JP5556002B2 - Power transmission control device, power transmission device, non-contact power transmission system, and electronic device - Google Patents

Description

  The present invention relates to a power transmission control device, a power transmission device, a contactless power transmission system, an electronic device, and the like.

  In recent years, contactless power transmission (contactless power transmission) that uses electromagnetic induction and enables power transmission even without a metal part contact has been highlighted. Charging of telephone terminals and household equipment (for example, a handset of a telephone terminal and a clock) has been proposed.

A non-contact power transmission device using a primary coil and a secondary coil is described in Patent Document 1, for example.
JP 2006-60909 A

  In the non-contact power transmission device, for example, low power consumption is strictly required for extending the life of a battery (battery) of an electronic device. Therefore, it is important to suppress wasteful power transmission from the power transmission side device (power transmission side device) to the power reception side device (power reception side device) as much as possible.

  Moreover, in a non-contact power transmission device, safety and reliability higher than anything are required. For example, if power is accidentally transmitted to a non-standard power receiving device, the device may be damaged.

  Further, even when power is transmitted to a power receiving device that conforms to the standard, power transmission must be stopped if the power transmission environment is inappropriate. For example, when power transmission is performed in an environment where metal foreign objects exist, there is a risk of abnormal heat generation. In this case, power transmission must be stopped. However, the size of the metal foreign object may be small or medium, and large (for example, a thin plate that completely shuts off the power transmission side device and the power reception side device). It is desirable to take safety measures against foreign objects.

  In addition, the non-contact power transmission device has a purpose of improving the convenience of daily life for the user, and therefore needs to be a user-friendly device. In a non-contact power transmission device, it is also important to reduce the number of parts to achieve downsizing and cost reduction.

It is also important to provide a system that is highly convenient and flexible in order to satisfy the needs of customers who use contactless power transmission systems. Customer needs are diverse.
For example, while there are customers who want a system that can independently control the operation / non-operation of the system by turning the operation switch on and off (ie, a system having a switch mode), the switch operation is cumbersome and fully automatic. Some customers want a system that works with (ie, a system with auto mode). Further, for example, the customer may desire to use the switch mode and the auto mode appropriately according to the environment in which the system is installed. In order to widely disseminate contactless power transmission systems, it is important to respond precisely to the needs of such diverse customers.

  According to some embodiments of the present invention, for example, the switch mode and the auto mode can be appropriately switched according to the needs of the customer, which is highly convenient for the user and can reduce power consumption. A contactless power transmission technology can be provided. In addition, for example, it is possible to provide a highly reliable contactless power transmission technique in which all safety measures are taken.

  (1) One aspect of the power transmission control device of the present invention is a non-contact power transmission system that transmits power from a power transmission device to a power reception device in a contactless manner via an electromagnetically coupled primary coil and secondary coil. The power transmission control device provided in the power transmission device according to claim 1, wherein the power reception side device having the power reception device automatically detects that the device is installed in a place where power can be received by non-contact power transmission. An operation mode switching control signal for switching between an auto mode for starting normal power transmission for supplying power to the load of the side device and a switch mode for starting normal power transmission after the operation trigger switch is turned on. An operation mode switching terminal, an operation trigger terminal for inputting an operation trigger signal generated by operation of the operation trigger switch, and control of power transmission to the power receiving device Rutotomoni, having a power-transmitting-side control circuit for switching the operation mode of the power transmitting device based on the operation mode switch control signal.

  In the power transmission control device of this aspect, by supplying an operation mode switching signal to the power transmission side control circuit, a switch mode (a mode in which a predetermined operation is started when the operation trigger switch is turned on) and an auto mode (installation of the power transmission side device) It is possible to switch between a mode in which a predetermined operation is automatically detected and a predetermined operation is started. In the switch mode, after the user sets the power receiving device at a predetermined position, the user can turn on the operation trigger switch at an appropriate timing to start power transmission. In addition, power transmission can be forcibly stopped by re-operating the operation trigger switch and re-inputting the operation trigger signal to the power transmission side control circuit. That is, according to the switch mode, the non-contact power transmission system can be used as the user desires. In addition, since no power is transmitted from the power transmission device before the operation trigger switch is turned on, useless power consumption does not occur. On the other hand, in the auto mode, the power transmission control device automatically detects the installation of the power-receiving device and starts power transmission, which eliminates the need for the user to perform switch operations and improves the convenience and usability of the contactless power transmission system. To do. By enabling switching of the operation mode, a contactless power transmission system that can meet various needs is realized.

  (2) In another aspect of the power transmission side control circuit of the present invention, the power transmission side control circuit causes the power transmission device to perform intermittent temporary power transmission when the auto mode is selected by the operation mode switching control signal. Detecting the installation of the power receiving side device by detecting a response from the power receiving device that has received the temporary power transmission, and if the installation is detected, the power transmission device is continuously connected to the power receiving device. If normal installation is performed and the installation is not detected, the power transmission device is allowed to continue the intermittent temporary power transmission, and the switch mode is selected by the operation mode switching control signal. The device is controlled to repeat the start and stop of power transmission to the power receiving device each time the operation trigger signal is input to the operation trigger terminal.

  In this mode, when the auto mode is selected, the power transmission side control circuit automatically detects the installation of the power receiving side device by causing the power transmission device to perform intermittent temporary power transmission and detecting a response from the power receiving device. To do. The state where intermittent temporary power transmission is performed is continued until installation of the power receiving device is detected. When the switch mode is selected, when the user turns on the operation trigger switch, power transmission to the power receiving device (temporary power transmission) is started. When the user operates the operation trigger switch again, power transmission (temporary power transmission and normal power transmission) is started. Is forcibly stopped. Every time the operation trigger switch is turned on, the same operation is repeated.

  (3) In another aspect of the power transmission control device of the present invention, the power transmission side control circuit performs an ID authentication process before the normal power transmission, regardless of whether the auto mode or the switch mode is selected. And determine whether or not the power receiving side device is compatible with the contactless power transmission system, and after the ID authentication is successful, cause the power transmission apparatus to perform the normal power transmission.

  By performing ID authentication processing based on ID authentication information (for example, a number indicating the manufacturer, device ID number, power rating information, etc.) sent from the power receiving device before normal power transmission, Normal power transmission is reliably prevented, and reliability and safety are greatly improved.

  (4) In another aspect of the power transmission control device of the present invention, when the auto mode is selected by the operation mode switching control signal, the power transmission side control circuit causes the power transmission device to perform intermittent temporary power transmission. The installation of the power receiving device having the power receiving device is detected by whether or not ID authentication information from the power receiving device that has received the temporary power transmission can be received within a predetermined time from the start of the temporary power transmission, If installation of a power receiving device is detected, the power transmission device is allowed to execute normal power transmission to the power reception device on the condition that the ID authentication is successful, and the power reception device is received within a predetermined time from the start of the temporary power transmission. When the ID authentication information from the apparatus cannot be received, and when the ID authentication fails, the power transmission apparatus is kept in a state of executing the intermittent temporary power transmission.

  In the auto mode, the power transmission side control circuit intermittently performs temporary power transmission, and installs the power receiving side device depending on whether or not the ID authentication information from the power receiving device can be received within a predetermined time from the temporary power transmission start timing. Is detected. That is, if the power receiving device is set, when temporary power transmission is executed, there should be a response of ID authentication information within a predetermined time. Therefore, the installation of the power receiving device can be detected depending on whether the ID authentication information is returned within a predetermined time. Here, the temporary power transmission in the auto mode is power transmission performed before normal power transmission to the power receiving apparatus (power transmission in line with the original purpose of feeding the load), for example, intermittent power transmission.

  (5) In another aspect of the power transmission control device of the present invention, when the power transmission side control circuit detects a full charge notification from the power receiving device during the normal power transmission period, the power transmission control circuit stops the normal power transmission to the power transmission device. Power transmission for detection of removal after full charge and power transmission for determination of necessity of recharging after full charge, and from the power receiving apparatus that has received power transmission for detection of removal after full charge. When the removal is detected based on a signal sent, the power transmission device is returned to a state in which the intermittent temporary power transmission is executed, and the necessity for recharging after the full charge is determined. When it is determined that recharging is necessary based on a signal transmitted from the power receiving device that has received power transmission, the power transmission device is caused to resume the normal power transmission.

  In this aspect, after the load of the power receiving device becomes fully charged in the auto mode, the load state is further monitored to automatically manage recharging. That is, when the power receiving device remains set even after the battery is fully charged, the load (battery) may be discharged and recharging may be necessary if time elapses. Therefore, after the full charge is detected, the power transmission device performs power transmission instead of normal power transmission (may be intermittent power transmission or weak level continuous power transmission with different frequencies) to recharge the load. A negative decision is also made automatically, and power transmission is resumed when recharging is required. As a result, recharging of the load is automatically performed. Therefore, even when the power receiving device is left for a long time after full charging, the battery is always fully charged when the user uses the power receiving device. Therefore, there is no inconvenience that even though the battery is charged, the subsequent discharge results in an insufficient charge state, and therefore the user's expectation is not betrayed. However, if the power receiving device is removed after full charge, management of recharging is not necessary. Therefore, power transmission for removal detection after full charge (intermittent power transmission or weak level continuous power transmission with different frequencies described above) may also be executed. If there is no response from the power receiving side device that has received intermittent power transmission for removal detection, it can be determined that the power receiving side device has been removed. When the removal is detected, the power transmission side control circuit returns the power transmission device to the initial state. Note that the meaning of “full charge” described above can be broadly interpreted as, for example, “the load state on the power receiving device side is a predetermined state”. Therefore, the load is not limited to the battery. For example, a predetermined circuit of the power receiving device may be a load. That is, for example, “a state in which the predetermined circuit becomes unnecessary after receiving a power transmission from the power transmission device” corresponds to a case where the load is fully charged. Cases are also included in the technical scope of this embodiment.

  (6) In another aspect of the power transmission control device of the present invention, when the switch mode is selected by the operation mode switching control signal, the power transmission side control circuit is configured to operate the operation trigger switch provided in the power transmission side device. In order to enable the ID authentication process when the power is turned on, the power transmission device is caused to execute temporary power transmission to the power reception device, and the power reception that has received the temporary power transmission within a predetermined time from the start of the temporary power transmission. When receiving the ID authentication information from the device, the ID authentication processing is executed based on the ID authentication information, and after the ID authentication is successful, the power transmission device performs the normal power transmission to the power receiving device, When the ID authentication information from the power receiving apparatus cannot be received within the predetermined time from the start of power transmission, and when the ID authentication fails, the transmission Device, the control to return to the initial state to stop the temporary power transmission wait for on the operation trigger switch.

  In the switch mode, temporary power transmission from the power transmission side to the power reception side is started when the operation trigger switch provided in the power transmission side device is turned on (trigger generation by the switch). Here, “temporary power transmission in the switch-on mode” means power transmission before normal power transmission (for example, continuous power transmission) for enabling ID authentication. As usage forms of the operation trigger switch, for example, there are a case where the user turns on the operation trigger switch after setting the power receiving side device and a case where the power receiving side device is set after turning on the operation trigger switch. In either case, since the operation trigger switch is turned on by the user (that is, the user has a clear intention to start charging) as a condition for power transmission (including provisional power transmission), power transmission unexpectedly occurs without the user's knowledge. It is not started and the user's sense of security increases. Further, when the power receiving device is set, the operation trigger switch may be turned on by its own weight. In this case, it is possible to save the user from switching on. According to this configuration, it is not necessary to perform power transmission at all before the operation trigger switch is turned on (that is, it is not necessary to perform intermittent temporary power transmission for detecting a set of power receiving devices). By not performing unnecessary power transmission, it is possible to reduce power consumption and improve safety.

  (7) In another aspect of the power transmission control device of the present invention, when the power transmission side control circuit receives a full charge notification from the power receiving device after the start of the normal power transmission, the power transmission device performs the normal power transmission. Control is performed to return to the initial state of stopping and waiting for the operation trigger switch to be turned on.

  Since normal power transmission is stopped by a full charge notification (power transmission stop request in a broad sense) from the power receiving device, unnecessary power transmission does not occur, and accordingly, there is no fear of heat generation. Therefore, further improvement in safety is realized, and further reduction in power consumption is achieved.

  (8) In another aspect of the power transmission control device of the present invention, the power transmission side control circuit determines the presence or absence of a foreign object based on a change in the waveform of the induced voltage signal of the primary coil, and detects the foreign object during the normal power transmission. If it is, the power transmission device stops the normal power transmission.

  (9) In another aspect of the power transmission control device of the present invention, the power transmission side control circuit misidentifies a foreign object placed between the primary coil and the secondary coil as the power receiving side device, and A hijacking state in which normal power transmission continues is detected, and when a hijacking state is detected during the normal power transmission, the power transmission device stops the normal power transmission.

  During the normal power transmission period, the so-called “takeover state” is detected to further improve the safety and reliability of the contactless power transmission system. The “takeover state” is positioned as a special form of foreign object insertion, and is “a state in which normal power transmission is continued by misidentifying a foreign object as a power receiving device”. For example, when a thin metal plate is inserted so as to completely block between the primary coil and the secondary coil, a considerable amount of load is always present when viewed from the power transmission side. For example, removal detection is difficult. It becomes. That is, even after the power receiving side device is removed, the load corresponding to the power receiving side device is detected when viewed from the power transmission side, so that the removal cannot be detected. In this case, normal power transmission cannot be stopped. In this case, the metal plate reaches a high temperature and may cause abnormal heat generation, ignition, equipment damage, burns, and the like. Therefore, in addition to “foreign object detection” and “removal detection”, a “takeover detection” function is provided, and when a takeover state is detected, normal power transmission is immediately stopped. Thereby, the safety and reliability of the non-contact power transmission system can be further improved.

  (10) In another aspect of the power transmission control device of the present invention, the power transmission side control circuit detects an intermittent change in the load on the power reception device side as viewed from the power transmission device, and the load during the normal power transmission is detected. The takeover state is detected based on whether or not an intermittent change is detected.

  In the “takeover state”, signal transmission from the power receiving side to the power transmission side is blocked by foreign matter and cannot reach the power transmission side. Using this principle, a certain signal is transmitted from the power receiving side to the power transmission side, and the “takeover state” is detected based on whether or not the signal can be detected on the power receiving side. For example, depending on whether the power receiving device can send a signal (physical signal) to the power transmission side via the secondary coil and the primary coil by load modulation, and the signal (physical signal) can be detected on the power transmission side The hijacking state is determined. However, it is not limited to this method. For example, a light emitting means is provided on the power receiving side, a light receiving means is provided on the power transmission side, and the “takeover state” is detected depending on whether light (including infrared light or the like) from the power receiving side can be detected on the power transmission side. May be. You may detect whether external light (ambient light) reaches | attains a power transmission apparatus, without being interrupted by a foreign material. In addition to electrical signals and light, takeover detection may be performed depending on whether sound from the power receiving side can be detected at a predetermined level on the power transmission side.

  (11) Another aspect of the power transmission control device of the present invention is a power transmission control device provided in a power transmission device that transmits power to the power receiving device, and a first terminal to which a first signal is input; A power transmission control circuit that controls the power transmission device, and the power transmission control circuit includes a first operation mode or a second operation based on the first signal. In the first operation mode, the power transmission device automatically detects that the power reception device is present at a place where the power reception device can receive power. Power transmission is performed to supply power to an electrically connected load. In the second operation mode, the power transmission is performed after the second signal is input to the second terminal.

  The power transmission control device of this aspect is provided with a first terminal to which a first signal is input and a second terminal to which a second signal is input. In addition, a first operation mode and a second operation mode are prepared as operation modes. Whether to select the first operation mode or the second operation mode is determined by the first signal input to the first terminal. Since the operation mode can be switched, an easy-to-use power transmission system that can meet various needs is realized.

  In the first operation mode, the power transmission device automatically detects that the power reception device is present at a place where power can be received, and then supplies power to a load electrically connected to the power reception device. Transmit power. In the second mode, the power transmission device performs power transmission after the second signal is input to the second terminal.

  According to the first operation mode, it is detected that the power receiving device is placed in a position where power can be received and power transmission is automatically started, so that convenience and usability of the power transmission system are improved. Further, according to the second operation mode, the power transmission timing can be freely controlled by controlling the input timing of the second signal to the second terminal. In addition, before the second signal is input to the second terminal, power transmission by the power transmission device is not performed at all. Therefore, useless power consumption does not occur.

  (12) A power transmission device of the present invention includes the above power transmission control device and a power transmission unit that generates an alternating voltage and supplies the alternating voltage to the primary coil.

  As a result, a novel power transmission device capable of appropriately switching between the auto mode and the switch mode is realized.

  (13) One aspect of the electronic device of the present invention includes the above-described power transmission device, an operation mode switching switch for generating the operation mode switching control signal, and the operation trigger switch.

