JP2012023874A - Charging control device and power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charging control device and a power supply system capable of extending the life of a rechargeable battery.SOLUTION: A charging control device 2 is connected with a solar battery 1 and a rechargeable battery 3. A control section 24 of the charging control device 2 calculates the residual quantity of the rechargeable battery 3 by a voltage detected by a voltage detection section 22 and acquires weather forecast information from an information center 16, etc. In the case that the residual quantity of the rechargeable battery 3 is equal to or larger than a predetermined amount, and the case that the following day weather forecast information is fine weather even when the residual quantity is less than the predetermined amount, a decision on whether charging to the rechargeable battery 3 is conducted or not is deferred to the following day without charging.

Description

  The present invention relates to a charge control device and a power supply system.

  Some electronic devices that are set outdoors include a combination of a solar battery and a rechargeable battery (secondary battery) as a power source. This type of electronic device is operated by the power of the solar battery during sunny days when the amount of power generated by the solar battery is large, and the rechargeable battery is charged by the surplus power. Moreover, it operates with the electric power charged in the rechargeable battery at night or when it is raining when electric power cannot be obtained from the solar battery.

JP-A-01-050723 JP 2000-125407 A

  In the electronic device described above, the rechargeable battery is charged when it is sunny or cloudy. Therefore, when a sunny or cloudy day continues, the rechargeable battery is repeatedly charged and discharged in a state close to full charge. However, in general, it is said that a rechargeable battery has a shorter life if it is in a state near full charge for a long period of time. Further, it is said that the rechargeable battery is deteriorated as the number of times of charging is increased, and the life is shortened.

  In view of the above, an object is to provide a charge control device and a power supply system that can extend the life of a rechargeable battery.

  According to one aspect, the voltage detection unit for detecting the voltage of the rechargeable battery, and weather forecast information including information on whether or not the next day is fine weather, and the rechargeable battery from the voltage detection result by the voltage detection unit A control unit that determines whether or not to charge the rechargeable battery based on the remaining amount of the rechargeable battery and the weather forecast information, and the sun according to a determination result of the control unit There is provided a charging control device including a charging circuit unit that supplies output power of a battery to the rechargeable battery and charges the rechargeable battery.

  In the charge control device according to the above aspect, it is determined whether or not to charge based on the remaining amount of the rechargeable battery and the weather forecast information. Thereby, the charge frequency of a rechargeable battery can be decreased and the lifetime of a rechargeable battery can be extended.

FIG. 1 is a block diagram of a power supply system according to the embodiment. FIG. 2 is a flowchart illustrating a charge determination process executed in the power supply system according to the embodiment. FIG. 3 is a diagram illustrating an example of discharge characteristics of the rechargeable battery. FIG. 4 is a diagram showing the charge determination process by the remaining amount of the rechargeable battery. FIG. 5 is a flowchart of the charging process. FIG. 6 is a flowchart of a charging process in which charging is performed while detecting whether there is an abnormality in the rechargeable battery during charging. FIG. 7 is a diagram showing the charge determination process of the first modification example with the remaining amount of the rechargeable battery.

  Hereinafter, embodiments will be described with reference to the accompanying drawings.

  FIG. 1 is a block diagram of a power supply system according to the embodiment.

  As shown in FIG. 1, the power supply system 10 according to this embodiment includes a solar cell 1, a charge control device 2, a rechargeable battery 3, and a device control device 4, via the device control device 4. Electric power is supplied to the electronic device 15. In the power supply system 10 according to the present embodiment, communication with a predetermined information center 16 is performed to acquire weather forecast information, and whether or not the rechargeable battery 3 is charged based on the weather forecast information. Make a decision.

  In the present embodiment, it is assumed that the weather forecast information includes information on whether the next day is sunny or rainy and information on the daylight hours of the day. In addition, for convenience of explanation, in the present embodiment, the weather when sufficient power (power that can operate the electronic device 15 only by power feeding from the solar cell 1) is obtained from the solar cell 1 is called sunny, and on a sunny day It shall include not only clear days but also cloudy days. Furthermore, in this embodiment, the weather when sufficient electric power cannot be obtained from the solar cell 1 is called rainy weather, and rainy days include not only rainy days but also snowy days.

  Details of each part of the power supply system 10 will be described below.

