JP2000270493A - Charging period discriminator, electronic equipment, charging period discriminating method, and control method for electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform discrimination of charging period, without being influenced by the dispersion of quality in every battery and the deterioration of batteries. SOLUTION: A secondary battery 20 is made to perform pulse discharging via a load resistor at every preset time, and the voltage of the secondary battery 220 before pulse discharging and during pulse discharge is detected, and based on this detected voltage, the internal resistance of the secondary battery 220 is computed, and the charging period voltage which is the voltage of the secondary battery equivalent to the period to perform charging is discriminated, so that when the voltage under this charging period voltage is detected, it can be made the period to perform charging without fail, therefore the charge period can be discriminated accurately with a simple constitution, without being influenced by increase in the internal resistance accompanying the dispersion of quality by every battery and the deterioration. As a result, a user can be accurately informed of charging timing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging timing discriminating apparatus, an electronic device, a charging timing discriminating method, and a control method of an electronic device, and more particularly to a charging timing for discriminating a timing to charge a portable electronic device. The present invention relates to a determination device, a charging timing determination method, an electronic device including the charging timing determination device, and a control method thereof.

[0002]

2. Description of the Related Art In recent years, small portable electronic devices (= charged electronic devices) such as portable terminals and electronic timepieces are housed in chargers called stations, and the portable electronic devices are configured to be charged. It has been known. In such a configuration, in the small portable electronic device, as a power storage device for storing the charged electric energy, for example,
A secondary battery such as a lithium ion secondary battery is provided. As an example of a method for determining the charging time of the secondary battery, there are the following two methods.

[1] First Conventional Example In the first conventional example, a battery voltage is monitored, and a time when the battery voltage becomes equal to or lower than a predetermined reference voltage is set as a charging time to be charged. [2] Second Conventional Example According to the technology described in Japanese Patent Application Laid-Open No. 4-364489 as a second conventional example, as shown in FIG. 7, the secondary battery has a high discharge depth (close to 100%) as shown in FIG. ), The discharge is performed periodically (for example, every 5 seconds) by utilizing the fact that the internal resistance increases and the amount of voltage drop generated at the time of heavy load (for example, rapid discharge) increases. The amount of voltage drop, which is the difference between the voltage of the battery before and after the battery is discharged, is detected, and the time when the detected amount of voltage drop becomes equal to or more than a predetermined reference drop amount is defined as the charging timing.

[0004]

In the above-mentioned first conventional example, it is not possible to accurately judge the charging timing when there is variation among the batteries or when the internal resistance increases due to the deterioration of the batteries. There was a problem. More specifically, like the batteries corresponding to the waveforms a and c shown in FIG. 8, the voltage values in the initial state are the same, but when the internal resistance value increases due to the deterioration of the battery, , The amount of voltage drop during discharge increases as shown by waveform c,
The voltage may be lower than the operation allowable voltage of the electronic device, and the electronic device may not operate stably. Further, in the second conventional example, when the internal resistance value increases due to the deterioration of the battery,
Since the amount of voltage drop becomes large, there is a problem that the charging timing cannot be accurately determined. More specifically, in the case of the battery as shown by the waveform b in FIG. 8, the determination can be made accurately. However, in the case of the battery as shown by the waveform d, although the battery has a sufficient battery voltage, Instead, it was determined that it was time to charge. Therefore, an object of the present invention is to provide a charging time discriminating apparatus, an electronic device, a charging time discriminating method, and a control method for an electronic device that can determine a charging time without being affected by variations among batteries or deterioration of batteries. It is to provide a method.

[0005]

According to a first aspect of the present invention, there is provided a charging timing determining apparatus for determining a charging timing of a power storage device which can be repeatedly charged. Discharge control means for causing the power storage device to perform pulse discharge via a load resistor at each interval; voltage detection means for detecting a voltage of the power storage device before and during pulse discharge; and a detected voltage of the power storage device And an internal resistance calculating means for calculating an internal resistance value of the power storage device, and determining a charging timing voltage which is a storage voltage of the power storage device corresponding to a time when the charging should be performed based on the calculated internal resistance value. Charge timing voltage determining means,
It is characterized by having.

According to a second aspect of the present invention, in the configuration of the first aspect, a voltage monitoring means for monitoring a storage voltage of the power storage device, and a storage voltage of the power storage device based on a monitoring result of the voltage monitoring means. And a charge notifying unit for notifying the user of charging when the voltage exceeds the charging timing voltage.

