JP5902203B2 - Charging device, charger, electronic device, and charging control method - Google Patents

Description

  The present invention relates to a technique for charging a secondary battery provided in an electronic device.

Electronic devices such as a wireless microphone and a mobile phone equipped with a secondary battery are generally quickly charged when installed in a charger.
FIG. 6 shows an example of a change in battery voltage with respect to the elapsed charging time when the secondary battery is rapidly charged. For example, when a nickel metal hydride battery or nickel-cadmium battery is rapidly charged, as shown in the figure, the voltage of the secondary battery rises while drawing a predetermined curve (battery voltage curve in the figure) along with the rapid charge, and is fully charged. Charge (peak value). Thereafter, the charging current changes to heat, the battery generates heat, and the voltage starts to drop. A method is known in which it is determined that the battery is fully charged by detecting the voltage drop (−ΔV) and the rapid charging is terminated.

  By the way, if the charged wireless device is used for a short time of about several minutes and then installed in the charging device again, the secondary battery will be charged quickly even though there is sufficient remaining capacity, and it will be fully charged. (Peak value) is reached.

When such a full charge (peak value) state is repeated, there is a problem that the life of the secondary battery is shortened.
Various charge control methods have been proposed to deal with the above problems. For example, a charge control method is known in which the time from the completion of the previous rapid charge is measured by a timer after completion of the rapid charge, and the trickle charge mode is set even if the wireless device is repeatedly attached and detached for a predetermined time (for example, patents) Reference 1 and Patent Document 2). Alternatively, the temperature of the secondary battery is detected, the elapsed time after the quick charging of the secondary battery is measured, and the temperature detected when the secondary battery is installed in the charging device is equal to or higher than a predetermined value and has elapsed. A charge control method for prohibiting rapid charging when the time is less than a predetermined value is known (see, for example, Patent Document 3).

Japanese Patent No. 3707826 Japanese Patent No. 2687564 Japanese Patent Laid-Open No. 7-312231

  However, these conventional charge control methods measure the time from the previous quick charge completion with a timer and prohibit the quick charge for a predetermined time. For example, after charging the wireless device quickly, use it for several minutes. If it is installed in the charger again, even if there is a sufficient remaining capacity, rapid charging will be performed again after a predetermined time.

  In addition, if the wireless device is used frequently in a short period of time and is repeatedly installed and removed, it is assumed that quick charging will not be performed because it is within the predetermined time even though the remaining capacity is insufficient. The problem that the battery runs out during use may also occur.

  Therefore, an object of the present invention is to perform quick charging as needed while suppressing the frequency of full charge of the secondary battery.

  According to one aspect of the present invention, a charging device that charges a secondary battery included in an electronic device includes: a detection unit that detects that the electronic device is electrically connected; and a detection by the detection unit. Based on the voltage detected by the voltage detecting means when the predetermined time measured by the time measuring means, the time detecting means for measuring the predetermined time for performing trickle charging, the voltage detecting means for detecting the voltage of the secondary battery has elapsed. And control means for determining whether or not rapid charging is possible.

  In the present invention, rapid charging can be performed as necessary while suppressing the frequency of full charge of the secondary battery.

Schematic configuration diagram of a charger according to Embodiment 1 First half flowchart showing operation by charging device Second half flowchart showing the operation of the charging device Diagram showing usage example of charger The flowchart which shows the operation | movement by the charging device by other embodiment. Graph showing changes in charging voltage due to rapid charging

<1. Embodiment 1>
<1.1 Charger 1>
FIG. 1 schematically shows a configuration of a charger 1 according to an embodiment of the present invention. The charger 1 includes a power supply circuit 30 to which power from a commercial AC power supply is input and a charging device 10 that controls the amount of current from the power supply circuit 30 to the charging terminal 23. The power supply circuit 30 supplies power to the charging terminal 23 through charging control by the charging device 10. The charging terminal 23 is connected to a secondary battery 25 to be charged. The charging terminal 23 also inputs a voltage value to the charging device 10 via the voltage dividing circuit 24. The charging device 10 controls the amount of current from the power supply circuit 30 according to the input voltage value, and charges the secondary battery 25 connected to the charging terminal 23.

