JP6737088B2 - Power supply device - Google Patents

Description

The present invention relates to a power feeding device, and particularly to a power feeding device including a communication unit.

BACKGROUND ART Conventionally, a power supply device including a communication unit is known (for example, refer to Patent Document 1).

The above Patent Document 1 discloses a wireless power device including a communication channel. The wireless power device is provided with a communication channel and a transmitter coil. And it is comprised so that electric power may be supplied from a transmitting coil to a receiving coil of a plurality of receivers. In addition, the communication channel is configured to be capable of wireless communication with each of the plurality of receivers. The communication channel is then configured to convey to the plurality of receivers a signal requesting that the load resistance be modified. The receiver is then configured to modify the load resistance based on the signal requesting to modify the load resistance. As a result, this wireless power device makes it possible to supply power from the transmitter coil to the receiver coils of multiple receivers while controlling the power distribution for each receiver by modifying the load resistance of the receiver. It is configured.

JP, 2014-54182, A

Here, in general, the number of communication channels has an upper limit in terms of standards or specifications. That is, there is an upper limit to the number (number) of communication channels that can be simultaneously connected. For example, in the Bluetooth (registered trademark) standard, the upper limit may be up to 8 units, and depending on the specifications, the upper limit may be less than 8 units (such as 3 units). Therefore, in the wireless power device of Patent Document 1, when power is supplied to the number of receivers exceeding the number of communication channels, the number of receivers exceeding the number of communication channels is required to correct the load resistance. It is considered that the electric power is supplied without transmitting the signal.

In this case, when the load resistance of the receiver to which the signal requesting the correction of the load resistance is not transmitted is relatively small, it is considered that the power receiving voltage value becomes large because the load resistance is small. On the other hand, when the load resistance of the receiver to which the signal requesting the correction of the load resistance is not transmitted is relatively large, it is considered that the received voltage value becomes smaller as the load resistance increases. As a result, it is considered that the received voltage value may be outside the range of the voltage that can be received by the receiver. Therefore, in the wireless power device of Patent Document 1, when power is supplied to the number of receivers (power receiving devices) that exceeds the number of communication channels (communication units) that can be simultaneously connected, the power is appropriately supplied. There is a problem that it is difficult to supply.

The present invention has been made to solve the above problems, and an object of the present invention is to supply power to a number of power receiving devices that exceeds the number of communication units that can be simultaneously connected. Even in the case, it is to provide a power supply device capable of supplying power appropriately.

In the power supply device according to the first aspect of the present invention, a power supply unit, a power supply coil that supplies electric power supplied from the power supply unit to a plurality of power reception devices, and a predetermined number of power reception devices are communicatively connectable. The communication unit includes a determination unit that determines whether or not the change over time in the information about power feeding of the power feeding coil and the change pattern over time in the information about power feeding are similar to each other. It is configured to control so as to preferentially disconnect the communication connection with the power receiving device that is determined to be present.

In the power supply device according to the first aspect of the present invention, since the information regarding the power supply of the power supply coil is determined to be approximate by the determination unit, the change in the information regarding the power supply over time can be predicted, and thus the prediction is possible. As a result, it is possible to disconnect the connection with the power receiving device that does not need the communication connection, and preferentially connect the power receiving device that needs the communication connection. Then, even when power is supplied to the number of power receiving devices that the communication unit can connect to at the same time, power can be appropriately supplied by predicting a change in information regarding power supply over time.

In the power supply device according to the first aspect, preferably, when there is a communication connection request from the power receiving devices exceeding the number of communication units that can simultaneously perform communication connection, the determination unit determines that the power supply devices are close to each other. Preferentially disconnects from the power receiving device. With this configuration, the connection with the power receiving device that is determined to be similar by the determining unit is preferentially disconnected, so that the number of power receiving devices with which the communication unit is connected can communicate with the communication unit. It is possible to prevent the power receiving devices from exceeding a predetermined number.

In the power supply device according to the first aspect, preferably, the communication unit is configured to acquire the power reception information from the power reception device that is communicatively connected, and the information related to the power supply includes the power reception information of the power reception device. The unit, acquired by the communication unit, the change over time of the power reception information of the power receiving device, and the change pattern over time of the power reception information of the power receiving device determines whether or not it is approximate, It is configured to control so as to preferentially disconnect the connection with the power receiving device determined to be present. According to this structure, if the change over time in the power reception information of the power receiving device and the change pattern over time in the power reception information of the power receiving device are similar, the change over time in the power reception information of the power receiving device is predicted. Therefore, by disconnecting the predictable connection with the power receiving device, it is possible to prevent the number of power receiving devices with which the communication unit is communicatively connected from exceeding a predetermined number of power receiving devices with which the communication unit is communicatively connectable. , Power can be appropriately supplied to all power receiving devices. In addition, since the power reception information of the power reception device is directly confirmed to determine the power reception device as the disconnection candidate, it is possible to supply power more safely.

In this case, preferably, the change over time in the power receiving information of the power receiving device includes the change over time in the received power of the power receiving device, and the change pattern of the power receiving information in the power receiving device over time is the required power of the power receiving device. Including a change pattern over time, the determination unit determines whether the change over time in the received power of the power receiving device and the change pattern over time in the required power of the power receiving device acquired by the communication unit are similar. It is configured to determine whether or not the power receiving device is determined to be close and to preferentially disconnect the connection with the power receiving device. With this configuration, if the change in the received power of the power receiving device over time and the change pattern of the required power of the power receiving device over time are similar, the change in the received power of the power receiving device over time is predicted. Therefore, by disconnecting the predictable connection with the power receiving device, it is possible to prevent the number of power receiving devices with which the communication unit is communicatively connected from exceeding a predetermined number of power receiving devices with which the communication unit is communicatively connectable. , Power can be appropriately supplied to all power receiving devices. In addition, since the power received by the power receiving device is directly checked to determine the power receiving device as a disconnection candidate, the power can be supplied more safely.

