JP5924964B2 - Communication terminal - Google Patents

Description

  The present invention relates to a communication terminal, and more particularly to a communication terminal that is contactlessly charged.

  A universal standard for contactless charging (noncontact charging) using electromagnetic waves has been established, and various devices can be charged without worrying about the shape of the charging terminal. However, in the specification range, consideration for radio wave interference to the communication terminal is not yet sufficient, and the combination of the communication device and the charger cannot completely guarantee that it does not interfere with communication.

  For example, in the case of a multi-coil power transmission device, power transmission to a power receiving device with a built-in coil of various diameters must be assumed, and the position of the power receiving coil must be detected. It is necessary to have a built-in design. In that case, the size of the power receiving device and the position of the power receiving coil are detected, and control is performed so that power is transmitted from only the minimum necessary coils, so that the communication of the power receiving device is not interfered.

  However, as the size of the power receiving device and the position of the receiving coil are increased, when a large number of devices are released from a plurality of manufacturers, the number of combinations increases, and there remains a problem that it cannot be completely guaranteed that the device does not interfere with communication.

  Therefore, the following techniques have been proposed in order to suppress the influence of interference on other processes such as communication without depending on the position / size of the coil.

  In Patent Document 1 (Japanese Patent Laid-Open No. 2011-172437), the communication device selects whether to receive on the current channel or on another channel based on the influence on reception during power reception from the power supply device. To do.

  In Patent Document 2 (Japanese Patent Laid-Open No. 7-87678), when the switching regulator of the AC / DC converter intermittently operates to start charging the secondary battery, the base station starts from a timing that is not affected by switching noise. By receiving this transmission wave, a call is secured without being adversely affected by switching noise even during charging.

  In Patent Document 3 (Japanese Patent Application Laid-Open No. 2009-290928), in an electronic device driven by power received in a non-contact manner from a charging device, charging is performed before analog signal processing is started based on operation timing of analog signal processing. A power supply stop signal for instructing the apparatus to stop power supply is transmitted.

  In Patent Document 4 (Japanese Patent Application Laid-Open No. 11-168837), a charger that performs non-contact charging of a portable terminal is a charge control circuit that performs on / off control of a charging operation in accordance with a signal that represents a communication operation timing of the portable terminal. Built in.

  In Patent Document 5 (Japanese Patent Application Laid-Open No. 2003-250233), a non-contact power supply apparatus performs power supply control by identifying a power supply status for a non-contact power reception apparatus having a load.

  In Patent Document 6 (Japanese Patent Application Laid-Open No. 2011-30404), it is determined whether or not the battery needs to be charged based on information related to charging the battery, and the Q value of the antenna is selectively selected according to the determination result. By setting, non-contact communication and non-contact charging are performed using one antenna.

  In Patent Document 7 (Japanese Patent Laid-Open No. 2011-152008), power used for data communication and device operation after performing authentication between devices in a transmission system that transmits power in a contactless manner between a host and a device. Transmission is possible.

  Patent Document 8 (Japanese Patent Laid-Open No. 7-326984) proposes a communication method in which power is supplied from a main apparatus to a communication medium by a power carrier wave and data is transmitted from the communication medium to the main apparatus. Yes.

  Patent Document 9 (Japanese Patent Application Laid-Open No. 2011-172910) proposes a configuration in which the power supply is restricted during a period in which radiographic imaging is performed in a radiographic imaging apparatus.

  In Patent Document 10 (Japanese Patent Application Laid-Open No. 2009-247125), an electronic device has a secondary battery that is contactlessly charged, and based on the voltage value of the secondary battery at the start of charging, the charging process time and data communication process We propose a configuration that changes with time.

JP 2011-172437 A JP 7-87678 A JP 2009-290928 A JP-A-11-168837 JP 2003-250233 A JP 2011-30404 A Japanese Unexamined Patent Publication No. 2011-152008 JP 7-326984 A JP 2011-172910 A JP 2009-247125 A

  Among the above-mentioned patent documents, Patent Documents 3, 4, 6, and 10 limit charging of the secondary battery (or battery). In that case, since it cannot fully charge, it becomes difficult to guarantee the stable operation | movement about the apparatus which uses a secondary battery (or battery) as a power supply source.

  Therefore, an object of the present invention is to provide a communication terminal that prevents the influence of interference between an electromagnetic wave used for non-contact charging and a communication signal.

