JP2008206297A - Portable terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable ensuring the reliability of data communication in non-contact communication without deteriorating the characteristics of non-contact point power transmission, without imposing bad effect on the communication performance of a portable terminal and without requiring expensive countermeasures against noises. <P>SOLUTION: The portable telephone terminal includes a secondary coil 14 and a non-contact point power transmission circuit unit 40 for non-contact point power transmission, and a non-contact communication circuit 70 and a loop antenna 71 for non-contact communication. When non-contact communication is performed, the non-contact communication circuit 70 notifies a control circuit 50 of the non-contact point power transmission circuit unit 40 that the non-contact communication will be performed. Upon receiving the notification, the control circuit 50 requests a cradle 1 on a primary side of the non-contact point power transmission to stop power transmission. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention has a function of receiving power transmitted by contactless power transmission using electromagnetic induction and charging the built-in secondary battery, for example, so-called RFID (Radio Frequency-Identification) The present invention relates to a portable terminal equipped with at least a contactless communication function such as a contactless IC card.

  Conventionally, a power transmission device (for example, a cradle) is used for charging power for charging a secondary battery built in a mobile device such as a mobile phone terminal by using electromagnetic induction by a coil without using an electrical contact. Such a system is known that transmits data from. Hereinafter, power transmission performed without using an electrical contact by using electromagnetic induction is referred to as “contactless power transmission”. According to this non-contact power transmission system, the cradle that is a power transmission device includes a primary side coil and a control circuit unit that performs power transmission control, while the power-receiving-side portable device performs power reception control with the secondary side coil. A circuit part is provided.

  On the other hand, recent mobile phone terminals are equipped with a function for performing data communication without using electrical contacts, such as so-called RFID (Radio Frequency-Identification) and non-contact type IC cards. What is done is becoming more common. Hereinafter, data communication performed without using an electrical contact such as the RFID or the non-contact type IC card is referred to as “non-contact communication”. In the non-contact communication, data communication is performed by receiving a radio wave transmitted from the loop antenna of the transmission side device with the loop antenna of the reception side device. Examples of the transmission side device include a non-contact communication reader / writer provided in an automatic ticket gate at a station and a non-contact communication reader / writer provided in a cash register of a store. In addition, recently, a non-contact communication reader / writer is being incorporated into the mobile terminal itself.

  In Japanese Patent Laid-Open No. 11-122146 (Patent Document 1), in a reader / writer that performs power transmission with a power transmission antenna and performs information communication with an information communication antenna, the power transmission antenna and the information are disclosed. By arranging the antennas for communication in the same plane and by arranging both antennas so that the axes of the coils constituting these antennas are orthogonal to each other, interference due to electromagnetic coupling between these antennas can be prevented, and Divide the coil that constitutes the information communication antenna into a plurality of segments and arrange the voltage induced in some segments and the voltage induced in other segments by the magnetic flux of external noise Therefore, efficient power transmission can be achieved by reducing the overall influence of the information communication antenna from the magnetic flux of external noise. Discloses that a feasible and high-quality information communication.

  Japanese Laid-Open Patent Publication No. 5-114055 (Patent Document 2) includes a first coupler and a second coupler, and a third coupler for energy transmission and a fourth coupler for signal transmission. A signal transmitted from the fourth coupler is obtained by receiving the output transmitted from the third coupler by the first coupler and receiving the operating energy. In the non-contact type receiving device that receives data from the output device by receiving the second coupler, the position is not directly coupled to the third and fourth couplers when inserted into the output device, The fifth coupler is provided in such a relationship that the coupling strength receiving the energy with the third coupler is substantially equal to the coupling strength receiving the energy between the third coupler and the second coupler. The second coupler generates a second signal corresponding to the energy received by the coupler. By combining the input signal received by the second coupler with a polarity that cancels the input signal component according to the energy received from the power, the influence of the energy transmission coupler on the signal transmission coupler is removed, and the data A contactless data receiving apparatus that can efficiently perform transmission is disclosed.

JP-A-11-122146 (FIG. 3) Japanese Patent Laid-Open No. 5-114055 (FIG. 1)

  By the way, when the mobile phone terminal has both the contactless power transmission function and the contactless communication function described above, for example, when the mobile phone terminal is charged in the cradle and charged by contactless power transmission. A case where the mobile phone terminal performs data communication by non-contact communication with another mobile terminal or the like can be considered.

  Here, in the non-contact power transmission, power is transmitted using the resonance by the capacitance C and the inductance L, and the resonance frequency is, for example, about 100 kHz (kilohertz) to about 300 kHz. On the other hand, in the case of non-contact communication, since the use frequency band is about 13 MHz (megahertz), even if the non-contact power transmission and the non-contact communication are performed at the same time, basically both of them are used. There is no influence between them.

  However, in the case of contactless power transmission, harmonic noise is generated from the coil and the control circuit part due to switching operation, etc., and the harmonic noise affects the frequency band used for the non-contact communication. There is a risk that the reliability of contactless communication will be impaired.

  As a countermeasure against such harmonic noise, for example, a circuit element having a capacitance C or an inductance L for minimizing the generation of noise components affecting the frequency band used for non-contact communication is separately supplied to a coil or a circuit unit. For example, the contactless power transmission circuit unit is covered with a noise-blocking seed to suppress noise emission from the contactless power transmission circuit unit to the outside, or for contactless communication It is conceivable to take a technique such as covering the circuit part with a noise-blocking seed to prevent noise from entering the non-contact communication circuit part.

  However, separately adding a circuit configuration of the capacitance C and the inductance L may cause deterioration in characteristics of contactless power transmission. In addition, the provision of the noise blocking sheet not only causes an increase in cost but may also adversely affect the communication performance of the mobile phone terminal.

