JPH09121575A - Solar cell module and portable power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module which is suitable for the construction of a portable power supply which is easy to store and easy to carry. SOLUTION: A solar cell module 1 has a front panel part which is made of transparent synthetic resin integrally and has a flat front surface and a side surface part 1b which is continuously provided along the circumference of the front panel part 1a and extended backward. Solar cells 2 are sealed in the front panel part 1a along the front surface of the front panel part 1a and, further, attachment support parts 4 and 5 which protrude from the rear of the front panel part 1a and to which the components of a portable power supply are attached are formed integrally on the rear of the front panel part 1a. The components such as batteries are attached to the attachment support parts 4 and 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable power source having a built-in storage battery, which is used when a commercial power source cannot be used due to a natural disaster such as an earthquake or when camping outdoors. It also relates to a solar cell module used to charge such a portable power storage battery.

[0002]

2. Description of the Related Art As shown in FIG. 11, a conventional portable power source 300 is a lead storage battery (nominal voltage 12V) 30.
There is one in which the solar cell module 201 and the commercial power source 203 can be used as means for charging the storage battery 308. That is, the portable power supply 300 includes an input jack 302 for connecting an output terminal of the solar cell module 201 and a solar cell input line 313 connected to the input jack 302 in a main body casing 301, and an AC adapter (commercial power supply). AC / DC converter for AC / DC conversion of
Input jack 304 for connecting to the output terminal of the commercial power supply input line 3 connected to the input jack 304
14 is provided. When the solar cell module 201 is charged, the output of the solar cell module 201 is the input jack 302, the backflow prevention diode 303 provided in the solar cell input line 313, and the overcharge prevention circuit 30.
7 to the storage battery 308. When the commercial power source 203 is charged, the output of the commercial power source 203 is AC / DC converted by the AC adapter 204, and the input jack 304, the backflow prevention diode 305 provided in the commercial power source input line 314, and the overcurrent for limiting the overcurrent. The storage battery 30 passes through the limiting circuit 306 and the overcharge prevention circuit 307.
8 is supplied. Here, the overcharge prevention circuit 307 detects the terminal voltage V _T of the charging after the start battery 308, the terminal voltage V _T is prohibited charge reaches a predetermined upper limit value V _H, once the terminal voltage V _T After reaching the upper limit value V _H , charging is permitted again when the terminal voltage V _T falls below a predetermined lower limit value V _L. On the other hand, in the case of discharging, the DC output of the storage battery 308 is directly supplied to the load 206 through the output jack 312 after passing through the overdischarge prevention circuit 309 that limits the overcurrent, or an output circuit including an inverter. It is converted into an AC output (100V) by 310 and supplied to the load 205 through the outlet 311.

As shown in FIG. 10, a conventional solar cell module (having a maximum output of about 5 W or more) 201, which is used to charge the storage battery 308 of the portable power source 300, is cost and mass producible. Therefore, it is configured in a flat plate shape (called a super straight type or a substrate type). It should be noted that FIG. 1A shows the solar cell module 201 as seen from a direction perpendicular to the light receiving surface (cell) 202, and FIG. 1B shows the solar cell module 201 as seen from the side. ing.

[0004]

However, since the main body casing 301 of the conventional portable power source 300 described above is separate from the solar cell module 201, it is necessary to charge the solar cell module 201 at a moving destination. Both have to be carried, which is inconvenient to carry and has a problem of poor storability.

Here, even if the main body casing 301 of the portable power source 300 and the solar cell module 201 are simply assembled together, the solar cell module 201 is formed in a flat plate shape, so that there is a structural restriction. , Difficult to assemble. In addition, many mounting members are required, resulting in an increase in cost.

Therefore, an object of the present invention is to construct a part of the main body casing with a solar cell module,
It is to provide a portable power source that is easily stored and easy to carry. Another object is to provide a solar cell module suitable for configuring such a portable power source.

Further, in general, when the solar cell is charged outdoors, the ambient temperature of the storage battery rises due to the sunlight, so that the life of the storage battery is shortened and the reliability is lowered. , Indoor commercial power supply 20
It is necessary to lower the charging voltage as compared with the case of charging by 3. However, the conventional portable power source 300 described above is used.
Since the allowable charging voltage range (the range defined by the upper limit value V _H and the lower limit value V _L ) is set to be the same in the charging mode by the solar cell module 201 and the charging mode by the commercial power source 203, the solar cell is outdoors. When charging is performed by the module 201, the life and reliability of the storage battery 308 may be impaired.

Therefore, another object of the present invention is to provide a portable power supply which can automatically detect whether the charging mode is a solar battery charging mode or a commercial power charging mode, and which can optimally set a charging voltage allowable range. To do.

[0009]

In order to achieve the above object, a solar cell module according to claim 1 has a built-in storage battery, and the storage battery is charged by either a solar cell or a commercial power source, A solar cell module forming a part of a portable power supply for supplying the output of a storage battery to an external load, the front panel section having a flat front surface integrally formed of transparent synthetic resin, and the front panel section. And has a frame-shaped side surface portion which is continuous with the periphery and extends rearward, in the front panel portion, the solar cells are sealed along the front surface of the front panel portion, and on the back side of the front panel portion, Project from the back of this front panel,
It is characterized in that an attachment auxiliary portion for attaching the components of the portable power source is integrally formed.

According to the solar cell module of the first aspect, a component such as a storage battery or an electric circuit board for charging or discharging the storage battery is attached to the mounting auxiliary portion formed on the back surface of the front panel portion. Comprises the main part of the portable power supply. As a result, the portable power supply is easily assembled. Here, since the attachment auxiliary portion is integrally formed on the back side of the front panel portion so as to project from the back surface of the front panel portion, the above-mentioned components can be attached only by locking the attachment auxiliary portion. Therefore, the number of additional mounting members is small, and the portable power supply can be assembled at low cost. Further, since the front panel section is made of a transparent synthetic resin, the incidence of light on the solar cells is not hindered.

