Lighting device

Abstract

To provide a lighting device capable of suppressing consumption of power supplied from an external power source.SOLUTION: A lighting device disclosed herein comprises a dye-sensitized solar cell 4, a light source unit 2, a storage battery 5, and a lighting control unit 6. The lighting device is configured to perform a charging process for charging the storage battery 5 with power generated by the dye-sensitized solar cell 4, and an emergency lighting process for lighting the light source unit 2 based on the storage battery 5 that has been charged in an emergency when no external power source is supplied.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a lighting device comprising a dye-sensitized solar cell. [Background technology]

[0002] Patent Document 1 discloses a lighting device that is connected to a lamp and includes a unit that includes a storage battery that supplies power to a light source so that the light source can be used as an emergency light for emergency lighting in the event of an emergency when power supply from an external power source is cut off, and a control unit that controls the power supply from the storage battery. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-161504 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned lighting device, since the means for charging the storage battery is solely dependent on an external power source, power consumption becomes an issue.

[0005] In order to solve the above-mentioned problems, an object of the present disclosure is to provide a lighting device that can reduce consumption of power supplied from an external power source. [Means for solving the problem]

[0006] The first aspect of the present disclosure is A dye-sensitized solar cell; A light source unit; A storage battery, A lighting control unit; Equipped with a charging process for charging the storage battery with power generated by the dye-sensitized solar cell; an emergency lighting process for lighting the light source unit based on the storage battery that has been charged in an emergency when no external power source is supplied; Preferably, the lighting device is configured to perform the following:

[0007] In addition, the second aspect is A dye-sensitized solar cell; A light source unit; a storage battery that receives power from the dye-sensitized solar cell and an external power source; A lighting control unit; Equipped with It is preferable that the lighting device is configured to execute a process of lighting the light source unit with a part or all of the power generated by the dye-sensitized solar cell depending on the charge level of the storage battery. Effect of the Invention

[0008] According to the first and second aspects of the present disclosure, it is possible to provide a lighting device that can reduce consumption of power supplied from an external power source. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view of the appearance of a lighting device according to a first embodiment. [Diagram 2] 3 is a diagram showing the arrangement of a light source unit and a dye-sensitized solar cell inside a housing according to the first embodiment. FIG. [Diagram 3] 1 is a block diagram showing a configuration of an illumination device according to a first embodiment. [Figure 4] 4 is a flowchart of a process performed by a charge / discharge control unit according to the first embodiment. [Diagram 5] FIG. 11 is a circuit block diagram showing a configuration of a lighting device according to a second embodiment. [Figure 6] 11 is a flowchart of a process performed by a charge / discharge control unit according to the second embodiment. [Figure 7] FIG. 11 is a circuit block diagram showing a configuration of a lighting device according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An illumination device according to an embodiment of the present disclosure will be described with reference to the drawings. The same or corresponding components are designated by the same reference numerals, and repeated description may be omitted.

[0011] First embodiment FIG. 1 is an external perspective view of a lighting device 100 according to the first embodiment. Here, the lighting device 100 is an emergency light. The lighting device 100 includes a compatible display board 1, a light source unit 2, a housing 3, a dye-sensitized solar cell 4 (not shown), and a storage battery 5 (not shown). The compatible display board 1 is a guide signboard on which a pictogram indicating evacuation guidance is written. The light source unit 2 includes a light source such as an LED or an incandescent lamp, and functions as a backlight for the compatible display board 1. The compatible display board 1 is disposed on a front surface 31 and a back surface 32 of the housing 3. The housing 3 also includes a built-in light source unit 2. The housing 3 is attached to a ceiling or the like via a connection unit 33. This allows the lighting device 100 and an external power source 200 to be electrically connected. That is, in the normal mode, the light source unit 2 can be turned on based on the external power source 200.

[0012] In the present disclosure, a state in which power is being supplied from the external power source 200 is referred to as a normal mode, whereas a state in which power supply from the external power source 200 is cut off is referred to as an emergency mode.

[0013] 2 is a diagram showing the arrangement of a light source unit 2 and a dye-sensitized solar cell 4 inside a housing 3 according to embodiment 1. The light source unit 2 is configured to irradiate light 21 from inside the housing 3 to the outside. Inside the housing 3, the dye-sensitized solar cell 4 is arranged on an inner surface 34 excluding the surface on which the light source unit 2 is arranged and the surface on which the compatible display panel 1 is arranged.

[0014] The dye-sensitized solar cell 4 performs photoelectric conversion by receiving the light 21 emitted by the light source unit 2 and the light from outside the housing 3. Furthermore, the dye-sensitized solar cell 4 charges the storage battery 5 with the power it generates itself. This makes it possible to charge the storage battery 5 while suppressing the use of power from the external power source 200, thereby achieving energy saving.

[0015] In the present disclosure, since the light source unit 2 and the dye-sensitized solar cell 4 are housed inside the housing 3, the light 21 emitted by the light source unit 2 can be efficiently incident on the dye-sensitized solar cell 4, thereby increasing the amount of power generated by the dye-sensitized solar cell 4. Furthermore, by supplying the power generated by the dye-sensitized solar cell 4 based on the light 21 from the light source unit 2 back to the light source unit 2, energy can be circulated within the lighting device 100.

