JPH0514524Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a portable solar cell power supply device.

[Prior Art] In recent years, the use of solar cells has increased as photoelectric conversion efficiency has improved. In particular, portable television receivers,
2. Description of the Related Art Portable power supplies using solar cells have become popular as simple power supplies for electronic devices used outdoors, such as cassette tape recorders.

This power supply device has a built-in Si single crystal solar cell, for example, and is equipped with a rechargeable secondary battery that can be loaded as an option.
It can also be used under cloudy weather and at night when sunlight cannot be obtained.

[Problems to be solved by the invention] However, in conventional devices, the solar cell and the secondary battery are combined through fixed wiring, and the output voltage can be changed depending on the application by switching an external switch. Therefore, the switching operation was troublesome.

Furthermore, in order for the changeover switch to function effectively, a predetermined number of secondary batteries must be loaded and used at all times, which is uneconomical due to the increased weight and number of batteries when carried.

The purpose of this invention is to improve ease of use by switching the output voltage in a simple way, and to also be economical by loading and using the number of secondary batteries according to the intended use. An object of the present invention is to provide a portable solar cell power supply device.

[Means and effects for solving the problems] That is, the above-mentioned object of the present invention is to provide a solar cell with a built-in solar cell and a plurality of rechargeable batteries, each of which is arranged for each secondary battery. detecting the presence or absence of a battery, and connecting the detected secondary battery in series to the solar battery and an output terminal, the output voltage being variable according to the number of loaded secondary batteries. This is achieved by a portable power supply device using a solar cell, which is characterized in that it is installed in a solar cell.

The loaded secondary batteries are connected in series by the switch means, thereby making it possible to arbitrarily change the output voltage.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a circuit diagram according to one embodiment of the present invention.

A solar cell 1 is shown as a block, and a plurality of secondary batteries 3, four in this embodiment, are provided so as to be chargeable via a backflow prevention diode 2.

Further, the outputs of the secondary batteries 3 are connected in series so that a voltage at both ends can be supplied to the output terminal 4.

In the secondary battery 3, a switch means 5 is connectably arranged between both electrodes of each battery, and the switch means 5 are connected in series.

The switch means 5 is in a state where the corresponding secondary battery 3 is not loaded (1 from the top in the figure).
It is provided by a microswitch that is short-circuited in the electromagnetic state shown by the 3rd and 3rd dotted lines, and opens when the battery is loaded (the state shown by the solid line in the figure).

FIG. 2 shows a schematic external view of the portable power supply device according to this embodiment.

In the figure, two secondary batteries 3 are connected to the battery holder part 6.
It is stored in.

Further, in the figure, the light condensing surface and external output terminal of the solar cell are not shown.

Near the center of each body of the secondary battery 3,
A movable part 7 of the microswitch is arranged to protrude, and when a battery is installed, the movable part 7 is pressed and the switch contact is opened.

A crystalline Si solar cell, an amorphous solar cell, a compound semiconductor solar cell, etc. can be applied to the solar cell 1, and a NiCd battery, a lead battery, a lead battery, etc. can be used as the secondary battery.
A lithium battery, a silver oxide battery, etc. can be used.

In the power supply device configured as described above, when the secondary battery is loaded, the switch means 5 detects the battery and connects the battery to the solar cell 1 and the output terminal 4. As a result, the output terminal 4 is supplied with an output voltage corresponding to the number of batteries loaded.

In this embodiment, four NiCd batteries with an output voltage of 1.2V are connectable, and by selecting the number of batteries, 1.2V, 2.4V, 3.6V, and 4.8V can be obtained.
Therefore, under a light source (AMI) of, for example, 100 mW/cm ² , a solar cell has an output capacity commensurate with the maximum number of batteries that can be stored.

In the above embodiment, a micro switch is used as the switching means, but the present invention is not limited to this, and other non-contact type photoelectric switches can also be used. Further, the mounting position of the switch using the micro switch is arranged near the electrode section on the outside of the battery holder, and is operated by the electrode section which is slightly pressed and moves outward when a battery is loaded. You can also do that.

Note that the output of the solar cell can be directly supplied to the output terminal for use, but at present, the solar cell does not have a photoelectric conversion efficiency sufficient to continuously output a predetermined potential.

[Effect of the invention] As described above, according to the portable power supply device for solar cells according to the invention, a switch means is provided for each secondary battery, and the switch means detects the battery and charges and discharges the battery. Since it is provided so as to be connected to the circuit, the output voltage can be easily changed depending on the number of batteries loaded. Furthermore, since the switch means is provided for each battery and each battery is connected in series, the output voltage is not affected no matter where the battery is loaded in the battery holder. Furthermore, there is no limit to the number of batteries that can be loaded into the battery holder; for example, four batteries can be used when charging, and two batteries can be used when discharging, which is especially convenient when carrying the battery, as it is only necessary to prepare the minimum number of batteries required. .

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram according to an embodiment of the present invention,
FIG. 2 is a schematic external perspective view. DESCRIPTION OF SYMBOLS 1... Solar cell, 2... Diode for backflow prevention, 3... Secondary battery, 4... Output terminal, 5... Switch means, 6... Battery holder part, 7... Movable part.

Claims (1)

[Claims for Utility Model Registration] 1) It has a built-in solar cell and is provided with a plurality of rechargeable batteries that can be loaded. switch means for connecting the secondary batteries in series to the solar battery and the output terminal;
A portable power supply device for solar cells, characterized in that an output voltage is set variably according to the number of secondary batteries loaded. 2) The power supply device according to claim 1, which is characterized in that a backflow prevention means is provided between the solar cell and the secondary battery. 3) The power supply device according to claim 1, wherein the switch means is provided by a microswitch whose contacts open when a secondary battery is loaded and are short-circuited when the secondary battery is not loaded.