The solar cell module according to claim 2 is
The solar cell module according to claim 1 is characterized in that an electric circuit board for charging or discharging the storage battery is integrally sealed on the back side of the front panel portion.

In the solar cell module according to claim 2,
Since the electric circuit board is integrally sealed on the back side of the front panel portion, a mounting member for locking the electric circuit board can be omitted. Therefore, the assembly of the portable power supply becomes easier. Further, since the intrusion of water or moisture into the electric circuit board from the outside is prevented by the sealing, the waterproofness and the moisture resistance of the electric circuit board are improved.

A portable power supply according to a third aspect is a portable power supply which has a built-in storage battery, charges the storage battery with either a solar cell or a commercial power supply, and supplies the output of the storage battery to an external load. The solar cell module according to claim 2 is provided, and the storage battery is attached to the attachment auxiliary portion of the solar cell module.

In the portable power source of the third aspect, the solar cell module constitutes a part of the main body casing, and the main parts of the portable power source, for example, the storage battery, are accommodated in the housing-shaped solar cell module. Therefore, this portable power source has a good storability and is easy to carry.

The portable power source according to claim 4 is the portable power source according to claim 3, wherein an opaque coating layer is provided on the back surface of the front panel portion and the back surface of the side surface portion of the solar cell module. It is characterized by being

In the portable power supply according to the present invention, the opaque coating layer allows the inside of the main body to be seen through the portion of the front panel portion of the solar cell module where the solar cells are not arranged and the side portion. Is prevented. In addition, sunlight is prevented from penetrating into the main body through a portion of the front panel portion where the solar cells are not arranged and the side portion. Therefore, the temperature rise inside the main body due to sunlight is suppressed.

According to a fifth aspect of the present invention, in the portable power source according to the fourth aspect, the coating layer reflects light.

In the portable power source of the present invention, since the coating layer reflects light, the temperature rise inside the main body due to sunlight is further suppressed.

A portable power source according to a sixth aspect is a portable power source which has a built-in storage battery, charges the storage battery by either a solar cell or a commercial power supply, and supplies the output of the storage battery to an external load. The solar cell input section to which the solar cell power is input, the commercial power source input section to which the commercial power source power is input via an AC adapter that performs AC / DC conversion, and the commercial power source input section to the commercial power source input section. To detect whether or not the commercial power supply is input to the commercial power supply input section,
An input detection unit that outputs a detection signal that indicates a charging mode by the commercial power supply when the power of the commercial power supply is input, while indicating a charging mode by the solar cell when the power of the commercial power supply is not input, and the input. In response to the detection signal output by the detection unit, while selecting the solar cell input unit when the detection signal represents the charging mode by the solar cell,
An input switching unit that selects the commercial power supply input unit when the detection signal indicates a charging mode by the commercial power supply, a charging voltage allowable range for the storage battery is set, and the input of the solar battery input unit and the commercial power supply input unit is set. A charging control unit is provided for controlling the electric power input to the input unit selected by the switching unit to be supplied to the storage battery so that the terminal voltage of the storage battery falls within the allowable charging voltage range.

According to another aspect of the portable power source of the present invention, the input detection unit detects whether or not the commercial power source is input to the commercial power source input unit to determine whether the solar battery is in the charging mode or the commercial power source. Whether it is in the charging mode by the power supply is automatically detected. The input switching unit selects the solar battery input unit when in the solar battery charging mode, and selects the commercial power input unit when in the commercial power charging mode. Then, the charging control unit supplies the electric power input to the solar battery input unit to the storage battery so that the terminal voltage of the storage battery is within the allowable charging voltage range when the charging mode by the solar battery is used, while the commercial power source is used. In the charging mode according to (4), control is performed to supply the electric power input to the commercial power input unit to the storage battery so that the terminal voltage of the storage battery falls within the allowable charging voltage range. Thereby, charging is smoothly performed according to the charging mode.

A portable power source according to a seventh aspect is the portable power source according to the sixth aspect, wherein the charging control unit sets the charging voltage allowable range to a first charging voltage allowable range for a charging mode by a solar cell. And a second charging voltage allowable range for a charging mode by a commercial power source, and receiving the detection signal output by the input detection unit, the first charging when the detection signal represents a charging mode by a solar cell. While the voltage allowable range is selected, the second charge voltage allowable range is selected when the detection signal indicates a charging mode by the commercial power source.

In the portable power source of the present invention, the charging control section has, as the charging voltage allowable range, a first charging voltage allowable range for the charging mode by the solar cell and a second charging voltage for the commercial mode. The charging voltage allowable range is set, and the first charging voltage allowable range is selected in the solar battery charging mode, and the second charging voltage allowable range is selected in the commercial power source charging mode. And
When the charging control unit is in the charging mode by the solar cell,
The power input to the solar cell input unit is supplied to the storage battery so that the terminal voltage of the storage battery falls within the first charging voltage allowable range, and is input to the commercial power input unit when the charging mode is the commercial power source. Control is performed to supply the stored power to the storage battery such that the terminal voltage of the storage battery falls within the second charge voltage allowable range. Here, the first charge voltage allowable range may be set lower than the second charge voltage allowable range, assuming a charging mode using a solar cell outdoors. Therefore, even if the ambient temperature of the storage battery rises due to sunlight, it is possible to prevent the life of the storage battery from being shortened and the reliability from being lowered.

The portable power supply according to claim 8 is a portable power supply which has a built-in storage battery, charges the storage battery with either a solar battery or a commercial power supply, and supplies the output of the storage battery to an external load. A solar cell input section to which the power of the solar cell is input, a commercial power input section to which the power of the commercial power is input via an AC adapter that performs AC / DC conversion, and a solar cell that selects the solar cell input section. A switch for the user to switch between the charging mode and the charging mode by the commercial power source for selecting the commercial power source input section, the first charging voltage allowable range for the charging mode by the solar cell, and the charging mode by the commercial power source. The second charging voltage allowable range is set, and when the charging mode by the solar cell is instructed by the switch, the power input to the solar cell input unit is set. While supplied to the battery so that the terminal voltage of the storage battery enters the first charging voltage allowable range,
When a charge mode by the commercial power source is instructed by the switch, control is performed to supply the power input to the commercial power source input unit to the storage battery such that the terminal voltage of the storage battery falls within the second charge voltage allowable range. And a charging control unit.

