JP2011061893A - Power transmission and reception control unit, power transmitting and receiving apparatus, electronic apparatus and control method - Google Patents

Abstract

A power transmission / reception control device, a power transmission / reception device, an electronic device, a control method, and the like capable of efficient power transmission / reception are provided.
A contactless power transmission power transmission / reception control device 120 includes a control unit 130 that controls a power transmission / reception unit 110 that performs transmission and reception of contactless power transmission, and a detection unit 140. The control unit 130 includes: In the standby state, the control mode of the power transmission / reception unit 110 is set to the power reception mode, and when the detection unit 140 detects a power transmission request from the counterpart device, the control mode of the power transmission / reception unit 110 is set to the power transmission mode.
[Selection] Figure 2

Description

  The present invention relates to a power transmission / reception control device, a power transmission / reception device, an electronic device, a control method, 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 mobile devices such as telephones has been proposed. Among them, if contactless power transmission can be performed between portable devices, for example, a portable computer can be charged from a portable computer when going out, which is extremely convenient.

  For example, Patent Document 1 discloses a power transmission / reception combined device that operates by switching between power transmission and power reception. However, this method has problems such as the need for a power transmission circuit and a power reception circuit, and difficulty in reducing power consumption during standby.

JP-A-2005-143181

  According to some aspects of the present invention, it is possible to provide a power transmission / reception control device, a power transmission / reception device, an electronic device, a control method, and the like capable of efficient power transmission / reception.

  One aspect of the present invention is a power transmission / reception control device for contactless power transmission, including a control unit that controls a power transmission / reception unit that performs transmission and reception of the contactless power transmission, and a detection unit, and the control unit Sets the control mode of the power transmission / reception unit to the power reception mode in the standby state, and sets the control mode of the power transmission / reception unit to the power transmission mode when the detection unit detects a power transmission request from the counterpart device. Related to the power reception control device.

  According to one embodiment of the present invention, in the standby state (initial state), the power transmission / reception unit is set to the power reception mode, so that power consumption during standby can be reduced. In addition, since a power transmission mode is set when a power transmission request from the counterpart device is detected, unnecessary power transmission can be avoided.

  In one aspect of the present invention, the control unit controls the power transmission / reception unit when the power transmission request is detected and connection of an external power source is detected or when the battery voltage is higher than a predetermined voltage. The mode may be set to the power transmission mode.

  In this way, the control unit can be set to the power transmission mode on condition that an external power source is connected or the remaining battery level is sufficient. The situation where it becomes impossible can be avoided.

  Also, in one aspect of the present invention, the control unit is instructed to transmit power by switching a host or an external switch, and when the connection of the external power source is detected or the battery voltage is higher than the predetermined voltage. The control mode of the power transmission / reception unit may be set to the power transmission mode.

  In this way, unnecessary power transmission can be avoided, and it is possible to set the power transmission mode on condition that an external power source is connected or the remaining battery level is sufficient. It is possible to avoid a situation where the battery becomes exhausted and becomes inoperable.

  In the aspect of the invention, the power transmission / reception unit includes a first transistor provided between a first power supply node and a first node on one end side of the contactless power transmission coil, and the first transistor. A second transistor provided between the node and the second power supply node; and a third transistor provided between the first power supply node and the second node on the other end side of the contactless power transmission coil. And a fourth transistor provided between the second node and the second power supply node, between the first coil end node and the first node, and second A capacitor is provided in at least one of the coil end node and the second node, and the control unit turns off the first to fourth transistors in the standby state, and First The transistor ~ the fourth transistor body diode of the transistor of the may be performed rectifying operation of the power reception mode.

  In this way, since the rectification operation can be realized using the body diode with each transistor of the power transmission / reception unit turned off, the power consumption in the power reception mode can be reduced.

  In the aspect of the invention, the control unit may turn on the first transistor and the fourth transistor and turn off the second transistor and the third transistor. The power transmission control in the power transmission mode may be performed by alternately repeating the operation of turning off the first transistor and the fourth transistor and turning on the second transistor and the third transistor. .

  If it does in this way, it will become possible to perform both power reception control and power transmission control by controlling ON / OFF of each transistor of a power transmission / reception part.

  In one aspect of the present invention, when the power transmission / reception unit is set to a power transmission / reception mode in which power transmission / reception is performed simultaneously, the control unit receives the power received by the power transmission / reception unit from the first counterpart device. You may perform control which transmits electric power to 2 partner apparatuses.