  The secondary battery 25 is a storage battery suitable for rapid charging, such as a nickel-hydrogen secondary battery or a nickel-cadmium battery. The secondary battery 25 is built in a wireless device such as a wireless microphone or a mobile phone, or is detachably installed. When the wireless device is installed in the charger, the charging terminal 23 and the secondary battery 25 are connected, and charging is possible.

<1.2 Configuration of Charging Device 10>
As shown in FIG. 1, the charging device 10 according to the present embodiment includes a voltage detection unit 12 (an example of a detection unit or a voltage detection unit), a timer 13 (an example of a time measurement unit), and a charge control unit 14 (an example of a control unit). ), Trickle charging unit 15, quick charging unit 16, and charging switching unit 17.
The voltage detector 12 detects a digitized voltage through A / D conversion or the like based on the voltage input from the voltage dividing circuit 24. The timer 13 measures the time for trickle charging and rapid charging described later. The charging control unit 14 controls charging to the charging terminal 23 according to the voltage detected by the voltage detecting unit 12 and the time measured by the timer 13. The functions of the voltage detection unit 12, the timer 13, and the charge control unit 14 are realized by the processor P reading and executing a program stored in the memory M (an example of a storage unit). The processor can be realized by a digital circuit such as a DSP, FPGA, or ASIC (Application Specific Integrated Circuit).

  The trickle charging unit 15 performs trickle charging on the secondary battery 25 via the charging terminal 23. The quick charging unit 16 performs quick charging for the secondary battery 25 via the charging terminal 23. The charging switching unit 17 switches between the trickle charging unit 15 and the quick charging unit 16 in accordance with a command from the charging control unit 14. The charge switching unit 17 is connected to the trickle charging unit 15 in an initial state after the microphone is attached.

The trickle charging unit 15, the quick charging unit 16, and the charging switching unit 17 function as a charging adjustment unit 19. The trickle charging unit 15, the quick charging unit 16, and the charge switching unit 17 may each be configured by a circuit, but are not limited thereto. If the charge adjustment unit 19 has a configuration for executing a function of switching between trickle charge and quick charge by changing the amount of current to the charge terminal 23 in accordance with a command from the charge control unit 14, what kind of circuit configuration is used? There may be.
The quick charge indicates an operation in which a large current is supplied to the secondary battery 25 to charge in a short time, and for example, charging is performed at approximately 1/2 It or more with respect to the rated discharge current value It. The trickle charge is a charge that continuously gives a weak current, for example, charging at about 1/30 It to 1/20 It.

<1.3 Operation of Charging Device 10>
2 and 3 are flowcharts showing control by the charging apparatus 10 according to the present embodiment. In this flowchart, a wireless microphone will be described as an example of the wireless device.

  Step S101: The voltage detection unit 12 determines whether or not the wireless microphone is attached to the charger 1 by detecting a predetermined voltage. Specifically, when the wireless microphone is attached to the charger 1, the secondary battery 25 of the wireless microphone and the charging terminal 23 of the charger 1 are connected. As a result, a predetermined voltage is applied to the charging terminal 23 and is detected by the voltage detector 12 via the voltage dividing circuit 24. Thus, when a predetermined voltage is detected, it progresses to step S102.

  If the voltage detected in this step is abnormal, that is, if the voltage is different from a predetermined voltage preset as a voltage when the microphone is attached, the process may be terminated as an error. This is because the connected secondary battery may not be the type to be charged.

  Step S102: When the voltage detection unit 12 detects that the microphone is attached in step S101, the voltage detection unit 12 determines whether or not the detected voltage is less than a third voltage value (for example, 1.5 V) described later. If it is less than the third voltage value, the process proceeds to step S103, and if it is greater than or equal to the third voltage value, the process proceeds to step S112.