  A communication terminal according to an aspect of the present invention includes a communication circuit connected to a communication line, a circuit unit including a circuit different from the communication circuit, a communication control unit for controlling the communication circuit, a secondary battery, A power supply unit for supplying power from the secondary battery to the circuit unit, a transmission circuit for transmitting a command to a charger for charging the secondary battery in a non-contact manner using electromagnetic waves, and a charger A charge control unit for controlling charging by an operation mode, an operation mode control unit for controlling operation modes of different circuits, and an interference detection unit for detecting whether electromagnetic waves and communication signals interfere with each other. Prepare.

  When the interference is detected, the operation mode control unit outputs an instruction for switching the operation mode to the power saving mode that reduces the power consumption amount to a different circuit, and may interfere. When detected, the charge control unit transmits a command for reducing the magnetic flux density of the electromagnetic wave to the charger via the transmission circuit.

  Preferably, the interference detection unit detects that there is interference when the strength of the communication signal decreases to a predetermined threshold value.

  Preferably, the interference detection unit detects an index value indicating a state of charge of the secondary battery by the charger, and detects that there is interference when the detected index value decreases to a predetermined value.

  Preferably, when the value representing the communication quality based on the communication signal decreases to a predetermined value, the interference detection unit detects that there is interference.

  If the other situation of this invention is followed, the method of controlling charge of the secondary battery of a communication terminal will be provided.

  The communication terminal includes a circuit unit including a communication circuit connected to a communication line, a circuit different from the communication circuit, and a power supply unit for supplying power from the secondary battery to the circuit unit.

  A method for controlling charging includes a step of detecting whether or not an electromagnetic wave and a communication signal interfere with each other, and when the interference is detected, the operation mode of different circuits is reduced in power consumption. A step of outputting a command for switching to the power saving mode to a different circuit; and a step of transmitting a command for lowering the magnetic flux density of the electromagnetic wave to the charger when the interference is detected.

  When the further another situation of this invention is followed, the program for making a processor perform the method of controlling said charging is provided.

  According to still another aspect of the present invention, there is provided a machine-readable recording medium that records a program for causing a processor to execute the method for controlling charging.

  According to the present invention, the influence of interference between an electromagnetic wave used for non-contact charging and a communication signal is prevented.

It is the external view which showed the communication terminal and the charger. It is the schematic which shows the hardware constitutions of a communication terminal and a charger. It is a figure which shows typically the function structure of the communication terminal which concerns on 1st Embodiment. It is a processing flowchart concerning a 1st embodiment. It is a figure which shows typically the function structure of the communication terminal which concerns on 2nd Embodiment. It is a processing flowchart concerning a 2nd embodiment. It is a figure which shows typically the function structure of the communication terminal which concerns on 3rd Embodiment. It is a processing flowchart concerning a 3rd embodiment. It is a figure which shows typically the function structure of the communication terminal which concerns on 4th Embodiment. It is a processing flowchart concerning a 4th embodiment.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 is an external view showing a communication terminal 1 and a charger 2 that charges the communication terminal 1. Here, the communication terminal 1 exemplifies a multi-function communication terminal (smart phone). However, the communication terminal 1 is not limited to the multi-function communication terminal as long as it is a contactless charging communication terminal.

  In FIG. 1, a communication terminal 1 is a terminal such as a mobile phone powered by a secondary battery (for example, a lithium battery), a call function, a connection function with various communication lines such as the Internet, and a data communication function such as e-mail. In addition, various information processing functions are provided, and communication with other communication terminals via the nearest base station is possible, making it possible to make calls, send and receive e-mails, and view Web (World Wide Web) pages. Further, the housing of the communication terminal 1 is formed with a memory mounting portion 151 to which an external memory medium 15 is detachably mounted, and a CPU (Central Processing Unit) 21 described later is mounted on the memory mounting portion 151. The memory medium 15 is accessed (read / write).

  The charger 2 has a function of charging the secondary battery of the communication terminal 1 by a non-contact charging method. Specifically, it is a contactless charger that charges the communication terminal 1 by electromagnetic induction, and is connected via a cable 7 to a commercial power source (not shown). In order to charge the secondary battery of the communication terminal 1, the user places the communication terminal 1 on the electromagnetic wave radiation surface of the charger 2 when connecting the communication terminal 1 to the charger 2. The charger 2 is not limited to being connected to a commercial power source via the cable 7, but is connected to an external device (computer, audiovisual device, etc.) not shown, and uses a power source supplied via these devices. The charging function may be exhibited.

