JPH0851726A - Electronic apparatus - Google Patents

Abstract

PURPOSE:To reduce the initial power consumption of a primary battery by connecting the electrode terminal of the primary battery with a diode thereby preventing the primary battery from being charged through the charging circuit for a secondary battery. CONSTITUTION:A primary battery 5 15 connected through a diode 12 with an apparatus load 13. A charging circuit 20 is connected in parallel with the diode 12 and the primary battery 5 and the charging of the primary battery 5 is blocked by means of the diode 12. A secondary battery 1 is connected with the apparatus load 13 not through the diode 12. The charging circuit 20 is connected with the secondary battery 1 and the apparatus load 13. When the output from the primary battery 5 lowers, the diode 12 is short-circuited through a switch 16 to feed the terminal voltage of the primary battery 5 directly to the apparatus load 13. Since the voltage is increased by an amount corresponding to the voltage drop of the diode 12, the apparatus can be operated continuously. Since the charging circuit 20 is disconnected by means of the switch 16, the primary battery 5 is not charged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device used as a portable information terminal, a mobile phone or the like, which can use either a primary battery or a secondary battery as a power battery.

[0002]

2. Description of the Related Art In recent years, small and portable electronic devices such as portable information terminals and mobile phones have been widely used.
Some of these types of portable electronic devices use a secondary battery as a power battery and have a charging function.
Among the above electronic devices, those that can use the primary battery and share the battery storage part do not have a built-in charging circuit for the secondary battery in order to prevent charging of the primary battery. I was charging the battery.

On the other hand, an electronic device in which a primary battery can also be used as a power source battery and which has a built-in charging circuit for the secondary battery and a device for preventing charging of the primary battery is disclosed in Japanese Patent Laid-Open No. 5-184073. It is disclosed in the official gazette and is shown in FIG. This electronic device uses both a cylindrical primary battery and a secondary battery having the same outer shape, and shares the battery storage portion 21. The battery accommodating portion 21 has a semi-cylindrical shape, and inside thereof, a negative terminal 27 formed of a conductive spring member formed in a spiral shape and a positive terminal 28 formed of a conductive spring member formed in a U shape are arranged. Set up.

Further, in the electronic device of FIG. 8, an annular conductor 24 is embedded in the center of the insulating coating portion 23 on the side surface of the secondary battery,
The lower portion of the side surface of the secondary battery is covered with a conductive member, and a conductive portion 29 connected to the electrode of the secondary battery on the lower surface is provided. In addition, the detection terminal 26a is provided in the lower portion of the side surface of the battery storage portion 21,
Detecting terminals 26b, 26c made of a conductive spring member formed in a U shape at the center inside the side surface of the battery storage portion 21.
Is installed inside. Conductive part 2 when installing a secondary battery
9, detection terminal 26a, detection terminal 26b, annular conductor 2
4. The secondary battery is detected by connecting and energizing each of the detection terminals 26c, and disconnecting the charging circuit when the primary battery is installed.

[0005]

However, in the electronic device described in the prior art in which the primary battery and the secondary battery can be shared and the charging circuit is not built in, an external charging device is used to charge the secondary battery. The operation had to be troublesome.

In the one disclosed in Japanese Patent Laid-Open No. 5-184073 and shown in FIG. 8, an annular conductor is provided at the center of the insulating coating of the secondary battery to detect the secondary battery. There is a drawback that the structure of the battery housing and the secondary battery becomes complicated and the number of these parts increases. In addition, since the operation of the charging circuit is always stopped when the primary battery is installed, the charging circuit cannot be used as a power source instead of the battery in this case.

Furthermore, the initial output voltage of the dry battery used as the primary battery is 1.5V, whereas the initial output voltage of the nickel-cadmium battery used as the secondary battery is 1.2V. That is, since the output voltages of the both are different, the limit voltage for device operation is set lower than the output voltage of the secondary battery. As a result, the initial power consumption of the primary battery, which has a high initial output voltage, is large, and power is wasted.

