KR20120045915A - Smart window apparatus - Google Patents

Abstract

PURPOSE: A smart window device is provided to simplify a power supply system by omitting a separate power supply device. CONSTITUTION: A solar battery(110) converts solar light into DC(Direct Current) power. A power converting unit(120) converts the DC power into driving power. An electrochromic device(200) changes a color by the driving power. An input unit(150) generates a first input signal for controlling the power converting unit. A control unit(160) applies the driving power to the electrochromic device according to the first input signal which is controlled by the power converting unit.

Description

Smart window apparatus

The present invention relates to a smart window device, and more particularly to a smart window device that can use sunlight as a driving power source.

Recently, the glass industry wants to produce better quality materials by changing the properties of existing glass based on energy savings and the use of eco-friendly materials. In addition, as the necessity of glass manufacturing that can artificially control the transmittance of visible light is emerging, a new material glass called a smart window is attracting attention.

An electrochromic device (ECD) is a device whose color changes due to the flow of electric current when an electric field is applied, and is an ultraviolet, visible or near-infrared light due to electron transfer accompanying an electrochemical oxidation / reduction reaction. The color may change according to the change of energy absorption in the region.

The smart window applying the electrochromic device to the window allows the sunlight and solar heat to be introduced into the room as much as possible in the winter, and can block the summer to adjust the indoor temperature, thereby saving energy.

However, in order to drive such a smart window, a separate external power must be supplied, and the power supply system may be complicated.

An object of the present invention to provide a smart window device that can use sunlight as a drive power.

In addition, the present invention provides a smart window device that can adjust the amount of sunlight and solar heat transmission.

Smart window device according to an embodiment of the present invention for achieving the above object, the solar cell converts sunlight into direct current power, the power conversion unit for converting direct current power to the drive power, the color according to the application of the driving power An electrochromic device unit to be changed, an input unit for generating a first input signal for controlling the operation of the power converter, and a controller for controlling the power converter to apply driving power to the electrochromic device according to the first input signal, The color changing element part includes a first substrate having a first light transmitting electrode, a second substrate facing the first substrate and provided with a second light transmitting electrode, and an electrochromic device between the first light transmitting electrode and the second light transmitting electrode. The battery may be located on the side of the electrochromic device between the first substrate and the second substrate.

In addition, at least one of the first light transmitting electrode and the second light transmitting electrode may be patterned.

In addition, in the patterning, at least one of the first and second translucent electrodes may be divided into several sub-electrodes, and driving power may be individually applied to the divided sub-electrodes.

The input unit may generate a second input signal for individually applying driving power to several sub-electrodes, and the controller may control the electrochromic device unit according to the second input signal.

In addition, the electrochromic device may include an ion storage layer, an ion conductive layer on the ion storage layer, and an electrochromic layer on the ion conductive layer.

The controller may control the power converter to apply the driving power to the electrochromic device when the size of the DC power is larger than the preset value.

The apparatus may further include a light detector configured to measure the intensity of sunlight and supply it to the controller, wherein the controller may control the power converter to apply driving power according to the intensity of sunlight.

In addition, the electrochromic device unit may be divided into several regions in which the driving power is independently applied, and the controller may control the electrochromic device so that the driving power is individually or simultaneously applied to the several regions according to the intensity of sunlight.

The apparatus may further include a charging / discharging unit that charges the DC power and supplies the charged charging power to the power conversion unit, and a switching unit that switches the DC power to the charging / discharging unit or the power conversion unit.

According to the present invention, the power supply system structure can be simplified by using sunlight as a driving power source and omitting a separate external power supply device.

In addition, it is possible to adjust the amount of sunlight and solar heat transmission.

1 is a block diagram of a smart window device according to an embodiment of the present invention;
2 is a perspective view of the smart window device of FIG.
3 is a cross-sectional view showing a section AA ′ of the smart window device of FIG. 2;
4 is an exploded perspective view of an electrochromic device included in the smart window device of FIG. 1;
5 is a view illustrating a method of driving an electrochromic device included in the smart window device of FIG. 1;
6 is a block diagram of a smart window device according to an embodiment of the present invention;
7 and 8 are circuit diagrams showing an example of a power conversion unit included in a smart window device according to an embodiment of the present invention;
9 is a block diagram of a smart window device according to an embodiment of the present invention.