  The solar cell 1 is an element that converts light into electric power, and is formed of a semiconductor such as silicon. The output terminal of the solar cell 1 is connected to the charge control device 2 and the device control device 4. The power output from the solar cell 1 varies depending on the intensity of light. For this reason, relatively large power is output from the solar cell when it is sunny or cloudy, but little power is output when it is raining or at night.

  The rechargeable battery 3 is connected to the charge control device 2, and charging of the rechargeable battery 3 and power supply from the rechargeable battery 3 to the electronic device 15 are performed via the charge control device 2. In the present embodiment, the type of the rechargeable battery 3 is not limited. For example, a nickel / hydrogen battery, a nickel / cadmium battery, a lithium ion battery, or the like can be used.

  The charging control device 2 includes a charging circuit unit 21, a voltage detection unit 22, a current detection unit 23, and a control unit 24. The voltage detection unit 22 detects the voltage of the rechargeable battery 3. Further, the current detection unit 23 detects a charging current when charging the rechargeable battery 3.

  The control unit 24 stores information on discharge characteristics of the rechargeable battery 3 and information on power consumption per day of the electronic device 15. Then, the control unit 24 determines whether or not to charge the rechargeable battery 3 based on the information, the detection result of the voltage detection unit 22, and the weather forecast information input via the device control device 4. Decide how much charge current to use when charging. The charging circuit unit 21 controls a charging current when charging the rechargeable battery 3 based on a signal from the control unit 24.

  Further, the control unit 24 electrically connects the rechargeable battery 3 and the power supply switching unit 41 based on a connection request signal and a disconnection request signal output from the power supply switching unit 41 of the device control device 4 as described later. Connect to or disconnect from.

  The device control device 4 includes a power supply switching unit 41, a weather information control unit 42, and a communication module 43. The power supply switching unit 41 supplies electric power output from the solar cell 1 to the electronic device 15 when the output voltage of the solar cell 1 is equal to or higher than a set value (a preset value).

  Moreover, the power supply switching part 41 outputs the signal (connection request signal) which requests | requires connection with the rechargeable battery 3 to the charge control apparatus 2, when the output voltage of the solar cell 1 is lower than the above-mentioned setting value. When the rechargeable battery 3 and the power supply switching unit 41 are electrically connected by this signal, the power supply switching unit 41 electrically disconnects between the solar cell 1 and the electronic device 15, Electrical connection with the electronic device 15 is made.

  Furthermore, when the output voltage of the solar battery 1 becomes higher than the above set value, the power supply switching unit 41 outputs a signal (shutoff request signal) requesting the charge control device 2 to shut off the connection with the rechargeable battery 3. At the same time, the electronic device 15 and the solar cell 1 are electrically connected.

  The weather information control unit 42 controls the communication module 43 to communicate with the information center 16 and acquires weather forecast information from the information center 16. This weather forecast information is sent to the control unit 24 of the charging control device 2 as described above.

  FIG. 2 is a flowchart illustrating a charge determination process (determination process for determining whether or not to perform charging) executed in the power supply system 10 according to the present embodiment. Here, the charging control device 2 has a built-in clock, and the following processing is executed at a preset time. However, for example, the following processing may be executed by a specific signal sent from the information center 16.

  First, in step S11, the control unit 24 of the charge control device 2 initializes parameters. Specifically, the first operation guarantee days M and the second operation guarantee days N (where N ≦ M) are set.

  Here, the first guaranteed operation days M is a value determined by the number of days that the electronic device 15 operates even when power is not supplied from the solar cell 1, and the capacity of the rechargeable battery 3 and the power consumption of the electronic device 15 are Is set according to In the present embodiment, the first guaranteed operation period M is 5. That is, even when power is not supplied from the solar battery 1, the capacity of the rechargeable battery 3 is set on the assumption that the electronic device 15 can operate for at least 5 days by the power from the rechargeable battery 3. It shall be.

  The second guaranteed operation days N is a value determined in advance by a designer or the like according to the reliability of the weather forecast information. For example, N = M when the reliability of the weather forecast information that the next day is rainy is 0%, N = 3M / 4 when the reliability is 50%, and N when the reliability is 100%. = M / 2. Here, it is assumed that the reliability of the weather forecast information is 100% and N = 2 (rounded down).

  Next, in step S <b> 12, the control unit 24 acquires weather forecast information from the information center 16 via the weather information control unit 42 and the communication module 43 of the device control device 4. As described above, this weather forecast information includes information on whether the next day is sunny or rainy and information on the daylight hours of the day.