  In the prior art, trickle charging is performed when the initial voltage of the secondary battery when installed in the charger is less than 1.1V, for example, and rapid charging is performed when the initial voltage is 1.1V or more. This is because a battery having an initial voltage of less than 1.1 V is in a state in which the substance inside the battery is inactive, and if such an inactive secondary battery is rapidly charged, the secondary battery is damaged and the battery is damaged. This is because there is a risk of shortening the lifetime. However, in this embodiment, quick charge is not performed regardless of whether the initial voltage of the secondary battery is 1.1 V or higher, and trickle charge is performed in the next step S103.

  Step S103: The charging control unit 14 instructs the charging switching unit 17 to select the trickle charging unit 15. Thus, trickle charging is performed on the charging terminal 23. The charge switching unit 17 is connected to the trickle charging unit 15 in an initial state after the microphone is attached.

  The trickle charging at this time is preliminary trickle charging (hereinafter referred to as preliminary trickle charging). For example, the trickle charging is performed for about 5 minutes, and the timer 13 measures the time. This preliminary trickle charging time is set so that quick charging is not performed immediately in consideration of the activation of the battery and the frequency of installation / removal of the wireless device by the user. Thus, it may be shorter or longer than about 5 minutes. In many cases, it is desirable to have a pre-trickle charge time of 3 minutes or more.

By taking this preliminary trickle charging time, it is possible to reduce the load due to rapid charging and extend the battery life even for secondary batteries in any state as compared with the conventional charging control method. Specifically, there are the following effects.
(1) When a fully discharged battery (that is, a battery having a voltage lower than the end voltage) is inserted, the internal substance of the battery can be activated by this preliminary trickle charge time.
(2) In the case of a deteriorated battery, the internal trickle can be lowered and stabilized by this preliminary trickle charge time.
(3) It is possible to prevent a battery load due to rapid charging caused by the temperature of the battery. For example, in the case of a battery having a high temperature immediately after rapid charging (for example, about 60 ° C. or more), rough heat can be obtained by this preliminary trickle charging. It should be noted that the battery temperature does not increase so that the preliminary trickle charging makes the battery unsuitable for rapid charging.
(4) When a battery is repeatedly inserted and removed in a short time in a fully charged state, unnecessary rapid charging can be avoided.

  In the case of a fully discharged battery, it takes about 2 hours to fully charge, but applying a trickle charge of about 5 minutes to this does not inconvenience the user from the viewpoint of protecting the battery life. .

  Step S104: During the preliminary trickle charge started in step S103, the voltage detection unit 12 detects whether or not the wireless microphone has been removed. Specifically, when the wireless microphone is removed from the charger 1, the secondary battery 25 of the wireless microphone and the charging terminal 23 of the charger 1 are disconnected, and the voltage applied to the charging terminal 23 becomes, for example, approximately zero. . This voltage drop is detected by the voltage detector 12 via the voltage dividing circuit 24. If this voltage drop is not detected, the process proceeds to step S105. If a voltage drop is detected, the process ends.

  Step S105: When the timer 13 detects that about 5 minutes have elapsed from the start of the preliminary trickle charge, the charge control unit 14 detects the voltage of the charging terminal 23 via the voltage detection unit 12. The charge controller 14 determines the voltage from the voltage detector 12. If the detected voltage is less than the first voltage value (for example, 1.0 V), there is a possibility that the secondary battery is in an abnormal state such as a short circuit, or a secondary battery that is not a charging target is mounted. Therefore, the process proceeds to step S106 and error processing is performed. If the detected voltage is less than the first voltage value and less than the third voltage value (eg, 1.5 V) that is less than full charge, the process proceeds to step S107. If the detected voltage is equal to or higher than the third voltage value, the process proceeds to step S112 (FIG. 3). If the detected voltage is too high (for example, 1.6 V or more), there is a possibility that a secondary battery that is not the type to be charged is connected, so the process proceeds to step S106 and error processing is performed. May be.

  Step S106: If the detected voltage is less than the first voltage value in step S105, an error is displayed and charging is stopped. In addition, you may make it display an error display by lighting of the LED lamp provided in the charger 1, the alarm by a predetermined audio | voice output means, or the display means by LCD.

