JPH0928041A - Solar cell power supply device - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a solar power system in which only the charging of the storage battery is interrupted by the generated voltage of the solar cell power generator or the ambient temperature of the storage battery and the power supply from the storage battery to the load is performed without interruption. It is to provide a battery power supply device. According to the present invention, a voltage comparator (6) which inputs a generated voltage of a reference voltage generator (5) and a generated voltage of a solar cell power generator (1) and outputs a comparison result of both generated voltages, and an output signal of the voltage comparator (6). A storage battery charge shutoff switch 7 for charging the storage battery 2 with the generated power of the solar cell power generator 1 is provided, and when the voltage generated by the solar cell power generator 1 is higher than the voltage generated by the reference voltage generator 5, the storage battery charge shutoff switch is opened. The container 7 is opened, and the overcharge of the storage battery 2 is prevented while continuing to supply the electric power generated by the solar cell generator 1 to the load 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar battery power supply device for connecting a solar battery power generator and a storage battery to supply power to a load.

[0002]

2. Description of the Related Art An example of a conventional solar cell power supply device is shown in FIG.
Shown in As components of this conventional example, 1 in FIG. 4 is a solar cell power generator, 2 is a storage battery, 3 is a load, 5 is a reference voltage generator, 6 is a voltage comparator, and 11 is a switch for cutting off solar cell power. , 12 are timers.

In the configuration of the conventional device, the solar cell power generator 1
Is connected to the storage battery 2 via a switch 11 for shutting off the solar cell power, and the output line of the storage battery 2 is connected to the load 3.

The output voltage signal line of the solar cell generator 1 and the signal line of the reference voltage generator 5 are connected to the voltage comparator 6, and the output signal line of the voltage comparator 6 is connected to the solar cell power via the timer 12. It is connected to the drive circuit of the breaking switch 11.

When the charging voltage is high, the storage battery 2 has a short life, and when the charging voltage is high or the ambient temperature rises, the charging current increases. This increased current further raises the temperature. Further, the temperature also rises due to the increase in the discharge current. These temperature rises eventually cause thermal escape and damage. The storage battery 2 has the above characteristics.

The conventional solar cell power supply device configured as described above operates as follows. Electric power is constantly supplied to the load 3 by the solar cell power generator 1 and the storage battery 2 without any interruption. Switch for shutting down solar cell power 1
When 1 is closed, the generated power of the solar cell power generator 1 is being supplied to the load 3, and when the amount of power generated by the solar cell power generator 1 is greater than the amount of consumption of the load 3, the storage battery 2 is charged and the solar cell power generation is performed. When the power generation amount of the device 1 is less than the consumption amount of the load 3, the storage battery 2 is discharged.

At this time, when the voltage generated by the solar cell generator 1 increases due to an increase in the amount of solar radiation and a decrease in the load 3 and becomes higher than the voltage of the reference voltage generator 5, the voltage comparator 6 sends a signal to the timer 12. To do. The timer 12 opens the switch 11 for shutting down the solar cell power for a certain period of time by the signal from the voltage comparator 6 to shut off the power supply from the solar cell power generator 1 to prevent overcharge of the storage battery 2.

Next, an example of a conventional charge control circuit considering the ambient temperature of a storage battery is shown in FIG. 5, those parts that are the same as those corresponding parts in FIG. 4 are designated by the same reference numerals, and a description thereof will be omitted. As components of this conventional example, 8 in FIG. 5 is temperature detecting means, 9 is a temperature setter, 10 is a temperature comparator, and 13 is charging means for charging the storage battery 2 and supplying electric power to the load 3. ing. The charging means 13 corresponds to, for example, the solar cell power generation device 1 and the solar cell power shutoff switch 11 in FIG. 4, but may be a charging means using a commercial power source.

In the structure of the conventional charge control circuit considering the ambient temperature of the storage battery, the power line of the charging means 13 is connected to the load 3 via the storage battery 2. Also, the temperature detecting means 8
2 and the signal line of the temperature setting device 9 are connected to the temperature comparator 10, and the output signal line of the temperature comparator 10 is connected to the drive circuit of the charging means 13.

The conventional power supply device configured as described above operates as follows. A voltage converter is used for the charging means 13, and when there is no signal from the temperature comparator 10, a general floating voltage of the storage battery 2 is output, and the signal of the temperature detection means 8 is the case of the storage battery 2. Alternatively, when the ambient temperature becomes higher than that of the temperature setter 9 which sets a high value, the temperature comparator 10 outputs a signal to the charging means 13, and the charging means 13 slightly lowers the floating voltage described above and the charging voltage does not flow to the storage battery 2. In this way, the temperature rise of the storage battery 2 is prevented.