  If it does in this way, non-contact electric power transmission will be carried out from the 1st partner apparatus (electronic device) to the 2nd partner apparatus (electronic device) via electronic equipment containing the power transmission / reception control device set as power transmission / reception mode. It becomes possible to do.

  Another aspect of the present invention is a power transmission / reception control device for contactless power transmission, including a control unit that controls a power transmission / reception unit that performs transmission and reception of the contactless power transmission, and a detection unit, wherein the control In a standby state, the unit sets the control mode of the power transmission / reception unit to a power reception mode, when power transmission is instructed by switching of a host or an external switch, and connection of an external power source is detected or a battery voltage is a predetermined voltage The power transmission / reception control device sets the control mode of the power transmission / reception unit to a power transmission mode when the power transmission / reception unit is higher.

  Another aspect of the present invention relates to a power transmission / reception device including the power transmission / reception control device described above and the power transmission / reception unit.

  Another aspect of the present invention relates to an electronic apparatus including the power transmission / reception device described above.

  Another aspect of the present invention is a contactless power transmission control method, in the standby state, when the control mode of the power transmission / reception unit is set to the power reception mode, and a power transmission request from the counterpart device is detected by the detection unit Furthermore, the present invention relates to a control method for setting the control mode of the power transmission / reception unit to a power transmission mode and supplying power to the counterpart device by the contactless power transmission.

1A is an example of an electronic device, and FIGS. 1B and 1C are explanatory diagrams of contactless power transmission. The basic structural example of a power transmission / reception apparatus and a power transmission / reception control apparatus. The detailed structural example of a power transmission / reception apparatus and a power transmission / reception part. 4A and 4B are examples of a power transmission / reception device and a power transmission / reception control device. 5A to 5C are examples of electronic devices including a power transmission / reception device. An example of the operation | movement flow of a power transmission / reception apparatus. An example of the operation | movement flow of a power transmission / reception apparatus.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are indispensable as means for solving the present invention. Not necessarily.

1. Electronic Device FIG. 1A shows an example of an electronic device of this embodiment. The first electronic device 300 includes a power transmission / reception device 100. The second electronic device 400 includes a power transmission / reception device 200. The second electronic device 400 is, for example, a portable device, and includes a display unit 401 such as an LCD, and an operation unit 402 including buttons and the like.

  As will be described later, the power transmission / reception devices 100 and 200 according to the present embodiment operate as a power transmission device for contactless power transmission and also operate as a power reception device. For example, the battery of the second electronic device 400 is charged by operating the power transmission / reception device 100 of the first electronic device 300 as the power transmission device and operating the power transmission / reception device 200 of the second electronic device 400 as the power reception device. can do. At this time, the first electronic device 300 may receive power from an external power source using, for example, the AC adapter 301 or the like, or the first electronic device 300 has a built-in battery, and the remaining battery level is sufficient. If so, the battery power may be used.

  As described above, according to the power transmission / reception device of this embodiment, one electronic device functions as the power transmission side and the power reception side. For example, when two portable devices (electronic devices) are brought out, When the battery of one portable device is exhausted, the battery of the other portable device can be easily charged by contactless power transmission.

  Note that various electronic devices such as a mobile phone, a wristwatch, a cordless telephone, a notebook PC (Personal Computer), a handy terminal, and a portable information terminal can be assumed as electronic devices to which the present embodiment is applied.

  As schematically shown in FIG. 1B, power transmission between the power transmitting and receiving apparatuses 100 and 200 is performed by a coil L1 provided on the power transmitting and receiving apparatus 100 side and a coil L2 provided on the power transmitting and receiving apparatus 200 side. This is realized by forming a power transmission transformer by electromagnetically coupling the two. Thereby, non-contact power transmission becomes possible.

  In FIG. 1B, the coils L1 and L2 are, for example, air-core planar coils formed by winding a coil wire in a spiral shape on a plane. However, the coil of the present embodiment is not limited to this, and any shape or structure may be used as long as it can transmit power by electromagnetically coupling the coils L1 and L2.

  For example, in FIG. 1C, the coil L1 is formed by winding a coil wire spirally around the X axis with respect to the magnetic core. The same applies to the coil L2 provided in the electronic apparatus 400. In this embodiment, the present invention can also be applied to a coil as shown in FIG. In the case of FIG. 1C, as the coil L1 and the coil L2, in addition to the coil wound around the X axis, a coil wound around the Y axis may be combined.