  Next, in step S <b> 13, the control unit 24 calculates the remaining amount of the rechargeable battery 3. The remaining amount of the rechargeable battery 3 is calculated based on the voltage of the rechargeable battery 3 detected by the voltage detection unit 22 and the discharge characteristics of the rechargeable battery 3.

FIG. 3 is a diagram showing the discharge characteristics of the rechargeable battery 3 with the amount of charge (A · h) on the horizontal axis and the voltage (V) on the vertical axis. V _L in the figure is the output lower limit value of the rechargeable battery 3, and the charge amount A _max corresponding to the output lower limit value V _L is the maximum value of the charge amount that can be released by the rechargeable battery 3, that is, the capacity of the rechargeable battery 3. Represents.

The remaining amount of the rechargeable battery 3 can be obtained as follows. That is, if the voltage of the rechargeable battery 3 detected by the voltage detector 22 is V ₁ , it can be seen that the charge amount of the rechargeable battery 3 at this time is A ₁ from the discharge characteristics of FIG. In this case, the remaining amount P of the rechargeable battery 3 is P = A _max −A ₁ .

  Information corresponding to the discharge characteristics of FIG. 3 is stored in the control unit 24 in advance, and the remaining amount of the rechargeable battery 3 is calculated using the information and the voltage detection result by the voltage detection unit 22.

  After calculating the remaining amount of the rechargeable battery 3 in this way, the process proceeds to step S14. In step S <b> 14, the control unit 24 calculates the operable days D when rainy weather continues, that is, the days in which the electronic device 15 can be operated with only the rechargeable battery 3. The operable days D are obtained by dividing the remaining amount of the rechargeable battery 3 by the power consumption per day of the electronic device 15.

  Next, the process proceeds to step S15, and the control unit 24 determines whether or not the operable days D is equal to or more than the first guaranteed operation days M. Here, when it is determined that the operable days D are equal to or more than the first guaranteed operation days M (Yes), it means that the remaining amount of the rechargeable battery 3 is sufficient. In this case, the process proceeds to step S18, and the charging process is not executed on that day, and the determination as to whether or not to charge is deferred to the next day, and the process ends.

  On the other hand, if it is determined in step S15 that the operable days D are smaller than the first guaranteed operation days M (No), the process proceeds to step S16. In step S <b> 16, the control unit 24 determines whether the operable days D is equal to or greater than the second guaranteed operation days N.

  When it is determined in step S16 that the operable days D are less than the second guaranteed operation days N (No), that is, when the remaining amount of the rechargeable battery 3 is less than 2 days (when N = 2) Control goes to step S19. In step S19, the charging process of the rechargeable battery 3 is started. Details of the charging process will be described later.

  On the other hand, if it is determined in step S16 that the operable days D are greater than or equal to the second guaranteed operation days N (Yes), the process proceeds to step S17. In step S17, the control unit 24 refers to the weather forecast information. If the weather forecast information for the next day is fine (Yes), the process proceeds to step S18, and the charging process is not executed on that day, and the determination of whether or not to charge is deferred to the next day and the process is terminated.

  If the next day's weather forecast information is not clear in step S17 (No), the process proceeds to step S19. And in step S19, the charge process of the rechargeable battery 3 is started.

  When the above-described charging determination process is represented by the remaining amount of the rechargeable battery 3, it is as shown in FIG. That is, when the remaining amount D of the rechargeable battery 3 is equal to or more than the first reference remaining amount (corresponding to the first operation guarantee days M), the determination whether or not to charge the rechargeable battery 3 is deferred to the next day. The

  In addition, when the remaining amount D of the rechargeable battery 3 is between the first reference remaining amount and the second reference remaining amount (corresponding to the second operation guarantee days N), if the weather forecast information on the next day is sunny, The decision whether or not to charge is deferred the next day. On the other hand, when the weather forecast information for the next day is rainy, the charging process for the rechargeable battery 3 is started.

  Furthermore, when the remaining amount (D) of the rechargeable battery 3 is less than the second reference remaining amount, the charging process of the rechargeable battery 3 is started regardless of the weather forecast information.

  In the present embodiment, as described above, when the remaining amount of the rechargeable battery 3 is sufficient, and when the weather forecast information on the next day is clear even when the remaining battery level is reduced to some extent, the rechargeable battery 3 is charged. Not performed. The life of the rechargeable battery 3 is shortened when the number of times of charging is large or when a state close to full charge lasts for a long time, but in this embodiment, the number of times of charging is reduced and the state close to full charge continues for a long time. Is prevented. Thereby, in this embodiment, there exists an effect that the lifetime of the rechargeable battery 3 is extended.