In the power supply device that determines the change in the received power and the change pattern of the required power in an approximate manner, preferably, the change pattern of the required power of the power receiving device over time decreases for a certain period of time after the required power continues to increase for a certain period of time. The determination unit makes an approximation when the change in the received power over time and the change pattern in which the required power continues to increase for a certain period and then decreases for a certain period of time substantially match. To determine. According to this structure, it is determined whether or not the power receiving device has a battery that has been charged in a stable state for a certain period of time or more by cccv (constant current/constant voltage charging) control, and it is determined that they are close to each other. In this case, a change in the received power of the power receiving device over time can be predicted, so that power can be appropriately supplied even when the predictable power receiving device is disconnected.

In the power supply device for determining the change of the received power and the change pattern of the required power in an approximate manner, preferably, the change pattern of the required power of the power receiving device over time includes a change pattern in which the required power does not change for a certain period of time or more. When the change in the received power over time and the change pattern in which the required power does not change for a certain time or more substantially match, the unit determines that they are approximate. With this configuration, it is determined whether or not the power receiving device is a power receiving device without a battery, and if it is determined that the power receiving device is close to the power receiving device, it is possible that the received power of the power receiving device does not change over time. Since it can be predicted, power can be stably supplied even when the connection with the predictable power receiving device is disconnected.

In the power supply device to determine the change pattern of the received power and the change pattern of the required power, preferably, the change pattern of the required power of the power receiving device over time includes a change pattern in which the required power continues to decrease for a certain time or more, The determination unit determines that the received power is approximate to each other when the change over time in the received power and the change pattern in which the required power continues to decrease for a certain time or more substantially match. According to this structure, when it is determined that the power receiving devices are close to each other, it is possible to predict the change in the received power of the power receiving device over time. Power can be supplied. Further, since it is possible to determine that it is not necessary to supply the electric power after the required electric power becomes zero, it is possible to suppress the unnecessary electric power supply.

In the power supply device that approximately determines the change in the power reception information and the change pattern of the power reception information, preferably, the power reception information includes the remaining capacity of the secondary battery of the power reception apparatus, and the time of the remaining capacity of the secondary battery of the power reception apparatus. The change pattern over time includes a change pattern in which the remaining capacity of the secondary battery is saturated after a lapse of a certain time, and the determination unit determines that the change of the remaining capacity of the secondary battery over time and the remaining capacity of the secondary battery for a certain time. When the change pattern that saturates after a lapse of time substantially matches, it is determined that they are approximate. According to this structure, when it is determined that the power receiving devices are close to each other, the change in the remaining capacity of the secondary battery of the power receiving device over time can be predicted. Can also supply power appropriately. In addition, the remaining capacity of the secondary battery of the power receiving device is directly checked to determine the power receiving device as a disconnection candidate, so that power can be supplied more accurately. Further, after the remaining capacity of the secondary battery is saturated, it can be determined that it is not necessary to supply electric power, so that it is possible to suppress unnecessary electric power supply.

In the power supply device according to the first aspect, preferably, the information regarding power supply includes output information of the power supply unit, and the determination unit changes the output information of the power supply unit with time and the output information of the power supply unit with time. It is configured to determine whether or not the change pattern in (1) is close to each other, and control to preferentially disconnect the connection with the power receiving device that is determined to be close. According to this structure, if the change in the output information of the power supply unit over time is similar to the change pattern of the output information of the power supply unit over time, the change in the output information of the power supply unit over time is predicted. Therefore, by disconnecting the predictable connection with the power receiving device, it is possible to prevent the number of power receiving devices with which the communication unit is communicatively connected from exceeding a predetermined number of power receiving devices with which the communication unit is communicatively connectable. , Power can be appropriately supplied to all power receiving devices. In addition, since the output information of the power supply unit is directly confirmed to determine the power receiving device as a disconnection candidate, it is not necessary to acquire the power receiving information of the power receiving device, and the operation can be simplified.

In this case, preferably, the output information of the power supply unit includes the output power of the power supply unit, and the determination unit determines whether the change in the output power of the power supply unit over time and the change pattern of the output power of the power supply unit over time. It is configured to determine whether or not they are close to each other, and control to preferentially disconnect the connection with the power receiving device that is determined to be close to each other. According to this structure, if the change in the output power of the power supply unit over time and the change pattern of the output power of the power supply unit over time are similar, the change in output power of the power supply unit over time is predicted. Therefore, by disconnecting the predictable connection with the power receiving device, it is possible to prevent the number of power receiving devices with which the communication unit is communicatively connected from exceeding a predetermined number of power receiving devices with which the communication unit is communicatively connectable. , Can be properly powered. Further, since the output power of the power supply unit is directly checked to determine the power receiving device as a disconnection candidate, it is not necessary to acquire information such as the received power of the power receiving device, and the operation can be simplified. Moreover, since the determination is made from the electric power in the power feeding device, it is possible to make an accurate electric power determination without being affected by the outside during communication or the like.

In the power supply device that approximately determines the change of the output power and the change pattern of the output power, the change pattern of the output power over time includes a change pattern in which the output power continues to increase for a certain time and then decreases for a certain time. The determination unit determines that they are approximate when the change in the output power over time and the change pattern in which the output power continues to increase for a fixed time and then decreases for a fixed time substantially match. According to this structure, whether or not the power receiving device is a power receiving device having a battery that has been charged in a stable state for a certain period of time or more by cccv control, and if they are approximate, the output of the power supply unit is output. Since it is possible to predict a change in power over time, it is possible to appropriately supply power even when the predictable power receiving device is disconnected.

According to the present invention, as described above, electric power can be appropriately supplied even when the number of communication units that can be simultaneously connected is exceeded.

