WO2011016463A1 - Solar-cell-equipped charger - Google Patents

Abstract

Disclosed is a solar-cell-equipped charger that charges efficiently while using a dye-sensitized solar cell. The disclosed solar-cell-equipped charger (1) is provided with: a dye-sensitized solar cell (10) having a light-entrance surface (14); a battery holder (50) that holds at least part of a secondary battery (55); a charging circuit (60) that charges the secondary battery (55); and a chassis (30) that contains the dye-sensitized solar cell (10), the battery holder (50), and the charging circuit (60). The charging circuit (60) has a heat-producing component. Looking at the charging circuit (60) from a direction perpendicular to the light-entrance surface (14), the heat-producing component in the charging circuit (60) is arranged alongside the dye-sensitized solar cell (10), and at least some of the components in the charging circuit other than the heat-producing component are arranged so as to overlap the dye-sensitized solar cell (10), both towards the light-entrance surface with respect to the dye-sensitized solar cell (10) and on the opposite side.

Description

Charger with solar battery

The present invention relates to a charger with a solar cell, and more particularly to a charger with a solar cell using a dye-sensitized solar cell as a solar cell.

With the spread of portable electronic devices such as mobile phones and digital cameras, chargers for charging secondary batteries used in these electronic devices have become widespread. As this charger, in addition to a charger that uses electric power obtained from a household power source, a solar cell is provided, and a charger that charges a secondary battery using electric power generated in this solar cell is known. It has been.

The following Patent Document 1 describes a charger equipped with such a solar cell. In the charger described in Patent Document 1 below, a solar battery, a secondary battery charged with electric power generated by the solar battery, a charging circuit for charging the secondary battery, a solar battery, and a secondary battery And a housing in which a charging circuit is housed and a window portion on which a light incident surface of the solar cell is exposed is formed on the front surface. And each space where the solar cell and charging circuit in a housing | casing are arrange | positioned is formed adjacent to the direction parallel to the incident surface of the light of a solar cell (patent document 1).

Japanese Utility Model Publication No. 06-029348

As described above, in the charger described in Patent Document 1, each space in which the solar cell and the charging circuit are arranged is formed adjacent to a direction parallel to the light incident surface of the solar cell. Therefore, the space in which the charging circuit is arranged becomes an obstacle, and there is a problem that the area of the incident surface of the solar cell cannot be sufficiently increased and the secondary battery cannot be charged efficiently. Therefore, in order to increase the area of the incident surface of the solar cell, it is conceivable to arrange the charging circuit on the back side of the solar cell.

By the way, in recent years, a dye-sensitized solar cell having advantages such as high photoelectric conversion efficiency and low manufacturing cost has attracted attention. And there exists a request to apply the dye-sensitized solar cell which has such an advantage to the charger with a solar cell. However, photosensitizing dyes and electrolytes used in dye-sensitized solar cells are more susceptible to thermal damage than crystalline solar cells using silicon or the like. Therefore, when the charging circuit is arranged on the back side of the dye-sensitized solar cell in order to increase the area of the incident surface of the solar cell as described above, the dye-sensitized type is formed by heat generated from the charging circuit during charging. There is a problem that the solar cell may be damaged.

Therefore, an object of the present invention is to provide a solar cell-equipped charger that performs efficient charging while using a dye-sensitized solar cell.

The charger with solar cell of the present invention includes a dye-sensitized solar cell having a light incident surface, a charging circuit that is electrically connected to the dye-sensitized solar cell and charges a secondary battery, and A case that houses a dye-sensitized solar cell and the charging circuit, and the charging circuit includes a heat-generating component, and the charging circuit is viewed along a direction perpendicular to the incident surface. The exothermic component of the charging circuit is arranged side by side with the dye-sensitized solar cell, and at least a part other than the exothermic component is the incident surface of the dye-sensitized solar cell. It is arranged to overlap with the dye-sensitized solar cell on the side opposite to the side.

According to such a charger with a solar cell, the energy of light incident from the light incident surface in the dye-sensitized solar cell is converted into electric power, and this electric power is charged into the secondary battery by the charging circuit. At this time, the heat generating components in the charging circuit generate heat. However, this heat-generating component is generated alongside the dye-sensitized solar cell when viewed from the charging circuit along the direction perpendicular to the incident surface of the dye-sensitized solar cell. Can be prevented from being transmitted to the dye-sensitized solar cell, and damage to the dye-sensitized solar cell can be suppressed. Furthermore, at least a part of the components other than the heat-generating component of the charging circuit is disposed so as to overlap the dye-sensitized solar cell on the side opposite to the incident surface side of the dye-sensitized solar cell. Therefore, the area occupied by the portion arranged side by side with the dye-sensitized solar cell in the charging circuit is reduced by the area of the component arranged overlapping the dye-sensitized solar cell. Thereby, the area of the incident surface of the dye-sensitized solar cell can be increased, and the light incident surface of the dye-sensitized solar cell can be greatly exposed. Thus, efficient charging can be performed.

The exothermic component in the charging circuit means a semiconductor or coil that generates heat when a voltage that is stepped up or down is applied from the dye-sensitized solar cell. That is, it means a semiconductor or coil such as a switch or a transistor for adjusting the voltage, and does not mean a semiconductor or coil for control.

Furthermore, in the above-mentioned charger with solar power, the charging circuit includes a constant voltage circuit, and the constant voltage circuit has the dye-sensitized solar when the charging circuit is viewed along a direction perpendicular to the incident surface. It may be arranged side by side with the battery. This constant voltage circuit includes both a step-up circuit and a step-down circuit whose output voltage is constant.

Moreover, in the charger with a solar cell, a part of the charging circuit is composed of an IC (IntegratedcuCircuit) including the heat-generating component, and the IC extends along a direction perpendicular to the incident surface. When viewing the charging circuit, it may be arranged alongside the dye-sensitized solar cell.

The solar battery charger further includes a battery holder that houses at least a part of the secondary battery, and the heat-generating component is viewed when the charging circuit is viewed along a direction perpendicular to the incident surface. The battery holder is preferably arranged so as not to overlap the battery holder.

Such a battery charger with a solar battery can suppress the heat generated from the heat generating component from being transmitted to the secondary battery. Therefore, it can suppress that the charging efficiency of a secondary battery falls with a heat | fever, and more efficient charge can be performed.

Furthermore, in the charger with solar battery, it is preferable that the battery holder further includes a battery casing that covers at least a part of the secondary battery.

According to such a battery charger with a solar battery, even when a part of heat is transmitted from the heat-generating component to the battery holder, the battery case covering at least a part of the secondary battery can be used for the secondary battery. It is possible to further suppress the transmission of heat.

In the charger with solar cell, the dye-sensitized solar cell is preferably a single cell type dye-sensitized solar cell.

According to such a battery charger with a solar cell, a connection conductor for connecting cells and a sealing part for sealing the cell and the connection conductor are unnecessary, and the dye-sensitized solar cell is thinned. Can be formed. Therefore, heat is easily released from the dye-sensitized solar cell. Thus, the dye-sensitized solar cell can be further suppressed from being damaged by heat.