2. Power Transmission / Reception Device and Power Transmission / Reception Control Device FIG. 2 shows a basic configuration example of the power transmission / reception device and power transmission / reception control device of this embodiment. The power transmission / reception device 100 includes a power transmission / reception unit 110 and a power transmission / reception control device 120. Furthermore, the power transmission / reception control device 120 includes a control unit 130 and a detection unit 140.

  The electronic device 300 includes the power transmission / reception device 100, and further includes a charge / discharge control device 310, a battery 320, an external power supply terminal 330, a host 340, and switches SA1 and SB1.

  FIG. 2 also illustrates a basic configuration example of an electronic device 400 that is a counterpart device of the electronic device 300. The electronic device 400 includes a power transmission / reception device 200, and further includes a charge / discharge control device 410, a battery 420, an external power supply terminal 430, a host 440, and switches SA2 and SB2. The power transmission / reception device 200 includes a power transmission / reception unit 210 and a power transmission / reception control device 220. Furthermore, the power transmission / reception control device 220 includes a control unit 230 and a detection unit 240.

  Note that the electronic device, the power transmission / reception device, and the power transmission / reception control device of the present embodiment are not limited to the configuration in FIG. 2, and some of the components are omitted, replaced with other components, or other components. Various modifications, such as adding, are possible.

  The power transmission / reception unit 110 performs transmission and reception of contactless power transmission. Specifically, an AC voltage is generated and supplied to the coil L1 during power transmission, and an AC induced voltage of the coil L1 is converted into a DC voltage during power reception.

  The control unit 130 controls the power transmission / reception unit 110 by setting a control mode of the power transmission / reception unit 110. In addition, the control unit 130 performs various sequence controls and determination processes necessary for contactless power transmission. For example, the control unit 130 determines whether to permit power transmission to the partner apparatus based on the result of the authentication process based on the authentication information from the partner apparatus (the other electronic device 400). This authentication information includes, for example, information about the coil, and based on this information, it is determined whether or not the power transmission side coil and the power reception side coil are compatible. The control unit 130 can be realized by an ASIC circuit such as a gate array, or can be realized by a microcomputer and a program operating on the microcomputer.

  The detection unit 140 detects a power transmission request from the counterpart device, the voltage of the battery 320, connection of an external power source, landing of the counterpart device, removal of the counterpart device, and the like.

  Setting of the control mode by the control unit 130 is performed as follows. The control unit 130 sets the control mode of the power transmission / reception unit 110 to the power reception mode in the standby state, and sets the control mode of the power transmission / reception unit 110 to the power transmission mode when the detection unit 140 detects a power transmission request from the counterpart device. To do.

  Further, the control unit 130 sets the control mode of the power transmission / reception unit 110 to the power transmission mode when the above power transmission request is detected and the connection of the external power source is detected or when the voltage of the battery 320 is higher than a predetermined voltage. May be set. This predetermined voltage may be in a voltage range in which power can be transmitted to the counterpart device using battery power.

  In addition, the control unit 130 instructs the power transmission / reception unit 110 when power transmission is instructed by switching the host 340 or the external switch, and when connection of an external power source is detected or when the voltage of the battery 320 is higher than a predetermined voltage. The control mode may be set to the power transmission mode.

  In addition, when the connection of the external power source is detected, the control unit 130 turns on the switch SB1 and turns off the switch SA1. On the other hand, when the connection of the external power source is not detected, the switch SB1 is turned off and the switch SA1 is turned on.

  The operations of the power transmission / reception device 200 and the power transmission / reception control device 220 included in the electronic device 400 are the same as those described above. The control unit 230 sets the control mode of the power transmission / reception unit 210 to the power reception mode in the standby state, and sets the control mode of the power transmission / reception unit 210 to the power transmission mode when the detection unit 140 detects a power transmission request from the counterpart device. To do.

  Further, the control unit 230 sets the control mode of the power transmission / reception unit 210 to the power transmission mode when the above power transmission request is detected and the connection of the external power source is detected or when the voltage of the battery 420 is higher than a predetermined voltage. May be set.

  Further, the control unit 230 instructs the power transmission / reception unit 210 when power transmission is instructed by switching the host 440 or the external switch, and when the connection of the external power source is detected or when the voltage of the battery 420 is higher than a predetermined voltage. The control mode may be set to the power transmission mode.

  In addition, when the connection of the external power source is detected, the control unit 230 turns on the switch SB2 and turns off the switch SA2. On the other hand, when the connection of the external power source is not detected, the switch SB2 is turned off and the switch SA2 is turned on.

