated to obtain a feedback instruction, which is transmitted to the first control circuit and processed and judged by the first control circuit. The first control circuit generates a second drive signal according to the received feedback instruction, and transmits the second drive signal in the same way to control the electrochromic device to change color, fade or stop controlling the electrochromic device.

In one embodiment, the driving device transmits a feedback signal about the sensing data. After the first control circuit obtains the feedback signal, it determines whether it is necessary to control the electrochromic device/or change the control strategy of the first driving instruction based on the sensing data, and then sends a second driving signal to control the driving device and the electrochromic device.

In other embodiments, the first control circuit determines whether the control strategy of the first driving instruction needs to be changed based on a feedback signal containing other information.

Another embodiment of the present invention provides an electrochromic device driving method based on an NFC electronic tag, which is applied to the above-mentioned electrochromic device driving system based on NFC. The electrochromic device driving method based on an NFC electronic tag includes:

Step S500: When the driving device enters the communication range of the transmitting device, a first driving signal is received through the tag antenna, and the first driving signal is demodulated to obtain a first driving instruction.

Step S600: Processing the first driving instruction by a second control circuit to obtain instruction content, and driving the electrochromic device based on the instruction content.

After the tag antenna in the driving device obtains the induced electromotive force, the first driving signal is demodulated by the RF front-end circuit, and then the demodulated first driving instruction is transmitted to the second control circuit. The second control circuit processes and judges, obtains the instruction content, and controls the driving circuit to drive the electrochromic device based on the instruction content to make it change color, fade or stop working.

In one embodiment, after the second control circuit obtains the instruction content, the instruction and information are stored in the memory, and a driving voltage signal corresponding to the instruction is generated to drive the electrochromic device.

When the tag is a passive tag, there is no power supply in the driving device. When the tag antenna enters the communication range of the transmitting device, part of the signal is demodulated by the RF front-end circuit, and the other part of the signal is converted into DC power after rectification, filtering and voltage stabilization to power the driving circuit.

Optionally, after receiving the first control signal, the second control circuit processes and determines, and then generates a feedback signal, which is fed back to the transmitting device through the tag antenna. The feedback signal includes environmental information of the driving device, sensor information, fault information, control information related to the electrochromic device, and other information.

Optionally, step S600 includes:

Step S601, obtaining sensor information.

Step S602, determining whether the sensing information satisfies the driving condition of the instruction content, wherein the driving condition includes a threshold of the sensing information for driving the electrochromic device.

Step S603: If the conditions are met, the electrochromic device is controlled based on the instruction content through the second control circuit, wherein the instruction content includes controlling the electrochromic device to change color, fade, or stop working.

The sensing information is obtained through the sensor, and the control strategy for the electrochromic device is obtained based on the sensing information. In one embodiment, the temperature information is obtained through the temperature sensor, and after the temperature information exceeds the temperature threshold, the electrochromic device needs to change color to perform a temperature warning. Its workflow includes setting the temperature threshold of the system through the host computer, and after the temperature exceeds the temperature threshold, the electrochromic device has a color change warning, and the first control instruction including the temperature threshold is transmitted to the first control circuit for processing and judgment, and then the signal is modulated and transmitted through the antenna, received by the driving device, and then demodulated by the RF front-end circuit to obtain the first control signal, and the first control signal is processed and judged by the second control circuit to obtain the instruction content, and then the temperature sensor is controlled to monitor the temperature. When the temperature exceeds the preset threshold, a driving voltage is generated based on the instruction content and transmitted to both ends of the electrochromic device to cause a color change warning.

Optionally, after step S603, the method further includes:

Step S604, determining whether the driving signal generated by the second control circuit matches the driving voltage of the electrochromic device.

Step S605: If the driving signal does not match the driving voltage, the signal conditioning circuit is controlled by the second control circuit to perform voltage regulation on the driving signal.

In one embodiment, it is necessary to consider the situation where the driving signal is too low/or the driving voltage required by the electrochromic device is too high. Therefore, after the second control circuit generates a driving signal to control the electrochromic device in step S603, it is determined whether the electrochromic device can be driven smoothly. If it cannot be driven, that is, the driving signal and the driving voltage do not match, the voltage is adjusted by the signal conditioning circuit to smoothly drive the electrochromic device.

Another embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the above-mentioned transmitter-based electrochromic device driving method and NFC electronic tag-based electrochromic device driving method are implemented.

An electronic device that can be used as a server or client of the present invention will now be described, which is an example of a hardware device that can be applied to various aspects of the present invention. Electronic devices are intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic devices can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples, and are not intended to limit the implementation of the present invention described and/or required herein.

The electronic device includes a computing unit, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) or a computer program loaded from a storage unit into a random access memory (RAM). In the RAM, various programs and data required for the operation of the device can also be stored. The computing unit, ROM, and RAM are connected to each other via a bus. An input/output (I/O) interface is also connected to the bus.

A computer system may include clients and servers. Clients and servers are generally remote from each other and usually interact through a communication network. The relationship of client and server is generated by computer programs running on respective computers and having a client-server relationship to each other.

