JPH08205413A - Structure of charger and portable terminal unit - Google Patents

Abstract

PURPOSE: To prevent the short-circuit by inhibiting the conduction of wirings between the electrode of a battery and a battery side charging terminal when the portable terminal unit is removed from the charger. CONSTITUTION: When a portable telephone set 21 is mounted on a charger 32, a battery side charging terminal 5a is connected to a charger side charging terminal 11a, and a reed switch (LS) 23 is moved to the position nearest to a permanent magnet 30 provided in the charger 32. Thus, the contacts 28a and 28b of the LS 23 are attracted into contact by different magnetic fields to conduct wirings 7a. The electrode 2a is connected to the terminal 5a, and a chargeable battery 2 is charged from AC power terminals 13a, 13b. Then, when the telephone set 21 is removed from the charger 32, the magnet 30 of the LS 23 is removed together with the charger 32. Thus, the ferromagnetic leads 26a, 26b of the LS 23 are demagnetized at the fields, the contacts 28a, 28b are separated by the elastic recoiling forces of a coupling wire member 29 to be returned to the original positions to inhibit the conduction of the wirings 7a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a mobile phone,
The present invention relates to a structure of a charger and a mobile terminal device for charging a rechargeable storage battery used in a mobile terminal device such as a cordless telephone handset.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing an internal structure of a portable terminal device 1 such as a slave unit of a conventional portable telephone or a cordless telephone. In the figure, reference numeral 2 is a rechargeable storage battery, and this rechargeable storage battery 2 has electrodes 2a and 2b. Reference numeral 3 is a main body circuit, and this main body circuit 3 is a rechargeable storage battery 2
Power is supplied from the electrodes 2a and 2b of the above to control the main body.

These rechargeable storage battery 2 and main circuit 3
Are stored in the casing 1 a of the mobile terminal device 1. The casing 1a has battery-side charging terminals 5a and 5b.
Is provided between the battery side charging terminals 5a and 5b and the electrodes 2a and 2b of the rechargeable storage battery 2, respectively.
7b are connected and arranged.

When charging the rechargeable storage battery 2 of the portable terminal device 1 as described above, the portable terminal device 1 is mounted on the charger 10 as shown in FIG.
a and 5b are charger side charging terminals 11a and 11 of the charger 10.
The rechargeable storage battery 2 is charged with the AC power source from the AC power source terminals 13a and 13b.

In FIG. 7, reference numeral 15 is a charging circuit and 16 is a charging circuit.
Is a display LED that lights up during the charging operation of the charger 10 and informs that charging is currently being performed.

Since the battery-side charging terminals 5a and 5b of the portable terminal device 1 are exposed to the outside, as shown in FIG. When the metal member 18 such as a necklace contacts both of the battery side charging terminals 5a and 5b, the pair of positive and negative terminals 5a and 5b may be electrically connected to cause a short circuit.

When this happens, the metal member 18 such as a necklace generates heat due to its resistance, and if overheated, there is a risk that the clothes may be burnt or burned. Rechargeable storage battery 2
The battery capacity of will be used up and may be consumed and discharged.

When a pair of charging terminals 5a and 5b are electrically connected by a metal member having a low resistance value such as a copper wire instead of a metal having a high resistance value such as a necklace, energization should be immediately prohibited. Some special switching elements (polyswitches, etc.) are provided, but even in such a case, the metal member 18 having a high resistance value does not operate immediately and solves the above problems. It is not possible.

In order to solve such a problem, conventionally, the following method has been adopted.

(1) By inserting a diode in the middle of the wiring 7a or 7b, the current is allowed to flow in one direction at the time of charging, but the current is prevented from flowing backward in the other direction at the time of short circuit. A method to prevent a metal member such as a necklace from generating heat.

(2) By forming the casing 1a around the battery-side charging terminals 5a and 5b into a concave shape such as a groove or a hole, a metal member such as the necklace can be easily connected to the battery-side charging terminal. Method to prevent short circuit by not contacting 5a and 5b (Actual flat blade 3-10
4957).