  For example, by providing an operation mode changeover switch, an operation trigger switch, and the above power transmission device in a charger (cradle) as a power transmission side device, the user can appropriately switch between the auto mode and the switch mode.

  (14) In another aspect of the electronic apparatus of the present invention, the operation mode changeover switch is provided at a place where a user can operate the operation mode changeover switch.

  As a result, the user can directly select either the switch mode or the auto mode by directly operating the operation mode switch. Therefore, the convenience of the non-contact power transmission system is improved.

  (15) In another aspect of the electronic apparatus of the present invention, the operation mode changeover switch is provided in a place where the user cannot operate.

  In this aspect, the user cannot directly operate the operation mode switch. In this aspect, for example, when the manufacturer ships the power transmission side device, it is determined whether or not to select the auto mode. This aspect is suitable, for example, when an unspecified number of users use a contactless power transmission system. That is, when the non-contact power transmission system is used for an unspecified number of uses, if the individual user selects the auto mode / switch mode, it may result in confusion. Therefore, for example, it is easier to obtain an understanding of the system when the manufacturer decides between the auto mode and the switch mode at the time of product shipment, and there is no confusion.

  (16) Another aspect of the electronic apparatus of the present invention includes a plurality of the operation mode changeover switches.

  By enriching the types of auto modes, it becomes possible to meet the needs of a wider variety of users. For example, in the first auto mode, a series of operations including automatic detection of power-receiving-side equipment installation, temporary power transmission, ID authentication, normal power transmission, removal and foreign object detection, full charge detection, and normal power transmission stop are automatically performed. . In the second auto mode, recharge management after full charge can be automatically performed.

  (17) One aspect of the contactless power transmission system of the present invention is a contactless power that transmits power from a power transmitting device to a power receiving device in a contactless manner via an electromagnetically coupled primary coil and secondary coil. In the transmission system, the power transmission device includes a power transmission side control device that controls power transmission to the power reception device based on an induced voltage of a primary coil, and the power transmission control device includes the power reception device. Auto mode that automatically detects the installation of, and starts normal power transmission through the ID authentication process, switch mode that starts power transmission when the operation trigger switch is turned on, and starts normal power transmission through the ID authentication process, An operation mode switching terminal for inputting an operation mode switching control signal for switching between the operation trigger terminal and an operation trigger terminal for receiving an operation trigger signal generated by operating the operation trigger switch And a power transmission side control circuit that controls power transmission to the power receiving device and switches the operation mode of the power transmitting device in response to the operation mode switching control signal, and the power receiving device supplies power to a load. And a power reception control device having a power reception side control circuit for controlling the power reception device, and the power transmission side control circuit of the power transmission device is configured so that the auto mode is set by the operation mode switching control signal. When selected, the intermittent power transmission is executed, and the power reception is performed depending on whether or not the ID authentication information from the power receiving apparatus that has received the temporary power transmission can be received within a predetermined time from the start of the temporary power transmission. When installation of a power receiving device having a device is detected and installation of the power receiving device is detected, the power transmission device is connected to the power transmission device on condition that the ID authentication process is successful. The normal power transmission is performed, and when the ID authentication information from the power receiving apparatus cannot be received within a predetermined time from the start of the temporary power transmission, and when the ID authentication fails, the power transmission apparatus is When the switch mode is selected by the operation mode switching control signal, the ID authentication process is enabled when the switch provided in the power transmission side device is turned on. Therefore, when the power transmission device executes temporary power transmission to the power receiving device and receives ID authentication information from the power receiving device that has received the temporary power transmission within a predetermined time from the start of the temporary power transmission, the ID Performing the ID authentication process based on authentication information, and after successfully performing the ID authentication, causing the power transmission device to execute the normal power transmission to the power reception device, When the ID authentication information from the power receiving device cannot be received within a predetermined time from the start of the temporary power transmission and when the ID authentication fails, the power transmission device is stopped and the switch Control to return to the initial state waiting for ON.

  As a result, it is possible to appropriately switch between the switch mode and the auto mode according to the customer's needs, and it is possible to provide a contactless power transmission technology that is highly convenient for the user and can reduce power consumption. . In addition, it is possible to provide a highly reliable contactless power transmission technology in which thorough safety measures are taken by ID authentication and foreign matter countermeasures.

  (18) In another aspect of the contactless power transmission system of the present invention, when the auto mode is selected by the operation mode switching control signal, the power transmission side control circuit performs the power reception device during the normal power transmission period. When detecting a full charge notification from the power transmission device, the power transmission device stops the normal power transmission, and performs power transmission for detection of removal after full charge and power transmission for necessity of recharging after full charge, When the removal is detected based on a signal sent from the power receiving device that has been transmitted for detection of removal after full charge, the power transmission device performs the intermittent temporary power transmission. When it is determined that recharging is necessary based on a signal transmitted from the power receiving device that has received power transmission for determining whether or not recharging is required after full charging, the power transmitting device Previous To resume the normal power transmission.

  Thereby, when the auto mode is selected, battery management after full charge can be performed fully automatically, and a more convenient non-contact power transmission system is realized.

  Thus, in at least one embodiment of the present invention, for example, it is possible to provide a non-contact power transmission technique that is highly convenient for the user and can reduce power consumption. In addition, at least one embodiment of the present invention can provide a highly reliable contactless power transmission technology with all safety measures taken.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below do not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiments are indispensable as means for solving the present invention. Not always.

(First embodiment)
FIG. 1A to FIG. 1C are diagrams illustrating an outline of a configuration example of a contactless power transmission system capable of switching between a switch mode and an auto mode. The contactless power transmission system of FIG. 1A is placed on a power transmission side device (for example, a charger (cradle)) 500 and a power transmission side device 500, and is connected to a secondary battery (battery) by contactless power transmission. ) To be charged (for example, a mobile phone terminal) 510. The power transmission device 500 incorporates the power transmission device 10. In addition, the power receiving device 510 incorporates the power receiving device 40. The power receiving device 40 may be attached to the power receiving side device 510 from the outside using an adapter or the like.

  The contactless power transmission system in FIG. 1A can switch between a switch mode and an auto mode. An operation trigger switch SW1 is provided at the end of the main surface of the power receiving side device 510, and an auto mode switch SW2 is provided on the side surface. The auto mode switch SW2 functions as an operation mode switching switch for switching the operation mode of the power transmission device 10. For example, mechanical momentary switches can be used as the switches SW1 and SW2. However, the present invention is not limited to this, and various switches such as a relay switch and a magnet type switch can be used.

  The “switch mode” is a mode in which the user can freely determine the start timing of power transmission / stop of power transmission by operating the operation trigger switch SW1. In the switch mode, when full charge is detected, normal power transmission by the power transmission device 10 automatically stops and returns to an initial state (a state in which the operation trigger switch SW1 is turned on). Further, when the user presses the operation trigger switch SW1 during normal power transmission, the normal power transmission by the power transmission device 10 is forcibly stopped, and the state returns to the initial state (a state in which the operation trigger switch SW1 is turned on).

  On the other hand, in the “auto mode”, when the user places the power receiving side device 510 on the power transmitting side device 500, the power transmitting device 10 automatically detects the installation of the power receiving side device 510, for example, temporary power transmission, ID authentication, This is a fully automatic mode that automatically performs a series of operations such as normal power transmission, removal and detection of foreign matter, detection of full charge, and stop of normal power transmission. Further, after full charge is detected and normal power transmission is stopped, it is also possible to automatically execute determination of whether or not recharge is necessary, start of recharge, and removal detection after full charge.

  In the non-contact power transmission system of FIG. 1A, the user can freely select either the switch mode or the auto mode. The auto mode switch SW2 functions as an operation mode switch for switching on / off of the auto mode. When the auto mode is selected by the auto mode switch SW2, the power transmission control device (power transmission control IC) 20 enters the auto mode. If auto mode is not selected, switch mode is activated instead. When the auto mode is selected, the operation trigger switch SW1 is invalidated, and even if the operation trigger switch SW1 is pressed, the operation of the power transmission device 10 is not affected.

  On the other hand, when the auto mode is not selected (when the auto mode is canceled), the switch mode is automatically selected instead. When the switch mode is selected, the operation trigger switch SW1 is validated, and the power transmission device 10 repeats the start of power transmission or the end of power transmission every time the user presses the operation trigger switch SW1 once.

  In the auto mode, the user only has to set the power receiving side device 510 on the power transmitting side device 500, no switch operation or the like is necessary, there is no burden on the user, and the convenience and usability of the system are improved.

  On the other hand, in the switch mode, the user can independently determine the timing of transmission start / stop, so that the user can use the system as desired. Realized. In the switch mode, no power is transmitted until the user turns on the operation trigger switch SW1. Further, when full charge is detected, normal power transmission stops and returns to the initial state. Therefore, no power transmission is performed until the operation trigger switch SW1 is pressed again. Therefore, there is no wasteful power consumption and power saving is possible.

  In the non-contact power transmission system of FIG. 1B, the auto mode switch SW <b> 2 is built in the power transmission side device 500. That is, in the system of FIG. 1B, for example, when the manufacturer ships the power transmission side device 500, it is determined whether or not to select the auto mode. If the auto mode is selected, a manufacturer worker operates the auto mode switch SW2 to activate the auto mode. In actual use scenes, the user cannot switch auto mode selection / non-selection. The system in FIG. 1B is suitable when, for example, an unspecified number of users use the system. In other words, when the system is used for an indefinite number of uses, if the individual user selects the auto mode / switch mode, confusion may result. Therefore, for example, it is easier to obtain an understanding of the system when the manufacturer decides between the auto mode and the switch mode at the time of product shipment, and there is no confusion.

  The contactless power transmission system in FIG. 1C is a modification of the system in FIG. In the system of FIG. 1C, two auto mode switches are prepared. That is, the first auto mode switch SW2a and the second auto mode switch SW2b are provided on both side surfaces of the power transmission side device 500, respectively. That is, in the system of FIG. 1C, the type of auto mode can be selected.

  The auto mode selected by the first auto mode switch SW2a is, for example, automatic detection of installation of the power receiving side device 510, temporary power transmission, ID authentication, normal power transmission, removal or foreign object detection, full charge detection, normal power transmission In this mode, a series of stop operations are performed fully automatically. The auto mode selected by the second auto mode switch SW2b is a mode for automatically performing recharge management after full charge. For example, when the second auto mode is selected by the second auto mode switch SW2b, the power transmission device 10 automatically detects installation of the power receiving side device 510, temporary power transmission, ID authentication, normal power transmission, removal, and detection of foreign matter. A series of operations including automatically detecting full charge, stopping normal power transmission, determining whether recharge after full charge is necessary, starting recharge and removal after full charge are automatically executed.

  A user who plans to use the power receiving device 510 immediately after full charging turns on the first auto mode switch SW2a when using the auto mode. A user who plans to leave the power receiving device 510 for a long time turns on the second auto mode switch SW2b. Thus, the type of auto mode can be properly used according to the user's usage mode. Note that the type of auto mode is not limited to the above example. Three or more types of auto modes may be provided, and the number of auto mode switches may be increased accordingly. It is also possible to provide an auto mode in which only recharge monitoring after full charge is performed. That is, the auto mode corresponding to the second auto mode switch SW2b may be an auto mode specialized for recharge management after full charge. For example, a user who plans to leave the mobile terminal for a long period of time sets the mobile terminal on the power transmission side device 500 and turns on the second auto mode switch SW2b. When the battery of the mobile terminal is discharged and needs to be recharged, the mobile terminal is automatically recharged. Therefore, the battery of the mobile terminal can always be kept fully charged.

  Next, an example of a suitable electronic device to which the present invention is applied and the principle of contactless power transmission technology will be described.

(Examples of electronic devices and the principle of contactless power transmission)
2A to 2C are diagrams for explaining an example of an electronic device to which a contactless power transmission method is applied and a principle of contactless power transmission using an induction transformer.
As shown in FIGS. 2A and 2B, a charger (cradle) 500 that is a power transmission side electronic device is a power transmission device (a power transmission module including a power transmission side control circuit (power transmission side control IC)). 10

  Further, the charger (cradle) 500 is lit when power is transmitted from the operation trigger switch SW1, an auto mode switch SW2, and a charger that gives an opportunity (trigger, trigger) to start or stop transmission. And a display unit (LED or the like) 16 that can identify the auto mode / switch mode by changing.

  In the charger (cradle) 500 of FIG. 2A, the operation trigger switch SW1 is provided outside the area where the power receiving side electronic device (mobile phone terminal) 510 is mounted. A user who wants to charge the mobile phone terminal 510 presses the operation trigger switch SW1 while the auto mode is not selected. Then, using this as a trigger (trigger), power transmission from the power transmission device 10 (temporary power transmission for position detection and ID authentication) is started. Further, when the operation trigger switch SW1 is pressed during power transmission (including provisional power transmission and normal power transmission), power transmission is forcibly stopped.

  In the charger (cradle) 500 of FIG. 2B, the operation trigger switch SW1 is provided in a region where the power receiving side device (cellular phone terminal) 510 is mounted. Therefore, when the mobile phone terminal 510 is placed on the charger (cradle) 500, the operation trigger switch SW1 is automatically pressed (turned on) by the dead weight of the charger (cradle) 500. With this as an opportunity, power transmission from the charger (cradle) 500 (temporary power transmission for performing position detection and ID authentication) is started. Further, when the operation trigger switch SW1 is pressed again during power transmission (including temporary power transmission and normal power transmission) (for example, after the mobile phone terminal 510 is lifted, the operation trigger switch SW1 is installed again). Power transmission is forcibly stopped.

  In the case of FIG. 2B as well, in the same way as in FIG. 2A, the operation trigger switch SW1 has a role of giving an opportunity to start power transmission, in order to detect the presence of the mobile phone terminal 510. It is not used (removal of the cellular phone terminal 510 is basically determined based on the induced voltage of the primary coil: described later). However, this does not exclude that the operation trigger switch SW1 also has a function of detecting the presence of the mobile phone terminal 510.

  The mobile phone terminal 510 which is a power receiving device includes a power receiving device (power receiving module including a power receiving control circuit (power receiving control IC)) 40. The mobile phone terminal 510 includes a display unit 512 such as an LCD, an operation unit 514 including buttons and the like, a microphone 516 (sound input unit), a speaker 518 (sound output unit), and an antenna 520.

  The charger 500 is supplied with power via the AC adapter 502. This electric power is transmitted from the power transmitting device 10 to the power receiving device 40 by contactless power transmission. Thereby, the battery of the mobile phone terminal 510 can be charged, or the device in the mobile phone terminal 510 can be operated.

  As schematically shown in FIG. 2C, power transmission from the power transmission device 10 to the power reception device 40 is performed on the primary coil L1 (power transmission coil) provided on the power transmission device 10 side and on the power reception device 40 side. This is realized by electromagnetically coupling the secondary coil L2 (power receiving coil) formed to form a power transmission transformer. Thereby, non-contact power transmission becomes possible.

  Note that the electronic apparatus to which this embodiment is applied is not limited to the mobile phone terminal 510. For example, the present invention can be applied to various electronic devices such as wristwatches, cordless telephones, shavers, electric toothbrushes, wrist computers, handy terminals, portable information terminals, and electric bicycles.

  Examples of particularly suitable electronic devices include mobile terminals (including mobile phone terminals, PDA terminals, portable personal computer terminals) and watches (watches). Since the power receiving device of the present invention is simple in configuration and small in size, it can be mounted on a portable terminal or the like and has low loss. For example, the charging time of a secondary battery in an electronic device can be shortened. In addition, since the heat generation is reduced, the reliability of the electronic device from the viewpoint of safety is also improved.

  In particular, mobile terminals (including mobile phone terminals, PDA terminals, and portable personal computer terminals) have a large amount of charging current at high loads, and the problem of heat generation is likely to become obvious. Therefore, it can be said that the present invention can fully utilize the low loss and low heat generation characteristics of the present invention.

(Internal configuration example of power transmission device and power reception device)
FIG. 3 is a circuit diagram illustrating an example of a specific configuration of each unit in a contactless power transmission system including a power transmission device and a power reception device. As illustrated, the power transmission device 10 includes a power transmission control device 20, a power transmission unit 12, a waveform monitor circuit 14, an operation trigger switch SW1, and an auto mode switch SW2. The power transmission control device 20 includes a power transmission side control circuit 22, an oscillation circuit 24, a driver control circuit 26, and a waveform detection circuit 28.

