JP2000151252A - Radio communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a radio communication device small-sized and light in weight in the radio communication device with a configuration in which diversity receiving is performed by a main antenna and a sub antenna and a battery is also charged by a non-contact system charging method. SOLUTION: An impedance element 19 is connected to a power incoming coil 12 operating as a power receiving part when it is charged according to a non-contact system, and a resonance circuit 20 is formed so that the coil 12 can resonate in 800 MHz band for radio communication of a high frequency. Because the coil 12 is used both as the power receiving part when a battery is charged and as a sub antenna for dedicated receiving to capture radio waves, it is possible to reduce the number of parts for sub antennas such as a dielectric printed antenna and a flat antenna which are needed in the conventional configuration to perform diversity receiving.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power receiving coil that resonates at a charging frequency, and a battery that is charged by electromagnetically inductively coupling the power receiving coil to a power transmitting coil provided in a charging device. The present invention relates to a wireless communication apparatus configured to perform diversity reception using a dual-purpose main antenna and a reception-only sub-antenna.

[0002]

In recent years, with the advance of telecommunication technology, wireless communication devices such as portable telephone devices have become widespread. By the way, a mobile phone device generally includes a main antenna for both transmission and reception and a sub-antenna for reception only, and is configured to perform diversity reception by using the main antenna and the sub-antenna. In this case, the main antenna is configured by a whip antenna provided to protrude from the housing, and the sub-antenna is configured by a dielectric printed antenna, a flat plate antenna, or the like built in the housing.

[0003] In addition, the portable telephone device has a configuration in which a battery pack provided with a rechargeable battery (secondary battery) can be attached and detached in order to use the portable telephone device. The battery can be charged by mounting the battery pack on the mobile phone device, placing the mobile phone device on the charging device, and mechanically contacting the exposed contacts on the mobile phone device side with the exposed contacts on the charging device side. It has a configuration that can be used.

However, in the contact-type charging method in which the exposed contacts are brought into contact with each other and charged,
If the weight of the mobile phone device is not sufficient, sufficient contact pressure cannot be obtained and charging cannot be performed satisfactorily. Therefore, when the weight of the mobile phone device is not enough, it is conceivable to provide a lock mechanism in order to obtain a sufficient contact pressure. However, this makes installation and removal troublesome, and also reduces the number of parts. There has been a problem that the structure increases and the structure becomes complicated. Furthermore, in such a contact-type charging method, since the contact is exposed, if dust or dust adheres to the contact, the charging is adversely affected, or a conductor such as a clip straddles the contact. There is also a problem that if it falls, it short-circuits and breaks down.

[0005] To solve such a problem, there is a non-contact charging method. In this non-contact charging method, for example, a power transmitting coil wound around a power transmitting ferrite core is provided on the charging device side, and a power receiving coil wound around the power receiving ferrite core is provided on the mobile phone device side. The battery is charged by electromagnetic induction coupling between the power transmitting coil and the power receiving coil.

[0006] According to this non-contact charging method, even if the weight of the portable telephone device is not sufficient, it is possible to perform satisfactory charging simply by placing the portable telephone device on the charging device, and to expose the portable telephone device. Since there is no need to provide contacts,
The battery can be charged without being affected by dust, dust, and the like, and without the risk of short-circuiting, that is, after solving the various problems in the contact-type charging method described above.

However, in such a non-contact charging method, the power transmitting coil and the power receiving coil constituting the electromagnetic inductive coupling are large and heavy, so that a portable telephone device having a built-in power receiving coil cannot be used. In response,
There is a problem that the size increases and the weight increases. In particular, in view of the fact that the mobile phone device is required to be reduced in size and weight, such an increase in size and weight is an important problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a diversity receiving method using a main antenna and a sub antenna and charging a battery by a non-contact charging method. ,
An object of the present invention is to provide a wireless communication device that can be reduced in size and weight.

[0009]

According to the first aspect of the present invention, when the power receiving coil is electromagnetically inductively coupled to the power transmitting coil provided in the charging device and resonates at a charging frequency, the battery is charged. Become so. In addition, by providing an impedance element that forms a resonance circuit with the receiving coil, when the receiving coil resonates at a frequency for wireless communication,
The receiving coil acts as a sub-antenna.