  In the present embodiment, when the remaining amount of the rechargeable battery 3 becomes smaller than a predetermined value (second reference remaining amount), charging is started regardless of the weather forecast information. Thereby, it is avoided that the electronic device 15 stops operating due to insufficient charging of the rechargeable battery 3.

  FIG. 5 is a flowchart of the charging process performed in step S19 of FIG.

  First, in step S <b> 21, the control unit 24 of the charging control device 2 acquires information on the daylight hours of the day from weather forecast information input via the device control device 4.

  Next, in step S <b> 22, the control unit 24 calculates a minimum value of the charging current when charging the rechargeable battery 3. Here, the minimum value of the charging current is the minimum value of the current necessary for sufficiently charging the rechargeable battery 3 within the daylight time of the day. The minimum value of the charging current is calculated from a value obtained by subtracting the remaining amount of the rechargeable battery 3 from the capacity of the rechargeable battery 3, the sunshine time, and the charging efficiency.

  Next, in step S <b> 23, the control unit 24 controls the charging circuit unit 21 to supply the current corresponding to the calculated minimum value of the charging current to the rechargeable battery 3 to charge the rechargeable battery 3. At this time, the control unit 24 detects the charging current by the current detection unit 23 and feeds back the detection result to the control of the charging circuit unit 21. In the present embodiment, the charging circuit unit 21 has a PWM (Pulse Width Modulation) circuit and adjusts the charging current by changing the duty ratio of the pulse.

  Generally, if the current at the time of charging the rechargeable battery 3 is too large, the life of the rechargeable battery 3 is shortened. However, in this embodiment, as described above, the value of the rechargeable battery 3 within the sunshine time is calculated from the value obtained by subtracting the remaining amount of the rechargeable battery 3 from the capacity of the rechargeable battery 3, the sunshine time, and the charging efficiency. The minimum current with a sufficient remaining amount is calculated, and the rechargeable battery 3 is charged with the minimum current. Thereby, the lifetime of the rechargeable battery 3 can be further extended.

  In the present embodiment, as described above, the minimum current value is calculated from the value obtained by subtracting the remaining amount of the rechargeable battery 3 from the capacity of the rechargeable battery 3, the sunshine time, and the charging efficiency. The rechargeable battery 3 may be charged with a set charging current.

  By the way, the rechargeable battery 3 eventually deteriorates by repeated charge and discharge. In this case, in order to continue the operation of the electronic device 15, processing such as generating an alarm for detecting the deterioration of the rechargeable battery 3 and prompting replacement is important.

  FIG. 6 is a flowchart of a charging process in which charging is performed while detecting the presence or absence of abnormality of the rechargeable battery 3 during charging.

  First, in step S31, the control unit 24 starts a timer that measures the charging time when charging is started. Here, it is assumed that the timer is built in the charging control device 2.

Next, the process proceeds to step S <b> 31, and the control unit 24 acquires the voltage of the rechargeable battery 3 (hereinafter referred to as “power supply voltage”) via the voltage detector 23. Then, the process proceeds to step S32, the control unit 24 checks the supply voltage whether the following preset voltage limit V _max. When the power supply voltage exceeds the voltage upper limit value V _max (No), it is considered that there is some abnormality in the rechargeable battery 3. In this case, the process proceeds to step S36, and the control unit 24 stops the charging process. And the control part 24 transmits the warning to the effect that replacement | exchange of the rechargeable battery 3 is required to the data center 16 via the communication module 43 of the apparatus control apparatus 4, for example.

On the other hand, when the power supply voltage is below the upper limit value V _max in step S33 (Yes), the process proceeds to step S34. In step S34, the control unit 24 refers to the timer and checks whether or not the time (charging time) T from the start of charging is equal to or less than a preset upper limit value T _max of the charging time. Here, when the charging time T exceeds the upper limit value T _max of the charging time (No), it is considered that the rechargeable battery 3 is deteriorated. Also in this case, the process proceeds to step S36, and the control unit 24 stops the charging process. And the control part 24 transmits the warning to the effect that replacement | exchange of the rechargeable battery 3 is required to the data center 16 via the communication module 43 of the apparatus control apparatus 4, for example.

