JPH043559Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an improvement of a solar battery power supply device in which a plurality of loads having different rated voltages are connected to the output side of a secondary battery charged by a solar battery.

"Prior Art" The configuration of this type of power supply device will be exemplarily explained with reference to FIG. Secondary batteries connected in parallel to the output side via contacts 4 are configured to accumulate and charge the electromotive force generated by the solar cell 1, and supply power to loads 5a, which will be described later, at an appropriate time.

Further, a voltage sensor 6 that detects the voltage between the terminals of the secondary battery 2 is connected in parallel to the output side of the secondary battery 2, and when the secondary battery 2 is charged to the rated voltage, the contact point 4, the detection signal is sent to the contact 4.
is opened to prevent overcharging of the secondary battery 2, and when the voltage between the terminals of the secondary battery 2 decreases due to power supply from the secondary battery 2 to the load 5a, the voltage sensor 6 sends a recovery detection signal. The contact point 4 is closed and the secondary battery 2 is recharged.

In the power supply device having such a configuration, the secondary battery 2
Multiple loads 5a with different rated voltages are installed on the output side of...
When connecting, connect it to the input side of the load 5a...
It is necessary to connect a converter such as the DC-DC converter 7a, reduce the output voltage of the secondary battery 2 to a predetermined rated voltage, and obtain an output voltage corresponding to the load 5a. It didn't happen.

``Problems to be solved by the invention'' However, when a converter such as the DC-DC converter 7a is provided on the input side of the load 5a, the power consumption increases due to the power loss of the converter 7a. In addition, the capacity of the solar cell 1 must be increased in response to the increase in power consumption, which means an increase in the installation area of the solar cell 1, an increase in the size of the device, and an increase in weight. This was extremely problematic as it also led to

The technical problem to be solved by the present invention is to provide a power supply device that can stabilize the load supply voltage without using a load stabilization circuit by adding a simple control circuit. do.

``Means for Solving Problems'' In order to achieve such technical problems, the present invention has the following objectives: 1. A plurality of loads with different rated voltages; Multiple secondary batteries each capable of outputting power,
In a solar cell power supply device comprising solar cells whose charging voltages are switchable in correspondence with the load rated voltages, a detection output from a detection means for detecting which of the plurality of loads is operating; The charging voltage of the solar cell is configured to be switchable to the load rated voltage on the non-operating side based on the above, and the charging voltage from the solar cell is switched to the secondary battery side corresponding to the other load while one load is operating. We also propose a solar battery power supply device characterized in that the power can be supplied to the secondary battery side corresponding to one of the loads while the other load is in operation.

And, configuring the charging voltage of the solar cell to be switchable in correspondence with the plurality of load rated voltages means, for example, a plurality of solar cells having an output corresponding to each load rated voltage may be provided; The solar cells may be connected in series and parallel so as to obtain an output voltage corresponding to the rated load voltage, and the number of solar cells connected in series and parallel may be switched to a predetermined voltage using a changeover switch or the like.

Note that the above-mentioned one load and the other load do not necessarily refer to only a single load device, but a large number of load devices may be grouped to be classified as one load and the other load.

"Operation" According to this technical means, the charging voltage of the solar cell is configured such that only the secondary battery that is not in operation is charged, and the secondary battery that corresponds to the load that is in operation is not charged. In addition, when one load is operating, power is supplied from the solar cell only by the secondary battery corresponding to the other load whose voltage is stable.
The operating load is not affected by fluctuations in the charging current from the solar cell, and the voltage of the load can be stabilized.

Embodiments Hereinafter, preferred embodiments of the present invention will be described in detail by way of example with reference to the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this example are as follows, unless otherwise specified.
This is not intended to limit the scope of this invention, but is merely an illustrative example.

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention in which the number of series and parallel solar cell groups 11 and 12 can be switched by means of detection means for detecting whether or not each load is in operation. The explanation will focus on the differences.

The solar cell 10 is separated into two solar cell element groups 11 and 12 that output a charging voltage corresponding to the rated voltage of one load 5b, which will be described later.
5, a relay contact 13 whose other end is connected to the anode output end side and a changeover switch 14 whose other switching terminal is connected to the ground end side are connected, respectively.

Then, by opening the relay contact 13 and connecting the separation terminals 15 with the changeover switch 14, the solar cell element group 11,
12 are connected in series, and an electromotive force corresponding to the rated voltage of one load 5a is generated at the output end of the solar cell 10.

Further, by switching the changeover switch 14 to the other switching terminal side and closing the relay contact 13, the solar cell element groups 11 and 12 are connected in series, and as a result, the output terminal of the solar cell 10 is connected to the other load 5b. The electromotive force corresponding to the rated voltage will be output.

Reference numeral 16 denotes a changeover switch provided on the output side of the reverse current prevention diode 3. At one end of the changeover switch 16, there is a secondary battery 21 having an output voltage corresponding to the rated voltage of one of the loads 5a.
Secondary batteries 22 each having an output voltage matching the rated voltage of the other load 5b are connected to the other end in parallel.

The loads 5a and 5b have rated voltages of, for example, 12V and 24V, respectively, and their input sides are connected to the corresponding secondary batteries 2.
It is connected to output terminals 1 and 22.

31 is a control circuit that detects the presence or absence of operating current when the loads 5a and 5b are in operation based on signals taken out from the loads 5a and 5b. In order to switch the changeover switch 16 to the secondary battery 22 side connected to the solar cell 10 side, and also to obtain an electromotive force commensurate with the charging voltage of the secondary battery 22, the changeover switch 14 and the relay contact 13 are connected to the solar cell 10 side.
By switching the solar cell element groups 11 and 12 in parallel, the secondary battery 2 which is not in operation can be
2 is configured to perform charging, and the operating load 5
The configuration is such that the secondary battery 21 corresponding to a is not charged. (Refer to each switch position in FIG. 1) Also, while the other load 5b is in operation, the operations described above may be reversed.

According to this embodiment, when the load 5a is activated,
Since power is supplied only by the secondary battery 21 whose voltage is stable, the load 5a... is not affected by fluctuations in the charging current from the solar cell 10.
The voltage can be stabilized.

"Effects of the invention" As described above, according to the invention, it is possible to supply power to each load commensurate with its rated voltage without installing a DC-DC converter or other converter on the load input side. It is possible to reduce power consumption, reduce the installation area of solar cells, downsize the device, and reduce weight, and in particular, control a switching means for switching the number of solar cell elements in series and parallel. By making various improvements, it is possible to stabilize the load supply voltage without using a load stabilizing circuit. It has various effects such as

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram according to an embodiment of the present invention. FIG. 2 is a circuit configuration diagram showing a power supply device according to the prior art. 10...Solar cells 10, 5a, 5b...Load,
21, 22... Secondary battery, 13... Relay contact,
14, 16... changeover switch, 30, 31... control circuit.

Claims (1)

[Claims for Utility Model Registration] A plurality of loads with different rated voltages, a plurality of secondary batteries connected to each load and each capable of outputting a voltage corresponding to the load rated voltage,
In a solar cell power supply device comprising solar cells whose charging voltages are switchable in correspondence with the load rated voltages, a detection output from a detection means for detecting which of the plurality of loads is operating; The charging voltage of the solar cell is configured to be switchable to the load rated voltage on the non-operating side based on the above, and the charging voltage from the solar cell is switched to the secondary battery side corresponding to the other load while one load is operating. , and is configured to be able to supply power to the secondary battery side corresponding to said one load while the other load is in operation.