(3) In the middle of the wiring 7a or 7b, the current flowing through the battery side charging terminals 5a, 5b and the rechargeable storage battery 2
A method of connecting a protection circuit that detects the voltage applied to the circuit and protects it from short circuits.

(4) A mechanical switch that can be externally operated is provided in the middle of the wiring 7a or 7b, and the switch is turned off except when charging the wiring 7a or 7b.
A method to prevent a short circuit by preventing current from flowing into the circuit.

[0014]

However, in the conventional method of the above (1), the insertion loss of the diode is added to the applied voltage at the time of charging, and due to the characteristics of the diode,
Since the insertion loss changes depending on the flowing current and temperature conditions, it becomes impossible to control the applied voltage accurately. For this reason, there is a problem that it cannot be used for charging a battery such as a lithium-ion battery that has severe charging conditions.

Further, in the conventional method of the above (2),
Although it is easy to form a short circuit, the capacity voltage of the rechargeable storage battery 2 is still applied to the battery-side charging terminals 5a and 5b.
If a metal member enters the concave portion having 5b, there is a possibility of short-circuiting, and this does not solve the fundamental problem.
Further, there is a problem that the shape of the mobile terminal device 1 becomes complicated and the manufacturing cost increases.

Further, in the conventional method of the above (3),
Since a protection circuit for detecting a current or a voltage and protecting it from a short circuit is provided, there is a problem that the number of parts increases and the cost increases, which hinders cost reduction and downsizing of the mobile terminal device 1.

Further, in the conventional method of the above (4), a short circuit is prevented if the current is interrupted by a poor mechanical contact to hinder charging, or if the user forgets to turn off the mechanical switch by mistake. There is a problem that you can not.

On the other hand, the battery-side device is provided with a convex portion, and the convex portion turns on the switch on the charger side when it is mounted on the charger.
By doing so, there is one in which the circuit inside the charger is closed to enable charging (Japanese Utility Model Laid-Open No. 3-39344).
This conventional charging device is intended to prevent a metal member from contacting between a pair of charging terminals on the charger side to cause a short circuit, and is intended to prevent a short circuit between charging terminals of a battery side device. Not a thing.

In view of the above problems, the present invention prevents the energization of the wiring between the electrode of the battery and the charging terminal on the battery side when the portable terminal device is detached from the charger, and Even if a pair of battery-side charging terminals are electrically connected by a metal member, current does not flow, and a structure of a charger and a mobile terminal device is provided which prevents the metal member attempting to cause a short circuit from overheating. The task is to do so.

[0020]

In order to solve the above problems, the structure of the charger and the portable terminal device according to the present invention is as follows.
It has the following configuration.

(1) In a charger for supplying electric power to a portable terminal device and a portable terminal device charged by connecting to the charger, the charger includes a charger side charging terminal, and the portable terminal device is provided. Is a casing portion for accommodating a rechargeable storage battery having an electrode therein, a battery side charging terminal which is provided in the casing portion and is connected to a charger side charging terminal of an external charger when charging the rechargeable storage battery, and Wiring arranged between the electrode of the rechargeable storage battery and the battery side charging terminal, and provided in the middle of the wiring, and is turned on when the battery side charging terminal is connected to the charger side charging terminal, Switch means that is turned off when the battery side charging terminal is not connected to the charger side charging terminal, and the charger has means for operating the switch means,
The switch means operates as a switch without contact with the charger.

(2) In the structure of the charger and portable terminal equipment of the above means (1), the magnetic means is arranged on the charger side, and the switch means is operated by the magnetic means.

(3) In the structure of the charger and the portable terminal equipment of the above means (2), the switch means is a reed switch.

(4) In the structure of the charger and the portable terminal device of the above means (2), the magnetic means on the charger side is an electromagnet.