If it is determined in step S34 that the charging time T is equal to or less than the upper limit value _Tmax (Yes), the process proceeds to step S35. In step S35, the control unit 24 determines whether or not the charging of the rechargeable battery 3 is completed. Whether or not the charging is completed is determined, for example, based on whether or not the power supply voltage has reached a predetermined value (for example, a voltage at full charge, or a voltage of 80% to 90% of the voltage at full charge). Whether or not charging is completed may be determined based on whether or not the charging voltage increase rate (ΔV / dt) has decreased to a predetermined value or less. .

  If it is determined in step S35 that charging of the rechargeable battery 3 has not been completed (No), the process returns to step S32 and the above-described processing is repeated. Moreover, when it determines with charge of the rechargeable battery 3 having been completed in step S35 (Yes), a charge process is complete | finished.

  Thus, in this embodiment, the presence or absence of abnormality (including deterioration) of the rechargeable battery 3 is determined during the charging process, and when abnormality or deterioration is detected, an alarm is generated to prompt replacement of the rechargeable battery 3. Thereby, the electronic device 15 can be continuously operated for a long time.

(Modification 1)
In the embodiment described above, the first guaranteed operation days M and the second guaranteed operation days N are set. However, the setting of the second guaranteed operation days N is not essential, and the second guaranteed operation days N may not be set. In this case, in the flowchart of FIG. 2, only the first guaranteed days M are set in step S11. Moreover, the process of step S16 becomes unnecessary.

  If the charge determination process of the modification 1 is expressed by the remaining amount of the rechargeable battery 3, it is as shown in FIG. That is, when the remaining amount D of the rechargeable battery 3 is equal to or more than the first reference remaining amount (corresponding to the operation guarantee period M of 1 again), the determination whether or not to charge the rechargeable battery 3 is deferred to the next day. The

  When the remaining amount of the rechargeable battery 3 is less than the first reference remaining amount, if the next day's weather forecast information is fine, the determination of whether or not to charge is deferred to the next day. On the other hand, when the weather forecast information for the next day is rainy, charging of the rechargeable battery 3 is started.

(Modification 2)
In the embodiment described above, the weather forecast information is acquired from the external information center 16 via communication. However, a sensor that measures atmospheric pressure, humidity, and the like may be provided in the power supply system 10 and the weather of the next day may be determined based on the measured value of the sensor. For example, when the atmospheric pressure measured by the atmospheric pressure sensor is higher than a set value, the weather forecast information for the next day may be set as fine weather, and it may be determined whether or not to charge the rechargeable battery 3 based on the weather forecast information.

(Modification 3)
The discharge characteristics of the rechargeable battery 3 vary depending on the number of charge / discharge cycles. Therefore, the relationship between the discharge characteristics of the rechargeable battery 3 and the number of times of charging is examined in advance, and a counter for counting the number of times of charging is provided in the charging control device 2 so that the discharging characteristics are corrected according to the number of times of charging. Also good. Thereby, the remaining amount of the rechargeable battery 3 can be obtained more accurately.

  The following additional notes are disclosed with respect to the above embodiments.

(Supplementary note 1) a voltage detector for detecting the voltage of the rechargeable battery;
Obtaining weather forecast information, obtaining a remaining amount of the rechargeable battery from a voltage detection result by the voltage detector, and charging the rechargeable battery based on the remaining amount of the rechargeable battery and the weather forecast information A control unit for determining whether or not to perform;
A charging control device comprising: a charging circuit unit that supplies output power of a solar cell to the rechargeable battery according to a determination result of the control unit and charges the rechargeable battery.

  (Additional remark 2) The said control part is when the remaining amount of the said rechargeable battery is larger than the preset 1st reference | standard remaining amount, and the remaining amount of the said rechargeable battery is less than the said 1st reference | standard remaining amount. 2. The charging control device according to claim 1, wherein, even if the weather forecast information included in the weather forecast information is sunny, the determination as to whether or not to charge the rechargeable battery is deferred on the next day. .

  (Supplementary Note 3) When the remaining amount of the rechargeable battery is less than a second reference remaining amount (where the first reference remaining amount> the second reference remaining amount), the control unit The charging control device according to appendix 2, wherein the charging circuit unit is controlled regardless of information to start charging the rechargeable battery.

  (Supplementary note 4) The charge control device according to supplementary note 3, wherein the second reference remaining amount is set to a smaller value as the reliability of the weather forecast information is higher.

