JPWO2015099065A1 - Non-contact power receiving circuit, non-contact power receiving device, and non-contact power transmitting / receiving device - Google Patents

Abstract

Realization of a non-contact power receiving device including both antennas for communication and non-contact power reception that prevent destruction of communication circuits and reduce interference between antennas. Detecting at least one of a wireless communication unit, a non-contact power receiving unit that receives power wirelessly transmitted from the power transmission side in a non-contact manner, whether or not power reception is being performed, and whether or not communication is being performed, and the result And a detection circuit that outputs at least one resonance frequency switching unit that switches at least one of a resonance frequency of the wireless communication unit and a resonance frequency of the non-contact power reception unit based on an output of the detection circuit. Contact power receiving circuit.

Description

  The present invention relates to a non-contact power receiving apparatus for communication with non-contact power transmission, and in particular, the frequency used for communication and non-contact power transmission is different, and both antennas for communication and non-contact power reception are placed close to each other. It relates to the technology to prepare.

  Recent portable terminals have a communication function of a non-contact type IC card such as FeliCa (registered trademark) and NFC (Near Field Communication) that realize an electronic money function, an electronic settlement function, and the like. On the other hand, wireless power consortium Qi (Chi) has become an international standard for non-contact power transmission, and a non-contact power transmission power supply stand that can be charged simply by placing a mobile terminal on the power supply base has been commercialized. Has been.

  An example of the non-contact power transmission apparatus is disclosed in Patent Document 1, for example. A block diagram of the non-contact power transmission device 1610a described in this document is shown in FIG. The power transmission antenna 1620a is connected to a power reception circuit 1630. The power transmission antenna 1620a includes a resonance antenna 22a that can resonate at a predetermined frequency and accumulate power and a power transfer antenna 24a that extracts power accumulated in the resonance antenna 1622a. Communication antenna 1640 is surrounded by power transmission antenna 1620a. In such an arrangement, the entire contactless power transmission device 1610a can save space, but the coupling coefficient between the power transmission antenna 1620a and the communication antenna 1640 is large. Therefore, when power transmission is performed, current exceeding the current planned by the communication circuit 1660 flows through the communication circuit 1660, so that the communication circuit 1660 needs to be protected. The same applies to the case where the power transmission antenna 1620a is surrounded by the communication antenna 1640, contrary to this embodiment.

  In this conventional example, based on the power level transmitted by the power transmission circuit, the control circuit 1670 controls the cutoff circuit 1650 so as to cut off the communication antenna 1640 and the communication circuit 1660 during power transmission. The control circuit 1670 controls the cutoff circuit 1650 to protect the communication circuit 1660 from the transmitted power, assuming that power transmission has started when the transmitted power level exceeds a predetermined threshold. As a cutoff circuit, it is described that a bandpass filter or a resonance circuit is added to a system from a semiconductor switch, a mechanical switch, or a communication antenna 1640 to a communication circuit 1660 to cut off AC power accompanying power transmission. .

Patent No. 5324008

  An antenna mounted on a non-contact power receiving apparatus is required to reduce an antenna mounting space in order to reduce the size of the non-contact power receiving apparatus. However, when the wireless communication antenna and the non-contact power receiving antenna in the non-contact power receiving apparatus are arranged close to each other, the coupling coefficient between the power transmission antenna and the communication antenna increases, and thus the power is transmitted to the wireless communication antenna of the power receiving apparatus. However, there is a possibility that the wireless communication circuit of the non-contact power receiving apparatus may be broken by receiving a power and flowing a large current through the wireless communication circuit. In addition, since a constant current flows through the non-contact power receiving antenna due to the induced electromotive force during communication, an electromagnetic field is generated from the non-contact power receiving antenna as a reaction to cause interference to the wireless communication antenna. In the case of power transmission, on the contrary, an electromagnetic field generated from the wireless communication antenna causes interference with the non-contact power receiving antenna. When the frequencies used for wireless communication and non-contact power transmission are different, there is a problem that the communication sensitivity and power supply efficiency are deteriorated due to the interference between the antennas.

  Patent Document 1 discloses a method of protecting a wireless communication circuit by blocking between the wireless communication antenna of the non-contact power receiving apparatus and the wireless communication circuit. However, even if it is possible to prevent a large current from flowing into the communication circuit by the interruption circuit, it is difficult to completely prevent the leakage current from flowing. For this reason, interference with the non-contact power receiving antenna due to leakage current flowing through the wireless communication antenna cannot be prevented. In addition, the configuration using the cutoff circuit described in Patent Document 1 does not contribute at all to the problem of interference with the wireless communication antenna by the non-contact power receiving antenna during communication. For this reason, interference between the antennas of the wireless communication antenna and the non-contact power receiving antenna in the non-contact power receiving apparatus remains, and it is not possible to prevent deterioration of communication sensitivity and power supply efficiency due to this.

  The present invention has been made in view of the above problems, and has the following characteristics. That is, the non-contact power receiving circuit of the present invention includes a wireless communication unit, a non-contact power receiving unit that wirelessly receives power wirelessly transmitted from the power transmission side, whether or not power is being received, and whether or not communication is being performed. A detection circuit that detects at least one of the output and outputs the result, and at least switches between a resonance frequency of the wireless communication unit and a resonance frequency of the non-contact power reception unit based on the output of the detection circuit And a single resonance frequency switching unit.

  In the present invention, when the detection circuit does not output the detection result that the non-contact power reception unit is receiving power or when the detection circuit outputs the detection result that the wireless communication unit is communicating, The at least one resonance frequency switching unit switches at least one of a resonance frequency of the non-contact power reception unit and a resonance frequency of the wireless communication unit to a frequency that is used for wireless communication and becomes resonant, and the non-contact power reception unit When the detection circuit outputs a detection result that power is being received or when the detection circuit does not output a detection result that the wireless communication unit is communicating, the resonance frequency switching unit At least one of the resonance frequency of the power receiving unit and the resonance frequency of the wireless communication unit may be switched to a frequency that is used for non-contact power transmission and becomes resonant.

  The at least one resonance frequency switching unit may change at least one of a capacitor capacity, an inductance, a magnetic field, and an electric field of the non-contact power receiving unit or the wireless communication unit based on an output from the detection circuit. It is good also as a structure which switches a resonant frequency by.

  Furthermore, the wireless communication unit of the present invention is connected to at least two signal lines for connecting to a communication circuit that communicates with the counterpart communication device via the wireless communication unit, and the non-contact power receiving circuit further includes the wireless communication unit. A shunt circuit connected between the communication unit and the communication circuit is provided, and the shunt circuit can short-circuit or open the at least two signal lines based on the output of the detection circuit.

  The shunt circuit includes a first switch for short-circuiting or opening between the at least two signal lines, and when the detection circuit outputs a detection result that the non-contact power reception unit is receiving power or the wireless When the detection circuit does not output a detection result that the communication unit is communicating, the shunt circuit turns on the first switch to short-circuit between the at least two signal lines, and the non-contact power reception unit When the detection circuit does not output a detection result indicating that power is being received or when the detection circuit outputs a detection result that the wireless communication unit is communicating, the shunt circuit turns off the first switch. Thus, the connection between the at least two signal lines may be released.

  The at least one resonance frequency switching unit includes a first capacitor connected to the non-contact power receiving unit, a second switch and a second capacitor connected in parallel to the first capacitor, and the at least one resonance frequency switching unit includes: The resonance frequency switching unit turns on the second switch, and supplies the power received by the non-contact power receiving unit and the non-contact power receiving unit via the first capacitor and the second capacitor connected in parallel. And switching the resonance frequency of the non-contact power receiving unit to one of the frequency used for wireless communication and the frequency used for non-contact power transmission, and turning off the second switch The second capacitor is disconnected and the non-contact power receiving unit and the power supply circuit are made conductive through the first capacitor to transmit the frequency and non-contact power transmission used for wireless communication. When the resonance frequency of the non-contact power receiving unit is switched to the other frequency to be used, and the detection circuit does not output a detection result that the non-contact power receiving unit is receiving power, or the wireless communication unit When the detection circuit outputs a detection result that the communication is in progress, the at least one resonance frequency switching unit is used for wireless communication, and the resonance frequency of the non-contact power reception unit is set to a resonance frequency. When the detection circuit outputs a detection result that the non-contact power reception unit is receiving power or when the detection circuit does not output a detection result that the wireless communication unit is communicating, At least one resonance frequency switching unit may switch the resonance frequency of the non-contact power receiving unit so as to be a frequency that is used for non-contact power transmission and becomes resonant.

  Radio using a lower frequency so as to surround a radio communication unit or a non-contact power receiving unit which uses a higher one of a frequency used for radio communication and a frequency used for non-contact power transmission. A communication unit or a non-contact power receiving unit may be arranged.

  The wireless communication unit can be arranged so as to surround the non-contact power receiving unit on the outside.

  The non-contact power receiving unit may be arranged so as to surround the wireless communication unit on the outside.

