JP2010284006A - Non-contact power transmission apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a non-contact power transmission apparatus capable of providing both safety at power transmission and reliability in communication, in such a configuration that power transmission and data communication are performed at the same time even in using the same frequency band. <P>SOLUTION: Safety in power transmission, such as protection of equipment and prevention of electromagnetic wave radiation to surrounding environment, is satisfied by prohibiting the start of power transmission or stopping power transmission if the following conditions occur: when ID authentication for the target of power transmission fails; when a foreign matter containing a magnetic material or a conductive body present near equipment is detected; when the position of power receiving side equipment is not appropriate; when removal of power receiving side equipment during power transmission is detected; or when charging is completed. When no power transmission is performed, the electric power to be transmitted is controlled to control the output of electromagnetic wave so that only data communication can be executed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a non-contact power transmission device, and more particularly to a non-contact power transmission device suitable for mobile devices such as a mobile phone, a headset, a digital camera, and a digital video.

  In non-contact power transmission using electromagnetic induction, AM modulation is performed using a data communication signal on a power transmission wave between a power transmission side and a power reception side, so that power transmission and data communication are simultaneously performed using the same frequency band. This is practically used in devices that operate with very small power, such as non-contact type IC cards.

  However, there is a great demand for non-contact power transmission even in portable devices such as mobile phones and digital cameras. In particular, not only the power but also the power of at least several watts to these devices without hindering the communication function of the portable device In order to supply power, it is necessary to satisfy both safety during power transmission and communication reliability.

  In contactless power transmission that transmits power of several watts or more, in order to perform charging safely, the combination of the power transmitting side device and the power receiving side device needs to conform to the standard. When non-standard equipment is combined, there is a possibility that sufficient power cannot be transmitted or the equipment is damaged.

  In addition, it is also necessary that the power receiving device is properly installed with respect to the power transmitting device. If power transmission is started to a power receiving device installed off the proper position, it may cause heat generation or malfunction of the power receiving device. If there is a foreign matter, the foreign matter may generate heat.

  For such a problem, Patent Document 1 describes a configuration in which power transmission is started after authentication of a power receiving device.

  In Patent Document 1, the power transmission side control circuit performs temporary power transmission when the switch is turned on, the ID authentication unit performs ID authentication based on the ID authentication information, and the foreign object detection unit performs the first antenna during the power transmission period. Monitoring the induced voltage change to determine the presence or absence of foreign matter, the power transmission control unit stops temporary power transmission when ID authentication information is not received within a predetermined time, and when ID authentication by the ID authentication unit fails, A power transmission control device or power transmission that stops power transmission when removal is detected after the start of power transmission, when a metallic foreign object is detected, when a takeover state is detected, or when full charge is detected An apparatus, a non-contact power transmission system, and an electronic device are disclosed.

JP 2009-011129 A

  Unlike devices that supply power only during communication, such as contactless IC cards, mobile devices often have a secondary battery as an operating power source, and even after charging is stopped and power transmission is stopped, at least data It is desirable that communication can be performed without any problem.

  Also, in non-contact power transmission to portable devices, in order to meet the safety requirements during power transmission, such as protection of devices and prevention of electromagnetic radiation to the surrounding environment, ID authentication failure for power transmission targets or presence in the vicinity of the devices Do not start power transmission or stop power transmission if a metallic foreign object to be detected is detected, the installation state of the power receiving device is inappropriate, or removal of the power receiving device during power transmission is detected. Need to be configured.

  However, in the configuration of the conventional technique such as Patent Document 1, when the power transmission wave is modulated with the data communication signal and the power transmission and the data communication are performed simultaneously using the same frequency band, the data is transmitted when the power transmission is stopped. There is a problem that communication cannot be performed.

  The present invention has been made to solve the above-described problems of the prior art, and its purpose is to perform power transmission while using the same frequency band by performing AM modulation using a data communication signal as a power transmission wave. It is an object of the present invention to provide a non-contact power transmission device that achieves both safety during power transmission and communication reliability in a configuration in which data communication is performed simultaneously.

  According to the present invention, the power transmission device includes a power transmission side device having a first antenna that performs power transmission and communication in a non-contact manner using electromagnetic waves, and a power reception side device having a second antenna that performs power reception and communication using the electromagnetic waves, When performing the power transmission from the side device, the power transmission and the communication are performed simultaneously by performing AM modulation using the communication signal for the electromagnetic wave, and when the power transmission is not performed, the power of the power transmission is performed. Thus, a non-contact power transmission device can be obtained, wherein the output of the electromagnetic wave is controlled by means for controlling the power to perform only the communication.

