JP2008005634A - Charging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a charging apparatus with which apparatus load power required for operating a function of a cellular phone is supplied from a storage cell or the charging apparatus, and the storage cell can receive supply of charging power from the charging apparatus. <P>SOLUTION: The charging apparatus includes a charging circuit for receiving supply of power and supplying charging power to the storage cell; and a comparing circuit detecting apparatus load power supplied to an electric device arrangement and charging power, obtaining a sum of apparatus load power, and charging power and outputting a charging power control signal for adjusting charging power to the charging circuit based on the sum. The charging circuit supplies charging power corresponding to the charging power control signal to the storage cell. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a charging device for charging a storage battery used in a mobile phone or the like and a charging method thereof.

  FIG. 1 shows a conventional charging device 2 used for a mobile phone, and shows a state in which the charging device 2 is connected to a battery pack 8 and a device load 10. The device load 10 corresponds to, for example, a mobile phone. As shown in FIG. 1, the electrical connection relationship between the charging device 2, the battery pack 8, and the device load 10 is a series connection.

  When the battery pack such as a mobile phone is being charged, there are a case where the battery pack is simply charged and a case where a phone call is made while the battery pack is being charged.

  In recent years, not only a telephone function but also a function as a music player and the like have been added to mobile phones in recent years, and the functions have become highly functional and multifunctional. Therefore, the power consumption of mobile phones in recent years has increased compared to conventional mobile phones.

  The power for operating the function of the mobile phone (hereinafter referred to as device load power) is supplied from the battery pack 8 because the charging device 2, the battery pack 8 and the device load 10 are connected in series as described above. Therefore, the cellular phone cannot operate its function unless the battery pack 8 is present.

  The rated power of the AC adapter 4 is designed to be the maximum of the power charged in the battery pack 8 (hereinafter referred to as charging power). Therefore, when the function of the mobile phone is operated, the device load power is supplied from the battery pack 8, but when the device load power exceeds the charge power, the battery pack 8 preferentially discharges rather than charge.

Patent Document 1 discloses a charging device that simultaneously performs charging from an AC adapter to a battery and feeding to a portable information terminal main body. The charging device includes a current detection unit that detects a current value consumed by the mobile information terminal main body, and a battery charging current within a range in which the supply current of the AC adapter does not exceed the rated value based on a signal from the current detection unit. And a charging current control unit for increasing the current.
JP2003-189501

  An object of the present invention is to provide a charging device in which device load power necessary for operation of a function such as a mobile phone is supplied from a storage battery or a charging device.

  Another object of the present invention is to provide a charging device in which a storage battery can receive supply of charging power from the charging device even when a function such as a cellular phone is operated.

  Hereinafter, means for solving the problem will be described using the numbers used in (Best Mode for Carrying Out the Invention). These numbers are added to clarify the correspondence between the description of (Claims) and (Best Mode for Carrying Out the Invention). However, these numbers should not be used to interpret the technical scope of the invention described in (Claims).

  The charging device according to the present invention includes a charging circuit (12 ′) for supplying charging power (22) to the storage battery (8) in response to power supply, and a device load power (20) supplied to the electric device (10). The charging power (22) is detected, the sum of the device load power (20) and the charging power (22) is obtained, and a charging power control signal (50) for adjusting the charging power (22) based on the sum is obtained. And a comparison circuit (16) for outputting to the charging circuit (12 '), and the charging circuit (12') supplies charging power (22) corresponding to the charging power control signal (50) to the storage battery (8). .

  The charging device according to the present invention further includes an AC adapter (4) for supplying the device load power (20) to the electric device (10) and supplying the charging power (22) to the storage battery (8).

  In the charging device according to the present invention, the charging power (22) is an amount obtained by subtracting the device load power (20) from the rated power (18) of the AC adapter.

In the charging device according to the present invention, the electrical device (10) is a mobile phone.

  The method for charging a storage battery according to the present invention includes a charging circuit (12 ′) that supplies electric power and supplies charging power (22) to the storage battery (8), and the comparison circuit (16) is an electric device (10). The step of detecting the device load power (20) and the charging power (22) supplied to the power supply and the comparison circuit (16) obtains the sum of the device load power (20) and the charging power (22), and A step of outputting a charging power control signal (50) for adjusting the charging power (22) to the charging circuit (12 ′) based on the charging power control signal (50). Supplying the charged power (22) to the storage battery (8).

  In the method for charging a storage battery according to the present invention, the AC adapter (4) further supplies the device load power to (20) the electric device (10) and supplies the charging power (22) to the storage battery (8). It has.

  In the storage battery charging method according to the present invention, the charging power (22) is an amount obtained by subtracting the device load power (20) from the rated power (18) of the AC adapter.

