JPH062443Y2 - Charger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a charging device for charging a storage battery using a solar cell. [Prior art and its problems] Conventionally, charging a storage battery using a solar battery Various charging devices are known, but in the case of a charging method that detects the voltage of the storage battery and short-circuits the solar cell with an overcharge prevention circuit, the storage battery voltage will not necessarily be charged to the full charge state because it varies depending on conditions such as temperature. There is. Therefore, a device as shown in FIG. 3 has been proposed as a method for ideally charging a storage battery. (Actual publication No. 60-3642) In FIG. 3, 1, 1'is a solar cell, 2 is a storage battery, 3 is a load, 4, 4'is a diode, 5, 5'is an overcharge prevention circuit, and 6 is an overcharge. Sometimes, the switch for short-circuiting the solar cell 1 and 6'denotes a switch for short-circuiting the solar cell 1'when overcharged.

With such a configuration, the solar cell 1'is first short-circuited at a constant voltage value of the storage battery 2, and the remaining solar cell 1 intermittently charges the storage battery 2 at a low current to perform ideal charging at the end of charging.

However, in the case of such a device, comparing the switches 6 and 6 ', the switch 6 operates from the beginning to the end,
The switches 6, 6'have different lifespans. In particular, in the case of a solar battery power supply device installed outdoors, if the life of the switch varies, maintenance of the switch becomes necessary.

The present invention has been made in view of the above points, and an object thereof is to provide a charging device that is easy to maintain as a solar battery power supply device by making the switch life uniform.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention comprises a plurality of solar cells and a storage battery that charges the power of the solar cells, and a charging device that switches the number of solar cells to be charged to the storage batteries according to different battery voltages of the storage batteries. In the above, the operation of the switches respectively connected between the plurality of solar cells and the storage battery and the order of restoration are performed in the same order to control charging of the storage battery.

[Action]

By configuring as described above, the present invention enables ON / OFF of the switches provided between the plurality of solar cells and the storage cells to be performed in the same order according to the state of charge of the storage cells that charge the generated power of the solar cells. Since the number of ON-OFF operations of each switch is made uniform, the switch life is also made uniform.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a charging device of the present invention.
FIG. 2 is a graph showing the operating range of each switch.

In the figure, 11a to 11c are solar cells, 12 is a storage battery, and 13 is a storage battery.
Is a load, 14 is a backflow prevention diode, 15 is a voltage sensor for detecting the state of charge of the storage battery 12, and 16a to 16c are solar cells 11
A switch for turning on and off between a to 11c and the storage battery 12, 17 is a switch 16a depending on the detection voltage detected by the voltage sensor 15.
This is a control circuit for controlling ON / OFF of 16c.

FIG. 2 is a graph showing the operating ranges of the switches 16a to 16c, where A is the switch 16a, B is the switch 16b, and C is the switch 16c. As shown in the figure, the operating ranges of the switches A, B, C are different depending on the level of the voltage V of the storage battery 12, and the ranges shown by the solid line in the graph are that the switches A, B, C are ON. Solar battery power is storage battery 12
Are charged, and the switches A, B, and C are turned off in a range outside the range shown by the solid line, that is, in the upper and lower ranges.

Since the present invention is configured as described above, the switch ON-OFF sequence is C (ON) → B (ON) → A (ON) until the state of charge reaches full charge.
→ A (OFF) → C (OFF), and each switch A, B, C has the same number of times O
N-OFF operation will be performed.

[Effect of device]

As described above, according to the present invention, the switches are configured so that each switch works under the same conditions depending on the charging state of the storage battery, so that the switch life is uniform and the charging device is maintained. This makes it easier and enables ideal charging.

[Brief description of drawings]

FIG. 1 is a block diagram showing a charging device of the present invention.
FIG. 2 is a graph showing the operating range of each switch. FIG. 3 is a block diagram showing a conventional charging device. 1,1 ′, 11a, 11b, 11c …… Solar cell 2,12 …… Storage battery 16a, 16b, 16c …… Switch

Claims (1)

[Scope of utility model registration request] 1. A charging device comprising a plurality of solar cells and a storage battery for charging electric power of the solar cells, wherein the number of the solar cells to be charged to the storage batteries is switched according to different battery voltages of the storage batteries. A charging device, characterized in that the operation of the switches connected between the battery and the storage battery and the order of restoration are set to the same order to control charging of the storage battery.