The present invention can use both a primary battery and a secondary battery, is provided with a charging circuit for charging the secondary battery, prevents charging of the primary battery by the charging circuit even when the primary battery is installed, and An object of the present invention is to provide an electronic device capable of suppressing waste of power consumption due to a difference in output voltage between a primary battery and a secondary battery.

[0009]

In order to achieve the above object, an electronic device of the present invention accommodates both a primary battery and a secondary battery, and has at least a pair of electrode terminals consisting of a positive electrode terminal and a negative electrode terminal. And a pair of electrode terminals and an electrode terminal for a secondary battery that is independent of the pair of electrode terminals. In addition, in the state where the secondary battery is attached to the battery housing portion, the secondary battery is different from the primary battery in at least one of the electrode positions, and the secondary battery is connected to the dedicated electrode terminal for charging the secondary battery. And a diode connected to an electrode terminal of the primary battery to prevent the primary battery from being charged by the charging circuit.

Further, two primary batteries are housed in the electronic device, two pairs of electrode terminals consisting of a plus electrode terminal and a minus electrode terminal, and one electrode for a secondary battery independent of the electrode terminals are provided. The one provided with a battery housing portion internally having an electrode terminal is used. A switch is provided which short-circuits the diode and simultaneously disconnects the charging circuit.

[0011]

When a primary battery is mounted on the electronic device constructed as described above, it is connected to the device load via the diode. The charging circuit is connected in parallel with the diode and the primary battery, and the diode prevents charging of the primary battery. On the other hand, when the secondary battery is connected, it is connected to the device load without going through the diode. Further, the charging circuit is connected to the secondary battery and the device load.

When the output voltage of the primary battery drops,
By shorting the diode with the switch, the terminal voltage of the battery is directly supplied to the device load. At the same time, the switch disconnects the charging circuit, so the primary battery is not charged.

[0013]

The present invention will be described below with reference to the embodiments shown in the drawings. Hereinafter, in all the examples, only one of the primary battery and the secondary battery is incorporated in the battery storage portion.

The shape of the secondary battery 1 used in the electronic apparatus of this embodiment is shown in FIG. The secondary battery 1 contains therein two nickel-cadmium batteries or a nickel-hydrogen battery connected in series. The secondary battery 1 has an elliptical columnar outer shape, a disk-shaped negative electrode 2 made of a conductive member is embedded in a position deviated from the center of the upper surface, and a square-shaped positive electrode made of a conductive member is formed at the upper end of the back surface. The electrode 3 is embedded. Furthermore, the outer surface of the secondary battery 1 is covered with an insulating member 4 except for the electrode portion. Further, the plus electrode 3 is installed far enough apart from the minus electrode 2 so as not to short-circuit.

FIG. 2 shows the shape of the primary battery 5. As the primary battery 5, a commercially available dry battery is used. The outer shape of the primary battery 5 is cylindrical, and the positive electrode 6 is provided on the upper surface and the negative electrode 7 is provided on the lower surface. The outer surface of the primary battery 5 is covered with the insulating member 4 except for the electrode portion. The length of the major axis of the secondary battery 1 is twice the diameter of the electrode surface of the primary battery 5, and the minor axis is the same as the diameter of the electrode surface of the primary battery 5.

FIG. 3 shows the shape of the battery housing portion 8. The battery storage portion 8 is a box body having one side surface opened, and a negative terminal 1 shared by the secondary battery 1 and the primary battery 5 is provided inside the upper surface.
9 and a positive terminal 9 dedicated to the primary battery 5 are provided so as not to contact each other. On the other hand, a plus terminal 11 is provided inside the lower surface of the battery housing portion 8 so as to face the minus terminal 19 on the upper surface, and a minus terminal 10 is provided so as to face the plus terminal 9 on the upper surface. The minus terminal 10 and the plus terminal 11 are connected to each other and are used exclusively for the primary battery 5.