  In addition, the power receiving device 40 includes a power receiving unit 42, a load modulation unit 46, a power supply control unit 48, and a power reception control device 50. The load 90 includes a charge control device 92 and a battery (secondary battery) 94. This will be specifically described below. The electronic device on the power transmission side such as the charger 500 includes at least the power transmission device 10 shown in FIG. In addition, the electronic device on the power receiving side such as the mobile phone terminal 510 includes at least the power receiving device 40 and the load 90. 3, the primary coil L1 and the secondary coil L2 are electromagnetically coupled to transmit power from the power transmission apparatus 10 to the power reception apparatus 40, and the load 90 from the voltage output node NB6 of the power reception apparatus 40. Thus, a non-contact power transmission (non-contact power transmission) system that supplies power (voltage VOUT) to the power source is realized.

  The power transmission device 10 (power transmission module, primary module) can include a primary coil L1, a power transmission unit 12, a waveform monitor circuit 14, a display unit 16, and a power transmission control device 20. The power transmission device 10 and the power transmission control device 20 are not limited to the configuration shown in FIG. 3, and some of the components (for example, the display unit and the waveform monitor circuit) are omitted, other components are added, and the connection is made. Various modifications such as changing the relationship are possible. The power transmission unit 12 generates an AC voltage having a predetermined frequency during power transmission, and generates an AC voltage having a different frequency according to data during data transfer, and supplies the AC voltage to the primary coil L1.

  4A and 4B are diagrams for explaining an example of the principle of information transmission between the power transmission side device and the power reception side device. Frequency modulation is used for information transmission from the primary side to the secondary side. Also, load modulation is used for information transmission from the secondary side to the primary side. As shown in FIG. 4A, for example, when data “1” is transmitted from the power transmitting apparatus 10 to the power receiving apparatus 40, an alternating voltage of frequency f1 is generated and data “0” is transmitted. In this case, an AC voltage having a frequency f2 is generated. Also, as shown in FIG. 4B, the power receiving device 40 can switch between a low load state and a high load state by load modulation, whereby “0” and “1” are switched to the primary side (power transmission device). 10).

  Returning to FIG. 3, the description will be continued. 3 constitutes a resonance circuit together with the first power transmission driver that drives one end of the primary coil L1, the second power transmission driver that drives the other end of the primary coil L1, and the primary coil L1. At least one capacitor. Each of the first and second power transmission drivers included in the power transmission unit 12 is, for example, an inverter circuit (or buffer circuit) configured by a power MOS transistor, and is controlled by the driver control circuit 26 of the power transmission control device 20. The

  The primary coil L1 (power transmission side coil) is electromagnetically coupled to the secondary coil L2 (power reception side coil) to form a power transmission transformer. For example, when power transmission is required, as shown in FIG. 1, the mobile phone terminal 510 is placed on the charger 500 so that the magnetic flux of the primary coil L1 passes through the secondary coil L2. On the other hand, when power transmission is unnecessary, the charger 500 and the mobile phone terminal 510 are physically separated so that the magnetic flux of the primary coil L1 does not pass through the secondary coil L2.

  The waveform monitor circuit 14 is a circuit that detects an induced voltage of the primary coil L1, and is, for example, between resistors RA1 and RA2 or a connection node NA3 between RA1 and RA2 and GND (low-potential side power supply in a broad sense). It includes a provided diode DA1. Specifically, a signal PHIN obtained by dividing the induced voltage of the primary coil by the resistors RA1 and RA2 is input to the waveform detection circuit 28 of the power transmission control device 20.

  The display unit 16 displays various states of the contactless power transmission system (during power transmission, ID authentication, etc.) using colors, images, and the like. For example, an LED (light emitting diode) or LCD (liquid crystal display device). And so on.

  The power transmission control device 20 is a device that performs various controls of the power transmission device 10, and can be realized by an integrated circuit device (IC) or the like. The power transmission control device 20 includes a power transmission side control circuit 22, an oscillation circuit 24, a driver control circuit 26, and a waveform detection circuit 28.

  The power transmission side control circuit 22 controls the power transmission device 10 and the power transmission control device 20, and can be realized by, for example, a gate array or a microcomputer.

  Specifically, the power transmission side control circuit 22 performs various sequence controls and determination processes necessary for power transmission, load detection, frequency modulation, foreign object detection, and attachment / detachment detection. As described above, the power transmission side control circuit 22 starts temporary power transmission for position detection and ID authentication to the power receiving device 40 when the switch (SW) is turned on (described later).

  The oscillation circuit 24 is composed of, for example, a crystal oscillation circuit and generates a primary side clock. The driver control circuit 26 generates a control signal having a desired frequency based on the clock generated by the oscillation circuit 24, the frequency setting signal from the control circuit 22, and the like, and outputs the control signal to a power transmission driver (not shown) of the power transmission unit 12. Then, the operation of the power transmission driver is controlled.

  The waveform detection circuit 28 monitors the waveform of the signal PHIN corresponding to the induced voltage at one end of the primary coil L1, and performs load detection, foreign object detection, and the like. For example, when the load modulation unit 46 of the power receiving device 40 performs load modulation for transmitting data to the power transmission device 10, the signal waveform of the induced voltage of the primary coil L1 changes correspondingly.

  Specifically, for example, as illustrated in FIG. 4B, when the load modulation unit 46 of the power receiving device 40 decreases the load to transmit data “0”, the amplitude (peak voltage) of the signal waveform decreases. Thus, when the load is increased in order to transmit the data “1”, the amplitude of the signal waveform increases. Therefore, the waveform detection circuit 28 performs peak hold processing of the signal waveform of the induced voltage and determines whether or not the peak voltage exceeds the threshold voltage, whereby the data from the power receiving device 40 is “0”. Whether it is “1” or not. Note that the method of waveform detection is not limited to the above-described method. For example, whether the load on the power receiving side has increased or decreased may be determined using a physical quantity other than the peak voltage.

  The power reception device 40 (power reception module, secondary module) can include a secondary coil L2, a power reception unit 42, a load modulation unit 46, a power supply control unit 48, and a power reception control device 50. Note that the power reception device 40 and the power reception control device 50 are not limited to the configuration in FIG. 3, and various modifications such as omitting some of the components, adding other components, and changing the connection relationship. Implementation is possible.

  The power receiving unit 42 converts the AC induced voltage of the secondary coil L2 into a DC voltage. This conversion is performed by a rectifier circuit 43 included in the power receiving unit 42. The rectifier circuit 43 includes diodes DB1 to DB4. The diode DB1 is provided between the node NB1 at one end of the secondary coil L2 and the generation node NB3 of the DC voltage VDC, and DB2 is provided between the node NB3 and the node NB2 at the other end of the secondary coil L2. , DB3 is provided between the node NB2 and the VSS node NB4, and DB4 is provided between the nodes NB4 and NB1.

  The resistors RB1 and RB2 of the power receiving unit 42 are provided between the nodes NB1 and NB4. A signal CCMPI obtained by dividing the voltage between the nodes NB1 and NB4 by the resistors RB1 and RB2 is input to the frequency detection circuit 60 of the power reception control device 50.

  The capacitor CB1 and the resistors RB4 and RB5 of the power receiving unit 42 are provided between the node NB3 of the DC voltage VDC and the node NB4 of VSS. A divided voltage VD4 obtained by dividing the voltage between the nodes NB3 and NB4 by the resistors RB4 and RB5 is input to the power receiving side control circuit 52 and the position detection circuit 56 via the signal line LP2. As for the position detection circuit 56, the divided voltage VD4 serves as a signal input (ADIN) for position detection.

  The load modulation unit 46 performs load modulation processing. Specifically, when transmitting desired data from the power receiving device 40 to the power transmitting device 10, the load at the load modulation unit 46 (secondary side) is variably changed according to the transmission data, and the primary coil L1 The signal waveform of the induced voltage is changed. For this purpose, the load modulation unit 46 includes a resistor RB3 and a transistor TB3 (N-type CMOS transistor) provided in series between the nodes NB3 and NB4.

  This transistor TB3 is ON / OFF controlled by a control signal P3Q given from the power reception side control circuit 52 of the power reception control device 50 via the signal line LP3. In the authentication stage before normal power transmission is started, when the transistor TB3 is on / off controlled to perform load modulation to transmit a signal to the power transmission device, the transistor TB2 of the power supply control unit 48 is turned off, and the load 90 is not electrically connected to the power receiving device 40.

  For example, when the secondary side is set to a low load (high impedance) in order to transmit data “0”, the signal P3Q becomes L level and the transistor TB3 is turned off. As a result, the load of the load modulator 46 becomes almost infinite (no load). On the other hand, when the secondary side is set to a high load (low impedance) in order to transmit data “1”, the signal P3Q becomes H level and the transistor TB3 is turned on. As a result, the load of the load modulation unit 46 becomes the resistance RB3 (high load).

  The power supply control unit 48 controls power supply to the load 90. The regulator (LDO) 49 adjusts the voltage level of the DC voltage VDC obtained by the conversion in the rectifier circuit 43, and generates a power supply voltage VD5 (for example, 5V). The power reception control device 50 operates by being supplied with the power supply voltage VD5, for example.

  Further, a switch circuit composed of a PMOS transistor (M1) is provided between the input terminal and the output terminal of the regulator (LDO) 49. By turning on the PMOS transistor (M1) as the switch circuit, a path bypassing the regulator (LDO) 49 is formed. For example, at the time of high load (for example, in the initial stage of charging of a rechargeable secondary battery, it is necessary to constantly flow a substantially constant large current, and such time corresponds to the time of high load) Since the power loss increases and the heat generation increases due to the equivalent impedance of the regulator 49 itself, the regulator is bypassed and current is supplied to the load via the bypass path.

  In order to control on / off of the PMOS transistor (M1) as the switch circuit, an NMOS transistor (M2) functioning as a bypass control circuit and a pull-up resistor R8 are provided.

  When a high-level control signal is applied from the power receiving side control circuit 52 to the gate of the NMOS transistor (M2) via the signal line LP4, the NMOS transistor (M2) is turned on. Then, the gate of the PMOS transistor (M1) becomes low level, the PMOS transistor (M1) is turned on, and a path for bypassing the regulator (LDO) 49 is formed. On the other hand, when the NMOS transistor (M2) is in the off state, the gate of the PMOS transistor (M1) is maintained at the high level via the pull-up resistor R8, so the PMOS transistor (M1) is turned off and the bypass path is Not formed.

  On / off of the NMOS transistor (M2) is controlled by a power reception side control circuit 52 included in the power reception control device 50.

  The transistor TB2 (P-type CMOS transistor) is provided between the generation node NB5 (output node of the regulator 49) of the power supply voltage VD5 and the node NB6 (voltage output node of the power receiving device 40). Is controlled by a signal P1Q from the power receiving side control circuit 52. Specifically, the transistor TB2 is turned on when the ID authentication is completed (established) and normal power transmission (ie, normal power transmission) is performed.

  A pull-up resistor RU2 is provided between the power supply voltage generation node NB5 and the node NB8 of the gate of the transistor TB2.

  The power reception control device 50 is a device that performs various controls of the power reception device 40 and can be realized by an integrated circuit device (IC) or the like. The power reception control device 50 can be operated by a power supply voltage VD5 generated from the induced voltage of the secondary coil L2. The power reception control device 50 can include a control circuit 52 (power reception side), a position detection circuit 56, an oscillation circuit 58, a frequency detection circuit 60, a full charge detection circuit 62, and a recharge monitoring circuit 64.

  The power receiving side control circuit 52 controls the power receiving device 40 and the power receiving control device 50, and can be realized by, for example, a gate array or a microcomputer. The power receiving side control circuit 52 operates using the constant voltage (VD5) at the output terminal of the series regulator (LDO) 49 as a power source. This power supply voltage (VD5) is given to the power receiving side control circuit 52 via the power supply line LP1.

  Specifically, the power receiving side control circuit 52 enables ID authentication, position detection, frequency detection, full charge detection, recharge necessity determination, load modulation for authentication communication, and foreign object insertion detection. Various sequence control and determination processes necessary for load modulation for communication are performed.

  The position detection circuit 56 monitors the waveform of the signal ADIN corresponding to the waveform of the induced voltage of the secondary coil L2, and determines whether the positional relationship between the primary coil L1 and the secondary coil L2 is appropriate.

  Specifically, the signal ADIN is converted into a binary value by a comparator, and it is determined whether or not the positional relationship is appropriate.

  The oscillation circuit 58 is constituted by a CR oscillation circuit, for example, and generates a secondary clock. The frequency detection circuit 60 detects the frequency (f1, f2) of the signal CCMPI and determines whether the transmission data from the power transmission device 10 is “1” or “0”.

  The full charge detection circuit 62 (charge detection circuit) is a circuit that detects whether or not the battery 94 of the load 90 is in a fully charged state (charged state). Specifically, the full charge detection circuit 62 detects the full charge state by detecting on / off of the LEDR used for displaying the charge state, for example. That is, when the LEDR is extinguished continuously for a predetermined time (for example, 5 seconds), it is determined that the battery 94 is fully charged (charging is completed).

  Further, when the power receiving side device 510 is left on the cradle 500 for a long time after full charge, the voltage of the battery voltage VBAT decreases due to discharge. The recharge monitoring circuit 64 determines whether or not recharging is necessary based on the battery voltage VBAT. That is, the recharge monitoring circuit 64 determines that recharge is necessary, for example, when the battery voltage VBAT is lower than the threshold voltage.

  The load 90 includes a charge control device 92 that performs charge control of the battery 94 and the like. The charging control device 92 can detect the fully charged state based on the lighting state of the light emitting device (LEDR). The charge control device 92 (charge control IC) can be realized by an integrated circuit device or the like. Note that, like a smart battery, the battery 94 itself may have the function of the charging control device 92. The load 90 is not limited to the secondary battery. For example, when a predetermined circuit operates, the circuit may become a load.

(Installation mode of operation trigger switch and auto mode switch)
5 to 7 are diagrams illustrating specific installation examples of the operation trigger switch and the auto mode switch. FIG. 5 shows an internal configuration of the power transmission device 10 in the system of FIG.

  In FIG. 5, a power transmission control device (power transmission control IC) 20 has two terminals, an operation trigger input terminal SWONX and an auto mode terminal AUTO. One end of the operation trigger switch SW1 is connected to the operation trigger input terminal SWONX. One end of the operation trigger switch SW1 is pulled up by a pull-up resistor RX. Therefore, if the operation trigger switch SW1 is in the open state, the operation trigger input terminal SWONX is maintained at the H level. The other end of the operation trigger switch SW1 is grounded. Therefore, when the operation trigger switch SW1 is closed, the operation trigger input terminal SWONX changes to the L level. For each negative edge NT of the operation trigger, the power transmission side control circuit 22 repeats the stop of power transmission / power transmission.

  Further, one end of the auto mode terminal SW2 is connected to the auto mode terminal AUTO. One end of the auto mode switch SW2 is pulled up by a pull-up resistor RY1. Therefore, if the auto mode switch SW2 is open, the auto mode terminal AUTO is maintained at the H level. The other end of the auto mode switch SW2 is grounded. Therefore, when the auto mode switch SW2 is in the closed state, the auto mode terminal AUTO becomes L level. When the auto mode terminal AUTO is at the H level, the power transmission side control circuit 22 enters the auto mode, and a series of automatic installation detection, temporary power transmission, ID authentication, normal power transmission, removal detection, foreign object detection, full charge detection, normal power transmission off, etc. The operation is executed fully automatically. When the auto mode terminal AUTO is at L level, the auto mode is turned off. When the auto mode is off, the operation trigger mode is active. Therefore, the input of the negative edge NT from the operation trigger switch SW1 becomes valid, and the power transmission side control circuit 22 repeats the stop of power transmission / power transmission for each input of the negative edge NT as described above.

  In FIG. 5, the operation trigger switch SW 1 and the pull-up resistor RX constitute an operation trigger circuit 3. The operation trigger circuit 3 serves to give an operation trigger for instructing the power transmission control device (power transmission control IC) 20 to stop power transmission / power transmission when the auto mode is inactive. The auto mode switch SW2 and the pull-up resistor RY1 constitute an auto mode circuit 5. The auto mode circuit 5 functions as an operation mode switching circuit for switching on / off of the auto mode. That is, when the output of the auto mode circuit 5 is at the H level, the power transmission control device (power transmission control IC) 20 is in the auto mode. When the output is at the L level, the auto mode is canceled and the switch mode is activated instead. .

  FIG. 6 shows an internal configuration of the power transmission device 10 in the system of FIG. In FIG. 6, the auto mode circuit 5 (including the auto mode switch SW <b> 2) is provided inside the power transmission device 10. Selection of the auto mode by the auto mode circuit 5 is performed by a manufacturer worker at the time of product shipment, for example.