In the following drawings, "on" or "under" of each component includes both "directly" or "indirectly" through other components, each of which is formed Criteria for the top or bottom of the component will be described with reference to the drawings. In addition, each component is exaggerated, omitted or schematically illustrated for convenience and clarity of description, the size of each component does not reflect the actual size entirely.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

1 is a block diagram of a smart window device according to an embodiment of the present invention, Figure 2 is a perspective view showing the smart window device of Figure 1, Figure 3 is a cross-sectional view showing a cross-section AA 'of the smart window device of FIG. 4 is an exploded perspective view of an electrochromic device unit included in the smart window device of FIG. 1, and FIG. 5 is a view illustrating a method of driving the electrochromic device unit included in the smart window device of FIG. 1.

First, referring to FIGS. 1 to 3, the smart window device 100 of the present invention includes a solar cell 110 that converts sunlight into a direct current power source, and a power conversion unit 120 that converts a direct current power source into a driving power source. In order to control the operation of the smart window device 100 according to an input signal, the electrochromic device unit 200 whose color is changed according to the application of the driving power, the input signal may be transmitted to the controller 160 and the controller 160. It may include an input unit 150 that can be.

The solar cell 110 converts light energy into electrical energy using a photovoltaic effect. The solar cell 110 may be any one of a silicon solar cell, a thin film solar cell, a dye-sensitized solar cell, and an organic polymer solar cell. It may be, but is not limited thereto. On the other hand, the solar cell 110, in the form of a module, may be implemented in at least one module.

The power converter 120 may convert the DC power produced by the solar cell 110 into driving power and supply the converted power to the electrochromic device 200. The power conversion unit 120 may include a converter or / and an inverter according to the type of power that the electrochromic device unit 200 operates. The converter and the inverter will be described later with reference to FIGS. 7 and 8.

The electrochromic device unit 200 may change the color according to the application of the driving power, thereby controlling the inflow of sunlight and solar heat into the room.

In the electrochromic device 200, the first substrate 210 including the first transmissive electrode 220 and the second substrate 230 provided with the second transmissive electrode 240 face each other at a predetermined interval. An electrochromic device 250 may be positioned between the first light transmitting electrode 220 and the second light transmitting electrode 240.

The first substrate 210 and the second substrate 230 may be made of a transparent material such as glass, polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polystyrene, polyepoxy furnace, but is not limited thereto.

The first and second transmissive electrodes 220 and 240 are formed of ITO, IZO (In-ZnO), GZO (Ga-ZnO), AZO (Al-ZnO), AGZO (Al-Ga ZnO), IGZO (In -Ga ZnO), IrOx, RuOx, RuOx / ITO, Ni / IrOx / Au and Ni / IrOx / Au / ITO, but may be formed to include at least one of, but is not limited thereto.

The electrochromic device 250 includes an ion storage layer 255, an ion conductive layer 253, and an electrochromic layer 251, and the first light transmitting electrode 220 and the second light transmitting electrode 240 when the driving power is applied. An electric field is formed between the two layers, and oxidation and reduction reactions occur between the ion storage layer 255, the ion conductive layer 253, and the electrochromic layer 251, thereby reversibly changing the color of the electrochromic layer 251. Can be.

The ion storage layer 255 may be an ion storage material such as titanium oxide or an oxidation or reduction colored material to store a plurality of cations such as hydrogen ions and lithium ions as a layer for accumulating ions.

The ion conductive layer 253 may be formed of, for example, poly-2-acrylamide-2-methylpropane sulfonate, polystyrene sulfonate, polyethylene sulfonic acid ( It may further include an ion conductive polymer alone or an electrolyte salt, including, but not limited to, poly-ethylene sulfonate), poly-vinyl sulfonate, and copolymers thereof and copolymers of various monomers.

When the electrochromic layer 251 is applied with an electric field, the amount of light is increased to decrease the light transmittance. When the electrochromic layer 251 is removed, the light transmittance is reversibly increased. The electrochromic layer 251 may include a metal oxide, an oxidized mixed metal, a low molecular organic material, a conjugated polymer, and the like, and may include a material such as Prussian blue in which coloration or discoloration occurs due to an applied current. can do.