[0010] That is, in this device, since the impedance element forming the resonance circuit with the power receiving coil is provided, the power receiving coil can be used both as a power receiving unit at the time of charging and as a reception-only sub-antenna for capturing radio waves. Therefore, the number of components can be reduced by the number of sub-antennas such as a dielectric printed antenna and a flat antenna required in the conventional configuration when receiving diversity. Therefore, as a wireless communication device,
The size and weight can be reduced, and the cost can be reduced.

In this case, since the charging frequency and the radio communication frequency are different from each other, even when the receiving coil resonates at the charging frequency, that is, even when the battery is being charged. Since the power receiving coil resonates at the frequency for wireless communication, wireless communication can be performed, and charging and wireless communication can be performed simultaneously.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment in which the present invention is applied to a portable telephone device will be described with reference to FIG.
This will be described with reference to FIGS. First, in FIG. 2, a call start key, a redial key, a call end key, numeric keys of “0” to “9”, an * (asterisk) key, A keypad 3 on which various keys such as a # (sharp) key and an F (function) key are arranged, a display 4 for displaying a telephone number of a communication partner, a microphone 5 for inputting a transmission signal, and outputting a reception signal Speaker 6 and an LED 7 that blinks when an incoming call is received.

An antenna case portion 2a is integrally provided on the upper side of the housing 2 so as to protrude upward. The antenna case portion 2a has a transmitting / receiving antenna for radiating and capturing radio waves. Main antenna 8 is provided. In this case, the main antenna 8 is specifically composed of a whip antenna.

Further, as shown in FIG. 3, a battery pack 9 including a battery (secondary battery) as a power supply is detachably provided on the rear surface side of the housing 2 and a power receiving unit. 10 is attached to the shield case 11 and disposed. As shown in FIG. 4, the power receiving unit 10 is configured such that a power receiving coil 12 is wound around an elliptical columnar projection 13 a in a power receiving ferrite core 13, and the longitudinal direction of the ferrite core 13 is a casing. It is disposed so as to be parallel to the longitudinal direction of the body 2 (vertical direction in FIG. 3). The number of turns and the height h of the power receiving coil 12 are respectively set to predetermined values so as to resonate at both the charging frequency and the wireless communication frequency, as described later in detail. I have.

As shown in FIG. 5, the portable telephone device 1 can be mounted on a charging stand 14 (a charging device according to the present invention). Inside the charging stand 14,
The power transmission unit 15 is mounted and disposed on a printed wiring board 16. In this case, the power transmission unit 15 has substantially the same configuration as the power reception unit 10, and the power transmission coil 17 is provided on the ferrite core 18 for power transmission. It is configured to be wound around an elliptic columnar projection. Then, the mobile phone 1 is connected to the charging stand 14.
In the state where the power receiving unit 10 is placed at the regular position, the power receiving unit 10 of the mobile phone device 1 and the power transmitting unit 15 of the charging stand 14 face each other, that is, the power receiving coil 12 and the power transmitting coil 17 face each other. Has become.

With such a configuration, the charging stand 14
When a commercial power (AC100V) is supplied from a commercial power supply to the power supply, a current flows through the power transmission coil 17 of the power transmission unit 15 to generate a magnetic flux from the power transmission coil 17, and the magnetic flux generated from the power transmission coil 17 is used as a ferrite for power transmission. It flows to the core 18. Then, the magnetic flux generated from the power transmission coil 17 is coupled to the power receiving unit 1 of the mobile phone device 1 by electromagnetic induction coupling.
By flowing through the ferrite core 13 for receiving power of 0, a current is induced in the power receiving coil 12, and the battery of the battery pack 9 is charged by the induced current.

