JP6356473B2 - Wireless device and display control method in wireless device - Google Patents

Description

  The present invention relates to a radio apparatus and a display control method in the radio apparatus.

  As described in Patent Document 1, various techniques have been proposed for a communication terminal including a coil. In patent document 1, a battery (battery) is charged using the induced electromotive force generated in the first coil. The induced electromotive force of the first coil is generated when the magnetic flux from the second coil provided in the external charger is linked to the first coil.

JP 2008-131812 A

  In Patent Document 1, charging is performed by placing a wireless device on a charger. However, Patent Document 1 does not describe displaying information related to the charging to the user. Therefore, even if the situation of charging changes, the user cannot know the situation change. Therefore, there was still room for improvement in usability.

  SUMMARY An advantage of some aspects of the invention is that it provides a display control technique for a wireless device capable of improving usability.

In order to solve the above-described problem, one aspect of a wireless device according to the present invention is a wireless device capable of communicating with a wireless device of a communication partner, and is induced by a magnetic flux from an external charger side coil interlinking. A charging coil that generates power; a battery that is charged with a charging current supplied by the induced electromotive force; a wireless communication unit that performs wireless communication with the wireless device of the other party; a display device; and the wireless communication A communication processing unit that communicates with the wireless terminal of the communication partner via the communication unit and performs processing related to the call, and reduces the charging current during the call when performing a call while charging using the induced electromotive force. A display control unit that displays the charging information on the display device, and a charge amount detection unit that detects the amount of charge stored in the battery, and the display control unit has a negative rate of change with respect to time of the charge amount. When Displaying the charging information on the display device.
Further, one aspect of the wireless device according to the present invention is a wireless device capable of communicating with a wireless device of a call partner, and charging that generates an induced electromotive force by interlinking magnetic flux from an external charger side coil. Coil, a battery charged with charging current supplied by the induced electromotive force, a wireless communication unit that performs wireless communication with the wireless device of the other party, a display device, and the wireless communication unit through the wireless communication unit A call processing unit that communicates with a wireless terminal of a call partner and performs processing related to a call, and when performing a call while performing charging using the induced electromotive force, charging information related to reduction of the charging current during the call A display control unit for displaying on a display device, a reception level measurement unit for measuring a reception level of a reception signal received by the wireless communication unit, and a reception sensitivity when the reception level is smaller than a reference value, Les A current adjustment unit that adjusts the charging current so that the reception sensitivity when the signal is larger than the reference value is improved, and the wireless communication unit includes both the first frequency band and the second frequency band. The current adjustment unit adjusts the charging current with a value other than zero when the reception level is smaller than the reference value in the first frequency band, and in the second frequency band, When the reception level is smaller than the reference value, the charging current is set to zero, and in the first frequency band, the transmission band and the reception band are 1851.25 to 1908.75 [MHz] and 1931.25-1988.75 [MHz], respectively. In the second frequency band, the transmission band and the reception band are 824.7 to 848.31 [MHz] and 869.7 to 893.31 [MHz], or 817.9 to 823.1 [MHz] and 862.9 to 868.1 [MHz], respectively, and the display control Part The charging information is displayed on the display device in a call using the second frequency band without displaying the charging information in a call using one frequency band.
Further, one aspect of the wireless device according to the present invention is a wireless device capable of communicating with a wireless device of a call partner, and charging that generates an induced electromotive force by interlinking magnetic flux from an external charger side coil. Coil, a battery charged with charging current supplied by the induced electromotive force, a wireless communication unit that performs wireless communication with the wireless device of the other party, a display device, and the wireless communication unit through the wireless communication unit A call processing unit that communicates with a wireless terminal of a call partner and performs processing related to a call, and when performing a call while performing charging using the induced electromotive force, charging information related to reduction of the charging current during the call A transmission level for determining the transmission level so as not to exceed the maximum value while increasing the transmission level of the transmission signal transmitted from the display control unit displayed on the display device and the wireless communication unit according to an external request. A determination unit and a maximum value setting for setting the maximum value when charging using the induced electromotive force is performed smaller than the maximum value when charging using the induced electromotive force is not performed A part.

  In one aspect of the wireless device according to the present invention, a charging connector to which an external contact charger is detachably connected, one of the voltage of the charging connector and the induced electromotive force is selected, and the one is selected. And a selection unit that charges the battery, and the display control unit recommends charging using the contact charger when performing a call while performing charging using the induced electromotive force. Is displayed on the display device.

  An aspect of the wireless device according to the present invention includes: a reception level measurement unit that measures a reception level of a reception signal received by the wireless communication unit; and a reception sensitivity when the reception level is smaller than a reference value. And a current adjustment unit for adjusting the charging current so as to improve the reception sensitivity when the reception level is larger than the reference value.

  In one aspect of the wireless device according to the present invention, when the reception level is smaller than the reference value, the current adjustment unit sets the charging current to zero.

  In one aspect of the wireless device according to the present invention, the charging information is information indicating that the charging current may be reduced.

  In one aspect of the wireless device according to the present invention, the charging information is information indicating that the charging may be interrupted.

  In one aspect of the wireless device according to the present invention, the display control unit displays the charging information on the display device when the reception level is lower than the reference value.

  In one aspect of the wireless device according to the present invention, the charging information is information indicating that the charging current is being reduced.

Also, one aspect of the display control method in the wireless device according to the present invention is a charging coil that generates an induced electromotive force by interlinking magnetic flux from an external charger side coil, and a charging current by the induced electromotive force. A wireless device comprising: a battery that is supplied and charged; a wireless communication unit; a display device; and a call processing unit that communicates with the other party's wireless terminal via the wireless communication unit and performs processing related to the call In the method of controlling the display of the display device, when performing a call while charging using the induced electromotive force, charging information relating to the reduction of the charging current during the call is displayed on the display device. The transmission level of the transmission signal transmitted from the wireless communication unit is increased in response to an external request, the transmission level is determined so as not to exceed the maximum value, and charging using the induced electromotive force is performed. The maximum value, the set smaller than the maximum value when the charge using the induced electromotive force is not performed when is being performed.

  According to the present invention, usability can be improved.

It is a figure which shows an example of a notional structure of a radio | wireless communications system. It is a flowchart which shows an example of operation | movement of a base station. It is a block diagram which shows an example of an electric structure of a radio | wireless apparatus roughly. It is a figure for demonstrating non-contact charge. It is sectional drawing which shows an example of a radio | wireless apparatus and a non-contact charger roughly. It is a block diagram which shows roughly an example of an internal structure of a charging part and a charge detection part. It is a figure which shows an example of a notional structure of the control part of a radio | wireless apparatus. It is a flowchart which shows an example of operation | movement of a transmission level determination part. It is a flowchart which shows an example of operation | movement of the maximum value setting part. It is a figure which shows typically an example of the relationship between reception sensitivity and a transmission level, and an example of the relationship between a reception level and a transmission level. It is a figure which shows an example of a time chart. It is a flowchart which shows an example of operation | movement of a control part. It is a block diagram which shows roughly an example of an internal structure of a charging part and a charge detection part. It is a figure which shows typically the relationship between charging current and receiving sensitivity. It is a flowchart which shows an example of operation | movement of a current control part. It is a figure which shows an example of a time chart. It is a flowchart which shows an example of operation | movement of a control part. It is a figure which shows typically the relationship between charging current and receiving sensitivity. It is a flowchart which shows an example of operation | movement of a display control part. It is a figure which shows notionally an example of a charge notification screen. It is a flowchart which shows an example of operation | movement of a display control part. It is a flowchart which shows an example of operation | movement of a display control part. It is a figure which shows control of transmission level, and control of charging current.

First embodiment.
<Overall configuration>
FIG. 1 shows an example of a conceptual configuration of a wireless communication system. The wireless communication system includes a base station 2 as an example of an external device and a wireless device (for example, a portable wireless terminal) 1. The portable wireless terminal 1 is operated by a user. The portable wireless terminal 1 can perform wireless communication with the base station 2. The portable radio terminal 1 transmits the transmission signal Tx1 to the base station 2, and the base station 2 receives this as the reception signal Rx2. The base station 2 transmits the transmission signal Tx2 to the portable radio terminal 1, and the portable radio terminal 1 receives this as the reception signal Rx1.

  The mobile wireless terminal 1 is, for example, a mobile phone such as a smartphone, or a mobile information terminal such as a PDA (Personal Data Assistance) or a tablet terminal. The base station 2 relays communication between the mobile wireless terminal 1 and a higher-level network (such as a telephone network or the Internet network) or another base station. Thereby, the base station 2 can also relay communication between different portable wireless terminals 1.

<Base station>
The base station 2 includes a wireless communication unit 210 and a control unit 21. The wireless communication unit 210 includes an antenna 211. The wireless communication unit 210 transmits the transmission signal Tx2 to the portable wireless terminal 1 via the antenna 211, and receives the reception signal Rx2 from the portable wireless terminal 1 via the antenna 211.

  The control unit 21 controls the entire base station 2. The control unit 21 includes an arithmetic processing device such as a CPU and a storage unit such as a memory. A program for controlling the base station 2 is stored in the storage unit, and the base station 2 is controlled by the arithmetic processing unit executing the program.

  For example, the control unit 21 generates the transmission signal Tx2, and transmits the transmission signal Tx2 to the portable wireless terminal 1 via the wireless communication unit 210 and the antenna 211. The control unit 21 analyzes the reception signal Rx2 received via the antenna 211 and the wireless communication unit 210, and executes control according to the contents.

  As shown in FIG. 1, the control unit 21 includes a reception level measurement unit 22, a reception level determination unit 23, and a transmission level increase request unit 24. Note that these functions may be formed by executing a program of the control unit 21, or a part or all of these functions may be formed by hardware.

  FIG. 2 is a diagram illustrating an example of the operation of the control unit 21. In step S1, the reception level measurement unit 22 receives the reception signal Rx2, and measures the reception level (power value). Next, in step S2, the reception level determination unit 23 determines whether or not the reception level is greater than a reference value. This determination can be performed using a known comparator. As this reference value, a reception level value (reception sensitivity) necessary for analyzing the reception signal Rx2 is employed. Therefore, when the reception level is smaller than the reference value, it is difficult to perform an appropriate analysis.

  Therefore, when it is determined in step S2 that the reception level is smaller than the reference value, in step S3, the transmission level increase request unit 24 requests the portable wireless terminal 1 to increase the transmission level of the transmission signal Tx1. More specifically, a request signal for requesting an increase in transmission level is included in the transmission signal Tx2, and then transmitted to the portable wireless terminal 1 via the antenna 211 and the wireless communication unit 210. This request signal may include an increase in transmission level.