  Step S107: When the voltage detected in Step S105 is equal to or higher than the first voltage value and lower than the third voltage value, the detected voltage is further equal to or higher than a second voltage value (eg, 1.4 V) that is lower than the third voltage value. It is determined whether or not. If the detected voltage is greater than or equal to the second voltage value, the process proceeds to step S108 (FIG. 3). If the detected voltage is less than the second voltage value, the process proceeds to step S111 (FIG. 3).

  Step S108: When the voltage detected in Step S107 is equal to or higher than the second voltage value, the charging control unit 14 selects the trickle charging unit 15 while leaving the charging switching unit 17 as it is, and continues to trickle charge the charging terminal 23. I do. The trickle charge at this time is performed for about 55 minutes, for example, and the timer 13 measures the time.

  In other words, the detected voltage is equal to or higher than the second voltage value. In other words, the secondary battery 25 is not in a fully charged state but is in a state that does not require quick charging. By continuously performing trickle charging on such a secondary battery 25, the load on the battery due to frequent full charge can be more reliably reduced.

  Step S109: During trickle charging in step S108, the voltage detection unit 12 detects whether the wireless microphone has been removed. Specifically, when the wireless microphone is removed from the charger 1, the secondary battery 25 of the wireless microphone and the charging terminal 23 of the charger 1 are disconnected, and the voltage applied to the charging terminal 23 becomes, for example, approximately zero. . This voltage drop is detected by the voltage detector 12 via the voltage dividing circuit 24. If no voltage drop is detected, the process proceeds to step S110. If a voltage drop is detected, the process ends.

  Step S110: When the timer 13 detects the passage of about 55 minutes from the start of trickle charging, the charging control unit 14 detects the voltage of the charging terminal 23 via the voltage detection unit 12. The charge controller 14 determines the voltage from the voltage detector 12. If the detected voltage is less than a third voltage value (for example, 1.5 V), the process proceeds to step S111. If the detected voltage is greater than or equal to the third voltage value, the process proceeds to step S112.

Step S <b> 111: The charging control unit 14 instructs the charging switching unit 17 to select the quick charging unit 16 and performs quick charging on the charging terminal 23.
Note that the voltage detection unit 12 may detect whether or not the wireless microphone has been removed during the quick charging, similarly to step S109. In this case, when removal of the microphone is detected, the trickle charging unit 15 is switched to, and the process ends.

Step S112: The charge control unit 14 determines the full charge of the secondary battery 25 by -ΔV detection or the like, thereby instructing the charge switching unit 17 to select the trickle charge unit 15, thereby terminating the quick charge. Set to the state of supplementary charging. The completion of the quick charge may be displayed by turning on an LED lamp provided in the charger 1, an alarm by a predetermined sound output means, or a display means by LCD.
In the above process, when the process is completed while the timer 13 is measuring, the count of the timer 13 is reset.
In the above processing, the procedure, timing, etc. are not limited to those described above. For example, in the processing from the above steps S101 to S110, a trickle charge for a predetermined time is executed after detecting the attachment of the wireless device, and after the predetermined time has elapsed, whether or not to perform a quick charge by detecting a voltage is determined. It may be determined.

<1.4 Usage example of charger 1>
4 (a), 4 (b), and 4 (c) show usage examples of the charger 1. FIG. The charger 1 is provided in a frame 2 in which a wireless device such as a wireless microphone is installed. The frame 2 has the insertion ports 3 for a plurality of wireless devices. A plurality of chargers 1 are provided according to the number of the insertion ports 3. The shapes of the frame body 2 and the insertion port 3 are adapted to the shape of the wireless device.
The wireless device is set so that the secondary battery 25 of the wireless device and the charging terminal 23 of the charger 1 are connected to each other through the insertion port 3.

<1.5 Features of Embodiment 1>
In the first embodiment, the charging control unit 14 of the charging apparatus 10 determines whether to perform quick charging according to the voltage detected by the voltage detection unit 12 after performing preliminary trickle charging for a predetermined time. For this reason, it is possible to prevent the wireless device from being rapidly charged more than necessary, thereby reducing the load on the secondary battery 25 and preventing overcharging. Thereby, the cycle life of the secondary battery 25 used for the wireless device can be extended.