According to the present invention, a battery charger with a solar cell that performs efficient charging while using a dye-sensitized solar cell is provided.

It is a front view which shows the charger with a solar cell which concerns on 1st Embodiment of this invention. It is a figure which shows sectional drawing of the dye-sensitized solar cell shown in FIG. It is a circuit diagram which shows the charging circuit shown in FIG. It is a side view of the charger with a solar cell shown in FIG. It is another side view of the charger with a solar cell shown in FIG. It is a figure which shows arrangement | positioning of each circuit in the charging circuit shown in FIG. It is a figure which shows the use condition of the charger with a solar cell shown in FIG. It is a figure which shows the charger with a solar cell which concerns on 2nd Embodiment of this invention. It is a figure which shows the charger with a solar cell which concerns on 3rd Embodiment of this invention. It is a circuit diagram which shows the charging circuit of the charger with a solar cell which concerns on 4th Embodiment of this invention.

Hereinafter, preferred embodiments of a battery charger with a solar cell according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a plan view showing a solar cell-equipped charger according to the first embodiment of the present invention.

As shown in FIG. 1, the solar cell charger of the present embodiment charges the dye-sensitized solar cell 10, the battery holder 50 that houses at least a part of the secondary battery 55, and the secondary battery 55. A charging circuit 60 to be performed, and a case 30 that houses the dye-sensitized solar cell 10, the battery holder 50, and the charging circuit 60 are provided.

First, the dye-sensitized solar cell 10 will be described.

FIG. 2 is a cross-sectional view of the dye-sensitized solar cell 10 shown in FIG. As shown in FIG. 2, the dye-sensitized solar cell 10 includes a working electrode 15, a current collector wiring 16 provided on the working electrode 15, a counter electrode 20 facing the working electrode 15, a working electrode 15, and a counter electrode 20. The main component is an electrolyte 18 disposed between the electrodes 18 and a sealing portion 23 that surrounds and seals the electrolyte 18 between the working electrode 15 and the counter electrode 20.

The working electrode 15 is provided on the surface of the transparent substrate 11, the transparent conductor 12 provided on one surface of the transparent substrate 11, and the surface opposite to the transparent substrate 11 side of the transparent conductor 12. A plurality of semiconductor layers 13 that carry dye-sensitive materials are provided.

The transparent substrate 11 is composed of a substrate made of a light transmissive material. Examples of such materials include glass, polyethylene terephthalate (PET), polycarbonate (PC), polyethersulfone (PES), polyethylene naphthalate (PEN), and are usually used as a transparent substrate for photoelectric conversion elements. Any material can be used. And the transparent base material 11 is suitably selected in consideration of the tolerance to an electrolyte among these. The transparent substrate 11 has a light incident surface 14 on the surface opposite to the surface on which the transparent conductor 12 is formed. Therefore, the transparent substrate 11 is preferably a substrate that is as excellent in light transmission as possible, and more preferably a substrate having a light transmittance of 90% or more.

The transparent conductor 12 is composed of a transparent conductive film, and is formed on a part or the entire surface of one side of the transparent substrate 11. The transparent conductor 12 is preferably a thin film made of a conductive metal oxide so that the transparency of the working electrode 15 is not significantly impaired. Examples of such conductive metal oxides include indium tin oxide (ITO), fluorine-added tin oxide (FTO), and tin oxide (SnO ₂ ). The transparent conductor 12 may be a single layer or a laminate of a plurality of layers made of different conductive metal oxides. When the transparent conductor 12 is composed of a single layer, the transparent conductor 12 is preferably ITO or FTO from the viewpoint of easy film formation and low manufacturing cost, and has high heat resistance and chemical resistance. From the viewpoint of having, it is more preferable that it is composed of FTO.

As shown in FIG. 1, the plurality of semiconductor layers 13 formed on the transparent conductor 12 are each formed in a rectangular shape and arranged so as to be arranged at a predetermined interval. The semiconductor layer 13 is composed of a porous oxide semiconductor. Such an oxide semiconductor is not particularly limited as long as it is usually used for forming a semiconductor layer for a photoelectric conversion element. Anything can be used. Examples of such an oxide semiconductor include titanium oxide (TiO ₂ ), tin oxide (SnO ₂ ), tungsten oxide (WO ₃ ), zinc oxide (ZnO), niobium oxide (Nb ₂ O ₅ ), and strontium titanate. (SrTiO ₃ ) indium oxide (In ₃ O ₃ ), zirconium oxide (ZrO ₂ ), thallium oxide (Ta ₂ O ₅ ), lanthanum oxide (La ₂ O ₃ ), yttrium oxide (Y ₂ O ₃ ), holmium oxide ( Ho ₂ O ₃ ), bismuth oxide (Bi ₂ O ₃ ), cerium oxide (CeO ₂ ), aluminum oxide (Al ₂ O ₃ ), and an oxide semiconductor composed of two or more of these. good.

Examples of the photosensitizing dye supported on the surface of the semiconductor layer 13 include a ruthenium complex containing a bipyridine structure or a terpyridine structure as a ligand, a metal-containing complex such as porphyrin or phthalocyanine, an organic dye such as eosin, rhodamine or merocyanine. Among these, those exhibiting behavior suitable for the intended use and the semiconductor used can be selected without particular limitation. Specifically, N3, N719, N749, etc. can be used.

The electrolyte 18 is formed by impregnating the semiconductor layer 13 with an electrolytic solution, or after impregnating the semiconductor layer 13 with the electrolytic solution, the electrolytic solution is gelled (pseudo-) using an appropriate gelling agent. Solidified and formed integrally with the semiconductor layer 13, or a gel electrolyte containing an ionic liquid, oxide semiconductor particles, or conductive particles can be used.

As the electrolytic solution used for such an electrolyte 18, an electrolytic solution in which an electrolyte component such as iodine, iodide ion, or tertiary-butylpyridine is dissolved in an organic solvent such as ethylene carbonate or methoxyacetonitrile is used. Examples of the gelling agent used for gelling the electrolytic solution include polyvinylidene fluoride, a polyethylene oxide derivative, and an amino acid derivative.

The current collector wiring 16 provided on the working electrode 15 extends from the region surrounded by the inner periphery of the sealing portion 23 to the outside of the outer periphery of the sealing portion 23 as shown in FIG. 12 is provided on the surface opposite to the transparent substrate 11 side. At least a part of the current collecting wiring 16 is a terminal 21 outside the outer periphery of the sealing portion 23. Further, the current collecting wiring 16 is provided between the plurality of semiconductor layers 13 in a region surrounded by the inner periphery of the sealing portion 23. In addition, the current collection wiring 16 may be provided between the semiconductor layer 13 and the sealing part 23 as needed, and may be provided in the position which overlaps with the sealing part 23. FIG.