  In the following description, including a predetermined signal in the transmission signal Tx2 and transmitting the transmission signal Tx2 via the antenna 211 and the wireless communication unit 210 is also expressed as simply transmitting a signal. Similarly, receiving a predetermined signal included in the received signal Rx2 via the antenna 211 and the wireless communication unit 210 is also expressed as simply receiving a signal. The same applies to the portable wireless terminal 1.

  When the portable radio terminal 1 receives this request signal, the transmission level (power value) of the transmission signal Tx1 is increased according to the request signal. When the request signal includes an increase amount, the transmission level is increased by the increase amount. Since the transmission signal Tx1 is transmitted at a higher transmission level, the reception level of the reception signal Rx2 received by the base station 2 also increases. Therefore, the reception signal Rx2 can be received at an appropriate reception level.

  On the other hand, when the reception level is higher than the reference value in step S2, the process ends without performing step S3. That is, when the reception level is already sufficient, the request signal is not transmitted. Where the power consumption increases due to the transmission of the transmission signal Tx1 at a high transmission level, the increase in power consumption in the portable wireless terminal 1 is avoided.

<Mobile wireless terminal>
FIG. 3 is a block diagram schematically showing an example of the electrical configuration of the portable wireless terminal 1. As shown in FIG. 3, the mobile wireless terminal 1 includes a control unit 10, a wireless communication unit 110, a display device 20, a touch panel 30, an LED display unit 40, an operation key 50, a battery 60, a charge detection unit 70, and a charge amount. A detection unit 78, a charging unit 80, a microphone 150, a front side imaging unit 160, a back side imaging unit 170, a speaker 180, a piezoelectric vibration element 190, and a proximity wireless communication unit 90 are provided. These components provided in the portable wireless terminal 1 are housed in the casing of the portable wireless terminal 1.

  The control unit 10 includes a CPU (Central Processing Unit) 101, a DSP (Digital Signal Processor) 102, a storage unit 103, and the like. The control unit 10 comprehensively manages the operation of the portable wireless terminal 1 by controlling other components of the portable wireless terminal 1. The storage unit 103 includes a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The storage unit 103 is a main program that is a control program for controlling the mobile wireless terminal 1, specifically, for controlling each component such as the wireless communication unit 110 and the display device 20 included in the mobile wireless terminal 1. In addition, a plurality of application programs (for example, programs such as telephone calls, e-mails, and the Internet) are stored. Various functions of the control unit 10 are realized by the CPU 101 and the DSP 102 executing various programs in the storage unit 103.

  The wireless communication unit 110 has an antenna 111. The wireless communication unit 110 transmits and receives communication signals to / from a mobile wireless terminal different from the mobile wireless terminal 1 or a communication device such as a web base station connected to the Internet using the antenna 111 via the base station 2. .

  The close proximity wireless transfer unit 90 has an antenna 91. The close proximity wireless communication unit 90 performs communication with a communication terminal that is located closer to the communication target (base station 2) of the wireless communication unit 110. The close proximity wireless transfer unit 90 performs communication in accordance with, for example, the BLUETOOTH (registered trademark) standard.

  As a method of using this close proximity wireless communication, for example, a method of making a call using the headset 4 (FIG. 1) can be cited. The portable wireless terminal 1 communicates with the headset 4 via the proximity wireless communication unit 90 and the antenna 91.

  The headset 4 includes an earphone, a microphone, an operation unit, and a proximity wireless communication unit, and can be worn by a user. The portable wireless terminal 1 receives the audio signal from the portable wireless terminal 1 that is the call partner via the base station 2 and transmits it to the headset 4. The headset 4 converts this audio signal into sound with an earphone and outputs it. The voice uttered by the user is converted into a voice signal by the microphone of the headset 4 and transmitted to the portable wireless terminal 1. The mobile radio terminal 1 transmits this audio signal to the mobile radio terminal of the other party via the base station 2. When the user inputs a response or end of a call via the operation unit of the headset 4, these pieces of information are transmitted to the portable wireless terminal 1. In this way, the user can make a call using the headset 4. Further, since the headset 4 is worn by the user, it is not necessary to hold the portable wireless terminal 1 and the headset 4 and both hands can be freely set.

  The display device 20 is, for example, a liquid crystal display or an organic EL display. Various types of information displayed by the display device 20 are visually recognized from the outside through the display area of the mobile wireless terminal 1.

  The touch panel 30 is, for example, a projected capacitive touch panel, and is disposed to face the display device 20. The touch panel 30 includes two sheet-like electrode sensors arranged to face each other. When the user touches the display area with an operator such as a finger, the capacitance of the portion of the touch panel 30 facing the operator changes. Then, the touch panel 30 outputs an electrical signal corresponding to the change in capacitance to the control unit 10. As described above, the touch panel 30 can detect contact of the operation element with the display area.

  When pressed, the operation key 50 outputs an electrical instruction signal to the control unit 10. Both the operation key 50 and the touch panel 30 are common in that they accept operations on the portable wireless terminal 1.

  The speaker 180 converts the electrical sound signal input from the control unit 10 into a sound and outputs the sound, thereby providing a ringtone or the like to a user who is located away from the portable wireless terminal 1.

  The microphone 150 and the piezoelectric vibration element 190 are used for a call, for example. This call is a call having a mode different from the call using the headset 4 described above. Here, the user makes a call with the microphone 150 close to the mouth and the piezoelectric vibration element 190 close to the ear. The microphone 150 receives a user's voice or the like during a call or the like, converts the input voice or the like into an electrical signal, and outputs the electrical signal to the control unit 10.

  The piezoelectric vibration element 190 is vibrated by a drive voltage supplied from the control unit 10. The control unit 10 generates a drive voltage based on the sound signal and applies the drive voltage to the piezoelectric vibration element 190. When the piezoelectric vibration element 190 is vibrated based on the sound signal by the control unit 10, the portable wireless terminal 1 (more specifically, the surface on which the user's ear is close) vibrates based on the sound signal. As a result, the received sound is transmitted to the user. The volume of the received sound is such that the user can hear it properly when the user brings his ear close to the mobile wireless terminal 1.

  In the example of FIG. 3, the piezoelectric vibration element 190 is employed to transmit the received sound to the user. However, instead of the piezoelectric vibration element 190, for example, an electrical sound signal from the control unit 10 is sounded. A dynamic speaker that converts the sound into an output and outputs the sound may be used. When employing a dynamic speaker, the portable wireless terminal 1 is provided with a receiver hole. The sound output from the dynamic speaker is output to the outside through the receiver hole. The volume of the sound output from the receiver hole is smaller than the volume of the sound output from the speaker 180.

  The LED display unit 40 includes a light emitting element (for example, LED: light emitting diode), and the light emission is controlled by the control unit 10. The LED display unit 40 emits light to notify the user when, for example, a battery 60 described later is being charged, or when there is an unanswered incoming call or unread e-mail.

  The front side imaging unit 160 and the back side imaging unit 170 capture still images and moving images. The back side imaging unit 170 is provided on the back side of the portable wireless terminal 1.

  The battery 60 is a so-called battery and functions as an operating power source for the portable wireless terminal 1. The battery 60 supplies direct current power to each part (each part illustrated in FIG. 3) that requires power in the portable wireless terminal 1.

  The charge amount detection unit 78 detects the amount of charge accumulated in the battery 60 and outputs this to the control unit 10. For example, the control unit 10 displays the charge amount (remaining battery amount) of the battery 60 on the display device 20.

  The charging unit 80 receives electric power from an external charger and uses this to charge the battery 60. More specifically, the charging unit 80 includes a non-contact charging unit 82 and a charging connector (connecting unit) 84. As will be described later, the non-contact charging unit 82 and the charging connector 84 can receive electric power from the non-contact charger and the contact charger, respectively, and charge the battery 60, respectively. The control unit 10 selects one of the non-contact charging unit 82 and the charging connector 84, and the selected one charges the battery 60.

  The charge detection unit 70 detects whether the charging unit 80 is receiving power from the charger. More specifically, it detects whether or not the non-contact charging unit 82 receives power from the non-contact charger, and whether or not the charging connector 84 receives power from the contact charger. The detection result is input to the control unit 10.

  The control unit 10 selects one of the non-contact charging unit 82 and the charging connector 84 according to the detection result of the charging detection unit 70 and charges the battery 60 using this.

<Charging>
Hereinafter, the charging of the battery 60 by the non-contact charging unit 82 will be described with reference to FIGS. 4 and 5, and a specific example of the internal configuration of the charging unit 80 and the charging detection unit 70 will be described with reference to FIG. 6. .

  In FIG. 4, an example of the portable wireless terminal 1 and the non-contact charger 8 is shown in a perspective view. The portable wireless terminal 1 has a flat plate shape, for example. A display area 2a is formed on the front surface.

  The non-contact charging unit 82 includes a charging coil 82a. The charging coil 82a has a conducting wire wound around a predetermined winding axis, and the winding axis is arranged in a posture substantially orthogonal to the display region 2a.

  The non-contact charger 8 has, for example, a substantially flat shape and includes a charger side coil 8a. The charger side coil 8 a has a conducting wire wound around a predetermined winding axis, and the winding axis is arranged in a posture substantially orthogonal to the main surface of the non-contact charger 8. The non-contact charger 8 is connected to a power source (not shown), and a current (for example, an alternating current) can flow through the charger side coil 8a using the power source. Thereby, the charger side coil 8a generates a magnetic field (for example, an alternating magnetic field).

  The user places the portable wireless terminal 1 on the main surface of the non-contact charger 8 so that the charging coil 82a faces the charger-side coil 8a. FIG. 5 conceptually shows an example of these cross sections when the portable wireless terminal 1 is placed on the main surface of the non-contact charger 8. In this state, the magnetic flux generated from the charger side coil 8a is linked to the charging coil 82a. Thereby, an induced electromotive force is generated in the charging coil 82a. That is, the charging coil 82a generates an induced electromotive force when receiving the magnetic field from the charger side coil 8a. This induced electromotive force is an alternating voltage. As will be described later, the non-contact charging unit 82 rectifies the induced electromotive force and charges the battery 60.

  As described above, the non-contact charging unit 82 receives power by magnetic connection with the non-contact charger 8 and charges the battery 60. That is, this charging does not require an electrical connection between the portable wireless terminal 1 and the non-contact charger 8. Therefore, such a charging method is called non-contact charging or wireless charging. Alternatively, since charging is performed using electromagnetic induction, this charging method is also called electromagnetic induction charging.