A person of ordinary skill in the art can understand that the implementation of all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc. In the present application, the unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment of the present invention. In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims (7)

1. A method for driving an electrochromic device based on an NFC electronic tag, characterized in that it is applied to an electrochromic device driving system based on NFC, comprising an electrochromic device, a transmitting device and a driving device, wherein the driving device is electrically connected to the electrochromic device, the transmitting device is communicatively connected to the driving device, the transmitting device comprises a first control circuit, a signal generating circuit, a power amplifying circuit and a reader/writer antenna circuit, the driving device comprises a tag antenna circuit, an NFC electronic tag, a second control circuit and a signal conditioning circuit; the reader/writer antenna circuit comprises a reader/writer antenna coil, the tag antenna circuit comprises a tag antenna coil, the reader/writer antenna coil and the tag antenna coil are made of copper wire etched on a PCB board or a circuit printed by a conductor material on a flexible substrate, and the method for driving an electrochromic device based on an NFC electronic tag comprises: When the driving device enters the communication range of the transmitting device, the first driving signal is received through the tag antenna, the first driving signal is demodulated, and a first driving instruction is obtained; The first driving instruction is processed by the second control circuit to obtain instruction content, and the electrochromic device is driven based on the instruction content, including: obtaining sensor information; judging whether the sensor information meets the driving conditions of the instruction content, wherein the driving conditions include a threshold value of the sensor information for driving the electrochromic device; if satisfied, controlling the electrochromic device based on the instruction content through the second control circuit, wherein the instruction content includes controlling the electrochromic device to change color, fade or stop working. 2. The method for driving an electrochromic device based on an NFC electronic tag according to claim 1, characterized in that the driving device further comprises a sensor, and the sensor is electrically connected to the second control circuit. 3. According to the NFC electronic tag-based electrochromic device driving method of claim 1, it is characterized in that the driving device also includes a driving circuit, the driving circuit includes a receiving coil, a rectifier circuit, a first electrolytic capacitor and a first resistor, wherein the positive end of the first electrolytic capacitor is electrically connected to the rectifier circuit, and the negative end is grounded for stabilizing the circuit voltage, and one end of the first resistor is electrically connected to the rectifier circuit, and the other end is grounded for acting as a circuit load. 4. According to the NFC electronic tag-based electrochromic device driving method of claim 3, it is characterized in that the driving circuit also includes a common collector amplifier circuit, the common collector amplifier circuit includes a bipolar transistor, a second resistor and a third resistor, the collector of the bipolar transistor is electrically connected to the power supply of the driving device, the base is connected to the output end of the driving circuit, the emitter is electrically connected to one end of the electrochromic device, one end of the second resistor is electrically connected to the emitter, the other end of the second resistor is grounded, and the third resistor is electrically connected to the base and the collector, respectively. 5. The electrochromic device driving method based on NFC electronic tag according to claim 3, characterized in that the rectifier circuit comprises a bridge rectifier circuit, a half-wave rectifier circuit or a voltage doubler rectifier circuit; When the rectifier circuit is the bridge rectifier circuit, the input end of the bridge rectifier circuit is electrically connected to the receiving coil, and the output end is electrically connected to the positive end of the first electrolytic capacitor, wherein the bridge rectifier circuit is composed of four rectifier diodes connected end to end; When the rectifier circuit is the half-wave rectifier circuit, the input end of the half-wave rectifier circuit is electrically connected to the receiving coil, and the output end is electrically connected to the first electrolytic capacitor and the first resistor respectively, wherein the half-wave rectifier circuit includes at least one rectifier diode; When the rectifier circuit is the voltage doubling rectifier circuit, the rectifier circuit includes a second electrolytic capacitor, a third electrolytic capacitor, a first diode and a second diode, wherein the positive end of the second electrolytic capacitor is electrically connected to the receiving coil, the negative end of the second electrolytic capacitor is electrically connected to the anode of the first diode and the cathode of the second diode, the positive end of the third electrolytic capacitor is electrically connected to the cathode of the first diode, and the negative end is electrically connected to the anode of the second diode, and the first resistor serves as a load of the drive circuit. 6. The method for driving an electrochromic device based on an NFC electronic tag according to claim 1, characterized in that after the electrochromic device is controlled based on the instruction content by the second control circuit, it further comprises: Determining whether the driving signal generated by the second control circuit matches the driving voltage of the electrochromic device; If the driving signal does not match the driving voltage, the signal conditioning circuit is controlled by the second control circuit to perform voltage regulation on the driving signal. 7. A transmitter-based electrochromic device driving method, characterized in that it is applied to an NFC-based electrochromic device driving system, comprising an electrochromic device, a transmitter and a driver, wherein the driver is electrically connected to the electrochromic device, the transmitter is communicatively connected to the driver, the transmitter comprises a first control circuit, a signal generating circuit, a power amplifier circuit and a reader antenna circuit, the driver comprises a tag antenna circuit, an NFC electronic tag, a second control circuit and a signal conditioning circuit; the reader antenna circuit comprises a reader antenna coil, the tag antenna circuit comprises a tag antenna coil, the reader antenna coil and the tag antenna coil are made of copper wire etched on a PCB board or a circuit printed by a conductor material on a flexible substrate, and the NFC-based electrochromic device driving method comprises: The transmitting device obtains a first driving instruction issued by the computer network system; Modulating the first driving instruction to obtain a first driving signal, and emitting the first driving signal in the form of an electromagnetic wave; The transmitting device receives the feedback signal, demodulates the feedback signal, obtains a feedback instruction, and sends the feedback instruction to the first control circuit in the transmitting device; The first control circuit obtains a second drive instruction based on the feedback signal, modulates the second drive instruction to obtain a second drive signal, and emits the second drive signal outward in the form of an electromagnetic wave. The second drive signal is used to control the second control circuit to drive the electrochromic device.