  In particular, a wireless device having a usage pattern in which the installation and removal of the charging device 10 are frequently performed in a short time, such as a wireless microphone, has a great adverse effect due to repeated rapid charging. That is, at the peak voltage due to rapid charging, the capacity of the battery exceeds 100%, and when the above-described drop voltage (−ΔV) is detected, the charging current becomes thermal energy instead of electric energy. Frequently placing the battery in such a state increases the load on the battery and shortens its life. In the charging device 10 according to the above-described embodiment, the frequency of rapid charging with respect to the secondary battery 25 can be suppressed. Therefore, the lifetime of the secondary battery 25 can be extended while maintaining convenience as a wireless device.

  In the first embodiment, the charging control unit 14 also has a higher voltage than the first voltage value when the voltage detected by the voltage detection unit 12 is equal to or higher than the first voltage value higher than 0V and lower than the third voltage value. It is determined whether or not the voltage is equal to or greater than two voltage values. When the voltage is equal to or greater than the second voltage value, trickle charging is further performed for a predetermined time. For this reason, the frequency of the full charge of the secondary battery by quick charge can further be suppressed.

In the first embodiment, the trickle charging time and the quick charging time are measured by the timer 13 provided in the charging device 10. However, when the charging terminal 23 of the wireless device is in a disconnected state, the process is terminated and measured. Reset the time. Since this embodiment can be implemented by designing only the charging device side, it is not necessary to provide a timer on the wireless device side, and it is not necessary to measure and store the time after the quick charging, and the design on the wireless device side is not necessary. . Therefore, since one charger 1 can be shared by a plurality of wireless devices, memory resources can be saved and the design is facilitated.
In the first embodiment, it is not necessary to obtain battery temperature information in order to determine whether quick charging is possible. Therefore, it is not necessary to provide battery temperature detection means such as a thermistor.

<2 Other Embodiments>
The specific configuration of the present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the scope of the invention. For example, in the following embodiment, the same effect as or more than that in the first embodiment can be obtained.
<2.1>
In the charging device 10 according to the first embodiment, if the voltage detected in step S105 in FIG. 2 is not less than the first voltage value (for example, 1.0 V) and less than the third voltage value (for example, not less than 1.5 V). Furthermore, although it is determined whether or not the voltage detected in step S107 is equal to or higher than a second voltage value (for example, 1.4 V), the present invention is not limited to this. For example, if the voltage detected in step S105 is not less than the first voltage value and less than the third voltage value, the trickle charge in step S108 of FIG. 3 may be performed without performing the determination in step S107. In this case, the trickle charging time in step S108 may be shorter than the time (for example, 55 minutes) in the first embodiment.

<2.2>
Steps S108 to S110 in FIG. 3 in the first embodiment may be repeated a predetermined number of times. In other words, the charging control unit 14 counts the number of times that a negative determination has been made as to whether or not quick charging is possible, and performs a quick charging if a negative determination is made more than a predetermined number of times. For example:
FIG. 5 shows a process replacing step S108 to step S110 in FIG.
Step S208: When the voltage detected in Step S107 is equal to or higher than the second voltage value, the charging control unit 14 selects the trickle charging unit 15 while leaving the charging switching unit 17 as it is, and continues to trickle charge the charging terminal 23. I do. The trickle charge at this time is performed for about 20 minutes, for example, and the timer 13 measures the time.

  Step S209: During trickle charging in step S208, the voltage detection unit 12 detects whether the wireless microphone has been removed. Specifically, when the wireless microphone is removed from the charger 1, the secondary battery 25 of the wireless microphone and the charging terminal 23 of the charger 1 are disconnected, and the voltage applied to the charging terminal 23 becomes, for example, approximately zero. . This voltage drop is detected by the voltage detector 12 via the voltage dividing circuit 24. If this voltage drop is not detected, the process proceeds to step S210. If a voltage drop is detected, the process ends.