  The present invention has been proposed in view of such circumstances, and in the case where the mobile terminal has both a contactless power transmission function and a contactless communication function, the characteristics of the contactless power transmission are deteriorated. To provide a portable terminal capable of ensuring the reliability of data communication particularly during non-contact communication without adversely affecting the communication performance of the portable terminal and without requiring expensive noise countermeasures. Objective.

  The mobile terminal according to the present invention performs at least information communication with a secondary side coil for performing power transmission using electromagnetic induction with a primary side coil included in a primary side device of contactless power transmission, and non-contact information communication. A portable terminal having a non-contact communication antenna for performing information communication between a first information communication unit for performing information communication with a primary device and another terminal through a non-contact communication antenna A second information communication unit for performing communication between the other terminal and the second information communication unit prior to starting information communication with the other terminal through the non-contact communication antenna. The first information communication unit notifies the first information communication unit that the contact communication is started, and the first information communication unit performs contactless power transmission to the primary side device based on the notification from the second information communication unit. The problem described above by sending information requesting execution stop Resolve.

  That is, according to the present invention, when non-contact communication is performed, before the non-contact communication is started, the execution of the non-contact power transmission is stopped, so that the harmonic due to the execution of the non-contact power transmission is stopped. The generation of noise is eliminated.

  According to the present invention, when the portable terminal has both the contactless power transmission function and the contactless communication function, when contactless communication is performed, the contactless power before the contactless communication is started. By stopping transmission, the characteristics of contactless power transmission are not deteriorated, the communication performance of the mobile terminal is not adversely affected, and no expensive noise countermeasures are required. It is possible to ensure the reliability of data communication.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  In this embodiment, as an example of the portable terminal of the present invention, a planar coil having a linear conductor or conductor pattern formed in a spiral shape is provided as a secondary coil for contactless power transmission, and the primary side of the present invention. A non-contact power transmission function that receives power transmitted from the primary side coil of the cradle, which is a device, through the secondary side coil and charges the built-in battery, and the like, such as an RFID or a non-contact type IC card Although a mobile phone terminal provided with a non-contact communication function is mentioned, of course, the content described here is merely an example, and it goes without saying that the present invention is not limited to this example. Note that the mobile phone terminal of the present embodiment also has the function of the non-contact communication reader / writer.

[Schematic configuration of mobile phone terminal and cradle and basic operation during charging]
FIG. 1 shows a schematic structure of a main part related to contactless power transmission performed between the mobile phone terminal 2 and the cradle 1 according to the embodiment of the present invention.

  The cellular phone terminal 2 of the present embodiment is, for example, a so-called folding type cellular phone terminal in which the first casing 2A and the second casing 2B can be folded via a hinge 2C.

  The second casing 2B is a secondary that is at least a battery 16 that is a secondary battery that generates operating power of the terminal, and a non-contact power transmission coil that is a power receiving side when the battery 16 is charged. A side coil 14 and a circuit board 15 on which various electronic circuits including a charging control circuit for supplying and charging the power received through the secondary side coil 14 to the battery 16 are mounted inside the casing. I have. Further, in the mobile phone terminal 2 of the present embodiment, the secondary side coil 14 has a housing that becomes an outer side when the mobile phone terminal 2 is folded among the housing surfaces constituting the second housing 2B. It is assumed that it is arranged near the body surface side.

  The first casing 2A includes at least a loop antenna 71 used for non-contact communication and a circuit board 17 including a non-contact communication circuit for performing signal processing and control of the non-contact communication. Provided inside. Further, in the mobile phone terminal 2 of the present embodiment, the non-contact communication loop antenna 71 is located on the outer side when the mobile phone terminal 2 is folded out of each case surface constituting the first case 2A. Suppose that it is arranged near the housing surface side.

  In the present embodiment, illustration and description of other components included in a general mobile phone terminal are omitted.

  The battery 16 is detachable. Accordingly, the mobile phone terminal 2 is provided with a battery lid 13 that is opened and closed (or attached / detached) when the battery 16 is attached / detached.

  The secondary coil 14 is a planar coil in which a conductive linear conductor or conductive pattern is formed in a spiral shape, and one planar portion of the secondary coil 14 is connected to the battery lid 13. For example, it is affixed on the inner wall surface or the outer surface of the battery 16 on the battery lid side. In the present embodiment, it is assumed that the secondary coil 14 is attached to the inner wall surface of the battery lid 13.

  On the other hand, the cradle 1 of the present embodiment includes at least a primary side coil 10 that is a contactless power transmission coil on the power transmission side when charging the battery 16 of the mobile phone terminal 2, and power supply to the primary side coil 10. And a control board portion 11 for controlling the power supply, and a power cord 12 connected to, for example, a household power source. In addition, in this embodiment, illustration and description of other components provided in a general cradle are omitted.

  The primary side coil 10 of the cradle 1 is a planar coil in which a conductive linear conductor or conductive pattern is formed in a spiral shape, just like the secondary side coil 14 of the mobile phone terminal 2. One flat portion of the primary coil 10 is affixed to the inner wall surface of the casing of a flat terminal mounting table provided in the cradle 1 and having a certain size.

  The control board unit 11 is configured such that the mobile phone terminal 2 is placed on the terminal mounting base of the cradle 1 and the secondary coil 14 of the mobile phone terminal 2 and the primary coil 10 of the cradle 1 are arranged close to each other. When the state of the magnetic field in the primary coil 10 changes, it is possible to detect voltage fluctuations corresponding to the change in the state of the magnetic field. In the control board unit 11, the voltage value due to the voltage fluctuation according to the change in the state of the magnetic field in the primary side coil 10 when the secondary side coil 14 is arranged close to the predetermined value becomes a predetermined voltage value. When this is detected, it is determined that the mobile phone terminal 2 is placed on the terminal mounting table of the cradle 1.