  The front surface of the charger 2 includes an operation unit 8 and a display 9 for receiving user operations. The operation unit 8 is provided with a power switch, a charging start switch, and the like. The electromagnetic wave radiation surface on the upper surface of the charger 2 is a placement surface to which the communication terminal 1 is connected (placed), and a primary coil for charging is buried below the placement surface. Is done.

  The communication terminal 1 includes a touch panel 5 in which a display for displaying various types of information and an input unit for receiving a user operation are integrally configured, and an operation unit 6. The operation unit 6 includes a power button, a charge start / stop switch, a communication start / end switch, and the like.

  FIG. 2 is a schematic diagram showing a hardware configuration of the communication terminal 1 and the charger 2 according to the embodiment of the present invention. Referring to FIG. 2, communication terminal 1 connects antenna 4 to communication circuit 10 for communicating with base station 3, processor 20 for centrally controlling the operation of communication terminal 1, and communication circuit 10. A transmission signal processing unit 30 and a reception signal processing unit 50 connected to each other, an input processing unit 40 connected to the transmission signal processing unit 30, and an output processing unit 60 connected to the reception signal processing unit 50 are provided.

  The communication terminal 1 further includes a battery 80 as a secondary battery that is a power supply source of the communication terminal 1, a power supply unit 70 for supplying power from the battery 80 to each unit of the communication terminal 1, and a charge state of the battery 80 A charging state monitoring unit 110 for monitoring the charging, a charging control unit 90 for controlling charging of the battery 80, and a communication circuit 100 for connecting the light emitting / receiving unit 92 to communicate with the charger 2.

  The communication circuit 10 includes a transmission circuit 12 for modulating and outputting a transmission signal output from the transmission signal processing unit 30, a reception circuit 13 and a switch for demodulating and outputting a signal received via the antenna 4 A circuit 11 is provided. The switch circuit 11 is switched to one of a state in which a signal output from the transmission circuit 12 is derived to the antenna 4 and a state in which a signal received from the antenna 4 is derived to the reception circuit 13. Here, the transmission path and the reception path are switched using the switch circuit 11, but the switch circuit 11 may be omitted by providing a unique path for each of the transmission path and the reception path.

  The processor 20 includes a CPU 21, a ROM (Read Only Memory), a RAM (Random Access Memory), a memory 22 including a nonvolatile memory, a timer 23, and an output I / O for controlling input / output between the processor 20 and the outside. F (Interface) 24 and input I / F (Interface) 25 are included.

  The communication circuit 100 includes a transmission circuit 101. When receiving a charge stop command given from the charge control unit 90, the transmission circuit 101 transmits it to the charger 2 via the light emitting / receiving unit 92.

  The charging control unit 90 connects a coil unit 91 including a secondary side coil for charging, and charges the battery 80 using an electrical signal derived from the coil unit 91.

  The charger 2 includes a communication control unit 200, a charge control unit 202, a coil unit 203 including a primary side coil, and a light emitting / receiving unit 204. The communication control unit 200 includes a communication circuit 201 for communicating with the communication terminal 1 via the light emitting / receiving unit 204.

  When charging the communication terminal 1, the charging control unit 202 excites the primary coil of the coil unit 203 with the supplied power. Electric power is transmitted to the secondary coil of the coil portion 91 of the communication terminal 1 by the induced magnetic field generated thereby. The electric power transmitted to the coil unit 91 is supplied to the battery 80 by the charge control unit 90, and the battery 80 is charged.

  Between the light emitting / receiving unit 204 and the light receiving / emitting unit 92, optical communication such as infrared rays is performed as short-range wireless communication. The communication between the communication terminal 1 and the charger 2 is not limited to an optical signal as long as it is a medium that does not interfere with an electromagnetic wave signal.

(First embodiment)
FIG. 3 is a diagram schematically illustrating a functional configuration of the communication terminal 1 according to the first embodiment. Referring to FIG. 3, the CPU 21 of the communication terminal 1 detects an interference detection unit 211 and a power supply unit 70 for detecting whether or not an electromagnetic wave for charging interferes with a communication signal via the antenna 4. A power supply control unit 212 for controlling the communication circuit 10 and a communication control unit 213 for controlling the communication circuit 10 are included. In the nonvolatile storage area of the memory 22, an intensity threshold 221 for the electric field intensity of the electromagnetic wave is stored.