  In order to improve the efficiency (transmission efficiency) of power received by the charging coil 82a from the charger side coil 8a, the non-contact charging unit 82 may include a magnetic sheet (not shown). The transmission efficiency here is the ratio of the power of the charging coil 82a to the power of the charger side coil 8a. The magnetic sheet is formed of a material having a higher magnetic permeability than air. The charging coil 82a is provided on one surface of the magnetic sheet such that the winding axis thereof is substantially orthogonal to the magnetic sheet. Since the magnetic sheet has a high magnetic permeability, the amount of magnetic flux can be increased. As a result, the induced electromotive force of the charging coil 82a can be increased. In other words, it is possible to reduce the electric power of the charger side coil 8a required for generating a necessary voltage in the charging coil 82a. By providing the magnetic sheet, leakage of the magnetic flux passing through the charging coil 82a to the outside can be suppressed.

  In the illustration of FIG. 5, the portable wireless terminal 1 is placed on the contactless charger 8 with the back surface 3 b of the portable wireless terminal 1 facing the contactless charger 8. Therefore, in the illustration of FIG. 4, the charging coil 82 a is affixed to a portion on the back surface 3 b side of the housing 3 of the mobile wireless terminal 1. Thereby, the charging coil 82a can be brought close to the charger side coil 8a. Thus, by shortening the distance between the charging coil 82a and the charger side coil 8a, the amount of magnetic flux effectively linked to the charging coil 82a can be improved. Therefore, the magnitude of the induced electromotive force of the charging coil 82a can be improved, and consequently the transmission efficiency can be improved.

  Further, in the plan view, if the center Q1 of the charging coil 82a and the center Q2 of the charger side coil 8a are deviated, the magnetic flux effectively interlinked with the charging coil 82a according to the deviation amount (distance). The amount is reduced. That is, the longer the distance, the more the induced electromotive force generated in the charging coil 82a. Thereby, the transmission efficiency is reduced. Therefore, it is desirable for the user to place the portable wireless terminal 1 so that the distance between the center Q1 of the charging coil 82a and the center Q2 of the charger side coil 8a is shortened in plan view.

  In the illustration of FIG. 4, the charging connector 84 is also illustrated. The charging connector 84 is provided on, for example, a side surface of the mobile wireless terminal 1. A contact charger (not shown) is electrically connected to the charging connector 84, and a DC voltage is applied from the contact charger. The contact charger has an AC-DC adapter. The AC-DC adapter receives an AC voltage from the outside, converts it into an appropriate DC voltage, and applies the DC voltage to the charging connector 84.

  FIG. 6 is a block diagram illustrating an example of a specific internal configuration of the charging unit 80 and the charging detection unit 70. The charging unit 80 includes, for example, a charging connector 84, a non-contact charging unit 82, a selection unit 86, and a current adjustment unit 88. The non-contact charging unit 82 includes a charging coil 82a, a rectifying unit 82b, and a voltage adjusting unit 82c. As described above, the charging coil 82a receives the magnetic field from the non-contact charger 8 and generates an induced electromotive force. The induced electromotive force (alternating voltage) from the charging coil 82a is input to the rectifying unit 82b. The rectifying unit 82b rectifies the induced electromotive force, and inputs the rectified DC voltage to the voltage adjusting unit 82c. The voltage adjustment unit 82c is a constant voltage circuit, for example, and outputs a stable DC voltage.

  Under the control of the control unit 10, the selection unit 86 selects one of the voltage from the charging connector 84 and the induced electromotive force from the charging coil 82a, and charges the battery 60 using the one. For example, the selection unit 86 is a switch, and selects one of the voltage of the charging connector 84 and the output voltage of the non-contact charging unit 82, and inputs one of them to the current adjustment unit 88.

  The output of the current adjustment unit 88 is connected to the battery 60. The current adjusting unit 88 adjusts and outputs the output current.

  The charge detection unit 70 includes voltage detection units 72 and 74, for example. The voltage detection unit 72 detects the output voltage of the non-contact charging unit 82 and outputs the detection result to the control unit 10. The voltage detection unit 74 detects the voltage of the charging connector 84 and outputs the detection result to the control unit 10. When the output voltage of the non-contact charging unit 82 is larger than the voltage reference value, it can be determined that the non-contact charging unit 82 is receiving power from the non-contact charger 8, and similarly, the voltage of the charging connector 84 is the voltage reference. When larger than the value, it can be determined that the charging connector 84 is receiving power from the contact charger.

  The control unit 10 includes a determination unit 14 and a switch control unit 15. The determination unit 14 and the switch control unit 15 may be formed by executing a program by the control unit 10, or a part or all of them may be formed by hardware. The same applies to various functions described later that are provided in the control unit 10, so that repeated description is avoided in the following.

  The determination unit 14 determines whether the output voltages of the non-contact charging unit 82 and the charging connector 84 are each greater than a voltage reference value. The switch control unit 15 controls the selection unit 86 according to the determination result. Specifically, when the voltage of the charging connector 84 is larger than the voltage reference value and the output voltage of the non-contact charging unit 82 is smaller than the voltage reference value, the control unit 10 controls the selection unit 86, The voltage of the charging connector 84 is input to the current adjusting unit 88. That is, in this case, the non-contact charger 8 is not used, and the voltage from the contact charger is input to the charging connector 84, so the battery 60 is charged using the voltage of the charging connector 84. It is.

  On the other hand, when the voltage of the charging connector 84 is smaller than the voltage reference value and the output voltage of the non-contact charging unit 82 is larger than the voltage reference value, the control unit 10 controls the selection unit 86 to perform non-contact. The output voltage of the charging unit 82 is input to the current adjusting unit 88. That is, in this case, since the contact charger is not used and the portable wireless terminal 1 is placed on the non-contact charger 8, the battery 60 is mounted using the induced electromotive force of the charging coil 82a. Charge it.

  When both the voltage of the charging connector 84 and the output voltage of the non-contact charging unit 82 are larger than the voltage reference value, the control unit 10 controls the selection unit 86 to use, for example, the voltage of the charging connector 84. The battery 60 is charged. That is, when both the contact charger and the non-contact charger 8 are used, for example, the contact charger is preferentially adopted.

  The non-contact charging unit 82 can perform close proximity wireless communication with the non-contact charger 8. Through this communication, the non-contact charger 8 can recognize that the portable wireless terminal 1 has been placed and that the portable wireless terminal 1 has left. Further, when the portable wireless terminal 1 is placed on the non-contact charger 8 and the contact charger is connected to the charging connector 84, the non-contact charging unit 82 is used to end the non-contact charging. A signal may be transmitted to the non-contact charger 8. The non-contact charger 8 that has received this terminates the application of the AC voltage to the charger-side coil 8a. Thereby, unnecessary power consumption in the non-contact charger 8 can be avoided.

<Communication with base station>
The control unit 10 generates a transmission signal Tx1 and transmits the transmission signal Tx1 to the base station 2 via the wireless communication unit 110 and the antenna 111. Further, the control unit 10 receives the received signal Rx1 via the antenna 111 and the wireless communication unit 110 and analyzes it. The control unit 10 controls the portable wireless terminal 1 according to the content of the reception signal Rx1.

  As illustrated in FIG. 7, the control unit 10 includes a determination unit 14, a reception level measurement unit 11, a transmission level determination unit 12, a maximum value setting unit 13, and a reception confirmation processing unit 17. The determination unit 14 is as described above.

  The reception level measurement unit 11 receives the reception signal Rx1 and measures the reception level. The transmission level determination unit 12 determines an initial value of the transmission level of the transmission signal Tx1 based on the reception level of the reception signal Rx1. More specifically, the smaller the reception level of the reception signal Rx1, the larger the initial value of the transmission level of the transmission signal Tx1 is determined. This is due to the following reasons.

  That is, the low reception level of the reception signal Rx1 means that a large amount of power has been lost before the transmission signal Tx2 transmitted from the base station 2 reaches the portable radio terminal 1. Therefore, in this communication state, in order for the mobile radio terminal 1 to properly transmit the transmission signal Tx1 to the base station 2, it is necessary to transmit at a higher transmission level. Therefore, the transmission level determination unit 12 determines the initial value of the transmission level of the transmission signal Tx1 to be larger as the reception level of the reception signal Rx1 is smaller.

  Conversely, when the reception level of the reception signal Rx1 is high, the transmission signal Tx1 can be appropriately delivered to the base station 2 even if the transmission level is low. Therefore, by determining the initial value of the transmission level to be smaller as the reception level is higher, transmission of the transmission signal Tx1 at an unnecessary transmission level can be avoided, and the power consumption of the portable wireless terminal 1 is reduced.

  Table 1 shows an example of a correspondence relationship between the reception level of the reception signal Rx1 and the initial value of the transmission level of the transmission signal Tx1. In Table 1, the larger the reception level, the smaller the initial value of the transmission level.

  This table may be stored in advance in a storage unit (for example, the storage unit 103). The transmission level determination unit 12 determines an initial value of the transmission level based on the table stored in the storage unit and the reception level measured by the reception level measurement unit 11. In this table, in an area where the reception level value does not exist, an initial value of the transmission level may be determined by appropriately performing an interpolation process.

  On the other hand, as described above, a request signal (signal requesting an increase in transmission level) PR1 may be transmitted from the base station 2. The transmission level determination unit 12 increases the transmission level according to the request signal PR1. FIG. 8 is a flowchart showing an example of a transmission level determination operation according to the request signal PR1 from the base station 2.

  As shown in FIG. 8, first, in step S10, the control unit 10 determines whether or not the request signal PR1 has been received. If it is determined that the request signal PR1 has not been received, step S10 is executed again. When it is determined in step S10 that the request signal PR1 is included, in step S11, the transmission level determination unit 12 increases the transmission level according to the request signal PR1. For example, in Table 1, when the reception level of the reception signal Rx1 is −97 [dBm], the transmission level of the transmission signal Tx1 is initially determined to be 17 [dBm]. When the request signal PR1 is received, In response to this, the transmission level is increased by, for example, 1 [dBm]. Alternatively, if information about the increase amount of the transmission level is included in the request signal PR1, the transmission level determination unit 12 increases the transmission level by the increase amount.

  Next, in step S12, the transmission level determination unit 12 determines whether or not the increased transmission level exceeds the maximum value. When the transmission level exceeds the maximum value, in step S13, the transmission level determination unit 12 limits the transmission level to the maximum value and ends the process. If the transmission level is equal to or lower than the maximum value in step S12, the process is terminated as it is.

  That is, the transmission level determination unit 12 increases the transmission level according to the request signal PR1 within a range where the transmission level is not more than the maximum value.

  The maximum value setting unit 13 sets the maximum value of the transmission level. More specifically, the maximum value of the transmission level is set based on whether or not contactless charging is performed. Whether or not contactless charging is performed is determined based on the determination result of the determination unit 14.