  Similarly, in the charging control circuit of the mobile phone terminal 2 according to the present embodiment, the terminal is placed on the terminal mounting table of the cradle 1, and the secondary coil 14 and the primary coil 10 of the cradle 1 are arranged close to each other. Thus, when a change occurs in the state of the magnetic field in the secondary coil 14, voltage fluctuations corresponding to the change in the magnetic field state can be detected. Then, the charge control circuit of the mobile phone terminal 2 is configured such that the voltage value due to the voltage fluctuation corresponding to the change in the state of the magnetic field in the secondary side coil 14 when the primary side coil 10 is disposed in close proximity is a predetermined voltage. When it is detected that the value is reached, it is determined that the own terminal is placed on the terminal mounting table of the cradle 1.

  In the present embodiment, the voltage value generated from the secondary coil 14 when the mobile phone terminal 2 is brought close to the terminal mounting table of the cradle 1 is compared with a predetermined reference voltage value. Based on the result, whether or not the center position of the secondary coil 14 of the mobile phone terminal 2 substantially coincides with the center position of the primary coil 10 of the cradle 1, that is, on the terminal mounting table of the cradle 1 during charging. Whether or not the mobile phone terminal 2 is within the optimum position range can be notified to the user by outputting sound, displaying an image, or the like.

  In the present embodiment, the cradle 1 and the mobile phone terminal 2 can transmit information via the primary side coil 10 and the secondary side coil 14. For example, when the mobile phone terminal 2 is placed on the terminal mounting table of the cradle 1 and detects the close arrangement of the primary side coil 10 and the secondary side coil 14 based on the change in the state of the magnetic field as described above, The cradle 1 and the mobile phone terminal 2 exchange identification information for authenticating the other party by transmitting information via the primary side coil 10 and the secondary side coil 14.

  In the present embodiment, the cradle 1 and the mobile phone terminal 2 both detect that the primary coil 10 and the secondary coil 14 are disposed close to each other, and the cradle 1 and the mobile phone terminal 2 further each other. When the other party can be authenticated, power is transmitted from the cradle 1, and the battery 16 of the mobile phone terminal 2 is charged by the transmitted power.

  Thus, when charging of the battery 16 of the mobile phone terminal 2 is started, the control board unit 11 of the cradle 1 converts the household AC voltage supplied through the power cord 12 into a predetermined DC voltage, An AC voltage having a predetermined frequency is generated using the DC voltage, the generated AC voltage is supplied to the primary side coil 10, and the primary side coil 10 is oscillated at a predetermined resonance frequency.

  On the other hand, on the mobile phone terminal 2 side, when an AC voltage is induced in the secondary coil 14 by the oscillation of the primary coil 10 of the cradle 1, the induced AC voltage is rectified and converted into a DC voltage. The battery 16 is charged with the DC voltage.

  In the present embodiment, the control board unit 11 of the cradle 1 is configured so that the voltage value based on the change in the state of the magnetic field of the primary side coil 10 does not reach a predetermined voltage value or the primary side coil 10. Even if the voltage value based on the change in the state of the magnetic field becomes a predetermined voltage value, if the other party cannot be authenticated by the identification information, the change in the state of the magnetic field of the primary coil 10 may be a metal such as a coin. It is determined that an object or other conductive object is generated by being placed on the terminal mounting table, and control is performed so that power supply to the primary coil 10 is not performed.

  Further, in the present embodiment, when the battery 16 of the mobile phone terminal 2 is charged by power transmission from the cradle 1, the primary coil 10 and the second coil 10 are connected between the cradle 1 and the mobile phone terminal 2. Charging information is transmitted via the secondary coil 14. That is, the charging control circuit of the mobile phone terminal 2 transmits charging information of the battery 16 to the cradle 1 when the battery 16 is being charged by power transmission from the cradle 1. The control board unit 11 of the cradle 1 monitors the charging status of the battery 16 of the terminal 2 based on the charging information transmitted from the mobile phone terminal 2, and indicates that the charging of the battery 16 is not completed. If it is determined by the charging information, the power transmission through the primary coil 10 is continued. On the other hand, if the charging information indicates that the charging of the battery 16 is completed, the power transmission is stopped. . In addition, the control board unit 11 performs control to stop power transmission even when information indicating some abnormality is supplied from the mobile phone terminal 2, for example.

  The information transmission performed between the mobile phone terminal 2 and the cradle 1 may be simple bit communication or coded communication.

  Furthermore, when the mobile phone terminal 2 of the present embodiment brings the loop antenna 71 provided in the first housing 2A close to a reader / writer for non-contact communication, the mobile phone terminal 2 does not contact with the reader / writer. When another mobile terminal that can perform communication and has a non-contact communication function is brought close to the loop antenna 71 of the first housing 2A, the mobile terminal itself can be used as a reader / writer with the other mobile terminal. Non-contact communication can be performed between the two.

[Internal circuit configuration for contactless power transmission between mobile phone terminal and cradle]
FIG. 2 shows a detailed internal circuit configuration of a main part particularly related to contactless power transmission in the mobile phone terminal 2 and the cradle 1 of the embodiment of the present invention.

  2, an internal circuit 20 on the cradle 1 side is included in the control board unit 11 of FIG. 1, and includes a power transmission control unit 22, a power transmission circuit 23, and a primary side coil 10 as main components. It is configured.

  The AC adapter 21 converts household AC voltage supplied through the power cord 12 described above into a predetermined DC voltage. The DC voltage from the AC adapter 21 is supplied to the power transmission circuit 23 via the power transmission control unit 22.

The power transmission circuit 23 includes at least an oscillation circuit, a driver, and a resonance circuit.
For example, the oscillation circuit generates a reference oscillation signal for transmitting charging power from the cradle 1 to the mobile phone terminal 2 and outputs the reference oscillation signal to the driver. The driver converts the DC voltage into an AC voltage having a predetermined frequency using a reference oscillation signal from the oscillation circuit under the control of the control circuit 25 of the power transmission control unit 22. The resonance circuit forms a resonance circuit by the capacitance C of the capacitor and the inductance L of the coil, and resonates according to the AC voltage from the driver. This causes the primary coil 10 to oscillate at a predetermined resonance frequency. The power transmission circuit 23 also performs information transmission to the cellular phone terminal 2 by superimposing the information transmission modulation signal supplied from the control circuit 25 of the power transmission control unit 22 on the AC signal for power transmission.