  The non-contact power receiving circuit further includes a power receiving coil connected to a power supply circuit that supplies electric power received by the non-contact power receiving unit, and the non-contact power receiving unit is a resonance coil and is received by the non-contact power receiving unit. At least one resonance frequency switching unit is not connected to a power supply circuit that supplies power, and the third and fourth capacitors connected to the resonance coil and a third capacitor that opens and closes a connection between the fourth capacitor and the third capacitor. And the third and fourth capacitors are connected in parallel, and the at least one resonance frequency switching unit opens the third switch to disconnect the fourth capacitor, thereby The resonance coil of the non-contact power receiving unit is switched to one of a frequency used for wireless communication and a frequency used for non-contact power transmission, The switch is closed and the resonance coil is conducted through the third capacitor and the fourth capacitor connected in parallel, and the other one of the frequency used for wireless communication and the frequency used for non-contact power transmission is set. The resonance frequency of the non-contact power receiving unit is switched to a frequency, and when the detection circuit does not output a detection result that the non-contact power receiving unit is receiving power, or the wireless communication unit is communicating When the detection circuit outputs a detection result, the at least one resonance frequency switching unit switches the resonance frequency of the non-contact power reception unit so that the resonance frequency is used for wireless communication and becomes a resonance frequency. When the detection circuit outputs the detection result that the unit is receiving power or when the detection circuit does not output the detection result that the wireless communication unit is communicating, Serial resonance frequency switching section is used in non-contact power transmission may be configured to switch the resonance frequency of the non-contact power receiving unit such that the frequency at which resonance.

  The non-contact power reception unit is a resonance coil, and the resonance frequency switching unit is connected to one end of the resonance coil and is connected to a power supply circuit that supplies power received by the non-contact power reception unit. An electric wire, a second feed line connected to the other end of the resonance coil, a third feed line connected between one end and the other end of the resonance coil, and a fourth connected to the power circuit. And a fourth switch for connecting any one of the second and third feed lines to the fourth feed line, and the at least one resonance frequency switching unit includes a second switch The fourth switch is switched so that the feeder line is connected to the fourth feeder line, and the frequency of the contactless power receiving unit is set to one of the frequency used for wireless communication and the frequency used for contactless power transmission. The resonance frequency is switched and the third feeder is connected to the fourth feeder. The fourth switch is switched so that the resonance frequency of the non-contact power receiving unit is switched to the other frequency of the frequency used for wireless communication and the frequency used for non-contact power transmission. When the detection circuit does not output a detection result that the power reception unit is receiving power or when the detection circuit outputs a detection result that the wireless communication unit is communicating, the at least one resonance frequency switching The unit switches the resonance frequency of the non-contact power receiving unit to be a frequency used for wireless communication and becomes resonant, and when the detection circuit outputs a detection result that the non-contact power receiving unit is receiving power or When the detection circuit does not output a detection result that the wireless communication unit is communicating, the at least one resonance frequency switching unit is used for non-contact power transmission and becomes resonant. The such that the frequency may be possible to switch the resonance frequency of the non-contact power receiving unit.

  The at least one resonance frequency switching unit communicates the fifth communication unit connected to the wireless communication unit and the counterpart communication device via the wireless communication unit without using the fifth capacitor. A fifth switch connected to the circuit, wherein the at least one resonance frequency switching unit switches the fifth switch so that the wireless communication unit becomes conductive without passing through a fifth capacitor, thereby performing wireless communication. The resonance frequency of the wireless communication unit is switched to one of the frequency used and the frequency used for non-contact power transmission, and the fifth switch is turned on so that the wireless communication unit becomes conductive through a fifth capacitor. Switching, switching the resonance frequency of the wireless communication unit to the other frequency of the frequency used for wireless communication and the frequency used for non-contact power transmission, When the detection circuit does not output a detection result that the non-contact power receiving unit is receiving power or when the detection circuit outputs a detection result that the wireless communication unit is communicating, the at least one resonance The frequency switching unit switches the resonance frequency of the wireless communication unit to be a resonance frequency used for wireless communication, and the detection circuit outputs a detection result that the non-contact power reception unit is receiving power Alternatively, when the detection circuit does not output a detection result that the wireless communication unit is communicating, the at least one resonance frequency switching unit is used for non-contact power transmission and has a resonance frequency. The resonance frequency of the wireless communication unit may be switched.

  The wireless communication unit is a resonance coil, and the at least one resonance frequency switching unit is connected to a communication circuit connected to one end of the resonance coil and communicating with the counterpart communication device via the wireless communication unit. 1 signal line, a second signal line connected to the other end of the resonance coil, and a sixth capacitor connected in series, and a third signal connected between one end and the other end of the resonance coil A fourth signal line connected to the communication circuit, and a sixth switch for connecting any one of the second signal line and the third signal line to the fourth signal line, At least one resonance frequency switching unit switches the sixth switch so that it is connected to the fourth signal line via the second signal line, and is used for the frequency used for wireless communication and non-contact power transmission Of the radio communication unit to one of the frequencies to be transmitted Switching the oscillation frequency, switching the sixth switch so that it is connected to the fourth signal line via the third signal line, the frequency used for wireless communication and the frequency used for non-contact power transmission When the resonance frequency of the wireless communication unit is switched to the other frequency and the detection circuit does not output a detection result that the non-contact power reception unit is receiving power or the wireless communication unit is communicating When the detection circuit outputs the detection result, the at least one resonance frequency switching unit switches the resonance frequency of the wireless communication unit so that the resonance frequency is used for wireless communication, and the contactless power reception When the detection circuit outputs a detection result that the unit is receiving power or when the detection circuit does not output the detection result that the wireless communication unit is communicating, One of the resonance frequency switching section is used in non-contact power transmission can be switched to a resonance frequency of the wireless communication unit so that the frequency at which resonance.

In a further embodiment of the present invention, the contactless power receiving circuit includes a wireless communication unit, a contactless power receiving unit that receives power wirelessly transmitted from the power transmission side in a contactless manner, whether or not power is being received, and during communication. A detection circuit that detects at least one of whether or not and outputs the result, and a communication circuit that communicates with the counterpart communication device via the wireless communication unit and the wireless communication unit With shunt circuit,
The wireless communication unit is connected to at least two signal lines for connecting to the communication circuit, and the shunt circuit short-circuits or opens between the at least two signal lines based on the output of the detection circuit. Features.

  The shunt circuit includes a first switch for short-circuiting or opening between the at least two signal lines, and when the detection circuit outputs a detection result that the non-contact power reception unit is receiving power or the When the detection circuit does not output a detection result that the wireless communication unit is communicating, the shunt circuit turns on a seventh switch to short-circuit the at least two signal lines, and the non-contact power receiving unit When the detection circuit does not output the detection result that the wireless communication unit is receiving power or when the detection circuit outputs the detection result that the wireless communication unit is communicating, the shunt circuit sets the seventh switch. It can be turned off to open the connection between the at least two signal lines.

  The non-contact power receiving device of the present invention includes the above-described non-contact power receiving circuit, a communication circuit that communicates with the counterpart communication device via a wireless communication unit, and a power supply circuit that supplies power received by the non-contact power receiving unit It is characterized by providing.

  Furthermore, the non-contact power transmission / reception device of the present invention includes the above-described non-contact power reception device and a non-contact power transmission device that transmits power to the non-contact power reception device in a non-contact manner.

  As described above, the present invention switches the resonance frequency of the wireless communication unit and the resonance frequency of the non-contact power reception unit to use the interference between the wireless communication unit and the non-contact power reception unit in reverse, thereby reducing the communication sensitivity. Degradation of power reception efficiency can be prevented. Further, by forming a loop in the wireless communication unit during power reception, it is possible to prevent the communication circuit of the non-contact power receiving apparatus from being broken. Thereby, the mounting space of the wireless communication antenna and the non-contact power receiving antenna in the power receiving device can be reduced, and the power receiving terminal can be downsized.

It is a block diagram of the non-contact power transmission / reception apparatus which concerns on one Embodiment of this invention. 1 is a block diagram of a contactless power receiving device according to a first embodiment of the present invention. 1 is a block diagram of a contactless power receiving device according to a first embodiment of the present invention. 1 is a block diagram of a contactless power receiving device according to a first embodiment of the present invention. It is a block diagram of the non-contact power receiving apparatus which concerns on the 2nd Embodiment of this invention. It is a block diagram of the non-contact power receiving apparatus which concerns on the 3rd Embodiment of this invention. It is a circuit block diagram of the non-contact power receiving apparatus which concerns on Example 1 of this invention. It is sectional drawing of the antenna part in Example 1 of this invention. It is sectional drawing of the antenna part in Example 1 of this invention. It is a circuit block diagram of the non-contact power receiving apparatus which concerns on Example 2 of this invention. It is a circuit block diagram of the non-contact power receiving apparatus which concerns on Example 3 of this invention. It is a circuit block diagram of the non-contact power receiving apparatus which concerns on Example 4 of this invention. It is a circuit block diagram of the non-contact power receiving apparatus which concerns on Example 5 of this invention. It is a circuit block diagram of the non-contact power receiving apparatus which concerns on Example 6 of this invention. It is a circuit block diagram of the non-contact power receiving apparatus which concerns on Example 7 of this invention. It is a circuit block diagram of the non-contact power receiving apparatus which concerns on Example 8 of this invention. It is a block diagram of the non-contact electric power transmission apparatus of a prior art example. It is explanatory drawing explaining operation | movement of this invention. It is explanatory drawing explaining operation | movement of this invention.