[0011]

[Problems to be Solved by the Invention]

[No. 1] However, in the solar cell power supply device according to the above-described conventional technique, power is supplied to the load 3 only by the storage battery 2 while the solar cell power cutoff switch 11 is open. Furthermore, since the timing at which the switch 11 for shutting down the solar cell power is closed depends on the set time of the timer 12, even if the generated voltage of the solar cell power generator 1 becomes the chargeable voltage of the storage battery 2, The switch 11 may remain open for a long time, or if the voltage generated by the solar cell power generator 1 is high when the switch 11 for shutting off the solar cell power is high, the storage battery 2 may be adversely affected.

As described above, in the conventional device, when the generated voltage of the solar cell power generator 1 is equal to or higher than the overcharge voltage of the storage battery 2, it becomes impossible to supply electric power from the solar cell power generator 1 to the load 3.
There is a drawback that the optimal control for closing the switch 11 for shutting off the solar cell power cannot be performed.

[Part 2] Further, when a charging control circuit considering the ambient temperature of the storage battery 2 is added to the solar battery power supply device according to the conventional technique, the charging means 13 is used for shutting off the solar battery power generator 1 and the solar battery power. It becomes the switch 11, but when the switch 11 for shutting down the solar cell power is opened by a signal for suppressing the charging voltage of the temperature comparator 10, the storage battery 2 is discharged and the temperature further rises.

As described above, there is a drawback that a charging control circuit considering the ambient temperature of the storage battery 2 cannot be constructed only by combining the conventional devices. The object of the present invention is to prevent overcharge of the storage battery by interrupting only the charging of the storage battery by the generated voltage of the solar cell power generator or the ambient temperature of the storage battery, and by performing the power supply from the storage battery to the load without interruption. An object of the present invention is to provide a solar battery power supply device that can effectively supply the generated power of the solar battery power generator to the load and the storage battery and continuously supply power to the load.

[0015]

In order to achieve the above object, the present invention is, firstly, to provide a solar cell power generator for generating power by using light as an input, and a storage battery for charging and discharging power generated by the solar cell power generator. In the solar cell power supply device for supplying the electric power to the load, a reference voltage generator that generates a voltage at which the storage battery is overcharged, a generated voltage of the reference voltage generator, and a generated voltage of the solar cell power generator are input. Then, a voltage comparator that outputs a comparison result of both generated voltages, and a storage battery charge shutoff switch that charges the storage battery with the generated power of the solar cell power generator according to the output signal of the voltage comparator,
When the generated voltage of the solar cell power generator is higher than the generated voltage of the reference voltage generator, the storage battery charge cutoff switch is opened, while continuously supplying the generated power of the solar cell power generator to the load, It is designed to prevent overcharge.

Secondly, in a solar cell power generation device for generating power by using light as an input and a solar cell power supply device for supplying power from a storage battery for charging / discharging generated power of the solar cell power generation device to a load, Temperature detection means for detecting a case or ambient temperature, a temperature setter for setting a high value of the case or ambient temperature of the storage battery, and a signal of the temperature detection means and a signal of the temperature setter are input to compare both signals. A temperature comparator that outputs the result to the switch for shutting off the charge of the storage battery is provided, and the switch for shutting off the charge of the storage battery is opened when the case or ambient temperature of the storage battery is higher than the set temperature of the temperature setter. The temperature rise of the storage battery is prevented while continuously supplying the generated electric power to the load.

Thirdly, in the first or second solar cell power supply device, there is provided an uninterruptible storage battery power supply means for supplying the power of the storage battery to the load without any interruption, and When the amount of power supply is insufficient, the power from the storage battery is supplied to the load without interruption regardless of the operation of the switch for shutting off the charge of the storage battery.