[0025]

According to the structure of the charger and the mobile terminal device having such a configuration, the switch means provided between the electrodes of the rechargeable storage battery and the battery-side charging terminal, which is provided in the middle of the wiring, is used during charging. It is turned on, and it is OF when not charging.
Since it becomes F, the wiring can be energized only during charging and the charging can be performed, and the energization in the wiring is prohibited except during charging, and a metal member is provided between the pair of battery side charging terminals. As a result, a current does not flow in the wiring even when electrically connected, so that it is possible to reliably prevent the metal member from overheating due to a short circuit.

Since a member having an insertion loss such as a diode is not provided in the middle of the wiring, the applied voltage can be accurately controlled at the time of charging, and it can be used for a battery such as a lithium-ion battery under severe charging conditions. It will be possible. Further, since the switch means is turned off when the battery is not charged, it is possible to prevent the capacity voltage of the rechargeable storage battery from remaining applied to the battery side charging terminal. Further, since an expensive protection circuit is not provided, it is possible to contribute to cost reduction and downsizing of the mobile terminal device.

Further, since the switch means is operated by a non-contact operation, the charging is not hindered due to poor contact unlike a mechanical switch, and the reliability of the product is improved. Further, since the switch means is automatically turned off when the battery is not charged, there is no forgetting to turn it off like a mechanical switch.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views for explaining a first embodiment of the structure of a charger and a mobile terminal device according to the present invention. The description of the same configuration as the conventional one will be omitted, and the same reference numerals will be used for the same components as the conventional one.

FIG. 1 is a diagram showing the internal structure of a mobile phone 21 according to the first embodiment of the structure of the charger and the mobile terminal device according to the present invention. In the mobile phone 21, the electrode 2 of the rechargeable storage battery 2 housed in the casing 21a thereof
a and the battery side charging terminal 5 provided on the casing 21a
A reed switch 23 is provided in the middle of the wiring 7a arranged between the reed switch 23a and the wiring a.

The reed switch 23 has a structure as shown in FIG. As shown in the figure, the reed switch 2
3 is covered with a glass tube 25, and ferromagnetic leads 26a and 26b are provided at both ends of the glass tube 25, and the ferromagnetic leads 26a and 26b are connected to the wiring 7 respectively.
connected to a.

A chamber 27 containing nitrogen gas is formed inside the glass tube 25, and the ends of the pair of ferromagnetic leads 26a and 26b project into the chamber 27.
Contact points 28a and 28b are connected to the ends of the ferromagnetic leads 26a and 26b in the chamber 27 at positions separated from each other. Ferromagnetic leads 26a, 26b and contact point 28
a and 28b are each a connecting wire member 29 having elasticity.
Are connected by.

As shown in FIG. 3, such a reed switch 23 is ferromagnetic when a magnetic field is applied from the outside by a magnet 30 arranged in the vicinity in parallel with the length direction of the ferromagnetic leads 26a and 26b. The leads 26a, 26b are magnetized by different magnetic fields, and the corresponding contact portions 28a, 28
b attracts each other and comes into contact with each other, thereby enabling energization over the entire length of the wiring 7a.

When the magnetic field is erased by removing the magnet 30, the magnetic fields of the ferromagnetic leads 26a and 26b are also erased, and the elastic restoring force of the connecting wire member 29 causes the contact points 28a and 28b.
Can separate from each other and return to their original positions to prohibit energization in the wiring 7a.

When charging the rechargeable storage battery 2 of the mobile phone 21 having the reed switch 23 in the middle of the wiring 7a, the mobile phone 21 is attached to the charger 32 as shown in FIG. , The battery side charging terminals 5a and 5b are connected to the charger side charging terminals 11a and 11b, and the charger 32
This is performed by supplying AC power to the device and charging operation.