  FIG. 4 is a process flowchart according to the first embodiment. First, in the aspect of FIG. 1, when charging of the communication terminal 1 is started (step S3), the CPU 21 determines that communication is started when switching to the communication mode (step S5). If it is determined that communication has not started (NO in step S5), the process in step S5 is repeated. Thereby, the charging by the charger 2 is continued.

  Here, the operation mode of the communication terminal 1 includes a plurality of modes including a communication mode in which communication is performed via the antenna 4 by the communication circuit 10. The CPU 21 switches the operation mode to the communication mode in accordance with a communication start instruction input by operating the switch of the operation unit 6. Alternatively, when the communication circuit 10 detects an incoming call / mail, the communication control unit 213 switches the operation mode to the communication mode.

  If it is determined that communication has started after the start of charging (YES in step S5), the interference detection unit 211 reads the intensity threshold 221 from the memory 22 (step S6), and the electric field intensity detection unit 216 detects the electric field intensity ( Step S7). The electric field strength detection unit 216 detects the electric field strength of the reception signal output from the switch circuit 11. The electric field strength is expressed as an RSSI (Received Signal Strength Indicator) value.

  Subsequently, the interference detection unit 211 compares the detected electric field intensity with the intensity threshold value 221 and determines whether or not a condition (electric field intensity ≧ intensity threshold value) is satisfied based on the comparison result (step S11). While it is determined that the condition is not satisfied, that is, while it is determined that the detected electric field intensity exceeds the intensity threshold value 221, the electric field intensity detection process in step S 7 and the condition establishment determination process in step S 11 are performed. Repeated.

  On the other hand, if it is determined that the condition (electric field intensity ≦ intensity threshold) is satisfied (YES in step S11), a charge stop command is transmitted from communication terminal 1 to charger 2 (step S13). Specifically, when the interference detection unit 211 determines that the condition of (electric field strength ≦ intensity threshold) is satisfied, it outputs a stop command to the charge control unit 90. When the command is input, the charging control unit 90 requests the communication circuit 100 to transmit charging stop. The transmission circuit 101 of the communication circuit 100 controls the light emitting / receiving unit 92 to transmit a charge stop command.

  In the charger 2, when the communication circuit 201 receives a charge stop command via the light emitting / receiving unit 204, it outputs the charge stop command to the charge control unit 202. When the charging control unit 202 inputs a charging stop command, the charging control unit 202 stops the excitation of the primary side coil of the coil unit 203. As a result, power transmission to the communication terminal 1 is stopped and charging is stopped.

  Thereafter, the communication control unit 213 determines whether or not communication is completed based on input / output signals between the communication circuit 10 and the antenna 4. Alternatively, the CPU 21 determines whether or not the communication is terminated based on a signal generated by a switch operation on the operation unit 6. While it is not determined that the communication is finished (NO in step S15), that is, while the communication is continued, the process of step S15 is repeated. However, when it is determined that the communication is finished (YES in step S15), a series of processes are performed. finish.

  Thus, in the case where communication via the antenna 4 in the communication terminal 1 and charging of the battery 80 by non-contact charging are performed in parallel, the electric field strength of the communication signal is attenuated by interference, and a predetermined strength threshold value is set. If it becomes less than 221, stable communication cannot be secured, so a charge stop command is transmitted from the communication terminal 1 to the charger 2 and the electromagnetic wave output for charging stops. As a result, interference is eliminated and stable communication is possible.

  Here, in order to eliminate the interference, the current flowing through the primary coil is set to zero and the output of the electromagnetic wave for charging is stopped. However, instead of setting the current to zero and the generated magnetic flux density to zero, You may make it reduce the electric current sent through a primary coil so that the magnetic flux density of electromagnetic waves may be reduced to the level which can avoid interference.

(Second Embodiment)
In the present embodiment, the communication terminal 1 is normally in a normal power mode in which predetermined power is supplied to each unit by the power supply unit 70. However, when charging is stopped by transmission of a charge stop command, the communication terminal 1 The power supply unit 70 is switched to a power saving mode that reduces the amount of power supplied to a predetermined portion.