[Operation] In the solar cell power supply device according to the above means, the present invention provides a reference voltage generator for generating a voltage that causes an overcharge of a storage battery, a voltage generated by the reference voltage generator, and a solar cell power generator. A voltage comparator that inputs the generated voltage and outputs the comparison result of both generated voltages, and a storage battery charge cutoff switch that charges the storage battery with the generated power of the solar battery power generator according to the output signal of the voltage comparator are provided. Therefore, during the period in which the voltage generated by the solar cell power generator becomes the overcharge voltage of the storage battery, the charging of only the storage battery is interrupted and the power generated by the solar cell power generator is supplied to the load to enable the power generated by the solar cell power generator to be effective. Available for

The present invention is also directed to a temperature detecting means for detecting the case or ambient temperature of the storage battery, a temperature setter for setting a high temperature value of the case or ambient temperature of the storage battery, a signal of the temperature detecting means and the temperature setter. By providing a temperature comparator that inputs the signal of the above and outputs the comparison result of both signals to the switch for shutting off the charge of the storage battery, the high temperature of the storage battery case or the ambient temperature shuts off the charge of only the storage battery, It is possible to prevent the temperature rise of the storage battery as much as possible without providing a charging means dedicated to the charging control circuit in consideration of the temperature.

Further, according to the present invention, by providing an uninterruptible storage battery power supply means for supplying the electric power of the storage battery to the load without any instantaneous interruption, it is possible to continuously supply electric power to the load from the solar cell generator and the storage battery.

Further, since the chargeable voltage of the storage battery can be grasped without depending on the timer, the charge control of the storage battery can be optimized.
With the conventional technology, a timer and a switch for shutting off the solar cell power are omitted, and a switch for shutting off the storage battery charge and a non-instantaneous storage battery power supply means are provided so that the voltage generated by the solar cell power generation device is overcharged during the storage battery. The difference is that the power generated by the solar cell generator is supplied to the load and the storage battery is charged in the optimum chargeable period.

Further, by making the charging means a solar cell power generator, a switch for shutting off the charge of the storage battery, and a means for supplying power to the storage battery without interruption, there is no need to provide a dedicated voltage converter as the charging means in consideration of the ambient temperature of the storage battery. The difference is that the temperature rise of the storage battery is prevented as much as possible and the storage battery is charged in the optimum chargeable period.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. An example of an embodiment of the present invention is shown in FIG. 1, those parts which are the same as those corresponding parts in FIGS. 4 and 5 are designated by the same reference numerals, and a description thereof will be omitted.

As components of this embodiment, 4 in FIG. 1 is a non-interruptible storage battery power supply means, 7 is a switch for shutting off the storage battery charge, and a diode is used as the non-interruption storage battery power supply means 4. A relay was used as the switch 7 for shutting off the storage battery charge, and a 12V sealed lead storage battery was used as the storage battery 2.

The above parts are connected as follows.
The power line of the solar cell generator 1 is connected to the load 3. In addition, the power line of the storage battery 2 is connected to the solar cell power generation device 1 via the storage battery charge cutoff switch 7, and the power line of the storage battery 2 is connected to the load 3 via the non-instantaneous storage battery power supply means 4. There is. Further, the output voltage signal line of the solar cell power generation device 1 and the signal line of the reference voltage generator 5 are connected to a voltage comparator 6, and the output signal line of this voltage comparator 6 is a drive circuit of a switch 7 for shutting down the storage battery charge. It is connected to the.

The solar cell power supply device of the embodiment configured as described above operates as follows. The generated power of the solar cell power generator 1 is always supplied to the load 3, and when the amount of power generation of the solar cell power generator 1 is less than the consumption amount of the load 3, the shortage occurs from the storage battery 2 via the non-interruption storage battery power supply means 4. Minutes are discharged to the load 3.

In this manner, the power supply to the load 3 is always supplied by the storage battery power supply means 4 regardless of the state of the switch 7 for shutting off the charge of the storage battery, by the solar cell generator 1 and the storage battery 2 without any interruption. Has been done.

The charging control of the storage battery 2 by the voltage generated by the solar cell power generator 1 is performed as follows. When the generated voltage of the solar battery power generation device 1 increases due to an increase in the amount of solar radiation and a decrease in the load 3 and becomes higher than the set voltage of the reference voltage generator 5 of 14.8 V, the switch 7 for shutting down the storage battery charge is switched from the voltage comparator 6. The power supply from the solar cell power generator 1 is cut off by the signal of 1 to prevent overcharge of the storage battery 2.

When the voltage generated by the solar battery power generator 1 becomes lower than the set voltage of the reference voltage generator 5 of 14.8 V, the switch 7 for shutting off the charging of the storage battery is closed by the signal from the voltage comparator 6, and the solar battery power generator 1 is closed. The storage battery 2 is charged.

The set voltage of the reference voltage generator 5 is 14.8 V, which is the same as the conventional one, and it is not necessary to newly set the set voltage for each storage battery by the configuration of the present invention. Further, another example of the embodiment of the present invention is shown in FIG.