  ADVANTAGE OF THE INVENTION According to this invention, the charging device with which apparatus load electric power required for operation | movement of functions, such as a mobile telephone, is supplied from a storage battery or a charging device is provided.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is operating functions, such as a mobile telephone, the charging device with which a storage battery can receive supply of charging power from a charging device is provided.

  The best mode for carrying out the charging apparatus according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 2 shows a state where the charging device 2 ′ and the battery pack 8 according to the present invention are connected to the device load 10. In this embodiment, the device load 10 is a mobile phone. The AC adapter 4 and the battery pack 8 are electrically connected in parallel to the device load 10.

  The AC adapter 4 is connected to the charging circuit 12 ′ or the like via the connector 6. Note that the AC adapter 4 may be connected to the charging circuit 12 ′ or the like without attaching the connector 6. Further, the AC adapter 4 may be provided outside the power receiving device 2 ′ without incorporating the AC adapter 4 in the charging device 2 ′. The AC adapter 4 is not necessarily the AC adapter 4 as long as it has a function of converting an alternating current into a direct current.

  The charging device 2 ′ includes a charging circuit 12 ′ and a comparison circuit 16 inside. The connector 6 branches to the comparison circuit 16 and the device load 10 at the contact point a30 via the first diode 14a, branches to the charging circuit 12 ′ and the device load 10 at the contact point b32, and the second diode 14b and the device at the contact point c34. It branches to the load 10 and branches to the comparison circuit 16 and the device load 10 at the contact point d36.

  The charging circuit 12 'is electrically joined to the battery pack 8, the comparison circuit 16, and the contact b32.

  The comparison circuit 16 is electrically connected to the charging circuit 12 ′, the contact a <b> 30, and the contact d <b> 36.

  The battery pack 8 is electrically joined to the charging circuit 12 'and the second diode 14b.

  The operation of the charging device 2 ′ of the present invention will be described with reference to FIGS. 2 and 3. FIG. 3 shows the distribution of the device load power 20 and the charging power 22 when the charging device 2 ′ according to the present invention is used.

  First, the operation of the charging device 2 ′ without the battery pack 8 will be described. The state without the battery pack 8 means a state in which the battery pack 8 is not electrically connected to the charging circuit 12 ′ and the second diode 14 b. Since the AC adapter 4 and the battery pack 8 are electrically connected in parallel to the device load 10, the device load power 20 can be supplied to the device load 10 within the rated power range of the AC adapter 4. is there. Therefore, the device load 10 can operate even when the battery pack 8 is not present.

  Next, the operation of the charging device 2 ′ with the battery pack 8 connected will be described.

  First, the operation of the charging device 2 'when the device load 10 is performing a steady operation will be described. In the present embodiment, the device load 10 is assumed to be a mobile phone, but when the device load 10 is performing a steady operation, the mobile phone is not being used for a call or the like. That is, the device load power 20 is consumed by the operation of a circuit driven for driving a built-in clock of a mobile phone or waiting for reception, and the device load power 20 is steady without fluctuation.

  At this time, the comparison circuit 16 detects the device load power 20 supplied by the mobile phone and the charging power 22 supplied by the battery pack 8. Note that the detection of the device load power 20 and the charging power 22 by the comparison circuit 16 is possible by detecting the consumption current, but the detailed description thereof is omitted.

  Further, the comparison circuit 16 performs an operation for obtaining the sum of the device load power 20 and the charging power 22 and determines whether or not the obtained sum exceeds the AC adapter rated power 18. If the obtained sum does not exceed the AC adapter rated power 18, the comparison circuit 16 outputs the charging power control signal 50 to the charging circuit 12 ′ so as to perform charging while maintaining the charging power 22. To do. The charging circuit 12 ′ has a circuit that changes the charging current according to the charging power control signal 50. Therefore, maintaining the charging power 22 means that the charging current sent from the charging circuit 12 ′ to the battery pack 8 is not changed.

  Next, the operation of the charging device 2 ′ when the device load power 20 required by the device load 10 is increased will be described. The time when the device load power 20 required by the device load 10 is increased is a state where the mobile phone is used for a call or the like, and not only the state where the mobile phone is making a call but also the function of the music player. It also means a state in which the mobile phone has music playback. In such a case, naturally, the device load power 20 of the mobile phone increases. At this time, the comparison circuit 16 detects the device load power 20 supplied by the mobile phone and the charging power 22 supplied by the battery pack 8.

  Further, the comparison circuit 16 performs an operation for obtaining the sum of the device load power 20 and the charging power 22 and determines whether or not the obtained sum exceeds the AC adapter rated power 18. Here, the sum of the device load power 20 when the device load power increases and the charging power 22 determined when the device load is steady 23 exceeds the AC adapter rated power 18. That is, the sum of the obtained power exceeds the AC adapter rated power 18.