The metal oxide may include tungsten oxide (WO 3), manganese oxide (MgO 3), titanium oxide (TiO 3), or the like, and the oxide mixed metal may be vanadium (V), molybdenum (Mo), niobium (Nb), or titanium ( Ti), nickel (Ni), cobalt (Co), iridium (Ir), and the like, and the low molecular weight organic material may include methyl viologen, heptyl viologen, and the like. In addition, the conjugated polymer (conjugated polymer) may include polypyrrole (polyoyrrole), polyaniline (polyaniline), polythiophene (polythiophene) and the like. However, the present invention is not limited thereto.

Meanwhile, according to the present invention, the solar cell 110 may be positioned on the side of the electrochromic device 250 between the first substrate 210 and the second substrate 240 of the electrochromic device unit 200 described above. have. As such, as the solar cell 110 is located on the side of the electrochromic device 250, a separate external power supply may be omitted using solar light as a driving power, and the power supply system structure may be simplified. have. 2 and 3 illustrate that the solar cell 110 is formed only on one side of the electrochromic device 250, but is not limited thereto. The solar cell 110 may be formed on a part of the electrochromic device part 200 or on an entire outer circumferential part thereof. have.

The input unit 150 may transmit a first input signal for controlling the operation of the power conversion unit 120 to the controller 160, and convert the power by the control of the controller 160 according to the application of the first input signal. As the unit 120 applies the driving power to the electrochromic device unit 200, the smart window device 100 may start an operation. In this case, when the first input signal is input once more, the supply of driving power may be stopped.

Accordingly, the smart window device 100 according to the present invention can control the indoor temperature by preventing excessive sunlight and solar heat from entering the room during the summer or day time, thereby saving energy.

On the other hand, the smart window device 100 according to the present invention, at least one portion may be operated when the driving power is applied to adjust the amount of light transmission.

4 is an exploded perspective view of the electrochromic device unit 200, in which the first substrate 210 is omitted, and the first light transmitting electrode 220 is separated and illustrated. FIG. 5 is a view of the first light transmitting electrode 220. 4 and 5, the electrochromic device unit 200 may be formed by patterning at least one of the first light transmitting electrode 220 and the second light transmitting electrode 240. The driving power source may be divided into several regions to which the driving power is independently applied.

For example, as illustrated in FIG. 4, the first translucent electrode 220 may be divided into several sub electrodes 221 ˜ 226, and the several sub electrodes 221 ˜ 226 may be insulated from each other.

At this time, as shown in Fig. 5 (a), the + terminal (p) and the-terminal (m) is individually connected to the several sub-electrodes (221 ~ 226), the driving power may be applied simultaneously, or applied independently May be

For example, when a driving power is applied only to the second sub-electrode 222, an electric field is formed only between the second sub-electrode 222 and the second translucent electrode 240, and thus the electrochromic device 250 is formed of The color may change only in an area where the second sub-electrode 222 is positioned to partially block sunlight and solar heat.

Meanwhile, in FIG. 5B, the + stage p and the-stage m are individually connected to several sub-electrodes 221 to 226, but the + stage p and the-stage m are mutually connected. The example connected in the other direction is shown. As such, when the + stage p and the-stage m are connected in different directions, the power supply structure for supplying the driving power can be further simplified.

FIG. 5C illustrates that the first to third sub electrodes 221 to 223 are bundled with a common terminal. That is, the first to third sub-electrodes 221 to 223 are grouped to simultaneously apply driving power, and the fourth to sixth sub-electrodes 224 to 226 may be independently operated by applying driving power separately. .

In addition, in the case of (c), as shown in (d), the + stage (p) and the-stage (m) are connected in different directions to simplify the power supply structure.

The selective application of the driving power to the plurality of sub-electrodes 221 ˜ 226 may be controlled by the controller 160 according to the second input signal of the input unit 150. That is, the controller 160 may control the operation of the electrochromic device 200 according to the second input signal.

Accordingly, the input unit 150 transmits an input signal according to the input stage to the control unit 160, and the control unit 160 accordingly operates the smart window device 100, the power conversion unit 140, and the electrochromic device unit. The operation of 200 may be controlled.

Meanwhile, at least one of the first substrate 210 and the second substrate 230 may have a specific color. Accordingly, when driving power is applied to the electrochromic device unit 200, the light passing through the electrochromic device unit 200 may transmit only light having a specific wavelength among visible light passing therethrough.

