JP2539979Y2 - Electronics - Google Patents

Description

Present invention [relates] [devised DETAILED DESCRIPTION a nickel - cadmium battery (N _i -C _d batteries)
The present invention relates to an electronic device such as a handheld computer and a small personal computer using the same.

The [prior art] Generally, in an electronic equipment using N _i -C _d batteries, N _i -C _d
When the charge and shallow discharge N _i -C _d batteries are repeatedly performed by using a battery, reduction in capacity called memory effect occurs and the discharge characteristics as indicated at C ₁ in Fig. 4 Become. If such memory effect occurs, by performing a deep discharge, N _i -C _d discharge characteristics of the battery 4
Recovered as indicated at C ₂ in FIG, It is known that return to normal capacity.

By the way, conventionally, in order to prevent the occurrence of the memory effect, a discharge special device, which is easily provided separately from electronic devices, is used.
N _i -C had to perform a deep discharge _d batteries. That is, the user deeply discharged N _i -C _d battery discharger N _i -C _d batteries, for example, detached from the electronic apparatus main body, and thereafter,
N _i -C or _d batteries charged at charger attaching it to the electronic apparatus body, or a N _i -C _d battery performs charging by connecting the charger after mounting the electronic apparatus main body, thereby , N _i
A -C _d battery had been allowed to recover to the normal capacity.

[Problems to be solved by the invention]

However, in the conventional electronic apparatus described above, is prepared separately from the discharge vessel to the electronic components in order to prevent the occurrence of the memory effect, the user intentionally discharging operation N _i -C _d batteries using the discharger However, there is a disadvantage that the operation is complicated.

The present invention is intended to prevent the occurrence of memory effects.
And its object is to provide a good electronic equipment operability capable of performing the discharge of the N _i -C _d batteries without the user's awareness.

[Means for solving the problem]

The present invention in order to achieve the above object, an electronic apparatus using the N _i -C _d batteries, charging of N _i -C _d battery, and control means for controlling the discharge, the discharge of the N _i -C _d batteries and discharging means for performing is provided in the electronic device body or N _i -C _d batteries,
The control unit controls the discharging unit to perform discharging when the charging unit is connected to the electronic device, and causes the charging unit to perform charging when detecting that deep discharging has been performed by the discharging unit. Is controlled in such a manner.

[Action]

The electronic apparatus having the above configuration, when connecting the charging unit to the electronic apparatus, automatically performs discharging of N _i -C _d batteries,
After the deep discharge is automatically performed, the charging is performed by the charging means, thereby preventing the memory effect from occurring.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of an electronic device according to the present invention, and FIG. 1 shows a case where the electronic device is a handheld computer. Referring to FIG.
The electronic device according to the present embodiment includes a processor 1 and a processor 1.
, A RAM 3 used as a work area of the processor 1, a display unit 4 such as a liquid crystal display (LCD), and a keyboard 5.
, A printer 6, a communication control unit 7, and a power source, ie, _Ni.
And a power control unit 9 that performs control relating -C _d batteries 8.

Figure 2 is a diagram showing an example of configuration of a power supply control section 9, the power source control unit 9, each part of the electronic apparatus main body a voltage V of the N _i -C _d cells 8, i.e. the processor 1, ROM 2, RAM 3, the display Unit 4, keyboard 5, printer 6, load terminal LD for supplying to communication control unit 7, and input terminal IN to which charger 10 is detachably connected.
A charge / discharge switching unit 11 for switching between charge / discharge;
A voltage detecting unit 12 for detecting the voltage V of the N _i -C _d battery 8, a voltage comparator 13 for comparing the detected voltage V and the specified voltage V _TH,
Result of the comparison, when the voltage V is less than the prescribed voltage V _TH N _i -C _d
And a discharging unit 14 for discharging the battery 8.

Next, the operation of the electronic device having such a configuration will be described with reference to the flowchart of FIG. In the present embodiment, when the charger 10 is connected to the input terminal IN of the power control unit 9 (step S
1), the power supply control unit 9 automatically perform the discharge of the N _i -C _d batteries. That is, at the time of connecting the charger 10, the charging / discharging switching unit 11, the discharge side is switched to, the connection of the charger 10 is performed, the voltage detection unit 12, N _i -C _d batteries 8 Is detected (step S2). Next, the voltage comparison unit 13
Then, the detected voltage V is compared with the specified voltage _VTH (step S3). As a result, when the voltage V has a specified voltage V _TH or more, to discharge the N _i -C _d cells 8 in the discharge unit 14 (step S4). Note that even during this discharge, the voltage detection unit 12 and the voltage comparison unit 13 always use N _i
And performing detection of the voltage V of -C _d battery 8 (step S
5), as a result of discharging by the discharging unit 14, the voltage V becomes the specified voltage V _TH
When it is detected that the battery has been deeply discharged (step S3), the charge / discharge switching unit 11 switches to the charge side, and N _i
-C _d battery 8 is charged by charger 10 (step S
6). Thus, it is possible to prevent the memory effect of the N _i -C _d batteries 8 in advance.

Thus, in this embodiment, the remembering discharge function to prevent the memory effect of the N _i -C _d battery 8 to the power supply control unit 9, the electronic device, i.e. by connecting the charger 10 to the power supply control unit 9, deep discharge against N _i -C _d cells 8 are automatically performed, then since the charging by the charger 10 is performed, it is not necessary user consciously perform discharge operation, therefore, compared with the conventional It is possible to prevent the occurrence of the memory effect by a very simple operation.

In the above-described embodiment, the discharge function is provided by the electronic device main body,
That although imparted to the power source control unit 9, it may be imparted above-described discharge function to N _i -C _d batteries 8.

[Effect of the invention]

According to the present invention as described above, by connecting the charging unit to the electronic apparatus, the discharge of the N _i -C _d cell is performed automatically, by the charging means after the deep discharge is automatically made Since the charging is performed, the discharging for preventing the occurrence of the memory effect can be performed without the user being conscious, and the operability can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of an electronic device according to the present invention, FIG. 2 is a diagram showing a configuration example of a power supply control unit, and FIG. 3 explains the operation of the electronic device in FIGS. flow chart for, FIG. 4 is a graph showing the discharge characteristics of the N _i -C _d batteries. 1 ...... processor, 2 ...... ROM, 3 ...... RAM, 4 ...... display unit, 5 ...... keyboard, 6 ...... printer, 7 ...... communication control unit, 8 ...... N _i -C _d batteries, 9 ... ... Power control section, 10 ... Charger, 11 ... Charge / discharge switching section, 12 ... Voltage detection section, 13
…… Voltage comparison part, 14 …… Discharge part

Claims (1)

(57) [Scope of request for utility model registration] In an electronic device using a Ni-Cd battery having a built-in discharging means, control means for controlling charging and discharging of the Ni-Cd battery is provided. When the charging means is connected, control is performed to cause the discharging means provided in the Ni-Cd battery to perform discharging, and when it is detected that deep discharging has been performed by the discharging means, the charging means is charged. An electronic device characterized in that the electronic device is controlled to perform the operation.