  Step S210: When the timer 13 detects that about 20 minutes have elapsed from the start of trickle charging, the charging control unit 14 detects the voltage of the charging terminal 23 via the voltage detection unit 12. The charge controller 14 determines the voltage from the voltage detector 12. If the detected voltage is less than a third voltage value (for example, 1.5 V), the process proceeds to step S211. If the detected voltage is greater than or equal to the third voltage value, the process proceeds to step S112 (FIG. 3).

Step S211: The charging control unit 14 determines whether or not the processing from Step S208 to Step S210 has been repeated a predetermined number of times (for example, three times). If the predetermined number of times has not been repeated, the process returns to step S208, and if the predetermined number of times has been repeated, the process proceeds to step S111 (FIG. 3) to perform quick charging.
The trickle charge time may be fixed or may be shortened each time the process is repeated.

<2.3>
In the first embodiment, the wireless microphone is attached in step S101 in FIG. 2, and after preliminary trickle charging for a predetermined time in step S103, voltage detection is performed in step S105. However, the present invention is not limited to this. Not. For example, voltage detection is performed at predetermined intervals during the preliminary trickle charge time in step S103, and when the voltage exceeds the third voltage value, the process proceeds to step S112, and when the voltage exceeds the first voltage value, the process proceeds to step S107. Good.
<2.4>
In the first embodiment, when the voltage is detected in step S105, the error is displayed when the voltage is less than the first voltage value. However, the present invention is not limited to this. For example, when the detected voltage is less than 1.1 V, trickle charging may be continued for about 15 minutes, and then the determination process in step S105 may be performed again.
In this manner, by performing trickle charging, a battery that has not been sufficiently activated by preliminary trickle charging can be activated.

<2.5>
In the said Embodiment 1, although the processor P of the charging device 10 is provided with respect to each charger 1, this invention is not limited to this. For example, it is also possible to control a plurality of chargers 1 with a single processor P.
<2.6>
In the first embodiment, the voltage values of the first voltage value, the second voltage value, and the third voltage value in step S105 and step S107 in FIG. 2 are not limited to the voltage values listed in the first embodiment. Each voltage value may be set in advance according to a device or a battery to be charged.
Further, the trickle charging time is not limited to the above embodiment, and may be set in advance according to a device or a battery to be charged.

<2.7>
In the first embodiment, a wireless microphone is used as an example of a wireless device, but other transmitters and receivers (including earphones) may be used. Further, it may be a mobile device such as a mobile phone.
<2.8>
In the first embodiment, a nickel hydride secondary battery or a nickel cadmium battery is used as an example of the secondary battery 25, but a lithium secondary battery or a lithium ion battery may be used.
<2.9>
In the first embodiment, the voltage is transmitted from the charging terminal 23 to the charging device 10 via the voltage dividing circuit 24. However, the voltage dividing circuit may not be provided depending on the value of the battery voltage to be charged.
<2.10>
In the first embodiment, when the secondary battery 25 and the charging terminal 23 are in a disconnected state (or in a state where power cannot be transmitted), the voltage applied to the charging terminal 23 is substantially zero. Is not limited to this. Depending on the circuit configuration of the charging device 10, the voltage may increase. By detecting this voltage increase, the secondary battery 25 and the charging terminal 23 are not connected (or cannot transmit power). You may do it.

<2.11>
The charging device 10 may be a device that does not include the charging adjustment unit 19 but includes the charging control unit 14 and elements for executing the functions thereof. In this case, the charging device may be provided on the wireless device side. For example, among the components in FIG. 1, components other than the power supply circuit 30 may be provided in the wireless device. In this case, the charging device is not limited to being provided in the wireless device, and may be provided in another electronic device.
<2.12>
In the first embodiment, the secondary battery 25 is charged by coming into contact with the charging terminal 23, but it is also possible to transmit electric power without using a metal contact or a connector. For example, when the charging device 10 is provided on the wireless device side, charging may be performed by contactless or non-contact power transmission by electromagnetic induction, radio waves, electromagnetic resonance, or the like via a charging end portion that performs charging. .
As described above, the secondary battery and the charging end may be electrically connected regardless of contact or non-contact.
<2.13>
Although the said Embodiment 1 has demonstrated the charging device 10 and charger 1 for wireless devices, this invention is implement | achieved also as an electronic device (it is not limited to a wireless device) including the charge control part 14, and a charge control method. it can.
Further, the charging device 10 and the charger 1 are not limited to wireless devices, but may be other electronic devices.