In the portable power source according to the present invention, a user operates a switch to select a solar cell input section for charging by a solar cell and to select the commercial power source input section. One of the charging modes by the commercial power source for charging the battery is instructed. The charging control unit has a first allowable charging voltage range for a solar battery charging mode and a second charging voltage allowable range for a commercial power source charging mode.
The charging voltage allowable range is set, the first charging voltage allowable range is selected when the solar battery charging mode is instructed, and the second charging voltage allowable range is set when the commercial power source charging mode is instructed. Select each. Then, when the charging mode by the solar cell is instructed, the charging control unit supplies the electric power input to the solar cell input unit to the storage battery such that the terminal voltage of the storage battery falls within the first charging voltage allowable range. On the other hand, when the charging mode by the commercial power source is instructed, control is performed to supply the power input to the commercial power source input unit to the storage battery such that the terminal voltage of the storage battery falls within the second charge voltage allowable range. . Here, the first charge voltage allowable range may be set lower than the second charge voltage allowable range, assuming a charging mode using a solar cell outdoors. Therefore, even if the ambient temperature of the storage battery rises due to sunlight, it is possible to prevent the life of the storage battery from being shortened and the reliability from being lowered.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a solar cell module and a portable power source of the present invention will be described in detail below.

1 to 4 show the appearance of a portable power supply 90 having a solar cell module 1 embodying the present invention. 1 is a front view of the portable power supply 90 (a direction perpendicular to the front panel 1a of the solar cell module 1), FIG. 2 is a back view of the portable power supply 90, and FIG. 4 shows the portable power source 90 as seen from the D direction in FIG. 1, respectively. Also,
5 shows a cross section taken along the line AA in FIG. 1, and FIG. 6 shows a cross section taken along the line BB in FIG. The portable power source 90 has a built-in storage battery 7 and charges the storage battery 7 with either a solar battery or a commercial power source.
The output of is supplied to an external load.

As shown in FIGS. 1 to 4, a main body casing 91 of the portable power source 90 comprises a solar cell module 1 in the form of a housing and a back cover 10 in the form of a flat plate, and has a flat, substantially rectangular parallelepiped shape as a whole. doing.

As can be seen from FIGS. 1, 3 and 4, the solar cell module 1 includes a front panel part 1 integrally formed of a synthetic resin 3 and having a flat front surface.
a and a frame-shaped side surface portion 1b which is continuous with the peripheral edge of the panel portion 1a and extends rearward. The synthetic resin 3 is a colorless transparent thermosetting resin which is liquid at room temperature and solidifies at a relatively low temperature of several tens of degrees Celsius, for example, unsaturated polyester. As shown in FIGS. 5 and 6, the solar battery cells 2 are sealed in the front panel portion 1a along the front surface of the front panel portion 1a, and the back side of the front panel portion 1a (solar battery cells 2) is provided. In addition, an electric circuit board 6 for charging or discharging the storage battery 7 is integrally sealed. Since the electric circuit board 6 is integrally sealed on the back side of the front panel portion 1a in this way, a mounting member for locking the electric circuit board 6 can be omitted. Therefore, the portable power source 90
Assembly is easy. Moreover, since it is possible to prevent water and moisture from entering the electric circuit board 6 from the outside by the sealing, it is possible to enhance the waterproofness and the moistureproofness of the electric circuit board 6. The front panel 1a is made of transparent synthetic resin 3
Therefore, the incidence of light on the solar cell 2 is not hindered.

In addition, as a mounting auxiliary portion for mounting the storage battery 7, a boss 4 and a rib 5 protruding from the back surface of the front panel portion 1a are provided on the back side of the front panel portion 1a in a position aligned with the electric circuit board 6. It is formed integrally. Rib 5
Is a frame-shaped one according to the external dimensions of the storage battery 7, and the storage battery 7 can be fitted therein. The boss 4 is a thick-walled cylindrical shape arranged on both sides of the rib 5, and protrudes from the back surface of the front panel portion 1 a by the thickness dimension of the storage battery 7. When attaching the storage battery 7 to the solar cell module 1, the storage battery 7 is fitted to the rib 5 from the rear side, the locking plate 8 is brought into contact with the rear surface of the storage battery 7, and the locking plate 8 is fixed to the boss 4 with the screw 9. To do. The storage battery 7 is locked to the front panel portion 1 a in the surface direction by the ribs 5 and in the front-rear direction by the locking plate 8. In this way, the storage battery 7 can be easily attached.

The back surface and side surface portion 1b of the front panel portion 1a
The opaque and heat-insulating coating layer 1 on the back surface of the
3 is applied. The coating layer 13 is, for example, an aluminum vapor deposition layer. This coating layer 1
3, the solar cell 2 of the front panel portion 1a
It is possible to prevent the inside of the main body 91 from being seen through through the peripheral edge portion 1e and the side surface portion 1b where the is not arranged. Further, when the portable power source 90 is placed outdoors to receive sunlight, it is possible to prevent sunlight from penetrating into the main body 91 through the peripheral edge portion 1e and the side surface portion 1b of the front panel portion 1a. Therefore, the temperature rise inside the main body 91 due to sunlight can be suppressed. Moreover, since the coating layer 13 reflects light, the main body 91 exposed to sunlight
The internal temperature rise can be further suppressed.

As can be seen from FIGS. 2 and 5, an annular handle portion 14 protruding from the back surface of the front panel portion 1a and penetrating the back cover 10 is integrally formed at the center of the upper rear portion of the front panel portion 1a. It is provided. The end surface 14a of the handle portion 14 is in the same plane as the rear surface 10a of the back cover 10.
The user can easily carry the portable power source 90 by putting his / her hand in the handle portion 14. It should be noted that four fingers other than the thumb should be inserted in the grip portion 14, and the thumb should be turned from the side surface portion 1b to the front panel portion 1a.