The minus terminals 19 and 10 are made of a conductive spring member formed in a spiral shape, and the plus terminal 9
And 11 are U-shaped conductive spring members. Further, here, the positive terminal 22 for the secondary battery is attached near the upper end inside the back surface of the battery housing portion 8.
The positive terminal 22 is composed of a U-shaped conductive spring member.

As shown in FIG. 4, when the secondary battery 1 is incorporated in the battery housing portion 8, the negative electrode 2 of the secondary battery 1 is connected to the negative terminal 19, and the positive electrode 3 is connected to the positive terminal 22. ing. As a result, the control circuit is energized from the secondary battery 1 via the minus terminal 19 and the plus terminal 22. The secondary battery 1 has an initial voltage of 1.2V.
In this case, two nickel-cadmium batteries or nickel-hydrogen batteries are built in series, and when incorporated in the battery housing portion 8, a power supply voltage of 2.4 V is obtained.

As shown in FIG. 5, two primary batteries 5 are accommodated in the battery accommodating portion 8 in parallel so that the directions of the electrodes are reversed. As a result, two primary batteries 5 having an initial voltage of 1.5V are mounted in series, and an output voltage of 3V can be obtained.

FIG. 6 shows a control circuit diagram of the electronic apparatus of this embodiment. In the figure, the portion of the control circuit 17 that encloses the battery with a dotted line means the battery housing portion 8. Here, in a state where the secondary battery 1 is incorporated in the battery housing portion 8, the positive electrode side of the secondary battery 1 is directly connected without the diode 12.
It is connected to the equipment load 13, and the negative pole side is connected to the ground 14. The charging circuit 20 is connected to the positive electrode side of the secondary battery 1 incorporated in the battery housing 8 via the connector 15a, and the negative electrode side of the charging circuit 20 is connected to the ground 14 via the connector 15b. ing.

In the case of the above configuration, the charging circuit 20 charges the secondary battery 1 and at the same time supplies power to the equipment load 13. When the charging circuit 20 is not connected, the secondary battery 1 supplies power to the device load 13. It should be noted that the electronic device main body of the present invention does not have the charging circuit 20 built therein and the charging circuit 20 is detachable, and the charging circuit 20 attaches the connectors 15a and 15b to the electronic device main body as required during charging. Connected through.

Next, the case where the two primary batteries 5 are incorporated in the battery housing portion 8 will be described with reference to FIG.
In this case, the positive electrode side of the primary battery 5 is connected to the device load 13 via the diode 12, and the negative electrode side is connected to the ground 14.

Further, since the charging circuit 20 is connected, when power is supplied from the outside, power is supplied from the external power source to the equipment load 13. At this time, the diode 12 blocks the charging of the primary battery 5. Has been done. Furthermore, if the charging circuit 20 is not connected, the primary battery 5 will be
Power is supplied to the device load 13 via.

A control circuit diagram in another embodiment of the present invention is shown in FIG. The control circuit 18 shown in the figure has the same configuration as that of the control circuit 17 described above, except for the portion to which the switch 16 described below is connected. Control circuit 18
Includes a movable piece 16a of the switch, a terminal 16b connected to the anode side of the diode 12, a terminal 16c connected to the cathode, and a terminal 16 connected to the charging circuit 20.
A switch 16 composed of d and d is provided.

In the assembled state of the primary battery 5, the switch 16 is connected to the terminals 16c and 16 by the movable piece 16a.
It is assumed that they are switched so that they are connected to d.
If the charging circuit 20 is connected here, the device load 13 is supplied with power from the charging circuit 20, and the diode 12 blocks charging of the primary battery 5. On the other hand, if the charging circuit 20 is not connected, power is supplied from the primary battery 5 and the device load 1
3 works.