When the charging of the mobile phone 21 is completed in the charger 32 and the battery side charging terminal 5a and the charger side charging terminal 11a are completely connected, the reed switch 23 is installed in the charger 32 permanently. It comes closest to the magnet 30. At this time, the reed switch 23 and the permanent magnet 30
3 has a positional relationship as shown in FIG. 3, so that the contact portions 28a and 28b of the reed switch attract each other by different magnetic fields and come into contact with each other, thereby enabling energization over the entire length of the wiring 7a.

Therefore, the electrode 2a of the rechargeable storage battery 2 and the battery side charging terminal 5a are electrically connected, and the AC power supply terminal 1
The rechargeable storage battery 2 can be charged by the AC power source from 3a and 13b. At this time, the display LED 16 connected to the charging circuit 15 illuminates light to inform that the charging operation is currently being performed.

After charging, the mobile phone 21 is charged with the charger 32.
When removed from the reed switch 23, the permanent magnet 30 located closest to the reed switch 23 is also removed together with the charger 32. Therefore, the magnetic leads 26a and 26b of the reed switch 23 are erased from the magnetic field, and the connecting wire member 29 is removed.
By the elastic restoring force of the contact points 28a and 28b, the contact points 28a and 28b are separated from each other and returned to their original positions to prohibit the energization of the wiring 7a.

Therefore, when the mobile phone 21 is put in a pocket or the like, even if the battery-side charging terminals 5a and 5b are electrically connected by a metal member such as a necklace, no current flows through the wiring 7a. Therefore, it is possible to reliably prevent the metal member from overheating due to a short circuit.

FIG. 5 is a diagram showing a second embodiment of the structure of the charger and the portable terminal device according to the present invention. The charger 32 is provided with the permanent magnet 30 in the first embodiment, while the second embodiment is different in that the charger 34 is provided with the electromagnet 35. This electromagnet 35 uses the AC power source used for charging as a power source, and
A magnetic field is generated only when AC power is supplied to the C power supply terminals 13a and 13b.

Therefore, during charging, the AC power supply terminal 13a,
As when the outlet connected to 13b is disconnected, A
When the mobile phone 21 is left attached to the charger 34 to which the C power is not supplied without noticing it, a current flows backward from the rechargeable storage battery 2 to the charger 34 during charging. LED1 indicating that
It is possible to prevent the lighting of 6 and the discharge of the rechargeable storage battery 2.

By the way, in the above-mentioned embodiment, since the reed switch 23 which is turned on and off depending on the presence or absence of a magnetic field is used, the reed switch 23 may be turned on when a magnetic material such as a magnetic necklace or electric van (trade name) approaches. There is. However, such a thing is extremely rare, and at the same time, it is even more rare that the two battery-side charging terminals 5a and 5b are contacted so that the metal member electrically connects them. As such, it doesn't seem to matter much. If it is desired to prevent this, it is sufficient to use a reed switch 23 that operates in a magnetic field considerably stronger than 800 to 1200 Gauss.

Although the reed switch operated by the magnetic field is used in the above embodiment, it is magnetically turned on and off.
Other switches such as a reed relay may be used as long as the F operation can be performed. Further, as long as the switch means can operate in a non-contact manner, it does not necessarily have to operate magnetically like a reed switch.

Further, in the above embodiment, the description has been given of the case where the portable terminal device for directly accommodating the storage battery inside the casing is attached to the charger for charging, but the battery pack for accommodating only the storage battery from the portable terminal device is described. Needless to say, the present invention can be applied to a detachable battery pack even when the battery pack is mounted on a charger for charging.

[0044]

As described above, according to the present invention, the switch means, which is arranged between the electrode of the rechargeable storage battery and the battery-side charging terminal and is provided in the middle of the wiring, is turned on at the time of charging to charge the battery. Since it is turned off at times other than hours,
Only when charging, the wiring can be energized to allow charging, and when not charging, energization of the wiring is prohibited and the pair of battery-side charging terminals are electrically connected by a metal member. Even if this is done, no current flows through the wiring, so it is possible to reliably prevent the metal member from overheating due to a short circuit.