  FIG. 1 is a configuration diagram of a non-contact power transmission / reception device 100 according to an embodiment of the present invention. The non-contact power transmission / reception device 100 includes a non-contact power supply stand 110 and a non-contact power reception device 120. The power supply stand 110 wirelessly transmits power using a flat coil or the like. The non-contact power receiving apparatus 120 receives electric power transmitted from the power supply stand 110 using a loop antenna, a coil antenna, or the like. In the present embodiment, the power supply stand 110 can further perform wireless communication with the non-contact power receiving device 120. However, the power supply stand 110 includes only a power supply function, and wireless communication may be performed with other communication devices. Good. The non-contact power receiving device 120 may wirelessly communicate with other communication devices in addition to the power supply stand 110. Typically, the contactless power receiving device 120 may be a portable electric device such as a mobile phone, a smartphone, or a notebook computer, but includes any electric device that can receive power by contactless contact. The power supply stand 110 may be, for example, a charger for a portable device such as a mobile phone or an automatic ticket gate at a station, but may be any device as long as it can wirelessly supply power.

[First Embodiment]
FIG. 2 is a block diagram of the contactless power receiving device according to the first embodiment of the present invention. The contactless power receiving device 120 includes a contactless power receiving circuit 200, a communication circuit 210, and a power supply circuit 220. The non-contact power reception circuit 200 includes an antenna unit 230, and the antenna unit 230 includes a wireless communication antenna 231 that is a wireless communication unit and a non-contact power reception antenna 232 that is a non-contact power reception unit. The non-contact power receiving circuit 200 further includes a detection circuit 240 that detects whether or not power is being received and whether or not communication is being performed, and outputs the result, a resonance frequency switching unit 250 for the wireless communication antenna 231, and a non-contact A resonance frequency switching unit 260 for the power receiving antenna 232 is provided. The frequency used for wireless communication is different from the frequency used for wireless power transmission.

  The communication circuit 210 is a circuit that communicates with the communication apparatus of the other party via the wireless communication antenna 231. For example, a signal transmitted from the communication apparatus of the other party is processed, and an appropriate response process is performed. The power supply circuit 220 receives power received from the non-contact power receiving antenna 232 and performs processing such as rectification, receives power necessary for the non-contact power receiving device 120, and functions as a power source. The received power may be stored in the storage battery.

  The detection circuit 240 is connected to, for example, the output end sides of the wireless communication antenna 231 and the non-contact power receiving antenna 232, and is set in the wireless communication mode at an initial stage and does not output any signal. Then, when the input level from the wireless communication antenna 231 to the communication circuit 210 exceeds a certain threshold value, it is determined that the power is being received, the mode is switched to the non-contact power transmission mode, and the detection result that the power is being received is output. To do. Thereafter, when the input level from the non-contact power receiving antenna 232 to the power supply circuit 220 falls below a certain threshold value, it is determined that the power reception is completed, the wireless communication mode is returned, and the output indicating that the power is being received is stopped.

  In the present invention, the method for detecting whether the non-contact power receiving apparatus is receiving power or communicating is not limited to the above-described configuration. For example, when switching from the wireless communication mode to the non-contact power transmission mode, the input level of the power supply circuit 220 may be examined and switched when a certain threshold value is exceeded. The input level to the communication circuit 210 may also be checked when switching from the non-contact power transmission mode to the wireless communication mode.

  The detection circuit 240 may output a signal indicating that communication is being performed instead of a signal indicating that power is being received. If there is no signal indicating that power is being received from the detection circuit 240 or if there is no signal indicating that communication is being performed, it may be considered that a result indicating that communication is being performed or power is being received is output. When not receiving power or not communicating, a signal that clearly indicates that no power is received or communicated may be issued. Moreover, you may output the signal which specifies both during communication or power receiving. For example, a signal indicating that communication is being performed is output in the wireless communication mode, and a signal indicating that power is being received is output in the non-contact power transmission mode. The signal from the detection circuit 240 may be continuously output while the state is maintained, or may be output only once after the state is changed. In addition, any output may be detected as long as it is an output for determining whether or not power is being received and whether or not communication is being performed.

  Here, the wireless communication antenna 231 and the non-contact power receiving antenna 232 are coil antennas. However, those skilled in the art will appreciate that these may be loop antennas, or any configuration that can receive wireless communication and receive non-contact power.

  The operation of this embodiment will be described below. During wireless communication, a signal is wirelessly transmitted from a communication counterpart device such as a power supply stand. Since the resonance frequency switching unit 250 for the wireless communication antenna 231 does not receive a signal indicating that the power is received from the detection circuit 240, the resonance frequency of the wireless communication antenna 231 is switched to a frequency used for wireless communication. An induced electromotive force is generated by the wireless transmission signal, and the wireless communication antenna 231 resonates at a frequency used for wireless communication. On the other hand, since the resonance frequency switching unit 260 for the non-contact power receiving antenna 232 does not receive an output signal indicating that power is received from the detection circuit 240, the non-contact power receiving antenna 232 resonates at a frequency used for wireless communication. Switches the resonance frequency. The resonance frequency switching units 250 and 260 may switch the resonance frequency to a frequency used for wireless communication when receiving a signal indicating that communication is being performed from the detection circuit 240.

  At the time of non-contact power reception, power is transmitted from the power supply stand 110 by wireless power transmission. The resonance frequency switching unit 250 for the wireless communication antenna 231 receives a signal indicating that power has been received from the detection circuit 240, and switches the resonance frequency of the wireless communication antenna 231 to a frequency used for wireless power transmission. On the other hand, the resonance frequency switching unit 260 for the non-contact power receiving antenna 232 receives an output indicating that power is received from the detection circuit 240 and resonates so that the non-contact power receiving antenna 232 resonates at a frequency used for wireless power transmission. Switch the frequency. The wireless communication antenna 231 and the non-contact power receiving antenna 232 resonate at a frequency used for wireless power transmission. The resonance frequency switching units 250 and 260 may switch the resonance frequency to a frequency used for wireless power transmission when not receiving a signal indicating that communication is being performed from the detection circuit 240.

  By adopting such a configuration, even when the wireless communication antenna and the non-contact power receiving antenna are arranged close to each other so that the wireless communication area and the charging area coincide, the non-contact power receiving antenna is Since it does not resonate at the frequency used for wireless power transmission but resonates at the resonance frequency of wireless communication, interference by the non-contact power receiving antenna is reduced, and communication with little deterioration in sensitivity becomes possible. Further, at the time of non-contact power reception, since the wireless communication antenna does not resonate at the frequency used for wireless communication, but resonates at the frequency used for wireless power transmission, efficient non-contact power reception can be performed. .

  The resonance frequency can be switched by changing the impedance of the wireless communication antenna 231 or the non-contact power receiving antenna 232, for example. The impedance may be changed by changing the capacitance or inductance of a capacitor connected to each of the antennas 231 and 232.

  In the present embodiment, both the wireless antenna and the non-contact power receiving antenna have the resonance frequency switching unit, but it is obvious that only one of them can operate. That is, when the resonance frequency switching unit is connected only to the non-contact power receiving antenna 232, when the detection circuit 240 outputs the detection result that power is being received, the non-contact power receiving antenna 232 is connected. The resonance frequency switching unit 260 switches the resonance frequency of the non-contact power receiving antenna to a frequency used for wireless power transmission, and otherwise switches the resonance frequency to a frequency used for wireless communication. The wireless communication antenna 231 can be connected to the communication circuit 210 directly or through other elements. The resonance frequency of the wireless communication antenna is fixed at a frequency used for wireless communication. Thereby, although there is interference by the wireless communication antenna 231 during power reception, interference by the non-contact power reception antenna 232 during wireless communication can be reduced.

  On the other hand, only the resonance frequency switching unit for the wireless communication antenna 231 can be provided. In this case, when the detection circuit 240 outputs a detection result indicating that power is being received, the resonance frequency switching unit 250 connected to the wireless communication antenna 231 changes the resonance frequency of the wireless communication antenna 231 to wireless power transmission. Switch to the frequency used, otherwise switch the resonance frequency to the frequency used for wireless communication. The non-contact power receiving antenna 232 can be connected to the power supply circuit 220 directly or through other elements. The non-contact power receiving antenna 232 is set to resonate at a frequency used for non-contact power transmission. Thereby, although there is interference by the power receiving antenna 232 during wireless communication, interference by the wireless communication antenna 231 during power reception can be reduced.