It is a block diagram showing the whole electric power feeder composition by a 1st, 4th, and 5th embodiment of the present invention. 6 is a graph showing a time change pattern of required power of the power receiving device and output power of the power feeding device according to the first and second embodiments of the present invention. 6 is a flowchart illustrating a process of selecting a power receiving device that disconnects a communication connection according to the first embodiment of the present invention. It is the block diagram which showed the entire structure of the electric power feeder by 2nd Embodiment of this invention. 9 is a flowchart illustrating a process of selecting a power receiving device that disconnects a communication connection according to the second embodiment of the present invention. It is the block diagram which showed the whole structure of the electric power feeder by 3rd Embodiment of this invention. It is a graph showing a time change pattern of the required power of the power receiving device according to the third embodiment of the present invention. 9 is a flowchart illustrating a process of selecting a power receiving device that disconnects a communication connection according to the third and fourth embodiments of the present invention. It is a graph showing the time change pattern of the required power of the power receiving device according to the fourth embodiment of the present invention. 19 is a graph showing a time change pattern of the remaining capacity of the secondary battery of the power receiving device according to the fifth embodiment of the present invention. It is a flowchart for demonstrating the selection process of the power receiving apparatus which cut|disconnects a communication connection by 5th Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment]
The configuration of the power supply apparatus 100 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3. As illustrated in FIG. 1, the power supply apparatus 100 according to the first embodiment is configured such that the power supply apparatus 100 and the power reception apparatus 200 are simultaneously provided to a plurality of power reception apparatuses 200 (for example, smartphones) arranged near the power supply apparatus 100. It is configured to supply electric power (as a non-contact power feeding device or a non-contact power feeding device) by using a magnetic resonance method without providing wiring, contacts, or the like therebetween.

(Overall structure of power supply device)
As shown in FIG. 1, the power supply device 100 includes a power supply unit 1, a power supply control unit 2, a communication destination selection unit 3, a storage unit 4, a time measurement unit 5, a determination unit 6, and a communication unit 7. And a feeding coil 8 are provided.

(Structure of each part of power supply device)
The power feeding coil 8 is configured to feed the power supplied from the power supply unit 1 to the power receiving device 200. The communication unit 7 is configured to be communicatively connectable to a predetermined number of power receiving devices 200. Then, the communication unit 7 is configured to acquire the unique information indicating the address of the power receiving device 200 and the received power of the power receiving device 200 selected by the communication destination selecting unit 3. The time measuring unit 5 is configured to measure the elapsed time from the start of power supply. The storage unit 4 is configured to store the change in the elapsed time of the received power from the selected power receiving device 200 and the previously predicted change pattern of the required power of the power receiving device 200 in the elapsed time. The determination unit 6 is configured to determine whether or not the change in the elapsed time of the received power and the predicted change pattern of the required power in the elapsed time substantially match. In the specification of the present application, “communication connection” is described as meaning that information regarding power reception can be simultaneously transmitted and received.

In the storage unit 4, a plurality of change patterns (for example, 10 or more) are stored in advance as change patterns of the required power over time. For example, as shown in FIG. 2, the storage unit 4 uses the following equations (1) and (1a) as equations that represent a change pattern in which electric power continues to increase for a fixed time (for example, 1 hour) due to constant current charging. (1b) and equation (1c) are saved. Further, the storage unit 4 stores the equations (2) and (2a) as the equations representing the change pattern that has been reduced by the constant voltage charging for a certain time (for example, 0.5 hours). Further, in FIG. 2, the time for switching from constant current charging to constant voltage charging is Tymax, and the required power at that time is ymax. Further, a, b, c, d, e, f, g, h, i are arbitrary constants (for example, 1).

Here, in the first embodiment, when there is a communication connection request from the power receiving devices 200 that exceeds the number of communication units 7 that can simultaneously make communication connections, the determination unit 6 determines that the two are similar. It is configured to preferentially disconnect the connection with the power receiving device 200. Specifically, first, a change in received power from the selected power receiving apparatus 200 over time is plotted to obtain a measured change pattern (plot result) of the received power. Here, in order to ensure accuracy, the number of plots should be as large as possible. For example, 100 pieces are plotted in the elapsed time of the received power of the power receiving device 200. The 100 plots here are merely examples, and those skilled in the art can increase or decrease the number of plots according to actual needs.

Then, as one example, when the following conditions are satisfied, it is considered that the acquired change pattern (measured change pattern) is close to the change pattern (predicted change pattern) stored in advance by the power supply apparatus 100. First, the number of information pieces of change patterns and the number of plots are a certain number or more, for example, the number of plots is 100 or more (may be more than this). The measured value of each plot result is within a certain range from the predicted value of the predicted change pattern, for example, within ±5%. In general, as an example, the absolute value of the surveyed value is used. Furthermore, it is determined that the actually-measured change pattern and the predicted change pattern substantially match each other, and the prediction result is predicted when a certain proportion or more, for example, 90% or more, of each plot result and the predicted change pattern substantially match. It is determined that it is close to the change pattern.

Further, when the number of communication connectable units (for example, 3 units) is communicatively connected and a communication is further requested from the new power receiving device 200, the determination unit 6 approximates the unit from among the three units. The connection with the power receiving device 200 that is determined to be disconnected is disconnected, and the connection with the new power receiving device 200 is prioritized. One of the criteria for determining priority disconnection is the speed at which the required power of the power receiving device 200 is reduced. For example, among the three communication disconnection candidates, when the required power [W] decreases with respect to the time change as in the formula (2) of the first embodiment shown in FIG. 2, the required power [W] is constant. The power receiving device having the earliest time T below the value may be preferentially disconnected. Here, as an example, this constant value may be 1 W or 0 W. This value may be appropriately adjusted depending on the characteristics of the power receiving device 200, the actual necessity of charging, and the like.

(Selection of power receiving device that disconnects communication connection)
Next, with reference to FIG. 3, selection of the power receiving device 200 for disconnecting the communication connection by the power feeding device 100 of the first embodiment will be described.

First, in step S1, power feeding to the power feeding coil 8 (see FIG. 1) is started.

In step S2, the measurement of the elapsed time from the start of power feeding is started.

In step S3, unique information such as an address is acquired from the power receiving device 200.

In step S4, the received power is acquired from the power receiving device 200.

In step S5, the received power result obtained in step S4 is stored in the storage unit 4 and plotted for each elapsed time.

In step S6, it is determined whether the plot result obtained in step S5 has increased for a certain period of time and then decreased for a certain period of time. When it corresponds, it progresses to step S7, and when it does not correspond, it returns to step S4.

In step S7, it is determined whether the plot results from the elapsed time 0 to Tymax substantially match the predicted change pattern of the required power stored in the storage unit 4 in advance. If they substantially match, the process proceeds to step S8, and if they do not substantially match, the process proceeds to step S10.

In step S8, it is determined whether or not the plot results after the elapsed time Tymax substantially match the predicted change pattern of the required power stored in the storage unit 4 in advance. If they substantially match, the process proceeds to step S9, and if they do not substantially match, the process proceeds to step S10.