In FIG. 2, those parts which are the same as those corresponding parts in FIGS. 1, 4 and 5 are designated by the same reference numerals, and a description thereof will be omitted. The power line of the solar cell generator 1 is connected to the load 3. In addition, the power line of the storage battery 2 is connected to the solar cell power generation device 1 via the storage battery charge cutoff switch 7, and the power line of the storage battery 2 is connected to the load 3 via the non-instantaneous storage battery power supply means 4. There is. Further, the signal line of the temperature detecting means 8 and the signal line of the temperature setting device 9 are connected to the temperature comparator 10, and the temperature comparator 1
The output signal line of 0 is connected to the drive circuit of the switch 7 for shutting off the charge of the storage battery. As the temperature detecting means 8, a temperature sensor capable of measuring the temperature of the storage battery 2 is installed at a position on the side surface of the case of the storage battery 2.

The solar cell power supply device of the embodiment configured as described above operates as follows. The generated power of the solar cell power generator 1 is always supplied to the load 3, and when the amount of power generation of the solar cell power generator 1 is less than the consumption amount of the load 3, the shortage occurs from the storage battery 2 via the non-interruption storage battery power supply means 4. Minutes are discharged to the load 3.

In this way, the power supply to the load 3 is always supplied by the solar cell generator 1 and the storage battery 2 without any interruption. The charging control of the storage battery 2 based on the temperature of the storage battery 2 is performed as follows.

When the signal of the temperature detecting means 8 becomes higher than the set temperature of 40 ° C. of the temperature setter 9 which sets the high temperature value of the case of the storage battery 2, the switch 7 for shutting off the charge of the storage battery causes the temperature comparator 1
The signal from 0 opens to shut off the power supply from the solar cell power generator 1 to prevent the temperature rise due to the charging of the storage battery 2. When the signal of the temperature detecting means 8 becomes lower than the set temperature 40 ° C. of the temperature setter 9 which sets the high temperature value of the case of the storage battery 2, the storage battery charge cutoff switch 7 is closed by the signal from the temperature comparator 10 The device 1 charges the storage battery 2. The set temperature of the temperature setter 9 is 40 ° C., which is the same as the conventional one, and it is not necessary to newly set the set temperature for each storage battery by the configuration of the present invention.

In the present embodiment, the load 3 has been described as directly consuming the electric power from the solar cell power generator 1 and the storage battery 2, but the load 3 has an input through a power converter of several stages. Good.

Although the temperature measurement value of the temperature detecting means 8 has been described as the side surface of the case of the storage battery 2, the ambient temperature exhibiting substantially the same temperature characteristics as the temperature of the storage battery 2 may be used as the measurement point. Another example of a different embodiment of the present invention is shown in FIG.

In FIG. 3, those parts which are the same as those corresponding parts in FIGS. 1, 2, 4 and 5 are designated by the same reference numerals, and a description thereof will be omitted. They are connected as follows: The power line of the solar cell generator 1 is connected to the load 3. In addition, the power line of the storage battery 2 is connected to the solar cell power generation device 1 via the storage battery charge cutoff switch 7, and the power line of the storage battery 2 is connected to the load 3 via the non-instantaneous storage battery power supply means 4. There is. In addition, the output voltage signal line of the solar cell generator 1 and the reference voltage generator 5
Is connected to the voltage comparator 6, and the voltage comparator 6
The output signal line of is connected to the drive circuit of the switch 7 for shutting off the charge of the storage battery. Further, the signal line of the temperature detecting means 8 and the signal line of the temperature setting device 9 are connected to the temperature comparator 10, and the output signal line of the temperature comparator 10 is connected to the drive circuit of the switch 7 for shutting down the storage battery charge. .

The solar cell power supply device of the embodiment configured as described above operates as follows. The generated power of the solar cell power generator 1 is always supplied to the load 3, and when the amount of power generation of the solar cell power generator 1 is less than the consumption amount of the load 3, the shortage occurs from the storage battery 2 via the non-interruption storage battery power supply means 4. Minutes are discharged to the load 3.

In this way, the power supply to the load 3 is always supplied by the storage battery power supply means 4 without interruption regardless of the state of the switch 7 for shutting off the storage battery charge. Has been done.

The charging control of the storage battery 2 by the voltage generated by the solar cell power generator 1 is performed as follows. When the generated voltage of the solar battery power generation device 1 increases due to an increase in the amount of solar radiation and a decrease in the load 3 and becomes higher than the set voltage of the reference voltage generator 5 of 14.8 V, the switch 7 for shutting down the storage battery charge is switched from the voltage comparator 6. The power supply from the solar cell power generator 1 is cut off by the signal of 1 to prevent overcharge of the storage battery 2.