  FIG. 7 shows an internal configuration of the power transmission device 10 in the system of FIG. In FIG. 7, the auto mode circuit 5 includes a first auto mode switch SW2a and a second auto mode switch SW2b. As described above, when the first auto mode switch SW2a is on, the power transmission side control circuit 22 performs, for example, automatic detection of installation of the power receiving side device 510, provisional power transmission, ID authentication, normal power transmission, removal, detection of foreign matter, A series of operations of full charge detection and normal power transmission stop is executed automatically. In addition, when the second auto mode switch SW2b is on, the power transmission side control circuit 22 automatically detects installation of the power receiving side device 510, temporary power transmission, ID authentication, normal power transmission, removal or foreign object detection, full charge detection. In addition, a series of operations including automatic power transmission stop, determination of necessity of recharging after full charge, start of recharge and removal detection after full charge are automatically executed. Note that the power transmission control device (power transmission control IC) 20 of FIG. 7 is provided with two auto mode terminals (AUTO1, AUTO2).

(Second Embodiment)
In the present embodiment, the operation of the non-contact power transmission system when the auto mode is selected will be described.

(Outline of operation of power transmission device in auto mode)
FIG. 8 is a flowchart showing an outline of an example of the operation of the power transmission device in the auto mode. As described above, the power transmission side control circuit 22 of the power transmission device 10 of the present invention can automatically detect the installation of the power receiving side device 510 and can also execute recharge management after full charge. Thus, an operation mode in which the power transmission device 10 automatically executes a series of operations is referred to as an auto mode.

  8, the operation of the power transmission apparatus 10 in the auto mode includes “installation detection and confirmation of power transmission target (step SA)” and “confirmation of power transmission environment during normal power transmission (step SB). ) ”,“ Full charge detection (step SC) ”, and“ monitoring after full charge (step SD) ”. Hereinafter, it demonstrates in order.

  When the power is turned on (step S0), installation detection and confirmation of a power transmission target (step SA) are executed. This step SA includes steps S1 to S4. Through steps S1 and S2, the power transmission device 10 automatically and intermittently drives the primary coil L1 at a predetermined cycle (for example, 0.3 seconds) to execute intermittent temporary power transmission. Next, it is confirmed whether the set position of the power receiving side device 510 is appropriate (step S3), and ID authentication of the power receiving side device 510 (or the power receiving device 40) is executed to determine whether or not the power receiving side device 510 is an appropriate power transmission target. Is determined (step S4).

  If the power receiving device 40 succeeds in position detection (step S3), the ID authentication information is transmitted to the power transmitting device 10 within a predetermined time. The power receiving apparatus 10 detects the installation of the power receiving side device 510 depending on whether or not the ID authentication information from the power receiving apparatus is returned within a predetermined time from the timing of intermittent temporary power transmission. When the installation of the power receiving side device 510 cannot be detected, or when the ID authentication (step S4) fails (step S5), the temporary power transmission is stopped and the temporary power transmission is intermittently returned to the initial state (initial state). .

  The above-described position detection (step S3) is determined based on, for example, a DC voltage (ADIN) obtained by rectifying the induced voltage of the secondary coil (L2) by the position detection circuit 56 in the power receiving device 40 of FIG. To do. FIG. 16 is a diagram for explaining the principle of position detection. As shown in FIG. 16, the voltage level of ADIN changes according to the positional relationship between the primary coil (L1) and the secondary coil (L2).

  For example, when the set position of the power receiving device is inappropriate, a DC voltage (ADIN) of a predetermined level (V3 level) cannot be obtained, so that it is determined that the position is inappropriate, and the position detection result is transmitted from the power receiving device 40 to the power transmitting device. 10 can be transmitted using, for example, load modulation. Further, the power receiving device 40 may transmit the position mismatch by not transmitting the ID authentication information to the power transmitting device 10 within a predetermined time after receiving the temporary power transmission.

  Returning to FIG. In FIG. 8, when the ID authentication (step S4) is successful, normal power transmission is started (step S6). During normal power transmission, the power transmission device 10 performs detection of a metallic foreign object (step S7) and detection of a takeover state by periodic load fluctuation detection (steps S8 and S9). Further, removal (leave) detection of the power receiving side device 510 is also executed (step S10). When any of the metallic foreign object, the takeover state, and the removal is detected (step S11), the normal power transmission is stopped (step S12), and the process returns to step S1 (step for performing automatic intermittent operation).

  Metal foreign matter detection (step S7) and removal detection (step S10) can be detected based on the waveform change of the induced voltage signal of the primary coil (L1). This will be specifically described below.

  FIG. 17A to FIG. 17F are diagrams for explaining the principle of metal foreign matter (conductive foreign matter) detection. FIG. 17B to FIG. 17F each show an induced voltage signal of the primary coil L1 shown in FIG. 17A according to the relative position between the primary coil and the metal foreign matter (conductive foreign matter) MET. It shows how (V (NA2)) changes. As shown in the figure, in the state where there is no metallic foreign matter (MET) (FIG. 17F) and the state where the metallic foreign matter (MET) exists (FIGS. 17B to 17E), V The waveform (amplitude) of (NA2) is clearly different. Therefore, metal foreign matter (MET) can be detected by monitoring the waveform of the induced voltage signal V (NA2) of the primary coil (L1) by the waveform monitor circuit 14 (see FIG. 3). Note that “monitoring the waveform” includes not only the case of monitoring the amplitude but also the case of monitoring the phase of current and voltage, for example.

  18A to 18D are diagrams for explaining the principle of removal detection. As shown in FIG. 18 (A), when the power receiving side device 510 is set, the waveform of the induced voltage signal V (NA2) of the primary coil (L1) is as shown in FIG. 18 (B). . On the other hand, as shown in FIG. 18C, when the power receiving device 510 is removed (during leave), the waveform of the induced voltage signal V (NA2) of the primary coil (L1) is as shown in FIG. D), and its waveform (amplitude) is clearly distinguished from the waveform of FIG. Therefore, the removal (leave) can be detected by monitoring the waveform of the induced voltage signal V (NA2) of the primary coil (L1) by the waveform monitor circuit 14 (see FIG. 3).

  In addition, the detection of the hijacking state (step S9 in FIG. 8) can be detected based on whether an intermittent (for example, periodic) load modulation signal on the power receiving side can be detected on the power transmitting side (this point is Will be described later).

  Returning to FIG. In FIG. 8, when the power transmission side control circuit 22 of the power transmission device 10 detects a full charge notification sent from the power reception device 40 indicating the full charge of the battery (step S13), it turns off normal power transmission (step S14). ), The process proceeds to the monitoring step (step SD) after full power reception.

  The full charge of the battery 94 is detected by the full charge detection circuit 62 included in the power receiving device 40 of FIG. When the full charge is detected, the power receiving side control circuit 52 included in the power receiving device 40 transmits a full charge notification toward the power transmitting device 10. When detecting the full charge notification from the power receiving device 40, the power transmission side control circuit 22 of the power transmitting device 10 executes the monitoring step (step SD) after full power reception as described above.

  The monitoring step after full charge (step SD) is a step for executing intermittent power transmission with period T1 (step S15) and a removal detection step (step S16) for detecting removal after full charge, and for detecting whether or not recharging is necessary. The step of executing intermittent power transmission of period T2 (step S17) and the recharge request detecting step (step S18) are included. Thus, after the load (battery) 94 of the power receiving device 510 is fully charged, the load state can be monitored and recharging can be automatically resumed.

  That is, if the power receiving device 510 remains set after being fully charged, the load (battery) 94 may be discharged and need to be recharged as time elapses. Therefore, after full charge is detected, intermittent power transmission with an appropriate period is executed instead of normal power transmission, and the necessity of recharging the load is automatically determined. The power transmission (step S6) is resumed. Thereby, recharging of the load (battery) 94 is automatically executed. Therefore, even when the power receiving device 510 is left for a long time after full charging, the load (battery) 94 is always in a fully charged state when the user uses the power receiving device 510. Therefore, there is no inconvenience that even though the battery is charged, the subsequent discharge results in an insufficient charge state, and therefore the user's expectation is not betrayed.

  However, if the power receiving device is removed after full charge, management of recharging is not necessary. Therefore, it is preferable to execute intermittent power transmission for detecting removal after full charging, separately from intermittent power transmission for managing recharging (step S15). For example, if there is no response from the power receiving side device 510 that has received intermittent power transmission for removal detection, it can be determined that the power receiving side device 510 has been removed. When the removal is detected, the power transmission side control circuit 22 included in the power transmission device 10 returns to an initial state (a state in which intermittent temporary power transmission is performed). Further, the intermittent power transmission for removal detection and the intermittent power transmission for recharge management do not need to be performed so frequently, and are desirably performed at an appropriate cycle so as not to increase power consumption unnecessarily. Therefore, intermittent power transmission for removal detection is performed in the first period T10, and intermittent power transmission for recharging management is performed in the second period T20.

  The reason why the first period T10 and the second period T20 are distinguished from each other is that it is desirable to optimize the period in accordance with each purpose. However, the first cycle T10 and the second cycle T20 may be the same. Note that the meaning of “full charge” described above can be interpreted in a broad sense, for example, “the load state on the power receiving device 40 side is a predetermined state”. Therefore, the load is not limited to the battery. For example, a predetermined circuit of the power receiving device 510 may be a load. That is, for example, “the state in which the predetermined circuit becomes unnecessary after receiving a power transmission from the power transmission device” corresponds to “when the load is fully charged”. Such cases are also included in the technical scope of the present embodiment.

  Further, the intermittent temporary power transmission cycle (the cycle of the automatic intermittent operation in step S1 in FIG. 8) is a fairly short cycle (for example, 0.5 seconds) because of the importance of quickly detecting the installation of the power receiving device 510. It is desirable to carry out with the period of On the other hand, the removal detection after full charging is not particularly problematic even if it is longer than the period of temporary power transmission, and wasteful power consumption increases if frequent removal detection is performed. Therefore, the first cycle T10 for detection of removal after full charge is set to a cycle longer than the cycle of temporary power transmission (for example, a cycle of 5 seconds) to suppress an increase in power consumption. In addition, the frequency of recharge detection after full charge may be even less (it takes a considerable amount of time until a fully charged battery is discharged and needs to be recharged. The second period T20 for full charge detection is set to be longer than the first period T10 (for example, 10 minutes). Set to a period of Thereby, intermittent power transmission can be performed at a period according to each purpose, and power consumption can be suppressed to a minimum.

(Example of configuration of power transmission side control circuit in auto mode)
FIG. 9 is a circuit diagram showing an example of the configuration of the power transmission side control circuit in the auto mode. As illustrated, the power transmission side control circuit 22 includes a logic circuit 100. The logic circuit 100 includes a position detection unit 106, an ID authentication unit 108, a removal detection unit 110, a foreign object detection unit 112 (including a hijacking state detection unit 114), and a full charge notification (power transmission stop request) detection unit 116. A recharge request detection unit 117; a timer 119 for managing time; and a power transmission control unit 118 that controls on / off of power transmission (temporary power transmission and normal power transmission) based on detection results of the respective units. . The power transmission control unit 118 includes an intermittent power transmission control unit 121 after full charge.

(Example of basic sequence of auto-mode non-contact power transmission system)
FIG. 10 is a diagram illustrating a basic sequence example of a contactless power transmission system in an auto mode. The user sets the power receiving side device 510 at a predetermined position of the charger 500, for example. As described above, the power transmission device 10 performs an automatic intermittent operation and always performs intermittent temporary power transmission (steps S19 and S20). Position detection of the power receiving device 510 that has received temporary power transmission is executed (step S21), and temporary power transmission is stopped if the position is inappropriate (step S22).

  If the set position of power receiving device 510 is appropriate, ID authentication is executed (step S23). That is, ID authentication information (manufacturer information, device ID number, rating information, etc.) is transmitted from the power receiving device 40 to the power transmitting device 10.

  If successful after the ID authentication, the power transmitting apparatus 10 starts normal power transmission to the power receiving apparatus 40 (step S26). During the normal power transmission period, as described above, removal detection (step S29), metal foreign object detection (step S30), secondary-side periodic load authentication (including secondary load reduction processing as necessary: step S31) The takeover state detection (step S32) is executed, and when any one is detected, the normal power transmission is stopped (step S33). Note that the load reduction associated with periodic load authentication on the secondary side means that even if the load (battery or the like) is heavy and the load modulation is performed, the modulation signal may not be received well on the primary side. This is a process of restricting (or stopping) the power supply to the load when the operation is performed and apparently forcibly reducing the load state (this point will be described later with reference to FIG. 23).

  In FIG. 10, when detecting a full charge, the power receiving device 40 creates a full charge notification (save frame: power transmission stop request frame) and transmits it to the power transmission device 10 (step S34). When detecting a full charge notification (transmission stop request frame) (step S35), the power transmission device 10 turns off normal power transmission (step S36), and instead, performs intermittent power transmission after full charge (step S37). ). Intermittent recharge determination is performed (step S38), and if recharge is required, normal power transmission (step S26) is resumed. Further, removal detection of the power receiving side device 510 after full charge is executed (step S39), and when removal is detected, the initial state is restored.

  FIG. 11 is a state transition diagram showing state transition of the non-contact power transmission system that executes the sequence of FIG. 10. As shown in the figure, the system is in the initial state (idle state: ST1), position detection state (ST2), ID authentication state (ST3), power transmission (normal power transmission) state (ST4), periodic load authentication state (ST5). ) (And load reduction state ST6), and the state of intermittent power transmission after full power reception (ST7).

  Transition from ST1 to ST2 by the installation detection (Q1) of the power receiving side device by the automatic intermittent operation returns to ST1 when the position detection is NG (Q2). If the position detection is OK, the process proceeds to ST3. If ID authentication is OK (Q6), the state transits to the normal power transmission state (ST4).

  In the normal power transmission state ST4, removal detection (Q12), metal detection (Q10), takeover state detection (Q17), and full charge detection (Q14) are executed. When any one of Q10, Q12, and Q17 is detected, the initial state is restored (Q9, Q11, Q13). Moreover, if full charge (Q14) is detected, it will transfer to intermittent power transmission state ST7 (Q15). In the intermittent power transmission state ST7, recharge necessity detection Q18 and removal detection Q16 are executed. When removal is detected, the initial state is restored (Q20). If recharging is required, normal power transmission is resumed (Q19).

  The non-contact power transmission system that executes the basic sequences of FIGS. 10 and 11 can automatically detect the installation of the power receiving side device that is a power transmission target. Therefore, there is no need for the user to operate the operation switch, and a contactless power transmission system that is easy to use is realized. In addition, by using ID authentication as a condition for normal power transmission, power is not transmitted to an inappropriate device, and reliability and safety are improved. Also, during normal power transmission, various detection operations (removal detection, metallic foreign object detection, hijacking state detection based on secondary side load authentication, full charge detection) are executed, and when any one is detected, Since power transmission is quickly stopped and returned to the initial state, no unnecessary power transmission occurs, and all possible measures against foreign objects are taken, resulting in extremely high reliability (safety). A system is realized. Furthermore, when full charge (in a broad sense, the load has reached a predetermined state) is detected, intermittent power transmission for monitoring the load state after full charge (specifically, for example, intermittent power transmission for removal detection and re-transmission) By executing (intermittent power transmission for determining necessity of charging), the operation for keeping the power receiving device in an optimum state is continued even after full charging. Therefore, user satisfaction is further improved.

  12 and 13 are flowcharts showing an operation example of the contactless power transmission system that executes the basic sequence of FIG. 10. 12 and 13, the operation flow on the power transmission side (primary side) is shown on the left side, and the operation flow on the power reception side (secondary side) is shown on the right side.

  As shown in FIG. 12, the power transmission side control circuit 22 executes an automatic intermittent operation (step S40). That is, temporary power transmission is started from the power transmission side at a predetermined time interval (for example, the transmission frequency is f1: step S41), and counting by a timer is started (step S42).

  On the power receiving side, when provisional power transmission is received, the power is switched from the stopped state (step S60) to the power-on state (step S61), and position level determination (position detection) is executed. If the position level is NG, the process returns to the initial state (step S60). If OK, the generation of the ID authentication frame (step S63) and the transmission of the ID authentication frame (step S64) are executed.

  On the power transmission side, ID authentication frame reception processing (step S44) and timeout determination (step S43) are performed. If the ID authentication frame cannot be received within a predetermined time, temporary power transmission is stopped (step S51), and the initial state is set. Return to.

  On the other hand, if the ID authentication frame is received within the predetermined time, the frame authentication process is executed (step S45). If the authentication is OK, the permission frame is transmitted to the power receiving side (step S47). Stops temporary power transmission (step S51) and returns to the initial state.

  The power receiving device 40 verifies the permission frame from the power transmission device 10 (step S65), and transmits a start frame to the power transmission device 10 (step S66).

  The power transmission device 10 verifies the start frame (step S48), turns on detection of periodic load fluctuation (for hijacking state detection) (step S49), and starts normal power transmission (step S50). The power receiving device 40 receives normal power transmission and starts charging a load (for example, a battery) (step S67).