  When non-contact charging is not performed, the maximum value of the transmission level is set as follows. That is, referring to Table 1, the maximum value is set to a value equal to or higher than the initial value of the transmission level corresponding to the minimum value of the reception level. In the example of Table 1, the minimum value of the reception level is set to −104 [dBm]. At this time, the initial value of the transmission level is 24 [dBm]. Therefore, the maximum value when non-contact charging is not performed is set to 24 [dBm] or more.

  FIG. 9 is a flowchart showing an example of the operation of the maximum value setting unit 13. In step S20, the maximum value setting unit 13 determines whether or not contactless charging is performed. When it is determined that the non-contact charging is not performed, step S20 is executed again. When it is determined in step S20 that contactless charging is being performed, in step S21, the maximum value setting unit 13 reduces and sets the maximum value of the transmission level. That is, a value smaller than the maximum value of the transmission level when non-contact charging is not performed is adopted as the maximum value of the transmission level at the time of non-contact charging. For example, the maximum value setting unit 13 sets the maximum value of the transmission level to 21 [dBm].

  Next, in step S22, the maximum value setting unit 13 determines whether or not the non-contact charging is finished. This determination can also be made based on the determination result of the determination unit 14. When it is determined that the non-contact charging has not ended, step S22 is executed again. When it is determined that the non-contact charging is completed, the maximum value setting unit 13 returns the maximum value of the transmission level to the original value (for example, 24 [dBm]) in step S23.

  As described above, the maximum value setting unit 13 sets the maximum value of the transmission level when contactless charging is performed to be smaller than the maximum value of the transmission level when contactless charging is not performed. In describing this technical significance, first, an example of communication during contactless charging will be described.

<Reception confirmation operation in non-contact charging>
For example, the control unit 10 includes a reception confirmation processing unit 17 (see FIG. 7). The reception confirmation processing unit 17 performs a reception confirmation operation for confirming whether there is communication from the base station 2 every predetermined time (for example, 5 seconds). That is, the reception confirmation operation is repeated intermittently. A predetermined period of time can be measured using a known timer circuit. This reception confirmation operation is also performed when the battery 60 is charged. Therefore, the reception confirmation operation is performed even during non-contact charging.

  The reception confirmation operation may be performed according to the rules between the mobile wireless terminal 1 and the base station 2, but may be performed as follows, for example. That is, the reception confirmation processing unit 17 transmits a confirmation signal, and the base station 2 that has received this confirmation signal transmits a signal to be transmitted to the portable wireless terminal 1 (for example, an incoming signal for a call from another portable wireless terminal 1). , E-mail, etc.) and send the confirmation result. Upon receipt of the confirmation result, the reception confirmation processing unit 17 notifies the function unit that performs control according to the confirmation result. For example, when an incoming call signal is received from the portable radio terminal 1 of the call partner, this is notified to a call processing unit (described later). The call processing unit transmits to the base station 2 that the incoming signal has been received, and notifies the user of the incoming call. For example, the user is notified by a ring tone from the speaker 180 or the like.

  As described above, the portable wireless terminal 1 communicates with the base station 2 even during non-contact charging.

<Reception sensitivity during non-contact charging>
When non-contact charging is performed, as described above, an AC voltage is applied to the charger side coil 8a of the non-contact charger 8 and an alternating current flows. Therefore, the non-contact charger 8 generates the radio wave CW1. The radio wave CW1 is an electromagnetic wave having a fundamental wave component of the frequency of the alternating current flowing through the charger side coil 8a, for example, and includes a high-order frequency component.

  When the radio wave CW1 includes a frequency component that substantially matches the difference between the frequency of the transmission signal Tx1 and the frequency of the reception signal Rx1, an interference wave with respect to the reception signal Rx1 is generated due to intermodulation distortion between the frequency component and the transmission signal Tx1. .

<Maximum transmission level>
When performing communication, the base station 2 may request the portable radio terminal 1 to increase the transmission level. This is as already described, and may be performed during communication even during non-contact charging. Therefore, during the contactless charging, the transmission level determination unit 12 may increase the transmission level according to the request signal PR1 from the base station 2. In this case, the reception sensitivity of the portable wireless terminal 1 deteriorates as the transmission level increases. If the reception sensitivity deteriorates to some extent, the mobile radio terminal 1 may not be able to receive (analyze) the reception signal Rx1 from the base station 2 appropriately.

  For example, according to Table 1, when the reception level of the reception signal Rx1 is −99 [dBm], the initial value of the transmission level of the transmission signal Tx1 is determined to be 19 [dBm]. Here, as an example, it is assumed that the reception sensitivity at this time is −101 [dBm], for example. In this situation, since the reception level (−99 [dBm]) of the reception signal Rx1 is higher than the reception sensitivity (−101 [dBm]), the reception signal Rx1 can be appropriately analyzed.

  When the base station 2 transmits the request signal PR1, the transmission level determination unit 12 determines the transmission level to a value larger than 19 [dBm]. Thereby, reception sensitivity deteriorates. If the reception sensitivity exceeds −99 [dBm] as the transmission level increases, the received signal Rx1 cannot be analyzed properly. That is, although a certain degree of deterioration in reception sensitivity can be tolerated due to an increase in transmission level, it is desired to avoid deterioration beyond the required reception sensitivity.

  Therefore, the maximum value of the transmission level during non-contact charging is set smaller than the maximum value of the transmission level when non-contact charging is not performed. As a result, it is possible to avoid the reception sensitivity from deteriorating to a certain extent. Therefore, it is possible to reduce the possibility that the reception sensitivity exceeds the reception level, thereby contributing to appropriate reception (analysis) of the reception signal Rx1.

  A more detailed example will be described below. The maximum value of the transmission level when non-contact charging is not performed is, for example, equal to or higher than the transmission level (24 [dBm]) when the reception level is minimum, and is assumed here to be 24 [dBm] ( Table 1).

  For example, according to Table 1, when the reception level of the reception signal Rx1 is −99 [dBm], the initial value of the transmission level of the transmission signal Tx1 is determined to be 19 [dBm]. Assume that the reception sensitivity at this time is, for example, −101 [dBm]. Since the reception level −99 [dBm] is larger than the reception sensitivity −101 [dBm], the reception signal Rx1 can be appropriately analyzed.

  When the base station 2 transmits the request signal PR1, the transmission level determination unit 12 determines the transmission level to a value larger than 19 [dBm]. Thereby, reception sensitivity deteriorates. If the reception sensitivity exceeds -99 [dBm], the reception signal Rx1 cannot be analyzed appropriately.

  Therefore, the maximum value of the transmission level during non-contact charging is set smaller than the maximum value of the transmission level when non-contact charging is not performed. As a result, it is possible to avoid the reception sensitivity from deteriorating to a certain extent. Therefore, the possibility that the reception sensitivity exceeds the reception level can be reduced, which contributes to appropriate reception (analysis) of the reception signal Rx1.

  A more detailed example will be described below. For example, the maximum value of the transmission level when the non-contact charging is not performed is equal to or higher than the transmission level (24 [dBm]) when the reception level is minimum, and is 24 [dBm] here (Table 1). .

  Now, when non-contact charging is performed, reception sensitivity deteriorates. Moreover, the reception sensitivity deteriorates as the transmission level increases. FIG. 10 is a diagram schematically illustrating an example of the relationship of Table 1 (relationship between the reception level and the initial value of the transmission level) and the relationship between the transmission level and the reception sensitivity during contactless charging. Graph G1 shows the former relationship, and graph G2 shows the latter relationship. In FIG. 10, the horizontal axis represents the transmission level, and the vertical axis represents the reception sensitivity and the reception level.

  In the illustration of FIG. 10, during non-contact charging, the reception sensitivity is −98 [dBm] when the transmission level is 21 [dBm] (point P3). Although not shown in FIG. 10, the reception sensitivity (that is, the minimum value of the reception sensitivity) when the transmission level is almost zero is larger than the minimum value (−104 [dBm]) of the reception level shown in Table 1, for example, − 102 [dBm]. In addition, the minimum value of the reception level in Table 1 is the minimum value that can be appropriately received by the portable wireless terminal 1 when non-contact charging is not performed, for example, and is determined according to specifications.

  Now, it is assumed that the portable wireless terminal 1 receives a reception signal Rx1 having a reception level of −98 [dBm] from the base station 2 during non-contact charging. The reception level measuring unit 11 measures this reception level. Then, the transmission level determination unit 12 determines the initial value of the transmission level to 18 [dBm] according to the reception level according to Table 1 (see point P1 in FIG. 10).

  When the transmission level is 18 [dBm], the reception sensitivity is smaller than −98 [dBm], for example, −99.5 [dBm] (see point P2 in FIG. 10). That is, when the transmission level is 18 [dBm], the reception level (−98 [dBm]) of the reception signal Rx1 becomes higher than the reception sensitivity (−99.5 [dBm]), and the portable wireless terminal 1 is appropriately The received signal Rx1 can be analyzed.

  In this state, when the mobile radio terminal 1 receives the request signal PR1 from the base station 2, the transmission level determination unit 12 sets the transmission level to be higher than 18 [dBm]. For example, if the transmission level is determined to be 21 [dBm], the reception sensitivity is −98 [dBm] (see point P3 in FIG. 10). Therefore, if the transmission level is determined to be greater than 21 [dBm], the reception sensitivity is greater than the reception level (−98 [dBm]). At this time, it is difficult for the mobile wireless terminal 1 to properly analyze the received signal Rx1.

  Therefore, the maximum value setting unit 13 sets the maximum value of the transmission level during non-contact charging to a value smaller than the maximum value (24 [dBm]) when non-contact charging is not performed (here, 21 [dBm). ]). As a result, the reception sensitivity can be prevented from becoming higher than the reception level, and the reception signal Rx1 can be appropriately received.

  As described above, when the transmission level determining unit 12 increases the transmission level in accordance with the request signal PR1 from the base station 2, the reception sensitivity is deteriorated, but the maximum value setting unit 13 decreases the maximum value of the transmission level. By setting it, deterioration beyond a certain level of reception sensitivity is avoided.

  The maximum value of the transmission level may be determined in advance, or may be determined based on the reception level measured by the reception level measurement unit 11. This is because if the reception level is high, the reception signal Rx1 can be appropriately received even if the reception sensitivity is poor. In other words, as the reception level increases, the deterioration of reception sensitivity accompanying the increase in transmission level is allowed. Therefore, the maximum value of the transmission level may be set larger as the reception level of the reception signal Rx1 is larger. Conversely, the maximum value of the transmission level may be set smaller as the reception level is smaller.