  According to the present invention, the power transmitting side device performs polling for detecting the power receiving side device as an initial operation, and when the power receiving side device is detected, the ID is based on ID information stored in advance in the power receiving side device. If the authentication is performed and the power transmission is started after confirming the suitability of the combination of the power transmission side device and the power receiving side device and the ID authentication cannot be performed, or the suitability of the combination cannot be confirmed, the initial operation A non-contact power transmission apparatus characterized by performing the operation of returning to (2) is obtained.

  According to the present invention, when the power transmission side device detects the request to stop the power transmission by the communication with the power receiving side device after the power transmission side device starts the power transmission, the power transmission from the power transmission side device is stopped. Thus, a contactless power transmission device is obtained that performs the operation of returning to the initial operation.

  According to the present invention, there is provided position detecting means for determining the appropriateness of the position of the power receiving side device by detecting an AC voltage signal of the first antenna in the power transmission, and the power receiving side device in the position detecting means. Is detected, or when it is determined that the position of the power receiving side device is not appropriate, the power transmission from the power transmission side device is stopped.

  According to the present invention, there is provided a foreign object detection means for determining a change in the AC voltage signal of the first antenna in the power transmission and a change in the AC voltage signal due to the presence or absence of a foreign substance including a conductor or a magnetic substance, When a foreign object is detected, a non-contact power transmission device is obtained that performs the operation of stopping the power transmission from the power transmission side device and returning to the initial operation.

  According to the present invention, it is provided with removal detecting means for detecting that the power receiving side device has been removed by detecting the AC voltage signal of the first antenna in the power transmission, and the power receiving side device is removed. When detected, a non-contact power transmission apparatus is obtained that stops the power transmission from the power transmission side device and returns to the initial operation.

  According to the present invention, when performing the communication, the operation of the position detection means, the foreign object detection means, the removal detection means is stopped, or the position detection means at a time interval predetermined by the detection control means, A non-contact power transmission device characterized by operating the foreign matter detection means and the removal detection means is obtained.

  According to the present invention, the power transmission side device performs the ID authentication at a predetermined time interval in the power transmission, and stops power transmission when the ID authentication cannot be performed or when the suitability of the combination cannot be confirmed. A non-contact power transmission apparatus characterized by the above can be obtained.

  According to the present invention, it is possible to obtain a contactless power transmission device in which the power transmission side device includes means for switching execution and stop of the polling.

  According to the present invention, it is possible to obtain a non-contact power transmission device characterized in that the power receiving device includes power storage means for storing the received power and operating the power receiving device.

  According to the present invention, the power transmission side device includes power transmission control means for acquiring information of the power storage unit through the communication with the power receiving side device and changing the power of the power transmission according to the information. A non-contact power transmission apparatus is obtained.

  According to the present invention, in the configuration in which power transmission and data communication are performed simultaneously using the same frequency band by performing AM modulation using a data communication signal for a power transmission wave, failure in ID authentication for a power transmission target, When a foreign object including a conductor or magnetic substance present in the vicinity is detected, when the relative position between the power transmission side device and the power reception side device is not appropriate, when removal of the power reception side device during power transmission is detected, and When charging is completed, the power transmission is not started or the power transmission is stopped to protect the equipment and prevent electromagnetic radiation to the surrounding environment. In some cases, non-contact power that balances safety during power transmission and communication reliability by controlling the output of electromagnetic waves by controlling the power of power transmission, and performing only data communication. The provision of feeding device becomes possible.

It is a figure explaining an example of the operation | movement flow regarding the non-contact electric power transmission apparatus by this invention. It is a functional block diagram explaining an example of the power transmission side apparatus regarding the non-contact electric power transmission apparatus by this invention. It is a functional block diagram explaining an example of the power receiving side apparatus regarding the non-contact electric power transmission apparatus by this invention.

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

  FIG. 1 is a diagram for explaining an example of an operation flow relating to a non-contact power transmission apparatus according to the present invention. Note that FIG. 1 illustrates an example of a configuration in which a power receiving device includes a secondary battery. However, in a configuration that does not require a power storage component such as a secondary battery or a capacitor, matters related to the battery and charging are excluded.

