JPH11341126A - Ac charger for portable radio - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a high frequency current from flowing to an AC charger side and to stop lowering of an antenna gain by providing a contact for making conduction to both electrodes of a battery, a charge circuit part, and a ferrite material for high frequency current shielding provided to a connection part of the contact and the charge circuit part. SOLUTION: An AC charger for charging a battery is composed of a contacts 11 and 12 for making conduction to both electrodes of a battery, an AC charge circuit substrate 13, a metal wire 14 for connecting the contacts 11, 12 and the AC charge circuit substrate 13 and a case 15 for accomodating all this. The metal wire 14 goes through a ferrite core 21 for high frequency current shielding. This ferrite core 21 shields a high frequency current flowing to the charge circuit through the battery from a radio body. Thus, high frequency current distribution of the radio body is not disturbed and a gain of an antenna may not be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC charger for charging a battery of a portable wireless device.

[0002]

2. Description of the Related Art Conventionally, an AC charger for a portable radio has a configuration as shown in FIG. FIG. 6A is a front view of the charger, and FIG. 6B is a side view of the charger. According to FIG. 6, the AC charger for a portable wireless device has a "+" side contact 11 for establishing conduction with both poles of a battery,
"-" Side contact 12, AC charging circuit board 13,
A metal wire 14 for connecting the contacts 11, 12 and the AC charge circuit board 13, a case 15 for housing these,
AC fixed to the substrate 13 and drawn out of the case 15
It is composed of a power cord 16. The case 15 is provided with a concave portion 17 so as to stably hold the battery 24 or the portable wireless device with the battery 24 attached. When the battery 24 or the portable wireless device with the battery 24 attached is held in the recess 17, the “+” electrode 1 of the battery
8 is in contact with the “+” side contact 11 and conducts in a DC manner,
The "-" electrode 19 of the battery comes into contact with the "-" side contact 12 to conduct DC. When a voltage is supplied through the AC power cord 16, the circuit on the AC charge circuit board 13 operates, and DC is applied between the “+” and “−” contacts 11 and 12.
A voltage is generated. When the battery 24 or the portable wireless device on which the battery 24 is mounted is held in the concave portion 17 of the AC charger, the contacts “+” and “−” 11 and 12 respectively connect the battery “+” electrode 18 and the battery “−” electrode. Since the battery 19 is in contact with and conducts, a potential difference is generated between both electrodes of the battery, and charging is started.

[0003]

The user of a portable radio sometimes wears a battery and turns off the power of the radio.
Set to N and charge while waiting. However, in recent years, portable wireless devices have been reduced in size and weight in order to improve convenience, and circuit boards have also become smaller.

On the other hand, the antennas of portable wireless devices in the vicinity of the 800 MHz band and the 1.5 GHz band are often in a housed state, especially during standby, and helical antennas having a quarter wavelength are mainly used. This type of quarter-wave antenna operates integrally with the antenna element of the helical portion and a ground plane that forms a pair, and the radiation generated by the current distribution of the circuit board ground is large. However, as circuit boards have become smaller and grounds have become weaker,
The distribution of the ground current that contributes to the radiation of the antenna becomes non-uniform, and a portion where the impedance in a high frequency band becomes extremely low may appear. If the power supply terminal of the portable wireless device exists in this low-impedance portion, a high-frequency current flows out of the portable wireless device through the battery to the AC charger side, so that the current distribution is disturbed and the antenna gain is reduced.

[0005] When such a decrease in the antenna gain occurs, there is a drawback that the user who turns on the power of the radio device and charges while waiting for use becomes inconvenient due to the reduced sensitivity.

[0006]

Means for Solving the Problems To solve the above problems,
An AC charger according to the present invention is an AC charger for charging a battery provided in a portable wireless device, comprising: a contact for establishing electrical continuity with both poles of the battery; a charging circuit unit; A ferrite material such as a ferrite core, a ferrite sheet, and a ferrite chip bead disposed at a connection portion with the unit is provided. The ferrite material blocks a high-frequency current flowing from the wireless device main body to the AC charger side via the battery.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings. The present invention shown in FIG. 1 is an AC charger for charging a battery of a portable wireless device, comprising: a contact for establishing electrical continuity with both poles of the battery; an AC charging circuit board; It comprises a metal wire for connecting the charge circuit board and a case for housing the metal wire, and the metal wire penetrates the ferrite core. According to FIG. 1, the AC charger according to the present embodiment includes contacts 11 and 12 for establishing continuity with both poles of a battery and an AC charge circuit board 1.
3, metal wires 14 connecting the contacts 11, 12 and the AC charge circuit board 13, and a case 1 containing these
5 and the metal wire 14 is a ferrite core 2
1 through. With this ferrite core, high-frequency current flowing from the wireless device body to the charge circuit through the battery can be cut off. Therefore, the high-frequency current distribution of the wireless device main body is not disturbed, and the gain of the antenna does not decrease.

The present invention shown in FIG. 2 is an AC charger for charging a battery of a portable wireless device, comprising: a contact for establishing conduction between both electrodes of the battery; an AC charging circuit board; And a case in which these are provided, and a ferrite sheet is in contact with at least one side of the metal wires. According to FIG.
The AC charger according to the present embodiment includes contacts 11, 12 for establishing electrical continuity with both poles of the battery, an AC charge circuit board 13, and metal wires 14 connecting the contacts 11, 12 to the AC charge circuit board 13. A ferrite sheet 22 is in contact with at least one side of the metal wire 14. With this ferrite sheet, high-frequency current flowing from the wireless device body to the charge circuit through the battery can be cut off.
Therefore, the high-frequency current distribution of the wireless device main body is not disturbed, and the gain of the antenna does not decrease.