As shown in FIG. 2, a fitting hole 20 having a shape corresponding to the handle portion 14 and penetrating the handle portion 14 is provided at the center of the upper portion of the back cover 10. A plurality of oval vent holes 11 are provided around the fitting hole 20 of the back cover 10 and in the lower part of the back cover 10. When charging,
Air can be circulated in and out of the main body casing 91 through the vent holes 11 to radiate heat and suppress an increase in temperature inside the main body 91.

Further, rectangular openings 17, 17 for attaching the stand 12 to the main body casing 91 are provided on both sides of the upper portion of the back cover 10. As is clear from FIGS. 2, 3 and 6, the stand 12 is a bent bar. That is, the stand 12 is in contact with the installation surface 99 (see FIG. 6) of the portable power source 90, and a pair of upright portions 12b that are continuous with both ends of the ground portion 12a and extend perpendicularly to the ground portion 12a.
And a pair of rotation locking portions 12c connected to the end portions of the standing portions 12b and extending perpendicularly to the grounding portions 12a and the rising portion 12a, and a pair of rotation locking portions 12c connected to the end portions of the rotation locking portions 12c and the grounding portions 12a. It is composed of a pair of rotating shaft portions 12d extending outward in parallel. As shown in FIG. 2, the rotating shaft portion 12d
Is fitted into a hole 15 of a bearing portion 19 formed integrally on the back side of the front panel portion 1a. As a result, the stand 12
Can freely rotate about the rotating shaft portion 12d. As shown by broken lines in FIG.
At a position lying parallel to 0, an installation state in which the installation surface 99 and the front panel unit 1a are parallel can be realized. On the other hand, as shown by the solid line in FIG.
At a position raised vertically with respect to the above, an installation state in which the installation surface and the front panel portion 1a are inclined can be realized.

When the stand 12 is attached to the main body casing 91, the rotating shaft portions 12d and 12d are passed through the openings 17 and 17 of the back cover 10 through the openings 17 and 17 of the back cover 10 while the standing portions 12b and 12b are bent slightly inward. Put it inside.
Then, the upright portions 12b and 12b are returned to their original positions and straightened, and the rotary shaft portions 12d and 12d are attached to the holes 1 of the bearing portions 19 and 19.
5 and 15 are fitted. Thereby, the stand 12 can be easily attached.

The length of the upright portion 12b of the stand 12 is such that the angle between the installation surface 99 and the front surface of the front panel portion 1a is 30 ° when the upright portion 12b is vertically raised with respect to the back cover 10. Is set to. The reason for this is
Considering the solar radiation data over one year in Japan (eg Tokyo), the tilt angle is 0 ° and the south tilt angle is 30 °.
This is because the optimum amount of solar radiation can be obtained with and the two-stage switching between horizontal installation and 30 ° tilt installation is considered to be practically sufficient.

As shown in FIG. 2, the bearing portion 19 is provided at the edge of the stand mounting openings 17, 17 of the back cover 10.
Hemispherical protrusion 1 adjacent to the location corresponding to hole 15 of
8, 18 are provided. The protrusions 18 and 18 give a click feeling when the standing portion 12b is laid parallel to the back cover 10 and lock the rotation locking portion 12c so that the stand 12 does not rattle at the lying position. .

As shown in FIG. 4, the solar cell module 1
The side surface portion 1b is provided with an opening / closing portion 16 that can be opened and closed in a hinged manner. In the opening / closing part 16, an input jack 24 for connecting the output terminal of an AC adapter (an AC / DC converter for AC / DC converting a commercial power source), an outlet 100 for AC100V output, and an output jack for DC12V output. 34 and 34 are attached.

As described above, in the portable power source 90, the solar cell module 1 constitutes a part of the main body casing 91, and the electric circuit board 6 is integrally sealed on the back side of the front panel portion 1a of the solar cell module 1. Has been done.
Therefore, this portable power source 90 is provided with the storage battery 6 on the back side of the front panel portion 1a of the solar cell module 1 having a housing shape.
By assembling other components, attaching the back cover 10 to the back side of the solar cell module 1, and attaching the stand 12 through the opening 17 of the back cover 10, the assembly can be easily performed.

Further, since the portable power source 90 is in a state where the main components (excluding the stand 12) are housed in the housing-shaped solar cell module 1, the portable power source 90 has a good storability and is easy to carry. In particular, since the handle portion 14 is provided on the back side of the main body casing 91, it becomes easier to carry.

In the above description, the electric circuit board 6 is integrally sealed on the back side of the solar cell module 1, but the invention is not limited to this. For example, a mounting auxiliary portion for mounting the electric circuit board 6 may be integrally formed on the back side of the front panel portion 1a, and the electric circuit board 6 may be locked to the mounting auxiliary portion.

FIG. 7 shows a schematic block configuration of an electric circuit 92 of the portable power source 90.

Electric circuit 92 of this portable power source 90
Is an input detection circuit 25 as an input detection unit provided in the commercial power input line 36, an overcurrent limiting circuit 26, an input switching circuit 23 as an input switching unit provided in the solar cell input line 35, and A charging control circuit 27 as a charging control unit provided on a common input line 37 that joins the battery input line 35 and the commercial power supply input line 36, a small sealed lead acid battery (nominal voltage 12V) 28, and an overdischarge prevention circuit. And an output circuit 30.

The electric power output from the solar cell module 1 is input to the solar cell input line 35 as the solar cell input section. Further, the commercial power source input line 36 as a commercial power source input unit receives the power of the commercial power source 21 via the AC adapter 22 and the input jack 24 that perform AC / DC conversion.

The input detection circuit 25 detects whether or not the power of the commercial power supply 21 is input to the commercial power supply input line 36, and indicates the charging mode by the solar cell when the power of the commercial power supply 21 is not input. On the other hand, when the power of the commercial power source 21 is input, the detection signal S _M indicating the charging mode by the commercial power source is output.