  In FIG. 2, one resonance frequency switching unit is provided for each of the wireless communication antenna 231 and the non-contact power receiving antenna 232, but one resonance frequency switching unit switches the resonance frequency of both antennas. It is good.

  Furthermore, in FIG. 2, the resonance frequency switching units 250 and 260 are configured to be connected to the wireless communication antenna 231 and the communication circuit 210 or the non-contact power receiving antenna 232 and the power feeding circuit 220. However, as shown in FIG. 3A, the resonance frequency switching units 350 and 360 may not be connected to them. For example, the resonance frequency switching units 350 and 360 can switch the resonance frequency by being coupled to each antenna with a magnetic field or an electric field. Further, for example, the resonance frequency switching units 350 and 360 are resonance coils, the resonance frequency switching unit 350 and the wireless communication antenna 231, and the resonance frequency switching unit 360 and the non-contact power receiving antenna 232 are coupled by a magnetic field or an electric field. It is also possible to adopt a configuration in which the resonance frequency of the resonance coil of the frequency switching units 350 and 360 is switched.

  As illustrated in FIG. 3B, the resonance frequency switching units 250 and 260, the wireless communication antenna 231, and the non-contact power receiving antenna 232 may not be connected to the communication circuit 210 or the power feeding circuit 220. For example, the resonant frequency switching units 380 and 390 are connected to the wireless communication antenna 371 and the non-contact power receiving antenna 372, respectively, and switch the resonant frequency. The wireless communication antenna 371 and the non-contact power receiving antenna 372 are used as resonance coils to receive a wireless communication signal or perform non-contact power reception. The wireless communication antenna 371 and the non-contact power reception antenna 372 are coupled to the reception coil 373 for wireless communication and the power reception coil 374 for non-contact power reception by a magnetic field or an electric field, thereby transmitting signals to the communication circuit 210 or the power supply circuit 220. Electric power can be supplied.

[Second Embodiment]
FIG. 4 shows a second embodiment of the present invention. In this embodiment, a shunt circuit 470 connected between the wireless communication antenna 231 and the communication circuit 210 is further provided in addition to the first embodiment. Other configurations are the same as those of the first embodiment. In the following description, the same constituent elements as those of the first embodiment are referred to by the same reference numerals, and the description thereof is omitted as appropriate.

  In this embodiment, the wireless communication antenna 231 is connected to two signal lines for connecting to the communication circuit 210, and the wireless communication antenna 231 is connected between the wireless communication antenna 231 and the communication circuit 210 via these two signal lines. The resonance frequency switching unit 250 and the shunt circuit 470 are connected from the side. The shunt circuit 470 shorts or opens the two signal lines.

  When the detection circuit 240 does not output a detection result that the non-contact power receiving antenna 232 is receiving power, the shunt circuit 470 opens the connection between the two signal lines. Thereby, the signal received by the wireless antenna 231 is transmitted to the communication circuit 210 without being detoured, and wireless communication can be performed. On the other hand, when the detection circuit 240 outputs a detection result that the non-contact power receiving antenna 232 is receiving power, the shunt circuit 470 short-circuits the two signal lines. As a result, most of the power received by the wireless communication antenna 231 is bypassed by the shunt circuit 470 and returned to the wireless communication antenna 231 and does not flow into the communication circuit 210. As a result, it is possible to prevent a large current from flowing into the communication circuit 210 and destroying the communication circuit. The shunt circuit 470 may open the signal line when an output signal indicating that communication is in progress is obtained from the detection circuit 240, and may be short-circuited when a signal indicating that communication is being performed is not received. Alternatively, the signal line may be opened when a signal indicating that communication is being performed, and may be short-circuited when a signal indicating that power is being received.

[Third Embodiment]
FIG. 5 shows a third embodiment. In the present embodiment, unlike the second embodiment, neither the wireless communication antenna 231 nor the non-contact power receiving antenna 232 has a frequency switching unit. The rest is the same as in the second embodiment. According to such a configuration, although interference between antennas cannot be reduced, destruction of the communication circuit 210 due to power reception can be prevented.

[Example 1]
Next, a first embodiment of the present invention will be described with reference to FIG. In the present embodiment, the contactless power receiving device 120 includes a contactless power receiving circuit 200, a communication circuit 210, and a power supply circuit 220. The non-contact power receiving circuit 200 includes an antenna unit 630, and the antenna unit 630 includes a wireless communication antenna 631 and a non-contact power receiving antenna 632. Further, the non-contact power receiving circuit 200 includes a detection circuit 240 that detects whether or not power is being received and outputs the result, and a resonance frequency switching unit 660 for the non-contact power receiving antenna 632. Each antenna is a coil antenna. In this embodiment, the resonance frequency switching unit for the wireless communication antenna is not provided. The resonance frequency of the wireless communication antenna is fixed at a frequency used for wireless communication. The frequency used for wireless power transmission is 6.78 MHz, and the frequency used for wireless communication is 13.56 MHz. In the other embodiments, the same frequency is used unless otherwise specified.

  In this embodiment, a shunt circuit 670 is provided between the wireless communication antenna 631 and the communication circuit 210. The wireless communication antenna 631 is connected to two signal lines for connection to the communication circuit 210, and a shunt circuit 670 is connected between the wireless communication antenna 631 and the communication circuit 210 via these two signal lines. The shunt circuit 670 implements a shunt circuit by a switch 671 that shorts or opens two signal lines, but is not limited thereto. The shunt circuit may have any configuration as long as the two signal lines are short-circuited or opened.

  The resonance frequency switching unit 660 for the non-contact power receiving antenna 632 includes one capacitor 661 and another capacitor 662 and a switch 663 connected in parallel to the capacitor 661. When the switch 663 is opened (off), only the capacitor 661 is connected to the non-contact power receiving antenna 632, and the resonance frequency of the non-contact power receiving antenna 632 becomes a frequency used for wireless communication. On the other hand, when the switch 663 is closed (ON) and the capacitor 661 and the capacitor 662 are connected in parallel and connected to the non-contact power receiving antenna 632, the resonance frequency of the non-contact power receiving antenna 632 is used for non-contact power transmission. Frequency. Here, the fact that only the capacitor 661 is connected to the non-contact power receiving antenna 632 only means that the capacitor 662 is not connected, and does not mean that no other elements are connected. The same applies to other descriptions in this specification.

  An example of the arrangement of the wireless communication antenna 631 and the non-contact power receiving antenna 632 and the direction of magnetic flux of the non-contact power receiving circuit 200 in this embodiment is shown in FIGS. Each of FIGS. 7 and 8 is a cross-sectional view of the antenna unit 630 shown in FIG. The non-contact power receiving antenna 632 is provided outside the wireless communication antenna 631 on the same plane. Although not particularly limited, each coil is composed of several turns of winding wiring. In FIG. 7, the magnetic flux during wireless communication is indicated by an arrow, and in FIG. 8, the magnetic flux during power transmission is indicated by an arrow. The direction of the magnetic flux is from the power transmission device side to the power reception device side.

  Next, the operation of the non-contact power receiving device 120 in this embodiment will be described. When a signal is transmitted from the power supply stand 110 at a frequency of 13.56 MHz used for wireless communication, the detection circuit 240 does not output a detection result indicating that power is received. Therefore, the resonance frequency switching unit 660 turns off the switch 663, disconnects the capacitor 662, and makes the non-contact power receiving antenna 632 and the power supply circuit 220 conductive through the capacitor 661. The non-contact power receiving antenna 632 resonates at a frequency used for wireless communication. The shunt circuit 670 opens the terminal of the antenna coil 631 for wireless communication by turning off the switch 671. Then, a current based on the signal flows by the induced electromotive force inside the radio communication receiving antenna 631, which is transmitted to the communication circuit 210, and communication between the communication circuit and the counterpart communication device is executed.

  Since the non-contact power receiving antenna 632 does not resonate at the resonance frequency of wireless power transmission but resonates at the resonance frequency of wireless communication, interference due to the non-contact power receiving antenna is reduced, and communication with little deterioration in sensitivity becomes possible. Further, as shown in FIG. 7, the magnetic flux at the time of wireless communication may be a magnetic flux that passes through the coil for wireless communication antenna 631 from the power transmission device side and also passes through the coil for non-contact power receiving antenna 632. As a result, wireless communication via the non-contact power receiving antenna coil 632 is also performed, so that communication without deterioration in sensitivity is possible.

  On the other hand, when wireless power transmission is performed from the power supply base 110 at a frequency of 6.78 MHz, the detection circuit 240 outputs a detection result indicating that power is received. Therefore, the resonance frequency switching unit 660 turns on the switch 663 and makes the non-contact power receiving antenna 632 and the power supply circuit 220 conductive through the capacitors 661 and 662 connected in parallel. The non-contact power receiving antenna 632 resonates at a frequency used for wireless power transmission. The shunt circuit 670 shorts between the coil terminals of the wireless communication antenna 631 by turning on (closing) the switch 671. As a result, a current flows due to the induced electromotive force inside the wireless communication antenna coil 611, but a large current flows in a loop path formed by being short-circuited by the switch 671, and the current supply to the communication circuit 210 is suppressed. 210 can be prevented from being destroyed by excessive voltage. In the present embodiment, since the resonance frequency switching unit for the wireless communication antenna is not provided, the wireless communication antenna 631 may interfere with the non-contact power receiving antenna 632. Compared to the influence on the wireless communication antenna 631, it is relatively small.