  Subsequently, the subsequent flow will be described with reference to FIG. The power transmission device 10 waits for a full charge notification (power transmission stop request) from the power receiving device 40 while performing detection of each of the removal, metal foreign matter, and hijacking state (step S70).

  The power receiving device 40 performs periodic load modulation for takeover detection while charging the load (step S80), and detects full charge of the load (step S81). That is, the full charge detection circuit 62 determines that the light emitting diode LEDR is fully charged when the light emitting diode LEDR remains off for a predetermined time (for example, 5 seconds) or longer. When the full charge is detected, the power receiving device 40 transmits a full charge notification frame (save frame: power transmission stop request) to the power transmission device 10 (step S82).

  When receiving the full charge notification frame (save frame: power transmission stop request) from the power receiving device 40, the power transmission device 10 turns off the periodic load fluctuation detection (step S72) and stops power transmission (step S73).

(About detection of hijacking status)
Hereinafter, detection of the takeover state (measures against takeover heat generation) will be specifically described. The “takeover state” is positioned as a special form of foreign object insertion, and is “a state in which normal power transmission is continued by misidentifying a foreign object as a power receiving device”. For example, when a thin metal plate is inserted so as to completely block between the primary coil and the secondary coil, a considerable amount of load is always present when viewed from the power transmission side. For example, removal detection is difficult. It becomes.

(Takeover heat generation measures)
First, the “takeover state” will be specifically described. After authentication of the power receiving device (or the power receiving device) is completed and normal power transmission is started, for example, a large-area foreign object may be inserted between the primary coil L1 and the secondary coil L2. As described with reference to FIG. 17, the presence of the metal foreign object can be detected by monitoring the induced voltage of the primary coil (L1).

  However, as shown in FIG. 19B, a metal foreign object (for example, a thin metal plate) that cuts off the primary coil L1 and the secondary coil L2 is provided between the power transmission side device and the power reception side device, for example. When inserted, the power transmission energy from the primary side is consumed by the metal foreign object (that is, the metal foreign object becomes a load). Looks like it exists. Therefore, for example, even if the power receiving device is removed, there may be a case where the removal detection based on the induced voltage of the primary coil L1 as described with reference to FIG. 18 cannot be performed. Despite the absence, power transmission from the power transmission device 10 is continued, and the metal foreign matter reaches a high temperature.

  In this specification, the phenomenon that the metal foreign object replaces the original power receiving device 510 is referred to as “takeover” in this specification. In order to increase the safety and reliability of the contactless power transmission system to a practical level, it is necessary to take sufficient measures against such “takeover heat generation”. As a case where a foreign object is inserted, a case where it occurs accidentally and a case where it is done maliciously are assumed. When foreign objects that cause hijacking are inserted, heat is generated and there is a risk of burns, equipment damage, or destruction. Therefore, in the non-contact power transmission system, thorough safety measures against foreign object insertion are required. Hereinafter, countermeasures against takeover heat generation will be specifically described.

  FIG. 19A and FIG. 19B are cross-sectional views of electronic devices constituting the non-contact power transmission system for explaining foreign object insertion (takeover state) after normal power transmission is started.

  In FIG. 19A, the mobile phone terminal 510 (electronic device including the power receiving device 40) is set at a predetermined position on the cradle 500 (electronic device including the power transmitting device 10). In this state, the primary coil is set. Contactless power transmission is performed from the cradle (charger) 500 to the mobile phone terminal 510 via L1 and the secondary coil L2, and the secondary battery (for example, battery pack) 94 built in the mobile phone terminal 510 is charged. Has been done.

  In FIG. 19B, during normal power transmission, a thin plate-shaped metal foreign matter (conductive foreign matter) AR is inserted between the cradle (charger) 500 and the mobile phone terminal 510 by malicious intent. When the foreign object AR is inserted, most of the power supplied from the primary device (cradle 500) to the secondary device (mobile phone terminal 510) is consumed in the foreign material (AR) (ie, transmitted power). And the risk of heat generation of the foreign object AR increases. Therefore, when the state shown in FIG. 19B is reached, the power transmission device 10 included in the primary device (cradle 500) needs to detect the insertion of the foreign object AR and immediately stop normal power transmission. .

  However, with the method for detecting a metallic foreign object as described with reference to FIG. 17, it is difficult to sufficiently grasp the takeover state as shown in FIG.

  For example, when the load on the power receiving device side is large, the amplitude of the voltage induced in the primary coil L1 increases. When the load on the power receiving device side decreases, the amplitude of the voltage induced in the primary coil L1 decreases. Become. If the secondary battery 94 of the mobile phone terminal 510 is normally charged, the load on the power receiving device 40 side should gradually decrease with time. Here, if the load on the power receiving device 40 side suddenly increases, the power transmission device 10 can detect that the load has suddenly increased because the power transmission device 10 monitors the load fluctuation on the power receiving device 40 side. However, whether the increase in load is caused by a load (secondary battery 94 of the mobile phone terminal), a shift in position between the mobile phone terminal 510 and the cradle 500, or It cannot be determined whether it is caused by foreign object insertion. Therefore, the foreign substance insertion cannot be detected by the method in which the power transmission device 10 simply detects the load fluctuation on the power reception device 40 side.

  Therefore, in the present invention, during normal power transmission, the power receiving device 40 intermittently and intentionally changes the load viewed from the power transmission device 10 while continuing to supply power to the load (secondary battery or the like) (periodic load). Modulation operation), information is transmitted to the power transmission device 10.

When the power transmission device 10 can detect information based on the intermittent load change at a predetermined timing, the following is proved.
(1) The device (mobile phone terminal 510) on the power receiving device 40 side is accurately set on the device (cradle 500) on the power transmitting device 10 side.
(2) Devices on the power receiving device 40 side (including the secondary battery of the mobile phone terminal 510) are operating normally.
(3) The foreign object AR is not inserted.

  On the other hand, when the foreign object AR is inserted during normal power transmission, the information transmitted from the power receiving device 40 is blocked by the foreign object AR and does not reach the power transmission device 10. That is, the power transmission device 10 cannot detect intermittent load changes (for example, periodic load changes) on the power receiving device side. After the above (1) to (3) are confirmed, the above-mentioned factor (3) is most suspected as a factor that the intermittent load change is not detected. That is, it is possible to determine that the intermittent load change cannot be detected because the foreign object AR is inserted.

  FIG. 20A and FIG. 20B are diagrams for explaining a specific mode in the case where the load on the power receiving apparatus is intermittently changed so that foreign object insertion can be detected.

  In FIG. 20A, the state of the intermittent change of the load on the power receiving device side is represented by the change of the secondary current (current flowing through the secondary coil L2). As shown in the figure, the load on the power receiving device side is intermittently changed at times t1, t2, t3, t4, t5.

  Specifically, in FIG. 20A, the load changes at the cycle T3. Further, for example, the load becomes light in the period T2 starting from the time t1, and the load becomes heavy in the subsequent period T1. Such a periodic change is repeated in the cycle T3.

  FIG. 20B shows a change in the primary coil voltage (induced voltage at one end of the primary coil) with respect to the change in the secondary load current. As described above, the load on the secondary side is heavy in the period T1, and the load is light in the period T2. In accordance with the change in the load on the secondary side, the amplitude (peak value) of the induced voltage (primary coil voltage) at one end of the primary coil (L1) changes. That is, the amplitude is large during the heavy load period T1, and the amplitude is small during the light load period T2. Therefore, in the power transmission device 10, the load fluctuation on the power reception device 40 side can be detected by, for example, detecting the peak of the primary coil voltage with the waveform detection circuit 28 (see FIG. 3). However, the load variation detection method is not limited to this method, and for example, the phase of the primary coil voltage or the primary coil current may be detected.

  The load modulation can be easily performed by, for example, switching of a transistor, and the peak voltage of the primary coil can be detected with high accuracy using a basic analog or digital circuit. This is easy to implement. Further, it is advantageous in terms of suppressing the mounting area and cost.

  In this way, during normal power transmission, the power receiving device 40 performs information transmission by intermittent (and periodic) load modulation, and the power transmission device 10 detects the load fluctuation, thereby adopting a new method. Without adding a special configuration, insertion of a foreign object can be detected with high accuracy by a simple method.

(Specific example of foreign object insertion detection)
FIG. 21 is a circuit diagram illustrating a main configuration related to the detection of foreign object insertion (takeover state) from the non-contact power transmission system illustrated in FIG. 3. In FIG. 21, the same reference numerals are given to the portions common to FIG. Further, in FIG. 21, a portion that plays an important role in foreign object insertion detection is indicated by a thick line.

  The circuit configurations to be noted in the power receiving device 40 shown in FIG. 21 are the load modulation transistor TB3 constituting the load modulation unit 46 (see FIG. 3) and the power supply control transistor TB2 constituting the power supply control unit 48 (see FIG. 3). , A power reception control circuit 52 for controlling on / off of both transistors (TB2, TB3). Further, the voltage at the input end and the output end of the series regulator (LDO) 49 is input to the power reception control circuit 52 via the signal lines LP2 and LP1. It is also important that the load state (load weight) of the included battery (secondary battery) 94 can be detected.

  Moreover, in the power transmission apparatus 10 (refer FIG. 3), it is the structure of the power transmission control apparatus 20. FIG. That is, it is important that the peak value (amplitude) of the induced voltage of the primary coil (L1) is detected by the waveform detection circuit 28, and the load fluctuation on the power receiving device 40 side is detected by the power transmission control circuit 22.

  In FIG. 21, the power receiving device 40 performs load modulation during normal power transmission (continuous power transmission after authentication), transmits the foreign object detection pattern PT1 to the power transmission device 10, and the power transmission side control circuit 22 of the power transmission device 10. Monitors the load change on the power receiving device 40 during normal power transmission (either continuous monitoring or intermittent monitoring), and determines that the foreign object AR has been inserted when the foreign object detection pattern PT1 cannot be received. To stop normal power transmission.

(Specific Mode of Foreign Object Detection Pattern PT1)
FIGS. 22A and 22B are diagrams for explaining a preferable and specific mode of load modulation for enabling foreign object detection, and FIG. 22A is a diagram illustrating an example of load modulation timing. (B) is a figure which shows concretely the mode of the load fluctuation by the side of a power receiving apparatus detected by the power transmission apparatus.

  As shown in FIG. 22 (A), load modulation for enabling foreign object detection is performed periodically (periodically), for example, at a period of 5 seconds (10 sec).

  Times t1 to t6 and times t7 to t12 are periods in which load modulation for enabling foreign object detection is performed. From time t1 to t6 (from time t7 to t12) is 0.5 seconds (0.5 sec), and the weight of the load is switched in units of 0.1 seconds (100 msec) that divides 0.5 seconds into 5 equal parts. It is done.

  In FIG. 22A, the period indicated by the thick arrows in both lines is a heavy load period. That is, the load becomes heavy in each period of time t1 to t2, time t3 to t4, time t5 to t6, time t7 to t8, time t9 to t10, time t11 to time t12. TA is a period during which the load becomes heavy.

  On the other hand, the load is reduced in each period of time t2 to t3, time t4 to t5, time t8 to t9, and time t10 to t11. The period during which the load is lightened is TB.

  In FIG. 22 (A), as is clear, intermittent changes in the load on the power receiving device side during normal power transmission are executed periodically (that is, every cycle), and the load is predetermined within one cycle. It changes intermittently several times at intervals.

  By setting the periodic load change, the power transmission device 10 and the power reception device 40 can exchange information by changing the load while ensuring synchronization (that is, the load on the power reception device 40 side on the power transmission device 10 side). Can easily know when changes occur).

  Further, in FIG. 22A, the load is intermittently changed a plurality of times at predetermined intervals only in a partial period (time t1 to t6) within one cycle (for example, time t1 to t7). . That is, load modulation is concentrated in the initial period (first 0.5 sec) of the first half of one cycle (10 sec). The reason for performing this type of load modulation is as follows.

  That is, since a load change (load modulation) during normal power transmission may affect the power supply to the load (battery 94 in FIG. 21), it is not preferable to perform it too frequently. Therefore, for example, one period of load modulation is lengthened to some extent (in this way, even if the period is set a little longer, there is no problem in terms of foreign object detection).

  Then, the load is intermittently changed a plurality of times at predetermined intervals only in a partial period in one cycle. The reason for limiting to a partial period is that if the load change interval widens widely, the load status of the load will change over time or the surrounding conditions will change. This is because it may adversely affect the detection of intermittent load changes on the power receiving device side. That is, for example, one cycle is long (10 sec in FIG. 22A), and a plurality of times are concentrated in a short period (0.5 sec in FIG. 22A) within the long one cycle. (5 times in FIG. 22A) intermittent load modulation is performed.

  By performing load modulation of this type, high foreign matter (AR) on the power transmission device 10 side is minimized while minimizing the influence on power supply (for example, charging of the battery pack) to the load (94). Detection accuracy can be realized.

  FIG. 22B illustrates an example of an amplitude change in the induced voltage at one end of the primary coil (L1) in the power transmission device 10 corresponding to the load on the power reception device side as viewed from the power transmission device. However, in FIG. 22B, the load state of the load (battery 94) changes in the load modulation period (t1 to t6) in the first half cycle and in the load modulation period (t7 to t12) in the second half cycle. In the latter half cycle, the load state of the load (battery 94) becomes heavier, thereby increasing the peak value of the primary coil voltage.

  At time t1 to t6 in FIG. 22B, the difference between the primary coil voltage in the period TA in which the load becomes heavy and the primary coil voltage in the period TB in which the load becomes light is ΔV1. From the amplitude difference ΔV1 of the primary coil voltage, the power transmission side control circuit 22 of the power transmission device 10 can detect a load change on the power reception device 40 side.

  However, in the latter half of the load modulation period (time t7 to t12), the load state of the load (battery 94) becomes heavy and the charging current (Iload) of the load 94 increases, so that the load modulation with respect to the charging current (Iload) is increased. As a result, the ratio of the modulation current (Imod) is reduced, and the difference in the primary coil voltage due to on / off of the modulation current (Imod) is reduced to ΔV2 (ΔV2 <ΔV1). That is, the modulation current (Imod) is buried in the charging current (Iload) of the load (battery 94). Therefore, it cannot be denied that when the load (battery 94) is heavy, it is difficult to detect a load change on the power transmission device 10 side as compared to when the load is light. Therefore, in this embodiment, the power supply to the load (battery 94) is forcibly reduced to reduce the load state of the load (battery 94), and it is easy to detect a load change due to load modulation on the primary side. To do. Hereinafter, load reduction measures will be described.

  (Measures to forcibly reduce the load)

  In the present invention, load modulation is performed without stopping power transmission to the load 94 during normal power transmission. Therefore, transmission of a signal to the power transmission apparatus 10 side by the load modulation is always a power supply status to the load 94 (that is, Affected by the load state).

  As described above, when a large amount of charging current is supplied to the load 94 (battery pack or the like), even if a small current is turned on / off for load modulation, the current amount of the on / off current (Imod) Is smaller than the amount of charge current (Iload) of the load (battery 94), it is difficult for the power transmission device 10 to detect the state of load change due to load modulation (that is, whether noise or load It is difficult to detect whether the signal is due to modulation). On the other hand, when the current supplied to the load 94 is small (when the load is light), the relative ratio of the on / off current (Imod) due to load modulation increases, and the load due to the on / off from the power transmission device 10 increases. It becomes easy to grasp the change.

  Based on such considerations, in the present embodiment, during normal power transmission, the power receiving device 40 itself monitors the load state of the load 94 and performs load modulation to enable foreign object detection. When the load is heavy (that is, when a large amount of current is supplied to the load 94), a measure is taken to forcibly reduce the power supply to the load 94. Note that reducing the power supply includes temporarily (or intermittently) stopping the power supply.

  When the power supply to the load 94 is reduced, the load state of the load 94 is apparently reduced, and the power transmission device 10 can easily detect a signal due to load modulation, and thus the load 94 is heavy. Even in this case, the foreign object detection accuracy is maintained at a desired level. Even when the load 94 is forcibly reduced, at least the necessary minimum power is always given to the load 94, and the electronic circuit (charge control device 92) on the load 94 side can operate. The problem of disappearing does not occur.

  In addition, load modulation for enabling detection of foreign object insertion is performed intermittently as described above, and the load modulation is performed at appropriate intervals in consideration of the influence on power supply to the load 94. Therefore, even if forced load reduction is performed, there is no particular adverse effect on power transmission to the load 94. For example, a problem that the charging time of the battery pack becomes extremely long never occurs.

  As described above, by monitoring the state of the load 94 on the power receiving device 40 side and performing load modulation for detecting foreign object insertion, if necessary, the load 94 is forcibly reduced. Even when the load 94 is heavy, the load change detection accuracy on the power transmission device 10 side can be maintained at a desired level.

