JPH05146086A - Charger - Google Patents

Abstract

PURPOSE:To realize optimal quick charge while preventing overcharge. CONSTITUTION:The charger 20 comprises a charging system switch 22 providing a command for starting quick charge, a switching control section 23 for switching from standard charge to quick charge based on a switching signal fed from the switch 22, a standard charging section 24, and a quick charging section 25 having discharge function for performing quick charge after discharge, wherein standard charge and quick charge are combined such that the stand charge takes place in initial stage and then switched to quick charge through operation of the switch 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device for a storage battery (secondary battery) whose function can be regenerated by charging after discharging, and more particularly to a handy terminal (portable terminal).
・ Cadmium (Ni
-Cd) relates to a charging device such as a battery.

[0002]

2. Description of the Related Art In general, in the distribution industry, it is important to collect and process data related to merchandise in a timely manner and link it to the next merchandise sale, and systematization for this is adopted. This portable terminal device is a portable device used for entering data at door-to-door sales destinations and for entering inventory data for stores, warehouses, etc., and a portable device that can be operated with one hand is also called a handy terminal. There is. Generally, a secondary battery such as a Ni-Cd battery is often used as a power source for such a handy terminal. The characteristics of Ni-Cd batteries are that they have good large-current characteristics, excellent low-temperature characteristics, long cycle life, are resistant to overcharge, and are easy to maintain. Therefore, it is used in applications requiring high reliability, such as the above-mentioned handy terminal, as well as a standby power supply for communication or emergency. In addition, since the Ni-Cd battery can be used as a charger with a relatively simple circuit as compared with a lead battery, it is often used for applications with a small battery capacity and is widely used as a general storage battery. .. As a conventional charging method for a handy terminal, there is, for example, a contact charging method shown in FIGS. 3 is a side view showing a handy terminal and a charging adapter, FIG. 4 is a sectional view taken along the line AA ′ of FIG. 3, and FIG. 5 is a sectional view taken along the line BB ′ of FIG. Figure 3-
In FIG. 5, 11 is a handy terminal body, 12 is a communication adapter with a charging function, and the handy terminal body 11 is placed on the handy terminal placement surface 12a of the communication adapter 12 with a charging function during charging (FIG. 3). ..
Charging contacts 13 and 14 are provided at predetermined positions on the back surface 11a of the handy terminal main body 11, and the charging surface 13a of the communication adapter is provided with a protrusion for charging so as to come into contact with the charging contacts 13 and 14. Contacts 15, 16 are provided. When attempting to charge, placing the handy terminal 11 on the communication adapter 12 with a charging function will start charging.

[0003]

However, in such a conventional charging device, charging is started immediately when an electronic device such as a handy terminal is placed in the charger. As described above, when the handy terminal is frequently used for stocktaking or the like and the use of the terminal is repeatedly stopped, the charging is frequently triggered, and proper charging control cannot be performed, resulting in overcharging. When the storage battery is overcharged, it not only shortens its life, but also may generate heat or break down. That is, in the case of a quick charging device that rapidly charges a large current, a so-called −Δ is used to prevent overcharging.
The V detection method detects the charging state to stop the rapid charging, and the protection timer stops the rapid charging, but it is frequently used like a handy terminal.
In the case of electronic devices that are repeatedly prohibited from being used, charging may be triggered frequently, so appropriate switching control of charging current is required.
If the ΔV control or the like cannot be performed properly and the rapid charge is performed, the overcharge may occur. This is because quick charging starts immediately when the electronic device is placed. Then, it is clear that if the rapid charging is started at the time when the rapid charging is required, the appropriate rapid charging can be performed while preventing overcharging. An object of the present invention is to enable appropriate rapid charging at the time when the rapid charging is required.

[0004]

The means of the present invention are as follows. The standard charging means (see the block diagram of FIG. 1, the same applies hereinafter) is a standard charger that performs standard charging by the standard charging method. The quick charging means 2 is a quick charger that performs quick charging by a quick charging method, and has a discharging function that starts charging after discharging once in order to prevent overcharging and memory effect that tend to occur in rapid charging. Is preferred. The instruction means 3 is a changeover switch or the like for instructing the switching of the charging method. The control means 4 is a switching control circuit that controls switching between the standard charging means 1 and the quick charging means 2 based on the output of the instructing means 3.