The surface of the current collector wiring 16 provided in this way is not covered with the transparent conductor 12 and is covered with the wiring protective layer 17 in the region surrounded by the inner periphery of the sealing portion 23. Further, the wiring protective layer 17 is entirely covered with a protective resin layer (not shown). Thus, contact between the electrolyte 18 and the current collector wiring 16 is prevented.

As shown in FIG. 1, the dye-sensitized solar cell 10 has a substantially rectangular shape when the dye-sensitized solar cell 10 is viewed along a direction perpendicular to the incident surface 14. The current collector wiring 16 is provided along the direction perpendicular to the longitudinal direction of the dye-sensitized solar cell 10 with the width of the current collector wiring 16 provided along the longitudinal direction of the dye-sensitized solar cell 10 being large. The current collector wiring 16 has a small width and is provided in a lattice shape.

The material constituting the current collector wiring 16 may be any metal having a lower resistance than the transparent conductor 12, and examples of such a material include metals such as gold, silver, copper, platinum, aluminum, titanium, and nickel. Is mentioned. Moreover, as a material which comprises the wiring protective layer 17, inorganic insulating materials, such as a lead-free transparent low melting glass frit, are mentioned, for example.

The counter electrode 20 is composed of a metal plate in which a catalyst layer (not shown) is formed on the surface of a titanium plate or a titanium alloy plate. The catalyst layer is made of a material that promotes the reduction reaction, and is formed on the surface of the titanium plate or the like on the working electrode 15 side. The catalyst layer is made of platinum or carbon.

The sealing part 23 connects the working electrode 15 and the counter electrode 20, and the electrolyte 18 between the working electrode 15 and the counter electrode 20 is sealed by being surrounded by the sealing part 23 as described above. ing. Thus, the sealing part 23 seals the electrolyte 18 provided around the plurality of semiconductor layers 13, whereby the dye-sensitized solar cell 10 is a single cell type.

Examples of the material constituting the sealing portion 23 include ionomers, ethylene-vinyl acetic anhydride copolymers, ethylene-methacrylic acid copolymers, ethylene-vinyl alcohol copolymers, ultraviolet curable resins, vinyl alcohol polymers, anhydrous Examples include maleic acid-modified polyethylene. In addition, the sealing part 23 may be comprised only with resin, and may be comprised with resin and an inorganic filler. Further, the sealing portion 23 may have a two-layer structure on the working electrode 15 side and the counter electrode 20 side, and one layer may be composed of a resin and the other layer may be composed of an inorganic substance. Further, the outer periphery of the sealing portion 23 may be further covered with a resin different from the resin constituting the sealing portion 23.

Further, when the counter electrode 20 is viewed along the direction connecting the working electrode 15 and the counter electrode 20 on the surface of the counter electrode 20 opposite to the working electrode 15 side, a terminal overlaps with the current collector wiring 16. 22 is formed. In addition, the terminal 22 is provided in the position which overlaps with the wide current collection wiring 16 provided along the longitudinal direction of the dye-sensitized solar cell 10. The terminal 22 is provided at a position overlapping the wide current collecting wiring 16 in this way, so that when the terminal 22 and another wiring are soldered, heat generated by soldering causes the wide current collecting wiring 16 to be wide. Is transmitted along the longitudinal direction of the dye-sensitized solar cell 10, and further transmitted perpendicularly to the longitudinal direction of the dye-sensitized solar cell 10 by the current collecting wiring 16 having a smaller width. Thus, it is possible to prevent heat from being locally accumulated and to prevent the dye-sensitized solar cell 10 from being damaged.

The terminal 22 is composed of a high melting point solder or a metal member containing at least one of copper and nickel. As the high melting point solder, it is preferable to use a solder having a melting point of 200 ° C. or higher (for example, 210 ° C. or higher). As such a high melting point solder, Sn—Cu, Sn—Ag, Sn—Ag—Cu, Sn—Au, Sn—Sb, Sn—Pb (Pb content is more than 85% by mass, for example) Etc., and one of these may be used alone, or two or more may be used in combination. Moreover, as a material which comprises a metal member, the alloy which contains another metal in copper and nickel other than the simple substance of copper and nickel is mentioned.

Next, the charging circuit 60 will be described.

FIG. 3 is a circuit diagram showing the charging circuit 60 shown in FIG. In the description of the charging circuit 60, “connection” may mean electrical connection. As shown in FIG. 3, the charging circuit 60 includes a first booster circuit 61 connected to the terminals 21 and 22 of the dye-sensitized solar cell 10 and a pair of terminals 63 and 63 connected to the first booster circuit 61. An LED driver 65 connected to the first booster circuit 61 and the pair of terminals 63, 63; an LED 66 connected to the LED driver 65; a second booster circuit 67 connected to the first booster circuit 61; A pair of USB terminals 68 and 68 connected to the 2 booster circuit 67 is provided as a main configuration.

The first booster circuit 61 includes a positive electrode and a negative electrode on the input side, and a positive electrode and a negative electrode on the output side. The negative electrode on the input side is connected to the terminal 21 of the dye-sensitized solar cell 10, and the positive electrode on the input side is The positive electrode and the negative electrode on the output side are connected to a pair of terminals 63 and 63, respectively, connected to the terminal 22 of the dye-sensitized solar cell 10. Note that the positive and negative electrodes on the output side of the first booster circuit 61 are connected via a Zener diode 62.

Further, the first booster circuit 61 is connected in series with the switches S1 and S2 connected to the positive electrode on the input side, the switch S3 connected in series with the switch S1 and connected to the positive electrode on the output side, and the switch S2. Switch S4 connected to the negative electrode on the output side, switch S1 and switch S3, one electrode is connected, capacitor S1 is connected to switch S2, switch S4 and the other electrode, switch S3 and output side And a capacitor C2 connected to the switch S4 and the other electrode on the output side, a resistor R1 connected to the switch S1 on the input side, and a resistor R2 connected to the switch S3 on the output side. The control part 64 is provided. Thus, the first booster circuit 61 is a charge pump booster circuit.

The switches S1 to S4 of the first booster circuit 61 are constituted by FETs (field effect transistors) or the like, and are turned on / off by the control unit 64. Capacitor C1 is a charge pump capacitor and stores electric power for boosting the voltage. The capacitor C2 is a voltage smoothing capacitor, and smoothes the voltage on the output side. The resistor R1 is a resistor for detecting an input voltage, and a voltage detected by the resistor is sensed by the control unit 64. The resistor R2 is a resistor for detecting an output voltage, and a voltage detected by the resistor is sensed by the control unit 64. Note that the duty of the switches S1 to S4 is controlled by the control unit 64 so that the voltage detected by the resistor R2 becomes a predetermined voltage, and the first booster circuit 61 is a kind of constant voltage circuit. In the first booster circuit 61, the switches S1 to S4 are semiconductors that generate heat when voltage is applied from the dye-sensitized solar cell 10, and are heat-generating components.