  FIG. 23A to FIG. 23E are diagrams for explaining the load reducing operation. Specifically, FIG. 23A shows a light load state, FIG. 23B shows a heavy load state, and FIG. 23C shows the primary in the state shown in FIG. It is a figure which shows the mode of a change of a coil voltage, (D) is a figure which shows the state which is carrying out the reduction | restoration of a load by making the electric power feeding control transistor turn on / off continuously, or making it a half-on state. (E) is a figure which shows the mode of the change of the primary coil voltage in the state shown by (D).

  In the case of FIG. 23A, since the load (battery) 94 is light (that is, the charging current Iload of the load is small), the power receiving device 40 side does not perform the load reduction operation, Thus, a load change due to load modulation can be sufficiently detected. Therefore, the power supply control transistor TB2 is always on. The load modulation transistor TB3 is intermittently turned on / off, thereby performing load modulation.

  In FIG. 23B, since the load (battery) 94 is heavy (that is, the load charging current Iload is large), it is difficult to see the current change due to the on / off of the modulation current (Imod). As shown in FIG. 23C, when the load changes from a light state to a heavy state, the change in the amplitude of the primary coil voltage is reduced from ΔV1 to ΔV2, making it difficult to detect a load change due to load modulation.

  Therefore, in FIG. 23D, load reduction operation is also performed at the time of load modulation. That is, in FIG. 23D, an operation of continuously turning on / off the power supply control transistor TB2 or setting it to a half-on state is performed.

  That is, the power supply to the load 94 is forcibly reduced (temporarily) by a digital method in which the power supply control transistor TB2 interposed in the power supply path is continuously turned on / off and the power supply is intermittently performed. Including stopping power supply). Switching the transistors continuously is an operation normally performed in a digital circuit and is easy to realize. Further, by selecting the switching frequency, there is an advantage that it is possible to accurately control how much the power supplied to the load is reduced.

  In addition, an analog method is adopted, and a voltage intermediate between the voltage when fully turned on and the voltage when completely turned off is supplied to the gate of the power supply control transistor (PMOS transistor). The power supplied to the load 94 can also be reduced by setting the state. By controlling the gate voltage, there is an advantage that the on-resistance of the power supply control transistor (PMOS transistor) can be finely adjusted.

  In FIG. 23E, the amplitude of the primary coil voltage under heavy load changes from V10 to V20 due to the forced reduction of the load. In the figure, “X” indicates a forced reduction amount of the load 94. By forcibly reducing the load 94, the amount of change in the amplitude of the primary coil voltage is expanded from ΔV2 (see FIG. 23C) to ΔV3 (ΔV3> ΔV2), and the power transmission device 10 receives the power receiving device by load modulation. It becomes easy to detect the load change on the 40 side.

  In this way, load change operation (including the operation to temporarily stop the load current) is executed together with load modulation, so that a load change can be reliably detected even on a heavy load. Is possible.

(Specific operation of power transmission device)
Here, a specific operation of the power transmission control device 20 in FIG. 21 will be described. As described above, the periodic load fluctuation detection unit 114 (see FIG. 9) of the power transmission side control circuit 22 included in the power transmission control device 20 performs intermittent changes in the load on the power reception device 40 side during normal power transmission. When it cannot be detected, it is determined that a foreign object (AR) is inserted between the primary coil (L1) and the secondary coil (L2), and power transmission is stopped. This reliably prevents heat generation, burns, or equipment damage or destruction in the foreign matter (AR). Therefore, a highly reliable foreign object insertion measure is realized in the non-contact power transmission system.

  In addition, since it is necessary to be cautious in determining whether or not a foreign object has been inserted, the power transmission side control circuit 22 detects a load change at each of a plurality of cycles, and continuously changes the load over a predetermined number of cycles. When it cannot be detected, it is preferable to determine that a foreign object has been inserted between the primary coil and the secondary coil.

  For example, a change in load on the power receiving device side is detected for each of a plurality of cycles, and normal power transmission is stopped when a load change cannot be detected continuously over a predetermined number of cycles (for example, three cycles). As a result, the detection accuracy of foreign object insertion is increased, and for example, when a load change cannot be detected due to an accidental factor, a situation in which normal power transmission is erroneously stopped does not occur.

  The change in the load on the power receiving device 40 side as viewed from the power transmitting device 10 can be detected by detecting the waveform of the induced voltage of the primary coil (L1), and this waveform detection can be performed by the waveform detection circuit 22. .

  As described above, the peak value (amplitude) of the waveform of the induced voltage of the primary coil (L1) increases when the load on the power receiving device 40 is heavy and decreases when the load is low. The load change on the 40 side can be detected. However, the present invention is not limited to this detection method, and other methods, for example, a method of detecting the induced voltage or current phase of the primary coil may be employed.

  Thus, according to this embodiment, the novel power transmission device 10 having a function of detecting foreign matter insertion (takeover) by periodic load authentication is realized. According to the present embodiment, it is possible to detect the insertion of a foreign object between the primary coil and the secondary coil with high accuracy by simple signal processing while suppressing the number of parts, and contactless power transmission. Highly reliable safety measures can be realized.

  Further, the power transmission stop function based on the periodic load authentication can be not only a takeover detection but also a last fort that forcibly stops inappropriate power transmission. For example, even if the removal detection of the power receiving side device does not work effectively for some reason, or if the power receiving side device is damaged or malfunctioned and periodic load modulation cannot be performed, power transmission from the power transmission side device is not possible. Stop surely. Therefore, the safety and reliability of the contactless power transmission system is significantly improved by having the periodic load authentication function.

(Necessity determination of recharge after full charge and removal detection after full charge)
In the following description, detection of necessity of recharging after full charge and detection of removal after full charge will be described. For example, in the non-contact power transmission system of FIG. 1C, when the second auto mode switch SW2a is turned on, not only automatic installation detection to full charge detection and normal power transmission is automatically turned off, but also after recharging after full charge. It is also necessary to automatically determine whether charging is necessary and detect removal after full charging. In this case, the power transmission side control circuit 22 performs the operations shown in FIGS. 14 and 15. Hereinafter, it demonstrates in order.

(Recharge after full charge)
Hereinafter, recharging after full charge will be described. After a full charge, for example, if a mobile phone terminal as a power receiving device is left on the charging stand (cradle) for a long time, the voltage will drop due to the discharge of the battery, and the battery will be recharged. May be necessary. Therefore, in the present embodiment, the power transmission device can automatically detect the necessity of recharging after full charging.

  FIGS. 14A and 14B are sequence diagrams showing a series of operation procedures for recharge management after full charge in the non-contact power transmission system. Note that the procedure of FIG. 14B is executed after the procedure of FIG.

  When the battery 94 (see FIG. 3) is in a fully charged state, a transition is made to a standby mode after full charging. In the standby mode after full charge, the power transmission device 10 intermittently transmits power to the power reception device 40, and at this time, transmits to the power reception device 40 that the standby mode is after full charge. When receiving the fact that the power receiving device 40 is in the standby mode after full charge, the power receiving device 40 checks the battery voltage VBAT. When the battery voltage VBAT is equal to or lower than the recharge voltage (for example, 3.9 V), it is determined that recharge is necessary, and a recharge command is transmitted to the power transmission device 10. As a result, the power transmission device 10 resumes normal power transmission to the power reception device 40. Thereby, recharging of the battery 94 is started. At this time, the standby mode after full charge is canceled. On the other hand, when the battery voltage VBAT is higher than the recharge voltage, the standby mode after full charge is continued. This will be specifically described below.

  When it is detected that the battery 94 included in the load is in a fully charged state, the power transmission side control circuit 22 of FIG. 3 stops normal power transmission to the power receiving device 40 and performs intermittent power transmission. And the power transmission side control circuit 22 performs control which restarts normal power transmission with respect to the power receiving apparatus 40, when it detects that the battery 94 became the recharge required state in this intermittent power transmission period.

  On the other hand, the power receiving side control circuit 52 in FIG. 3 recharges the battery 94 during the intermittent power transmission period when the battery 94 is fully charged and the power transmission device 10 stops normal power transmission and performs intermittent power transmission. Control is performed to transmit a recharge command to inform the state-related information to the power transmission device 10. In this case, the full charge state of the battery 94 is detected by the full charge detection circuit 62, and the recharge state of the battery 94 is monitored by the recharge monitoring circuit 64. The information on the recharge state is information for determining whether or not the battery 94 is in a recharge state, information on whether or not recharge is necessary, and the battery voltage VBAT after full charge. Information.

  More specifically, as shown at A1 in FIG. 14A, the control circuit 52 on the power receiving side informs that the battery 94 is fully charged when the battery 94 is fully charged. Control is performed to transmit (full charge information) to the power transmission device 10 by load modulation by the load modulation unit 46, for example. And as shown to A2, control which stops the voltage output (electric power supply) of VOUT to the charge control apparatus 92 is performed. For example, the control circuit 52 determines that the battery 94 is fully charged (charge complete) when the full charge detection circuit 62 detects that the LEDR used for displaying the charge state has been extinguished for 5 seconds, for example. To do. Then, a frame for transmitting the full charge command is generated, the signal P3Q is controlled to perform load modulation, and the generated frame is transmitted to the power transmission device 10.

  On the other hand, when the control circuit 22 on the power transmission side receives a full charge command during normal power transmission to the power receiving device 40, the full charge flag FC is set to 1 as indicated by A3 in FIG. As shown in A4, control is performed to stop power transmission to the power receiving device 40 during the first period T1 (for example, 1 second). Thereafter, as shown in A5, power transmission is resumed and intermittent power transmission is performed. Then, in the intermittent power transmission period after resumption of power transmission, as shown in A6, re-instruction for instructing detection of the recharged state of the battery 94 (detection of whether recharge is necessary or detection of the battery voltage after full charge). Control to transmit the charge detection command to the power receiving device 40 is performed. That is, the power transmission device 10 generates and transmits a frame of the recharge detection command by the method described with reference to FIG. In addition, the control circuit 22 transmits the recharge command until the timeout waiting period T2 (for example, 30 msec. T2 <T1: T1 is a power transmission stop period) after the recharge detection command is transmitted. If it is not received from the power receiving device 40, it is determined as a timeout. In the case of a timeout, power transmission to the power receiving device 40 is again stopped during the period T1 as indicated by A8, and a recharge detection command is issued during the intermittent power transmission period after power transmission is resumed as indicated by A9. Control to transmit again. In the following description, the power transmission stop period T1 may be referred to as a first period, and the timeout waiting period T2 may be referred to as a second period.

  As indicated by A10 in FIG. 14A, the power reception control device 50 enters a reset state by stopping power transmission from the power transmission device 10 after transmission of the full charge command. That is, since no power is supplied from the power transmission device 10, the power supply voltage becomes 0V and the reset state is established. Then, the control circuit 52 on the power receiving side receives the recharge detection command from the power transmission device 10 after the reset state is released by intermittent power transmission from the power transmission device 10 as shown in A11. Perform recharge status monitoring. That is, it is determined by monitoring whether the battery 94 is in a rechargeable state. Alternatively, the battery voltage VBAT may be monitored and transmitted to the power transmission device 10. This recharge state monitoring process is performed based on the monitoring result of the recharge monitoring circuit 64 of FIG.

  In B <b> 1 of FIG. 14B, the power receiving-side control circuit 52 transmits a recharge command for informing information related to the recharge state of the battery 94 to the power transmission device 10. For example, if the control circuit 52 on the power receiving side determines that the battery 94 is in a recharge necessary state based on the monitoring result in the recharge monitoring circuit 64, it transmits a recharge command to the power transmission device 10. When receiving the recharge command from the power receiving device 40, the power transmission side control circuit 22 resets the full charge flag FC to 0 as indicated by B2, and resumes normal power transmission to the power receiving device 40 as indicated by B3. . That is, based on the recharge command, when it is determined that the battery 94 is in a recharge required state, normal power transmission is resumed. As a result, recharging of the battery 94 starts, and the battery 94 whose voltage has dropped can be recharged.

  The operation procedure of the non-contact power transmission system that automatically performs a series of operations of ID authentication, normal power transmission, full charge detection, and recharge management is shown in FIG. FIG. 15 is a flowchart showing an operation procedure of the non-contact power transmission system that automatically performs a series of operations of ID authentication, normal power transmission, full charge detection, and recharge management.

  First, processing on the power transmission side will be described. When the ID authentication with the power receiving side (secondary side) is completed, the power transmission side (primary side) resets the full charge flag FC to 0 (steps S1 and S2). Then, normal power transmission to the power receiving side is started (step S3). Thereafter, attachment / detachment (removal) detection is performed (step S4), and when attachment / detachment (removal) is detected, a transition is made to the normal standby mode. That is, in FIG. 2A (or FIG. 2B), when the mobile phone 510 is physically separated from the charger 500 and the magnetic flux of the primary coil L1 does not pass through the secondary coil L2, it is attached / detached. (Removal) is detected, and a transition is made to the normal standby mode. In this normal standby mode, intermittent power transmission is not performed as in the standby mode after full charge, and power transmission is completely stopped until the mobile phone 510 is placed on the charger 500 again.

  Next, the power transmission side determines whether or not a full charge command has been received from the power reception side (step S5), and if not received, returns to step S4. On the other hand, if it is received, the full charge flag FC is set to 1 (step S6). Then, during the first period (power transmission stop period) T1, power transmission from the power transmission side to the power reception side is stopped (step S7). This period T1 is measured by a count process using a clock on the power transmission side.

  When the first period T1 has elapsed, the power transmission side resumes power transmission, performs intermittent power transmission, and transmits a recharge detection command to the power reception side (step S8). That is, a frame for instructing detection of the recharge state is generated and transmitted to the power receiving side by frequency modulation. Then, it waits for the second period (timeout waiting period) T2 to elapse and time out (step S9). That is, the power receiving side releases the reset state by intermittent power transmission, starts operation, and waits for a recharge command to be transmitted. Until the second period T2 elapses, attachment / detachment detection (removal detection) is performed (step S10), and when attachment / detachment (removal) is detected, the process shifts to the normal standby mode. Further, it is monitored whether or not a recharge command is received from the power receiving side until the second period T2 elapses (step S11), and if not received, the process returns to step S9. When the second period T2 elapses and a time-out occurs, the process returns to step S7, and power transmission from the power transmission side to the power reception side is again stopped. And after progress of the power transmission stop period T1, intermittent power transmission is performed, and a recharge detection command is transmitted again to the power receiving side (step S8). Thus, the power transmission side repeats power transmission stop and intermittent power transmission until a recharge command is received from the power receiving side.

  When the power transmission side receives a recharge command from the power reception side in step S11, the power transmission side returns to step S2 and resets the full charge flag FC to zero. Then, normal power transmission for recharging the battery 94 is resumed (step S3). Thereby, recharging of the battery 94 whose voltage has decreased is started.

  Next, processing on the power receiving side will be described. When the ID authentication with the power transmission side is completed, the power receiving side starts normal power reception (steps S21 and S22). Thereafter, it is determined whether or not the battery 94 is fully charged. If the battery 94 is fully charged, a full charge command is transmitted to the power transmission side (steps S23 and S24). That is, a frame notifying full charge is generated and transmitted to the power transmission side by load modulation. As a result, the power transmission side sets the full charge flag FC to 1 and stops power transmission (steps S6 and S7). Then, the power receiving side stops the voltage output of VOUT to the charging control device 92 (step S25). That is, the transistors TB2 and TB1 in FIG. 3 are turned off, and the electrical connection with the load 90 is cut off. Specifically, the control circuit 52 sets the signal P1Q to H level to turn off the transistor TB2.

  When the power transmission side stops power transmission in step S7 of FIG. 15, the power reception side is in a state where no power is supplied, and thus is in a reset state. Thereafter, when the power transmission side starts intermittent power transmission, power is supplied to the power reception side, the power supply voltage on the power reception side rises, and the reset state is released (step S26). Then, the power receiving side determines whether or not a recharge detection command has been received (step S27). And when not receiving, it transfers to a normal ID authentication process. That is, normal standby mode processing is performed.

  When the recharge detection command is received, it is determined whether or not the battery 94 needs to be recharged (step S28). Specifically, it is determined whether or not the battery voltage VBAT is smaller than a recharge voltage (for example, 3.9 V). If it is determined that recharging is not necessary, no response is made to the power transmission side. As a result, a timeout occurs in step S9 on the power transmission side, power transmission from the power transmission side is stopped again, and the power reception side is reset.

  On the other hand, if the power receiving side determines that recharging is necessary in step S28, it transmits a recharging command (step S29). Upon receiving the recharge command, the power transmission side resets the full charge flag FC to 0 and resumes normal power transmission (steps S2 and S3). As a result, the power receiving side also resumes normal power reception (step S22) and exits the standby mode after full charge.

