Charging device and control method of charging device

Abstract

The present disclosure provides a charging device capable of efficiently cooling and a method for controlling the charging device. The charging device is provided with a shell, a second coil, a fan and a controller. An object to be charged having a first coil can be disposed in the housing. The housing has an intake port and an exhaust port. The second coil is disposed in the housing. The second coil can be electromagnetically coupled with the first coil in the charged object. The fan is disposed in a flow path from the intake port to the exhaust port. The controller acquires state information related to a charging state from an object to be charged. The controller controls the rotating speed of the fan according to the state information.

Description

Technical Field

[0001] The present disclosure relates to a charging device and a method for controlling the charging device. Background Art

[0002] In a charging device capable of wireless charging, when an object to be charged is placed near the main surface, electric power can be transmitted to the object to be charged using electromagnetic energy or the like to achieve wireless charging.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2021-040452 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] In charging devices, heat is sometimes generated during charging, which limits the charging speed of wireless charging. Efficient cooling is desired to increase the speed of wireless charging.

[0008] The present disclosure provides a charging device capable of efficient cooling and a method for controlling the charging device.

[0009] Solutions for solving problems

[0010] The charging device disclosed herein comprises a housing, a second coil, a fan, and a controller. A charged object having a first coil can be disposed in the housing. The housing has an air intake and an air exhaust. The second coil is disposed within the housing. The second coil can be electromagnetically coupled to the first coil in the charged object. The fan is disposed in the flow path from the air intake to the air exhaust. The controller obtains status information related to the charging status from the charged object. The controller controls the fan speed based on the status information.

[0011] Effects of the Invention

[0012] According to the charging device and the control method of the charging device according to the present disclosure, efficient cooling can be performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view showing a schematic structure of a charging device according to an embodiment.

[0014] Figure 2 It is a block diagram showing the configuration of a charging device according to an embodiment.

[0015] Figure 3 This is a flowchart showing the operation of the charging device according to the embodiment.

[0016] Figure 4It is a waveform diagram showing the operation of the charging device according to the embodiment.

[0017] Figure 5 This is a flowchart illustrating the operation of the charging device according to the first modified example of the embodiment.

[0018] Figure 6 This is a flowchart illustrating the operation of the charging device according to the second modified example of the embodiment.

[0019] Figure 7 This is a flowchart showing the operation of the charging device according to the third modified example of the embodiment.

[0020] Figure 8 This is a flowchart showing the operation of the charging device according to the fourth modified example of the embodiment. DETAILED DESCRIPTION

[0021] Hereinafter, embodiments of the charging device according to the present disclosure will be described with reference to the accompanying drawings.

[0022] (Implementation Method)

[0023] In the charging device according to the embodiment, when an object to be charged is placed near the main surface, power can be transmitted to the object to be charged using electromagnetic energy or the like to achieve wireless charging. However, a design is implemented to efficiently cool the heat generated during charging.

[0024] The charging device 1 can be used as Figure 1 Hereinafter, the direction perpendicular to the main surface 2a of the charging device 1 is referred to as the Z direction, the longitudinal direction of the charging device 1 is referred to as the X direction, and the direction perpendicular to the X and Z directions is referred to as the Y direction. Figure 1 1 is a cross-sectional view showing the structure of the charging device 1 , and shows an XZ cross section when the charging device 1 is cut so as to pass through the coil.

[0025] The charging device 1 has a wireless charging function, and a charged object 100 can be placed on its main surface 2a via a charging platform 19. The charged object 100 supports the wireless charging function. The charged object 100 can be an electronic device with a display such as a smartphone terminal, a tablet terminal, a smart watch, or an electronic device without a display such as a wireless headset, a wireless speaker, or a wireless mouse. Figure 1 3 shows an example of a state where the object to be charged 100 is placed on the main surface 2 a via the charging table 19 .

[0026] The charging device 1 has a shell 2, a substrate 3, a substrate 4, a coil 16, a position detection coil 18, a controller 22, a fan 23, and a temperature sensor 24. The coil 16 of the charging device 1 is arranged near the main surface 2a in the shell 2. The charged object 100 has a surface 100a and a back surface 100b. The charged object 100 has a coil 116 near the back surface 100b. The charging device 1 may also have a mobile wireless charging function, or may be configured so that the coil 16 can move in the XY direction in the shell 2. The charging device 1 detects the XY position of the coil 116 through the position detection coil 18. The charging device 1 moves the coil 16 in the XY direction according to the detected XY position. Figure 1 As shown, the XY position of the coil 16 and the XY position of the coil 116 are aligned, thereby enabling electromagnetic coupling between the coil 16 and the coil 116 , and it is also conceivable that high-speed wireless charging can be performed.