<2.14>
In the first embodiment, the voltage detection unit 12 determines whether the wireless device is attached to the charger 1 by detecting a predetermined voltage, but the present invention is not limited to this. For example, the charging device 10 may be provided with a battery temperature detection terminal, and the terminal may be connected to a temperature thermistor provided in the wireless device to acquire voltage information to determine whether the wireless device is attached. Alternatively, a switch may be provided in the insertion port 3 of the frame 2 of the charger 1, and when the wireless device is installed in the insertion port 3, the mounting of the wireless device may be determined by operating the switch. .
<2.15>
In the first embodiment, trickle charging for a predetermined time is executed before determining whether or not rapid charging is possible. However, the embodiment is not limited to trickle charging. There may be a state in which rapid charging is not performed for a predetermined time before determining whether rapid charging is possible.

  The charger is useful as a charger for charging a wireless device.

DESCRIPTION OF SYMBOLS 1 Charger 2 Frame 3 Socket 10 Charging device 12 Voltage detection part 13 Timer 14 Charge control part 15 Trickle charge part 16 Quick charge part 17 Charge switching part 19 Charge adjustment part 23 Charge terminal 24 Voltage dividing circuit 25 Secondary battery 30 Power supply circuit

Claims (7)

A charging device for charging a secondary battery provided in an electronic device,
Detecting means for detecting that the electronic device is electrically connected;
Time detection means for measuring a predetermined time for performing trickle charge including preliminary trickle charge and main trickle charge from detection by the detection means;
Voltage detecting means for detecting the voltage of the secondary battery;
Control means for determining whether or not rapid charging is possible based on the voltage detected by the voltage detecting means at the time when the predetermined time measured by the time measuring means has elapsed;
With
The preliminary trickle charge time of the preliminary trickle charge is shorter than the main trickle charge time of the main trickle charge,
The control means includes
Obtaining a first voltage value, a second voltage value, and a third voltage value (where 0 <first voltage value <second voltage value <third voltage value <full charge voltage value);
Before performing the preliminary trickle charge, it is determined whether the voltage detected by the voltage detection unit is equal to or higher than the third voltage value. If the voltage is less than the third voltage value, the preliminary trickle charge is performed, If the voltage is greater than or equal to the third voltage value, the secondary battery is not charged.
When the voltage detected by the voltage detection means is less than the first voltage value after a lapse of a predetermined time for performing the preliminary trickle charge, an error is output, and when the voltage is not less than the first voltage value and less than the second voltage value. It performs fast charging, if it is less than the second voltage value than the third voltage value is subjected to the trickle charge, when the third higher voltage value does not charge for said secondary battery,
Charging device. The control means further includes
If the voltage detected by the voltage detection means is less than the third voltage value when it is detected that the detection means is electrically connected to the electronic device, preliminary trickle charging is performed, and the third voltage In the above case, do not charge,
The charging device according to claim 1. A charging device for charging a secondary battery provided in an electronic device,
Detecting means for detecting that the electronic device is electrically connected;
Time measuring means for measuring a predetermined time for performing trickle charging from detection by the detecting means;
Voltage detecting means for detecting the voltage of the secondary battery;
Control means for determining whether or not rapid charging is possible based on the voltage detected by the voltage detecting means at the time when the predetermined time measured by the time measuring means has elapsed;
With
The control means further includes
Count the number of times the negative decision was made regarding whether or not the quick charge is possible, and if a negative decision is made more than a predetermined number of times, perform a quick charge,
Charging device. A charger for charging a secondary battery provided in an electronic device,
A frame for installing the electronic device;
Detecting means for detecting that the electronic device is installed in the frame;
Time detection means for measuring a predetermined time for performing trickle charge including preliminary trickle charge and main trickle charge from detection by the detection means;
Voltage detecting means for detecting the voltage of the secondary battery;
Control means for determining whether or not rapid charging is possible based on the voltage detected by the voltage detecting means at the time when the predetermined time measured by the time measuring means has elapsed;