The pair of terminals 63 and 63 are connected to electrodes (not shown) of the secondary battery 55 in a state where a part of the secondary battery 55 is inserted into the battery holder 50.

The LED driver 65 connected to the positive and negative electrodes on the output side of the first booster circuit 61 senses the voltage from the first booster circuit 61 and the voltage of the secondary battery connected to the pair of terminals 63 and 63. Then, the LED 66 that is the charging indicator is turned on. The LED 66 is a two-color LED, and is configured to glow yellow during charging and glow green when charging is completed.

The second booster circuit 67 connected to the first booster circuit 61 includes a positive electrode and a negative electrode on the input side, and a positive electrode and a negative electrode on the output side. The positive electrode on the input side is the output side of the first booster circuit 61. The negative electrode on the input side is connected to the negative electrode on the output side of the first booster circuit 61. The positive and negative electrodes on the output side of the second booster circuit 67 are connected to a pair of USB terminals 68 and 68, respectively.

Further, the second booster circuit 67 includes a coil Lc connected to the positive electrode on the input side, a switch S5 connected in series with the coil Lc, and connected to the negative electrode on the input side and the negative electrode on the output side, and the coil Lc. Are connected to the output side positive electrode and cathode, and one electrode is connected to the output side positive electrode, and the other electrode is connected to the output side negative electrode capacitor C3. A resistor R3 connected to the input positive electrode, a resistor R4 connected to the output positive electrode, and a control unit 69. Thus, the second booster circuit 67 is a chopper booster circuit.

The switch S5 of the second booster circuit 67 is composed of an FET or the like, and is turned on / off by the control unit 69. The coil Lc stores power for boosting the voltage. The capacitor C3 is a voltage smoothing capacitor, and smoothes the voltage on the output side. The resistor R3 is an input voltage detection resistor, and a voltage detected by this resistor is sensed by the control unit 69. The resistor R4 is a resistor for detecting the output voltage, and the voltage detected by this resistor is sensed by the control unit 69. Note that the duty of the switch S5 is controlled by the control unit 69 so that the voltage detected by the resistor R4 becomes a predetermined voltage, and the second booster circuit 67 is a kind of constant voltage circuit. In the second booster circuit, the switch S5 and the coil Lc are semiconductors or coils to which a voltage is applied from the dye-sensitized solar cell 10, and are heat-generating components.

Note that a part of the first booster circuit 61 and the second booster circuit 67 may be integrated into an IC. For example, in this case, the portion of the first booster circuit 61 excluding the capacitors C1 and C2 may be integrated into an IC, or the portion of the second booster circuit 67 excluding the capacitor C3 and the coil Lc may be integrated into an IC. good. As described above, when a part of the first booster circuit 61 and the second booster circuit 67 is formed as an IC, the IC includes a heat-generating component.

The pair of USB terminals 68 and 68 are connected to a power supply terminal of the USB connector in a state where a USB connector (not shown) is inserted into the solar cell charger 1.

Next, the battery holder 50 will be described.

FIG. 4 is a side view of the charger with solar cell shown in FIG. As shown in FIGS. 1 and 4, the battery holder 50 has a battery casing 51 that covers at least a part of the secondary battery 55 and can be detached from the battery holder 50. The battery housing 51 has an insertion slot into which the secondary battery 55 is inserted, and is configured such that at least a part of the secondary battery 55 is inserted into the battery housing 51. Further, inside the battery casing 51, the pair of terminals 63 and 63 of the charging circuit 60 are exposed, and the terminals of the secondary battery 55 inserted into the battery holder 50 are in contact with each other. Therefore, an opening (not shown) is formed in the battery casing 51 so that the electrode of the secondary battery 55 can come into contact with the pair of terminals 63 and 63 when the secondary battery 55 is inserted.

As shown in FIG. 4, the battery holder 50 has an insertion port for inserting the battery housing 51 on the side surface side of the solar cell charger 1. Further, the battery holder 50 is provided so as to partially overlap the wiring of the charging circuit 60 when the battery holder is viewed from a direction perpendicular to the incident surface of the dye-sensitized solar cell 10.

Next, the housing 30 of the solar cell charger 1 will be described.

FIG. 5 is another side view of the module with solar cells shown in FIG. Specifically, it is a figure which shows the side surface adjacent to the side surface 35 shown in FIG.

As shown in FIG. 1, the housing 30 is formed with a window portion 37 through which the light incident surface 14 of the dye-sensitized solar cell 10 is exposed. The side of the housing 30 where the window 37 is formed is the front surface 33, and the opposite side of the front surface 33 is the back surface 34. The housing 30 has a substantially rectangular shape when viewed from the front surface 33 side, and the window portion 37 also has a rectangular shape. The window 37 is formed so as to be offset to one side along the longitudinal direction of the housing 30 when the housing 30 is viewed from the front surface 33. Note that the front surface 33 of the housing 30 is substantially planar. Further, the charging circuit 60 and the battery holder 50 are disposed inside the casing 30 on the side opposite to the side on which the window 37 is biased. The LED 66 is exposed on the front surface 33 of the housing 30.

In addition, as shown in FIG. 4, when the housing 30 is viewed from the side surface 35 side, the housing 30 is formed with a thick central portion 35 b and both end portions sandwiching the central portion 35 b are thinly formed. Yes. The central portion 35b protrudes in a convex shape on the side opposite to the front surface 33 side. In addition, an opening 41 that overlaps the insertion opening of the battery holder 50 is formed in the central portion 35b, and an opening 42 for inserting a USB connector is formed next to the opening 41.

In addition, as shown in FIG. 5, when viewing the housing 30 from the side surface adjacent to the side surface 35, the housing 30 is thin and has a constant thickness on the side opposite to the side surface 35 side. Further, the casing 30 is formed such that a part on the side surface 35 side is thick and protrudes on the opposite side to the front surface 33 side. Thus, the back surface 34 of the housing 30 is formed in a shape in which a part thereof is formed in a flat shape and the other part is protruded in a convex shape. The rear surface protruding in a convex shape is connected to the central portion 35 b of the side surface 35.

As shown in FIG. 5, such a housing 30 includes a first storage portion 31 surrounded by a broken line L <b> 1 that stores the dye-sensitized solar cell 10, and a broken line L <b> 2 that stores the battery holder 50 and the charging circuit 60. It has the 2nd accommodating part 32 enclosed.

As shown in FIG. 5, the first storage portion 31 includes the above-described window portion 37, a part of the front surface 33 of the housing 30, and a part of the back surface 34, and the first storage portion 31. The back surface 38 of the housing 30 is formed in a flat shape. And the 1st accommodating part 31 is made into the flat plate shape with uniform thickness as a whole.