  A voltage dividing resistor 24 is connected between both coil ends of the primary side coil 10. The voltage dividing resistor 24 is provided to divide a voltage between both coil ends of the primary side coil 10 and send the divided output to the power transmission control unit 22.

  The power transmission control unit 22 includes a control circuit 25, a waveform detector 26, a voltage monitor 27, a temperature detector 28, and the like as main components.

  The waveform detector 26 of the power transmission control unit 22 is supplied with an output obtained by dividing the voltage appearing between both coil ends of the primary coil 10 by the voltage dividing resistor 24. The waveform detector 26 detects the signal waveform of the divided voltage output and outputs the detected waveform signal to the control circuit 25.

  When transmitting the charging power from the cradle 1 to the mobile phone terminal 2 side, the control circuit 25 controls the driver of the power transmission circuit 23, and the AC voltage of the predetermined frequency from the driver to the primary coil 10. To supply.

  Further, the control circuit 25 is based on the detection waveform signal supplied through the voltage dividing resistor 24 and the waveform detector 26, that is, the detection waveform signal of the voltage waveform appearing between both coil ends of the primary coil 10. The mobile phone terminal 2 is judged to approach or leave the terminal mounting table of the cradle 1. That is, the control circuit 25 detects the voltage fluctuation generated in the primary coil 10 due to the approach and detachment of the mobile phone terminal 2 to and from the terminal mounting table by the detected waveform signal through the voltage dividing resistor 24 and the waveform detector 26. . Then, the control circuit 25 controls the supply and stop of the AC voltage from the driver 23 to the primary side coil 10 as necessary based on the detection of the approach and detachment of the mobile phone terminal 2 to the terminal mounting table. Do.

  The control circuit 25 has a modulation / demodulation circuit 29. When transmitting / receiving information to the mobile phone terminal 2, the modem circuit 29 generates a signal modulated according to the information and sends the modulated signal to the power transmission circuit 23. Thereby, information is transmitted to the mobile phone terminal 2 through the primary coil 10. On the other hand, when receiving information from the mobile phone terminal 2, the control circuit 25 has transmitted from the detected waveform signal supplied from the voltage dividing resistor 24 and the waveform detector 26 from the mobile phone terminal 2 side. The modulation signal is extracted. The modulation / demodulation circuit 29 demodulates the modulated signal. Thereby, the information transmitted from the mobile phone terminal 2 is received.

  The voltage monitor 27 monitors, for example, whether or not an abnormal voltage outside the specification is generated in the primary side coil 10 or its occurrence is predicted based on the voltage value from the voltage dividing resistor 24. When the voltage monitor 27 detects or predicts the occurrence of an abnormal voltage that is not specified, the voltage monitor 27 sends detection information to that effect to the control circuit 25.

  The temperature detector 28 is, for example, based on a signal from the temperature sensor 30 provided in the vicinity of or inside the primary side coil 10, that the primary side coil 10 has an abnormal temperature that is not specified or an abnormal temperature. Monitor whether is predicted. When the temperature detector 28 detects that the abnormal temperature is outside the specified range or predicts that the abnormal temperature is reached, the temperature detector 28 sends detection information to that effect to the control circuit 25.

  The control circuit 25 is configured to transmit either the abnormal voltage detection information or the abnormal temperature detection information when transmitting charging power from the cradle 1 to the mobile phone terminal 2 side, during transmission, or at other times. If received, control is performed such that the operation of the power transmission circuit 23 is stopped and the supply of power to the primary coil 10 is not stopped or started.

  On the other hand, in FIG. 2, the internal circuit 40 on the mobile phone terminal 2 side is included in the circuit board 15 of FIG. 1. The main components are a voltage dividing resistor 41, a power receiving circuit 42, a power receiving control unit 43, The mobile phone charging circuit 44 and a battery 45 as a secondary battery are included.

  The power reception circuit 42 includes a rectifier circuit and a regulator as a configuration for power reception, and includes a resonance circuit, a driver, an oscillation circuit, and the like of the secondary coil 14 as a configuration for information transmission to the cradle 1. .

  The rectifier circuit of the power receiving circuit 42 converts the output voltage (AC voltage) between both coil ends of the secondary coil 14 into a DC voltage and sends it to the regulator. The regulator converts the DC voltage supplied from the rectifier circuit into a predetermined voltage used in the charging circuit 44 of the mobile phone terminal, and sends it to the power reception control unit 43.

  The voltage dividing resistor 41 is provided between the secondary side coil 14 and the power receiving circuit 42, divides the voltage between both coil ends of the secondary side coil 14, and outputs the divided output to the power receiving control unit 43. Is provided to send to.

  The power reception control unit 43 includes a control circuit 50, a voltage / waveform detector 52, and the like as main components.

  The voltage / waveform detector 52 is supplied with an output obtained by dividing the voltage appearing between both coil ends of the secondary coil 14 by the voltage dividing resistor 41. The voltage / waveform detector 52 detects the signal waveform of the divided voltage output and outputs the detected waveform signal to the control circuit 50. The voltage / waveform detector 52 detects the received voltage from the divided output. This voltage detection signal is sent to the control circuit 50.

  When the battery 45 is charged by the mobile phone charging circuit 44, the control circuit 50 sends the power received by the power receiving circuit 42 to the mobile phone charging circuit 44.

  When the charging power is supplied from the power reception control unit 43, the mobile phone charging circuit 44 sends the charging power to the battery 45 and charges it according to the remaining amount of the battery 45.