With
The preliminary trickle charge time of the preliminary trickle charge is shorter than the main trickle charge time of the main trickle charge,
The control means includes
Obtaining a first voltage value, a second voltage value, and a third voltage value (where 0 <first voltage value <second voltage value <third voltage value <full charge voltage value);
Before performing the preliminary trickle charge, it is determined whether the voltage detected by the voltage detection unit is equal to or higher than the third voltage value. If the voltage is less than the third voltage value, the preliminary trickle charge is performed, If the voltage is greater than or equal to the third voltage value, the secondary battery is not charged.
When the voltage detected by the voltage detection means is less than the first voltage value after a lapse of a predetermined time for performing the preliminary trickle charge, an error is output, and when the voltage is not less than the first voltage value and less than the second voltage value. It performs fast charging, if it is less than the second voltage value than the third voltage value is subjected to the trickle charge, when the third higher voltage value does not charge for said secondary battery,
Charger. The frame has a plurality of insertion ports for installing a plurality of the electronic devices,
The control means individually controls charging of electronic devices installed in the plurality of insertion ports,
The charger according to claim 4. An electronic device having a secondary battery,
Detecting means for detecting that it is electrically connected to an external power source;
Time detection means for measuring a predetermined time for performing trickle charge including preliminary trickle charge and main trickle charge from detection by the detection means;
Voltage detecting means for detecting the voltage of the secondary battery;
Control means for determining whether or not rapid charging is possible based on the voltage detected by the voltage detecting means at the time when the predetermined time measured by the time measuring means has elapsed;
With
The preliminary trickle charge time of the preliminary trickle charge is shorter than the main trickle charge time of the main trickle charge,
The control means includes
Obtaining a first voltage value, a second voltage value, and a third voltage value (where 0 <first voltage value <second voltage value <third voltage value <full charge voltage value);
Before performing the preliminary trickle charge, it is determined whether the voltage detected by the voltage detection unit is equal to or higher than the third voltage value. If the voltage is less than the third voltage value, the preliminary trickle charge is performed, If the voltage is greater than or equal to the third voltage value, the secondary battery is not charged.
When the voltage detected by the voltage detection means is less than the first voltage value after a lapse of a predetermined time for performing the preliminary trickle charge, an error is output, and when the voltage is not less than the first voltage value and less than the second voltage value. It performs fast charging, if it is less than the second voltage value than the third voltage value is subjected to the trickle charge, when the third higher voltage value does not charge for said secondary battery,
Electronics. A charge control method for charging a secondary battery provided in an electronic device,
Detecting that the electronic device is installed;
From the detection , measuring a predetermined time for performing trickle charging including preliminary trickle charging and main trickle charging ;
Detecting the voltage of the secondary battery at the time when the measured predetermined time has elapsed;
Determining whether quick charging is possible based on the detected voltage;
Including
The preliminary trickle charge time of the preliminary trickle charge is shorter than the main trickle charge time of the main trickle charge,
Furthermore,
Obtaining a first voltage value, a second voltage value, and a third voltage value (where 0 <first voltage value <second voltage value <third voltage value <full charge voltage value);
Before performing the preliminary trickle charge, it is determined whether or not the detected voltage is equal to or greater than the third voltage value. If the detected voltage is less than the third voltage value, the preliminary trickle charge is performed, and the voltage is equal to or greater than the third voltage value. In the case of, the secondary battery is not charged,
After a predetermined time for performing the preliminary trickle charge, if the detected voltage is less than the first voltage value, an error is output, and if the detected voltage is greater than or equal to the first voltage value and less than the second voltage value, rapid charge is performed. The trickle charge is performed when the voltage is greater than or equal to the second voltage value and less than the third voltage value, and the secondary battery is not charged when the voltage value is greater than or equal to the third voltage value.
Charge control method.

Images