[0027] In addition, the charging device 1 may also have a fixed coil type wireless charging function to replace the Figure 1 In this case, the coil moving mechanism 17 (see FIG. 1 ) is omitted in the charging device 1. Figure 2 ) and a position detection coil 18. In addition, one or more coils 16 are provided. In the case of a plurality of coils 16, the coils 16 are arranged in the XY direction.

[0028] During wireless charging, the charging device 1 may increase the temperature of the object 100, limiting the wireless charging speed. For example, according to the Qi standard established by the Wireless Power Consortium (WPC), communication is established between the charging device (power transmitter) 1 and the object 100 (power receiver) after charging begins.

[0029] During wireless charging, induced currents flow through coils 16 and 116, respectively, generating heat near each of coils 16 and 116. The object 100 may be heated by heat conduction from heat sources within the charging device 1 (e.g., components near coil 16), as well as by heat sources within the object 100 itself (e.g., components near coil 116).

[0030] If the object being charged 100 has a temperature protection function for electronic components such as the battery 131, for example, when the temperature detected by the temperature sensor 121 near the coil 116 rises above a predetermined temperature, the object being charged 100 activates the temperature protection function. The object being charged 100, in compliance with the temperature protection function, sends a request to the charging device 1 to reduce the power (or speed) of the power transmission. Accordingly, when the charging device 1 reduces the power transmitted to the object being charged 100, the power received by the object being charged 100 decreases, potentially reducing the speed of wireless charging.

[0031] In response to this situation, the charging device 1 is provided with an air cooling structure for air cooling the coils 16 and 116 .

[0032] exist Figure 1 The housing 2 shown is provided with an air intake port 2i and an air exhaust port 2o. A flow path from the air intake port 2i to the air exhaust port 2o is provided in the housing 2 so as to pass near the coil 16, and a fan 23 is arranged in the middle of the flow path. Figure 1 Although the configuration in which the fan 23 is arranged near the exhaust port 2o is illustrated, the fan 23 may be arranged at another position in the middle of the flow path.

[0033] In the air-cooling configuration, by driving fan 23, air is drawn from the outside into air inlet 2i, as indicated by the dotted arrows. This generates an airflow that flows from air inlet 2i through the vicinity of coil 16, reaches exhaust port 2o, and is discharged from exhaust port 2o to the outside. The air reaching the vicinity of coil 16 from air inlet 2i undergoes heat exchange near coil 16. The air, heated by the heat exchange, is transported by fan 23 to exhaust port 2o and discharged to the outside. This allows air cooling of coil 16, and also allows for indirect air cooling of coil 116 via substrate 3, position detection coil 18, housing 2, and charging platform 19. Consequently, when the temperature detected by temperature sensor 121 drops below a predetermined temperature, the temperature protection function is deactivated, and the device 100 sends a request to the charging device 1 to increase the power transmission (or transmission speed). In response, when the charging device 1 increases the power transmission to the device 100, the power received by the device 100 increases, potentially restoring the speed of wireless charging.

[0034] The cooling capacity of the air-cooling structure depends on the rotation speed of fan 23. Increasing the rotation speed of fan 23 can improve the cooling capacity of the air-cooling structure. However, the periodic pressure fluctuations caused by the rotation of fan 23 blades in the vicinity of fan 23 are significant, which may increase the noise of fan 23 in charger 1. Furthermore, the power supplied to the fan 23 motor in the vicinity of fan 23 increases, which may increase the power consumption used to drive fan 23 in charger 1.

[0035] According to the Qi standard, the charging device 1 cannot receive temperature-related information from the object 100. A temperature sensor 24 is located near the coil 16, but the temperature detected by the temperature sensor 24 deviates from the temperature detected by the temperature sensor 121 near the coil 116. This makes it difficult for the charging device 1 to directly determine the temperature near the coil 116. However, according to the Qi standard, the charging device 1 can receive status information related to the received power from the object 100. By using this status information, the charging device 1 can indirectly determine whether the temperature protection function of the object 100 is activated.

[0036] Therefore, in this embodiment, the charging device 1 receives status information related to the received power from the charged object 100 and controls the rotation speed of the fan 23 based on this status information, thereby providing efficient air cooling and achieving a balance between increasing the speed of wireless charging and suppressing noise from the fan 23. Furthermore, it is possible to further achieve a balance between increasing the speed of wireless charging and reducing the power consumption used to drive the fan 23.