6 is a block diagram of a smart window device according to an embodiment of the present invention, Figures 7 and 8 are circuit diagrams showing an example of a power conversion unit included in the smart window device.

Referring to FIG. 6, the smart window device 400 of the present invention includes a solar cell 405 that converts sunlight into a DC power source, a power converter 410 that converts DC power into a drive power, and an application of driving power. The control unit 450 for controlling the operation of the power conversion unit 410 and the electrochromic device unit 440 to apply the electrochromic device unit 440 and the driving power to the electrochromic device unit 440 is changed color accordingly; It may include.

Since the solar cell 405 and the electrochromic device unit 440 are the same as the solar cell 110 and the electrochromic device unit 200 shown and described with reference to FIGS. 1 to 5, description thereof will be omitted.

The power conversion unit 410 may convert the DC power produced by the solar cell 405 into driving power to supply the electrochromic device unit 440.

The power conversion unit 410 may include a converter or / and an inverter depending on the type of power that the electrochromic device unit 440 operates.

FIG. 7 is a circuit diagram illustrating an example of the power converter 410, and is a circuit diagram when the dc / dc converter 420 is included. Referring to FIG. 7, the dc / dc converter 420 outputs a level change of the DC power supplied from the solar cell 405. For example, the DC power generated by the solar cell 405 may be boosted and output.

To this end, the dc / dc converter 420 may include a switched mode power supply (SMPS) 422, and as shown in the figure, one-way conduction of direct current power from the solar cell 405. Diode element (D1) for the, the capacitor (C1) for storing the DC power from the solar cell 405, the capacitor (C2) for storing the DC power converted and output from the switching mode power supply 422, and the converted The device may further include a diode device D2 for connecting the DC power in one direction, and a switching device SW3 connected to the switching mode power supply 422 to perform a switching operation.

Such a dc / dc converter 420 may be included in the power conversion unit 140 shown and described in FIG.

Meanwhile, the input voltage detector A may detect the DC power supply Vd1 input from the solar cell 405 and transmit it to the controller 450. Accordingly, the control unit 450 compares the size of the DC power supply Vd1 supplied from the solar cell 405 with a preset value, and supplies the power conversion unit 410 to supply driving power to the electrochromic device unit 440. Can be controlled. The input voltage detector A may be included in the dc / dc converter 420 and may be configured to be included in the controller 450.

8 is a circuit diagram illustrating an example of a power conversion unit, and is a circuit diagram when the inverter 430 is included. The inverter 430 includes a plurality of inverter switching elements, and converts the DC power supply Vdc of the dc terminal capacitor Cdc into an AC power source having a predetermined frequency and a predetermined size by an on / off operation of the switching device. The electrochromic device unit 440 may output the same.

Such an inverter 430 may be included in the power converter 140 shown and described with reference to FIG. 1.

On the other hand, the input voltage detecting unit (D) for detecting the DC power input from the solar cell 405 transmits the magnitude of the DC power input from the solar cell 405 to the control unit 450, the control unit 450, The power conversion unit 410 may be controlled to supply driving power to the electrochromic device unit 440 by comparing the size of the DC power supplied from the solar cell 405 with a preset value.

The above-described converter 420 and inverter 430 may be included in the power conversion unit 410 at the same time. That is, when the electrochromic device unit 440 operates as an AC power source, the DC power produced by the solar cell 405 is boosted by the converter 420, and the boosted DC power is converted into a predetermined frequency by the inverter 430. It may be converted into AC power having a predetermined size and supplied to the electrochromic device unit 440.

As described above, the controller 450 detects the magnitude of the DC power generated by the solar cell 405 by the input voltage detectors A and D, and controls the operation of the power converter 410 accordingly. can do.

That is, when the size of the DC power generated by the solar cell 405 is larger than the preset value, the electrochromic device unit 440 by supplying the driving power from the power conversion unit 410 to the electrochromic device unit 440. It can be controlled to block the sunlight and solar heat, if the size of the DC power generated by the solar cell 405 is smaller than the preset value, the power conversion unit to stop the supply of driving power to the electrochromic device unit 440 410 may be controlled.

On the other hand, the smart window device 400 according to an embodiment of the present invention may further include a light detecting unit 460 for detecting the intensity of sunlight. The light detector 460 measures the intensity of sunlight and supplies it to the controller 450. Accordingly, the controller 450 applies the power to the driving power according to the intensity of the sunlight measured by the light detector 460. 410 may be controlled.