According to a third aspect of the present invention, in the first or second aspect, a temperature detecting means for detecting a temperature around the power storage device, and the internal resistance value is corrected based on the detected temperature. And a resistance value correcting unit that performs the correction.

According to a fourth aspect of the present invention, there is provided a charging timing determining device for determining a charging timing of a power storage device capable of repeatedly charging, wherein a pulse is supplied to the power storage device via a load resistor at predetermined time intervals. Discharge control means for performing discharge, voltage detection means for detecting the voltage of the power storage device before and during pulse discharge, and, based on the detected voltage of the power storage device, the power storage device at the time of the pulse discharge. A voltage drop amount calculating means for calculating a voltage drop amount, and a charge timing voltage for determining a charge timing voltage drop amount which is a voltage drop amount of the power storage device corresponding to a timing at which the charge should be performed based on the calculated voltage drop amount. And a descent amount determining means.

According to a fifth aspect of the present invention, in the configuration of the fourth aspect, voltage monitoring means for monitoring a storage voltage of the power storage device, and pulse discharge of the power storage device based on a monitoring result of the voltage monitoring means. Charge notification means for notifying the user of charging when the voltage drop amount at the time exceeds the charge timing voltage drop amount.

According to a sixth aspect of the present invention, in the configuration of the fourth or fifth aspect, a temperature detecting means for detecting a temperature around the power storage device, and a voltage at the time of the pulse discharge based on the detected temperature. And a descent amount correcting means for correcting the descent amount.

According to a seventh aspect of the present invention, there is provided a power storage device capable of being repeatedly charged, and a charging timing determining device according to any one of the first to sixth aspects.

[0012] According to an eighth aspect of the present invention, in the configuration of the seventh aspect, based on one of an internal resistance value of the power storage device and a voltage drop amount of the power storage device and an actual storage voltage of the power storage device. It is characterized by comprising an operation state control means for controlling an operation state of the electronic device.

According to a ninth aspect of the present invention, in the configuration of the eighth aspect, the operating state control means is configured to control an internal resistance value of the power storage device or a voltage drop amount of the power storage device and a control state of the operation state. An operation state control storage unit for storing the relationship in advance is provided.

According to a tenth aspect of the present invention, in the configuration of the eighth or ninth aspect, the operating state control means is configured to load one or a plurality of loads predetermined according to an actual storage voltage of the power storage device. A heavy-load drive prohibiting means for prohibiting driving is provided.

According to a eleventh aspect of the present invention, in the charging timing determining method for determining the charging timing of the power storage device that can be repeatedly charged, a pulse is transmitted to the power storage device via a load resistor at predetermined time intervals. A discharging step of causing discharge, a voltage detecting step of detecting a voltage of the power storage device before and during pulse discharge, and calculating an internal resistance value of the power storage device based on the detected voltage of the power storage device. An internal resistance calculating step, and a charging timing voltage determining step of determining a charging timing voltage that is a storage voltage of the power storage device corresponding to a timing at which the charging should be performed based on the calculated internal resistance value. And

According to a twelfth aspect of the present invention, in the charging timing determination method according to the eleventh aspect, a voltage monitoring step of monitoring a storage voltage of the power storage device, and the power storage device based on a monitoring result in the voltage monitoring step. And a notification step for issuing a notification for prompting charging when the stored voltage of the battery exceeds the charging timing voltage.

According to a thirteenth aspect of the present invention, in the configuration of the eleventh or twelfth aspect, a temperature detecting step of detecting a temperature around the power storage device and correcting the internal resistance value based on the detected temperature. And a resistance value correcting step.

According to a fourteenth aspect of the present invention, in the charging timing determining method for determining a charging timing of a power storage device capable of repeatedly charging, a pulse is supplied to the power storage device via a load resistor at predetermined time intervals. A discharge control step of performing discharge, a voltage detection step of detecting a voltage of the power storage device before pulse discharge and during pulse discharge, and, based on the detected voltage of the power storage device, the power storage device during the pulse discharge. A voltage drop amount calculating step of calculating a voltage drop amount, and a charging timing voltage for determining a charging timing voltage drop amount which is a voltage drop amount of the power storage device corresponding to a timing at which the charging should be performed based on the calculated voltage drop amount. And a descending amount determining step.