  FIG. 5 is a diagram schematically illustrating a functional configuration of the communication terminal 1 according to the second embodiment. Referring to FIG. 5, CPU 21 of communication terminal 1 includes an operation mode control unit 214 in addition to the configuration of FIG. 3. The other configuration is the same as that of FIG. The non-volatile storage area of the memory 22 stores the intensity threshold 221 and the flag 224 described above. The flag 224 indicates whether the communication terminal 1 is in the normal power mode (flag = “0”) or the power saving mode (“1”). The operation mode control unit 214 rewrites the value of the flag 224 to indicate the mode after switching in order to switch the communication terminal 1 between the normal power mode and the power saving mode.

  FIG. 6 is a process flowchart according to the second embodiment. The flowchart of FIG. 4 is compared with the flowchart of FIG. 6 in that the communication terminal 1 is switched to the power saving mode when a charge stop command is transmitted from the communication terminal 1 to the charger 2 (step S13). If it is determined that the communication is completed (YES in step S15), the power saving mode is canceled (step S17), and the series of processes is completed. The other processes in FIG. 6 are the same as those in FIG. 4, and description thereof will not be repeated.

  Explaining the difference, in step S14, when the charging stop command is transmitted, the charging control unit 90 detects that the power transmission from the charger 2 is stopped based on the voltage of the output terminal of the secondary coil. Then, the processor 20 is notified of the charging stop. When the operation mode control unit 214 receives the notification after transmitting the charge stop command, the operation mode control unit 214 rewrites the flag 224 from “0” to “1”. The power supply unit 70 monitors the flag 224. When the value of the flag 224 is changed from “0” to “1”, the power supply amount to each unit is reduced from the normal power mode amount by a predetermined amount. Transition to power saving mode. Therefore, the power consumption of the communication terminal 1 is less than usual. Thereafter, the process proceeds to step S15.

  In step S17, when it is determined that the communication is finished, the operation mode control unit 214 rewrites the flag 224 from “1” to “0”. When the value of the flag 224 is rewritten from “1” to “0”, the power supply unit 70 operates to return the amount of power supplied to each unit to the amount of the normal power mode (original supply power amount).

  In the power saving mode, the operation mode control unit 214 outputs a command to an oscillator (not shown) that supplies a clock to the CPU 21 and controls to increase the cycle of the supplied clock. Alternatively, an instruction is output to the output processing unit 60 to reduce the backlight brightness on the display of the touch panel 5. As a result, the amount of power required by the CPU 21 or the display is reduced, and the amount of power supplied by the power supply unit 70 can be reduced. That is, the voltage drop amount of the battery 80 can be reduced.

  Thus, in the case where communication via the antenna 4 and the charging of the battery 80 by non-contact charging are performed in parallel in the communication terminal 1, the electric field strength of the communication signal becomes less than a predetermined strength threshold 221. In this case, since the electromagnetic wave for charging interferes with the communication signal and stable communication cannot be ensured, a charging stop command is transmitted from the communication terminal 1 to the charger 2 to output the electromagnetic wave for charging. Is stopped and the mode of the communication terminal 1 is switched from the normal power mode to the power saving mode. Thereby, interference is eliminated and stable communication is possible, and even when charging is stopped, the battery 80 during communication can be prevented from running out by suppressing power consumption.

  Note that the amount of power consumption to be reduced may be stepwise according to the length of the charge stop period from when the charge stop command is transmitted until the end of communication is determined. In other words, when the charging stop period is within a relatively short predetermined period, for example, the CPU 21 operates so as to increase only the clock cycle of the CPU 21 so as to reduce the predetermined amount of power, and exceeds the predetermined period. May operate so as to reduce the amount of electric power exceeding a predetermined amount, for example, to reduce the luminance of the backlight with the clock period.

(Third embodiment)
In the present embodiment, the presence / absence of interference between the electromagnetic wave for charging and the communication signal via the antenna 4 is detected based on the charging speed that is an index representing the charging state of the battery 80.

  FIG. 7 is a diagram schematically illustrating a functional configuration of the communication terminal 1 according to the third embodiment. The difference between the configurations of FIG. 7 and FIG. 5 is that the interference detection unit 211 includes a charge state detection unit 218 instead of the electric field intensity detection unit 216. Other configurations are the same as those in FIG. The non-volatile storage area of the memory 22 stores the charging threshold 222 and the flag 224 described above.

  The charging threshold 222 indicates the charging speed when there is no interference during the charging period in the normal power mode, that is, the charging amount per unit time. More specifically, an increased voltage value per unit time of the battery voltage that is the remaining amount of the battery 80 is shown.