  A transmission level (for example, 21 [dBm]) that matches or is smaller than the measured reception level (for example, −98 [dBm]) may be set as the maximum value of the transmission level. Thereby, the reception signal Rx1 can be received appropriately.

  Such a relationship between the reception level and the maximum value of the transmission level may be determined in advance and stored in the storage unit (for example, the storage unit 103), for example.

  Next, an example of the operation of the control unit 10 will be described with reference to the timing chart of FIG. In the timing chart of FIG. 11, a telephone call is made as described in detail later. Thus, first, an example of an operation related to a call will be briefly described. As shown in FIG. 12, the control unit 10 includes a call processing unit 18 and a display control unit 19. The display control unit 19 controls display on the display device 20.

  For example, the call processing unit 18 instructs the display control unit 19 to display a call screen based on a user operation. The display control unit 19 displays a call screen on the display device 20 as appropriate. The call screen includes a selection button for selecting a call partner, an input button for inputting a telephone number, a call button for calling the mobile wireless terminal 1 of the call partner, and an incoming call from the call partner A response button for answering the call, an end button for ending the call, and the like are appropriately arranged. Operations on these buttons are detected by the touch panel 30.

  When the user selects a call partner and operates a call button, the call processing unit 18 transmits a call signal to the mobile wireless terminal 1 of the call partner via the base station 2. The other party's portable wireless terminal 1 receives the call signal as an incoming signal. When the call partner answers, the call processing unit 18 receives a response signal from the portable radio terminal 1 as the call partner via the base station 2 and establishes a connection in the portable radio terminal 1 between the user and the call partner. Conversely, when a call signal from a call partner is received as an incoming signal, the reception confirmation processing unit 17 notifies the call processing unit 18 of this. The call processing unit 18 notifies the user that there is an incoming call, for example, by a ring tone. When the user operates the response button, a message to that effect is transmitted to the mobile wireless terminal 1 of the other party to establish a connection.

  The call processing unit 18 receives an audio signal from the mobile wireless terminal 1 of the other party and outputs the audio signal to the user via, for example, the piezoelectric vibration element 190, while inputting the audio from the user via the microphone 150. This is transmitted to the portable wireless terminal 1 of the other party. Also, when the user operates the end button, the call processing unit 18 transmits this to the portable radio terminal 1 of the other party of the call and releases the connection to end the call. Also when a call end signal is transmitted from the portable radio terminal 1 of the call partner, the call processing unit 18 releases the connection and ends the call.

  The call processing unit 18 can make a hands-free call. For example, the display control unit 19 displays a button capable of inputting whether or not to perform a hands-free call. When the user operates the button, the call processing unit 18 outputs an audio signal from the portable wireless terminal 1 of the other party at a relatively large volume from the speaker 180, and increases the sensitivity of the microphone 150 to relatively distant. Input the voice from the user. As a result, the user can make a call at a position away from the portable wireless terminal 1. Therefore, a call can be performed with the portable wireless terminal 1 placed on the non-contact charger 8.

  Alternatively, a hands-free call may be performed using the headset 4 capable of close proximity wireless communication. For example, the user sets the portable wireless terminal 1 to determine whether or not to make a call using the headset 4. This headset 4 is worn by the user. When an incoming call is received from the other party, the user operates a call response button provided on the headset 4. Thereby, the headset 4 transmits a response signal to the mobile wireless terminal 1. When the call processing unit 18 receives the response signal via the close proximity wireless communication unit 90, the call processing unit 18 transmits the response signal to the mobile wireless terminal 1 of the call partner and starts a call. The call processing unit 18 receives an audio signal from the portable radio terminal 1 of the call partner and transmits it to the headset 4. In addition, an audio signal from the user is received from the headset 4 and transmitted to the other portable radio terminal 1. Thereby, a telephone call can be performed. Since the user wears the headset 4 and makes a call, the call can be made with the portable wireless terminal 1 placed on the non-contact charger 8.

  In the timing chart of FIG. 11, a state where each operation is performed is shown as an active state of the signal, and a state where each operation is not performed is shown as an inactive state of the signal. For example, “placement” is a state in which the portable wireless terminal 1 is placed on the non-contact charger 8, and the fact that the user places the portable wireless terminal 1 on the non-contact charger 8 at time t 1 The signal in FIG. 2 is shown as a transition from the inactive state to the active state.

  Next, at the time t2, the non-contact charger 8 starts to apply an AC voltage to the charger side coil 8a. A period between time points t1 and t2 is a period required for the non-contact charger 8 to recognize the placement of the portable wireless terminal 1. At time t2, the magnetic flux of the charger side coil 8a is linked to the charging coil 82a, and the battery 60 is charged by the induced electromotive force of the charging coil 82a. That is, non-contact charging starts.

  Next, at time t3, the mobile radio terminal 1 that is the other party of the call transmits a call signal for a call to the base station 2. The “call call” shown in FIG. 11 is a call for the caller, and is an operation from transmission of a call signal to the end of the call. The base station 2 receives the calling signal and transmits it to the portable wireless terminal 1 as an incoming signal.

  At time t4, the call processing unit 18 receives the incoming signal from the base station 2 and responds to the base station 2 that the incoming signal has been received. At this time, the call processing unit 18 notifies the transmission level determining unit 12 that the incoming signal has been received. The transmission level determination unit 12 that has received the notification during non-contact charging reduces the maximum value of the transmission level of the transmission signal Tx1. That is, in the illustration of FIG. 11, the maximum value of the transmission level is reduced when a call is started in non-contact charging.

  Note that, unlike the example of FIG. 11, the maximum value setting unit 13 may reduce the maximum value of the transmission level at the start of non-contact charging (time point t2).

  Next, at time t5, the mobile wireless terminal 1 notifies the user that there is an incoming call. For example, notification is made by a ring tone. Next, at time t6, the user lifts the portable wireless terminal 1 from the non-contact charger 8 and operates the response button. The “response call” shown in FIG. 11 is an operation from the user operating the response button to the end of the call.

  In the example of FIG. 11, “placement”, “non-contact charging”, “maximum value reduction”, and “notification” transition to inactive at time t6. That is, since the mobile wireless terminal 1 is separated from the non-contact charger 8 and the non-contact charge is completed, the “placement” and the “non-contact charge” are changed to inactive, and the transmission level is reduced by the end of the non-contact charge. Since the maximum value is returned to the original value, “maximum value decrease” transitions to inactive. In addition, since it responds to the call, the incoming call notification is also terminated (“notification” transitions to inactive).

  At this time, since a call is performed without contactless charging, it is possible to appropriately perform communication (call) without deterioration of reception sensitivity due to contactless charging.

  Next, the call ends at time t7, and at time t8, the user places the portable wireless terminal 1 on the non-contact charger 8 again. Non-contact charging is started at time t9, and the portable wireless terminal 1 of the other party transmits a call signal at time t10. Next, at time t11, the call processing unit 18 transmits a response signal to the base station 2, and the maximum value setting unit 13 reduces the maximum value of the transmission level. Next, at time t12, the user is notified of the incoming call. Unlike the illustration of FIG. 11, the maximum value setting unit 13 may reduce the maximum value of the transmission level at the start of non-contact charging (time point t9).

  Next, at time t13, the user responds to the call in a state in which contactless charging is performed. Such a response can be made by, for example, a hands-free call (including a call using the headset 4).

  In the period (time t13 to time t14) in which a call is performed while non-contact charging is performed, the maximum value of the transmission level remains reduced. As a result, the reception signal Rx1 can be properly received, which contributes to a good call. When the call ends at time t14, the maximum value setting unit 13 restores the maximum value of the transmission level.

  In the example of FIG. 11, the maximum value of the transmission level is restored to the original value when the call ends, but the maximum value of the transmission level is reduced when contactless charging is performed even after the call ends. You can leave it. Then, the maximum value of the transmission level may be returned to the original when the non-contact charging ends. As a result, when the reception confirmation operation is performed during non-contact charging, the reception signal Rx1 can be received with more appropriate reception sensitivity.

Second embodiment.
In the second embodiment, the charging current flowing to the battery 60 is adjusted when performing non-contact charging. In the example of FIG. 13, a current detection unit 76 is further provided as compared with the configuration illustrated in FIG. 6. The current detection unit 76 detects a charging current in non-contact charging. More specifically, the current detection unit 76 detects a current output from the charging unit 80, for example.

  The control unit 10 further includes a current control unit 16. The current control unit 16 inputs the current detected by the current detection unit 76, and outputs a control signal for controlling the current adjustment unit 88 so that the current approaches a desired value.

  FIG. 14 is a graph schematically illustrating an example of a relationship between a charging current in contactless charging and reception sensitivity during contactless charging. Here, the transmission level is constant. In the illustration of FIG. 14, three graphs are shown when the frequency bands are different. Graphs 1a to 1c show the relationships in the low band, the medium band, and the high band, respectively, in the 1900 Hz band.

  As can be understood from FIG. 14, in the small region IR1 where the charging current is from zero to 200 [mA], the reception sensitivity increases as the charging current increases. That is, the reception sensitivity deteriorates. When the charging current further increases beyond this region IR1, the reception sensitivity decreases in a monotonically non-increasing manner with respect to the charging current (region IR2). When the charging current further increases, the reception sensitivity increases in a non-monotonic manner with respect to the charging current (area IR3).

  Thus, the reception sensitivity in the non-contact charging depends on the charging current. In the example of FIG. 14, there is a minimum value for the reception sensitivity. In other words, there is an extreme value that gives excellent reception sensitivity.

  When the reception level of the reception signal Rx1 is relatively high, the reception signal Rx1 can be appropriately received even if the reception sensitivity is poor. On the other hand, if the reception level of the reception signal Rx1 is small, a higher reception sensitivity is required.

  Therefore, the current control unit 16 determines the charging current based on the magnitude relationship between the reception level measured by the reception level measurement unit 11 and the reference value. FIG. 15 is a flowchart illustrating an example of the operation of the control unit 10. First, in step S30, the current control unit 16 determines whether or not contactless charging is performed. This determination is performed based on the determination result of the determination unit 14. When it is determined that the non-contact charging is not performed, step S30 is executed again. When it is determined that contactless charging is being performed, in step S31, the current control unit 16 determines whether the reception level measured by the reception level measurement unit 11 is greater than a reference value (for example, −97 [dBm]). Determine whether or not.