On the other hand, the second storage portion 32 includes another part of the front surface 33 of the housing 30, the central part 35 b of the side surface 35 described above, and another part of the back surface 34. Another part of the back surface 34 protrudes in a convex shape as described above, and the back surface 39 of the housing 30 in the second storage portion 32 is a protruding portion that protrudes in a convex shape on the back surface 34. The second storage portion 32 is partially adjacent to the first storage portion 31 in the direction parallel to the incident surface 14 of the dye-sensitized solar cell 10 and is second with respect to the dye-sensitized solar cell 10. It is formed so that it may overlap on the opposite side to the front side of the 1 storage part 31.

As described above, the back surface 38 of the first storage portion 31 is flat, and the back surface 39 of the second storage portion 32 is a protruding portion protruding in a convex shape of the back surface 34. 38 is generally on the front surface 33 side with respect to the back surface 39 in the second storage portion 32.

In addition, as shown in FIGS. 1 and 5, when the plane S that is in contact with the protruding portion that is the back surface 38 of the first storage portion 31 and the back surface 39 of the second storage portion is defined, the protruding portion is in contact with the plane S. The contact portion is an end portion 39 a on the first storage portion 31 side in the back surface 39 of the second storage portion 32, and this contact portion is formed along the direction perpendicular to the incident surface 14 of the dye-sensitized solar cell 10. When the 2 storage part 32 is seen, it is arrange | positioned on one side rather than the one line L which passes along the gravity center C of the charger 1 with a solar cell, and is parallel to the entrance plane of the dye-sensitized solar cell 10.

The first storage portion 31 and the second storage portion 32 do not have to be partitioned by a sill plate, but the one partitioned by the sill plate is the charging circuit 60 and the battery holder 50, and the dye sensitization. This is preferable because heat transfer with the solar cell 10 is suppressed.

Next, the arrangement of each circuit constituting the charging circuit 60 will be described. FIG. 6 is a diagram showing the arrangement of each circuit in the charging circuit shown in FIG. In FIG. 6, wiring is omitted.

As shown in FIG. 6, when the charging circuit 60 is viewed along the direction perpendicular to the incident surface 14 of the dye-sensitized solar cell 10, the circuit board 61C on which the first booster circuit 61 of the charging circuit 60 is disposed is These are arranged so that one part overlaps with the dye-sensitized solar cell 10 and the other part does not overlap with the dye-sensitized solar cell 10. The switches S1 to S4, which are heat-generating components, are disposed in a region of the circuit board 61C that does not overlap with the dye-sensitized solar cell 10, and a control unit is disposed in the region that overlaps with the dye-sensitized solar cell 10. 64, resistors R1 and R2, and capacitors C1 and C2 are arranged.

Further, when the charging circuit 60 is viewed along the direction perpendicular to the incident surface 14 of the dye-sensitized solar cell 10, the circuit board 61C is disposed so as not to overlap the battery holder 50.

Similarly, the circuit board 67 </ b> C on which the second booster circuit 67 of the charging circuit 60 is arranged is partially overlapped with the dye-sensitized solar cell 10 and the other part is not overlapped with the dye-sensitized solar cell 10. Is arranged. And in the area | region which does not overlap with the dye-sensitized solar cell 10 in the circuit board 67C, switch S5 and the coil Lc which are exothermic components are arrange | positioned, Furthermore, in the area | region which overlaps with the dye-sensitized solar cell 10, A control unit 69, resistors R1 and R2, a diode D1, and a capacitor C3 are arranged.

Further, when the charging circuit 60 is viewed along the direction perpendicular to the incident surface 14 of the dye-sensitized solar cell 10, the circuit board 67C is disposed so as not to overlap the battery holder 50.

Further, the circuit board 65C on which the LED driver 65 is provided is arranged so that a part thereof overlaps the dye-sensitized solar cell 10 and the other part does not overlap the dye-sensitized solar cell 10.

As described above, when a part of the first booster circuit 61 and the second booster circuit 67 is an IC including a heat-generating component, the IC is generally heated, so that the dye increase It arrange | positions so that it may not overlap with the sensitive solar cell 10.

Next, the usage state of the solar battery charger will be described.

FIG. 7 is a diagram showing a use state of the solar cell charger 1 shown in FIG. As shown in FIG. 7, with the secondary battery 55 inserted into the battery holder 50, the solar cell-equipped charger 1 is placed on a plane 100 on which light hits, indicated by a broken line. At this time, as described above, when the plane S that is in contact with the protrusion 38 that is the back surface 38 of the first storage portion 31 and the back surface 39 of the second storage portion is defined, the contact portion where the protrusion is in contact with the plane S is the sun. It is arranged on one side of one line L passing through the center of gravity C of the battery charger and parallel to the incident surface of the dye-sensitized solar cell. Accordingly, the end 39a on the first storage portion 31 side of the back surface 39 of the second storage portion 32, which is the contact portion, serves as an action point, and the side surface 35 side of the second storage portion 32 is lifted from the flat surface 100, and the first storage portion. An end 38 a opposite to the second storage portion 32 side on the back surface 38 of 31 is in contact with the plane 100. At this time, since the protruding portion of the back surface 39 of the second storage portion 32 protrudes to the opposite side of the front surface 33 from at least a part of the back surface 38 of the first storage portion 31, the first storage portion 31 in the housing 30. The rear surface 38 of the rear surface is lifted from the plane 100 except for the end 38 a of the rear surface 38. That is, a part of the back surface 38 of the first storage unit 31 is lifted from the plane 100 and the other part is in contact with the plane 100. Thus, the tunnel-shaped ventilation path 101 having a wedge-shaped cross section is formed by the back surface 38 of the first storage unit 31, the back surface 39 of the second storage unit 32, and the plane 100.

In this state, when the solar cell charger 1 is irradiated with light such as sunlight, the light is transmitted from the incident surface 14 of the dye-sensitized solar cell 10 to the semiconductor layer 13 of the dye-sensitized solar cell 10. To reach. Then, electrons in the photosensitizing dye carried on the semiconductor layer 13 are excited, and electrons are injected from the excited photosensitizing dye into the conduction band of the semiconductor layer 13, and from the transparent conductor 12 and the current collector wiring 16. Electrons are transmitted to the terminal 21 and flow out of the dye-sensitized solar cell 10. Thus, a voltage is generated between the terminal 21 and the terminal 22 of the dye-sensitized solar cell.

At this time, in the first booster circuit shown in FIG. 3, the switches S1 and S4 are turned on, the switches S2 and S3 are turned off, the switches S1 and S4 are turned off, and the switches S2 and S4 are turned on. The switches S1 to S4 are controlled by the control unit 64 so that the state in which S3 is turned on is repeated at regular intervals. When the switches S1 and S4 are turned on and the switches S2 and S3 are turned off, the electrode on the side connected to the switch S1 of the capacitor C1 is positively charged. Next, in the state where the switches S1 and S4 are turned off and the switches S2 and S3 are turned on, the charge charged in the electrode on the side connected to the switch S1 of the capacitor C1 is discharged, and the capacitor The electrode on the side connected to the switch S2 of C1 is charged positively. In this way, the voltage is boosted and output. At this time, the duty of the switches S1 to S4 is controlled by the control unit 64 so that the voltage detected by the resistor R2 becomes a predetermined voltage as described above. If a voltage higher than a predetermined voltage is detected by the resistor R1, the control unit 64 turns off all the switches S1 to S4 and stops the boosting operation. When a voltage higher than a predetermined voltage is applied between the positive electrode and negative electrode on the output side, the positive electrode and negative electrode on the output side are short-circuited via the Zener diode 62.