  Further, the control circuit 50 is based on the detection waveform signal supplied through the voltage dividing resistor 41 and the voltage / waveform detector 52, that is, the detection waveform signal of the voltage waveform appearing between both coil ends of the secondary coil 14. Then, the mobile terminal 2 judges whether the terminal 2 is approaching or leaving the terminal mounting table of the cradle 1. That is, the control circuit 50 detects the voltage fluctuation generated in the secondary coil 14 due to the approach and detachment of the terminal 2 from the terminal mounting table by the detected waveform signal through the voltage dividing resistor 41 and the voltage / waveform detector 52. Detect. Then, the control circuit 50 controls the supply and stop of the received power to the mobile phone charging circuit 44 as necessary, based on the detection of the approach and detachment of the terminal 2 from the terminal mounting table.

  Further, the control circuit 50 has a modulation / demodulation circuit 53. When transmitting information or the like to the cradle 1, the modem circuit 53 generates a signal modulated according to the information and sends the modulated signal to the power receiving circuit 42. At this time, the oscillation circuit of the power receiving circuit 42 generates a reference oscillation signal for transmitting information from the mobile phone terminal 2 to the cradle 1 and outputs the reference oscillation signal to the driver. The driver oscillates the secondary coil 14 at a predetermined resonance frequency by resonating the resonance circuit using the reference oscillation signal from the oscillation circuit under the control of the control circuit 50 of the power reception control unit 43. Let At the same time, the driver superimposes the modulation signal for information transmission supplied from the control circuit 50 of the power receiving circuit 43 on the reference oscillation signal. Thereby, information transmission to the cradle 1 is performed.

  On the other hand, when receiving information from the cradle 1, the control circuit 50 uses the modulation signal transmitted from the cradle 1 side from the detection waveform signal supplied through the voltage dividing resistor 41 and the voltage / waveform detector 52. Perform extraction. The modulation / demodulation circuit 53 demodulates the modulated signal. As a result, the information transmitted from the cradle 1 is received.

[Relationship between mobile phone terminal coil and loop antenna and cradle]
3 to 5 show an arrangement example of a contactless power transmission coil and a contactless loop antenna mounted on the mobile phone terminal 2, and the mobile phone terminal 2 is a terminal mounting table of the cradle 1. The relationship between each coil and loop antenna when placed on top is shown. In the example of FIG. 3, a folding type terminal is cited as the cellular phone terminal 2 of the present embodiment, and the examples of FIGS. 4 and 5 are straight type cellular phone terminals. In the example of FIG. 4, the cradle 1 has a triangular housing, for example.

  As shown in FIG. 3, when the foldable mobile phone terminal 2 composed of the first casing 2A and the second casing 2B shown in FIG. 1 is placed on the terminal mounting table of the cradle 1, If the mobile phone terminal 2 is placed on the terminal mounting table of the cradle 1 so that the secondary coil 14 of the housing 2B corresponds to the primary coil 10 of the terminal mounting table of the cradle 1, the primary coil 10 The battery of the mobile phone terminal 2 can be charged by non-contact power transmission between the mobile phone terminal 2 and the secondary coil 14. Further, when the mobile phone terminal 2 is placed on the terminal mounting table of the cradle 1, for example, when the mobile phone terminal 2 is opened as shown in FIG. By using the non-contact communication loop antenna 71 of the body 2A, non-contact communication can be performed with other portable terminals.

  As shown in FIG. 4, when the straight type mobile phone terminal 2 is placed on the terminal mounting table of the triangular cradle 1, the secondary coil 14 is in phase with the primary coil 10 of the terminal mounting table of the cradle 1. Correspondingly, if the mobile phone terminal 2 is placed on the terminal mounting table of the cradle 1, the battery of the mobile phone terminal 2 is transmitted by contactless power transmission between the primary coil 10 and the secondary coil 14. Charging becomes possible. In the case of the example of FIG. 4, even when the mobile phone terminal 2 is placed on the terminal mounting table of the cradle 1, the non-contact communication loop antenna 71 of the mobile phone terminal 2 is the terminal of the cradle 1. Since the mobile phone terminal 2 is not hidden by the mounting table, the mobile phone terminal 2 can perform non-contact communication with other mobile terminals using the non-contact communication loop antenna 71.

  On the other hand, as shown in FIG. 5, when the straight type mobile phone terminal 2 is placed on the terminal mounting table of the quadrangular cradle 1 as shown in FIG. 1, the secondary coil 14 is the terminal mounting table of the cradle 1. If the mobile phone terminal 2 is placed on the terminal mounting table of the cradle 1 so as to correspond to the primary side coil 10, contactless power transmission between the primary side coil 10 and the secondary side coil 14 is performed. The mobile phone terminal 2 can be charged by the battery. However, in the example of FIG. 5, when the mobile phone terminal 2 is placed on the terminal mounting table of the cradle 1, the non-contact communication loop antenna 71 of the mobile phone terminal 2 is hidden by the terminal mounting table of the cradle 1. Therefore, the mobile phone terminal 2 cannot perform non-contact communication with other mobile terminals using the non-contact communication loop antenna 71.

  Here, when the mobile phone terminal 2 and the cradle 1 have the relationship as shown in FIG. 3 or FIG. 4 described above, the mobile phone terminal 2 is placed on the terminal mounting table of the cradle 1, that is, no contact point. When performing battery charging by power transmission, there is a possibility that non-contact communication may be simultaneously performed with another portable terminal or the like.

  However, in the case of contactless power transmission, harmonic noise is generated from the coil and the control circuit part due to switching operation, etc., and the harmonic noise affects the frequency band used for the non-contact communication. There is a risk that the reliability of contactless communication will be impaired.

  Hereinafter, with reference to FIGS. 6 to 9, a description will be given of how high-frequency noise due to contactless power transmission adversely affects contactless communication.