  If it is determined that the reception level is greater than the reference value, the charging current is controlled at, for example, a relatively large first current value in step S32. That is, when the reception level is high, an excellent reception sensitivity is not required, so the charging current is controlled with the first current value without considering the reception sensitivity. The specific first current value is determined in consideration of, for example, the charging time and the allowable current value of each part. Here, as an example, the first current value is determined from an area IR3 that is larger than the current value (for example, 500 mA) when the reception sensitivity takes an extreme value and the reception sensitivity deteriorates as the current increases. For example, the maximum value 900 mA in the region IR3 is adopted as the charging current. For example, the first current value is determined in advance and stored in a storage unit (for example, the storage unit 103). The current control unit 16 controls the current adjustment unit 88 so that the current detected by the current detection unit 76 approaches a first current value (for example, 900 mA).

  On the other hand, when it is determined in step S31 that the measured reception level is lower than the reference value, in step S33, the current control unit 16 sets the second charging current so that the reception sensitivity is higher than the reception sensitivity in step S32. Control by current value. Referring to FIG. 14, as the second current value, for example, a current value (for example, 500 mA) that gives an extreme value of reception sensitivity is adopted. Thereby, the reception signal Rx1 can be received with a reception sensitivity superior to the reception sensitivity in step S32. This second current value is also stored, for example, in advance in a storage unit (for example, the storage unit 103).

  Subsequent to step S32 or step S33, in step S34, the current control unit 16 determines whether or not the non-contact charging is finished. When it is determined that the non-contact charging has not ended, step S31 is executed again. The steps S31 to S33 are executed again in this way in consideration of fluctuations in the reception level depending on the communication state (so-called fading). That is, since the reception level can vary during non-contact charging, steps S31 to S33 are repeatedly executed to control the charging current according to the variation in the reception level. On the other hand, when it is determined in step S34 that the non-contact charging has ended, the current control unit 16 ends the operation of the current adjustment unit 88.

  As described above, in the second embodiment, when the reception level of the reception signal Rx1 is large and excellent reception sensitivity is not required, charging is prioritized over reception sensitivity and the charging current is set to the first current value. decide. On the other hand, when the reception level of the reception signal Rx1 is small and excellent reception sensitivity is required, the charging current is adjusted so that the reception sensitivity is higher than the reception sensitivity at the first current value (second). Current value). Thereby, even when the reception level is low, the reception signal Rx1 can be easily received appropriately.

  In the above-described example, a value larger than the second current value when the reception sensitivity is smaller than the reference value is adopted as the first current value when the reception level is larger than the reference value. Therefore, the charging time when the reception level is larger than the reference value can be shortened.

  Further, in the above-described example, even when the reception level is smaller than the reference value, the charging current is not zero, so that non-contact charging can be continued even at this time.

  However, unlike the above-described example, the charging current may be set to zero when the reception level is smaller than the reference value. That is, non-contact charging may be interrupted when the reception level is low. This interruption may be performed, for example, by stopping the operation of the current adjustment unit 88, or the interruption of the operation is transmitted to the non-contact charger 8, and the non-contact charger 8 interrupts the operation, thereby Contact charging may be interrupted. In the example of FIG. 14, since the reception sensitivity when the charging current is zero is smaller than the reception sensitivity at the extreme value, when the reception level is smaller than the reference value, the reception signal Rx1 is obtained with the most excellent reception sensitivity. Can be received. However, charging is not performed at this time. That is, priority is given to appropriate reception of the reception signal Rx1 at the expense of charging.

  Further, since the reception level varies depending on the communication state, the reference value may have hysteresis. That is, when the reception level is larger than the first reference value, the first current value (for example, 900 mA) is adopted as the charging current, and when the reception level is smaller than the second reference value (<first reference value), the reception sensitivity. A second current value (for example, 500 mA) that improves the above is employed. Thereby, even if the reception level fluctuates in a range between the first reference value and the second reference value, it can be suppressed that the charging current is switched due to the fluctuation.

  Further, when the reception level is smaller than the reference value, the current control unit 16 may control the charging current according to the reception level. More specifically, a current value that matches the reception level measured by the reception level measurement unit 11 or that provides a reception sensitivity smaller than the reception level is adopted as the second current value. For example, in the graph 1b, when the reception level is −98 [dBm], 800 [mA] (reception sensitivity −98.5 [dBm]) is adopted as the second current value, and the reception level is −99 [dBm]. Sometimes 700 [mA] (reception sensitivity -99 [dBm]) is employed as the second current value. For example, the current value corresponding to the reception level is stored in advance in the storage unit (storage unit 103).

  This also makes it possible to appropriately receive the reception signal Rx1. In addition, since the second current value is determined in accordance with the reception level, it is not necessary to employ a small current value that gives more reception sensitivity than necessary. Therefore, the selectivity of the second current value can be improved, and a relatively large second current value can be employed according to the reception level. Thereby, the charging time can be shortened.

<Reception confirmation operation>
As described above, the reception confirmation operation is intermittently performed even when non-contact charging is performed. Since the reception confirmation operation is performed intermittently, there is a period during which communication is not performed. Therefore, (i) during a period in which this communication is not performed, the current control unit 16 may control the current adjustment unit 88 with a relatively large current value (for example, the first current value, 900 mA). This is because the reception sensitivity may deteriorate when communication is not performed.

  On the other hand, in the reception confirmation operation during non-contact charging, the charging current may be determined in consideration of the reception level and reception sensitivity. However, the period spent for this reception confirmation operation is as short as about several tens of ms, for example. Therefore, it may be difficult to determine the charging current according to the magnitude relationship between the reception level and the reference value within the period. In this case, in the (ii) reception confirmation operation, the second current value (for example, 500 mA) may be adopted regardless of whether or not the reception level is higher than the reference value.

  Specifically, the operation (ii) is executed as follows, for example. The reception confirmation processing unit 17 notifies the current control unit 16 of starting the reception confirmation operation and ending the reception confirmation operation. Further, when the incoming signal is received, this is notified to the current control unit 16. The current control unit 16 controls the charging current with the second current value during the period from the start of the reception confirmation operation to the end (or reception of the incoming signal). Thereby, even during the reception confirmation operation in which the reception level of the reception signal Rx1 is unknown, the reception confirmation operation can be performed with excellent reception sensitivity, and the reception signal Rx1 can be easily received appropriately.

  On the other hand, when the reception confirmation processing unit 17 determines that the incoming signal has been received in the reception confirmation operation, the call processing unit 18 starts the call processing. More specifically, notification to the user (notification by ringtone or vibration) is performed, and if the user responds, the call is started. Since this call processing period is longer than the reception confirmation operation, (iii) during this call period, the current control unit 16 may determine the charging current according to the magnitude relationship between the reception level and the reference value. Good. Even when the user selects the other party to call and operates the calling button to start the call process, the current control unit 16 does not change the charging current according to the magnitude relationship between the reception level and the reference value during the call period. Make a decision.

  FIG. 16 is a timing chart showing an example of the operation of the control unit 10. As a difference from FIG. 11, the presence / absence of “determination of the charging current according to the magnitude relationship between the reception level and the reference value” is shown. In the example of FIG. 11, when the value of the charging current is determined according to the magnitude relationship between the reception level and the reference value, the signal is shown in the active state, and when the predetermined value is adopted, the signal is Is shown in an inactive state.

  In the example of FIG. 16, the magnitude relationship between the reception level and the reference value in the call period (the period from time t4 to time t6 and the period from time t11 to time t14) in a state where contactless charging is performed. The value of the charging current is determined according to On the other hand, in other periods, a predetermined value is adopted as the charging current. More specifically, as described above, (i) the second current value is adopted when communication is not performed, and (ii) the second current value is adopted in the reception confirmation operation.

  In summary, the charging current may be controlled as follows in non-contact charging. (i) The first current value is adopted during the period of no communication, (ii) the second current value is adopted during the reception confirmation operation (no incoming signal) period, and (iii) the reception level during the call period. The current value of the charging current is determined according to the magnitude relationship between the current value and the reference value.

  In the example of FIG. 13, the current control unit 16 inputs the current detected by the current detection unit 76 and controls the current adjustment unit 88 so as to approach a desired value. That is, the current is fed back and controlled. However, it is not always necessary to perform feedback control, and feedforward control may be performed. In this case, the current detector 76 is not necessary.

<An example of a combination of the first embodiment and the second embodiment>
FIG. 23 shows control of the maximum value of the transmission level, control of the charging current, and an example of the conditions. In the example of FIG. 23, when the frequency band is 800 MHz, control for reducing the maximum value of the transmission level is not performed. That is, here, it is assumed that the correlation between the reception sensitivity and the transmission level is small in the 800 MHz band.

  When the frequency band is 800 MHz, non-contact charging is stopped regardless of the level of the reception level of the reception signal Rx1 in the reception confirmation operation. That is, the charging current is set to zero. As a result, the reception confirmation operation can be performed with better reception sensitivity.

  On the other hand, during communication, the magnitude of the charging current is varied depending on whether the reception level is larger or smaller than the reference value. More specifically, when the reception level is greater than the reference value, contactless charging is performed with a charging current (for example, 900 mA) determined regardless of the reception sensitivity. On the other hand, when the reception level is lower than the reference value, the non-contact charging is stopped.

  Thus, since the reception sensitivity is not required when the reception level during communication is sufficiently high, contactless charging is performed at a normal current value, and when the reception level is low, priority is given to reception sensitivity and contactless charging is performed. It is stopped.

  Here, in the 800 MHz band, it is assumed that the reception sensitivity deteriorates stepwise with respect to the charging current as shown in FIG. Therefore, here, when the level is small by reception, the charging current is made zero.

  As described above, in the reception confirmation operation, charging is stopped regardless of the level of the reception level, and during communication, the charging current is varied according to the level of the reception level. This is because the period required for the reception confirmation operation is short. That is, since there is not a sufficient period for determining the magnitude of the reception level, the charging current is made zero in the reception confirmation operation regardless of the magnitude of the reception level.

  Next, a case where the frequency band is 1900 MHz will be described. In the example of FIG. 23, when the transmission signal Rx1 is transmitted during the non-contact charging regardless of the distinction between the reception confirmation operation and the communication and whether the reception level is higher than the reference value, Decrease the maximum level. That is, here, it is assumed that the reception sensitivity deteriorates as the transmission level increases in the 1900 MHz band. Thus, by reducing the maximum value of the transmission level, it is possible to receive the reception signal Rx1 with better reception sensitivity in non-contact charging.

  Further, when the frequency band is 1900 MHz, contactless charging is performed at a current value (for example, 500 mA) that can improve the reception sensitivity regardless of the reception level of the reception signal Rx1 in the reception confirmation operation. As a result, the reception confirmation operation can be performed with better reception sensitivity.