In such a state, when the voltage supplied to the equipment load 13 via the diode 12 due to the exhaustion of the battery becomes lower than the operation limit voltage of the equipment, the switch 1
The movable piece 16a of No. 6 is switched so that the terminal 16b and the terminal 16c are connected. This allows the diode 1
2 is short-circuited, the terminal voltage of the primary battery 5 is directly supplied to the device load 13, and the voltage rises by the voltage drop of the diode 12, so that the device can be continuously used. Further, since the connection with the charging circuit 20 is cut off at the same time, the primary battery 5 is not charged.

Next, when the secondary battery 1 is installed, the switch 16 switches the movable piece 16a so as to connect the terminal 16c and the terminal 16d. If the charging circuit 20 is connected here, the device load 13 is supplied with power from the charging circuit 20, and at the same time, the secondary battery 1 is charged. On the other hand, the charging circuit 2
If 0 is not connected, the device load 1 by the secondary battery 1
3 works.

When the primary battery 5 is used and the charging circuit 20 is not used, power is supplied through the diode 12, so the current is limited by the internal resistance of the diode 12.
The current will be less than if the diode were shorted.
That is, the consumption of the primary battery 5 can be suppressed by interposing the diode 12.

[0029]

According to the electronic device of the present invention, both the primary battery and the secondary battery can be used by sharing the battery housing portion between the primary battery and the secondary battery, and the electronic device can be further downsized. It is valid. In addition, the diode can prevent erroneous charging of the primary battery by the charging circuit, and can be operated by an external power source even when the primary battery is installed, which is convenient.

Further, by connecting the diode, the initial power consumption of the primary battery can be reduced, and even when the primary battery is exhausted and falls below the operation limit voltage of the device, the diode connection is short-circuited by the switch. The applied voltage rises by the amount of voltage drop due to the diode, and the equipment can be used continuously. That is, the usage time of the primary battery can be extended and the primary battery can be effectively used.

[Brief description of drawings]

FIG. 1 is a perspective view of a secondary battery according to an embodiment of the present invention.

FIG. 2 is a perspective view of a primary battery according to an embodiment of the present invention.

FIG. 3 is a perspective view of a battery storage unit according to an exemplary embodiment of the present invention.

FIG. 4 is a perspective view in which a secondary battery is incorporated in the battery storage portion of the present embodiment.

FIG. 5 is a perspective view in which a primary battery is incorporated in the battery storage portion of the present embodiment.

FIG. 6 is a control circuit diagram of the present embodiment.

FIG. 7 is a control circuit diagram of another embodiment.

FIG. 8 is a perspective view in which a secondary battery is housed in a battery housing unit of a conventional example.

[Explanation of symbols]

 1 Secondary Battery 2, 7 Negative Electrode 3, 6 Plus Electrode 5 Primary Battery 8 Battery Storage Section 9, 11, 22 Plus Terminal 10, 19 Negative Terminal 12 Diode 13 Device Load 16 Switch 16a Movable Piece 16b, 16c, 16d Terminal 17 , 18 Control circuit 20 Charging circuit

Claims (3)

[Claims] 1. A primary battery and a secondary battery can be housed, at least a pair of electrode terminals consisting of a positive electrode terminal and a negative electrode terminal, and an electrode terminal for a secondary battery independent of the pair of electrode terminals. And a charging circuit for charging the secondary battery in a state in which the battery storage part internally installed and the secondary battery are attached to the battery storage part, and a connection between one electrode terminal of the primary battery and the charging circuit. An electronic device, comprising: 2. An electrode terminal for accommodating a plurality of primary batteries and having the same number of pairs of the primary batteries as a positive electrode terminal and a negative electrode terminal, and an electrode terminal for a secondary battery independent of the electrode terminals. 2. The electronic device according to claim 1, further comprising a battery storage part having therein. 3. The electronic device according to claim 1, further comprising a switch that short-circuits the diode and disconnects the charging circuit at the same time.