JPH1051964A - Charging section of electric equipment provided with secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charging section which can charge the secondary battery of electric equipment without receiving any influence from a reverse-current preventing diode. SOLUTION: A charging section for electric equipment provided with secondary battery is equipped with a terminal 21 for charging the secondary battery 20 of electric equipment provided with the battery 20 and a reverse-current preventing diode 22 connected between the battery 20 and terminal 21 for inhibiting the discharge from the charging terminal 21 of the battery. A short- circuit switch 23 which can cause a short circuit between both ends of the diode 22 is connected between both ends of the diode 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging section of an electric device having a secondary battery.

[0002]

2. Description of the Related Art In a portable electric device such as a portable terminal, a charging terminal is likely to be inadvertently exposed when used outdoors, so that there is a high possibility that the charging terminals are short-circuited. . Therefore, even if the charging terminal is short-circuited, the charging terminal of the portable electric device is not discharged from the secondary battery.
Generally, a backflow prevention diode is inserted in series between the secondary battery and the secondary battery.

[0003] That is, as shown in FIG.
In the electric equipment provided with the above, a backflow prevention diode 3 is inserted in series between the secondary battery 1 and the charging terminal 2. As a result, even if the charging terminals 2 and 2 are short-circuited, the discharge from the charging terminal 2 of the secondary battery 1 is prevented because of the backflow prevention diode 3. Further, in such an electric device, by attaching the charger 4 to the charging terminal 2, the secondary battery 1 can be charged through the backflow prevention diode 3 in the forward direction.

[0004] Such a backflow prevention diode is disclosed, for example, in Japanese Patent Application Laid-Open No. 2-237174 entitled "Portable Sign Light". FIG. 3 is a circuit diagram of the portable sign light described in the above-mentioned publication. In the figure, the portable sign light forms a solar cell 10, a secondary battery 11, a backflow prevention diode 12, a constant voltage diode 13, and a power consuming part. It is configured to include an LED 14 and the like.

When FIG. 3 is rewritten with a focus on the secondary battery 11, the result is as shown in FIG. It is apparent from FIG. 4 that the backflow prevention diode 12 has the same configuration as that of FIG. In this case, the secondary battery 11 is charged via the backflow prevention diode 12 when the solar cell 10 generates power.

[0006]

However, in the above configuration, charging is performed by the backflow prevention diode 3 (or 1).
2), there is a problem that precise charge control of the secondary battery 1 (or 11) cannot be performed. This is because a voltage drop called a forward voltage occurs in the backflow prevention diode 3 (or 12). In addition, the backflow prevention diode 3 (or 1
The forward voltage of 2) has a variation for each product, and the influence of this variation is
This is because it is directly reflected on the terminal voltage of (or 11).

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a charging unit that can perform charging without being affected by a backflow prevention diode in an electric device including a secondary battery.

[0008]

According to a first aspect of the present invention, there is provided a charging section for an electric device including a secondary battery, wherein the charging device for the secondary battery includes: a charging terminal for the secondary battery; A charging unit configured to include a backflow prevention diode connected between the secondary battery and the charging terminal to prevent discharge from the charging terminal, A short-circuit switch capable of short-circuiting both ends of the backflow prevention diode is provided at both ends. In the charging unit of the electric device including the secondary battery according to claim 2, in the charging unit of the electric device including the secondary battery according to claim 1, the short-circuit switch is exposed outside the electric device,
It is characterized by being provided to be operable from outside. In the charging unit of the electric device including the secondary battery according to claim 3, in the charging unit of the electric device including the secondary battery according to claim 1 or 2, the short-circuit switch includes a charging device connected to the charging terminal. It is configured to be opened and closed in conjunction with attachment / detachment of the charging device to / from the charging terminal, so that the charging device is turned on when attached and is turned off when the charging device is removed from the charging terminal. It is characterized by having.

According to the first aspect of the present invention, in a normal state, the short-circuit switch is turned off. In this case, even if the charging terminal is short-circuited for some reason, discharge from the charging terminal of the secondary battery is prevented by the backflow prevention diode. During charging, the short-circuit switch is turned on. In this case, both ends of the backflow prevention diode are short-circuited by the short-circuit switch. Therefore, charging is performed without passing through the backflow prevention diode. That is, charging is performed without being affected by the backflow prevention diode. According to the invention described in claim 2,
Since the short-circuit switch is provided so as to be switchable from outside the electric device, the on-off operation of the short-circuit switch is
It is easily done from outside the electrical equipment. According to the third aspect of the invention, when the charging device is mounted on the charging terminal, the short-circuit switch is turned on in conjunction with the mounting of the charging device. When the charging device is removed from the charging terminal, the short-circuit switch is turned off in conjunction with the removal of the charging device.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a charging section of an electric device having a secondary battery according to the present invention.