The input switching circuit 23 is the input detection circuit 2 described above.
In response to the detection signal S _M output by S5, when the detection signal S _M represents the charging mode by the solar cell, the front and rear solar cell input lines 35 are kept conductive while the detection signal S _{M
When M} represents the charging mode by the commercial power source, the front and rear solar cell input lines 35 are cut off. As a result, the solar cell input line 35 or the commercial power input line 36 is selected according to the charging mode.

The overcurrent limiting circuit 26 limits the current flowing through the commercial power supply input line 36 so as to be equal to or less than a preset upper limit value.

The charge control circuit 27 has, as the charge voltage allowable range for the storage battery 28, the first charge voltage allowable range (V _OL , V _OH ) for the solar battery charging mode and the first charge voltage allowable range for the commercial power source. 2 Allowable range of charging voltage (V
_IL , V _IH ) and. Then, the input detection circuit 2
5 in response to the detection signal S _M output by the solar cell 5, when the solar cell is in the charging mode, the first charging voltage allowable range (V _OL ,
V _OH ) while selecting the second allowable charging voltage range (V _IL , V _IH ) in the charging mode by the commercial power source. Then, when the charging control circuit 27 is in the charging mode by the solar cell, the terminal voltage V _T of the storage battery 28 controls the electric power input to the solar cell input line 35 to the first charging voltage allowable range (V _OL , V _OH ). To enter the above storage battery 28
On the other hand, in the charging mode by the commercial power source, the terminal voltage V _T of the storage battery 28 enters the second charging voltage allowable range (V _IL , V _IH ) in the charging mode by the commercial power source. Then, the control for supplying the storage battery 28 is performed. Specifically, as shown in FIG. 9 (a), in the charging mode by the solar cell, by detecting the terminal voltage V _T of the charging after the start battery 28, the terminal voltage V _T of the battery 28 reaches the upper limit V _OH Charging is prohibited, and once the terminal voltage V _T reaches the upper limit value V _OH , the charging is allowed again when the terminal voltage V _T falls below the lower limit value V _OL . Further, as shown in FIG. 9 (b), and in the charging mode by commercial power, by detecting the terminal voltage V _T of the charging after the start battery 28, the terminal voltage V _T of the battery 28 reaches the upper limit V _IH charging And once the terminal voltage V _T reaches the upper limit value V _IH , charging is allowed again when the terminal voltage V _T falls below the lower limit value V _IL . Thereby, charging can be smoothly performed according to the charging mode.

Here, when the solar cell module 1 is charged outdoors, the temperature inside the main body 91 rises due to sunlight, but the upper limit of usable temperature of a general small sealed lead acid battery is 50 ° C. Therefore, it is necessary to suppress the temperature of the storage battery 28 to 50 ° C. or lower. Therefore, when the solar cell module 1 is charged outdoors, the storage battery 28
Assuming that the temperature of 50 ° C. is suppressed to 50 ° C. or lower, for example, the first charging voltage allowable range (V _OL , V _OH ) = (13.0, 14.
0) (unit: volt). When the commercial power supply 21 is charged indoors, assuming that the temperature of the storage battery 28 is kept within the standard temperature range of 5 ° C. to 35 ° C., for example, the second charging voltage allowable range (V _IL , V _IH ). = (13.7, 1
4.7) (Unit: Volt). As described above, in the portable power supply 90, the first charging voltage allowable range (V _OL , V _OH ) selected in the solar battery charging mode is set to the second charging voltage allowable range (V _OL , V _OH ) selected in the commercial power supply charging mode. It can be set lower than _IL , _VIH ). Therefore, even if the ambient temperature of the storage battery 28 rises due to sunlight, it is possible to prevent the life of the storage battery 28 from being shortened and the reliability from being lowered.

When discharging, the storage battery 28 shown in FIG. 7 is used.
The DC output (12V) of the battery passes through the overdischarge prevention circuit 29 that limits the overcurrent, and then is directly supplied to the load 32 through the output jack 34, or the AC output (100V) is further supplied by the output circuit 30 including an inverter. ) And is supplied to the load 31 through the outlet 33.

FIG. 8 concretely shows a main part of the electric circuit 92 shown in FIG. 7, that is, a part which works to charge the storage battery 28.

The constant voltage circuit 40 is connected to the solar cell input line 3
5 is a circuit that creates a constant voltage (DC5V) by the power input to the commercial power input line 36, and is a diode D ₃ connected to the solar cell input line 35 and a diode connected to the commercial power input line 36. and D _4, consisting of a switching regulator RG connected via a resistor R ₉ to the diodes D _3, D _4, the electrolytic capacitor C ₁ for smoothing, C ₂ Prefecture. The constant voltage circuit 40 supplies a constant voltage (DC5V) to the overcurrent limiting circuit 26 and the charge control circuit 27 through the constant voltage supply line 38.

The input detection circuit 25 includes a current limiting resistor R ₁ connected to the commercial power source input line 36 and the resistor R ₁
And an electromagnetic relay (relay coil) RC connected between the ground and the ground. When the output voltage of the AC adapter 22 is applied to the commercial power supply input line 36, the relay RC is energized and excited, and when the output voltage of the AC adapter 22 is not applied to the commercial power supply input line 36, the relay RC is applied. RC is not energized and is not excited. Whether or not the relay RC is energized (excitation or non-excitation) is based on the detection signal S _M described above.
Is equivalent to That is, the non-excitation of the relay RC represents the charging mode by the solar cell, while the excitation of the relay RC represents the charging mode by the commercial power source.

The input switching circuit 23 is a contact point RC-1 which is switched depending on whether or not the relay RC of the input detection circuit 25 is energized (excitation or non-excitation) (in the figure, a switching position (normal position) in the case of non-excitation). And a backflow prevention diode D ₁
Consists of When the relay RC is in the non-excited state, that is, in the charging mode by the solar cell, the solar cell input line 35 before and after the input switching circuit 23 is in the conductive state. On the other hand, when the relay RC is excited, that is, in the charging mode by the commercial power source, the solar cell input line 35 before and after the input switching circuit 23 is cut off. As a result, the solar cell input line 35 or the commercial power input line 36 is selected according to the charging mode.