  A specific description will be given of how the control mode is set for the power transmitting and receiving apparatuses 100 and 200 shown in FIG. For example, the case where the electronic device 300 is set to the power transmission side and the electronic device 400 is set to the power reception side will be described below.

  In the initial state or the standby state, the two electronic devices 300 and 400 are both set to the power receiving mode. In this power reception mode, power transmission through the coils L1 and L2 is not performed, so that power consumption during standby can be kept low.

  One method of setting the electronic device 300 to the power transmission mode is that the electronic device 400 (partner device) transmits a power transmission request to the electronic device 300. The transmission of the power transmission request is performed by the control unit 230 controlling the power transmission / reception unit 210 with the control signal CN2 based on, for example, an instruction from the host 440 or an instruction from the external switch SR2.

  Specifically, the control unit 230 generates an AC voltage at both ends of the coil L2 by turning on and off a plurality of transistors included in the power transmission / reception unit 210 according to the control signal CN2, and the coil of the electronic device 300 is electromagnetically coupled. An alternating voltage is generated at L1. Furthermore, the control unit 230 can transmit a power transmission request signal by performing frequency modulation, amplitude modulation, or the like on the AC signal using the control signal CN2. In this case, power for transmitting the power transmission request signal is consumed. However, since power transmission is not performed, power consumption can be kept low.

  In this way, when the detection unit 140 of the electronic device 300 detects the power transmission request signal RQ1 from the coil L1, the control unit 130 sets the control mode to the power transmission mode based on the detection request signal RQ1. Alternatively, the control unit 130 switches the control mode to the power transmission mode when the power transmission request signal RQ1 is detected and the voltage VX1 from the external power supply terminal 330 is detected or when the voltage VB1 of the battery 320 is higher than a predetermined voltage. Set to. In this way, the power transmission mode can be set on the condition that an external power source is connected or the remaining battery level is sufficient. Can be avoided.

  Another method of setting the electronic device 300 to the power transmission mode is to instruct power transmission from the host 340 of the power transmission side electronic device 300 itself or the external switch ST1. Specifically, the host 340 or the external switch ST1 instructs the control unit 130 to transmit power, and based on this, the control unit 130 sets the control mode to the power transmission mode. At this time, when the voltage VX1 from the external power supply terminal 330 is detected or when the voltage VB1 of the battery 320 is higher than a predetermined voltage, the control mode is set to the power transmission mode. In this way, the power transmission mode can be set on the condition that an external power source is connected or the remaining battery level is sufficient. Can be avoided.

  The power transmission process in the power transmission mode is performed by the control unit 130 turning on / off a plurality of transistors included in the power transmission / reception unit 110 by the control signal CN1.

  The case where the electronic device 300 is set to the power transmission side and the electronic device 400 is set to the power reception side has been described above. However, in the opposite case, that is, the electronic device 300 is set to the power reception side and the electronic device 400 is set to the power transmission side. Is the same as above.

  As described above, according to the power transmission / reception device of this embodiment, one electronic device functions as both a power transmission side and a power reception side. For example, bring two portable devices (electronic devices) and go out. When the battery of one portable device is exhausted, the battery of the other portable device can be easily charged by contactless power transmission. When an external power source can be used, charging can be performed by contactless power transmission from the external power source.

  Further, according to the power transmission / reception device of the present embodiment, the electronic device is set to the power reception mode (power reception side) in the initial state (standby state), and the power transmission request from the counterpart device (another electronic device) or the host or When there is an instruction from the external switch, the power transmission mode (power transmission side) is set. By doing so, power consumption during standby can be kept low, and unnecessary power transmission can be avoided.

  Furthermore, according to the power transmission / reception device of this embodiment, the electronic device is set to the power transmission mode (power transmission side) on the condition that the connection of the external power source is detected or the battery voltage is higher than the predetermined voltage. Is done. By doing so, it is possible to avoid a situation in which the battery of the power transmission side electronic device is exhausted and becomes inoperable.

  Note that the power transmission / reception device according to the present embodiment may be configured to have no function of setting the power transmission mode in response to a power transmission request from the counterpart device. In this configuration, the power transmission mode is set when power transmission is instructed by switching of the host or the external switch.

  FIG. 3 shows a detailed configuration example of the power transmission / reception apparatus and power transmission / reception unit of the present embodiment. The power transmission / reception unit 110 includes first to fourth transistors T1 to T4.