For example, the electrochromic device unit 440 may be divided into several regions that can be driven independently, and the controller 450 may be configured according to the intensity of sunlight measured by the light detector 460 or the input unit 470. By controlling the operation of the electrochromic device unit 440 according to the second input signal of the, the driving power can be applied to several areas individually or simultaneously.

That is, as described with reference to FIGS. 5 and 6, at least one of the first transmissive electrode (not shown) and the second transmissive electrode (not shown) of the electrochromic device unit 440 may be formed by several sub-electrodes (patterns). The sub-electrode (not shown) may be divided into power sources, and driving power may be applied simultaneously or separately. Therefore, by changing the light transmittance of the electrochromic device unit 440 according to the intensity of sunlight, it is possible to control the incident light into the room.

On the other hand, the input unit 470 transmits an input signal according to the input step to the control unit 450, the control unit 450 according to the operation of the smart window device 400, the power conversion unit 410 and the electrochromic device unit The operation of 440 may be controlled.

9 is a block diagram of a smart window device according to an embodiment of the present invention.

Referring to FIG. 9, the smart window device 800 of the present invention includes a solar cell 805, a power converter 825, an electrochromic device unit 830, and a controller 810 for converting sunlight into DC power. It may further include a charging and discharging unit 820, and a switching unit 815 for switching to apply DC power to the charging and discharging unit 820 or the power converter 825.

Since the solar cell 805, the power converter 825, and the electrochromic device unit 830 are the same as those illustrated in FIGS. 1 to 8, detailed description thereof will be omitted.

The switching unit 815 switches to apply the DC power produced by the solar cell 805 to the charging / discharging unit 820 or the power conversion unit 825 under the control of the controller 810, and the charging / discharging unit 820 is the sun. The DC power produced by the battery 805 may be charged, and the charged charging power may be supplied to the power converter 825. As the charge / discharge unit 820, a secondary battery or an electric double layer capacitor may be used.

Referring to FIG. 9, the operation of the smart window device 800 according to an embodiment of the present invention will be described. First, when the size of the DC power produced by the solar cell 805 is larger than a preset value, the controller 810 The switching unit 815 is controlled to apply DC power to the charge / discharge unit 820. In addition, the charging and discharging unit 820 is controlled to stop the supply of the charging power to the power conversion unit 825.

Meanwhile, the third input signal of the input unit 840 for switching of the switching unit 815 is transmitted to the control unit 810, whereby the control unit 810 switches the solar cell 805 by switching of the switching unit 815. The switching unit 815 may be controlled to apply the DC power produced by the power supply to the power conversion unit 825. At the same time, when the third input signal is applied to the input unit 840, the control unit 810 converts the DC power into driving power and applies the power conversion unit (830) to the electrochromic device unit 830. 825 can be controlled.

As a result, when the size of the DC power produced by the solar cell 805 is larger than the preset value and the driving power is not applied to the electrochromic device unit 830, the third input signal of the input unit 840 is applied. The driving power may be applied to the electrochromic device unit 830. The third input signal may be re-input to the controller 810, where the controller 810 is switched so that the DC power generated by the solar cell 805 is applied to the charge / discharge unit 820 again. The switching unit 815 may be controlled to make it possible. In addition, the DC power produced by the solar cell 805 may be applied to the charge / discharge unit 820 and the power converter 825 at the same time. In this case, the charging and discharging unit 820 may be charged while preventing the inflow of sunlight into the interior.

On the other hand, when the size of the DC power produced by the solar cell 805 is smaller than the preset value, the control unit 810, the charging and discharging unit 825 to apply the charging power of the charging and discharging unit 820 to the power conversion unit 825. The power conversion unit 825 may control the power conversion unit 825 to convert the charging power into the driving power and to apply the electrochromic device unit 830.

As a result, the solar cell 805 receives daylight sunlight to produce a direct current power source, and stores the direct current power source in the charging / discharging unit 820 to be used as the power of the smart window device 800 at night. That is, the night time zone can prevent the indoor landscape from being exposed to the outside by using the stored charging current of the charging / discharging unit 820.