  Note that when the switch 663 is open, the capacitance provided by the resonance frequency switching unit 660 is only the capacitance of the capacitor 661. When the switch 663 is closed, a value obtained by adding the capacitances of the capacitors 661 and 662 is obtained. That is, the capacity is larger when the switch 663 is closed. The larger the capacitance, the lower the resonance frequency. Therefore, when the switch 663 is closed, the resonance frequency is lower, and when the switch is opened, the resonance frequency is higher. In this embodiment, the frequency of contactless power transmission is 6.78 MHz and the frequency used for wireless communication is 13.56 MHz. Therefore, when selecting the frequency of contactless power transmission, the switch 663 is closed and the wireless communication is performed. When selecting, the switch 663 is opened. The capacities of these capacitors and how the switches are switched are appropriately selected depending on the frequency used for wireless communication and wireless power transmission.

  When the frequency of non-contact power transmission is lower than the frequency used for wireless communication as in this embodiment, the self-inductance value of the coil for the non-contact power receiving antenna is set to suppress the decrease in efficiency of non-contact power transmission. It needs to be bigger. Since a larger self-inductance value can be obtained by disposing the non-contact power receiving antenna 632 outside the wireless communication antenna 631, when the frequency of non-contact power transmission is lower than the frequency used for wireless communication, the non-contact It is possible to suppress a decrease in efficiency of power transmission.

[Example 2]
FIG. 9 shows a circuit configuration of the second embodiment of the present invention. The difference from the first embodiment is that the arrangement of the wireless communication antenna 931 and the non-contact power receiving antenna 932 in the antenna unit 930 is opposite to that of the first embodiment. In the first embodiment, the non-contact power receiving antenna 632 is arranged outside the wireless communication antenna 631 so as to surround the wireless communication antenna 631, whereas in the present embodiment, the wireless communication antenna 931 is not contactless power receiving. The non-contact power receiving antenna 932 is disposed outside the antenna 932 so as to surround it. The other points are the same as those of the first embodiment.

  According to the present embodiment, since the wireless communication antenna 931 is located outside the non-contact power receiving antenna 932, there is an effect that the communication area can be increased.

  When the frequency of non-contact power transmission is opposite to the frequency used for wireless communication, that is, the frequency of non-contact power transmission is 13.56 MHz and the frequency used for wireless communication is 6.78 MHz. In this case, unlike the first embodiment, the resonance frequency switching unit 960 turns off the switch 963 and turns on the non-contact power receiving antenna 932 via the capacitor 961 when selecting the frequency of non-contact power transmission. When the frequency to be used is selected, the switch 963 is turned on to conduct through the capacitor 961 and the capacitor 962.

  Thus, when the frequency used for wireless communication is lower than the frequency of non-contact power transmission, it is necessary to increase the self-inductance value of the coil for the wireless communication antenna in order to suppress a decrease in efficiency of the wireless communication. Since a larger self-inductance value can be obtained by disposing the wireless communication antenna 931 outside the non-contact power receiving antenna 932, wireless communication can be performed when the frequency used for wireless communication is lower than the frequency of non-contact power transmission. It is possible to suppress a decrease in efficiency.

  Generally, the lower frequency so as to surround the wireless communication unit or non-contact power receiving unit that uses the higher one of the frequency used for wireless communication and the frequency used for non-contact power transmission. By arranging the wireless communication unit or the non-contact power receiving unit using the outside, efficient wireless communication transmission or non-contact power transmission can be realized.

[Example 3]
Next, Example 3 using a resonance coil and a power receiving coil will be described. The circuit configuration of the third embodiment is shown in FIG. In this embodiment, in place of the circuit for switching the resonance frequency by the two capacitors 661 and 662 and the switch 663 in the first embodiment, the resonance frequency switching unit 1060 has a non-contact power receiving antenna 1064 that works as a resonance coil not connected to the power supply circuit 220 and Power is received by electromagnetic induction from two capacitors 1061 and 1062 connected to the non-contact power receiving antenna 1064, a switch 1063 that conducts the capacitor 1062 based on an output from the detection circuit 240, and a non-contact power receiving antenna 1064 that functions as a resonance coil. And a power receiving antenna 1065 serving as a power receiving coil. The power receiving antenna 1065 is disposed on the back surface of the surface on which the wireless communication antenna 631 and the non-contact power receiving antenna 632 are disposed, for example. However, the arrangement surface is not limited to this. The power receiving antenna 1065 is connected to the power supply circuit 220 and the detection circuit 240.

  The capacitor 1061 and the capacitor 1062 are connected in parallel. Capacitor 1061 has a capacity at which non-contact power receiving antenna 1064 acting as a resonance coil resonates at a frequency used for wireless communication, and a capacitor capacity obtained by adding the capacitances of capacitor 1061 and capacitor 1062 connected in parallel is a resonance coil. The non-contact power receiving antenna 1064 acting as a capacitor resonates at a frequency used for non-contact power transmission.

  When the detection circuit 240 does not output the detection result that the power receiving antenna 1065 that receives power by electromagnetic induction from the non-contact power receiving antenna 1064 that functions as a resonance coil is receiving power, the resonance frequency switching unit 1060 turns off the switch 1063, The capacitor 1062 is disconnected, and the non-contact power receiving antenna 1064 that functions as a resonance coil is made conductive through the capacitor 1061. Accordingly, the wireless communication antenna 631 and the non-contact power receiving antenna 1064 resonate at a frequency used for wireless communication, and wireless communication can be performed without interference by the non-contact power receiving antenna 1064. On the other hand, when the detection circuit 240 outputs a detection result that the power receiving antenna 1065 that receives power by electromagnetic induction from the non-contact power receiving antenna 1064 that functions as a resonance coil is output, the resonance frequency switching unit 1060 turns on the switch 1063. Thus, the resonance coil 1064 is conducted through the capacitor 1061 and the capacitor 1062 connected in parallel. Accordingly, the non-contact power receiving antenna 1064 can resonate at a frequency used for wireless power transmission and can perform non-contact power reception.

  By adopting such a configuration, in addition to the effects of the first embodiment, the power receiving coil 1065 and the non-contact power receiving antenna 1064 acting as a resonance coil that is a coil antenna are coupled by a magnetic induction method, and the power supply circuit The impedance matching with 220 becomes easy to take.

  In this embodiment, the wireless communication antenna 631 may be disposed outside the non-contact power receiving antenna 632.

  Also, it is obvious that this embodiment can be applied to the wireless communication unit. That is, the resonance frequency switching unit is connected to a wireless communication antenna that operates as a resonance coil and is not connected to the communication circuit 210, and the reception coil is connected to the communication circuit 210. The configuration and operation of the resonance frequency switching unit are the same as those applied to the non-contact communication unit.

[Example 4]
Next, a fourth embodiment of the present invention will be described. FIG. 11 shows a circuit configuration diagram of the fourth embodiment. In the present embodiment, instead of the circuit for switching the resonance frequency by the two capacitors 661 and 662 and the switch 663 in the first embodiment, the resonance frequency switching unit 1160 is connected to one end of the coil of the non-contact power receiving antenna 632 that is a coil antenna. A feed line 1161 connected to the power supply circuit 220, a feed line 1162 connected to the other end of the antenna coil 632, a feed line 1163 connected between one end and the other end of the antenna coil 632; The present embodiment is different from the first embodiment in that it includes a power supply line 1164 connected to the power supply circuit 220 and a switch 1165 that connects one of the power supply line 1162 and the power supply line 1163 to the power supply line 1164. When the resonance frequency of the non-contact power receiving antenna 632 when connected to the power supply line 1164 via the power supply line 1162 is a frequency used for non-contact power transmission and is connected to the power supply line 1164 via the power supply line 1163 The resonance frequency of the non-contact power receiving antenna 632 is set to be a frequency used for wireless communication. That is, the inductance of the antenna coil is changed by changing the number of turns of the coil acting as an antenna, and the resonance frequency of the antenna is switched. The capacitor 1190 is a resonance capacitor.

  When the detection circuit 240 does not output a detection result that the non-contact power receiving antenna 632 is receiving power, the resonance frequency switching unit 1160 switches the switch 1165 so that the power supply line 1163 is connected to the power supply line 1164. Accordingly, the wireless communication antenna 631 and the non-contact power receiving antenna 632 resonate at a frequency used for wireless communication, and wireless communication can be performed without interference by the non-contact power receiving antenna 632. When the detection circuit 240 outputs a detection result that the non-contact power receiving antenna 632 is receiving power, the resonance frequency switching unit 1160 switches the switch 1165 so that the feed line 1162 is connected to the feed line 1164. Thereby, the non-contact power receiving antenna resonates at a frequency used for wireless power transmission and can perform non-contact power reception.