  The first transistor T1 is provided between the high potential side power supply node VDD (first power supply node in a broad sense) and the first node N1 on one end side of the contactless power transmission coil L1. The second transistor T2 is provided between the first node N1 and the low potential side power supply node VSS (second power supply node in a broad sense). The third transistor T3 is provided between the high potential side power supply node VDD (first power supply node in a broad sense) and the second node N2 on the other end side of the contactless power transmission coil L1. The fourth transistor is provided between the second node N2 and the low potential side power supply node VSS (second power supply node in a broad sense).

  Furthermore, the power transmission / reception unit 110 may include a fifth transistor T5. The fifth transistor T5 is provided between the first node N1 or the second node N2 and the low potential side power supply node VSS (second power supply node in a broad sense). The fifth transistor T5 is for performing load modulation in the power receiving mode. This load modulation is used to transmit authentication information, power transmission conditions, and the like from the power receiving side to the power transmission side.

  In FIG. 3, the first to fifth transistors T1 to T5 are N-type transistors, but may be P-type transistors.

  The control unit 130 controls the gates of the first to fifth transistors T1 to T5 of the power transmission / reception unit 110 by the control signals CNT1 to CNT5.

  In FIG. 3, the capacitor CA is provided between the first coil end node NC1 and the first node N1 of the coil L1. However, the capacitor CA may be provided between the second coil end node NC2 and the second node N2 of the coil L1, or may be provided on both. That is, the capacitor CA may be provided between at least one of NC1 and N1 and between NC2 and N2.

  Note that the power transmission / reception device and power transmission / reception control device of the present embodiment are not limited to the configuration in FIG. 3, and some of the components are omitted, replaced with other components, or other components are added. Various modifications such as these are possible.

  The operation of the power transmission / reception unit 110 in the power reception mode will be described with reference to FIG. In the standby state, the controller 130 turns off the first to fourth transistors T1 to T4, and performs a rectifying operation in the power reception mode by the body diodes D1 to D4 of the respective transistors of the first to fourth transistors T1 to T4. I do.

  Specifically, the following rectification operation is performed. For example, when the first coil end node NC1 becomes high potential and the second coil end node NC2 becomes low potential due to the AC voltage induced in the coil L1, the capacitor CA and the body diode D1 are connected from NC1. A current flows through the high-potential power supply node VDD and the current returns from the low-potential power supply node VSS to the NC2 through the body diode D4. As a result, the smoothing capacitor CB provided between VDD and VSS is charged.

  On the other hand, when the first coil end node NC1 becomes low potential and the second coil end node NC2 becomes high potential, current flows from NC2 through the body diode D3 to the high potential side power supply node VDD. In addition, the current returns from the low potential side power supply node VSS to the NC 2 through the body diode D2 and the capacitor CA. As a result, the smoothing capacitor CB is further charged.

  By repeating such a rectification operation, a sufficient DC voltage is generated in the smoothing capacitor CB, which can be used for charging a power source of an electronic device or a battery. Although not shown in FIG. 3, the DC voltage can be further stabilized by using a regulator.

  Next, operation | movement of the power transmission / reception part 110 in power transmission mode is demonstrated using FIG. The control unit 130 turns on the first transistor T1 and the fourth transistor T4 and turns off the second transistor T2 and the third transistor T3, and the first transistor T1 and the fourth transistor. The power transmission control in the power transmission mode is performed by alternately repeating the operation of turning off the T4 and turning on the second transistor T2 and the third transistor T3.

  Specifically, for example, when the first and fourth transistors T1 and T4 are turned on and the second and third transistors T2 and T3 are turned off, the high potential side power supply node VDD passes through T1. Then, a current flows to the coil L1, and further from L1 to T4 to the low potential side power supply node VSS. On the other hand, when the first and fourth transistors T1 and T4 are turned off and the second and third transistors T2 and T3 are turned on, the high potential side power supply node VDD passes through T3 to the coil L1. Further, a current flows from L1 through T2 to the low potential side power supply node VSS. In this case, the direction of the current flowing through L1 is opposite to that in the former case. Therefore, the coil L1 can be driven with an alternating voltage by alternately repeating these two operations.

  As described above, according to the power transmission / reception device and the power transmission / reception control device of the present embodiment, the power transmission / reception unit performs power transmission operation and power reception operation by controlling on / off of the plurality of transistors included in the power transmission / reception unit. The following two operations can be performed.