The overcurrent limiting circuit 26 includes a resistor R ₂ and a backflow prevention diode D ₂ provided in a commercial power input line 36, a comparator CMP ₁ , resistors R _{3 to} R _8, and a variable (semi-fixed) resistor VR. It consists of ₁ . Since the current flowing through the commercial power supply input line 36 is proportional to the voltage drop across the resistor R ₂ , the comparator CMP ₁ includes a resistor R ₃ and a resistor R _3.
The potential at the connection point with ₄ is compared with the reference potential at the connection point with the resistors R ₆ and R ₇ . When the former is lower than the latter, H is output to the output terminal 51 as a signal allowing charging.
While the (high) level is output, when the former is higher than the latter, L (low) is output to the output terminal 51 as a signal for prohibiting charging.
Output level. By adjusting the variable resistor VR ₁ , it is possible to change the criterion for determining whether or not there is an overcurrent.

The charge control circuit 27 includes a first charge voltage allowable range (V _OL , V _OH ) and a second charge voltage allowable range (V _IL ,
V _IH ), and based on the comparison result of the storage battery terminal voltage detection circuit unit 41, which compares the charging voltage allowable range with the terminal voltage V _T of the storage battery 28. And a charging current control circuit section 42 for controlling on / off of charging current for the storage battery 28.

The storage battery terminal voltage detection circuit 41 includes a relay R
C energization presence of (excitation, de-energized) and the contact RC-2 is switched by the (in the figure shows the switching position when de-energized (normal position)), variable (semi-fixed) resistance VR ₂ to VR ₄
And resistors R _{10 to} R ₁₅ , a comparator CMP _2, and a diode D ₆ . The common terminal of the relay contact RC-2 is connected to the + terminal (anode) of the storage battery 28. In general, the variable (semi-fixed) resistor VR ₂ and the resistor R ₁₃ are for setting the upper limit value V _OH of the first charging voltage allowable range, and the variable (semi-fixed) resistor VR ₃ and the resistor R ₁₄ are the second. This is for setting the upper limit value V _IH of the charging voltage allowable range. Further, the resistors R ₁₀ and R ₁₁ are connected to the + of the comparator CMP ₂ .
It is for setting the reference potential to the input terminal. The resistor R ₁₂ , the variable resistor R _4, and the diode D ₆ have a lower limit value V _OL of the first charge voltage allowable range and a lower limit value V _IL of the second charge voltage allowable range, respectively, as described later. It works to make it lower than the value.

The charging current control circuit 42 includes a power MOS transistor TR ₁ provided on the common input line 37,
A gate circuit 43 for switching on / off of the power MOS transistor TR ₁ and an NPN transistor TR ₂ are provided. A diode D ₇ is provided between the base terminal of the NPN transistor TR ₂ and the output terminal 51 of the comparator CMP ₁ to provide the NPN transistor TR ₂
Output terminal 5 of the comparator CMP ₂ and the base terminal of
Diodes D ₈ are respectively connected between the two.
A resistor R ₁₇ for supplying a base current is connected between the base terminal of the NPN transistor TR ₂ and the constant voltage supply line 38, and whether charging is being performed between the emitter terminal of the NPN transistor TR ₂ and the ground. A light emitting diode LED ₁ for indicating whether or not it is connected. The gate circuit 43 receives the potential level of the output terminal (collector terminal) 53 of the NPN transistor TR ₂ via the resistor R ₁₈ ,
While turning on the power MOS transistor TR ₁ and the voltage of the constant voltage supply line 38 when the output terminal 53 is at L level (DC5V) is applied to the gate G of the power MOS transistor TR _1, the output terminal 53 is H level , The gate G of the power MOS transistor TR ₁
And the source S are set to the same potential to turn off the power MOS transistor TR ₁ . When both the output terminal 51 of the comparator CMP _{1 and} the output terminal 52 of the comparator CMP ₂ are at the H level, the NPN
The base terminal of the transistor TR ₂ becomes H level and N
The PN transistor TR ₂ is turned on. As a result, NPN
The output terminal 53 of the transistor TR ₂ becomes the L level, and the gate circuit 43 becomes the power MOS transistor TR ₁
Turn on. This allows the storage battery 28 to be charged. At the same time, the light emitting diode LED ₁ lights up to indicate that charging is in progress. On the other hand, the output terminal 51 of the comparator CMP ₁ or the comparator CM
When at least one output terminal 52 of the P ₂ is at the L level, the NPN transistor TR ₂ base terminal of the NPN transistor TR ₂ becomes L level is turned off. As a result, the output terminal 53 of the NPN transistor TR ₂ becomes H level.
When the gate voltage reaches the level, the gate circuit 43 turns off the power MOS transistor TR ₁ . As a result, charging of the storage battery 28 is prohibited. At the same time, the light emitting diode LED ₁ is turned off to indicate that charging is stopped.

Now, when the relay RC of the input detection circuit 25 is non-excited, that is, in the charging mode by the solar cell, the contact RC-2 of the storage battery terminal voltage detection circuit 41 is in the normal position shown, and the resistance R ₁₃ and the resistance R ₁₃ are connected. The potential at the connection point with R ₁₅ is proportional to the terminal voltage of the storage battery 28, and the variable resistance VR ₂
And a value corresponding to the resistance R ₁₃ . Comparator CMP
₂ is the potential at the connection point between the resistors R ₁₃ and R ₁₅ and the resistance R
₁₀ and is compared with the reference potential at the connection point between the resistor R _11, when charging after starting the former is lower than the latter outputs an H level to an output terminal 52 as a signal to permit charging, than the former the latter When it becomes high, the L level is output to the output terminal 52 as a signal for prohibiting charging. As a result, by the operation of the charging current control circuit 42 described above, the storage battery 2 after the start of charging
8 terminal voltage V _T of allow charging to reach the upper limit V _OH, can be prohibited and reaches the upper limit V _OH charging. After the comparator CMP ₂ once outputs the L level to the output terminal 52, the diode D ₆ becomes a forward bias and a current flows through the resistor R ₁₂ , the variable resistor R ₄ and the diode D ₆ , and as a result, the comparator CMP ₂ The reference potential of the + input terminal decreases. When the potential at the connection point between the resistors R ₁₃ and R ₁₅ falls below the lowered reference potential at the connection point between the resistors R ₁₀ and R ₁₁ , the comparator C
MP ₂ is output terminal 52 as a signal for permitting charging again.
The H (high) level is output to. As a result, by the operation of the charging current control circuit 42 described above, once the terminal voltage V _T reaches the upper limit value V _OH , charging can be permitted again when the terminal voltage V _T falls below the lower limit value V _OL. it can.