  In addition to the effects of the first embodiment, the change of the resonance frequency between the frequency of contactless power transmission and the frequency used for wireless communication can be realized only by the switch, so that the mounting area can be reduced. In addition, the optimal coil length can be easily selected for each of the non-contact power transmission frequency and the wireless communication frequency using the non-contact power receiving antenna and the changeover switch. And the range of selection of frequencies for wireless communication is widened.

  In the present embodiment, it is obvious that the resonance frequency switching section 660 described in the first embodiment and the resonance frequency switching section 1160 described in the third embodiment can be used together. Further, the wireless communication antenna 631 may be disposed outside the non-contact power receiving antenna 632.

[Example 5]
Next, a fifth embodiment of the present invention will be described. FIG. 12 shows a circuit configuration diagram of the fifth embodiment. In this embodiment, instead of the circuit for switching the resonance frequency by the two capacitors 661 and 662 and the switch 663 in the first embodiment, a capacitor 1271 connected between the wireless communication antenna 631 and the communication circuit 210 and the capacitor 1271 A resonance frequency switching unit 1270 having a switch 1272 that connects the wireless communication antenna 631 and the communication circuit 210 without using the antenna is provided. The resonance frequency of the wireless communication antenna 631 when connected to the communication circuit 210 via the capacitor 1271 becomes a frequency used for non-contact power transmission, and wireless communication when connected to the communication circuit 210 without passing through the capacitor 1271 The resonance frequency of the antenna 631 is set to be a frequency used for wireless communication. The capacitor 1290 is a resonance capacitor.

  When the detection circuit 240 does not output the detection result that the non-contact power receiving antenna 632 is receiving power, the resonance frequency switching unit 1270 does not pass the capacitor 1271 so that the wireless communication antenna 631 is connected to the communication circuit 210. Switch 1272 is switched. Accordingly, the wireless communication antenna 631 can resonate at a frequency used for wireless communication and perform wireless communication. When the detection circuit 240 outputs a detection result that the non-contact power receiving antenna 632 is receiving power, the switch 1272 is switched so that the wireless communication antenna 631 is turned on via the capacitor 1271. Accordingly, the wireless communication antenna 631 and the non-contact power receiving antenna 632 resonate at a frequency used for wireless power transmission, and can perform non-contact power reception without interference by the wireless communication antenna 631.

  By adopting the configuration of the present embodiment, even when the wireless communication antenna coil and the non-contact power receiving antenna coil are arranged close to each other so that the wireless communication area and the power feeding area coincide with each other, By combining the communication antenna coil and the non-contact power receiving antenna coil, it is possible to reduce deterioration of power receiving efficiency. In addition, it is possible to prevent the communication circuit from being destroyed by the switch during power reception.

[Example 6]
Next, a sixth embodiment of the present invention will be described. FIG. 13 is a circuit configuration diagram of the sixth embodiment. In the present embodiment, in place of the capacitor 1271 and the switch 1272 in the fifth embodiment, the resonance frequency switching unit 1370 is connected to one end of the coil of the wireless communication antenna 631 that is a resonance coil and is connected to the communication circuit 210. 1371, a signal line 1372 connected to the other end of the coil of the wireless communication antenna 631, and a capacitor 1375 connected in series, a signal line 1373 connected between one end and the other end of the coil of the wireless communication antenna 631; A signal line 1374 connected to the communication circuit 210 and a switch 1376 that connects one of the signal line 1372 and the signal line 1373 to the signal line 1374 are provided. The resonance frequency of the wireless antenna 631, which is a resonance coil when connected to the signal line 1374 via the signal line 1372 and the capacitor 1375, becomes a frequency used for non-contact power transmission, and is transmitted to the signal line 1374 via the signal line 1373. The resonance frequency of the wireless communication antenna when connected is set to be a frequency used for wireless communication.

  When the detection circuit 240 does not output the detection result that the non-contact power receiving antenna 632 is receiving power, the resonance frequency switching unit 1370 switches the switch 1376 to be connected to the signal line 1374 via the signal line 1373. . Accordingly, the wireless communication antenna 631 can resonate at a frequency used for wireless communication and perform wireless communication. When the detection circuit 240 outputs a detection result that the non-contact power receiving antenna 632 is receiving power, the resonance frequency switching unit 1370 is connected to the signal line 1374 via the second signal line 1372 and the capacitor 1375. Switch 1376 is switched as follows. Accordingly, the wireless communication antenna 631 and the non-contact power receiving antenna 632 resonate at a frequency used for wireless power transmission, and can perform non-contact power reception without interference by the wireless communication antenna.

  By adopting such a configuration, in addition to the effects of the fifth embodiment, the wireless communication antenna 631 and the resonance frequency switching unit 1370 are used to wirelessly transmit the non-contact power transmission frequency and the wireless communication frequency. Since the optimum coil length can be selected in resonance with the capacitor 1375 connected to the communication antenna 631, there is an effect that the range of selection of the frequency for non-contact power transmission and the frequency for wireless communication is widened.

  In the present embodiment, it is obvious that the resonance frequency switching unit 1270 of the fifth embodiment can be used together.

[Example 7]
Next, a seventh embodiment of the present invention will be described. FIG. 14 shows a circuit configuration diagram of the seventh embodiment. In the present embodiment, a resonance frequency switching unit 1270 connected to the wireless communication circuit of the fifth embodiment is added to the configuration of the first embodiment.

  That is, the contactless power receiving device 120 includes a contactless power receiving circuit 200, a communication circuit 210, and a power supply circuit 220. The non-contact power receiving circuit 200 includes an antenna unit 630, and the antenna unit 630 includes a wireless communication antenna 631 and a non-contact power receiving antenna 632. Further, the non-contact power receiving circuit 200 includes a detection circuit 240 that detects whether or not power is being received and outputs the result, and a resonance frequency switching unit 660 for the non-contact power receiving antenna 632. Further, a resonance frequency switching unit 1270 having a capacitor 1271 connected between the wireless communication antenna 631 and the communication circuit 210 and a switch 1272 that connects the wireless communication antenna 631 and the communication circuit 210 without using the capacitor 1271. Prepare. The resonance frequency of the wireless communication antenna 631 when connected to the communication circuit 210 via the capacitor 1271 is a frequency used for non-contact power transmission, and wireless communication when connected to the communication circuit 210 without passing through the capacitor 1271 The resonance frequency of the antenna 621 is set to be a frequency used for wireless communication. Further, a shunt circuit 670 is provided between the wireless communication antenna 631 and the communication circuit 210. The wireless communication antenna 631 is connected to two signal lines for connection to the communication circuit 210, and a shunt circuit 670 is connected between the wireless communication antenna 631 and the communication circuit 210 via these two signal lines.

  When the detection circuit 240 does not output the detection result that the non-contact power receiving antenna 632 is receiving power, the switch 671 in the shunt circuit 670 is turned off to open the terminals of the antenna coil 631 for wireless communication. The resonant frequency switching unit 1270 for the wireless communication antenna 631 switches the switch 1272 so that the wireless communication antenna 631 is conducted to the communication circuit 210 without using the capacitor 1271. The resonance frequency switching unit 660 for the non-contact power receiving antenna 632 turns off the switch 663, disconnects the capacitor 662, and makes the non-contact power receiving antenna 632 and the power supply circuit 220 conductive through the capacitor 661. The non-contact power receiving antenna 632 resonates at a frequency used for wireless communication.

  When the detection circuit 240 outputs a detection result that the non-contact power receiving antenna 632 is receiving power, the shunt circuit 670 short-circuits the terminals of the coils of the wireless communication antenna 631 by turning on the switch 671. The resonance frequency switching unit 1270 for the wireless communication antenna 631 switches the switch 1272 so that the wireless communication antenna 631 is conducted via the capacitor 1271. The resonance frequency switching unit 660 for the non-contact power receiving antenna 632 turns on the switch 663 and causes the non-contact power receiving antenna 632 and the power supply circuit 220 to conduct through the capacitor 661 and the capacitor 662 connected in parallel. The non-contact power receiving antenna 632 resonates at a frequency used for wireless power transmission.

  By adopting the configuration of the present embodiment, even when the wireless communication antenna and the non-contact power receiving antenna are arranged close to each other, the wireless communication antenna and the non-contact power receiving antenna are combined at the time of wireless communication, thereby degrading the communication sensitivity. In the case of non-contact power transmission, the wireless communication antenna and the non-contact power receiving antenna can be combined to eliminate the deterioration of power receiving efficiency. In addition, it is possible to prevent the communication circuit from being destroyed by the shunt circuit when receiving power.

  In the present embodiment, it is obvious that the resonance frequency switching unit 1160 of the fourth embodiment and the resonance frequency switching unit 1370 of the sixth embodiment can be used together.