Next, an electrical configuration of the portable telephone device 1 will be described with reference to FIG. The power receiving coil 12 of the power receiving unit 10 has a frequency of several tens kHz to several tens of kHz corresponding to the frequency of the charging current due to the action with the ferrite core 13 for power reception.
It is configured to resonate in the 0 kHz band. Also,
The power receiving coil 12 specifically forms a resonance circuit 20 with an impedance element 19 formed of a capacitor. By the action of the impedance element 19, the power receiving coil 12 resonates even in an 800 MHz band corresponding to the frequency of a high-frequency wireless communication current. It is configured.

The common connection point between the power receiving coil 12 and the impedance element 19 in the resonance circuit 20 is connected to the input terminal of the charging frequency discriminating circuit 21 and the input terminal of the wireless communication frequency discriminating circuit 22. An output terminal of the frequency discriminating circuit 21 is connected to an input terminal of the rectifying / smoothing circuit 23.

The charging frequency discriminating circuit 21 includes a resonance circuit 2
When a signal is given from 0, several tens kHz to several hundreds kHz corresponding to the frequency of the charging current are obtained from the given signal.
Discriminates signals in the z band, from several tens of kHz to several hundreds of kHz
The band signal is output to the rectifying / smoothing circuit 23. The rectifying and smoothing circuit 23 includes a charging frequency discriminating circuit 21.
When a signal in a band of several tens of kHz to several hundreds of kHz is given, the given signal is rectified and output. Thereby, several tens kHz to several hundred kHz
A signal in the z band is provided to the charge control circuit.

When a signal is supplied from the resonance circuit 20, the radio communication frequency discrimination circuit 22 converts the applied signal to 800 MHz corresponding to the frequency of a high-frequency radio communication current.
The signal in the z band is discriminated, and the signal in the 800 MHz band is output. Thus, an 800 MHz band signal is supplied to the high frequency receiving circuit.

Next, the operation of the above configuration will be described. First, when the mobile phone device 1 is placed on the charging stand 14 and the charging stand 14 is connected to a commercial power supply, the commercial power is supplied to the charging stand 14, and the electric current is supplied to the power transmitting coil 17 of the power transmitting unit 15 as described above. By flowing
Magnetic flux is generated from the power transmission coil 17, and the magnetic flux generated from the power transmission coil 17 flows to the ferrite core 18 for power transmission. Then, the magnetic flux generated from the power transmission coil 17 also flows through the ferrite core 13 for power reception of the power reception unit 10 of the mobile phone device 1 by electromagnetic induction coupling, and a current is induced in the power reception coil 12.

When the current induced in the power receiving coil 12 is supplied to the charging frequency discriminating circuit 21, the frequency is discriminated to output a signal in a frequency band of several tens kHz to several hundreds kHz corresponding to the frequency of the charging current. Then, when the signal is given to the rectifying and smoothing circuit 23, it is rectified and output to the charge control circuit, and the battery of the battery pack 9 is charged via the charge control circuit. As described above, since the power receiving coil 12 functions as a power receiving unit during charging,
The battery of the battery pack 9 can be charged.

The power receiving coil 12 forms an impedance element 19 composed of a capacitor and a resonance circuit 20 as described above, and acts with the impedance element 19 to generate an 800M signal corresponding to the frequency of a high-frequency wireless communication current.
Since the mobile phone device 1 is configured to resonate in the Hz band, when the mobile phone device 1 is waiting for outgoing / incoming calls,
It can capture radio waves in the MHz band.

That is, when an electric wave in the 800 MHz band is captured by the power receiving coil 12 and the current induced in the power receiving coil 12 is given to the radio communication frequency discriminating circuit 22, the frequency is discriminated and the high frequency radio communication is performed. An 800 MHz band signal corresponding to the current is output to the high frequency receiving circuit. As described above, since the receiving coil 12 functions as a receiving-only sub-antenna for capturing radio waves, 800
A radio wave in the MHz band can be captured. Since the power receiving coil 12 acts as a sub-antenna in this way, diversity reception can be performed by the power transmitting / receiving main antenna 8 and the power receiving coil 12 capable of emitting and capturing radio waves.