  As an initial operation of the power transmission side device, polling power transmission is executed to detect a power reception side device, that is, a power transmission target.

  When the power transmission target is detected, the AC voltage signal of the first antenna of the power transmission side device is detected to detect the suitability of the standby position of the power reception side device including the second antenna. If no side device is detected, or if it is determined that the position of the power receiving device relative to the power transmitting device is not appropriate for power transmission and / or data communication, polling transmission from the power transmission device is stopped. To return to the initial operation.

  If it is suitable for position detection, ID authentication is performed based on ID information stored in advance in a memory provided in the power receiving device, and the suitability of the combination of the power transmitting device and the power receiving device is confirmed. If ID authentication fails, retry as many times as necessary. As a result, if ID authentication cannot be performed, or if the combination of the power transmitting side device and the power receiving side device cannot be confirmed, the initial operation is performed. Return.

  When ID authentication is performed, battery information is detected in the case of a configuration having a secondary battery. The battery information includes the type of battery, input power value, input current value, battery remaining amount, and the like, and is used as control information for performing optimal power transmission to the power receiving side device. When full charge of the battery is detected and data communication is not performed, the operation returns to the initial operation. When performing data communication, the communication is executed, and when the communication is completed, the initial operation is returned.

  If not fully charged, start charging. When the AC voltage signal of the first antenna of the power transmission side device is detected and the power receiving side device including the second antenna is removed from the voltage change, the removal detection, when the conductor or the foreign material of the magnetic material is in the vicinity The foreign objects are detected, and if they are detected, the charging is stopped and the operation returns to the initial operation.

  When full charge is detected, charging is stopped and the initial operation is resumed. If data communication is in progress when charging is stopped, charging power is cut by power control, and only data for communication is supplied and data communication is continued until the communication is completed. Power transmission and communication are executed according to the above processing procedure.

  Hereinafter, an example of the device configuration of the present invention will be described.

  FIG. 2 is a functional block diagram illustrating an example of a power transmission side device related to the non-contact power transmission apparatus according to the present invention.

  As illustrated in FIG. 2, the power transmission side device 100 includes a power transmission control device 110, a power transmission unit 120, a communication device 130, a detection unit 140, a first antenna 150 including a coil, and a power supply unit 170. . In addition, the power transmission control device 110 includes a power transmission control circuit 111, an oscillation circuit 112, and a detector control device 113. In addition, the communication device 130 includes a communication control circuit 131. Furthermore, the detection unit 140 includes a full charge detection circuit 141, a position detection circuit 142, a foreign object detection circuit 143, and a removal detection circuit 144.

  Moreover, the power transmission side apparatus 100 may be provided with the display part 160 for displaying an operation state.

  In addition, a secondary battery may be used as the power supply unit 170 of the power transmission side device 100.

  The power supply unit 170 may be provided outside the main body of the power transmission side device 100.

  FIG. 3 is a functional block diagram illustrating an example of a power receiving side device related to the non-contact power transmission apparatus according to the present invention.

  The power receiving side device 200 includes a power receiving control device 210, a power receiving unit 220, a communication device 230, a secondary battery 240, a memory 250, and a second antenna 260 formed of a coil. In addition, the power reception control device 210 includes a power reception control circuit 211. In addition, the power receiving unit 220 includes a rectifier circuit 221. In addition, the communication device 230 includes a communication control circuit 231.

  Moreover, the power receiving side device 200 may include any or all of a full charge detection circuit, a position detection circuit, a foreign object detection circuit, and a removal detection circuit included in the power transmission side device of FIG. 2 (not shown).

  The first antenna 150 included in the power transmission side device 100 of FIG. 2 and the second antenna 260 included in the power reception side device 200 of FIG. 3 are coupled from the power transmission side device 100 to the power reception side device 200 by electromagnetic induction. On the other hand, electric power can be transmitted without contact.

  The communication device 130 is a device capable of performing data communication such as RFID communication using a frequency of 13.56 MHz band, for example. The communication control circuit 131 generates a data signal and supplies the data signal to the power transmission control device 110. In addition, it receives a data signal sent from the power receiving device 200.

  The power transmission control device 110 includes a power transmission control circuit 111, a transmission circuit 112, and a detector control device 113. The oscillation circuit 112 generates an AC voltage having a frequency of, for example, 13.56 MHz band, and the power transmission unit 120. Supply AC voltage to

  When data communication is being performed, the power transmission control circuit 111 modulates the alternating voltage generated by the oscillation circuit 112 by the data signal supplied from the communication control circuit 131, and the modulated alternating current The voltage is supplied to the power transmission unit 120.