  As described above, according to the present embodiment, when full charging of the battery 94 is detected, the power transmission side stops power transmission (step S7). Further, the power receiving side stops the output of VOUT to the charging control device 92 (step S25), and shifts to the standby mode after full charging. In this standby mode after full charge, power transmission from the power transmission side is stopped, so that the power reception control device 50 is in a reset state, and since the VOUT output is stopped, the charge control device 92 is also in a reset state. Therefore, the standby current flowing through the power reception control device 50 and the charge control device 92 can be greatly reduced, and power saving can be achieved.

  According to the present embodiment, after the power receiving side is in the reset state, the power transmission side performs intermittent power transmission and transmits a recharge detection command (step S8). As a result, when the reset state is released, the power receiving side performs a recharge state monitoring process according to an instruction by the received recharge detection command (steps S27 and S28). If it is determined that recharging is necessary, a recharging command is transmitted (step S29).

  In other words, the power receiving side is in a reset state when power transmission is stopped, and thus cannot retain information regarding full charge or recharge. On the other hand, the power transmission side can hold such information. In the present embodiment, paying attention to this point, the power transmission side transmits a recharge detection command to the power receiving side in the intermittent power transmission period after power transmission is stopped. In this way, even if the power receiving side that has been released from the reset state does not hold information regarding full charge or recharge, the recharge state monitoring process can be started using the recharge detection command from the power transmission side as a trigger. . When the power receiving side determines that the recharging is necessary, the power receiving side can be notified of the recharging necessary state by transmitting a recharging command. Thereby, it becomes possible to recharge the battery 94 after full charge appropriately.

  On the other hand, if the power transmission side times out without receiving the recharge command within the period T2, the power transmission side stops power transmission again (steps S9 and S7). That is, power transmission stop and intermittent power transmission are repeated until a recharge command is received. Therefore, the power receiving side only needs to operate during the intermittent power transmission period, and the standby current in the standby mode after full charge can be significantly reduced by sufficiently lengthening the power transmission stop period T1. Therefore, the optimum recharging of the battery 94 can be realized while minimizing wasteful power consumption.

(Removal detection after full charge)
When the power receiving side device 510 is removed after full charging, it is not necessary to continue intermittent power transmission. Therefore, in order not to perform unnecessary power transmission, it is necessary to detect removal of the power receiving side device 510 after full charging. Hereinafter, removal detection after full charge will be described in detail.

  For example, the power transmission device 10 can perform intermittent power transmission to the power reception device 40 and receive the above-described ID authentication information from the power reception device 40 within a predetermined time. It can be detected by whether or not. That is, when the battery 94 is fully charged, normal power transmission is stopped. As a result, the charge control device 92 (see FIG. 3) provided in the load 90 is reset and returns to the initial state. When intermittent power transmission is performed from the power transmission device 10 at predetermined intervals after the battery is fully charged, the power reception device 40 that receives the power from the intermittent power transmission operates, and as described above, the power receiving side device 510 (or the power reception device 40) ID authentication information is transmitted to the power transmission apparatus 10 (see step S4 in FIG. 4). Therefore, if the power receiving side device 510 is not removed, ID authentication information should be sent from the power receiving device 40 to the power transmitting device 10 within a predetermined time from the start of intermittent power transmission. When the ID authentication information is not transmitted from the power receiving device 40 within a predetermined time, the power transmitting device 10 can determine that the power receiving device 510 has been removed. As shown in FIG. 19, the removal of the power receiving side device 510 can also be detected by observing the AC waveform (that is, the amplitude of the AC voltage) at the coil end of the primary coil L1.

  In the present embodiment, apart from intermittent power transmission for detecting whether recharging is necessary, intermittent power transmission for removal detection is executed. As described above, the first period T10 for detection of removal after full charge is set to a period (for example, 5 seconds) longer than the period for temporary power transmission (for example, 0.3 seconds) to suppress an increase in power consumption. . In addition, since the frequency of recharge necessity detection after full charge may be further reduced, the second period T20 for full charge detection is set longer than the first period T10 (for example, 10 Set to minutes). As a result, it is possible to detect each of the installation detection of the secondary side device, the detection of the necessity of recharging after full charging, and the removal detection after full charging at the optimum cycle while suppressing power consumption to the minimum. it can. Further, it is possible to detect removal of the power receiving device after full charge (leave) on a software basis without using special hardware. Therefore, a situation in which wasteful power transmission is performed does not occur even though the power receiving device is not installed.

As described above, when the auto mode is selected, a highly convenient non-contact power transmission system is realized. That is, according to at least one of the above-described embodiments, the following main effects can be obtained. However, the following effects are not always obtained at the same time, and the following list of effects should not be used as a basis for unduly limiting the technical scope of the present invention.
(1) In the non-contact power transmission system in which the auto mode is selected, installation of the power receiving device is automatically detected and normal power transmission is started, so that the user does not need to perform a switch operation or the like. Improves.
(2) By performing normal power transmission after executing ID authentication, normal power transmission is not performed on devices unsuitable for the system, and reliability and safety are improved.
(3) During normal power transmission, various detection operations (removal detection, metal foreign object detection, hijacking state detection based on periodic load authentication on the power receiving side, full charge detection) are executed, and when any one is detected, Since power transmission is quickly stopped and returned to the initial state, no unnecessary power transmission occurs, and all possible measures against foreign objects are taken, resulting in extremely high reliability (safety). A system is realized.
(4) The safety of the system is remarkably improved by using not only the usual countermeasure against foreign matter but also the countermeasure against takeover heat generation. In addition, when performing intermittent load modulation (periodic load modulation) for takeover detection in the power receiving apparatus, by executing load reduction, the power transmitting apparatus can reliably detect load fluctuations and the accuracy of takeover detection. Will improve.
(5) Furthermore, even after full charge, recharge management (and removal detection) is automatically performed, so the battery is always fully charged even if the power-receiving device is left on the charger for a long time. Keep the state of. Therefore, the user can use the contactless power transmission system with peace of mind, and can obtain sufficient satisfaction.
(6) The non-contact power transmission system of the present invention has an auto mode (automatic execution mode), and in the auto mode, all the series of operations described above are automatically performed. Therefore, a contactless power transmission system that does not place a burden on the user and is extremely convenient and easy to use is realized.
(7) Since installation detection of power-receiving-side equipment, recharge management after full power reception, and removal detection are executed based on intermittent power transmission from the power transmission device, power consumption is suppressed, and a non-contact with low power consumption A power transmission system is realized. If the cycle of intermittent power transmission is individually optimized in accordance with the above-mentioned purpose, the power consumption can be further suppressed.
(8) The device configuration is simplified, and the contactless power transmission system can be reduced in size and cost.

(Third embodiment)
In the present embodiment, an operation procedure of the non-contact power transmission system in the switch mode will be described.

(Outline of operation of power transmission device in switch mode)
FIG. 24 is a flowchart illustrating an outline of an example of the operation of the power transmission device in the switch mode. As shown by being surrounded by a thick dotted line, the operation of the power transmission device 10 includes “confirmation of power transmission target before power transmission (step SA)” and “confirmation of power transmission environment during power transmission (including before power transmission) (step SB). ”.
As described above, the power transmission device 10 starts temporary power transmission when the switch (SW1) is turned on (steps S1 and S2).

  Next, it is confirmed whether the set position of the power receiving device 510 is appropriate (step S3), ID authentication of the power receiving device 510 (power receiving device 40) is executed, and whether or not the power receiving device 510 is an appropriate power transmission target. Determine (step S4). By allowing a plurality of retries at the time of ID authentication, it is prevented that the user is forced to turn on the switch (SW1) due to an accidental ID authentication error, and the convenience of the user is improved. .

  If position detection or ID authentication fails (step S5), temporary power transmission is stopped and the process returns to an initial state waiting for switch-on (that is, a state waiting for step S1).

  Note that the position detection is determined based on a DC voltage (ADIN) obtained by rectifying the induced voltage of the secondary coil (L2) by the position detection circuit 56 in the power receiving device 40 of FIG.

  After ID authentication, normal power transmission (charging power transmission) is started (step S6). During normal power transmission, detection of a metallic foreign object (step S7), detection of a takeover state by periodic load fluctuation detection (steps S8 and S9), and removal of the power receiving side device (reeve) are detected (step S10). ) Further, forced switch off detection (step S11) and full charge notification (power transmission stop request) detection are executed (step S12). If any detection is confirmed (step S13), normal power transmission is turned off (step S14), and the process returns to the initial state (waiting for step S1).

  Metal foreign matter detection (step S7) and removal detection (step S10) can be detected based on the waveform change of the induced voltage signal of the primary coil (L1).

(Example of configuration of power transmission side control circuit in switch mode)
FIG. 25 is a circuit diagram showing an example of the configuration of the power transmission side control circuit in the switch mode. As illustrated, the power transmission side control circuit 22 includes a logic circuit 100.

  The logic circuit 100 includes a noise removal circuit 102 that removes noise generated when the switch SW1 is turned on / off, and a flip-flop (F) for storing whether the current state is a power transmission state or an initial state. / F) 104, position detection unit 106, ID authentication unit 108, removal detection unit 110, foreign object detection unit 112 (including hijacking state detection unit 114), and full charge notification (power transmission stop request) detection unit 116. And a power transmission control unit 118 that controls on / off of power transmission based on the detection result of each unit.

(Basic sequence example of contactless power transmission system)
FIG. 26 is a diagram illustrating a basic sequence example of the non-contact power transmission system. As shown on the left side, the power transmission side electronic device (power transmission side device) 500 is provided with a switch SW1. The user sets the power receiving side electronic device (power receiving side device) 510 at a predetermined position and presses the switch SW1. Using an edge (for example, a negative edge NT) generated as a trigger, temporary power transmission from the power transmission device 10 is started (step S20), position detection is performed (step S21), and temporary power transmission is stopped if the position is inappropriate. (Step S22).

  If the set position of power receiving device 510 is appropriate, ID authentication is executed (step S23). That is, ID authentication information (manufacturer information, device ID number, rating information, etc.) is transmitted from the power receiving device to the power transmitting device. Since the ID authentication may be impossible accidentally, it is possible to repeat the operation a predetermined number of times (for example, 3 times) in consideration of the convenience of the user (in order to save the trouble of repeatedly turning on the switch SW1). It is preferable to determine that the ID authentication has failed when the tries are allowed and the failures fail continuously (in the case of NG) (step S24).

  After the ID authentication, the power transmission device 10 starts normal power transmission to the power reception device 40 (step S26). When the switch (SW1) is pressed down (forced off) during the normal power transmission period (step S27), the normal power transmission is stopped and the initial state is restored (step S28).

  Further, as described above, removal detection (step S29), metal foreign object detection (step S30), secondary-side periodic load authentication (including secondary-side load reduction processing: step S31), and takeover state detection (step S32). When one of them is detected and detected, normal power transmission is stopped (step S33). Note that load reduction associated with periodic load authentication on the secondary side means that even if load modulation is performed with a heavy load (such as a battery), the modulation signal may not be received well on the primary side. This is a process of restricting (or stopping) the power supply to the main load when performing modulation and apparently forcibly reducing the load state of the main load (this point will be described in detail with reference to FIG. 17). To do).

  In FIG. 26, when detecting a full charge, the power receiving device 40 creates a full charge notification (save frame: power transmission stop request frame) and transmits it to the power transmission side (step S34). When detecting the full charge notification (power transmission stop request frame) (step S35), the power transmission device 10 turns off the normal power transmission and returns to the initial state (step S36).

  FIG. 27 is a state transition diagram showing a state transition of the non-contact power transmission system that executes the sequence of FIG. As shown in the figure, the system is in the initial state (idle state: ST1), position detection state (ST2), ID authentication state (ST3), power transmission (normal power transmission) state (ST4), periodic load authentication state (ST5). ) (As well as the load reduction state ST6).

  When the switch is turned on (Q1), transition is made from ST1 to ST2, and when the position detection is NG, the process returns to ST1 (Q2). If the position detection is OK, the process proceeds to ST3 (Q3), and it is watched whether the ID authentication is continuously failed a plurality of times (Q4). If it is NG continuously (Q5), the process returns to ST1. If ID authentication is OK (Q6), the process proceeds to ST4.

  In the normal power transmission state, SW1 off detection (Q7), removal detection (Q12), metal detection (Q10), takeover state detection (Q17), and full charge detection (Q14) are executed. (Q8, Q9, Q11, Q13, Q15).

  In the non-contact power transmission system that executes the basic sequence of FIG. 26, power transmission is started when the switch is turned on, and no power transmission is performed until then, so that low power consumption and improved safety can be achieved. . In addition, when a full charge notification (transmission stop request) is received, power transmission is stopped and the initial state (switch-on waiting state) is restored, so no unnecessary power transmission occurs here, reducing power consumption and improving safety. Is planned.

  In addition, since ID authentication is a condition for normal power transmission, power is not transmitted to an inappropriate device, and reliability and safety are improved.

  Also, during normal power transmission, various detection operations (removal detection, metallic foreign object detection, hijacking state detection based on secondary side load authentication, full charge detection) are executed, and when any one is detected, Since power transmission is quickly stopped and returned to the initial state, no unnecessary power transmission occurs, and all possible measures against foreign objects are taken, resulting in extremely high reliability (safety). A system is realized.

  28 and 29 are flowcharts showing an operation example of the non-contact power transmission system that executes the basic sequence of FIG. In FIGS. 28 and 29, the operation flow on the primary side is shown on the left side, and the operation flow on the secondary side is shown on the right side.

  As shown in FIG. 28, when the switch SW1 is turned on (step S40), temporary power transmission is started from the power transmission side (for example, the transmission frequency is f1: step S41), and counting by the timer is started (step S42). On the power receiving side, when provisional power transmission is received, the power is switched from the stopped state (step S60) to the power-on state (step S61), and position level determination (position detection) is executed. If the position level is NG, the process returns to the initial state (step S60). If OK, the creation of an ID authentication frame (S63) and the transmission of an ID authentication frame (step S64) are executed.

On the power transmission side, ID authentication frame reception processing (step S44) and timeout determination (step S43) are performed. If the ID authentication frame cannot be received within a predetermined time, power transmission is stopped (step S51). On the other hand, if the ID authentication frame is received within the predetermined time, the frame authentication process is executed (step S45). If the authentication is OK, the permission frame is transmitted to the power receiving side (step S47). Stops power transmission (step S51).
The power receiving side verifies the permission frame from the power transmission side (step S65), and transmits the start frame to the power transmission side (step S66).

  On the power transmission side, the start frame is verified (step S48), detection of periodic load fluctuation (for hijacking state detection) is turned on (step S49), and charging power transmission (normal power transmission) is started (step S50). The power receiving side receives charging power transmission (normal power transmission) and starts charging the main load (for example, a battery) (step S67). Subsequently, the subsequent flow will be described with reference to FIG. The power transmission side waits for a full charge notification (power transmission stop request) from the power receiving side (step S71) while detecting each of removal, metal foreign matter, hijacking state, and switch-off (step S70).

  On the power receiving side, regular load modulation for takeover detection is performed while charging the main load (step S80), and full charge of the main load is detected (step S81). When full charge is detected, a full charge notification frame (save frame: power transmission stop request) is transmitted to the power transmission side (step S82).

  On the power transmission side, when a full charge notification frame (save frame: power transmission stop request) is received from the power reception side, the periodic load fluctuation detection is turned off (step S72), and power transmission is stopped (step S73).

As described above, in the contactless power transmission system in the switch mode, the user can use the system as desired. In addition, power consumption can be kept low. That is, according to the contactless power transmission system in the switch mode according to the second embodiment, the following main effects can be obtained. However, the following effects are not always obtained at the same time, and the following list of effects should not be used as a basis for unduly limiting the technical scope of the present invention.
(1) In the contactless power transmission system in the switch mode, power transmission is started when the switch is turned on, and no power transmission is performed until then. Therefore, user convenience is improved, power consumption is reduced, and safety is ensured. Can be improved.
(2) When a full charge notification (transmission stop request) is received, power transmission is stopped and the initial state (switch-on waiting state) is returned, so no wasteful power transmission occurs at all, reducing power consumption and safety. Improvement is achieved.
(3) Since ID authentication is a condition for normal power transmission, power is not transmitted to an inappropriate device, and reliability and safety are improved.
(4) During normal power transmission, various detection operations (removal detection, metallic foreign object detection, takeover state detection based on secondary load authentication on the secondary side, full charge detection) are performed, and when any one is detected, Since normal power transmission is quickly stopped and returned to the initial state, no unnecessary power transmission occurs, and all possible countermeasures against foreign objects are taken, so extremely high reliability (safety) is achieved. System is realized.