In FIG. 1, reference numeral 20 denotes a secondary battery. The secondary battery 20 is for supplying power to a not-shown consuming circuit of an electric device.

In FIG. 1, a charging section for the secondary battery 20 includes a charging terminal 21, a backflow prevention diode 22,
The short switch 23 is provided.

The charging terminal 21 is a terminal for charging the secondary battery 20, and is normally open. When charging the secondary battery 20, a charger (charging device) 24 is connected to the charging terminal 21.

The backflow prevention diode 22 is connected to the secondary battery 20.
Is connected in series between one of the electrode terminals and the charging terminal 21 on the one electrode terminal side. The backflow prevention diode 22 is used when the charging terminal 21 is short-circuited for some reason such as an accident.
Has a function of preventing discharge from the charging terminal 21.

The short-circuit switch 23 is provided across the backflow prevention diode 22 in parallel with the backflow prevention diode 22. This short-circuit switch 23
It is exposed to the outside of the electric device, and is provided so that the switching operation can be performed from outside. In particular, in the present embodiment, the short-circuit switch 23 is turned on when the charger 24 is attached to the charging terminal 21, and is turned off when the charger 24 is removed from the charging terminal 21. Thus, it is configured to be opened and closed in conjunction with attachment / detachment of the charger 24 to / from the charging terminal 21.

In the charging section having the above configuration, the short-circuit switch 23 is normally off. In this case, the backflow prevention diode 22
The function of preventing discharge from the charging terminal 21 of the secondary battery 20 is provided. Therefore, even if the charging terminal 21 is short-circuited for some reason such as an accident, the secondary battery 20 does not short-circuit.

During charging by the charger 24, the short-circuit switch 23 is turned on in conjunction with the mounting of the charger 24. In this case, both ends of the backflow prevention diode 22 are short-circuited by the short-circuit switch 23. Therefore, since charging is performed without the interposition of the backflow prevention diode 22, charging is performed without being affected by variations in the forward voltage of the backflow prevention diode 22. That is, at the time of charging, since there is no influence of the variation of the forward voltage of the backflow prevention diode 22, the charging voltage of the secondary battery 20 can be accurately monitored by the charger 24, Charging control is possible.

The charging section as described above has a large possibility of short-circuiting the charging terminal because the charging terminal is inadvertently exposed when used outdoors.
The present invention can be suitably applied to a portable electric device particularly requiring a backflow prevention diode.

[0020]

According to the charging section of the electric equipment provided with the secondary battery of the present invention, the following effects can be obtained. According to the charging unit of the electric device including the secondary battery according to claim 1, the short-circuit switch is provided at both ends of the backflow prevention diode, so that the short-circuit switch is normally turned off. The function of preventing discharge from the charging terminal of the secondary battery by the backflow prevention diode can be exhibited, and by turning on the short-circuit switch during charging, both ends of the backflow prevention diode are short-circuited to prevent backflow. Charging can be performed without being affected by the diode. According to the charging section of the electric device including the secondary battery according to the second aspect, the short-circuit switch is provided so as to be able to be switched from outside the electric device, so that the on-off operation of the short-circuit switch can be easily performed from outside. be able to. According to the charging unit of the electric device including the secondary battery according to the third aspect, the short-circuit switch is closed in conjunction with the attachment / detachment of the charging device to / from the charging terminal. A switch on / off operation can be achieved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram illustrating an embodiment of a charging unit of an electric device including a secondary battery of the present invention.

FIG. 2 is a circuit diagram illustrating an example of a conventional charging unit.

FIG. 3 is a circuit diagram showing another example of a conventional charging unit.

FIG. 4 is a circuit diagram obtained by rewriting the circuit diagram of FIG. 3 focusing on a secondary battery.

[Explanation of symbols]

 Reference Signs List 20 secondary battery 21 charging terminal 22 backflow prevention diode 23 short-circuit switch 24 charger (charging device)

Claims (3)

[Claims] 1. An electric device including a secondary battery, wherein a charging terminal for the secondary battery, and the secondary battery and the charging terminal for preventing discharge of the secondary battery from the charging terminal. And a backflow prevention diode connected between the backflow prevention diode, and a short-circuit switch capable of short-circuiting both ends of the backflow prevention diode is provided at both ends of the backflow prevention diode. A charging unit for an electric device including a secondary battery. 2. The charging section of an electric device provided with the secondary battery according to claim 1, wherein the short-circuit switch is exposed to the outside of the electric device and provided to be operable from outside. Charger for electrical equipment with secondary battery. 3. The charging section of an electric device provided with the secondary battery according to claim 1, wherein the short-circuit switch is turned on when a charging device is mounted on the charging terminal, and the charging terminal. A secondary battery that is configured to be opened / closed in conjunction with attachment / detachment of the charging device to / from the charging terminal so that the charging device is turned off when the charging device is removed from the battery. The charging section of the device.