  FIG. 8 is a process flowchart according to the third embodiment. The difference between the flowchart of FIG. 6 and the flowchart of FIG. 8 is as follows.

  That is, when communication is started, the charging threshold value 222 is read (step S6a), the charging state monitoring unit 110 measures the voltage of the battery 80, outputs the measured voltage value to the CPU 21, and the charging state detection unit 218 inputs it. The amount of increase in the voltage value per unit time is calculated (step S7a). The interference detection unit 211 compares the charging threshold 222 with the calculated increased voltage value, and determines whether or not the condition (increased voltage value ≦ charging threshold) is satisfied based on the comparison result (step S11a). If it is determined that the condition is not satisfied, that is, while it is determined that the voltage of the battery 80 is rising smoothly due to charging (NO in step S12), if the communication is in progress (NO in step S12), The process of calculating the amount of increase in voltage of the battery 80 and the determination process of the satisfaction of the condition in step S11a are repeated, but if it is determined that the communication has ended (YES in step S12), the series of processes ends.

  On the other hand, if it is determined that the condition (increased voltage value ≦ charge threshold) is satisfied (YES in step S11a), a charge stop command is transmitted from the communication terminal 1 to the charger 2 (step S13).

Other processes in FIG. 8 are the same as those in FIG. 6, and description thereof will not be repeated.
Here, it is assumed that the amount of discharge of the battery 80 in the normal power mode (the amount of power supplied to each unit, etc.) is constant, and the voltage of the battery 80 is used as a charging index representing the state of charge for determining interference. The method is not limited to this. For example, the current value (voltage value) of the charging side terminal of the battery 80 may be detected as a charging index, and it may be determined that there is interference if the value is lower than a predetermined value.

(Fourth embodiment)
In the present embodiment, the presence or absence of interference between the electromagnetic wave for charging and the communication signal via the antenna 4 is detected based on the quality of the received signal via the antenna 4.

  FIG. 9 is a diagram schematically illustrating a functional configuration of the communication terminal 1 according to the fourth embodiment. The difference between the configurations of FIG. 9 and FIG. 5 is that the interference detection unit 211 includes a communication quality detection unit 217 instead of the electric field strength detection unit 216. Other configurations are the same as those in FIG. The non-volatile storage area of the memory 22 stores the quality threshold value 223 and the flag 224 described above.

  The quality threshold value 223 is a value indicating communication quality based on a received signal via the antenna 4 when charging is not performed. Specifically, when the received signal processing unit 50 decodes the code represented by the received signal, the received signal processing unit 50 corrects the error of the code according to a predetermined procedure and detects the bit error rate that is the error occurrence rate. In this embodiment, a bit error rate is used as an index representing communication quality. Therefore, it can be said that the bit error rate related to the received signal through the antenna 4 when charging is not performed is mainly due to noise inherent in the communication channel until the antenna 4 receives the signal.

  FIG. 10 is a process flowchart according to the fourth embodiment. The difference between the flowchart of FIG. 8 and the flowchart of FIG. 10 is as follows.

  That is, in FIG. 10, when communication is started, the quality threshold value 223 is read (step S6b), the reception signal processing unit 50 detects the bit error rate (step S7b), and the communication quality detection unit 217 detects the detected communication quality. The bit error rate, which is an index indicating the above, is compared with the quality threshold 223, and it is determined whether or not the condition (communication quality ≦ quality threshold) is satisfied based on the comparison result (step S11b). If it is determined that the condition is not satisfied, that is, while it is determined that the bit error rate does not impair communication quality (NO in step S12), the bit error rate detection processing in step S7b In step S11b, the condition establishment determination process is repeated. If it is determined that the communication is terminated (YES in step S12), the series of processes ends.

  On the other hand, if it is determined that the condition (communication quality ≦ quality threshold) is satisfied (YES in step S11b), a charge stop command is transmitted from the communication terminal 1 to the charger 2 (step S13).

Other processes in FIG. 10 are the same as those in FIG. 8, and description thereof will not be repeated.
Here, the presence or absence of interference is determined based on the bit error rate of the received signal as the communication quality, but the communication quality to be used is not limited to the bit error rate. For example, the communication speed may be used instead of the bit error rate. That is, when data is transmitted from the base station 3 to the antenna 4, the communication speed indicates the number of bits that can be transferred per second. Therefore, the received signal processing unit 50 calculates the number of bits of data received per second and outputs it to the processor 20. The communication quality detection unit 217 may compare a predetermined communication speed (predetermined number of bits) with the calculated number of bits, and determine that there is interference due to charging if it is smaller than the predetermined number of bits based on the comparison result.