[0016] The configuration of the dye-sensitized solar cell 4 is not limited. However, a solid-type dye-sensitized solar cell 4 that is sensitive to the light 21 emitted by the light source unit 2 and includes a solidified electrolyte is preferable because there is no risk of liquid leakage.

[0017] 3 is a circuit block diagram showing the configuration of the lighting device 100 according to the first embodiment. Note that the circuit in normal mode is shown here. By switching the switch 10, the circuit becomes the emergency mode circuit. Note that the solid arrows indicate the power supply paths, and the dashed arrows indicate the control paths.

[0018] In the normal mode, the dye-sensitized solar cell 4 supplies the power generated by itself to the storage battery 5 via the charge / discharge control unit 7 .

[0019] The charge / discharge control unit 7 includes a charge control unit 71 and a discharge control unit 72. The charge control unit 71 receives power supplied from the dye-sensitized solar cell 4 in normal mode and charges the storage battery 5. The discharge control unit 72 receives power supplied from the storage battery 5 in emergency mode, switches the switch 10 so that the discharge control unit 72 can provide power to the lighting control unit 6, and then supplies the power to the lighting control unit 6.

[0020] The type of switch 10 is not limited as long as it can turn on and off the output from the previous circuit or the input to the next circuit.

[0021] In the normal mode, the storage battery 5 is charged by power supplied from the dye-sensitized solar cell 4 or power supplied from the external power source 200. In the emergency mode, the storage battery 5 supplies power for turning on the light source unit 2 to the lighting control unit 6 via the charge / discharge control unit 7.

[0022] In the normal mode, the lighting control unit 6 lights up the light source unit 2 based on the power supplied from the external power supply 200. On the other hand, in the emergency mode, the lighting control unit 6 lights up the light source unit 2 based on the power from the storage battery 5.

[0023] 4 is a flowchart of the process performed by the charge / discharge control unit 7 according to the first embodiment. First, the process is started. Next, it is determined whether or not the mode is normal (step S01). If it is determined that the mode is normal, the charge control unit 71 continues charging the storage battery 5 from the dye-sensitized solar cell 4 (step S02). On the other hand, if it is determined that the mode is emergency, the discharge control unit 72 supplies power from the storage battery 5 to the lighting control unit 6 (step S03). As a result, in emergency mode, the light source unit 2 can be turned on by the power stored in the storage battery 5.

[0024] As described above, according to the present embodiment, it is possible to provide the lighting device 100 that can charge the storage battery 5 while suppressing consumption of the power supplied from the external power supply 200.

[0025] Embodiment 2 In this embodiment, in the emergency mode, lighting is performed based on the power generated by the dye-sensitized solar cell 4 in addition to the storage battery 5. In the following, changes from the first embodiment will be described.

[0026] 5 is a circuit block diagram showing a configuration of a lighting device 100 according to embodiment 2. Note that the circuit in emergency mode is shown here. By switching the switch 20, the circuit becomes the normal mode circuit. Here, the solid arrows indicate the power supply paths, and the dashed arrows indicate the control paths.

[0027] In the normal mode, the dye-sensitized solar cell 4 supplies the power it generates to the storage battery 5 via the charge control unit 71, as in the first embodiment. On the other hand, in the emergency mode, it supplies the power it generates to the lighting control unit 6 via the discharge control unit 72. This makes it possible to light the light source unit 2 while suppressing the use of the power supplied from the storage battery 5. As a result, in the emergency mode, it becomes possible to light the light source unit 2 for a longer period of time than in the first embodiment.

[0028] In the emergency mode, the discharge control unit 72 switches the switch 20 so that it can provide power to the lighting control unit 6, and then supplies power from the storage battery 5 and the dye-sensitized solar cell 4 to the lighting control unit 6.

[0029] 6 is a flowchart of the process performed by the charge / discharge control unit 7 according to the second embodiment. First, the process is started. Next, it is determined whether or not the mode is normal (step S11). If it is determined that the mode is normal, the charge control unit 71 continues charging the storage battery 5 from the dye-sensitized solar cell 4 (step S12). On the other hand, if it is determined that the mode is emergency, the discharge control unit 72 supplies power from the storage battery 5 and the dye-sensitized solar cell 4 to the lighting control unit 6 to light the light source unit 2 (step S13).

[0030] Third embodiment In this embodiment, a part or all of the power of the dye-sensitized solar cell 4 is used to light the light source unit 2 depending on the charge level of the storage battery 5. In the following, changes from the first embodiment will be described.

[0031] 7 is a circuit block diagram showing a configuration of a lighting device 100 according to embodiment 3. Note that the circuit shown here is in normal mode. By switching the switch 30, the circuit becomes an emergency mode circuit.

[0032] In this embodiment, the dye-sensitized solar cell 4 supplies its own power to the lighting control unit 6 via the generated power control unit 8.