[0037] The charging device 1 can be used as Figure 2 As shown. Figure 2 2 is a block diagram showing the configuration of the charging device 1 .

[0038] In addition to the housing 2, substrate 3, substrate 4, coil 16, position detection coil 18, controller 22, fan 23, and temperature sensor 24, the charging device 1 also includes a capacitor 5, a DC power supply 11, a DC-DC conversion circuit 12, a bridge circuit 13, a voltage detection circuit 14, a current detection circuit 15, a moving mechanism 17, a power receiving coil position detection circuit 20, and a temperature acquisition unit 21.

[0039] In the charging device 1 , the controller 22 comprehensively controls each component of the charging device 1 .

[0040] In addition, the controller 22 can communicate with the object being charged 100. The controller 22 can also receive status information from the object being charged 100 via the coil 16. The object being charged 100 detects the power received from the charging device 1, generates status information indicating the power received, modulates the drive amplitude of the coil 116 based on the status information, generates an AC signal containing a modulation component, and transmits it to the charging device 1 via the coil 116. The object being charged 100 can modulate the drive amplitude using amplitude modulation, modulate the drive frequency using frequency modulation, or modulate the drive parameters using other modulation methods. When the controller 22 receives the AC signal via the coil 16, it extracts the modulation component from the AC signal to restore the status information. The controller 22 can restore the status information using the modulation method corresponding to the object being charged 100. The controller 22 performs actions corresponding to the restored status information.

[0041] For example, the controller 22 controls the rotational speed of the fan 23 according to the status information.

[0042] When stable, the controller 22 controls the rotational speed of the fan 23 to RN1. The controller 22 obtains status information related to the received electric power from the object to be charged 100. The controller 22 can determine the received electric power of the object to be charged 100 according to the status information. When the received electric power of the object to be charged 100 drops by more than a specified power amount ΔP1 per unit time, the controller 22 detects the drop in the received electric power of the object to be charged 100. The specified power amount ΔP1 can be determined in advance through experiments as the power drop amount indicating the drop in the received electric power. When the controller 22 detects the drop in the received electric power of the object to be charged 100, it increases the rotational speed of the fan 23 to RN2 (>RN1). Thus, when the temperature of the object to be charged 100 may be higher than the threshold temperature of the temperature protection function, the cooling capacity of the air-cooling structure can be improved by increasing the rotational speed of the fan 23.

[0043] After that, the controller 22 obtains status information related to the received electric power from the object to be charged 100. When the received electric power of the object to be charged 100 rises by more than a specified power amount ΔP2 per unit time according to the status information, the controller 22 detects the rise in the received electric power. The specified power amount ΔP2 can be determined in advance through experiments as the power rise amount indicating the rise in the received electric power. When the controller 22 detects the rise in the received electric power, it reduces the rotational speed of the fan 23 to RN1 (<RN2). Thus, when the temperature of the object to be charged 100 may be lower than the threshold temperature of the temperature protection function, by reducing the rotational speed of the fan 23, the noise caused by the driving of the fan 23 can be suppressed, and the power consumption caused by the driving of the fan 23 can be suppressed.

[0044] Alternatively, the controller 22 may reduce the speed of the fan 23 if, based on status information, no increase in the power received by the object 100 is detected within a time TM1 from the time the fan 23 speed is increased. The object 100 may have an optimized charging (i.e., italic charging) function. For example, the optimized charging function reduces the requested power to slowly charge the battery 131 when the charge level exceeds a threshold charge level Cth1. The threshold charge level Cth1 may also be 80%. When the optimized charging function is activated in the object 100, the object 100 no longer requests an increase in the transmitted power. If the power received by the object 100 does not increase despite increasing the speed of the fan 23 to increase the cooling capacity of the air-cooling structure, it is expected that the optimized charging function is activated in the object 100. The time TM1 can be determined in advance through experiments to indicate that the power received by the object 100 does not increase despite increasing the speed of the fan 23 to increase the cooling capacity of the air-cooling structure.

[0045] The controller 22 controls the rotation speed of the fan 23 to RN1 when the charging state is stable. When the power received by the object to be charged 100 decreases by more than a specified power amount ΔP1 per unit time, the controller 22 detects the decrease in power received. Upon detecting the decrease in power received by the object to be charged 100, the controller 22 increases the rotation speed of the fan 23 to RN2 (> RN1). The controller 22 starts counting the timer from the time the rotation speed of the fan 23 is increased to RN2. If, based on the status information, the increase in the power received by the object to be charged 100 per unit time is less than the specified power amount ΔP2 until the timer exceeds the time TM1, the controller 22 deems that the optimized charging function has been activated in the object to be charged 100 and reduces the rotation speed of the fan 23 to RN1. Thus, in the case of optimized charging, the rotation speed of the fan 23 can be set not to be continuously increased.