  In FIG. 6, when contactless power transmission is performed between the cradle 1 and the mobile phone terminal 2 and contactless communication is performed between the mobile phone terminal 2 and another mobile terminal 3, the contactless power is transmitted. This shows how harmonic noise due to transmission affects non-contact communication.

  In FIG. 6, when non-contact communication is performed between the mobile phone terminal 2 and the other mobile terminal 3, the non-contact communication circuit 70 of the mobile phone terminal 2 communicates with the other mobile terminal 3 through the loop antenna 71. I do.

  FIG. 7 shows a sequence diagram when the mobile phone terminal 2 of FIG. 6 operates as a reader / writer for non-contact communication and performs non-contact communication with another mobile terminal 3.

  In FIG. 7, the mobile phone terminal 2 on the reader / writer side, for example, intermittently transmits a proximity detection signal. When the other mobile terminal 3 receives the proximity detection signal in proximity to the mobile phone terminal 2, it transmits a proximity notification signal (S <b> 11) to the mobile phone terminal 2.

  When the mobile phone terminal 2 receives the proximity notification signal from the other mobile terminal 3 and detects the proximity of the other mobile terminal 3 (S1), the mobile phone terminal 2 transmits power for non-contact communication to the other mobile terminal 3 (S2). On the other hand, the other portable terminal 3 receives the power for non-contact communication (S12).

  Next, the mobile phone terminal 2 and the other mobile terminal 3 mutually authenticate each other (S3, S13). If it is determined that non-contact communication is possible by the mutual authentication, data communication (S4, S4) S14) is performed.

  Here, when non-contact power transmission is performed between the cradle 1 and the mobile phone terminal 2, the AC adapter 21 of the cradle 21, a circuit unit for non-contact power transmission (for example, the above-described internal circuit 20), the primary coil 10. In addition, harmonic noise is generated from the secondary coil 14, the contactless power transmission circuit unit of the mobile phone terminal 2 (for example, the internal circuit 40 described above), and the like. These harmonic noises adversely affect the non-contact communication.

  FIG. 8 shows an example of a transmission waveform during contactless power transmission and a measurement waveform of harmonic noise (radiation noise) generated from the charging circuit of the mobile phone terminal during the contactless power transmission. FIG. 9 shows an example of a transmission waveform during contactless power transmission and a measurement waveform of harmonic noise (radiation noise) generated from the primary coil of the cradle 1 during the contactless power transmission. 8 and 9, the waveform indicated by the solid line in the figure indicates the transmission waveform during contactless power transmission, and the waveform indicated by the dotted line in the figure indicates the measurement waveform of the radiation noise. As can be seen from FIG. 8 and FIG. 9, it can be seen that large radiation noise is generated in a certain frequency band (for example, 10 MHz to 100 MHz) during contactless power transmission, and these radiation noises adversely affect non-contact communication. The reliability of the non-contact communication will be impaired.

[Examples of measures to eliminate the effect of contactless power transmission on contactless communication]
As described above, in the embodiment of the present invention, when the mobile phone terminal 2 is placed on the terminal mounting table of the cradle 1 and the mobile phone terminal 2 can be contactlessly charged, the mobile phone In the case where non-contact communication is performed with the other portable terminal 3 in proximity to the terminal 2, the measures described below are taken to ensure the reliability of the non-contact communication.

  FIG. 10 shows the reliability of contactless communication between the mobile phone terminal 2 and the other mobile terminal 3 when the mobile phone terminal 2 is placed on the cradle 1 and contactless charging is possible. A schematic configuration of the mobile phone terminal 2 of the present embodiment, the cradle 1, and the other mobile terminal 3 that are made possible is shown. FIG. 11 shows the case where contactless power transmission is performed between the mobile phone terminal 2 and the cradle 1 of FIG. 10, and the case where the mobile phone terminal 2 operates as a reader / writer for non-contact communication and The sequence diagram in the case of performing non-contact communication between is shown.

  10 and 11, when the mobile phone terminal 2 is placed on the terminal mounting table of the cradle 1 and the battery of the mobile phone terminal 2 is charged, the charging power is transmitted from the cradle 1. In step S21, the mobile phone terminal 2 receives the charging power (S31) and charges the battery under the control of the control circuit 50.

  Here, the cellular phone terminal 2 on the reader / writer side is, for example, intermittently transmitting a proximity detection signal from the loop antenna 71 as a control source by the non-contact communication circuit 70. When the other mobile terminal 3 receives the proximity detection signal in proximity to the mobile phone terminal 2, it transmits a proximity notification signal (S <b> 51) to the mobile phone terminal 2.

  When the non-contact communication circuit 70 of the mobile phone terminal 2 receives the proximity notification signal from the other mobile terminal 3 and detects the proximity of the other mobile terminal 3 (S41), the non-contact communication circuit 70 does not contact the mobile terminal 3 The communication power is transmitted (S42). On the other hand, the portable terminal 3 receives the power for contactless communication (S52).

  Further, the non-contact communication circuit 70 of the mobile phone terminal 2 detects the proximity of the other mobile terminal 3 (S41) and performs non-contact communication power transmission (S42). 50 is notified (S43) indicating that non-contact communication is started.

  The control circuit 50 that has received the non-contact communication start notification (S43) from the non-contact communication circuit 70 transmits a signal requesting the cradle 1 to stop the non-contact power transmission (S32). The cradle 1 that has received the stop request signal stops contactless power transmission (S22).

  The non-contact communication circuit 70 notifies the control circuit 50 (S43), and then authenticates the other party with the other portable terminal 3 (S44, S53). If it is determined that non-contact communication is possible, the data communication (S45, S44) is performed.

  Thereafter, when the data communication by the non-contact communication with the other mobile terminal 3 is completed (S46), the non-contact communication circuit 70 of the mobile phone terminal 2 communicates with the control circuit 50 for the non-contact power transmission. A notification (S46) indicating that has ended.