3. Application Examples of Power Transmission / Reception Device and Power Transmission / Reception Control Device FIGS. 4A and 4B show examples of the power transmission / reception device and the power transmission / reception control device of the present embodiment. The configuration example illustrated in FIG. 4A can be set to a power transmission / reception mode in which the power transmission / reception unit 110b performs power transmission and power reception at the same time. Including two coils LA and LB, LA can be set on the power transmission side and LB can be set on the power reception side, and vice versa. The control unit 130b can control the LA side of the power transmission / reception unit 110b by the control signal CNA, and can control the LB side of the power transmission / reception unit 110b by the control signal CNB.

  Thus, for example, when the coil LA is set on the power receiving side and the coil LB is set on the power transmission side, the power received by the LA can be transmitted by the LB.

  In FIG. 4B, an electronic device 300b including the power transmission / reception device 100b set in the power transmission / reception mode, a first counterpart device (electronic device) 300a including the power transmission / reception device 100a set in the power transmission mode, A second counterpart device (electronic device) 300c including a power transmission / reception device 100c set in a power reception mode is shown. In the electronic device 300b set in the power transmission / reception mode, the control unit 130b performs control to transmit the power received by the power transmission / reception unit 110b from the first counterpart device 300a to the second counterpart device 300c.

  If it does in this way, non-contact electric power transmission will be carried out from the 1st partner apparatus (electronic device) to the 2nd partner apparatus (electronic device) via electronic equipment containing the power transmission / reception control device set as power transmission / reception mode. It can be carried out. As a result, for example, even when the coil standard of the first electronic device and the coil standard of the second electronic device are not compatible and contactless power transmission cannot be performed, the electronic device set in the power transmission / reception mode is not used. Power transmission can be made possible by using the relay.

  5A to 5C show examples of electronic devices including the power transmission / reception device of this embodiment. FIG. 5A illustrates an electronic device 300 including one power transmission / reception coil L1. The power transmission / reception coil L1 is, for example, the coil L1 shown in FIGS. 2 and 3 described above, and operates as a power reception coil or as a power transmission coil by switching the control mode by the control unit.

  FIG. 5B illustrates an electronic device 300 including two power transmission / reception coils LA and LB. These power transmission / reception coils LA and LB are, for example, the coils LA and LB shown in FIG. 4A, and one can operate as a power transmission coil and the other can operate as a power reception coil at the same time.

  FIG. 5C illustrates an electronic device 300 including a power transmission coil LC and a power reception coil LD. The power transmission coil LC performs a power transmission operation, and the power reception coil LD performs a power reception operation. These two coils LC and LD may operate simultaneously or separately.

  5B and 5C, the two coils are provided on the surfaces facing each other, but may be provided on adjacent surfaces or on the same surface.

4). Operation Flow of Power Transmission / Reception Device FIGS. 6 and 7 show an example of the operation flow of the power transmission / reception device of this embodiment. FIG. 6 shows an example of a flow from the standby state (initial state) to the branching to the power reception process or the power transmission process. FIG. 7 shows an example of a flow from branching to power reception processing or power transmission processing until power transmission / reception is started. The control processing of these operation flows is performed by the control unit of the power transmission / reception control device.

  With reference to FIG. 6, a flow from the standby state to branching to a power reception process or a power transmission process will be described.

  In the standby state (initial state), first, the control mode of the power transmission / reception unit is set to the power reception mode (S1). In the power reception mode, power transmission is not performed and a rectification operation is performed. Here, for example, when there is an instruction from the host or an instruction from an external switch, a power transmission request is made to the partner apparatus (S2, S3). For this power transmission request, an AC voltage is generated by controlling a plurality of transistors in the power transmission / reception unit, and a power transmission request signal is transmitted by performing frequency modulation, amplitude modulation, and the like. After transmitting the power transmission request, the process proceeds to power reception processing (S6).

  On the other hand, when a power transmission request is not sent to the counterpart device, it is determined whether there is a power transmission request from the counterpart device. When a coil electromotive force, that is, a voltage induced in the coil is detected (S4) and a power transmission request signal from the counterpart device is detected (S5), an external power source is connected (S9), or the battery voltage is It is determined whether the voltage is higher than the predetermined voltage (S10). When this condition is satisfied, the power transmission mode is set (S11), and the process proceeds to power transmission processing (S12).

  Even if the coil electromotive force is detected (S4), when the power transmission request signal from the counterpart device is not detected (S5), the process proceeds to the power receiving process (S6).

  Even when coil electromotive force is not detected, if there is a power transmission instruction from the external switch (S7) or a power transmission instruction from the host (S8), whether an external power supply is further connected (S9), or battery voltage Is higher than the predetermined voltage (S10), the power transmission mode is set (S11), and the process proceeds to power transmission processing (S12).