According to a fifteenth aspect of the present invention, in the configuration of the fourteenth aspect, a voltage monitoring step of monitoring a storage voltage of the power storage device, and a pulse discharge of the power storage device based on a monitoring result in the voltage monitoring step. A charge notification step of giving a notification for prompting charging when the voltage drop amount at the time exceeds the charge timing voltage drop amount.

According to a sixteenth aspect of the present invention, in the configuration of the fourteenth or fifteenth aspect, a temperature detecting step of detecting a temperature around the power storage device; and a voltage at the time of the pulse discharge based on the detected temperature. And a descent amount correcting step of correcting the descent amount.

According to a seventeenth aspect of the present invention, in the method for controlling an electronic device comprising a power storage device capable of repeatedly charging and a charging timing determining device according to any one of the first to sixth aspects, An operating state control step of controlling an operating state of the electronic device based on one of an internal resistance value of the power storage device and a voltage drop amount of the power storage device and an actual storage voltage of the power storage device. I have.

According to a eighteenth aspect of the present invention, in the configuration of the seventeenth aspect, the operation state control step includes controlling the internal resistance value of the power storage device or the voltage drop amount of the power storage device and the operation state stored in advance. The operation state is controlled based on the relation with the state.

According to a nineteenth aspect of the present invention, in the configuration of the eighteenth aspect, the operation state control step is performed by the power storage device having one or a plurality of loads predetermined according to an actual storage voltage of the power storage device. A heavy-load drive prohibition step of prohibiting driving is provided.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the drawings. In the present embodiment,
Although a station is taken as an example of a charging device and an electronic timepiece is taken as an example of an electronic device having a power storage device, the present invention is not limited to these. [1] Mechanical Configuration FIG. 1 shows a plan view of a station and an electronic timepiece according to the embodiment. As shown in FIG. 1, the electronic watch 200
When performing charging, data transfer, and the like, it is housed in the recess 101 of the station 100. Since the concave portion 101 is formed in a slightly larger shape than the main body 201 and the band 202 of the electronic timepiece 200, the timepiece main body 201 is accommodated in a state positioned with respect to the station 100. In addition, the station 100, the charging and start button 103 ₁ for instructing the start of charging, with various input unit such as a transfer start button 103 ₂ for instructing the start of data transfer, for performing various displays Display unit 10
4 are provided. Note that the electronic timepiece 200 according to the present embodiment is worn on the user's arm in a normal use state and displays the date and time on the display unit 204. Needless to say, the pulse rate and the It is configured to detect and store biological information such as heart rate at regular intervals.

FIG. 2 is a sectional view taken along line AA in FIG. As shown in the figure, a watch side coil 210 for data transfer and charging is provided on a lower back cover 212 of a main body 201 of an electronic timepiece via a cover glass 211. Further, the watch main body 201 is provided with a circuit board 221 connected to the secondary battery 220, the watch side coil 210, and the like. On the other hand, in the recess 101 of the station 100, a station-side coil 110 is provided via a cover glass 111 at a position facing the clock-side coil 210. The station 100 has a coil 110, a charge start button 103 ₁ , a transfer start button 10 ₁
3 _2, the display unit 104, a circuit board 121 that is connected to such primary source (not shown) is provided. in this way,
In a state where the electronic timepiece 200 is housed in the station 100, the station-side coil 110 and the watch-side coil 210 are not physically in contact with each other due to the cover glasses 111 and 211. In effect, they are in a connected state. The station-side coil 110 and the clock-side coil 210 each have an air core that does not have a magnetic core for reasons such as avoiding magnetization of the clock mechanism, avoiding an increase in weight on the clock side, and avoiding exposure of magnetic metal. It is a type. Therefore, when applying to electronic devices where this is not a problem,
A coil having a magnetic core may be employed. However, if the signal frequency given to the coil is sufficiently high, the air-core type is sufficient.