  Upon receiving the non-contact communication end notification (S46) from the non-contact communication circuit 70, the control circuit 50 transmits a signal requesting resumption of non-contact power transmission to the cradle 1 (S33). The cradle 1 that has received the restart request signal restarts contactless power transmission (S13). Note that the contactless power transmission restart condition is satisfied after satisfying various conditions (battery voltage, temperature, etc.) managed by the charging circuit 44 in the circuit unit of the mobile phone terminal 2.

  Thus, charging power is transmitted from the cradle 1 (S24), and the mobile phone terminal 2 receives the charging power (S34) and charges the battery under the control of the control circuit 50.

  Note that the transmission of the signal for requesting the resumption of the non-contact power transmission (S33) may be performed immediately after the end of the data communication by the non-contact communication (S46). The termination may also be caused by the loop antenna 71 not receiving a signal due to, for example, the user temporarily deliberately releasing the other mobile terminal 3 or the communication state of non-contact communication temporarily worsening. Therefore, after receiving the end of the data communication by the non-contact communication (S46), after waiting for a certain time, the transmission of the signal requesting the resumption of the non-contact power transmission (S33) is performed. It is also possible to avoid the situation where contactless power transmission is being performed when contactless communication is resumed due to elimination of general communication interruption or deterioration of communication status A.

  As described above, according to the present embodiment, even when the mobile phone terminal 2 is placed on the cradle 1 and contactless charging is performed, the mobile phone terminal 2 and the other mobile terminal 3 are not connected. When contactless communication is started, contactless power transmission is temporarily interrupted, so that harmonic noise due to contactless power transmission is eliminated, thereby ensuring the reliability of contactless communication. Yes. In particular, in this embodiment, contactless power transmission is stopped before communication that requires reliability of communication information itself, such as mutual authentication of non-contact communication and data communication, is actually performed. Thus, it is possible to reliably ensure the reliability of communication information during mutual authentication and data communication.

  10 and 11, in the cellular phone terminal 2, the contactless communication circuit 70 directly notifies the contactless power transmission control circuit 50 of the start of contactless communication (S43) or contactlessness. Although the case where notification (S46) indicating the end of communication is performed has been described, for example, as shown in FIG. A notification indicating the start or end of non-contact communication from 70 may be sent, and the CPU 61 may notify the control circuit 50 for contactless power transmission of these notifications.

  Here, when the notification from the non-contact communication circuit 70 is sent to the control circuit 50 for contactless power transmission via the CPU 61, the CPU 61 recognizes the current operation state of the mobile phone terminal 2. Therefore, it becomes possible to perform optimal control for the operating state. That is, for example, when the remaining amount of the battery is very low and the mobile phone terminal 2 is in an operating state where the power supply itself is turned off when charging is temporarily stopped, by controlling each part through the CPU 61, For example, user interface control that notifies the user of a message such as “Please end contactless communication once” by displaying on the display, so that contactless charging is prioritized so that contactless communication is not performed. Control, for example, control that prevents the control circuit 50 from sending a non-contact power transmission stop request to the cradle 1 by not sending the notification from the non-contact communication circuit 70 to the control circuit 50, etc. Is possible. Of course, even when non-contact power transmission is interrupted and non-contact communication is performed, by controlling each unit through the CPU 61, for example, a message indicating that charging is stopped or stopped, or non-contact communication is performed. It is possible to perform control such as notifying the user of a message to be displayed, a message to indicate that charging has been resumed, and the like.

  On the other hand, in the case where the non-contact communication circuit 70 directly notifies the control circuit 50 as in the example of FIG. 10 and FIG. For example, the CPU 61 can immediately stop or restart the non-contact power transmission, and therefore, for example, the CPU 61 is performing other complicated processes and requests to stop or restart the non-contact power transmission. There is no possibility of a situation where the timing of sending the cradle to the cradle 1 is delayed.

  In the above-described example, the case where non-contact communication is about to start when non-contact power transmission is performed is described. However, the present invention does not include, for example, when non-contact communication is already performed. It is also applicable when contact power transmission is about to start. That is, in this case, when non-contact communication is already performed, for example, even when the mobile phone terminal 2 is placed on the cradle 1, the non-contact power transmission is not started, and no non-contact communication is performed after the non-contact communication is completed. Control to start contact power transmission is performed.

  In the above example, the mobile phone terminal 2 is on the reader / writer side for non-contact communication. However, the present invention can also be applied to the case where the other mobile terminal 3 is on the reader / writer side. In other words, in this case, the mobile phone terminal 2 is in the case where non-contact communication is started with the other mobile terminal 3 on the reader / writer side when contactless power transmission is being performed with the cradle 1. Therefore, the cradle 1 is requested to stop the contactless power transmission. Of course, in the case of this example as well, for example, when non-contact communication has already been performed, contactless power transmission is not started.

[Summary]
As described above, according to each embodiment of the present invention, when data transmission / reception is performed by non-contact communication while charging the battery of the mobile phone terminal 2 by contactless power transmission, Prior to the start of non-contact communication, the non-contact power transmission is temporarily interrupted so that high frequency noise caused by the non-contact power transmission does not adversely affect the non-contact communication. As a result, according to the present embodiment, it is possible to reliably ensure the reliability of non-contact communication without taking expensive noise countermeasures, and deteriorate the transmission characteristics of contactless power transmission. And the mobile phone terminal communication performance is not adversely affected.

  The description of each embodiment described above is an example of the present invention. Therefore, the present invention is not limited to the above-described embodiments, and various modifications can be made according to the design and the like as long as they do not depart from the technical idea according to the present invention. .

  In the above-described embodiment, the case where non-contact communication is performed between the mobile phone terminal 2 and the other mobile terminal 3 has been described as an example. However, the present invention is also applicable to the case where the cradle 1 has a function of performing non-contact communication. Is possible.

  In the present embodiment, the mobile phone terminal 2 and its cradle 1 are taken as examples. However, the present invention is not limited to these, and various electronic devices such as PDA (Personal Digital Assistants) and their cradle are also used. Applicable.