In step S9, the corresponding power receiving device 200 is set as a communication disconnection candidate.

In step S10, the corresponding power receiving device 200 is not set as a communication disconnection candidate.

In step S11, it is determined whether or not there is one communication disconnection candidate. If there are two or more communication disconnection candidates, the process proceeds to step S12.

In step S12, the maximum operating voltage of each power receiving device 200 that is a candidate for communication disconnection is acquired.

In step S13, the difference between the maximum operating voltage of each power receiving device 200 and the power receiving voltage acquired in step S12 is the largest in order to suppress the destruction of the power receiving device 200 due to the power receiving voltage exceeding the maximum operating voltage. The power receiving device 200 is set as a communication disconnection candidate.

In addition, as a modification of steps S12 to S13, in order to prevent the power receiving device 200 from being charged due to the power receiving voltage falling below the minimum operating voltage, the minimum operating voltage of each power receiving device 200 of the communication disconnection candidate is set. The power receiving device 200 that has acquired the largest difference between the minimum operating voltage and the power receiving voltage is set as the communication disconnection candidate.

In addition to selecting the communication disconnection candidate and suppressing the destruction of the power receiving device 200 as described above, the power receiving device 200 that has been disconnected in the communication may take other protective measures. For example, a protection function (such as a power management circuit (PMU)) that some of the power receiving devices 200 already have may receive power equal to or higher than the maximum operating power at the charging process, start charging, or disconnect charging, or receive overvoltage. Can be protected from doing. The power management circuit of such a power receiving device (for example, a mobile phone or other general electronic device) receives an external command to enable the protection function. For a power receiving apparatus that already has a protection function and that uses the command from the outside to enable the above-described protection function, the power feeding apparatus 100 sets these power receiving apparatuses 200 as disconnection candidates and disconnects communication with these power receiving apparatuses 200. When disconnecting, the protection function can be enabled by transmitting a command from the outside to these power receiving devices 200 before disconnection.

The protection function of the power receiving device 200 has, for example, a switch structure that can selectively switch between physically short-circuiting and opening the receiving unit (power receiving coil) and the control unit. The device 200 can be protected from being destroyed. In addition, the power receiving device has a structure in which the constants of the elements (capacitors and inductors) in the resonance circuit can be adjusted, and the constants of the elements are adjusted by, for example, selectively switching the variable capacitors by connecting a plurality of capacitors. It is possible to adjust the resonance frequency of the battery, and thus to adjust the charging function and obtain the effect of slowly separating from the charging.

(Effects of the first embodiment)
In the first embodiment, the following effects can be obtained.

In the first embodiment, as described above, the determination unit 6 makes an approximate determination of the change over time in the information regarding the power feeding of the power feeding coil 8 and the change pattern over time in the information regarding the power feeding of the power feeding coil 8. To configure. As a result, it is possible to predict the change in the information regarding the power supply over time by determining that the information regarding the power supply of the power feeding coil 8 is approximate by the determination unit 6, and the communication connection can be established by the prediction. It is possible to disconnect the unnecessary power receiving device 200 and preferentially connect the power receiving device 200 that requires communication connection. Then, even when power is supplied to the power receiving devices 200 in a number exceeding the number that the communication unit 7 can simultaneously connect, the power can be appropriately supplied.

Further, in the first embodiment, as described above, when there is a communication connection request from the power receiving devices 200 that exceed the number of communication units 7 that can simultaneously perform communication connection, the determination unit 6 approximates. It is configured to preferentially disconnect the connection with the power receiving device 200 determined to be. As a result, the connection with the power receiving device 200 that is determined to be similar by the determining unit 6 is preferentially disconnected, so that the number of power receiving devices 200 that the communication unit is communicatively connectable is that the communication unit 7 is communicatively connectable. It is possible to prevent the power receiving devices 200 from exceeding a predetermined number.

Further, in the first embodiment, as described above, the determination unit 6 is configured to change the received power (power reception information) of the power receiving device 200 acquired by the communication unit 7 over time and the required power of the power receiving device 200 (power reception). It is configured to determine whether or not the change pattern of (information) over time is close to each other, and control to preferentially disconnect the connection with the power receiving device 200 that is determined to be close. .. Accordingly, if the change in the received power of the power receiving apparatus 200 over time is similar to the change pattern of the required power of the power receiving apparatus 200 over time, the change in the received power of the power receiving apparatus 200 over time can be predicted. Therefore, by disconnecting the predictable power receiving device 200, the number of power receiving devices 200 to which the communication unit 7 is communicatively connected may exceed the predetermined number of power receiving devices 200 to which the communication unit 7 is communicatively connectable. In addition to being suppressed, power can be appropriately supplied to all the power receiving devices 200. Moreover, since the power receiving device 200 to be a disconnection candidate is determined by directly checking the power received by the power receiving device 200, the power can be supplied more safely.

In addition, in the first embodiment, as described above, in the determination unit 6, the change in the received power over time and the change pattern in which the required power continues to increase for a certain time and then decreases for the certain time substantially match. At this time, it is configured to determine that they are close. This determines whether or not the power receiving device 200 has a battery that has been charged in a stable state for a certain period of time or more by the cccv control, and if it is determined that they are close to each other, the received power of the power receiving device 200 Since the change over time can be predicted, power can be appropriately supplied even when the predictable connection with the power receiving device 200 is disconnected.

[Second Embodiment]
Next, with reference to FIGS. 2, 4, and 5, the configuration of the power feeding apparatus 300 according to the second embodiment of the present invention will be described. In the second embodiment, in addition to the configuration of the first embodiment, a power measurement unit 9 that measures the output power of the power supply unit 1 is provided. The same components as those in the first embodiment are designated by the same reference numerals as those in the first embodiment and shown in the drawing, and the description thereof is omitted.

(Overall structure of power supply device)
As illustrated in FIG. 4, the power supply device 300 includes a power supply unit 1, a power supply control unit 2, a communication destination selection unit 3, a storage unit 41, a time measurement unit 5, a determination unit 61, a communication unit 71, A power feeding coil 8 and a power measuring unit 9 are provided.