Further, since a member having an insertion loss such as a diode is not provided in the middle of the wiring, it is possible to accurately control the applied voltage at the time of charging, and it can be used for a battery such as a lithium-ion battery under severe charging conditions. It will be possible. Further, since the switch means is turned off when the battery is not charged, it is possible to prevent the capacity voltage of the rechargeable storage battery from remaining applied to the battery side charging terminal. Further, since an expensive protection circuit is not provided, it is possible to contribute to cost reduction and downsizing of the mobile terminal device.

Further, since the switch means is operated by a non-contact operation, the charging is not hindered by a contact failure unlike a mechanical switch, and the reliability of the product is improved. Further, since the switch means is automatically turned off when the battery is not charged, there is no forgetting to turn it off like a mechanical switch.

Further, according to the second embodiment, as in the case where the outlets connected to the AC power supply terminals 13a and 13b are disconnected during charging, it is not noticed on the charger 34 to which AC power is not supplied. Without the mobile phone 21, the rechargeable storage battery 2 to the charger 3
It is possible to prevent lighting of the display LED 16 that indicates that charging is being performed and discharge of the rechargeable storage battery 2 that occur due to reverse flow of current to the battery 4.

[Brief description of drawings]

FIG. 1 is a diagram showing an internal structure of a mobile phone 21 according to a first embodiment of the structure of a charger and a mobile terminal device according to the present invention.

FIG. 2 is a diagram showing a structure of a reed switch 23.

FIG. 3 is a diagram showing an operating principle of a reed switch 23.

FIG. 4 is a diagram showing a case where a rechargeable storage battery 2 of a mobile phone 21 is charged.

FIG. 5 is a diagram showing a second embodiment of the structure of the charger and the mobile terminal device according to the present invention.

FIG. 6 is a diagram showing an internal structure of a general mobile phone 1.

FIG. 7 is a diagram showing a case where the rechargeable storage battery 2 of the mobile phone 1 is charged.

FIG. 8 is a diagram showing a case where a metal member 18 such as a necklace comes into contact with the charging terminals 5a and 5b of the mobile phone 1 to cause a short circuit.

[Explanation of symbols]

 1 portable terminal equipment 1a casing 2 rechargeable storage battery 2a, 2b electrode 3 body circuit 5a, 5b battery side charging terminal 7a, 7b wiring 10 charger 11a, 11b charger side charging terminal 13a, 13b AC power terminal 15 charging circuit 16 display LED 18 Metal member 21 Mobile phone 21a Casing 23 Reed switch 25 Glass tube 26a, 26b Ferromagnetic reed 27 Room 28a, 28b Contact part 29 Connecting wire member 30 Permanent magnet 32, 34 Charger 35 Electromagnet

Claims (4)

[Claims] 1. A charger for supplying electric power to a mobile terminal device, and a mobile terminal device charged by connecting to the charger, wherein the charger includes a charger-side charging terminal, and the mobile terminal device is A casing portion that accommodates a rechargeable storage battery having an electrode therein, a battery-side charging terminal that is provided in the casing portion and is connected to a charger-side charging terminal of an external charger when charging the rechargeable storage battery, and the charging Wiring arranged between the electrode of the battery and the charging terminal on the battery side, and provided in the middle of the wiring, and turned on when the charging terminal on the battery side is connected to the charging terminal on the charger side, Switch means that is turned off when the side charging terminal is not connected to the charger side charging terminal, the charger has means for operating the switch means, and the switch means is A structure of a charger and a mobile terminal device, which are switch-operated by non-contact with the charger. 2. The structure of the charger and the mobile terminal device according to claim 1, wherein a magnetic means is arranged on the charger side, and the switch means uses a switch operation by the magnetic means. . 3. The structure of the charger and the mobile terminal device according to claim 2, wherein the switch means is a reed switch. 4. The structure of the charger and the mobile terminal device according to claim 2, wherein the magnetic means on the charger side is an electromagnet.