[0005]

The operation of the means of the present invention is as follows. Standard charging means 1 for performing standard charging by the standard charging method and quick charging means 2 for performing rapid charging by the quick charging method are provided, and when the instructing means 3 gives an instruction to switch the charging method, the control means 4 gives an instruction. The standard charging means 1 and the quick charging means 2 are switched according to the switching instruction of the means 3. In this case, the standard charging by the standard charging means 1 may be started at the start of charging, and the quick charging by the quick charging means 2 may be switched to when the instruction by the instructing means 3 is given. Therefore, appropriate rapid charging can be performed at a necessary time.

[0006]

EXAMPLE An example will be described below with reference to FIG. FIG. 2 is a diagram showing an embodiment of the charging device. First, the configuration will be described. FIG. 2 is a block diagram of the charging device 20. In the figure, a charging device 20 includes a charging contact 21 electrically connected to an electronic device using a secondary battery such as a handy terminal, a charging method changeover switch 22 for giving an instruction to start quick charging, and a changeover switch. A switching control unit 23 that performs control to switch standard charging to quick charging by a switching signal from 22, a standard charging unit 24 that performs standard charging by the standard charging method, and a quick discharge function quick discharge method that performs quick charging after discharging by the quick charging method. Charging unit 25 and standard charging unit 24
And a power supply 26 for supplying a predetermined electric power to the quick charging unit 25 with a discharging function.

Next, the operation of this embodiment will be described. When the charging contact 21 is connected to the charging contact of the electronic device such as the handy terminal by mounting the electronic device such as the handy terminal, the standard charging unit 24 is triggered and the standard charging is started.

When rapid charging is necessary, for example, when the user wants to use it immediately, the user operates the changeover switch 22. When the changeover switch 22 is operated, the changeover control section 23 receives this changeover signal and receives the changeover signal from the standard charging section 2 during the charging operation.
The operation of No. 4 is stopped, the operation is switched to the quick charging unit with a discharging function 25, and the operation of the rapid charging unit with a discharging function 25 is started. The quick charging unit 25 with a discharging function
In order to prevent the memory effect, first the discharge is started, and after the discharge end voltage is detected, the rapid charge is started.

As described above, the charging device 20 is
A charging method changeover switch 22 that gives an instruction to start quick charging, a changeover control unit 23 that performs control to change standard charging to quick charge by a changeover signal from the changeover switch 22, a standard charging unit 24 that performs standard charging, and a discharge Since the rapid charging unit with a discharging function 25 for performing the subsequent rapid charging is provided, the standard charging and the rapid charging are mixed, and at the beginning of the charging, the standard charging is performed and the switch 22 is operated to switch to the rapid charging. Even a device such as a handy terminal that is frequently used and repeatedly stopped can prevent frequent charging triggers from being overcharged and can be used for quick charging in the contact charging method.

In this embodiment, an example in which a handy terminal is used as an electronic device using a charging device has been shown, but it goes without saying that it can be applied to any electronic device (for example, a notebook personal computer or a mobile phone). ..

[0011]

According to the present invention, since the standard charging unit for charging by the standard charging system and the rapid charging unit for charging by the rapid charging system are provided, it is possible to perform appropriate rapid charging while preventing overcharging. it can.

[Brief description of drawings]

FIG. 1 is a block diagram of the present invention.

FIG. 2 is a block diagram of a charging device.

FIG. 3 is a diagram showing a handy terminal and a charging adapter.

FIG. 4 is a sectional view taken along the line A-A ′ in FIG.

5 is a cross-sectional view taken along the line B-B ′ of FIG.

[Explanation of symbols]

 20 Charging Device 21 Charging Contact 22 Changeover Switch 23 Changeover Control Section 24 Standard Charging Section 25 Rapid Charging Section with Discharge Function 26 Power Supply

Claims (2)

[Claims] 1. A charging device comprising a standard charging unit for charging a storage battery by a standard charging system and a quick charging unit for charging a storage battery by a rapid charging system. 2. A standard charging means for performing standard charging by a standard charging method, a quick charging means for performing rapid charging by a quick charging method, an instruction means for instructing switching of charging methods, and an output based on the output of the instructing means. A charging device comprising: a control unit that controls switching between the standard charging unit and the quick charging unit.