In the above description, the frequency for wireless communication at which the receiving coil 12 resonates has been described as an 800 MHz band. The frequency for wireless communication is determined by combining the impedance element 19 with a capacitor and a resistor. By changing the configuration or the like, or by adjusting the capacitance of the capacitor, the resistance value of the resistor, the number of turns of the power receiving coil 12, and the height dimension h, a 1.5 GHz band can be freely set.

As described above, according to the first embodiment, the impedance element 19 is connected to the power receiving coil 12 acting as a power receiving unit during charging, so that the power receiving coil 12 resonates in the 800 MHz band for high-frequency wireless communication. Resonance circuit 20
Is formed so that the power receiving coil 12 also serves as a power receiving unit and a reception-only sub-antenna for capturing radio waves during charging, so that the dielectric printed antenna required in the conventional configuration for diversity reception is required. The number of components can be reduced by the number of sub-antennas such as antennas and flat antennas. Therefore, the size and weight of the mobile phone device 1 can be reduced accordingly.
Further, cost can be reduced.

Also, in this case, the frequency band for charging and the frequency band for wireless communication are greatly different, so when the power receiving coil 12 resonates in the charging frequency band, that is, when the battery of the battery pack 9 Even during charging, wireless communication can be performed by the power receiving coil 12 resonating in the frequency band for wireless communication, and charging and wireless communication can be performed simultaneously.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
An embodiment will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, different parts will be described. In the above-described first embodiment, the power receiving unit 10 is disposed such that the longitudinal direction of the ferrite core 13 for receiving power is parallel to the longitudinal direction of the housing 2. In the power receiving unit 10, the power receiving ferrite core 13 is disposed such that the longitudinal direction of the ferrite core 13 is perpendicular to the longitudinal direction of the housing 2 (the vertical direction in FIG. 6).

As described above, according to the second embodiment, the power receiving unit 1
Since only the arrangement form of 0 is different, there is no difference in the other configuration from the above-described first embodiment, so that the same operation and effect as the above-described first embodiment can be obtained.

(Other Embodiments) The present invention is not limited to the above embodiment, but can be modified or expanded as follows. As a wireless communication device,
Not limited to the mobile phone device, any other configuration can be used as long as the configuration is such that diversity reception is performed by the main antenna for both transmission and reception and the sub-antenna dedicated to reception, and the configuration adopts a non-contact charging method by electromagnetic induction coupling. It may be. The power receiving unit may be provided on the battery pack side instead of the housing side of the mobile phone device. In that case, a circuit for controlling charging may be provided on the battery pack side.

[Brief description of the drawings]

FIG. 1 is a diagram showing an electrical configuration showing a first embodiment of the present invention.

FIG. 2 is a perspective view seen from the front.

FIG. 3 is a perspective view seen from the back side.

FIG. 4 is a perspective view of a power receiving unit.

FIG. 5 is a side view showing a state of being placed on a charging stand in a partial cross section.

FIG. 6 is a view corresponding to FIG. 3, showing a second embodiment of the present invention.

[Explanation of symbols]

In the drawings, 1 is a mobile phone device (wireless communication device), 8 is a main antenna, 9 is a battery, 12 is a receiving coil and a sub-antenna, 14 is a charging stand (charging device), 17 is a transmitting coil, 19 is an impedance element, 20 is a resonance circuit.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 7/04 H04B 7/04 F term (Reference) 5G003 AA01 BA01 DA04 FA08 GB01 GB08 5J046 AA07 AB06 AB10 SA00 TA03 5K011 AA06 AA08 DA02 DA29 JA01 KA01 5K059 CC03 DD02 EE03 5K062 AA01 AB11 AC01 BB06 BD00

Claims (1)

[Claims] A power receiving coil that resonates at a charging frequency, and a battery that is charged by the power receiving coil being electromagnetically inductively coupled to a power transmitting coil provided in a charging device and resonating at the charging frequency. In a wireless communication device comprising: a transmitting / receiving main antenna and a receiving-only sub-antenna configured to perform diversity reception, the receiving coil resonates at a wireless communication frequency different from the charging frequency. A wireless communication device, comprising: an impedance element that forms a resonance circuit with the power receiving coil; wherein the power receiving coil functions as the sub-antenna by resonating at the frequency for wireless communication.