When the generated voltage of the solar cell generator 1 becomes lower than the set voltage 14.8V of the reference voltage generator 5, the storage battery charge shutoff switch 7 is closed by the signal from the voltage comparator 6, and the solar cell generator 1 is closed. The storage battery 2 is charged.

The charging control of the storage battery 2 according to the temperature of the storage battery 2 is performed as follows. When the signal of the temperature detecting means 8 becomes higher than the set temperature of 40 ° C. of the temperature setter 9 which sets the high temperature value of the case of the storage battery 2, the storage battery charge cutoff switch 7 is opened by the signal from the temperature comparator 10 to generate solar power. Device 1
The power supply from the battery is cut off to prevent the temperature rise due to the charging of the storage battery 2. The signal of the temperature detecting means 8 is the set temperature 40 of the temperature setter 9 which sets the high temperature value of the case of the storage battery 2.
When the temperature becomes lower than ℃, the switch 7 for shutting off the storage battery charge is closed by the signal from the temperature comparator 10 and the solar battery power generation device 1 charges the storage battery 2.

[0043]

As is apparent from the above description, according to the solar battery power supply device of the present invention, when the voltage generated by the solar battery power generator is the overcharge voltage of the storage battery, only the charging of the storage battery is shut off. Therefore, the generated power of the solar battery power generator can be supplied to the load, and the charging control of the storage battery must be controlled only by the voltage generated by the solar battery power generator, and the charging means dedicated to the charging control circuit that considers the ambient temperature of the storage battery must be provided. The temperature of the storage battery is prevented as much as possible, and the storage battery can be supplied to the load without interruption. Therefore, the generated power of the solar cell power generator can be effectively used, and the solar cell power supply device is extremely economical and highly reliable. Can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an example of an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of another example of the embodiment of the present invention.

FIG. 3 is a block diagram showing the configuration of another example different from the embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional solar cell power supply device.

FIG. 5 is a block diagram showing a configuration of a conventional charge control circuit considering the ambient temperature of a storage battery.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Solar cell power generation device, 2 ... Storage battery, 3 ... Load, 4 ... No-interruption storage battery power supply means, 5 ... Reference voltage generator, 6 ... Voltage comparator, 7 ... Storage battery charge interruption switch, 8 ... Temperature Detecting means, 9 ... Temperature setting device, 10 ... Temperature comparator, 11 ... Solar cell power interruption switch, 12 ... Timer, 13 ... Charging means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shiro Torikoshi 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (3)

[Claims] 1. A solar cell power generation device that generates electric power using light as an input, and a solar cell power supply device that supplies electric power from a storage battery that charges and discharges generated power of the solar cell power generation device to a load, wherein the storage battery is overloaded. A reference voltage generator that generates a voltage for charging, a voltage comparator that inputs the generated voltage of the reference voltage generator and the generated voltage of the solar cell power generator, and outputs a comparison result of both generated voltages, and the voltage comparison A switch for shutting down the storage battery charge that charges the storage battery with the generated power of the solar cell power generator according to the output signal of the power generator, and the storage battery when the generated voltage of the solar cell power generator is higher than the generated voltage of the reference voltage generator. Opening a switch for shutting off charge, and preventing overcharge of the storage battery while continuing to supply the power generated by the solar cell power generator to the load. Supply device. 2. A solar cell power generation device that generates electric power using light as an input, and a solar cell power supply device that supplies electric power from a storage battery that charges and discharges generated power of the solar cell power generation device to a load. Alternatively, a temperature detection means for detecting the ambient temperature, a temperature setter for setting a high temperature value of the case or the ambient temperature of the storage battery, a signal of the temperature detection means and a signal of the temperature setter are inputted, and a comparison result of both signals is inputted. Is provided with a temperature comparator for outputting to the storage battery charge cutoff switch, and when the storage battery case or ambient temperature is higher than the set temperature of the temperature setter, the storage battery charge cutoff switch is opened. A solar cell power supply device for preventing a temperature rise of the storage battery while continuing to supply the generated power to the load. 3. The solar cell power supply device according to claim 1, further comprising a non-interruptible storage battery power supply means for supplying the power of the storage battery to the load without any interruption, A solar cell power supply device characterized in that, when the amount of power supply is insufficient, the power from the storage battery is supplied to the load without interruption regardless of the operation of the storage battery charge cutoff switch.