(Structure of each part of power supply device)
The communication unit 71 is configured to acquire unique information indicating the address and the like of the power receiving device 200. The power measuring unit 9 is configured to measure the output power of the power supply unit 1. The storage unit 41 stores the change in the output power of the power supply unit 1 over time (actually measured change pattern) and the previously predicted change pattern of the output power of the power supply unit 1 over time (predicted change pattern). Is configured. The determination unit 61 is configured to determine whether or not a change in output power over time and a previously predicted change pattern of output power over time substantially match. In addition, the description of the first embodiment can be referred to for determining whether or not to approximate.

(Selection of power receiving device that disconnects communication connection)
Next, with reference to FIG. 5, selection of the power receiving device 200 that disconnects the communication connection by the power feeding device 300 of the second embodiment will be described. Further, as in the first embodiment, the power demand of the power receiving device 200 is reduced as one criterion for determining the priority disconnection. For example, among the three communication disconnection candidates, when the required power [W] decreases with respect to the time change like the formula (2a) of the second embodiment shown in FIG. 2, the required power [W] is constant. The power receiving device having the earliest time T that is less than or equal to the value of may be preferentially disconnected. Here, as an example, this constant value may be 1 W or 0 W. This value may be appropriately adjusted depending on the characteristics of the power receiving device 200, the actual necessity of charging, and the like.

First, in step S21, power feeding to the power feeding coil 8 (see FIG. 4) is started.

In step S22, measurement of the elapsed time from the start of power supply is started.

In step S23, the unique information such as the address is acquired from the power receiving device 200.

In step S24, the output power of the power supply unit 1 is measured.

In step S25, the output power result acquired in step S24 is stored in the storage unit 41 and plotted for each elapsed time.

In step S26, it is determined whether the plot result obtained in step S25 has increased for a certain period of time and then decreased for a certain period of time. When it corresponds, it progresses to step S27, and when it does not correspond, it returns to step S24.

In step S27, it is determined whether or not the plot result from the elapsed time 0 to Tymax (see FIG. 3) substantially matches the predicted change pattern of the output power stored in the storage unit 41 in advance. If they substantially match, the process proceeds to step S28, and if they do not substantially match, the process proceeds to step S30.

In step S28, it is determined whether or not the plot result after the elapsed time Tymax substantially matches the predicted change pattern of the output power stored in the storage unit 41 in advance. When they substantially match, the process proceeds to step S29, and when they do not substantially match, the process proceeds to step S30.

In step S29, the corresponding power receiving device 200 is set as a communication disconnection candidate.

In step S30, the corresponding power receiving device 200 is not set as a communication disconnection candidate.

In step S31, it is determined whether or not there is one communication disconnection candidate. If there are two or more communication disconnection candidates, the process proceeds to step S32.

In step S32, the maximum operating voltage of each power receiving device 200 that is a candidate for communication disconnection is acquired.

In step S33, the power receiving device 200 having the largest difference between the maximum operating voltage and the power receiving voltage of each power receiving device 200 acquired in step S32 is set as the communication disconnection candidate.

In addition, as a modified example of steps S32 to S33, in order to suppress that the power receiving device 200 is not charged due to the power receiving voltage being lower than the minimum operating voltage, the minimum operating voltage of each power receiving device 200 of the communication disconnection candidate is set. The power receiving device 200 that has acquired the largest difference between the minimum operating voltage and the power receiving voltage is set as the communication disconnection candidate.

(Effects of Second Embodiment)
In the second embodiment, the following effects can be obtained.

In the second embodiment, as described above, the determination unit 61 makes the change in the output power (output information) of the power supply unit 1 over time and the change pattern of the output power of the power supply unit 1 over time approximate. It is configured to control whether or not the connection with the power receiving device 200 that is determined to be similar is preferentially disconnected. Accordingly, if the change in the output power of the power supply unit 1 over time is similar to the change pattern of the output power of the power supply unit 1 over time, the change in the output power of the power supply unit 1 over time can be predicted. Therefore, by disconnecting the predictable power receiving device 200, the number of power receiving devices 200 to which the communication unit 71 is communicatively connected may exceed a predetermined number of power receiving devices 200 to which the communication unit 71 is communicatively connectable. The power can be appropriately controlled while being suppressed. Further, the output power of the power supply unit 1 is directly checked to determine the power receiving device 200 to be a disconnection candidate, so that it is not necessary to acquire information such as the power receiving power of the power receiving device 200, and the operation can be simplified.

Further, in the second embodiment, as described above, in the determination unit 61, the change in output power over time and the change pattern in which the output power continues to increase for a certain time and then decreases for the certain time substantially match. At this time, it is configured to determine that they are close to each other. This determines whether or not the power receiving device 200 is a power receiving device 200 having a battery that has been charged in a stable state for a certain period of time or more by cccv control, and when the power receiving device 200 is approximate, the output power of the power supply unit 1 is determined. Since the change over time can be predicted, it is possible to appropriately supply power even when the predictable power receiving device 200 is disconnected.

The other effects of the second embodiment are similar to those of the first embodiment.

[Third Embodiment]
Next, with reference to FIGS. 6 and 7, the configuration of the power feeding apparatus 400 according to the third embodiment of the present invention will be described. In the third embodiment, unlike the above-described first embodiment, the change pattern of the required power of the power receiving device 500 over time is different from that of the power receiving device 500 (for example, LED lighting) that does not have a battery when the required power is equal to or longer than a certain time. It contains a change pattern that does not change. The same components as those in the first embodiment are designated by the same reference numerals as those in the first embodiment and shown in the drawing, and the description thereof is omitted.

(Overall structure of power supply device)
As illustrated in FIG. 6, the power supply device 400 includes a power supply unit 1, a power supply control unit 2, a communication destination selection unit 3, a storage unit 42, a time measurement unit 5, a determination unit 6, and a communication unit 7. The power feeding coil 8 is provided.

(Structure of each part of power supply device)
The storage unit 42 stores a plurality of change patterns as change patterns of the required power over time. For example, as shown in FIG. 7, the storage unit 42 stores the following expression (3) as a change pattern that does not change for a fixed time (for example, 1 hour) or more. Further, j is an arbitrary constant (for example, 1).