[2] Schematic Configuration of Electronic Timepiece Next, a schematic configuration of a main part of the electronic timepiece 200 will be described. The electronic timepiece 200 includes a clock-side coil 210 that receives electric energy from the station 100 by electromagnetically coupling with the station-side coil 110, a secondary battery 220 that stores the electric energy received via the receiving coil 210, A backflow prevention diode 223 for preventing backflow of current, and a battery voltage detection circuit 22 for detecting the voltage of the secondary battery 220 and outputting voltage detection data
4, a discharge circuit 225 for discharging the secondary battery 220 via a discharge resistor (not shown) at a timing corresponding to a first pulse signal described later, and a first pulse signal P1 is output at predetermined time intervals. And a pulse generation circuit 226 that outputs a second pulse signal P2 corresponding to the sampling timing in synchronization with the first pulse signal P1.
A first register 227A that captures and holds voltage detection data output by the battery voltage detection circuit 224 immediately before discharging based on the second pulse signal P2, and a battery voltage during discharging based on the second pulse signal P2. A second register 227B that fetches and holds the voltage detection data output by the detection circuit 224, and a value of the voltage detection data corresponding to the voltage of the secondary battery 220 immediately before discharging held in the register 227A and the register 227B. A voltage drop amount calculation circuit 228 that generates and outputs voltage drop amount data corresponding to a voltage drop amount which is a difference between the values of the voltage detection data corresponding to the voltage of the secondary battery 220 being discharged; An internal resistance calculating circuit for calculating internal resistance data corresponding to the internal resistance of the secondary battery based on the amount data;
29 and a conversion table 230 for outputting various reference voltage data including charging reference voltage data for determining whether charging is necessary based on the calculated internal resistance data.
And a control circuit 23 for performing various operation controls and various display controls based on the charging reference voltage data and the voltage detection data.
1 and a display unit 232 for displaying various information under the control of the control circuit 211. In this case, as the predetermined time interval for outputting the first pulse signal P1, the deterioration of the internal resistance during storage of the secondary battery proceeds very slowly as shown in FIG.
Every four hours.

[3] Configuration of Conversion Table Here, a configuration example of the conversion table 230 will be described with reference to FIG. The conversion table 230 includes, for example, a charge warning voltage that is a voltage at which a charge warning is to be performed and a first voltage that is a voltage at which a first operation control is to be performed, for a certain internal resistance value.
An operation control voltage, a second operation control voltage which is a voltage at which the second operation control is to be performed, and a first level remaining amount display voltage to a fifth level remaining amount display which are reference voltages when the battery remaining amount is displayed in five stages. The voltage and the like are stored. More specifically,
When the value of the internal resistance is 20 (Ω), the charging warning voltage is 2.7 [V], and the voltage of the secondary battery 220 is 2.
When the voltage falls below 7 [V], a charge warning is issued.
The first operation control voltage is 2.6 volts. When the voltage of the secondary battery 220 becomes 2.6 [V] or less, for example,
Reduce the alarm drive (ring) time. Further, the second operation control voltage is 2.4 [V], and when the voltage of the secondary battery 220 becomes 2.4 [V] or less, for example, the display unit 23
For example, when an EL (Electroluminescence) display is used as 2, control is performed to reduce the drive duty. The first to fifth level remaining amount display voltages are 2.7 [V],..., 3.7.
[V] and 4.0 [V], and when the voltages are lower than the respective voltages, the user is notified of the remaining battery level by performing control such that the corresponding voltage mark is turned off.

[4] Operation of Embodiment Next, the operation of the electronic timepiece of the embodiment will be described. [4.1] During Normal Operation During normal operation, the battery voltage detection circuit 2 of the electronic timepiece 200
24 is for each predetermined sampling timing,
The voltage of the secondary battery 220 is detected by sampling, and the voltage detection data is detected by the control circuit 231 and the register 22.
7A and the register 227B. Prior to outputting the first pulse signal P1, the pulse generation circuit 226 stores the second pulse signal P2 corresponding to the sampling timing synchronized with the first pulse signal P1 in the register 2.
27A and the register 227B. Thereby, the register 227A captures and holds the voltage detection data output by the battery voltage detection circuit 224 immediately before discharging based on the second pulse signal P2. Subsequently, the pulse generation circuit 226 outputs, for example, 1 [msec] every 24 hours.
A first pulse signal P1 having a pulse width of
5 is output. The discharge circuit 225 outputs the first pulse signal via a discharge resistor (not shown) for 1 [msec].
During the period [c], the secondary battery 220 is discharged.