For example, the first booster circuit 61 connected to the dye-sensitized solar cell 10 boosts the voltage of the terminals 21 and 22 of the dye-sensitized solar cell 10 to about twice. The electric power from the dye-sensitized solar cell 10 whose voltage has been boosted in this way is charged into the secondary battery via the pair of terminals 63 and 63.

On the other hand, in the second booster circuit 67, when the USB connector is inserted into the solar cell charger 1, the control unit 69 controls the switch S5 to repeat the on / off operation. Then, when the switch S5 is on, the power from the positive electrode on the input side is accumulated in the coil Lc, and when the switch S5 is off, the power stored in the coil Lc is released together with the power from the input side. Thus, the boosted power is output with the voltage smoothed by the smoothing capacitor C3 via the diode D1. At this time, the control unit 64 controls the duty of the switch S5 so that the voltage detected by the resistor R4 becomes a predetermined voltage. Furthermore, when a voltage higher than a predetermined voltage is detected by the resistor R1, the control unit 64 turns off the switch S5 and stops the boosting operation.

Thus, the second booster circuit 67 boosts the voltage output from the first booster circuit 61 by about 2 to 3 times, for example. The power from the dye-sensitized solar cell 10 whose voltage has been boosted by the first booster circuit 61 and the second booster circuit 67 in this way is output via a pair of USB terminals 68 and 68.

At this time, the switches S1 to S4 of the first booster circuit 61 and the switch S5 and the coil Lc of the second booster circuit 67 generate heat because they are heat-generating components. Heat generated from these exothermic components is released from the charging circuit 60. However, as described above, since these exothermic components are arranged at positions that do not overlap with the dye-sensitized solar cell 10, heat released from these exothermic components is conducted to the dye-sensitized solar cell 10. Is suppressed. Further, as described above, since these exothermic components are arranged at positions that do not overlap the battery holder 50, heat generated from the exothermic components is suppressed from being conducted to the battery holder 50. Further, a part of heat transmitted to the battery holder 50 is suppressed from being conducted to the inside of the battery casing 51 by the battery casing 51. Therefore, it is possible to suppress the heat released from the heat generating component from being transmitted to the secondary battery inserted into the battery holder 50.

Moreover, since the dye-sensitized solar cell 10 absorbs light such as sunlight, the heat due to light is accumulated and the temperature rises. Thus, the heat stored in the dye-sensitized solar cell 10 is conducted to the housing 30. However, the back surface 38 of the first storage portion 31 in the housing 30 is in contact with the tunnel-shaped ventilation path 101 except for the end portion 38a. Therefore, the housing 30 is cooled by the air passing through the tunnel-shaped ventilation path 101. In this way, the case 30 is cooled, so that the temperature of the dye-sensitized solar cell 10 is suppressed from increasing. Further, as described above, since the second storage portion 32 in which the charging circuit 60 is stored has a side surface 35 side that is lifted from the plane 100, the heat released from the heat-generating component is the second of the housing 30. It is easy to discharge | release to space via the accommodating part 32, and the raise of the temperature of the charging circuit 60 is suppressed.

As described above, according to the solar cell charger 1 in the present embodiment, in the case of defining the plane S where the protruding portion of the back surface 39 of the second storage portion 32 and the back surface 38 of the first storage portion 31 are in contact. The end 39a, which is a contact portion with the plane S of the protruding portion, is a single line L that passes through the center of gravity C and is parallel to the incident surface when the second storage portion 32 is viewed along a line perpendicular to the incident surface 14. It is arranged on one side. Therefore, when the battery charger 1 with the solar cell is placed on the plane 100, the end 39 a and the end 38 a of the back surface 38 of the first storage unit 31 are in contact with the plane 100. At this time, since the protruding portion of the second storage portion 32 protrudes to the opposite side of the front surface 33 from at least a portion of the back surface 38 of the first storage portion, at least a part of the back surface 38 of the first storage portion 31 is The solar battery charger 1 is lifted from the plane 100 on which the battery charger 1 is placed. In this way, the tunnel-like ventilation path 101 is formed by the back surface 38 in the first storage portion 31 and the back surface 39 in the second storage portion 32 and the plane 100. Therefore, an air flow is easily formed by the ventilation path 101, the first storage part 31 can be cooled by the flowing air, and the dye-sensitized solar cell 10 is cooled via the first storage part 31. Can do. In this way, when the energy of light incident from the incident surface 14 is converted into electric power, and the electric power is charged into the secondary battery 55 by the charging circuit 60, the dye-sensitized solar cell 10 is prevented from becoming high temperature. Thus, the dye-sensitized solar cell 10 can be prevented from being damaged by heat.

Further, according to the solar cell charger 1 in the present embodiment, a part of the second storage portion 32 that is a portion in which the charging circuit 60 having the heat-generating component in the housing 30 is stored is lifted from the plane 100. Therefore, the heat released from the heat-generating component can be efficiently released into the space.

Further, since the back surface 38 of the first storage unit 31 in the housing 30 is formed to be closer to the front surface 33 than the back surface 39 of the second storage unit 32, the solar cell charger 1 is stored in a bag or the like. In this case, the first storage portion 31 is not easily disturbed and can be stored easily.

Further, when the energy of light incident from the light incident surface 14 in the dye-sensitized solar cell 10 is converted into electric power and the secondary battery 55 is charged by the charging circuit 60, the first booster circuit 61 The switches S1 to S4 which are exothermic parts generate heat. However, since this heat-generating component is arranged side by side with the dye-sensitized solar cell 10 when viewing the charging circuit 60 along the direction perpendicular to the incident surface 14 of the dye-sensitized solar cell 10, heat generation is generated. It can suppress that the heat which generate | occur | produces from a property component is transmitted to the dye-sensitized solar cell 10, and it can suppress that the dye-sensitized solar cell 10 is damaged with a heat | fever. Further, the control unit 64 that is at least a part of components other than the heat-generating component of the charging circuit 60, the resistors R1 and R2, and the capacitors C1 and C2 are opposite to the incident surface 14 side of the dye-sensitized solar cell 10. It is arranged so as to overlap with the dye-sensitized solar cell 10 on the side. Therefore, the area occupied by the portion arranged side by side with the dye-sensitized solar cell 10 in the charging circuit 60 is reduced by the area of the component arranged overlapping the dye-sensitized solar cell 10. Thereby, the area of the incident surface 14 of the dye-sensitized solar cell 10 can be increased, and the light incident surface 14 of the dye-sensitized solar cell 10 can be greatly exposed. Thus, efficient charging can be performed.