  (Additional remark 5) The said control part determines the charging current when charging the said rechargeable battery based on the sunshine time of the day included in the said weather forecast information, The said charging circuit part is the charge determined by the said control part The charge control device according to any one of appendices 1 to 4, wherein the rechargeable battery is charged with an electric current.

  (Additional remark 6) The said control part monitors the voltage or the charging time when charging the said rechargeable battery, and determines the presence or absence of the abnormality of the said rechargeable battery, The charge control apparatus of Additional remark 1 characterized by the above-mentioned. .

(Appendix 7) a solar cell that receives light and generates electric power;
A rechargeable battery for storing the power generated by the solar cell;
A charge control device for controlling charging of the rechargeable battery,
The charge control device includes:
A voltage detector for detecting the voltage of the rechargeable battery;
Obtaining weather forecast information, obtaining a remaining amount of the rechargeable battery from a voltage detection result by the voltage detector, and charging the rechargeable battery based on the remaining amount of the rechargeable battery and the weather forecast information A control unit for determining whether or not to perform;
A power supply system comprising: a charging circuit unit that supplies output power of the solar cell to the rechargeable battery according to a determination result of the control unit and charges the rechargeable battery.

  (Additional remark 8) Furthermore, it has the apparatus control apparatus which is connected to the said solar cell and supplies electric power to an electronic device, and the said apparatus control apparatus uses the said charging control apparatus when the output of the said solar cell is less than a setting value. The power supply system according to appendix 7, wherein electric power output from the rechargeable battery is supplied to the electronic device.

  (Supplementary note 9) The power supply system according to supplementary note 8, wherein the device control apparatus includes a communication module that communicates with a predetermined information center to acquire the weather forecast information.

  DESCRIPTION OF SYMBOLS 1 ... Solar cell, 2 ... Charge control apparatus, 3 ... Rechargeable battery, 4 ... Equipment control apparatus, 10 ... Power supply system, 15 ... Electronic equipment, 16 ... Information center, 21 ... Charging circuit part, 22 ... Voltage detection part, DESCRIPTION OF SYMBOLS 23 ... Current detection part, 24 ... Control part, 41 ... Power supply switching part, 42 ... Weather information control part, 43 ... Communication module.

Claims (6)

A voltage detector for detecting the voltage of the rechargeable battery;
Obtaining weather forecast information, obtaining a remaining amount of the rechargeable battery from a voltage detection result by the voltage detector, and charging the rechargeable battery based on the remaining amount of the rechargeable battery and the weather forecast information A control unit for determining whether or not to perform;
A charging control device comprising: a charging circuit unit that supplies output power of a solar cell to the rechargeable battery according to a determination result of the control unit and charges the rechargeable battery.   The control unit is configured such that the remaining amount of the rechargeable battery is greater than a preset first reference remaining amount, and the remaining amount of the rechargeable battery is less than the first reference remaining amount. 2. The charging control apparatus according to claim 1, wherein when the next day's weather included in the weather forecast information is fine, the determination as to whether or not to charge the rechargeable battery is deferred to the next day.   When the remaining amount of the rechargeable battery is less than a second reference remaining amount (where the first reference remaining amount> the second reference remaining amount), the control unit is irrelevant to the weather forecast information. The charging control device according to claim 2, wherein the charging circuit unit is controlled to start charging the rechargeable battery.   The charging control device according to claim 3, wherein the second reference remaining amount is set to a smaller value as the reliability of the weather forecast information is higher.   The control unit determines a charging current when charging the rechargeable battery based on the daylight time of the day included in the weather forecast information, and the charging circuit unit is charged with the charging current determined by the control unit. The charge control device according to claim 1, wherein the battery is charged. A solar cell that generates light by receiving light;
A rechargeable battery for storing the power generated by the solar cell;
A charge control device for controlling charging of the rechargeable battery,
The charge control device includes:
A voltage detector for detecting the voltage of the rechargeable battery;
Obtaining weather forecast information including information on whether or not the next day is fine weather, obtaining the remaining amount of the rechargeable battery from the voltage detection result by the voltage detection unit, the remaining amount of the rechargeable battery and the weather forecast information, A control unit for determining whether to charge the rechargeable battery based on
A power supply system comprising: a charging circuit unit that supplies output power of the solar cell to the rechargeable battery according to a determination result of the control unit and charges the rechargeable battery.

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