  If neither the external power supply connection (S9) nor the battery voltage (S10) is satisfied, a power transmission error is set (S13).

  As described above, according to the power transmission / reception device of the present embodiment, the power transmission / reception unit is set to the power reception mode in the standby state, and when a power transmission request from the counterpart device is detected, and a power transmission instruction from the host or external switch is issued. If there is, the power transmission mode is set. In this way, unnecessary power transmission can be avoided, and as a result, the power consumption of the electronic device can be kept low.

  Next, a flow from branching to power transmission processing or power reception processing until power transmission / reception is started will be described with reference to FIG. When branching to power transmission processing (S12), it is determined whether a predetermined time has not passed (S14). If the predetermined time has not elapsed, it is determined whether or not the counterpart device has landed, that is, whether or not the counterpart device has been set at a predetermined position where power can be transmitted (S15). Here, if the landing of the counterpart device is detected, authenticated power transmission is started (S16).

  When branching to power reception processing (S6), ID transmission is performed upon receiving authenticated power transmission on the power transmission side (S22). Here, negotiation processing for contactless power transmission is performed between the power transmission side and the power reception side.

  In this negotiation process, whether or not information can be communicated between the power transmission side and the power reception side, whether or not the communicated information is valid, and whether or not the load state on the power reception side is appropriate Confirmation process is performed. That is, whether or not the information has been properly received from the power receiving side, whether or not the information received from the power receiving side is assumed appropriate information, and the power receiving side is not a foreign object but an appropriate power receiving device (load). Whether or not it exists is confirmed in this negotiation process. It should be noted that the confirmation process of whether or not the load state on the power receiving side is appropriate may not be performed in the negotiation process.

  Specifically, in the negotiation process, standard information, coil information, and system information indicating a load state detection method are collated between the power transmission side and the power reception side. That is, the standard / coil / system information received from the power receiving side is collated with the standard / coil / system information on the power transmission side to check whether the standard / coil / system is compatible (matched).

  As described above, the negotiation process according to the present embodiment includes a confirmation process as to whether or not information communication is possible between the power transmission side and the power reception side, a confirmation process as to whether or not the communicated information is valid, and a load state on the power reception side. Checking whether or not it is appropriate, verification processing of standard information or coil information between the power transmission side and power reception side, and verification processing of system information on the power transmission side and system information on the power reception side indicating the load state detection method, etc. One.

  As a result of the negotiation process, when ID authentication is performed on both the power transmission side and the power reception side (S17, S23), the power reception side transmits information on the power transmission condition (S24). Here, a setup process for setting transmission conditions for contactless power transmission is performed between the power transmission side and the power reception side.

  In this setup process, when the power receiving side transmits transmission condition information for contactless power transmission, the power transmission side receives the transmission condition information and sets the transmission conditions for contactless power transmission. That is, when the power receiving side transmits transmission condition information necessary for normal power transmission such as the coil driving voltage and driving frequency, the power transmitting side sets transmission conditions such as the driving voltage and driving frequency based on the transmission condition information. In addition, setup information that is different for each device or application is exchanged between the power transmission side and the power reception side.

  As described above, the setup process in the present embodiment is at least one of a process for setting power transmission conditions based on the result of the negotiation process, and a process for exchanging information about the corresponding function between the power transmission side and the power reception side. It is.

  In the above setup process, when it is determined that the power transmission condition is satisfied (S18, S25), the power transmission side sets the power transmission condition (S19), the power reception side sets the power reception condition (S27), Power transmission and power reception are started (S20, S27). Here, contactless power transmission command processing is performed between the power transmission side and the power reception side. In other words, basic commands and commands that can be handled by the setup process are issued and executed.

  On the other hand, when the ID authentication is not performed (S17, S23) or when the power transmission condition is not satisfied (S18, S25), the power transmission side stops the authenticated power transmission (S21), and the power receiving side waits for the timer (S28). Return to the standby state.

  In the command process, after the setup process, various commands such as a normal power transmission start command, a battery full charge detection command (full charge notification command), and a battery recharge confirmation command are performed. That is, these commands are issued and executed. It is sufficient that at least a normal power transmission start command is prepared as a command, and other commands can be handled as optional commands.

  The command processing in the present embodiment is processing for performing at least one of command issuance and command execution that has been confirmed to be compatible by at least one of negotiation processing and setup processing.

  The command is at least one of a command for starting normal power transmission, a command for detecting the full charge of the battery of the load, a command for confirming whether or not the battery needs to be recharged, and the like.