  Therefore, the comparison circuit 16 performs an operation of subtracting the device load power 20 of 24 when the device load power increases from the AC adapter rated power 18. The comparison circuit 16 outputs a charging power control signal 50 to the charging circuit 12 ′ so that the power of the calculation result becomes the charging power 22. The charging circuit 12 ′ decreases the charging current sent to the battery pack 8 in response to the charging current control signal 50. Naturally, the charging power 22 when the device load power increases is reduced compared to the charging power 22 when the device load is steady.

  By the operation of the charging device 2 ′ as described above, the device load power 20 necessary for the operation of the mobile phone call and the music playback function is secured, and the charging power 22 for the battery pack 8 is also secured. When the device load increases, the charging power 22 at 24 is reduced as compared to when the device load is steady, but since some charging power 22 is secured, the battery pack 8 is not charged at all. This does not happen.

  Here, if the AC adapter 4 having a large rated power is prepared, the device load power 20 increased by the operation of the function of the mobile phone is supplied to the mobile phone, and the charging power 22 when the device load is steady is supplied to the battery pack. It is also considered that the supply to 8 can be achieved. However, in order to prepare the AC adapter 4 having such rated power, the AC adapter 4 having an excessively large shape is required, and the portability of the AC adapter 4 is deteriorated. Considering the actual usage of the mobile phone, there is no need for the AC adapter 4 to supply the device load power 20 increased by the operation of the function of the mobile phone for several hours. Further, during that time, it is not necessary for the AC adapter 4 to supply the charging power 22 when the apparatus load is steady. Therefore, the AC adapter 4 only needs to have a rated power specification that can secure the device load power 20 increased by the operation of the function of the mobile phone. That is, the AC adapter 4 having a shape large enough to have a rated power that is a total value of the device load power 20 increased by the operation of the function of the mobile phone and the charging power 22 when the device load is steady is not necessary. Since the charging device 2 ′ of the present embodiment is provided with the comparison circuit 16 in the charging device 2 ′ and controls the charging power 22, the function of the mobile phone is operated without preparing the large-sized AC adapter 4. However, the battery pack 8 can be charged.

  As described above, according to the charging device 2 ′ of the present invention, since the mobile phone can receive power supply from the AC adapter 4, the function of the mobile phone can be operated without using the battery pack 8. .

  Further, even if the device load power 20 necessary for operating the function of the mobile phone increases, the device load power 20 necessary for the operation of the function of the mobile phone is secured, and the charging power 22 for the battery pack 8 is also secured. be able to.

FIG. 1 shows a state in which a conventional charging device and a battery pack are connected to a device load. FIG. 2 shows a state in which the charging device and the battery pack according to the present invention are connected to the device load. FIG. 3 shows the distribution of the device load power and the charging power when the charging device according to the present invention is used.

Explanation of symbols

2: Charging device 2 ′: Charging device 4: AC adapter 6: Connector 8: Battery pack 10: Device load 12: Charging circuit 12 ′: Charging circuit 14a: First diode 14b: Second diode 16: Comparison circuit 18 : AC adapter rated power 20: Device load power 22: Charging power 23: When the device load is steady 24: When the device load power increases 30: Contact a
32: Contact b
34: Contact c
36: contact point d
50: Charging power control signal

Claims (7)

A charging circuit that receives power supply and supplies charging power to the storage battery;
A charging power control signal for detecting a device load power and the charging power supplied to an electrical device, obtaining a sum of the device load power and the charging power, and adjusting the charging power based on the sum And a comparison circuit that outputs to the charging circuit,
The charging device in which the charging circuit supplies the charging power corresponding to the charging power control signal to the storage battery. The charging device according to claim 1,
Furthermore, the charging device includes an AC adapter that supplies the device load power to the electric device and supplies the charging power to the storage battery. The charging device according to claim 2,
The charging device, wherein the charging power is an amount obtained by subtracting the device load power from the rated power of the AC adapter. The charging device according to any one of claims 1 to 3,
The electric device is a charging device which is a mobile phone. There is a charging circuit that receives power supply and supplies charging power to the storage battery,
A step of detecting a device load power and a charging power supplied to the electrical device by the comparison circuit;
The comparison circuit obtains a sum of the device load power and the charging power, and outputs a charging power control signal for adjusting the charging power based on the sum to the charging circuit;
The charging circuit comprising: a step of supplying the storage battery with the charging power according to the charging power control signal. The method for charging a storage battery according to claim 5,
Furthermore, the AC adapter supplies the apparatus load power to the electric device, and supplies the charging power to the storage battery. The method for charging a storage battery according to claim 6,
The method for charging a storage battery, wherein the charging power is an amount obtained by subtracting the device load power from the rated power of the AC adapter.

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