(Selection of power receiving device that disconnects communication connection)
Next, with reference to FIG. 8, selection of the power receiving device 500 that disconnects the communication connection by the power feeding device 400 of the third embodiment will be described. In addition, the description of the first embodiment can be referred to for determining whether or not to approximate. In the case where the communication disconnection candidates are all the power receiving devices 500 having the change pattern that does not change with time as in the third embodiment, the power receiving device having a longer elapsed time from the start of charging may be preferentially disconnected. ..

First, in step S41, power feeding to the power feeding coil 8 (see FIG. 6) is started.

In step S42, the measurement of the elapsed time from the start of power feeding is started.

In step S43, the unique information such as the address is acquired from the power receiving device 500.

In step S44, the received power is acquired from the power receiving device 500.

In step S45, the received power result obtained in step S44 is stored in the storage unit 42 and plotted for each elapsed time.

In step S46, it is determined whether or not a predetermined time or more has elapsed. If it has elapsed, the process proceeds to step S47, and if it has not elapsed, the process returns to step S44.

In step S47, it is determined whether or not the plot result obtained in step S45 substantially matches the predicted required power pattern previously stored in the storage unit 42. If they substantially match, the process proceeds to step S48. If they do not substantially match, the process proceeds to step S49.

In step S48, the corresponding power receiving device 500 is set as a communication disconnection candidate.

In step S49, the corresponding power receiving device 500 is not set as a communication disconnection candidate.

In step S50, it is determined whether or not there is one communication disconnection candidate. If there are two or more communication disconnection candidates, the process proceeds to step S51.

In step S51, the maximum operating voltage of each power receiving device 500 that is a candidate for communication disconnection is acquired.

In step S52, the power receiving device 500 having the largest difference between the maximum operating voltage and the power receiving voltage of each power receiving device 500 acquired in step S51 is set as a communication disconnection candidate.

In addition, as a modification of steps S51 to S52, in order to prevent the power receiving device 500 from being charged due to the power receiving voltage falling below the minimum operating voltage, the minimum operating voltage of each power receiving device 500 of the communication disconnection candidate is set. The power receiving device 500 that has acquired the largest difference between the minimum operating voltage and the power receiving voltage is set as the communication disconnection candidate.

(Effect of the third embodiment)
In the third embodiment, the following effects can be obtained.

In the third embodiment, as described above, the determination unit 6 determines that the received power is approximate when the change in the received power over time and the change pattern in which the required power does not change for a certain time or more substantially match. To configure. With this, it is determined whether or not the power receiving device 500 is the power receiving device 500 having no battery, and when it is determined that the power receiving device 500 and the power receiving device 500 are close to each other, it is predicted that the power received by the power receiving device 500 does not change over time. Therefore, even if the predictable connection with the power receiving device 500 is disconnected, the power can be stably supplied.

The other effects of the third embodiment are similar to those of the first embodiment.

[Fourth Embodiment]
Next, the configuration of the power supply apparatus 101 according to the fourth embodiment of the present invention will be described with reference to FIGS. 1, 8 and 9. In the fourth embodiment, unlike the first embodiment, the change pattern of the required power of the power receiving device 201 over time includes a change pattern in which the required power continues to decrease for a certain period of time or more. The same components as those in the first embodiment are designated by the same reference numerals as those in the first embodiment and shown in the drawing, and the description thereof is omitted.

(Overall structure of power supply device)
As illustrated in FIG. 1, the power supply apparatus 101 includes a power supply unit 1, a power supply control unit 2, a communication destination selection unit 3, a storage unit 43, a time measurement unit 5, a determination unit 6, and a communication unit 7. The power feeding coil 8 is provided.

(Structure of each part of power supply device)
The storage unit 43 stores a plurality of change patterns as change patterns of the required power over time. For example, as shown in FIG. 9, the storage unit 43 stores the following Expression (4) or Expression (5) as a change pattern that continues to decrease for a certain time (for example, one hour) or more. In addition, k, l, m, and n are arbitrary constants (for example, 1).

(Selection of power receiving device that disconnects communication connection)
The selection of the power receiving device 201 that disconnects the communication connection by the power feeding device 101 of the fourth embodiment is the same as the selection of the third embodiment shown in FIG. 8. Further, as in the first and second embodiments, the speed for reducing the required power of the power receiving device 201 is one of the criteria for determining the priority disconnection. For example, among the three communication disconnection candidates, when the required power [W] decreases with respect to the time change as in the equation (5) of the fourth embodiment shown in FIG. 9, the required power [W] is constant. The power receiving device having the earliest time T below the value may be preferentially disconnected. Here, as an example, this constant value may be 1 W or 0 W. This value may be appropriately adjusted depending on the characteristics of the power receiving device 201, the actual need for charging, and the like.

(Effects of Fourth Embodiment)
In the fourth embodiment, the following effects can be obtained.

In the fourth embodiment, as described above, the determination unit 6 determines that the received power is approximate when the change in the received power over time and the change pattern in which the required power continues to decrease for a certain period of time substantially match. To configure. As a result, when it is determined that they are close to each other, it is possible to predict a change in the received power of the power receiving apparatus 201 over time, and thus even if the predictable power receiving apparatus 201 is disconnected, the power is appropriately supplied. Can be supplied. Further, since it is possible to determine that it is not necessary to supply the electric power after the required electric power becomes zero, it is possible to suppress the unnecessary electric power supply.

The other effects of the fourth embodiment are similar to those of the first embodiment.

[Fifth Embodiment]
Next, the configuration of the power supply apparatus 102 according to the fifth embodiment of the present invention will be described with reference to FIGS. 1, 10 and 11. In the fifth embodiment, unlike the first embodiment, the determination unit 62 determines the change in the remaining capacity of the secondary battery of the power receiving device 202 over time and the change pattern of the remaining capacity of the secondary battery over time. It is configured to make an approximate determination. The same components as those in the first embodiment are designated by the same reference numerals as those in the first embodiment and shown in the drawing, and the description thereof is omitted.

(Overall structure of power supply device)
As illustrated in FIG. 1, the power supply device 102 includes a power supply unit 1, a power supply control unit 2, a communication destination selection unit 3, a storage unit 44, a time measurement unit 5, a determination unit 62, and a communication unit 7. , And the feeding coil 8 are provided.