As a result, the secondary battery 220 is
A voltage drop will occur in proportion to the internal resistance of 20. While the voltage drop is occurring, the register 227B captures and holds the voltage detection data output by the battery voltage detection circuit 224 during discharging based on the second pulse signal P2. The voltage drop amount calculation circuit 228
The value of the voltage detection data corresponding to the voltage of the secondary battery 220 immediately before discharging held in the register 227A and the discharging secondary battery 220 held in the register 227B
, And generates voltage drop amount data corresponding to the voltage drop amount, which is the difference between the values of the voltage detection data corresponding to the voltages V.sub.1 and V.sub.2, and outputs the data to the internal resistance calculation circuit 229. Thereby, the internal resistance calculation circuit 2
29 performs an internal resistance calculation process of the secondary battery 220.

More specifically, the resistance value of a discharge resistor (not shown) is denoted by r, the voltage of the secondary battery 220 immediately before discharge held in the register 227A is denoted by V1, and the resistor 22
Assuming that the voltage of the secondary battery 220 during discharge held at 7B is V2, the internal resistance R of the secondary battery 220 is represented by the following equation. R = r (V1−V2) / V2 The obtained internal resistance R is output to the conversion table 230 as internal resistance data. The conversion table 230 outputs various reference voltage data including charging reference voltage data for determining whether charging is necessary based on the value of the internal resistance R. That is, in the case of the above-described example, the charge warning voltage, the first operation control voltage, the second operation control voltage, and the first level remaining amount display voltage to the fifth level remaining amount display voltage as the charge reference voltage data are used as the reference voltage data. Control circuit 23
Output to 1. As a result, the control circuit 231 performs various operation controls and various display controls based on various reference voltage data including charge reference voltage data and voltage detection data.

More specifically, as described above, when the value of the internal resistance is 20 (Ω), when the voltage of the secondary battery 220 becomes 2.7 [V] or less, the user is prompted to charge. A charge warning, for example, a message such as “Please charge the battery.” Is displayed on the display unit 232. Also, the secondary battery 2
When the voltage at 20 becomes 2.6 [V] or less, for example, the alarm driving (sounding) time is set to a half of the normal time.
Further, when the voltage of the secondary battery 220 becomes 2.4 [V] or less, for example, control is performed so as to reduce the drive duty of the EL display as the display unit 232 by 30%. When the voltage of the secondary battery 220 is equal to or higher than 4.0 [V], all of the first to fifth voltage marks are in a lighting state, and the voltage is lower than 4.0 [V] and equal to or higher than 3.7 [V]. In this case, the first to fourth voltage marks are turned on, and the fifth voltage mark is turned off. Similarly, the voltage of the secondary battery 220 is 2.7 [V].
If it becomes less than, all of the first to fifth voltage marks are turned off,
At the same time, a charge warning is issued to prompt the user to charge.

[4.2] Charging Operation Next, the charging operation will be described. When a charging warning is given to the display unit 232 of the electronic timepiece 200, the electronic timepiece 200 is fitted into the station as shown in FIG. Thereby, the clock side coil 210 of the electronic timepiece 200
Are electromagnetically coupled to the station side coil 110 and receive electric energy from the station 100 side. The charging current based on the received electric energy flows in a certain direction by the backflow prevention diode 223, and is stored in the secondary battery 220.

[5] Effects of the Embodiment As described above, according to the embodiment, the charging timing can be accurately determined with a simple configuration without being affected by the variation of the battery and the increase in the internal resistance due to the deterioration. Can be determined. As a result, the user can be notified of the correct charging timing. In addition, the discharge was performed for 24 hours, that is, for 1 hour.
Since it may be performed about once a day, compared to the second conventional example,
The power consumption accompanying the measurement of the voltage drop amount can be greatly reduced. Further, the operation of the electronic timepiece is controlled according to the detected battery voltage, so that the power consumption can be further reduced and the driving time can be extended.

[6] Modified Example [6.1] First Modified Example In the above description, the temperature change around the electronic timepiece 200 was not considered, but as shown in FIG. The internal resistance of 220 has a temperature characteristic. Therefore, the temperature around the secondary battery 220 (roughly,
A temperature sensor for measuring the temperature around the electronic timepiece 200) is provided, and the calculated internal resistance value is corrected to the internal resistance value at the reference temperature according to the detected temperature, and a charge alarm or the like is performed based on the corrected internal resistance value. By controlling the operation,
Accurate charging timing determination and operation control can be performed in a wider temperature range.