Further, since the switches S1 to S4 which are heat generating components are arranged so as not to overlap the battery holder 50, it is possible to suppress the heat generated from the heat generating components from being transmitted to the secondary battery 55. Therefore, it can suppress that the charging efficiency of the secondary battery 55 falls with a heat | fever, and more efficient charge can be performed.

Further, the battery holder 50 further includes a battery casing 51 that covers at least a part of the secondary battery 55, and even when a part of heat is transferred from the heat-generating component to the battery holder 50, the secondary battery 55. The battery case 51 covering at least a part of the battery can prevent heat from being transferred to the secondary battery 55.

Moreover, since the dye-sensitized solar cell 10 is a single-cell dye-sensitized solar cell, the connection conductor for connecting the cells to each other, or the sealing for sealing the cell and the connection conductor, etc. The portion is unnecessary and can be formed thin. Accordingly, heat is easily released from the dye-sensitized solar cell 10. Thus, the dye-sensitized solar cell 10 can be prevented from being damaged by heat.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component same or equivalent to 1st Embodiment, the same referential mark is attached | subjected and the overlapping description is abbreviate | omitted. FIG. 8 is a diagram showing a battery charger with a solar cell according to the second embodiment of the present invention.

As shown in FIG. 8, in the charger 2 with a solar cell of the present embodiment, the second storage portion 32 has an inclined portion 32a that is inclined from the back surface 34 side to the front surface 33 side, and the inclined portion 32a is the first portion. In the point connected with the accommodating part 31, it differs from the charger 1 with a solar cell of 1st Embodiment.

According to the solar cell charger 2 of the present embodiment, when a force is applied to the housing 30, the stress due to this force is dispersed by the inclined portion 32 a, and the first storage portion 31 and the second storage portion 32. Concentration of stress at the boundary can be suppressed. Therefore, the case 30 can be prevented from being damaged when a force is applied to the case 30. For example, as shown in FIG. 8, in the state where the solar cell charger 2 is placed on the flat surface 100, an object is placed on the front surface 33 of the solar cell charger 2 by the carelessness of the user. In some cases, a force F indicated by an arrow is applied to the housing 30. However, even in such a case, the stress applied to the housing 30 by the force F can be prevented from being dispersed by the inclined portion 32a and the housing 30 from being damaged.

(Third embodiment)
Next, a third embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component same or equivalent to 1st Embodiment, the same referential mark is attached | subjected and the overlapping description is abbreviate | omitted. FIG. 9 is a diagram showing a charger with a solar cell according to the third embodiment of the present invention.

As shown in FIG. 9, the solar cell charger 3 of the present embodiment has the same thickness as the second storage portion 32 at the end of the first storage portion 31 opposite to the second storage portion 32 side. Moreover, it differs from the charger 1 with a solar cell in 1st Embodiment in the point in which the convex part 31a which protrudes on the opposite side to the front 33 side is formed. Accordingly, the back surface 38a of the convex portion 31a is flush with the back surface 39 of the second storage portion 32.

In this case, in the same manner as in the first embodiment, when defining a plane that contacts the rear surface 38 of the first storage portion 31 and the protruding portion that is the rear surface 39 of the second storage portion, this plane is the convex portion 31a. Touch. Further, when the second storage portion 32 is viewed along a line perpendicular to the incident surface 14, the convex portion 31 a has a second storage portion 32 with respect to one line L passing through the center of gravity C and parallel to the incident surface 14. Is arranged on the side opposite to the contact portion side in contact with this plane.

According to the solar cell charger 3 in the present embodiment, when the solar cell charger 1 is placed on a flat surface, the end 38 a formed in a convex shape of the back surface 38 in the first storage portion 31, and the first 2 The back surface 39 of the storage portion 32 contacts the flat surface 100, and the back surface 34 of the housing 30 is bridged with respect to the flat surface 100. Therefore, a larger tunnel-shaped ventilation path 101 is formed, and the dye-sensitized solar cell 10 can be further cooled.

Further, since the back surface of the convex portion 31a is flush with the back surface 39 of the second storage portion 32, when the charger 3 with a solar cell is placed on the flat surface 100 such as a desk, the incident surface 14 is set to the flat surface 100. Can be parallel.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component same or equivalent to 1st Embodiment, the same referential mark is attached | subjected and the overlapping description is abbreviate | omitted. FIG. 10 is a circuit diagram showing a charging circuit of the solar battery charger according to the fourth embodiment of the present invention.

As shown in FIG. 10, the charger with solar cell of the present embodiment is the first embodiment in that a constant voltage circuit 71 is used instead of the first booster circuit 61 in the charging circuit of the first embodiment. This is different from the solar battery charger 1.

The constant voltage circuit 71 of the charging circuit according to the present embodiment includes an input-side positive electrode and a negative electrode and an output-side positive electrode and a negative electrode, similar to the booster circuit 61 according to the first embodiment. The positive electrode on the input side is connected to the terminal 22 of the dye-sensitized solar cell 10 and the positive and negative electrodes on the output side are connected to a pair of terminals 63 and 63, respectively. Has been.

The constant voltage circuit 71 includes a transistor Tr1 having a collector connected to the positive electrode on the input side and an emitter connected to the positive electrode on the output side, one connected to the collector of the transistor Tr1, and the other connected to the base of the transistor Tr1. Resistor R5, a Zener diode D2 connected to the negative and anode of the input and output sides, a resistor R6 connected to the cathode of the Zener diode D2 and the other connected to the positive electrode of the output side, a collector Is connected to the base of the transistor Tr1, the emitter is connected to the cathode of the Zener diode D2 and one of the resistors R6, the transistor Tr2 is connected to the positive electrode on the output side, and the other is connected to the base of the transistor Tr2. And one is connected to the negative electrode on the input and output sides, and the other is connected to the other of the resistor R8 A resistor R8 connected to the base of the transistor Tr2, a capacitor C4 whose electrodes are connected to the positive and negative electrodes on the input side, and a capacitor C4 whose electrodes are connected to the positive and negative electrodes on the output side Prepare. In the constant voltage circuit 71, the transistor Tr1 is a semiconductor to which a voltage is applied from the dye-sensitized solar cell 10, and is a heat generating component. Further, in such a constant voltage circuit 71, for example, an IC of a three-terminal regulator of a series control system can be used except for the capacitors C4 and C5. In this case, the IC includes a heat generating component.

In this constant voltage circuit 71, when the output voltage decreases, the voltage applied to both ends of the resistors R7 and R8 also decreases, and the voltage applied to both ends of the resistor R8 also decreases. Accordingly, the base voltage of the transistor Tr2 decreases. On the other hand, since the emitter of the transistor Tr2 is maintained at a constant voltage by the resistor R6 and the Zener diode D2, the base current of the transistor Tr2 decreases as the voltage applied to the resistor R8 decreases. Therefore, the collector current of the transistor Tr2 is reduced. Thus, the voltage drop of the resistor R5 is reduced, and the base voltage of the transistor Tr1 is increased. Accordingly, the base current of the transistor Tr1 increases, the internal resistance between the collector and emitter of the transistor Tr1 decreases, and the voltage between the collector and emitter of the transistor Tr1 decreases. Since the output voltage is a value obtained by subtracting the voltage between the collector and emitter of the transistor Tr1 from the input voltage, the output voltage rises as a result. Thus, the voltage is kept constant. The constant voltage circuit 71 is prevented from oscillating by the capacitors C4 and C5.