It is a figure which shows the schematic internal structure of the principal part of the mobile telephone terminal and cradle of embodiment of this invention. It is a block circuit diagram which shows the detailed internal circuit structure of the principal part relevant to the non-contact electric power transmission of the mobile telephone terminal and cradle of this invention embodiment. Example of arrangement of contactless power transmission coil and non-contact communication loop antenna in mobile phone terminal, and in particular each coil and loop antenna when folding type mobile phone terminal is placed on cradle terminal mounting table It is a figure which shows a relationship. Example of arrangement of non-contact power transmission coil and non-contact communication loop antenna in a mobile phone terminal, and particularly each coil and loop when a straight type mobile phone terminal is placed on a terminal mounting table of a triangular cradle It is a figure which shows the relationship of an antenna. Example of arrangement of contactless power transmission coil and non-contact communication loop antenna in a mobile phone terminal, and especially each coil and loop when a straight type mobile phone terminal is placed on a rectangular cradle terminal mounting table It is a figure which shows the relationship of an antenna. When contactless power transmission is performed between the cradle and the mobile phone terminal and contactless communication is performed between the mobile phone terminal and another mobile terminal, harmonic noise due to contactless power transmission is contactless communication. It is a figure for demonstrating a mode that affects. FIG. 7 is a sequence diagram when the mobile phone terminal of FIG. 6 operates as a reader / writer for non-contact communication and performs non-contact communication with another mobile terminal. It is a wave form diagram which shows an example of the transmission waveform at the time of non-contact power transmission, and the measurement waveform of the harmonic noise (radiation noise) which generate | occur | produces from the charging circuit of a mobile telephone terminal at the time of the said non-contact power transmission. It is a wave form diagram which shows an example of the measurement waveform of the transmission waveform at the time of non-contact power transmission, and the harmonic noise (radiation noise) which generate | occur | produces from the primary coil of the cradle 1 at the time of the said non-contact power transmission. The mobile phone according to the present embodiment that can ensure the reliability of contactless communication between the mobile phone terminal and another mobile terminal when the mobile phone terminal is placed in the cradle and contactless charging is possible. It is a figure which shows schematic structure of a terminal, these cradle, and another portable terminal. When contactless power transmission is performed between the mobile phone terminal of FIG. 10 and the cradle, and when the mobile phone terminal operates as a reader / writer for contactless communication and performs contactless communication with other mobile terminals. It is a sequence diagram. 1 shows a schematic configuration of a mobile phone terminal according to the present embodiment capable of ensuring contactless communication between a mobile phone terminal and another mobile terminal, their cradle, and another mobile terminal, and allows contactless power transmission through a CPU. It is a figure which shows the example in case cancellation and restart are performed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Cradle, 2 Mobile phone terminal, 2A 1st housing | casing, 2B 2nd housing | casing, 2C hinge, 10 Contactless power transmission coil by the side of cradle, 11 Control board part, 12 Power cord, 13 Battery of mobile phone terminal Lid, 14 contactless power transmission coil on the mobile phone terminal side, 15 battery on the mobile phone terminal, 16 circuit board on the mobile phone terminal, 17 circuit board including the non-contact communication circuit, 20 internal circuit on the cradle side, 21 AC adapter, 22 power transmission control unit, 23 power transmission circuit, 24 cradle side voltage dividing resistor, 25 power transmission control unit control circuit, 26 waveform detector, 27 voltage monitor, 28 temperature detector, 29 cradle side modulation / demodulation circuit, 30 temperature sensor 40, internal circuit on the mobile phone terminal side, 41 voltage dividing resistor on the mobile phone terminal side, 42 power receiving circuit, 43 power receiving control unit, 44 Cell phone charging circuit, 45 battery, 50 power reception control unit control circuit, 52 voltage / waveform detector, 53 mobile phone terminal modulation / demodulation circuit, 60 mobile phone circuit unit, 70 non-contact communication circuit, 71 non-contact communication Loop antenna

Claims (6)

A non-contact communication antenna for non-contact information communication and at least a secondary coil for performing power transmission using electromagnetic induction with a primary coil provided in a primary device of non-contact power transmission In a mobile terminal equipped with
A first information communication unit for performing information communication with the primary side device;
A second information communication unit for performing information communication with other terminals through the non-contact communication antenna,
The second information communication unit confirms that the non-contact communication is started with the other terminal before starting the information communication with the other terminal through the non-contact communication antenna. Notify the information and communication department,
The first information communication unit transmits information requesting execution stop of non-contact power transmission to the primary side device based on the notification from the second information communication unit.
A portable terminal characterized by that. Having at least a terminal control unit for determining the state of the own terminal;
The second information communication unit performs, through the terminal control unit, notifying the first information communication unit that non-contact communication is started with the other terminal,
The mobile terminal according to claim 1, wherein the terminal control unit controls whether or not to transmit a notification from the second information communication unit to the first information communication unit based on a state of the terminal itself. Terminal. A user interface unit for notifying a user-recognizable message;
The mobile terminal according to claim 2, wherein the terminal control unit performs control to cause the user interface unit to execute at least a message notification indicating an execution state of the contactless power transmission. The secondary battery is charged with the power supplied from the primary device by the contactless power transmission and generates the operating power of the mobile terminal,
The terminal control unit controls whether or not to transmit a notification from the second information communication unit to the first information communication unit based on a remaining capacity of the secondary battery. The portable terminal described. A user interface unit for notifying a user-recognizable message;
The mobile terminal according to claim 4, wherein the terminal control unit performs control for causing the user interface unit to execute a message notification related to the execution of the non-contact communication based on the remaining capacity of the secondary battery.   The first information communication unit transmits information requesting to stop the execution of contactless power transmission to the primary side device immediately or based on the notification from the second information communication unit. The portable terminal according to claim 1, which is performed after waiting.

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