  On the other hand, during communication, the magnitude of the charging current is varied depending on whether the reception level is larger or smaller than the reference value. More specifically, when the reception level is greater than the reference value, contactless charging is performed with a first current value (for example, 900 mA) determined regardless of the reception sensitivity. On the other hand, when the reception level is smaller than the reference value, contactless charging is performed with a second current value (for example, 500 mA) that can improve reception sensitivity. In addition, the 2nd electric current value which can improve a receiving sensitivity here is an electric current value which gives a receiving sensitivity higher than the receiving sensitivity when a 1st electric current value is employ | adopted.

  As described above, when the reception level during communication is sufficiently high, reception sensitivity is not required, so contactless charging is performed with the normal first current value, and when the reception level is low, the second current value giving priority to reception sensitivity. In this way, non-contact charging is performed.

Third embodiment.
In the first embodiment, it has been described that the higher-order frequency component of the radio wave CW1 from the non-contact charger 8 and the transmission signal Tx1 cause an interference wave of the reception signal Rx1. Here, a frequency band that hardly causes such interference is considered. As an example of such a frequency band, for example, there is a frequency band in which neither the frequency of the transmission signal nor the sum of the higher-order frequencies of the electromagnetic wave generated from the charger side coil 8a matches the received signal. Here, “does not match” means, for example, that the difference between the sum and the frequency of the received signal is wider than the signal width (frequency width) of the received signal.

  Here, the 800 MHz band (transmission band is 824.7 to 848.31 [MHz], the reception band is 869.7 to 893.31 [MHz], or the transmission band is 817.9 to 823.1 [MHz], and the reception band is 862.9 as the frequency band that hardly generates interference waves) ~ 868.1 [MHz]).

  At this time, the correlation between the increase in the transmission level during contactless charging and the deterioration in the reception sensitivity is smaller than that in the frequency band described in the first embodiment. That is, in this frequency band, even if the transmission level is increased, the reception sensitivity does not deteriorate so much. Therefore, the maximum value setting unit 13 does not change the maximum value of the transmission level in this frequency band depending on the presence or absence of non-contact charging.

  The control unit 10 of FIG. 17 further includes a frequency band specifying unit 104 as compared to FIG. The frequency band specifying unit 104 specifies the frequency bands of the transmission signal Tx1 and the reception signal Rx1. For example, when a frequency band to be used is determined in advance, information about the frequency band is stored in a storage unit (for example, the storage unit 103), and the frequency band specifying unit 104 reads this storage unit and specifies the frequency band. May be. In this case, the wireless communication unit 110 performs communication only in that frequency band.

  Alternatively, the wireless communication unit 110 may support a plurality of frequency bands. That is, the wireless communication unit 110 may be able to communicate in a plurality of frequency bands. In this case, the control unit 10 performs communication by sequentially changing the frequency band via the wireless communication unit 110. For example, the reception confirmation operation will be described. First, the reception confirmation operation is performed in, for example, a first frequency band (for example, 1900 MHz band) where an interference wave is generated. If there is a signal (such as an incoming call) to be transmitted to the portable wireless terminal 1, an operation corresponding to the signal is performed. If there is no signal, the operation in the first frequency band is terminated. Subsequently, a reception confirmation operation is performed in a second frequency band (for example, 800 MHz band) in which interference waves are not easily generated. When there is a signal to be transmitted to the portable wireless terminal 1, an operation corresponding to the signal is performed, and when there is no signal, the operation in the second frequency band is ended. The frequency band specifying unit 104 specifies a frequency band in which communication is performed.

  When performing communication in the first frequency band, the maximum value setting unit 13 sets the maximum value of the transmission level during non-contact charging as described in the first embodiment when non-contact charging is not performed. The transmission level is determined to be smaller than the maximum value.

  On the other hand, when performing communication in the second frequency band, the maximum value setting unit 13 does not change the maximum value of the transmission level regardless of whether or not non-contact charging is performed. Thereby, the number of processes can be reduced and the process can be simplified.

<Charging current>
Next, charging current in non-contact charging will be described. In the second frequency band, the relationship between the charging current and the reception sensitivity in non-contact charging may change in a substantially step shape. FIG. 18 schematically shows an example of the relationship between the charging current and the reception sensitivity. When the charging current increases from zero, the receiving sensitivity rapidly deteriorates as the charging current increases, and when the receiving sensitivity reaches a certain level, the receiving sensitivity does not change much with respect to the change in the charging current. That is, the reception sensitivity increases rapidly when the charging current is small, and asymptotically approaches or converges to a certain level. Further, as illustrated in FIG. 18, the region where the reception sensitivity increases (the region of charging current) is narrow.

  In such a second frequency band, the current control unit 16 employs zero as the second current value when the reception level is smaller than the reference value. That is, when the reception level is smaller than the reference value, the non-contact charging is interrupted giving priority to the reception sensitivity. Referring to FIG. 15, in the second frequency domain, the current control unit 16 sets the charging current to zero in step S33.

  In the second embodiment, when the time spent for the reception confirmation operation is short for the determination of the current value according to the magnitude relationship between the reception level and the reference value, (ii) the second current value is used in the reception confirmation operation. The charging current was controlled. In the second frequency band, zero is adopted as the second current value even in the reception confirmation operation. That is, non-contact charging is interrupted also in the reception confirmation operation. As a result, in the reception confirmation operation in which the reception level is unknown, the reception confirmation operation can be performed with better reception sensitivity.

  In the above example, the 1900 MHz band and the 800 MHz band have been described. However, depending on the specifications of the portable wireless terminal 1 and the non-contact charger 8, the strength of the correlation between the transmission level and the reception sensitivity may be opposite between the 1900 MHz band and the 800 MHz band. In this case, the operation of the maximum value setting unit 13 is also reversed. In short, the maximum value setting unit 13 reduces the maximum value of the transmission level in the non-contact charging in the first frequency band having a strong correlation in which the reception sensitivity is deteriorated as the transmission level is increased. In the second frequency band where the correlation is weak, the maximum value of the transmission level is not changed depending on whether or not contactless charging is performed.

  Similarly, depending on the specifications of the portable wireless terminal 1 and the non-contact charger 8, the correlation between the charging current and the reception sensitivity may be opposite in the 1900 MHz band and the 800 MHz band from the above description. In this case, the operation of the current control unit 16 is also reversed. In short, the current control unit 16 has a reception level smaller than the reference value for a frequency band in which the reception sensitivity does not change relatively in response to a change in the charging current in an area used for charging (for example, 100 mA or more). When the reception confirmation operation is performed, the charging current is set to zero.

Fourth embodiment.
In the fourth embodiment, a display screen when an incoming call is received in a state where contactless charging is performed will be described. Further, here, as described in the second or third embodiment, the current control unit is in a period in which a call (including reception of an incoming signal or transmission of a calling signal) is performed while non-contact charging is performed. It is assumed that 16 adjusts the charging current according to the magnitude relationship between the reception level and the reference value. That is, it is assumed that the charging current is reduced when the reception level is smaller than the reference value.

  The display control unit 19 displays charging information related to a reduction in charging current in the display area 2a when a call is performed while performing non-contact charging. This charging information indicates a possibility that non-contact charging is suppressed during a call (that is, a possibility that the charging current is reduced).

  FIG. 19 is a flowchart illustrating an example of the operation of the display control unit 19. In step S40, the display control unit 19 determines whether or not contactless charging is performed. This determination is performed based on the determination result of the determination unit 14. When it is determined that the non-contact charging is not performed, step S40 is executed again.

  When it is determined that non-contact charging is being performed, in step S41, the display control unit 19 determines whether a call is being performed. This is done by notifying the display control unit 19 of information on whether or not the call processing unit 18 is making a call. When it is determined that no telephone call is made, step S40 is executed again.

  When it is determined that a call is being made, that is, when a call is made while performing non-contact charging, the display control unit 19 displays charging information on the display device 20 in step S42. FIG. 20 shows an example of a display screen (hereinafter referred to as a charging notification screen) displayed in the display area 2a. Charging information 19a is displayed in the display area 2a, and is schematically shown by a line in the illustration of FIG. This charging information 19a is, for example, a sentence, and for example, a sentence such as “Please note that non-contact charging may be suppressed during a voice call” may be employed. If the charging current is set to zero when the reception level is lower than the reference value, the charging information 19a indicates information about the possibility that charging is interrupted. For example, “contactless charging is interrupted during a voice call” Please note that it may be. "

  Next, in step S43, the display control unit 19 determines whether or not an end operation has been performed to end the display of the charging information 19a and thus the display of the charging notification screen. In the example of FIG. 20, an end button 19b is displayed on the charging notification screen. As the end operation, an operation for the end button 19b can be employed. When there is no operation on the end button 19b, step S43 is executed. When the end button 19b is operated, in step S44, the display control unit 19 ends the display of the charging information 19a and thus the display of the charging notification screen. Then, the display control unit 19 displays a call screen for ending the call.

  Thereby, the user can recognize the possibility that charging is suppressed or interrupted during a voice call. Therefore, when the remaining amount of the battery 60 is small and more efficient charging is desired, the user can take appropriate measures. More specifically, for example, the user connects a contact charger to the charging connector 84 and charges the battery 60 using the voltage of the charging connector 84. Alternatively, the user may recognize the charging information 19a and suppress the call.

  In step S42, the display control unit 19 may display not only the charging information 19a but also charging switching information 19c that prompts the user to charge using the voltage of the charging connector 84. Also in the illustration of FIG. 20, the charge switching information 19c is schematically indicated by an underline. As the charge switching information 19c, for example, a sentence such as “Recharging with a contact charger is recommended” can be adopted. Thus, the user can more directly recognize the necessity of charging using the voltage of the charging connector 84.

  In the above example, the display of the charging notification screen is terminated by the termination operation in step S43. However, the display may be terminated when the call is terminated and when the non-contact charging is terminated. .

  Here, a charging notification screen different from the notification screen is displayed. Therefore, it is desirable to display the charge notification screen at the next timing. For example, when an incoming signal is received from the mobile wireless terminal 1 of the other party, the display control unit 19 displays a call screen on which it can be input whether or not to respond to this, so the charging notification screen is not displayed at this timing. And if a user performs operation which responds with respect to an incoming call, the display control part 19 will display a charge notification screen.

  When the user performs an operation of selecting a call partner and transmitting a call signal, the display control unit 19 displays a call screen indicating that the call partner is being called. Therefore, the charging notification screen is not displayed at this timing. Then, when a response signal is received from the mobile wireless terminal 1 of the other party, the display control unit 19 displays a charging notification screen.

  As a result, the charging notification screen can be displayed without hindering operations related to the call.

  In the above example, the information 19a and 19c are displayed on the charge notification screen different from the call screen, but the information 19a and 19c may be displayed on the call screen.