When such a constant voltage circuit 71 is arranged in the housing 30, for example, since the transistor Tr1 to which the voltage from the dye-sensitized solar cell 10 is applied is a heat-generating component, the transistor Tr1 is When the charging circuit 60 is viewed along a direction perpendicular to the incident surface 14 of the sensitized solar cell 10, the sensitized solar cell 10 is disposed so as not to overlap the dye-sensitized solar cell 10. Then, other parts are arranged in a region overlapping with the dye-sensitized solar cell 10. Alternatively, as described above, when the constant voltage circuit 71 is an IC except for the capacitors C4 and C5, since the IC is generally heated, this IC is used for the dye-sensitized solar cell 10. The capacitors C4 and C5 are arranged so as to overlap the dye-sensitized solar cell 10.

The present invention has been described above by taking the first to fourth embodiments as examples, but the present invention is not limited to these.

For example, in the third embodiment, the second storage portion 32 has the same shape as the second storage portion 32 in the first embodiment, but may have the same shape as the second storage portion 32 in the second embodiment.

Further, in the first, second, and third embodiments, the back surface 39 of the second storage portion 32 may be formed into a shape such that the cross section draws an arc or the side surface 35 side is the thickest, for example.

In the first and fourth embodiments, the solar cell charger 1 includes the second booster circuit 67 for outputting power from the pair of USB terminals 68 and 68 to the USB connector. The terminals 68 and 68 are not necessary, and the second booster circuit 67 is not necessarily required.

Furthermore, in the first embodiment, the battery holder 50 has the battery casing 51, but the battery casing 51 may be omitted. Furthermore, without providing the battery holder 50, the pair of terminals 63, 63 may be drawn out of the housing.

In the first embodiment, the first booster circuit 61 is a charge pump type booster circuit, and the second booster circuit 67 is a chopper type booster circuit. The type of the booster circuit that constitutes 67 is not particularly limited. Furthermore, there is no particular limitation on how much the voltage is boosted by the first booster circuit 61 and the second booster circuit 67. Further, in the constant voltage circuit of the fourth embodiment, the type of the constant voltage circuit is not particularly limited, and another constant voltage circuit may be used.

Further, in the first embodiment, the circuit boards 61C and 67C of the first booster circuit 61 and the second booster circuit 67 partially overlap with the dye-sensitized solar cell 10 and the other part thereof dye-sensitized. A region that is provided so as not to overlap with the solar cell 10 and does not overlap with the dye-sensitized solar cell 10 in the circuit boards 61C and 67C is provided with a heat-generating component and overlaps with the dye-sensitized solar cell 10. In this case, parts other than the exothermic parts are arranged. However, the present invention is not limited to this, and a part of the component other than the heat-generating component may be provided in a region that does not overlap with the dye-sensitized solar cell 10. Further, a part of the charging circuit such as the LED driver 65 is provided so as to overlap the dye-sensitized solar cell 10, and all of the parts other than the heat-generating parts in the first and second booster circuits 61 and 67 are dye-sensitized. The first and second booster circuits 61 and 67 may be arranged side by side with the dye-sensitized solar cell 10 provided in a region that does not overlap the sensitive solar cell 10. Similarly, in the fourth embodiment, all the components of the constant voltage circuit 71 are provided in a region that does not overlap with the dye-sensitized solar cell 10, and other components that are not exothermic components other than the constant voltage circuit 71 in the charging circuit. However, it may be provided so as to overlap with the dye-sensitized solar cell 10.

According to the present invention, a battery charger with a solar cell that performs efficient charging while using a dye-sensitized solar cell is provided.

1, 2, 3 ... Charger with solar cell 10 ... Dye-sensitized solar cell 11 ... Transparent substrate 12 ... Transparent conductor 13 ... Semiconductor layer 14 ... Incident surface 15 ... Working electrode 16 ... Current collecting wiring 17 ... Wiring protective layer 18 ... Electrolyte 20 ... Counter electrode 21, 22 ... Terminal 23 ... Sealing part 30 ... Case 31 ... 1st accommodating part 31a ... Convex part 32 ... 2nd accommodating part 32a ... Inclined part 33 ... Front 34 ... Back 35 ... Side 37 ... Window part 38, 39 ... Back 41,42 ... Opening 50 ... Battery holder 51 ... Battery casing 55 ... Secondary battery 60 ... Charging circuit 61 ... First booster circuit 62 ...・ Zener diode 63 ・ ・ ・ Terminal 65 ・ ・ ・ LED driver 67 ・ ・ ・ Second booster circuit 68 ・ ・ ・ USB Element 71 ... Constant voltage circuit 100 ... Plane 101 ... Ventilation path C1, C2, C3, C4, C5 ... Capacitor Lc ... Coil R1, R2, R3, R4, R5, R6, R7 , R8... Resistors S1, S2, S3, S4, S5... Switches Tr1, Tr2.

Claims (6)

A dye-sensitized solar cell having a light incident surface;
A charging circuit that is electrically connected to the dye-sensitized solar cell and charges the secondary battery;
A housing for housing the dye-sensitized solar cell and the charging circuit;
With
The charging circuit has a heat-generating component,
When viewing the charging circuit along a direction perpendicular to the incident surface, the exothermic component of the charging circuit is arranged side by side with the dye-sensitized solar cell, and at least other than the exothermic component A battery charger with a solar cell, wherein a part of the component is arranged to overlap the dye-sensitized solar cell on a side opposite to the incident surface side of the dye-sensitized solar cell. The charging circuit includes a constant voltage circuit, and the constant voltage circuit is arranged alongside the dye-sensitized solar cell when the charging circuit is viewed along a direction perpendicular to the incident surface. The solar cell charger according to claim 1, wherein the charger is a solar cell charger. A part of the charging circuit is composed of an IC including the heat-generating component, and the IC is a dye-sensitized solar cell when the charging circuit is viewed along a direction perpendicular to the incident surface. The charger with a solar cell according to claim 1, wherein the charger is disposed side by side. A battery holder for storing at least a part of the secondary battery;
The heat-generating component is disposed so as not to overlap the battery holder when the charging circuit is viewed along a direction perpendicular to the incident surface. The charger with a solar cell as described in. The battery charger with a solar battery according to claim 4, wherein the battery holder further includes a battery casing covering at least a part of the secondary battery. The charger with a solar cell according to any one of claims 1 to 5, wherein the dye-sensitized solar cell is a single cell type dye-sensitized solar cell.

Images