[Example 8]
Next, an eighth embodiment of the present invention will be described. FIG. 15 is a circuit diagram of the eighth embodiment. The present embodiment is a configuration that does not include the resonance frequency switching unit 660 in the configuration of the first embodiment. Neither the radio antenna 631 nor the non-contact power receiving antenna 632 has a resonance frequency switching unit. The rest is the same as in the first embodiment.

  That is, the contactless power receiving device 120 includes a contactless power receiving circuit 200, a communication circuit 210, and a power supply circuit 220. The non-contact power receiving circuit 200 includes an antenna unit 630, and the antenna unit 630 includes a wireless communication antenna 631 and a non-contact power receiving antenna 632. The non-contact power receiving circuit 200 further includes a detection circuit 240 that detects whether power is being received and outputs the result. The wireless communication antenna 631 is connected to two signal lines for connection to the communication circuit 210, and a shunt circuit 670 is connected between the wireless communication antenna 631 and the communication circuit 210 via these two signal lines.

  When the detection circuit 240 does not output the detection result that the non-contact power receiving antenna 632 is receiving power, the switch 671 in the shunt circuit 670 is turned off to open the terminals of the antenna coil 631 for wireless communication. When the detection circuit 240 outputs a detection result that the non-contact power receiving antenna 632 is receiving power, the shunt circuit 670 turns on (closes) the switch 671 so that the coil terminals of the wireless communication antenna 631 are connected. Short circuit. As a result, a current flows due to the induced electromotive force inside the wireless communication antenna coil 611, but a large current flows in a loop path formed by being short-circuited by the switch 671, and the current supply to the communication circuit 210 is suppressed. 210 can be prevented from being destroyed by excessive voltage.

  According to such a configuration, although interference between antennas cannot be reduced, it is possible to prevent a communication circuit from being destroyed due to power reception.

  Each embodiment described above is an example for explaining the present invention, and the present invention is not limited to these embodiments. The present invention can be implemented in various forms without departing from the gist thereof.

  Further, in all the embodiments and all the examples, when switching the resonance frequency of the non-contact power receiving antenna to the frequency used for wireless communication at the time of wireless communication, it is necessary to completely match the frequency used for wireless communication. Absent. In some cases, the sensitivity deterioration of wireless communication is less when the frequency slightly higher than the frequency used for wireless communication or the frequency slightly lower than the frequency used for wireless communication is set as the frequency used for wireless communication. is there. Similarly, when the resonance frequency of the wireless communication antenna is switched to the frequency used for contactless power transmission during contactless power reception, it is not necessary to completely match the frequency used for contactless power transmission. Non-contact power reception with a frequency slightly higher than the frequency used for non-contact power transmission or a frequency slightly lower than the frequency used for non-contact power transmission than with the frequency used for non-contact power transmission There are cases in which there is little sensitivity degradation. This will be described with reference to FIG.

  FIG. 17 shows a resonance state of wireless communication or non-contact power transmission. FIG. 17A shows a single peak characteristic, and FIG. 17B shows a double peak characteristic.

  When two or more systems that are resonating are at a certain distance (critical coupling position) as a boundary, a single peak characteristic of FIG. 17A is shown at a far distance, and a bimodal characteristic is shown at a close distance. For this reason, sensitivity deterioration occurs when the frequency causing the phenomenon shown in FIG. 7 is changed to the upper or lower side than the frequency used for wireless communication or the frequency used for contactless power transmission. May be less.

  Therefore, switching the resonance frequency of the non-contact power receiving antenna in the present invention to a frequency used for wireless communication and switching the resonance frequency of the wireless communication antenna to a frequency used for non-contact power transmission at the time of non-contact power reception are In addition to switching to a frequency used for wireless communication or non-contact power transmission accurately, switching to a frequency that resonates near that frequency is included.

DESCRIPTION OF SYMBOLS 100 Contactless power transmission / reception apparatus 110 Contactless power supply stand 120 Contactless power receiving apparatus 200 Contactless power receiving circuit 210 Communication circuit 220 Power supply circuit 230 Antenna part 231 Wireless communication antenna 232 Contactless power receiving antenna 240 Detection circuit 250 Resonance frequency switching part 260 Resonance frequency Switching unit 350 Resonance frequency switching unit 360 Resonance frequency switching unit 370 Antenna unit 371 Wireless communication antenna 372 Non-contact power receiving antenna 373 Reception coil antenna 374 Power receiving coil antenna 380 Resonance frequency switching unit 390 Resonance frequency switching unit 470 Shunt circuit 630 Antenna unit 631 Wireless Communication antenna 632 Non-contact power receiving antenna 660 Resonance frequency switching unit 661 Capacitor 662 Capacitor 663 Switch 670 Shunt circuit 671 Switch 680 Magnetic flux 930 Antenna unit 931 Radio communication antenna 932 Non-contact power receiving antenna 960 Resonance frequency switching unit 961 Capacitor 962 Capacitor 963 Switch 1060 Resonance frequency switching unit 1061 Capacitor 1062 Capacitor 1063 Switch 1064 Non-contact power receiving antenna 1065 Receiving coil antenna 1160 Resonance frequency switching unit 1161 Feed line 1162 Feed line 1163 Feed line 1164 Feed line 1165 Switch 1190 Capacitor 1270 Resonance frequency switching unit 1271 Capacitor 1272 Switch 1290 Capacitor 1370 Resonance frequency switching unit 1371 Signal line 1372 Signal line 1373 Signal line 1374 Signal line 1375 Capacitor 1376 Switch 1610a Non-contact power transmission Device 1620a Power transmission antenna 1622a Resonant antenna Tena 1624a Power transfer antenna 1630 Power reception circuit 1640 Communication antenna 1650 Cutoff circuit 1660 Communication circuit 1670 Control circuit

Claims (17)