  As described above, according to the power transmission / reception device of the present embodiment, one electronic device can function as both the power transmission side and the power reception side. In addition, since the negotiation process and the setup process can be performed between the power transmission side and the power reception side, power transmission / reception by contactless power transmission can be performed safely and efficiently.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Therefore, all such modifications are included in the scope of the present invention. For example, in the specification or the drawings, terms (VDD, VSS, etc.) described at least once together with different terms having a broader meaning or the same meaning (first power supply node, second power supply node, etc.) It can be replaced by the different terms at any point. Further, the configurations and operations of the power transmission / reception control device, the power transmission / reception device, and the electronic device are not limited to those described in this embodiment, and various modifications can be made.

100, 200 Power transmission / reception device, 110, 210 Power transmission / reception unit,
120, 220 Power transmission / reception control device, 130, 230 control unit, 140, 240 detection unit, 300, 400 Electronic device, 310, 410 Charge / discharge control device,
320, 420 Battery, 330, 430 External power supply terminal,
340, 440 host, 301 AC adapter, 401 display unit, 402 operation unit,
L1, L2 coil, CN1, CN2 control signal, RQ1, RQ2 power transmission request signal,
SA1, SB1, SA2, SB2 switch,
ST1, SR1, ST2, SR2 External switch

Claims (10)

A power transmission / reception control device for contactless power transmission,
A control unit that controls a power transmission / reception unit that performs transmission and reception of the contactless power transmission; and
Including a detection unit,
The control unit sets a control mode of the power transmission / reception unit to a power reception mode in a standby state, and sets the control mode of the power transmission / reception unit to a power transmission mode when a power transmission request from the counterpart device is detected by the detection unit. A power transmission / reception control device characterized by setting. In claim 1,
The control unit sets the control mode of the power transmission / reception unit to the power transmission mode when the power transmission request is detected and connection of an external power source is detected or when the battery voltage is higher than a predetermined voltage. A power transmission / reception control device. In claim 2,
The control unit controls the power transmission / reception unit when power transmission is instructed by switching of a host or an external switch and connection of the external power source is detected or when the battery voltage is higher than the predetermined voltage. A power transmission / reception control device, wherein the mode is set to the power transmission mode. In any one of Claims 1 thru | or 3,
The power transmission / reception unit
A first transistor provided between the first power supply node and the first node on one end side of the contactless power transmission coil;
A second transistor provided between the first node and a second power supply node;
A third transistor provided between the first power supply node and a second node on the other end side of the contactless power transmission coil;
A fourth transistor provided between the second node and the second power supply node;
Capacitors are provided between at least one of the first coil end node and the first node and between the second coil end node and the second node,
In the standby state, the control unit turns off the first transistor to the fourth transistor, and rectifies the power reception mode by a body diode of each of the first transistor to the fourth transistor. A power transmission / reception control device characterized by performing an operation. In claim 4,
The controller is
An operation of turning on the first transistor and the fourth transistor and turning off the second transistor and the third transistor;
An operation of turning off the first transistor and the fourth transistor and turning on the second transistor and the third transistor;
A power transmission / reception control device that performs power transmission control in the power transmission mode by alternately repeating operations. In any one of Claims 1 thru | or 5,
When the power transmission / reception unit is set to a power transmission / reception mode in which power transmission and power reception are performed simultaneously,
The power transmission / reception control device, wherein the control unit performs control to transmit the power received by the power transmission / reception unit from the first counterpart device to the second counterpart device. A power transmission / reception control device for contactless power transmission,
A control unit that controls a power transmission / reception unit that performs transmission and reception of the contactless power transmission; and
Including a detection unit,
The controller is
In the standby state, set the control mode of the power transmission / reception unit to the power reception mode,
When the power transmission is instructed by switching of the host or the external switch and the connection of the external power source is detected or the battery voltage is higher than the predetermined voltage, the control mode of the power transmission / reception unit is set to the power transmission mode. A power transmission / reception control device. A power transmission / reception control device according to any one of claims 1 to 7,
A power transmission / reception device including the power transmission / reception unit.   The electronic device containing the power transmission / reception apparatus of Claim 8. A non-contact power transmission control method,
In the standby state, set the power transmission / reception unit control mode to power reception mode,
When the detection unit detects a power transmission request from the counterpart device, the control mode of the power transmission / reception unit is set to a power transmission mode and power is supplied to the counterpart device by the contactless power transmission Method.

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