(Structure of each part of power supply device)
The storage unit 44 stores a plurality of change patterns as the change patterns of the remaining capacity of the secondary battery over time. For example, as shown in FIG. 10, the storage unit 44 stores the following expression (6) as a change pattern that is saturated after a lapse of a fixed time (for example, 1 hour). The determination unit 62 determines whether or not the change in the remaining capacity of the secondary battery of the power receiving apparatus 202 over time and the change pattern of the remaining capacity of the secondary battery of the power receiving apparatus 202 over time substantially match. Is configured. Also, o and p are arbitrary constants (for example, 1).

(Selection of power receiving device that disconnects communication connection)
Next, with reference to FIG. 11, selection of the power receiving device 202 that disconnects the communication connection by the power feeding device 102 according to the fifth embodiment will be described. In addition, the description of the first embodiment is referred to for determining whether or not to approximate.

In addition, in the fifth embodiment, the communication disconnection candidate is determined based on the remaining capacity of the secondary battery of the power receiving device 202. In another embodiment, when all of the power receiving devices 202 that are candidates for communication disconnection satisfy the change pattern of Expression (6), the power supply apparatus 102 receives the secondary power of the power receiving device 202 from the power receiving device 202 that is the candidate for communication disconnection. Obtain the maximum capacity [Ah] of the battery. The power receiving device having the smallest difference between the maximum capacity and the current capacity may be preferentially disconnected.

Further, in another embodiment, the power supply apparatus 102 acquires the charging status (progress information) of the secondary battery of the power receiving apparatus 202 from the power receiving apparatus 202 that is a communication disconnection candidate. The power feeding apparatus 102 preferentially disconnects the power receiving apparatus closer to full charge (100%) based on the charging progress information acquired from the power receiving apparatus 202.

First, in step S61, power feeding to the power feeding coil 8 (see FIG. 1) is started.

In step S62, the measurement of the elapsed time from the start of power supply is started.

In step S63, unique information such as an address is acquired from the power receiving device 202.

In step S64, the remaining capacity of the secondary battery is acquired from the power receiving device 202.

In step S65, the residual capacity result of the secondary battery acquired in step S64 is stored in the storage unit 44 (see FIG. 1) and plotted for each elapsed time.

In step S66, it is determined whether or not a predetermined time or more has elapsed. If it has elapsed, the process proceeds to step S67, and if it has not elapsed, the process returns to step S64.

In step S67, it is determined whether the plot result obtained in step S65 substantially matches the predicted change pattern of the secondary battery remaining capacity stored in the storage unit 44 in advance. If they substantially match, the process proceeds to step S68, and if they do not substantially match, the process proceeds to step S69.

In step S68, the corresponding power receiving device 202 is set as a communication disconnection candidate.

In step S69, the corresponding power receiving device 202 is not set as a communication disconnection candidate.

In step S70, it is determined whether or not there is one communication disconnection candidate. When there are two or more communication disconnection candidates, the process proceeds to step S71.

In step S71, the maximum operating voltage of each power receiving device 202 that is a communication disconnection candidate is acquired.

In step S72, the power receiving device 202 having the largest difference between the maximum operating voltage and the power receiving voltage of each power receiving device 202 acquired in step S71 is set as the communication disconnection candidate.

In addition, as a modification of steps S71 to S72, in order to prevent the power receiving device 202 from being charged due to the power receiving voltage falling below the minimum operating voltage, the minimum operating voltage of each power receiving device 202 of the communication disconnection candidate is set. The power receiving device 202 that has acquired the largest difference between the minimum operating voltage and the power receiving voltage is set as the communication disconnection candidate.

(Effects of the fifth embodiment)
In the fifth embodiment, the following effects can be obtained.

In the fifth embodiment, as described above, when the determination unit 62 determines that the change in the remaining capacity of the secondary battery over time and the change pattern in which the remaining capacity of the secondary battery saturates after a certain period of time substantially match. Are configured to be determined to be close to each other. As a result, when it is determined that they are close to each other, it is possible to predict the change in the remaining capacity of the secondary battery of the power receiving device 202 over time. Therefore, even when the predictable connection with the power receiving device 202 is disconnected, Power can be supplied appropriately. In addition, the remaining capacity of the secondary battery of the power receiving device 202 is directly checked to determine the power receiving device 202 that is a disconnection candidate, so that power can be supplied more accurately. Further, after the remaining capacity of the secondary battery is saturated, it can be determined that it is not necessary to supply electric power, so that it is possible to suppress unnecessary electric power supply.

The other effects of the fifth embodiment are similar to those of the first embodiment.

[Modification]
It should be understood that the embodiments disclosed this time are exemplifications in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and further includes meanings equivalent to the scope of the claims and all modifications (modifications) within the scope.

For example, in the above-described first, second, fourth, and fifth embodiments, an example in which a smartphone is used as the power receiving device has been shown, but the present invention is not limited to this. For example, a PC, a tablet, a digital camera, or the like may be used as the power receiving device.

Further, in the first, third, and fourth embodiments, the example in which the received power from the power receiving device is acquired has been shown, but the present invention is not limited to this. For example, the power reception voltage may be acquired from the power reception device.

Further, in the second embodiment, the example in which the output power from the power supply unit is acquired has been shown, but the present invention is not limited to this. For example, you may acquire an output voltage from a power supply part.

Moreover, in the said 1st-5th embodiment, the example which the number of the electric power feeding coils provided in the electric power feeder was one was shown, but this invention is not limited to this. The number of power feeding coils may be plural.

Moreover, in the said 1st-5th embodiment, when performing an approximate determination, the example which performed the determination from the absolute value of a plot result was shown, but this invention is not restricted to this. For example, the determination may be made based on the waveform shape of the plot result.

Moreover, in the said 1st-5th embodiment, although the example which set the predetermined number of the power receiving apparatus which a communication part can connect by communication to 3 was shown, this invention is not restricted to this. For example, the predetermined number may be four or more.

Further, in the above-described first to fifth embodiments, 1 hour or 0.5 hour is shown as an example of the constant time for observing changes in the electric power and the remaining capacity of the secondary battery, but the present invention is not limited to this. .. For example, the time may be other than 1 hour or 0.5 hour.