  In addition, the power transmission control circuit 111 adjusts the amount of power supplied to the first antenna 150, and demodulates the data signal sent from the power receiving device 200.

  The detector control device 113 controls the operation of the detection unit 140 when executing data communication. When performing data communication, in order to prevent erroneous detection in the detection unit due to an AC voltage change caused by a data signal, the detection unit 140 is not detected during data communication, or detection is performed at a predetermined time interval. Control to do.

  The power transmission unit 120 receives the AC voltage supplied from the power transmission control device 110 and supplies power to the first antenna 150.

  The first antenna 150 is supplied with electric power from the power transmission unit 120 and transmits electric power to the second antenna 260 by electromagnetic induction.

  The full charge detection circuit 141 detects the AC voltage supplied from the power transmission unit 120 to the first antenna 150, and when it is determined that the battery is fully charged, stops the power supplied to the first antenna 150 or data When communication is being performed, a signal for suppressing the supply amount to the power necessary for data communication is sent to the power transmission control device 110.

  As the state of charge approaches full charge, the supplied voltage increases, and when the voltage exceeds the allowable maximum voltage by comparing with the allowable maximum voltage when charging the secondary battery stored in the memory 250. Is fully charged.

  The position detection circuit 142 detects the AC voltage supplied from the power transmission unit 120 to the first antenna 150, and stops power supplied to the first antenna 150 when it is determined that the position is shifted, or performs data communication. Is transmitted to the power transmission control device 110 to suppress the supply amount to the power necessary for data communication. When the positional deviation occurs, the AC voltage decreases. Therefore, by measuring the AC voltage, it is determined that the positional deviation is below a predetermined voltage value. At this time, when the power transmission side device 100 is configured to include the display unit 160, it is desirable to display an error.

  The foreign object detection circuit 143 detects the AC voltage supplied from the power transmission unit 120 to the first antenna 150, and when the foreign object is detected, stops the power supplied to the first antenna 150 or performs data communication. If it is not, a signal for suppressing the supply amount to the power necessary for data communication is sent to the power transmission control device 110. When a foreign substance including a conductor or a magnetic substance is present in the vicinity of the first antenna 150, the AC voltage increases. Therefore, when the AC voltage is measured to exceed a predetermined voltage value, the presence of the foreign substance exists. Determine. At this time, when the power transmission side device 100 is configured to include the display unit 160, it is desirable to display an error.

  It is removal detection that the power receiving device 200 in the charged state is removed from the power transmission device 100 before it is fully charged, and the removal detection circuit 144 is connected to the first antenna 150 from the power transmission unit 120. If the AC voltage supplied to is detected and it is determined to be removed, the power supplied to the first antenna 150 is stopped, or if data communication is being performed, the power required for data communication is supplied. A signal for suppressing the amount is sent to the power transmission control device 110. When the removal occurs, the AC voltage decreases. Therefore, by measuring the AC voltage, it is determined that the removal is performed when the voltage falls below a predetermined voltage value.

  The second antenna 260 is supplied with power from the first antenna 150 by electromagnetic induction, and supplies the supplied power to the power reception control device 210.

  The power reception control device 210 includes a power reception control circuit 211, which demodulates a signal modulated to power supplied from the second antenna 260 during data communication, supplies a data signal to the communication device 230, and receives power from the power reception unit. 220. The power reception control device 210 has a function of performing load modulation for transmitting a signal transmitted from the communication device 230 to the power transmission side device 100 when information is transmitted from the power receiver 200 to the power transmission side device 100 by communication.

  The communication device 230 can rewrite the information stored in the memory 250 by a signal sent from the charging control device 210 and can send the information stored in the memory 250 as a signal to the power reception control circuit.

  The power reception unit 220 includes a rectifier circuit 221, converts the power supplied from the power reception control device 210 from an AC voltage to a DC voltage, and supplies the battery 240 with the DC power.

  The secondary battery 240 can store the electric power supplied from the power receiving unit 220, and includes a storage circuit such as a nickel hydride storage battery, a lithium ion storage battery, and a capacitor, a protection circuit, and the like.

  The memory 250 stores ID information of the power receiver 200, specification information of the secondary battery 240, and information necessary to execute charging.