  In the example described in the second and third embodiments, when the reception level during contactless charging is larger than the reference value, a relatively large first current value is adopted as the charging current, and the reception level is the reference level. When the value is smaller than the value, the second current value (including zero) smaller than the first current value is adopted. That is, the charging current is reduced when the reception level is smaller than the reference value. Therefore, the display control unit 19 may display the information 19a (or further information 19c) in the display area 2a when the reception level is lower than the reference value. That is, when the charging current is actually reduced, the information 19a (or further information 19c) is displayed.

  FIG. 21 is a flowchart showing an example of the operation of the display control unit 19. Compared with FIG. 19, step S45 is further executed. Step S45 is executed, for example, when a positive determination is made in step S41. On the other hand, step S42 is not executed only when there is a positive determination in step S41. In step S45, the display control unit 19 determines whether or not the reception level measured by the reception level measurement unit 11 is greater than a reference value. When the reception level is higher than the reference value, step S40 is executed. When the reception level is smaller than the reference value, step S42 is executed.

  According to this, information 19a (and information 19c) is displayed when the charging current is actually decreasing. Therefore, the user can recognize that the charging current is actually reduced. At this time, information indicating that the charging current is actually reduced can be adopted as the information 19a. For example, when the second current value is other than zero, a sentence such as “charging is suppressed” can be adopted, and when the second current value is zero, a sentence such as “charging is interrupted” is adopted. Can be adopted.

  When charging is interrupted, that is, when the second current value is zero, the charge amount of the battery 60 is reduced with a call. Therefore, in this case, the information 19a (or further information 19c) may be displayed using the reduction of the charge amount as a trigger.

  FIG. 22 is a flowchart showing an example of the operation of the display control unit 19. Compared with FIG. 19, step S46 is further executed. Step S45 is executed, for example, when a positive determination is made in step S41. On the other hand, step S42 is not executed only when there is a positive determination in step S41. In step S46, the display control unit 19 determines whether or not the rate of change of the charge amount of the battery 60 detected by the charge amount detection unit 78 with respect to time is negative. When it is determined that the rate of change is positive, it is determined that charging is being performed, and step S40 is executed again. If it is determined that the rate of change is negative, step S42 is executed.

  This also displays information 19a (or further information 19c) when charging is actually interrupted. Therefore, the user can know that charging is interrupted. Further, as the information 19a, information indicating that the charging current is actually interrupted (in the middle of being interrupted) can be employed. For example, a sentence such as “charging is interrupted” can be employed. .

  In the above example, even when the charge is maintained even when the reception level is lower than the reference value, that is, when the second current value is other than zero, the display control unit 19 suppresses the charge. Information 19a to that effect was displayed. However, in this case, the information 19a and 19c need not be displayed. Suppressing charging is not necessarily important information for the user, so it is not displayed. Thereby, processing can be simplified.

  For example, in the 1900 MHz band, when the reception level is smaller than the reference value, the charging current is controlled at 500 mA, and in the 800 MHz band, the charging current is controlled to zero when the reception level is smaller than the reference value. . In this case, when the display control unit 19 performs a call using the 1900 MHz band while performing non-contact charging, the display control unit 19 performs communication using the 800 MHz band while performing non-contact charging without displaying the information 19a and 19c. In addition, the information 19a (or further information 19c) is displayed.

<Display modification>
In the above-described example, the information 19a (and the information 19c) is displayed by using a call while performing non-contact charging as a trigger. However, the display control unit 19 may display the information 19a using a non-contact charge as a trigger. This also allows the user to recognize that charging is interrupted or suppressed during a voice call.

  However, if the information 19a is displayed using the fact that non-contact charging has been performed as a trigger, the display screen displayed on the display device 20 when the non-contact charging is started may be hindered. Therefore, the display control unit 19 may display the information 19a (and further the information 19c) triggered by a predetermined operation by the user in a state where non-contact charging is performed. This predetermined operation may be an arbitrary operation. For example, when performing a non-contact charge and displaying a pictorial diagram showing it on the upper part (pict region) of the display region 2a, an operation on the pictorial diagram can be adopted. Alternatively, in response to a predetermined first operation, a screen (Notification Window) for explaining a picture to be displayed in the pictogram area is displayed, and an explanation area for the picture (area for explaining non-contact charging) is displayed. When receiving the second operation, the information 19a (or further information 19c) may be displayed.

  According to this, even if non-contact charging is performed, the information 19a (or further information 19c) is not displayed unless there is an operation by the user. Therefore, the display screen displayed in the display area 2a at the time of non-contact charging is not obstructed. On the other hand, since the information 19a (or further information 19c) is displayed by an operation by the user, the user can recognize the possibility that charging is suppressed.

  As described above, the portable wireless terminal 1 has been described in detail. However, the above description is an example in all aspects, and the present invention is not limited thereto. In short, the above-described technique can be applied to any device having a function of performing contactless charging, a function of performing wireless communication with an external device, and a display device. For example, the present invention can also be applied to devices mounted on automobiles, personal computers (for example, notebook personal computers), and the like. Further, the various embodiments and modifications described above can be applied in combination as long as they do not contradict each other. And it is understood that the countless modification which is not illustrated can be assumed without deviating from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Portable radio | wireless terminal 2a Display area 13 Maximum value setting part 12 Transmission level determination part 20 Display apparatus 60 Battery 110 Radio | wireless communication part 8a Charger side coil 82a Charging coil 84 Charging connector 86 Selection part

Claims (11)

A wireless device capable of making a call with a wireless device of a communication partner,
A charging coil that generates an induced electromotive force by interlinking of magnetic flux from an external charger side coil; and
A battery that is charged by being supplied with a charging current by the induced electromotive force;
A wireless communication unit that performs wireless communication with the wireless device of the other party,
A display device;
A communication processing unit that communicates with the wireless terminal of the communication partner via the wireless communication unit and performs processing related to the call;
A display control unit for displaying charging information on the reduction of the charging current during a call on the display device when making a call while performing charging using the induced electromotive force ;
A charge amount detection unit for detecting the amount of charge stored in the battery ,
The said display control part is a radio | wireless apparatus which displays the said charge information on the said display apparatus, when the rate of change with respect to the time of the said electric charge amount is negative . A wireless device capable of making a call with a wireless device of a communication partner,
A charging coil that generates an induced electromotive force by interlinking of magnetic flux from an external charger side coil; and
A battery that is charged by being supplied with a charging current by the induced electromotive force;
A wireless communication unit that performs wireless communication with the wireless device of the other party,
A display device;
A communication processing unit that communicates with the wireless terminal of the communication partner via the wireless communication unit and performs processing related to the call;
A display control unit for displaying charging information on the reduction of the charging current during a call on the display device when making a call while performing charging using the induced electromotive force;
A reception level measurement unit for measuring a reception level of a reception signal received by the wireless communication unit;
A current adjustment unit that adjusts the charging current so that the reception sensitivity is higher than the reception sensitivity when the reception level is greater than the reference value when the reception level is less than the reference value;
With
The wireless communication unit supports both the first frequency band and the second frequency band,
The current adjustment unit adjusts the charging current by a value other than zero when the reception level is smaller than the reference value in the first frequency band, and the reception level is the value in the second frequency band. When smaller than the reference value, the charging current is set to zero,
In the first frequency band, the transmission band and the reception band are 1851.25 to 1908.75 [MHz] and 1931.25-1988.75 [MHz], respectively, and in the second frequency band, the transmission band and the reception band are 824.7 to 848.31 [MHz], respectively. And 869.7-893.31 [MHz], or 817.9-823.1 [MHz] and 862.9-868.1 [MHz],
The display control unit displays the charging information on the display device in a call using the second frequency band without displaying the charging information in a call using the first frequency band. . A wireless device capable of making a call with a wireless device of a communication partner,
A charging coil that generates an induced electromotive force by interlinking of magnetic flux from an external charger side coil; and
A battery that is charged by being supplied with a charging current by the induced electromotive force;
A wireless communication unit that performs wireless communication with the wireless device of the other party,
A display device;
A communication processing unit that communicates with the wireless terminal of the communication partner via the wireless communication unit and performs processing related to the call;
A display control unit for displaying charging information on the reduction of the charging current during a call on the display device when making a call while performing charging using the induced electromotive force;
A transmission level determination unit for determining the transmission level so as not to exceed a maximum value while increasing a transmission level of a transmission signal transmitted from the wireless communication unit in response to an external request;
A maximum value setting unit for setting the maximum value when charging using the induced electromotive force is performed to be smaller than the maximum value when charging using the induced electromotive force is not performed;
A wireless device comprising: The wireless device according to any one of claims 1 to 3 ,
A charging connector to which an external contact charger is detachably connected;
Selecting one of the voltage of the charging connector and the induced electromotive force, and further comprising a selection unit for charging the battery using the one,
The said display control part is a radio | wireless apparatus which displays the charge switching information which recommends the charge using the said contact charger on the said display device, when performing a telephone call while performing the charge using the said induced electromotive force. The wireless device according to claim 1, 3 or 4 ,
A reception level measurement unit for measuring a reception level of a reception signal received by the wireless communication unit;
A current adjusting unit that adjusts the charging current so that the reception sensitivity is higher than the reception sensitivity when the reception level is higher than the reference value when the reception level is lower than the reference value; , Wireless device. A wireless device according to claim 2 or 5 , wherein
The wireless device, wherein the current adjustment unit sets the charging current to zero when the reception level is smaller than the reference value. The wireless device according to claim 2 or 6 ,
The said charge information is a radio | wireless apparatus which is information which shows that the said charging current may reduce.
The wireless device according to claim 6 ,
The charging information is a wireless device that is information indicating that the charging may be interrupted. The wireless device according to claim 2, 5 or 6 ,
The display control unit is a wireless device that displays the charging information on the display device when the reception level is lower than the reference value. A wireless device according to claim 1 or 9 , wherein
The wireless device, wherein the charging information is information indicating that the charging current is being reduced.   A wireless device that makes a call with a wireless device of a communication partner,
  A charging coil that generates an induced electromotive force by interlinking of magnetic flux from an external charger side coil; and
  A battery that is charged by being supplied with a charging current by the induced electromotive force;
  A wireless communication unit;
  A display device;
  A call processing unit that communicates with the other party's wireless terminal via the wireless communication unit and performs processing related to the call;
A method of controlling display on the display device in a wireless device comprising:
  When making a call while performing charging using the induced electromotive force, charging information related to the reduction of the charging current during the call is displayed on the display device,
  While increasing the transmission level of the transmission signal transmitted from the wireless communication unit in response to an external request, the transmission level is determined so as not to exceed the maximum value,
  A display control method in a wireless device, wherein the maximum value when charging using the induced electromotive force is performed is set smaller than the maximum value when charging using the induced electromotive force is not performed. .

Images