[6.2] Second Modification In the above description, the control is performed based on the internal resistance value. However, a table corresponding to the voltage drop amount at the time of discharge is provided instead of the internal resistance value. It is also possible to configure so as to perform similar control based on the voltage drop amount.

[6.3] Third Modification In the above embodiment, the electronic timepiece 20 is used as an electronic device.
However, the present invention is not limited to this. For example, an electric toothbrush, an electric shaving, a cordless phone, a mobile phone, a personal handy phone, a mobile personal computer, a P
DA (Personal Digital Assistants)
The present invention can be applied to an electronic device including a secondary battery such as the above.

[0037]

According to the present invention, the power storage device is caused to perform pulse discharge via the load resistor at predetermined time intervals, and the voltage of the power storage device before and during the pulse discharge is detected. Based on the detected voltage, the internal resistance value of the power storage device is calculated, and the charging time voltage, which is the storage voltage of the power storage device corresponding to the time when charging should be performed, is determined. In this case, it is possible to reliably charge the battery, and it is possible to accurately determine the charging time with a simple configuration without being affected by variations in batteries and an increase in internal resistance due to deterioration. . As a result, the user can be notified of the correct charging timing. In addition, since the deterioration of the internal resistance during storage proceeds slowly, it is not necessary to perform frequent discharge, and the power consumption accompanying the measurement of the amount of voltage drop can be greatly reduced. Further, the operation of the electronic device is controlled in accordance with the detected battery voltage, so that the power consumption can be further reduced and the driving time can be extended.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of a station and an electronic timepiece according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration of a station and the electronic timepiece.

FIG. 3 is a schematic block diagram of an electronic timepiece.

FIG. 4 is a diagram illustrating deterioration of internal resistance during storage of a secondary battery.

FIG. 5 is a diagram illustrating an example of a conversion table.

FIG. 6 is a diagram illustrating temperature characteristics of internal resistance.

FIG. 7 is a diagram for explaining the relationship between discharge intensity and internal resistance.

FIG. 8 is a diagram for explaining a problem of a conventional example.

[Explanation of symbols]

 100 station, 104 display unit, 110 station side coil, 130 processing circuit, 153 transistor, 154 receiving circuit, 200 electronic clock, 210 clock coil, 220 … Secondary battery 223… backflow prevention diode 224… battery voltage detection circuit 225… discharge circuit 226… pulse generation circuit 227A 227B… register 228… voltage drop amount calculation circuit 229… ... Internal resistance calculation circuit 230 ... Conversion table 231 ... Control circuit 232 ... Display unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02J 7/00 302 H02J 7/00 302D

Claims (19)