  In each embodiment, the threshold value stored in the memory 22 refers to a value acquired in advance through experiments or the like.

(Modification)
The communication terminal 1 is equipped with all the configurations according to the respective embodiments, has a function of determining the presence / absence of interference according to each embodiment according to each flowchart, and provides four interference presence / absence determination results according to the four embodiments. It may be used to determine whether or not interference finally occurs.

  For example, the communication terminal 1 has a GPS (Global positioning system) function for detecting a current position (not shown), and the current position of the communication terminal 1 is a boundary position between the communication area and the outside of the service area, or a position close to the outside of the service area. When it is determined that there is an interference, the presence / absence of interference may be determined using the indicator value of the state of charge without using the electric field strength and communication quality of the received signal.

(Fifth embodiment)
In each of the above-described embodiments, the program according to the flowchart is stored in the memory 22 in advance, and the processing is realized by the CPU 21 reading the program from the memory 22 and executing the instructions of the program.

  The processing method in each embodiment can also be provided as a program. Such a program is a memory medium 15 (card-shaped memory) attached to the communication terminal 1 and can be recorded on a recording medium readable by the CPU 21 and provided to the communication terminal 1 as a program product. The memory medium 15 is a CD (Compact Disc) -ROM, ROM, RAM, or the like. Alternatively, the program can be provided by being received by the antenna 4 via a network and downloaded to a predetermined storage area of the memory 22.

  The provided program product is installed in a program storage unit such as the memory 22 and is read and executed by the CPU 20. The program product includes the program itself and a recording medium on which the program is recorded.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Communication terminal, 2 Charger, 3 Base station, 4 Antenna, 211 Interference detection part, 212 Feed control part, 214 Operation mode control part, 216 Electric field strength detection part, 217 Communication quality detection part, 218 Charge state detection part, 221 Strength threshold, 222 charging threshold, 223 quality threshold, 224 flag.

Claims (9)

A communication terminal,
A circuit unit including a communication circuit connected to a communication line and a circuit different from the communication circuit;
A communication control unit for controlling the communication circuit;
A secondary battery,
A power supply unit for supplying power from the secondary battery to the circuit unit;
A charge control unit for controlling the charging of the secondary battery that by the non-contact using an electromagnetic wave from the charger,
An operation mode control unit for controlling an operation mode of the different circuit;
An interference detector for detecting whether the electromagnetic wave and the communication signal interfere with each other,
When it is detected that the interfering, the operation mode control unit, you outputs an instruction for switching to the power saving mode, such as power consumption is reduced the operating mode to the different circuits, communication terminals . The interference detection unit
The communication terminal according to claim 1, wherein when the intensity of the communication signal decreases to a predetermined threshold value, interference is detected. The interference detection unit
Detecting an index value representing a state of charge of the secondary battery by the charger;
The communication terminal according to claim 1, wherein when the detected index value decreases to a predetermined value, it is detected that there is interference. The interference detection unit
The communication terminal according to claim 1, wherein interference is detected when a value representing communication quality based on the communication signal decreases to a predetermined value. A transmission circuit for transmitting a command to the charger;
When it is detected that there is interference, the charge control unit transmits a command for reducing the magnetic flux density of the electromagnetic wave to the charger via the transmission circuit. The communication terminal described. A method for controlling charging of a secondary battery of a communication terminal using electromagnetic waves from a charger ,
The communication terminal is
A circuit unit including a communication circuit connected to a communication line and a circuit different from the communication circuit;
A power supply unit for supplying power from the secondary battery to the circuit unit,
The method for controlling the charging includes:
Detecting whether the electromagnetic wave and a communication signal interfere with each other;
When it is detected that the interfering, and a step of outputting an instruction for switching to the power saving mode, such as power consumption operation mode of the different circuit can be reduced to the different circuits, the charge How to control. The method for controlling the charging further includes:
The method for controlling charging according to claim 6, comprising the step of transmitting, to the charger, a command for reducing the magnetic flux density of the electromagnetic wave when it is detected that interference is present. A program for causing a processor to execute the method for controlling charging according to claim 6 or 7 . A machine-readable recording medium on which the program according to claim 8 is recorded.

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