[0033] The generated power control unit 8 receives the power generated by the dye-sensitized solar cell 4. Furthermore, the received power is supplied to at least one of the charging control unit 71 and the lighting control unit 6 according to the charge level of the storage battery 5. For example, when the storage battery 5 does not need to be charged, such as when the storage battery 5 is sufficiently charged, all of the power generated by the dye-sensitized solar cell 4 can be lent to the lighting control unit 6. On the other hand, when the storage battery 5 is not sufficiently charged, a part of the power generated by the dye-sensitized solar cell 4 can be used to charge the storage battery 5, while the remaining power can be lent to the lighting control unit 6. In this way, the present disclosure enables more efficient control of generated power compared to the first embodiment.

[0034] As described above, according to the present disclosure, it is possible to provide a lighting device that can reduce the consumption of power supplied from an external power source.

[0035] The present disclosure is not limited to the above-described embodiment, and various modifications can be made in the implementation stage without departing from the spirit of the present disclosure. In addition, the embodiments may be implemented in appropriate combination, and in that case, the combined effects can be obtained.

[0036] <Variation 1> 1, the lighting device 100 is an emergency light, but the embodiment of the present disclosure is not limited to an emergency light. If the lighting device 100 is an emergency lighting device that includes a dye-sensitized solar cell 4 and a storage battery 5 and turns on the light source unit 2 based on the power generated by the dye-sensitized solar cell 4, it is possible to obtain an effect of suppressing consumption of power supplied from an external power source. This point is common to all the embodiments.

[0037] <Variation 2> In the above, it has been described that the power generated by the dye-sensitized solar cell 4 is used to light the light source unit 2. However, the power generated by the dye-sensitized solar cell 4 may be used for other purposes, such as turning on and off a switch provided in the lighting device 100. Furthermore, the power generated by the dye-sensitized solar cell 4 may be used to operate other devices. For example, in the lighting device 100 installed in a toilet, the power generated by the dye-sensitized solar cell 4 may be used to operate a ventilation fan. This makes it possible to build a system that can utilize the power generated by the dye-sensitized solar cell 4.

[0038] Various aspects of the present disclosure are summarized below as appendices. (Appendix 1) A dye-sensitized solar cell; A light source unit; A storage battery, A lighting control unit; Equipped with a charging process for charging the storage battery with power generated by the dye-sensitized solar cell; an emergency lighting process for lighting the light source unit based on the storage battery that has been charged in an emergency when no external power source is supplied; 13. A lighting device configured to: (Appendix 2) The charging process is performed during normal operation when the external power source is supplied, 2. The lighting device according to claim 1, wherein the emergency lighting process further includes a process of lighting the light source unit based on power generated by the dye-sensitized solar cell. (Appendix 3) A dye-sensitized solar cell; A light source unit; a storage battery that receives power from the dye-sensitized solar cell and an external power source; A lighting control unit; Equipped with The lighting device is configured to execute a process of lighting the light source unit using a part or all of the power generated by the dye-sensitized solar cell depending on a charge level of the storage battery. (Appendix 4) The dye-sensitized solar cell and the light source unit are further provided with a housing. The light source unit is configured to irradiate light from inside to outside the housing, 4. The lighting device according to claim 1, wherein the dye-sensitized solar cell receives light emitted by the light source unit inside the housing and generates electricity. (Appendix 5) Connected to other devices, 5. The lighting device according to claim 1, further comprising a process of operating the other device using power generated by the dye-sensitized solar cell. [Explanation of symbols]

[0039] 1 Compliant display panel, 2 Light source unit, 3 Housing, 4 Dye-sensitized solar cell, 5 Storage battery, 6 Lighting control unit, 7 Charge / discharge control unit, 8 Generated power control unit, 10 Switch, 20 Switch, 21 Light, 30 Switch, 31 Surface, 32 Rear, 33 Connection unit, 34 Inner surface, 71 Charge control unit, 72 Discharge control unit, 100 Lighting device, 200 External power supply

Claims

1. A dye-sensitized solar cell; A light source unit; A storage battery, A lighting control unit; Equipped with a charging process for charging the storage battery with power generated by the dye-sensitized solar cell; an emergency lighting process for lighting the light source unit based on the storage battery that has been charged in an emergency when no external power source is supplied; 13. A lighting device configured to:

2. The charging process is performed during normal operation when the external power source is supplied, The lighting device according to claim 1 , wherein the emergency lighting process further includes a process of lighting the light source unit based on power generated by the dye-sensitized solar cell.

3. A dye-sensitized solar cell; A light source unit; a storage battery that receives power from the dye-sensitized solar cell and an external power source; A lighting control unit; Equipped with The lighting device is configured to execute a process of lighting the light source unit using a part or all of the power generated by the dye-sensitized solar cell depending on a charge level of the storage battery.

4. The dye-sensitized solar cell and the light source unit are further provided with a housing. The light source unit is configured to irradiate light from inside to outside the housing, The lighting device according to claim 1 , wherein the dye-sensitized solar cell receives light emitted by the light source unit inside the housing and generates power.

5. Connected to other devices, The lighting device according to claim 1 , further comprising a process for operating the other device using power generated by the dye-sensitized solar cell.

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