A wireless communication unit;
A non-contact power receiving unit that receives power wirelessly transmitted from the power transmission side in a non-contact manner;
A detection circuit that detects at least one of whether power is being received and whether it is in communication, and outputs the result;
Based on the output of the detection circuit, at least one resonance frequency switching unit that switches at least one of the resonance frequency of the wireless communication unit and the resonance frequency of the non-contact power reception unit;
A non-contact power receiving circuit comprising: When the detection circuit does not output a detection result that the non-contact power receiving unit is receiving power or when the detection circuit outputs a detection result that the wireless communication unit is communicating, the at least one The resonance frequency switching unit switches at least one of the resonance frequency of the non-contact power receiving unit and the resonance frequency of the wireless communication unit to a frequency that is used for wireless communication and becomes resonant,
When the detection circuit outputs a detection result that the non-contact power receiving unit is receiving power, or when the detection circuit does not output a detection result that the wireless communication unit is communicating, the resonance frequency switching 2. The non-contact power receiving unit according to claim 1, wherein the unit switches at least one of a resonance frequency of the non-contact power receiving unit and a resonance frequency of the wireless communication unit to a frequency that is used for non-contact power transmission and becomes resonant. Contact power receiving circuit.   The at least one resonance frequency switching unit changes at least one of a capacitor capacity, an inductance, a magnetic field, and an electric field of the non-contact power receiving unit or the wireless communication unit based on an output from the detection circuit. The contactless power receiving circuit according to claim 1, wherein the resonance frequency is switched. The wireless communication unit is connected to at least two signal lines for connecting to a communication circuit that communicates with the counterpart communication device via the wireless communication unit,
The non-contact power receiving circuit further includes a shunt circuit connected between the wireless communication unit and the communication circuit,
4. The contactless power receiving circuit according to claim 1, wherein the shunt circuit short-circuits or opens the at least two signal lines based on an output of the detection circuit. 5. The shunt circuit includes a first switch for short-circuiting or opening between the at least two signal lines,
When the detection circuit outputs a detection result that the non-contact power reception unit is receiving power or when the detection circuit does not output a detection result that the wireless communication unit is communicating, the shunt circuit is A first switch is turned on to short-circuit the at least two signal lines;
When the detection circuit does not output the detection result that the non-contact power receiving unit is receiving power or when the detection circuit outputs the detection result that the wireless communication unit is communicating, the shunt circuit is The contactless power receiving circuit according to claim 4, wherein the first switch is turned off to open the connection between the at least two signal lines. The at least one resonance frequency switching unit includes a first capacitor connected to the non-contact power receiving unit, a second switch connected in parallel to the first capacitor, and a second capacitor,
The at least one resonance frequency switching unit is
The second switch is turned on, and the non-contact power receiving unit and the power supply circuit that supplies the power received by the non-contact power receiving unit through the first capacitor and the second capacitor connected in parallel are electrically connected Let the resonant frequency of the non-contact power receiving unit be switched to one of the frequency used for wireless communication and the frequency used for non-contact power transmission,
The second switch is turned off, the second capacitor is disconnected, and the non-contact power receiving unit and the power supply circuit are made conductive through the first capacitor, and the frequency and non-contact used for wireless communication The resonance frequency of the non-contact power receiving unit is switched to the other frequency used for power transmission,
When the detection circuit does not output a detection result that the non-contact power receiving unit is receiving power or when the detection circuit outputs a detection result that the wireless communication unit is communicating, the at least one The resonant frequency switching unit switches the resonant frequency of the non-contact power receiving unit so that the resonant frequency is used for wireless communication and becomes resonant.
When the detection circuit outputs a detection result that the non-contact power receiving unit is receiving power or when the detection circuit does not output a detection result that the wireless communication unit is communicating, the at least one The resonance frequency switching unit switches the resonance frequency of the non-contact power receiving unit so as to be a frequency that is used for non-contact power transmission and becomes resonant. Contact power receiving circuit.   Radio using a lower frequency so as to surround a radio communication unit or a non-contact power receiving unit which uses a higher one of a frequency used for radio communication and a frequency used for non-contact power transmission. The non-contact power reception circuit according to claim 1, wherein a communication unit or a non-contact power reception unit is disposed.   The contactless power receiving circuit according to claim 1, wherein the wireless communication unit is disposed so as to surround the contactless power receiving unit on the outside.   The contactless power receiving circuit according to any one of claims 1 to 8, wherein the contactless power receiving unit is disposed so as to surround the wireless communication unit on the outside. The contactless power receiving circuit further includes a power receiving coil connected to a power supply circuit that supplies power received by the contactless power receiving unit,
The non-contact power reception unit is a resonance coil, and is not connected to a power supply circuit that supplies power received by the non-contact power reception unit,
The at least one resonance frequency switching unit is
Third and fourth capacitors connected to the resonant coil;
A third switch for opening and closing the connection of the fourth capacitor,
The third and fourth capacitors are connected in parallel,
The at least one resonance frequency switching unit is
The third switch is opened to turn off the fourth capacitor, and the resonance coil is conducted through the third capacitor, so that the frequency used for wireless communication and the frequency used for non-contact power transmission can be reduced. Switch the resonance frequency of the non-contact power receiving unit to one frequency,
The third switch is closed, and the resonance coil is conducted through the third capacitor and the fourth capacitor connected in parallel to be used for frequency and non-contact power transmission used for wireless communication. The resonance frequency of the non-contact power receiving unit is switched to the other frequency.
When the detection circuit does not output a detection result that the non-contact power receiving unit is receiving power or when the detection circuit outputs a detection result that the wireless communication unit is communicating, the at least one The resonant frequency switching unit switches the resonant frequency of the non-contact power receiving unit so that the resonant frequency is used for wireless communication and becomes resonant.
When the detection circuit outputs a detection result that the non-contact power receiving unit is receiving power, or when the detection circuit does not output a detection result that the wireless communication unit is communicating, the resonance frequency switching The contactless power receiving circuit according to any one of claims 1 to 9, wherein the unit switches the resonance frequency of the contactless power receiving unit so that the resonance frequency is used for contactless power transmission. . The non-contact power reception unit is a resonance coil;
The resonance frequency switching unit is
A first power supply line connected to a power circuit connected to one end of the resonance coil and supplying power received by the non-contact power receiving unit;
A second feeder connected to the other end of the resonance coil;
A third feed line connected between one end and the other end of the resonance coil;
A fourth feeder connected to the power circuit;
A fourth switch that connects either the second feed line or the third feed line to the fourth feed line,
The at least one resonance frequency switching unit is
The fourth switch is switched so that the second feeder line is connected to the fourth feeder line, and the contactless frequency is set to one of the frequency used for wireless communication and the frequency used for contactless power transmission. Switch the resonance frequency of the power receiving unit,
The fourth switch is switched so that the third feeder line is connected to the fourth feeder line, and the contactless frequency is switched to the other one of the frequency used for wireless communication and the frequency used for contactless power transmission. The resonance frequency of the power receiving unit is switched,
When the detection circuit does not output a detection result that the non-contact power receiving unit is receiving power or when the detection circuit outputs a detection result that the wireless communication unit is communicating, the at least one The resonant frequency switching unit switches the resonant frequency of the non-contact power receiving unit so that the resonant frequency is used for wireless communication and becomes resonant.
When the detection circuit outputs a detection result that the non-contact power receiving unit is receiving power or when the detection circuit does not output a detection result that the wireless communication unit is communicating, the at least one The resonance frequency switching unit switches the resonance frequency of the non-contact power receiving unit so as to be a frequency that is used for non-contact power transmission and becomes resonant. Contact power receiving circuit. The at least one resonance frequency switching unit communicates the wireless communication unit with the counterpart communication device via the wireless communication unit without passing through the fifth capacitor connected to the wireless communication unit and the fifth capacitor. A fifth switch connected to the communication circuit,
The at least one resonance frequency switching unit is
Switch the fifth switch so that the wireless communication unit is conducted without going through the fifth capacitor, and switch the wireless communication to one of the frequency used for wireless communication and the frequency used for non-contact power transmission. Switch the resonance frequency of the
The fifth switch is switched so that the wireless communication unit is conducted through the fifth capacitor, and the frequency of the wireless communication unit is set to the other one of the frequency used for wireless communication and the frequency used for contactless power transmission. When the detection circuit does not output the detection result that the non-contact power reception unit is receiving power or the detection circuit outputs the detection result that the wireless communication unit is communicating In this case, the at least one resonance frequency switching unit switches the resonance frequency of the wireless communication unit so that the resonance frequency is used for wireless communication and becomes resonance.
When the detection circuit outputs a detection result that the non-contact power receiving unit is receiving power or when the detection circuit does not output a detection result that the wireless communication unit is communicating, the at least one The contactless frequency switching unit according to any one of claims 1 to 11, wherein the resonance frequency switching unit switches a resonance frequency of the wireless communication unit so as to be a frequency that is used for contactless power transmission and becomes resonant. Power receiving circuit. The wireless communication unit is a resonance coil;
The at least one resonance frequency switching unit is
A first signal line connected to one end of the resonance coil and connected to a communication circuit that communicates with the counterpart communication device via the wireless communication unit;
A second signal line connected to the other end of the resonance coil and having a sixth capacitor connected in series;
A third signal line connected between one end and the other end of the resonance coil;
A fourth signal line connected to the communication circuit;
A sixth switch for connecting any one of the second signal line and the third signal line to the fourth signal line,
The at least one resonance frequency switching unit is
The sixth switch is switched so as to be connected to the fourth signal line via the second signal line, and the frequency is used as one of the frequency used for wireless communication and the frequency used for contactless power transmission. Switch the resonance frequency of the wireless communication unit,
The sixth switch is switched so as to be connected to the fourth signal line via the third signal line, and the frequency is used for the other one of the frequency used for wireless communication and the frequency used for contactless power transmission. The resonance frequency of the wireless communication unit is switched, and when the detection circuit does not output the detection result that the non-contact power receiving unit is receiving power or the detection result that the wireless communication unit is communicating When the detection circuit outputs, the at least one resonance frequency switching unit switches the resonance frequency of the wireless communication unit so that the resonance frequency is used for wireless communication,
When the detection circuit outputs a detection result that the non-contact power receiving unit is receiving power or when the detection circuit does not output a detection result that the wireless communication unit is communicating, the at least one The contactless frequency switching unit according to any one of claims 1 to 12, wherein the resonance frequency switching unit switches a resonance frequency of the wireless communication unit so as to be a frequency that is used for contactless power transmission and becomes resonant. Power receiving circuit. A wireless communication unit;
A non-contact power receiving unit that receives power wirelessly transmitted from the power transmission side in a non-contact manner;
A detection circuit that detects at least one of whether power is being received and whether it is in communication, and outputs the result;
A shunt circuit connected between the communication circuit that communicates with the counterpart communication device via the wireless communication unit and the wireless communication unit;
The wireless communication unit is connected to at least two signal lines for connecting to the communication circuit,
The contactless power receiving circuit according to claim 1, wherein the shunt circuit short-circuits or opens the at least two signal lines based on an output of the detection circuit. The shunt circuit includes a first switch for short-circuiting or opening between the at least two signal lines,
When the detection circuit outputs a detection result that the non-contact power reception unit is receiving power or when the detection circuit does not output a detection result that the wireless communication unit is communicating, the shunt circuit is A seventh switch is turned on to short-circuit the at least two signal lines;
When the detection circuit does not output the detection result that the non-contact power receiving unit is receiving power or when the detection circuit outputs the detection result that the wireless communication unit is communicating, the shunt circuit is The contactless power receiving circuit according to claim 14, wherein a connection between the at least two signal lines is released by turning off a seventh switch. A non-contact power receiving circuit according to any one of claims 1 to 15,
A communication circuit for communicating with a counterpart communication device via the wireless communication unit;
A power supply circuit for supplying power received by the non-contact power receiving unit;
A non-contact power receiving apparatus comprising: The non-contact power receiving device according to claim 16,
A contactless power transmitting and receiving device comprising: a contactless power transmitting device that transmits power to the contactless power receiving device in a contactless manner.

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