The present invention shown in FIG. 3 is an AC charger for charging a battery of a portable wireless device, comprising: a contact for establishing conduction with both poles of the battery; an AC charging circuit board; A metal wire for connecting the terminal and the AC charge circuit board, and a case for housing the metal wire, and a soldering portion between the board and the metal wire and an actual charger circuit portion on the board, A ferrite sheet is stuck on the wiring pattern of (1). According to FIG. 3, the AC charger according to the present embodiment has a contact 1 for establishing conduction with both poles of the battery.
1, 12; AC charge circuit board 13;
A metal wire 14 for connecting the AC charge circuit board 13 with the metal wires 1 and 12;
The ferrite sheet 22 was stuck on the wiring pattern 33 on the substrate, which was interposed between the soldering portion 31 between the substrate 13 and the metal wires 14 and the actual charger circuit portion 32 on the substrate. With this ferrite sheet, high-frequency current flowing from the wireless device body to the charge circuit through the battery can be cut off. Therefore, the high-frequency current distribution of the wireless device main body is not disturbed, and the gain of the antenna does not decrease.

The present invention shown in FIG. 4 is an AC charger for charging a battery of a portable wireless device. The AC charger includes a contact for establishing conduction with both poles of the battery, an AC charging circuit board, and the contact. A metal wire for connecting the terminal and the AC charge circuit board, and a case for housing the metal wire, and a soldering portion between the board and the metal wire and an actual charger circuit portion on the board, The ferrite chip beads are inserted and connected in series in the middle of the wiring pattern. According to FIG. 4, the AC charger according to the present embodiment includes contacts 11, 12 for establishing electrical continuity with both poles of the battery, an AC charge circuit board 13, and contacts 11, 12 and the AC charge circuit board 13.
And a case 15 that houses these, and a soldering portion 31 between the substrate 13 and the metal wire 14 and an actual charger circuit portion 32 on the substrate, The ferrite chip beads 23 were inserted in series in the middle of the wiring pattern 33 and connected. The ferrite chip beads 23 can cut off a high-frequency current flowing from the wireless device main body to the charge circuit through the battery. Therefore, the high-frequency current distribution of the wireless device main body is not disturbed, and the gain of the antenna does not decrease.

The present invention shown in FIG. 5 is an AC charger for charging a battery of a portable wireless device, comprising: a contact for establishing conduction with both electrodes of the battery; an AC charge circuit board; It is composed of a metal wire for connecting the terminal and the AC charge circuit board, and a case in which these are mounted, and is mounted on the board between a soldered portion between the board and the metal wire and an actual charger circuit section on the board. The aerial wiring wire is interposed, and the aerial wiring wire passes through the ferrite core. According to FIG. 5, the AC charger of the present embodiment connects the contacts 11 and 12 for establishing electrical continuity with both poles of the battery, the AC charge circuit board 13, and connects the contacts 11 and 12 and the AC charge circuit board 13. The substrate 13 and the metal wire 1 are constituted by a metal wire 14 to be
An aerial wiring wire 34 mounted on the board is interposed between the soldering part 31 with the P.4 and the actual charger circuit part 32 on the board, and the aerial wiring wire 34 passes through the ferrite core 21. I have. The ferrite core 21 can cut off a high-frequency current flowing from the wireless device main body to the charge circuit through the battery. Therefore, the high-frequency current distribution of the wireless device main body is not disturbed, and the gain of the antenna does not decrease.

[0012]

As described above, according to the present invention,
The power supply terminal must be placed where the ground of the circuit board of the portable wireless device becomes weak, the ground current distribution that contributes to the radiation of the antenna becomes uneven, and the impedance in the high frequency band becomes extremely low. Even in such a case, it is possible to prevent the high-frequency current from flowing from the portable wireless device to the AC charger through the battery. This can prevent a decrease in antenna gain.

[Brief description of the drawings]

1A and 1B are a front view and a side view, respectively, of a first AC battery charger according to the present invention.

2A and 2B are a front view and a side view of a second AC battery charger according to the present invention.

3A and 3B are a front view and a side view, respectively, of a third AC battery charger according to the present invention.

4A and 4B are a front view and a side view, respectively, of a fourth AC battery charger according to the present invention.

5A is a front view and FIG. 5B is a side view of a fifth AC battery charger according to the present invention.

FIG. 6 is a diagram of an AC battery charger showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 "+" side contact 12 "-" side contact 13 AC charging circuit board 14 metal wire 15 case 16 AC power cord 17 case recess 18 battery "+" electrode 19 battery "-" electrode 21 ferrite core 22 ferrite sheet 23 Ferrite chip beads 31 Solder part 32 Charger circuit part 33 Wiring pattern 34 Aerial wiring wire

Claims (1)

[Claims] 1. An AC charger for charging a battery provided in a portable wireless device, comprising: a contact for establishing electrical continuity with both poles of the battery; a charging circuit; and a contact circuit and a charging circuit. And a ferrite material for interrupting high-frequency current flowing out of the portable wireless device, the AC charger being provided at a connection portion of the portable wireless device.