Meanwhile, as illustrated and described with reference to FIGS. 5 and 6, the electrochromic device unit 830 may be divided into several regions that can be driven independently, and the controller 810 is generated from the solar cell 805. The size of the DC power source may be sensed and thus the operation of the electrochromic device unit 830 may be controlled according to the second input signal of the input unit 840. Thereby, the driving power can be applied to several regions sequentially or simultaneously.

Therefore, the input signal of the input unit 840 transmits the input signal according to the input step to the control unit 810, the control unit 810 according to the operation of the smart window device 800, the switching unit 815, charging The operation of the unit 820, the power conversion unit 825, and the electrochromic device unit 830 may be controlled.

As a result, the smart window device 800 according to the present invention uses the sunlight as a driving power source, the power supply system structure can be simplified, and automatically adjusts light transmission according to the DC power generated from the solar cell 805. Can be.

The smart window device according to the embodiment is not limited to the configuration of the embodiments described as described above, but the embodiments are configured by selectively combining all or some of the embodiments so that various modifications can be made. May be

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

110, 405, 805: solar cell 120, 410, 825: power conversion unit
150, 470, 840: input unit 160, 450, 810: control unit
200, 440, 830: electrochromic device portion 460: light detector
815: switching unit 820: charging and discharging unit

Claims (15)

A solar cell converting sunlight into a direct current power source;
A power converter converting the DC power into driving power;
An electrochromic device unit whose color is changed according to the application of the driving power;
An input unit generating a first input signal for controlling an operation of the power conversion unit; And
And a controller configured to control the power converter to apply the driving power to the electrochromic device according to the first input signal.
The electrochromic device unit includes a first substrate including a first light transmitting electrode, a second substrate facing the first substrate and provided with a second light transmitting electrode, and an electrochromic device between the first light transmitting electrode and the second light transmitting electrode. Includes, The solar cell is a smart window device located on the side of the electrochromic device between the first substrate and the second substrate. The method of claim 1,
At least one of the first light transmitting electrode and the second light transmitting electrode is a patterned smart window device. The method of claim 2,
The patterning divides at least one of the first light transmitting electrode and the second light transmitting electrode into several sub-electrodes, and the driving power is individually applied to the divided sub-electrodes. The method of claim 3,
The input unit generates a second input signal for separately applying the driving power to the several sub-electrodes,
The controller controls the electrochromic device according to the second input signal. The method of claim 1,
The electrochromic device comprises a ion storage layer, an ion conducting layer on the ion storage layer and a smart window device comprising an electrochromic layer on the ion conductive layer. The method of claim 1,
The control unit,
The smart window device for controlling the power conversion unit to apply the driving power to the electrochromic device when the size of the DC power is larger than a predetermined value. The method of claim 6,
And a light detector for measuring the intensity of the sunlight and supplying the light to the controller.
The control unit, the smart window device for controlling the power conversion unit to apply the driving power in accordance with the intensity of the sunlight. The method of claim 7, wherein
The electrochromic device portion is partitioned into several regions to which the driving power is independently applied.
The controller may control the electrochromic device so that the driving power is individually or simultaneously applied to the several areas according to the intensity of the sunlight. The method of claim 1,
A charging and discharging unit which charges the DC power and supplies the charged charging power to the power conversion unit;
And a switching unit for switching the DC power to the charging / discharging unit or the power conversion unit. 10. The method of claim 9,
When the magnitude of the DC power is larger than the preset value, the control unit,
The switching unit is controlled to apply the DC power to the charging and discharging unit,
Smart window device for controlling the charging and discharging unit to stop the supply of the charging power to the power conversion unit. The method of claim 10,
The input unit transmits a third input signal for switching the switching unit to the control unit,
The control unit,
When the third input signal is applied, the smart window device for switching the switch unit to apply the DC power to the power conversion unit. The method of claim 11,
The smart window device controls the power converter to apply the driving power to the electrochromic device when the third input signal is applied. 10. The method of claim 9,
When the magnitude of the DC power supply is smaller than the preset value,
The control unit controls the charging and discharging unit to apply the charging power to the power conversion unit,
The power conversion unit converts the charging power to the driving power, the control unit is a smart window device for controlling the power conversion unit to apply the driving power to the electrochromic device. The method of claim 1,
Power conversion unit smart window device including a converter and / and an inverter. The method of claim 1,
The solar cell is any one of a silicon solar cell, a thin film solar cell, a dye-sensitized solar cell and an organic polymer solar cell.

Images