On the other hand, when the relay RC of the input detection circuit 25 is excited, that is, in the charging mode by the commercial power source, the contact RC-2 of the storage battery terminal voltage detection circuit 41 is switched to the operating position (the side opposite to the normal position shown). And resistance R ₁₄
The potential at the connection point between the resistor R ₁₅ and the resistor R ₁₅ is proportional to the terminal voltage of the storage battery 28 and has a value corresponding to the variable resistors VR ₃ and R ₁₄ . The comparator CMP ₂ includes resistors R ₁₄ and R ₁₅
The potential at the connection point with and the reference potential at the connection point between the resistors R ₁₀ and R ₁₁ are compared, and when the former is lower than the latter after the start of charging, H is output to the output terminal 52 as a signal permitting charging. When the former is higher than the latter, the L level is output to the output terminal 52 as a signal for prohibiting charging. As a result, by the operation of the charging current control circuit 42 described above, charging is allowed until the terminal voltage V _{T of the} storage battery 28 after the start of charging reaches the upper limit value V _IH , and when the upper limit value V _IH is reached, charging is prohibited. it can. Once comparator CMP
_{After 2} outputs the L level to the output terminal 52, the diode D ₆ becomes a forward bias and a current flows through the resistor R ₁₂ , the variable resistor R ₄ and the diode D ₆ , and as a result, the + input terminal of the comparator CMP ₂ The reference potential of is decreased.
Then, when the potential at the connection point between the resistors R ₁₄ and R ₁₅ becomes lower than the lowered reference potential at the connection point between the resistors R ₁₀ and R ₁₁ , the comparator CMP ₂ outputs a signal that allows charging again. The H (high) level is output to the output terminal 52.
As a result, by the operation of the charging current control circuit 42 described above, once the terminal voltage V _T reaches the upper limit value V _IH , charging can be permitted again when the terminal voltage V _T falls below the lower limit value V _IL. it can.

Thus, according to this electric circuit 92,
It is possible to automatically detect whether the charging mode is the solar battery charging mode or the commercial power charging mode, and the charging voltage allowable range can be optimally set.

When an overcurrent flows through the commercial power input line 36 in the commercial power charging mode, the comparator CMP ₁ outputs an L signal to the output terminal 51 as a signal for prohibiting charging.
Output level. As a result, the power MOS transistor TR ₁ is operated by the operation of the charging current control circuit 42 described above.
Turns off and charging can be prohibited.

The input detection circuit 25 is omitted and the contact R
The interlocking switch that allows the user to manually operate C-1 and RC-2 may be used. In this case, the user manually switches the interlocking switch to select the solar cell input section and the charging mode by the solar cell,
It is possible to select a commercial power source charging mode for selecting the commercial power source input section. Contact points RC-1 and RC-2
As the interlock switch is used, the charging mode is switched between the first charging voltage allowable range (V _OL , V _OH ) for charging by the solar cell and the second charging voltage for charging by the commercial power source.
It involves switching to the charging voltage allowable range (V _IL , V _IH ).
Therefore, the optimum allowable charging voltage range is selected according to the charging mode.

[0063]

As is apparent from the above, according to the solar cell module of the first aspect, a component such as a storage battery or this storage battery is charged or discharged in the attachment auxiliary portion formed on the back surface of the front panel portion. The main part of the portable power supply can be configured by attaching the electric circuit board for the portable power supply, and as a result, the portable power supply can be easily assembled. Further, since the above-mentioned components can be attached only by being locked to the attachment auxiliary portion, the number of additional attachment members can be reduced and the portable power source can be assembled at low cost.

In the solar cell module of the second aspect, since the electric circuit board is integrally sealed on the back side of the front panel portion, the mounting member for locking the electric circuit board can be omitted, and the portable power source can be used. It can be assembled even more easily. Further, since the intrusion of water or moisture into the electric circuit board from the outside is prevented by the sealing, it is possible to enhance the waterproofness and moistureproofness of the electric circuit board.

In the portable power supply of claim 3, the solar cell module constitutes a part of the main body casing, and the main parts of the portable power supply are accommodated in the housing-shaped solar cell module. Therefore, this portable power source has a good storability and is easy to carry.

In the portable power source of claim 4, the opaque coating layer allows the inside of the main body to be seen through the portion of the front panel portion of the solar cell module where the solar cells are not arranged and the side portion. It can be prevented. Further, it is possible to prevent sunlight from penetrating into the main body through a portion of the front panel portion where the solar cells are not arranged and the side surface portion, and suppress a temperature rise inside the main body due to the sunlight.

In the portable power source of claim 5, since the coating layer reflects light, it is possible to further suppress the temperature rise inside the main body due to sunlight.

In the portable power supply according to the sixth aspect, whether the input detection unit is in the charging mode by the solar cell by detecting whether or not the power of the commercial power supply is input to the commercial power supply input unit, It is possible to automatically detect whether or not the charging mode is the commercial power source, and the charging can be smoothly performed according to the charging mode.

In the portable power supply of claim 7, the charge control unit has, as the charge voltage allowable range, a first charge voltage allowable range for the solar battery charging mode and a second charging voltage for the commercial power source charging mode. The voltage allowable range is set, and the first charging voltage allowable range is selected in the solar battery charging mode, and the second charging voltage allowable range is selected in the commercial power source charging mode. The first charge voltage allowable range can be set lower than the second charge voltage allowable range, assuming an outdoor charging mode using a solar cell, so that even if the ambient temperature of the storage battery rises due to sunlight, It is possible to prevent the life from shortening and the reliability from decreasing.