[Claims] 1. A charging timing determining device for determining a charging timing of a power storage device that can be repeatedly charged, wherein discharge control for causing the power storage device to perform pulse discharge via a load resistor at predetermined time intervals. Means, voltage detection means for detecting a voltage of the power storage device before and during pulse discharge, and internal resistance calculation means for calculating an internal resistance value of the power storage device based on the detected voltage of the power storage device. Charge timing voltage determination means for determining a charge timing voltage that is a storage voltage of the power storage device corresponding to a timing at which the charging should be performed based on the calculated internal resistance value. apparatus. 2. The charging timing determining device according to claim 1, wherein a voltage monitoring means for monitoring a storage voltage of the power storage device, and the storage voltage of the power storage device is charged based on a monitoring result of the voltage monitoring means. A charging notification means for providing notification for prompting charging when the timing voltage is exceeded, and a charging timing discriminating device comprising: 3. The charging timing determining device according to claim 1, wherein a temperature detecting means for detecting a temperature around the power storage device, and a resistance value for correcting the internal resistance value based on the detected temperature. A charging timing determination device comprising: a correction unit. 4. A charge timing determination device for determining a charge timing of a power storage device capable of repeatedly charging, wherein discharge control for causing the power storage device to perform pulse discharge via a load resistor at predetermined time intervals. Means, voltage detecting means for detecting a voltage of the power storage device before and during pulse discharge, and calculating a voltage drop amount of the power storage device during the pulse discharge based on the detected voltage of the power storage device. Voltage drop amount calculating means, and charging time voltage drop amount determining means for determining a charging time voltage drop amount which is a voltage drop amount of the power storage device corresponding to a time when the charging should be performed based on the calculated voltage drop amount, A charging timing determining device comprising: 5. The charging timing determination device according to claim 4, wherein a voltage monitoring means for monitoring a storage voltage of the power storage device, and a voltage at the time of pulse discharge of the power storage device based on a monitoring result of the voltage monitoring means. A charge notifying unit for notifying a user to urge charging when the drop amount exceeds the charge timing voltage drop amount. 6. The charging timing judging device according to claim 4, wherein a temperature detecting means for detecting a temperature around the power storage device; and a voltage drop amount at the time of the pulse discharging based on the detected temperature. And a descent amount correcting means for correcting the charging timing. 7. An electronic device, comprising: a power storage device capable of repeatedly charging; and a charging timing determination device according to claim 1. 8. The electronic device according to claim 7, wherein the operation of the electronic device is performed based on one of an internal resistance value of the power storage device and a voltage drop amount of the power storage device and an actual storage voltage of the power storage device. An electronic device comprising an operation state control means for controlling a state. 9. The electronic device according to claim 8, wherein the operation state control means stores in advance a relationship between an internal resistance value of the power storage device or a voltage drop amount of the power storage device and a control state of the operation state. An electronic device comprising an operation state control storage unit. 10. The electronic device according to claim 8, wherein the operation state control means prohibits driving of one or a plurality of loads predetermined according to an actual storage voltage of the power storage device. An electronic device comprising a load driving prohibition unit. 11. A charging timing determining method for determining a charging timing of a power storage device capable of repeatedly charging, comprising: a discharging step of causing the power storage device to perform pulse discharge via a load resistor at predetermined time intervals. A voltage detection step of detecting a voltage of the power storage device before and during pulse discharge; an internal resistance calculation step of calculating an internal resistance value of the power storage device based on the detected voltage of the power storage device; A charging timing voltage determining step of determining a charging timing voltage that is a storage voltage of the power storage device corresponding to a timing at which the charging should be performed based on the calculated internal resistance value. . 12. The charging timing determination method according to claim 11, wherein a voltage monitoring step of monitoring a storage voltage of the power storage device, and the storage voltage of the power storage device being charged based on a monitoring result in the voltage monitoring step. A charge notification step of providing a notification for prompting charging when the timing voltage is exceeded, and a charge timing determination method. 13. The charging timing determining method according to claim 11, wherein a temperature detecting step for detecting a temperature around the power storage device, and a resistance value for correcting the internal resistance value based on the detected temperature. A charging timing determining method, comprising: a correcting step; 14. A charge timing determination method for determining a charge timing of a power storage device capable of repeatedly charging, comprising: discharging control for causing the power storage device to perform pulse discharge via a load resistor at predetermined time intervals. A voltage detection step of detecting a voltage of the power storage device before and during pulse discharge; and calculating a voltage drop amount of the power storage device during the pulse discharge based on the detected voltage of the power storage device. A voltage drop amount calculating step, and a charge time voltage drop amount determining step of determining a charge time voltage drop amount that is a voltage drop amount of the power storage device corresponding to a time when the charging should be performed based on the calculated voltage drop amount, A charging timing determination method comprising: 15. The charging timing determining method according to claim 14, wherein a voltage monitoring step of monitoring a storage voltage of the power storage device; and a voltage at the time of pulse discharge of the power storage device based on a monitoring result in the voltage monitoring step. A charge notification step of providing a notification for prompting charging when the drop amount exceeds the charge timing voltage drop amount. 16. The charging timing determining method according to claim 14, wherein a temperature detecting step of detecting a temperature around the power storage device; and a voltage drop amount during the pulse discharge based on the detected temperature. And a descent amount correcting step of correcting the charging timing. 17. A control method for an electronic device, comprising: a power storage device capable of repeatedly charging; and a charging timing determination device according to claim 1, wherein an internal resistance value of the power storage device is provided. Alternatively, there is provided an operation state control step of controlling an operation state of the electronic device based on one of a voltage drop amount of the power storage device and an actual storage voltage of the power storage device. . 18. The method for controlling an electronic device according to claim 17, wherein the operation state control step includes the step of controlling the operation state and the internal resistance value of the power storage device or the voltage drop amount of the power storage device stored in advance. A method for controlling an operation state based on the relationship of 19. The method for controlling an electronic device according to claim 18, wherein the operation state control step includes driving one or a plurality of loads predetermined by the power storage device in accordance with an actual storage voltage of the power storage device. A method for controlling an electronic device, comprising a heavy load driving prohibition step of prohibiting.