Moreover, in the said 1st-5th embodiment, although the example which makes a-p which is a coefficient of the formula showing a predicted change pattern into 1 was shown, this invention is not restricted to this. It may be a constant other than 1.

In the first to fifth embodiments, the example in which the power receiving device having the largest difference between the maximum operating voltage and the power receiving voltage is set as the disconnection candidate when there are two or more communication disconnection candidates has been described. Is not limited to this. In the present invention, in order to prevent the power receiving device 200 from being charged due to the power receiving voltage being lower than the minimum operating voltage, the power receiving device having the largest difference between the minimum operating voltage and the power receiving voltage may be the disconnection candidate. ..

In each of the first to fifth embodiments described above, a type in which the change pattern of the communication disconnection candidate with respect to the elapsed time of power reception is similar will be described as an example. The present invention is also applied when the change patterns of the communication disconnection candidates with respect to the elapsed time of the power reception simultaneously include the change patterns in the first to fifth embodiments. In this situation, the one that does not receive power or changes over time is selected as the priority disconnection target. For example, a communication disconnection candidate is a power receiving device that has a change pattern that changes with time as in the first, second, fourth, and fifth embodiments, and a power receiving device that has a change pattern that does not change with time as in the third embodiment. In the case of a device, a power receiving device having a change pattern that does not change with time as in the third embodiment may be preferentially disconnected.

In addition, in the first to fifth embodiments, for convenience of description, the processing of the control unit of the present invention has been described using the flow-driven flowchart that sequentially performs processing along the processing flow, but the present invention is not limited to this. Not limited. In the present invention, the processing operation of the control unit may be performed by an event driven type (event driven type) process that executes a process for each event. In this case, the event driving may be completely performed, or the event driving and the flow driving may be combined.

1 power supply unit 2 power supply control unit 3 communication destination selection unit 4, 41, 42, 43, 44 storage unit 5 time measurement unit 6, 61, 62 determination unit 7 communication unit 8 power feeding coil 9 power measurement unit 100, 101, 102, 300, 400 Power feeding device 200, 201, 202, 500 Power receiving device

Claims (18)

A power supply coil for supplying electric power to a plurality of power receiving devices,
A communication unit configured to be communicatively connectable to the plurality of power receiving devices,
An actual measurement change pattern of the information regarding the power supply of the power supply coil over time, and a predicted change pattern of the information regarding the power supply over time, and a determination unit that determines whether or not they are approximate,
A power supply device configured to control so as to preferentially disconnect a communication connection with the power receiving device determined to be similar by the determination unit. The actual measurement change pattern includes a plurality of plot results,
The determination unit, each of the plot results is within a certain range from the predicted value of the predicted change pattern, and when the plurality of plot results and a certain proportion or more of the predicted change pattern substantially match, The power supply device according to claim 1, wherein the power supply device is configured to determine that the actually measured change pattern is similar to the predicted change pattern. The connection with the power receiving device determined to be similar is preferentially disconnected when there is a communication connection request from the power receiving devices exceeding the number of the communication units capable of simultaneously communicating. The power supply device according to. The communication unit is configured to acquire power reception information from the power reception device connected through communication,
The power supply device according to claim 1, wherein the information regarding the power supply includes the power reception information of the power reception device. The received power information includes received power of the power receiving device,
The power supply device according to claim 4, wherein the predicted change pattern includes a change pattern of the required power of the power receiving device over time. The predicted change pattern, including the change pattern has been reduced a predetermined time after continued to increase certain time, the power feeding device according to any one of claims 1 to 5. The predicted change pattern is a predetermined time or more unchanging change pattern including feed unit according to any one of claims 1 to 5. The predicted change pattern is a predetermined time or longer continues to decrease the variation pattern including feed unit according to any one of claims 1 to 5. The power reception information includes the remaining capacity of the secondary battery of the power reception device,
The power supply device according to claim 4, wherein the predicted change pattern includes a change pattern in which the remaining capacity of the secondary battery is saturated after a lapse of a certain time. Further equipped with a power supply unit,
The power supply device according to claim 1, wherein the information regarding the power supply includes output information of the power supply unit. The power supply device according to claim 10, wherein the output information of the power supply unit includes output power of the power supply unit. The power supply device according to claim 11, wherein the predicted change pattern includes a change pattern in which the output power continues to increase for a certain period of time and then decreases for a certain period of time. When the number of the power receiving devices determined to be similar is two or more, the determining unit preferentially disconnects the power receiving device having the largest difference between the minimum operating voltage and the power receiving voltage among the power receiving devices. The power feeding device according to claim 1, wherein the power feeding device is configured to be controlled according to claim 1. When the determining unit determines that there are two or more power receiving devices that are determined to be close to each other and any of the predicted change patterns is a change pattern in which the required power of the power receiving device continues to decrease for a certain period of time or more, The power feeding device according to claim 5, wherein the power receiving device is configured to be controlled to preferentially disconnect the power receiving device when the required power is less than or equal to a predetermined value. If the number of the power receiving devices that are determined to be close to each other is two or more and the predicted change patterns are change patterns in which the required power of the power receiving device does not change for a certain period of time or more, the determination unit is supplied with power. The power feeding device according to claim 5, wherein the power receiving device is configured to be controlled to preferentially disconnect the power receiving device having a long elapsed time. The determination unit is approximated to have been judged the power receiving device is at least two, and the power receiving device required power of the power receiving device in a prediction variation pattern corresponds to the change pattern that does not vary more than a predetermined time The power supply device according to claim 5, wherein the power supply device is configured to be controlled to be disconnected preferentially. If the number of the power receiving devices that are determined to be close to each other is two or more and all of the predicted change patterns are change patterns that are saturated after a lapse of a fixed time, the determination unit determines that the secondary battery The power feeding device according to claim 1, wherein the power receiving device having the smallest difference between the maximum capacity and the current capacity is controlled to be preferentially disconnected. The determination unit, when it is determined to approximate the power receiving device Ru der two or more, based on the charge status of the secondary battery of the power receiving device, preferentially a power receiving device almost fully charged The power feeding device according to claim 1, wherein the power feeding device is configured to be controlled to be cut off.

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