In the portable power source according to the eighth aspect, the user operates a switch to select a solar cell input section for charging and a charging mode by a solar cell,
One of the charging modes by the commercial power source for selecting and charging the commercial power source input section is instructed. The charging control unit sets a first charging voltage allowable range for the solar battery charging mode and a second charging voltage allowable range for the commercial power source charging mode, and the solar battery charging mode is instructed. At this time, the first charging voltage allowable range is selected, and when the charging mode by the commercial power source is instructed, the second charging voltage allowable range is selected. The first charge voltage allowable range can be set lower than the second charge voltage allowable range, assuming an outdoor charging mode using a solar cell, so that even if the ambient temperature of the storage battery rises due to sunlight, It is possible to prevent the life from shortening and the reliability from decreasing.

[Brief description of the drawings]

FIG. 1 is a diagram showing a front panel portion of a portable power supply embodying the present invention as viewed from the front.

FIG. 2 is a diagram showing a back side of the portable power supply.

FIG. 3 is a diagram showing the portable power supply seen from a direction C in FIG.

FIG. 4 is a diagram showing the portable power supply seen from a direction D in FIG.

5 is a cross-sectional view taken along the line AA in FIG.

6 is a sectional view taken along the line BB in FIG.

FIG. 7 is a block diagram showing an electric circuit of the portable power supply.

FIG. 8 is a diagram showing a main part of the electric circuit of FIG. 7.

FIG. 9 is a diagram illustrating a charging operation of the portable power supply.

FIG. 10 is a diagram showing an appearance of a conventional solar cell module.

FIG. 11 is a block diagram showing an electric circuit of a conventional portable power supply.

[Explanation of symbols]

1 Solar Cell Module 1a Front Panel 1b Side 2 Solar Cell 4 Boss 5 Rib 6 Electric Circuit Board 10 Back Lid 12 Stand 91 Main Body Casing 90 Portable Power Supply

Claims (8)

[Claims] 1. A solar cell module having a built-in storage battery, which constitutes a part of a portable power supply for charging the storage battery by either a solar cell or a commercial power supply and supplying the output of the storage battery to an external load. There is a front panel part having a flat front surface integrally formed of transparent synthetic resin, and a frame-shaped side surface part that extends rearward and is continuous with the peripheral edge of the front panel part. , The solar cells are sealed along the front surface of the front panel section, and the back side of the front panel section protrudes from the back surface of the front panel section to assist the mounting of the components of the portable power supply. A solar cell module, wherein the parts are integrally formed. 2. The solar cell module according to claim 1, wherein an electric circuit board for charging or discharging the storage battery is integrally sealed on the back side of the front panel section. Solar cell module. 3. A portable power supply, which has a built-in storage battery, charges the storage battery with either a solar cell or a commercial power supply, and supplies the output of the storage battery to an external load. A portable power supply comprising a solar cell module, wherein the storage battery is attached to the attachment auxiliary portion of the solar cell module. 4. The portable power supply according to claim 3, wherein an opaque coating layer is provided on the back surface of the front panel section and the back surface of the side surface section of the solar cell module. . 5. The portable power supply according to claim 4, wherein the coating layer reflects light. 6. A portable power supply, which has a built-in storage battery, charges the storage battery by either a solar battery or a commercial power supply, and supplies the output of the storage battery to an external load, the power of the solar battery being input. The solar cell input section, the commercial power source input section to which the power of the commercial power source is input via the AC adapter that performs the AC / DC conversion, and the commercial power source input section determines whether or not the commercial power source is input. An input detection unit that detects and outputs a detection signal that indicates the charging mode by the solar battery when the power of the commercial power source is not input, and that indicates the charging mode by the commercial power source when the power of the commercial power source is input. And receiving the detection signal output by the input detection unit and selecting the solar cell input unit when the detection signal represents the charging mode by the solar cell, while the detection signal is commercial The input switching unit that selects the commercial power input unit when representing the charging mode by the power source, the charging voltage allowable range for the storage battery is set, and the input switching unit selects the solar battery input unit or the commercial power input unit. A portable power supply, comprising: a charging control unit that controls the electric power input to the input unit to be supplied to the storage battery such that the terminal voltage of the storage battery falls within a charging voltage allowable range. 7. The portable power source according to claim 6, wherein the charging control unit has, as the charging voltage allowable range, a first charging voltage allowable range for a charging mode by a solar cell and a charging mode by a commercial power source. And a second charge voltage allowable range for setting the second charge voltage allowable range for receiving the detection signal output by the input detection unit and selecting the first charge voltage allowable range when the detection signal indicates a charging mode by the solar cell, A portable power source, wherein the second allowable charging voltage range is selected when the detection signal indicates a charging mode by a commercial power source. 8. A portable power supply, which has a built-in storage battery, charges the storage battery by either a solar battery or a commercial power supply, and supplies the output of the storage battery to an external load, wherein the power of the solar battery is input. The solar cell input section, the commercial power source input section to which the power of the commercial power source is input via the AC adapter that performs the AC / DC conversion, the solar cell charging mode that selects the solar cell input section, and the commercial power source input A switch for the user to switch between the charging mode by the commercial power source for selecting the parts, the first charging voltage permissible range for the charging mode by the solar cell, and the second charging voltage permissible range for the charging mode by the commercial power source. When the charging mode by the solar cell is instructed by the switch, the power input to the solar cell input unit is set to the first terminal voltage of the storage battery. While supplying the storage battery so that the electric voltage is within the allowable range, the terminal voltage of the storage battery is used for the second charging of the electric power input to the commercial power input unit when the switch instructs the charging mode by the commercial power supply. A portable power supply, comprising: a charging control unit that controls the supply of the storage battery so that the voltage falls within an allowable voltage range.