JPS624934B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device, and more particularly, to a power supply device adapted to be floatingly charged by a solar cell.

Conventionally, storage batteries 1 and solar cells 2 have been used as power sources for low-power multiplex wireless relay stations installed in mountainous areas or uninhabited islands where it is extremely difficult to use commercial power sources, as shown in Figure 1. A power supply device in which the output from the solar cell 2 is given to the storage battery 1 via the diode 3, and the storage battery 1 is used for floating charging is widely used. However, with this type of power supply, if the solar cell fails,
Alternatively, if the required solar energy cannot be obtained due to abnormal weather, the storage battery will not only become insufficiently charged, but also become over-discharged, which will have a negative impact on the battery's properties, and should not be left unattended. In this case, the wireless line becomes disconnected and a line failure occurs.
Furthermore, in order to avoid such a situation, even if an over-discharge state of the storage battery is detected and an alarm is issued,
Since this type of power supply equipment is usually installed in locations with poor maintenance conditions, necessary measures such as charging the storage battery, replacing the storage battery, and repair cannot always be taken quickly, which can lead to line outages. It has the disadvantage that it is often

An object of the present invention is to provide a highly reliable power supply device that eliminates the above-mentioned drawbacks of conventional power supply devices. A feature of the present invention for achieving the above object is that, in a power supply device including a secondary battery and a solar cell that floatingly charges the secondary battery, over-discharge detection detects an over-discharge state of the secondary battery. a primary battery, a switch that operates in response to the detection operation of the over-discharge detector, and a self-holding operation that causes current from the primary battery to flow through the relay winding due to the operation of the switch; The present invention further includes a relay circuit that switches the power supply to the load from the secondary battery to the primary battery and reversely switches the power supply when the current becomes less than a current sufficient for holding.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 2 shows an embodiment of the power supply device according to the present invention. The power supply device 10 includes a storage battery 11 that is a secondary battery, and a solar cell 12 for floatingly charging the storage battery 11. The charging current obtained from the solar cell 12 is transferred to the storage battery via a diode 13 for preventing backflow. 11. A negative terminal of the storage battery 11 is connected to an output terminal 14, and a positive terminal of the storage battery 11 is connected to an output terminal 16 via a switching contact 15a of a relay 15. In order to detect whether or not the storage battery 11 is in an over-discharge state, an over-discharge detector 17 is connected in parallel to the storage battery 11, and when the storage battery 11 is in an over-discharge state, the over-discharge detector 1
7 is activated and closes the normally open switch 18. This normally open switch 18 has one end connected to one end of the relay winding 15b of the relay 15, and the other end connected to the output terminal 14 together with the negative terminal of an air battery 19 which is a primary battery. The positive terminal of the air battery 19 is connected to the fixed terminal a of the switching contact 15a together with the other end of the relay winding 15b. The other fixed terminal b of the switching contact 15a is connected to the positive terminal of the storage battery 11, and the switching terminal c of the switching contact 15a is connected to the output terminal 16.
It is connected to the. This switching contact 15a has terminal c connected to terminal b when relay winding 15b is deenergized, and terminal c connected to terminal a when relay winding 15b is energized. At the time of switching, it is a make-before-break contact in which terminals a and b are in a connected state until terminals a and c are connected.

According to this configuration, when the storage battery 11 is normal, that is, when it is not in an over-discharge state, the switch 18 is open and the relay winding 1
5b is not energized by the air battery 19, therefore, the switching contact 15a of the relay 15 is in a state where terminals b and c are connected, and the multiplex radio relay device 20 connected as a load is not energized. Electric power is supplied from a storage battery 11. If, for some reason,
When the storage battery 11 falls into an overdischarge state, the overdischarge detector 17 operates and closes the normally open switch 18, so a closed circuit including the air battery 19, the relay winding 15b, and the normally open switch 18 is formed. Relay 15 is energized. This normally open switch 18 is operated by the output from the overdischarge detector 17, and is also closed by the energization of the relay winding 15b. Once closed by the device 17, the relay winding 15b is then self-maintained by the air battery 19, which is a primary battery, and as a result, the relay winding 15b continues to be energized by the air battery 19. When relay 15 is energized,
Since the switching contact 15a will be connected between terminals a and c, the device 20 will be connected to the air battery 19 from now on.
Power is supplied from The switching contact 15a is
As mentioned above, since it is a make-before-break contact, when the switching contact 15a is switched, the device 2
Since the power supplied to 0 will not be interrupted momentarily,
The device 20 can maintain continuous operation even when the power source is switched. In addition, if the switching contact 15b is not a make-before-break contact, as shown by the dotted line in the figure, the diode 2
1, it is possible to prevent instantaneous interruption of power supply.

After switching to the air battery 19, if the overdischarge state of the storage battery 11 is resolved, the overdischarge detector 17 forces the normally open switch 18 into the open state, and power is supplied from the storage battery 11 again. .
In this case, since the relay 15 uses an electromagnetic relay, the switching contact 15a is
It is possible to effectively prevent chattering from occurring.

Moreover, according to such a configuration, since the relay 15 performs the switching operation using the air battery 19 as a backup power source, if the air battery 19 is naturally discharging or if the air battery 19 is used up, If this happens, power is automatically supplied from the storage battery 11 again, so it is possible to avoid the worst situation in which the device 20 becomes completely inoperable until countermeasures such as replacement of the air battery are taken. At this time, although there is a risk of over-discharge of the storage battery 11, priority is given to power supply to the device 20 in multiple wireless relay stations and the like. Furthermore, air battery 19
Even if the air battery 19 is replaced while power is being supplied by the air battery 19, when the air battery 19 is removed, it will automatically switch to the storage battery 11 based on the same principle, making the battery replacement work extremely easy. . The same applies when replacing the storage battery 11.

According to the present invention, as described above, it is possible to provide an extremely reliable power supply device, which exhibits extremely excellent effects as a power source for various electrical facilities that require high reliability.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional power supply device, and FIG. 2 is a circuit diagram showing an embodiment of the power supply device according to the present invention. 10; power supply device, 11; storage battery, 12; solar cell, 13; diode, 15; relay, 15a;
Switching contact, 15b; Relay winding, 17; Over discharge detector, 18; Normally open switch, 19; Air battery, 2
0: Multiplex wireless relay device.

Claims (1)

[Claims] 1. A power supply device equipped with a secondary battery and a solar cell that floatingly charges the secondary battery, including an over-discharge detector that detects an over-discharge state of the secondary battery, a primary battery, and the over-discharge detector. A switch that operates in response to the detection operation of the switch, and a self-holding operation that causes current from the primary battery to flow through the relay winding due to the operation of the switch, and supplies power to the load from the secondary battery to the relay winding. 1. A power supply device comprising a relay circuit that switches to a primary battery and switches the reverse when the current becomes less than a sufficient current for holding.