  The display unit 160 can display the operating state of the power transmitter, and displays information such as [charging], [communication], [position shift], [foreign object detection], etc. on a liquid crystal display, a light emitting element, or the like. be able to.

  The embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to these embodiments, and the present invention is not limited to these embodiments, even if there are changes in members and configurations. Included in the invention. For example, the configuration of the device is not limited to that shown in FIGS. 2 and 3, and various modifications such as omitting some of the components, adding other components, changing the connection relationship, and the like. Implementation is possible. That is, various modifications and corrections that can naturally be made by those skilled in the art are also included in the present invention.

DESCRIPTION OF SYMBOLS 100 Power transmission side apparatus 110 Power transmission control apparatus 111 Power transmission control circuit 112 Oscillation circuit 113 Detector control apparatus 120 Power transmission part 130 Communication apparatus 131 Communication control circuit 140 Detection part 141 Full charge detection circuit 142 Position detection circuit 143 Foreign object detection circuit 144 Removal detection circuit 150 first antenna 160 display unit 170 power supply unit 200 power receiving side device 210 power receiving control device 211 power receiving control circuit 220 power receiving unit 221 rectifier circuit 230 communication device 231 communication control circuit 240 secondary battery 250 memory 260 second antenna

Claims (11)

  A power transmission side device having a first antenna that performs power transmission and communication in a contactless manner by electromagnetic waves; and a power reception side device having a second antenna that performs power reception and communication by the electromagnetic waves, and transmits the power transmission from the power transmission side device. In the case of performing the AM modulation using the communication signal for the electromagnetic wave, the power transmission and the communication are performed at the same time. When the power transmission is not performed, the means for controlling the power of the power transmission is used. A non-contact power transmission apparatus configured to control an output of an electromagnetic wave and perform only the communication.   The power transmission side device performs polling for detecting the power reception side device as an initial operation. When the power reception side device is detected, ID authentication is performed based on ID information stored in advance in the power reception side device, and the power transmission The power transmission is started after confirming the suitability of the combination of the side device and the power receiving device, and if the ID authentication cannot be performed or the suitability of the combination cannot be confirmed, the operation returns to the initial operation. The contactless power transmission device according to claim 1, wherein   When the power transmission side device detects the request to stop the power transmission by the communication with the power receiving side device after the power transmission side device starts the power transmission, the power transmission from the power transmission side device is stopped and returns to the initial operation. The contactless power transmission apparatus according to claim 1, wherein the contactless power transmission apparatus performs an operation.   In the case where the power receiving side device is not detected by the position detecting unit, the position detecting unit includes a position detecting unit that determines the suitability of the position of the power receiving side device by detecting the AC voltage signal of the first antenna in the power transmission, or The contactless power transmission device according to claim 1, wherein when it is determined that the position of the power receiving side device is not appropriate, the power transmission from the power transmission side device is stopped. .   When the foreign object is detected, comprising foreign object detection means for determining the change of the alternating voltage signal of the first antenna in the power transmission and the change of the alternating voltage signal due to the presence or absence of a foreign object including a conductor or a magnetic material The non-contact power transmission apparatus according to claim 1, wherein the power transmission from the power transmission side device is stopped and the operation of returning to the initial operation is performed.   In the case where the removal of the power receiving side device is detected by detecting removal of the power receiving side device by detecting the AC voltage signal of the first antenna in the power transmission. The contactless power transmission device according to claim 1, wherein the power transmission from the power transmission side device is stopped and the operation to return to the initial operation is performed.   When performing the communication, the operation of the position detection means, the foreign object detection means, the removal detection means is stopped, or the position detection means, the foreign object detection means, The non-contact power transmission apparatus according to claim 4, wherein the removal detecting means is operated.   The power transmission side device performs the ID authentication at a predetermined time interval in the power transmission, and stops power transmission when the ID authentication cannot be performed or when the suitability of the combination cannot be confirmed. The non-contact power transmission apparatus according to claim 2.   The non-contact power transmission apparatus according to claim 2, wherein the power transmission side device includes means for switching execution and stop of the polling.   The non-contact power transmission apparatus according to claim 1, further comprising a power storage unit configured to store the received power in the power receiving device and operate the power receiving device.   The power transmission side device includes a power transmission control unit that acquires information of the power storage unit through the communication with the power reception side device and changes the power of the power transmission according to the information. The non-contact power transmission device described in 1.

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