  The present invention has been described above with reference to the embodiment. However, the present invention is not limited to this, and various modifications and applications are possible. That is, it will be readily understood by those skilled in the art that many modifications are possible without departing from the scope of the present invention.

  Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, in the specification or the drawings, terms (GND, mobile phone terminals / chargers, etc.) described at least once together with different terms (low-potential side power supply, electronic device, etc.) in a broader sense or the same meaning are used in the specification or drawings. Can be replaced by the different terms at any point. All combinations of the present embodiment and the modified examples are also included in the scope of the present invention.

  Further, the configuration and operation of the power transmission control device, the power transmission device, the power reception control device, the power reception device, and the method of detecting the load on the power reception side in the power transmission device are not limited to those described in the present embodiment, and various modifications may be made. Is possible.

  In the auto mode, continuous power transmission (power-save power transmission) using weak power can be used instead of intermittent power transmission to determine whether or not recharging after full charging is necessary. FIG. 30 is a diagram for describing the frequency of power save transmission after full charge. FIG. 30 shows the resonance characteristics of the primary coil L1. In the figure, f0 is a resonance frequency when there is a load, f1 is a frequency when “1” is transmitted, f2 is a frequency when “0” is transmitted, and f3 is a frequency when power save transmission is performed. That is, in the power save mode, continuous power transmission is performed using the frequency f3 farthest from the resonance frequency f0. Since power save transmission is continuous transmission, the power consumption slightly increases compared to intermittent transmission, but the charging control device 92 provided in the load 90 always operates by continuous power supply even after full charge. Therefore, there is an advantage that it is possible to always perform determination of whether or not recharging is necessary and removal detection.

  The present invention has the effect of providing a contactless power transmission system that is easy to use, has high reliability, and has low power consumption. Therefore, in particular, a power transmission control device (power transmission control IC), a power transmission device (IC module, etc.), It is useful as a non-contact power transmission system and an electronic device (for example, a portable terminal and a charger).

  In addition to the contactless power transmission system, the present invention can also be applied to other transmission system systems (for example, a power transmission system using a wired transmission system or a point contact transmission system that transmits power by connecting contacts to each other. System).

1A to 1C are diagrams showing an outline of a configuration example of a contactless power transmission system capable of switching between a switch mode and an auto mode. 2A to 2C are diagrams for explaining an example of an electronic device to which a contactless power transmission method is applied and a principle of contactless power transmission using an induction transformer. The circuit diagram which shows an example of the concrete structure of each part in the non-contact electric power transmission system containing a power transmission apparatus and a power receiving apparatus 4A and 4B are diagrams for explaining the principle of information transmission between the power transmission side device and the power reception side device. Diagram showing an example of installation of operation trigger switch and auto mode switch Diagram showing another installation example of operation trigger switch and auto mode switch Diagram showing another installation example of operation trigger switch and auto mode switch Flow chart showing an outline of an example of operation of the power transmission device Circuit diagram showing an example of configuration of power transmission side control circuit The figure which shows the example of basic sequence of non-contact electric power transmission system State transition diagram showing state transition of the non-contact power transmission system that executes the basic sequence of FIG. The flowchart which shows the operation example of the non-contact electric power transmission system which performs the basic sequence of FIG. The flowchart which shows the operation example of the non-contact electric power transmission system which performs the basic sequence of FIG. FIG. 14A and FIG. 14B are sequence diagrams showing a series of operation procedures for recharge management after full charge in the non-contact power transmission system. FIG. 15 is a flowchart showing an operation procedure of the non-contact power transmission system that automatically performs a series of operations of ID authentication, normal power transmission, full charge detection, and recharge management. Diagram for explaining the principle of position detection FIG. 17A to FIG. 17F are diagrams for explaining the principle of metal foreign matter (conductive foreign matter) detection. FIGS. 18A to 18D are diagrams for explaining the principle of removal detection. FIGS. 19A and 19B are cross-sectional views of electronic devices constituting a non-contact power transmission system for explaining foreign object insertion (takeover state) after normal power transmission is started. FIG. 20A and FIG. 20B are diagrams for explaining specific modes when the load on the power receiving device side is changed intermittently so that foreign object insertion can be detected. The circuit diagram which extracts and shows the main components related to the detection of foreign object insertion (takeover state) from the non-contact power transmission system shown in FIG. 22 (A) and 22 (B) are diagrams for explaining preferred and specific modes of load modulation for enabling foreign object detection. 23A to 23E are diagrams for explaining the load reducing operation. Flow chart showing an outline of an example of operation of the power transmission device in the switch mode Circuit diagram showing an example of configuration of power transmission side control circuit in switch mode The figure which shows the example of basic sequence of non-contact electric power transmission system State transition diagram showing the state transition of the non-contact power transmission system that executes the sequence of FIG. The flowchart which shows the operation example of the non-contact electric power transmission system which performs the basic sequence of FIG. The flowchart which shows the operation example of the non-contact electric power transmission system which performs the basic sequence of FIG. Illustration for explaining the frequency of power-save transmission after full charge

Explanation of symbols

L1 primary coil, L2 secondary coil, 10 power transmission device, 12 power transmission unit,
14 waveform monitor circuit, 16 display unit, 20 power transmission control device, 22 power transmission side control circuit,
24 oscillation circuit, 26 driver control circuit, 28 waveform detection circuit, 40 power receiving device,
42 power receiving unit, 43 rectifier circuit, 46 load modulation unit, 48 power feeding control unit,
50 power reception control device, 52 power reception side control circuit, 56 position detection circuit, 58 oscillation circuit,
60 frequency detection circuit, 62 full charge detection circuit, 90 load on power receiving side device,
92 charge control device (charge control IC), 94 battery (secondary battery) as a load,
LEDR Light-emitting device as an indicator of battery level and battery status

Claims (18)

A power transmission control device provided in the power transmission device in a non-contact power transmission system for transmitting power from a power transmission device to a power reception device in a contactless manner via an electromagnetically coupled primary coil and secondary coil. ,
After automatically detecting that the power receiving device having the power receiving device is installed in a place where power can be received by contactless power transmission, normal power transmission for supplying power to the load of the power receiving device is started. An operation mode switching terminal for inputting an operation mode switching control signal for switching between the auto mode for performing the normal power transmission after the operation trigger switch is turned on, and
An operation trigger terminal for inputting an operation trigger signal generated by operation of the operation trigger switch;
A power transmission side control circuit that controls power transmission to the power receiving device and switches an operation mode of the power transmission device based on the operation mode switching control signal;
Have
The power transmission side control circuit is:
When the auto mode is selected by the operation mode switching control signal, the power receiving device performs intermittent temporary power transmission, and detects the response from the power receiving device that has received the intermittent temporary power transmission. The installation of the side device is detected, and when the installation is detected, the power transmission device performs the continuous normal power transmission to the power reception device, and when the installation is not detected, the power transmission device is intermittently operated. the state to run the temporary power transmission allowed to continue,
When the switch mode is selected by the operation mode switching control signal, the power transmission control device performs control to start the normal power transmission or non-intermittent temporary power transmission on condition that the operation trigger switch is turned on . The power transmission control device according to claim 1,
  The power transmission side control circuit is:
  When the switch mode is selected by the operation mode switching control signal, the power transmission control device performs control to stop the normal power transmission or the non-intermittent temporary power transmission based on the input of the operation trigger signal. . The power transmission control device according to claim 1 or 2 ,
The power transmission side control circuit is:
Wherein regardless of either automatic mode and the switch mode is selected, before the normal power transmission, and executes the processing of ID authentication, whether the power-receiving-side instrument has adaptability to the non-contact power transmission system A power transmission control device that determines whether or not and makes the power transmission device execute the normal power transmission after the ID authentication is successful. The power transmission control device according to claim 3 ,
When the auto mode is selected by the operation mode switching control signal,
The power transmission side control circuit is:
Or the power transmitting device wherein to execute the intermittent temporary power transmission to, within a predetermined from the start of the intermittent temporary power transmission times, can receive the ID authentication information from the power receiving device that has received the intermittent temporary power transmission By detecting whether or not the installation of the power receiving device having the power receiving device,
When the installation of the power-receiving-side instrument has been detected, on condition that succeed the ID authentication, the power transmitting device, to execute the normal power transmission to the power receiving device,
If you can not receive the ID authentication information from the power receiving device from the start of the intermittent temporary power transmission within a predetermined time, and if it fails the ID authentication, the power transmission device, the intermittent temporary power transmission The power transmission control apparatus characterized by continuing the state which performs. The power transmission control device according to claim 4 ,
The power transmission side control circuit is:
Upon detecting a full charge notification from the power receiving device during the normal power transmission period, the power transmission device stops the normal power transmission,
Execute power transmission for detection of removal after full charge and power transmission for determination of necessity of recharge after full charge,
When the removal is detected on the basis of a signal transmitted from the power receiving device that has received power transmission for detection of removal after full charge, the power transmission device performs the intermittent temporary power transmission. To return to
When it is determined that recharging is necessary based on a signal transmitted from the power receiving device that has received power transmission for determining whether or not recharging after full charging is required, the normal power transmission is performed on the power transmitting device. A power transmission control device that is restarted. The power transmission control device according to claim 3 ,
When the switch mode is selected by the operation mode switching control signal,
The power transmission side control circuit is:
As a trigger on the operation trigger switch provided in the power-transmission-side instrument, in order to enable the processing of the ID authentication, the to execute the non-intermittent temporary power transmission to the power receiving device to the transmitting device,
Wherein within a predetermined time from the time of starting the non-intermittent temporary power transmission, wherein upon receiving the ID authentication information from the power receiving device that has received the non-intermittent temporary power transmission, the ID authentication based on the ID authentication information After executing the process and succeeding in the ID authentication, the power transmission device is caused to execute the normal power transmission to the power reception device, and from the power reception device within the predetermined time from the time when the non-intermittent temporary power transmission is started. When the ID authentication information cannot be received and when the ID authentication fails, the power transmission device is controlled to return to an initial state where the non-intermittent temporary power transmission is stopped and the operation trigger switch is turned on. A power transmission control device. The power transmission control device according to claim 6 ,
When the power transmission side control circuit receives a full charge notification from the power receiving device after the start of the normal power transmission, the power transmission device returns to the initial state where the normal power transmission is stopped and the operation trigger switch is turned on. A power transmission control device characterized by controlling as described above. A power transmission control device according to any one of claims 1 to 7 ,
The power transmission side control circuit determines the presence / absence of a foreign object based on a change in the waveform of the induced voltage signal of the primary coil, and causes the power transmission device to stop the normal power transmission when the foreign object is detected during the normal power transmission. A power transmission control device. A power transmission control device provided in the power transmission device in a non-contact power transmission system for transmitting power from a power transmission device to a power reception device in a contactless manner via an electromagnetically coupled primary coil and secondary coil. ,
After automatically detecting that the power receiving device having the power receiving device is installed in a place where power can be received by contactless power transmission, normal power transmission for supplying power to the load of the power receiving device is started. An operation mode switching terminal for inputting an operation mode switching control signal for switching between the auto mode for performing the normal power transmission after the operation trigger switch is turned on, and
An operation trigger terminal for inputting an operation trigger signal generated by operation of the operation trigger switch;
A power transmission side control circuit that controls power transmission to the power receiving device and switches an operation mode of the power transmission device based on the operation mode switching control signal;
Have
The power transmission side control circuit is:
When the auto mode is selected by the operation mode switching control signal, the power receiving device performs intermittent temporary power transmission, and detects the response from the power receiving device that has received the intermittent temporary power transmission. The installation of the side device is detected, and when the installation is detected, the power transmission device performs the continuous normal power transmission to the power reception device, and when the installation is not detected, the power transmission device is intermittently operated. The state of executing temporary power transmission
When the switch mode is selected by the operation mode switching control signal, the power transmission device is configured to repeatedly start and stop power transmission to the power reception device each time the operation trigger signal is input to the operation trigger terminal. the power transmission control unit and controls. A power transmission control device provided in a power transmission device that transmits power by contactless power transmission to a power receiving device,
A first terminal to which a first signal is input;
A second terminal to which a second signal is input;
A power transmission control circuit for controlling the power transmission device;
Including
The power transmission control circuit operates the power transmission device in the first operation mode or the second operation mode based on the first signal,
In the first operation mode, installation of the power receiving device is detected by causing the power transmission device to perform intermittent temporary power transmission and detecting a response from the power receiving device that has received the intermittent temporary power transmission. When the installation is detected, the power transmission device performs the continuous normal power transmission to the power reception device, and when the installation is not detected, the power transmission device performs the intermittent temporary power transmission. Continue
Wherein in the second operation mode, the power transmission control unit and performs control for starting the normal power transmission or non-intermittent temporary power transmission based on the previous SL second signal. The power transmission control device according to claim 10,
  In the second operation mode, the power transmission control device performs control to stop the normal power transmission or the non-intermittent temporary power transmission based on the second signal. A power transmission device comprising: the power transmission control device according to any one of claims 1 to 11 ; and a power transmission unit that generates an alternating voltage and supplies the alternating voltage to the primary coil. 13. An electronic apparatus comprising: the power transmission device according to claim 12; an operation mode changeover switch for generating the operation mode changeover control signal; and the operation trigger switch. The electronic device according to claim 13 ,
An electronic apparatus, wherein the operation mode changeover switch is provided at a place where a user can operate the operation mode changeover switch. The electronic device according to claim 13 ,
The operation mode change-over switch is provided in a place where a user cannot operate the electronic device. The electronic device according to any one of claims 13 to 15 ,
An electronic apparatus comprising a plurality of the operation mode changeover switches. A contactless power transmission system for transmitting power from a power transmission device to a power reception device in a contactless manner via an electromagnetically coupled primary coil and secondary coil,
The power transmission device includes a power transmission side control device that controls power transmission to the power reception device based on an induced voltage of a primary coil, and the power transmission control device automatically installs a power reception side device having the power reception device. detected, the automatic mode to start the normal power transmission through the processing of the ID authentication starts power transmission as a trigger to turn oN the operation trigger switch, for switching, and a switch mode for starting the normal power transmission through the processing of the ID authentication The operation mode switching terminal to which the operation mode switching control signal is input, the operation trigger terminal to which the operation trigger signal generated by the operation of the operation trigger switch is input, the power transmission to the power receiving device are controlled, and the operation mode A power transmission side control circuit that receives the switching control signal and switches the operation mode of the power transmission device;
The power reception device includes a power supply control unit that controls power supply to a load, and a power reception control device that includes a power reception side control circuit that controls the power reception device,
The power transmission side control circuit of the power transmission device is:
When the auto mode is selected by the operation mode switching control signal, intermittent temporary power transmission is executed, and the intermittent temporary power transmission is received within a predetermined time from the start time of the intermittent temporary power transmission. By detecting whether or not ID authentication information can be received from the power receiving device, the installation of the power receiving device having the power receiving device is detected,
When installation of the power-receiving-side instrument has been detected, the power transmitting device on a condition that a successful processing of the ID authentication, to perform the normal power transmission to the power receiving device,
If you can not receive the ID authentication information from the power receiving device from the start of the intermittent temporary power transmission within a predetermined time, and if it fails the ID authentication, the power transmitting device, the intermittent temporary power transmission To the state to execute,
If the switch mode is selected by the operation mode switch control signal, in response to turn ON the switch provided on the power transmission side apparatus, in order to enable the processing of the ID authentication, to said power receiving apparatus to the transmitting device Perform non-intermittent temporary power transmission,
Wherein within a predetermined time from the time of starting the non-intermittent temporary power transmission, when receiving the ID authentication information from the power receiving device that has received the non-intermittent temporary power transmission, the ID authentication based on the ID authentication information After the ID authentication is successful, the power transmission device causes the power transmission device to execute the normal power transmission to the power reception device, and from the power reception device within a predetermined time from the start of the non-intermittent temporary power transmission. When the ID authentication information cannot be received and when the ID authentication fails, the power transmission device is controlled to return to the initial state where the non-intermittent temporary power transmission is stopped and the switch is turned on. A contactless power transmission system. The contactless power transmission system according to claim 17 ,
When the automatic mode is selected by the operation mode switching control signal, the power transmission side control circuit detects the full charge notification from the power receiving device during the normal power transmission period, and transmits the normal power transmission to the power transmission device. Stop and
Execute power transmission for detection of removal after full charge and power transmission for determination of necessity of recharge after full charge,
When the removal is detected on the basis of a signal transmitted from the power receiving device that has received power transmission for detection of removal after full charge, the power transmission device performs the intermittent temporary power transmission. To return to
When it is determined that recharging is necessary based on a signal transmitted from the power receiving device that has received power transmission for determining whether or not recharging after full charging is required, the normal power transmission is performed on the power transmitting device. A contactless power transmission system that is restarted.

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