[0046] A DC power supply 11 generates a DC power supply voltage Vdc1. This power supply 11 can be, for example, a battery, a power supply circuit that receives a DC power supply voltage from an external source, or a power supply circuit that receives an AC power supply voltage from an external source and converts it to a DC power supply voltage. The DC power supply 11 provides the DC power supply voltage Vdc1 to the DC-DC converter circuit 12.

[0047] Under the control of the controller 22, the DC-DC converter circuit 12 converts the DC power supply voltage Vdc1 into a DC voltage Vdc2. The DC-DC converter circuit 12 can either boost the DC power supply voltage Vdc1 to convert it to the DC voltage Vdc2, or step down the DC power supply voltage Vdc1 to convert it to the DC voltage Vdc2. Furthermore, the DC power supply voltage Vdc1 can be waveform-modified while maintaining constant voltage while converting it to the DC voltage Vdc2. The DC-DC converter circuit 12 supplies the DC voltage Vdc2 to the bridge circuit 13.

[0048] Under the control of controller 22, bridge circuit 13 converts DC voltage Vdc2 into a single-phase AC voltage Vac1. Bridge circuit 13 may also include a switching element, which is turned on and off in a cycle corresponding to the driving frequency to convert series voltage Vds2 into AC voltage Vac1 in the series LC resonant system formed by capacitor 5 and coil 16. This allows bridge circuit 13 to drive coil 16 via capacitor 5.

[0049] Capacitor 5 is connected between bridge circuit 13 and coil 16. One end of capacitor 5 is connected to the P-side output node of bridge circuit 13, and the other end is connected to coil 16. Capacitor 5 and coil 16 form a series LC resonant system, which can increase the speed of wireless charging by switching bridge circuit 13 near the resonant frequency.

[0050] The coil 16 is connected between the capacitor 5 and the bridge circuit 13. One end of the coil 16 is connected to the capacitor 5, and the other end is connected to the output node on the N side of the bridge circuit 13.

[0051] The voltage detection circuit 14 detects the voltage Vin on the input side of the bridge circuit 13. A detection node of the voltage detection circuit 14 is connected to the line connecting the DC-DC converter circuit 12 and the bridge circuit 13. The voltage detection circuit 14 can also detect the voltage Vin on the input side of the bridge circuit 13 via the detection node. The voltage detection circuit 14 provides the detected voltage Vin to the controller 22.

[0052] The current detection circuit 15 detects the current Iac on the output side of the bridge circuit 13. The current detection circuit 15 supplies the detected current Iac to the controller 22. Thus, the controller 22 can calculate the transmitted power using the voltage Vin and the current Iac.

[0053] The position detection coil 18 is arranged between the coil 16 and the main surface 2a (see Figure 1 The position detection coil 18 includes a plurality of coils distributed along the XY directions.

[0054] The position detection circuit 20 is connected between the position detection coil 18 and the controller 22. The position detection circuit 20 is connected to each of the plurality of coils of the position detection coil 18. The position detection circuit 20 can detect the XY position of the coil 116 under the control of the controller 22.

[0055] The controller 22 can also use the position detection circuit 20 and the position detection coil 18 to detect the XY position of the coil 116 in the charged object 100. The position detection circuit 20 provides pulses to each of the multiple coils of the position detection coil 18 under the control of the controller 22. The multiple coils each generate magnetic flux corresponding to the pulses. When the multiple coils receive the magnetic flux as an echo from the coil 116, they generate corresponding induced currents that return to the position detection circuit 20. The position detection circuit 20 determines the XY position of the coil 116 based on the induced currents in each of the multiple coils. The position detection circuit 20 provides the determined XY position to the controller 22.

[0056] The coil moving mechanism 17 can move the coil 16 in the X and Y directions under the control of the controller 22 .

[0057] The controller 22 may also use the coil moving mechanism 17 to move the coil 16 in the XY directions based on the XY position of the coil 116 detected by the position detection circuit 20. The coil moving mechanism 17 moves the coil 16 in the XY directions under the control of the controller 22 so as to approach the XY position of the coil 116. This allows the XY position of the coil 16 to be positioned so as to coincide with the XY position of the coil 116, thereby enabling the coil 16 to be electromagnetically coupled to the coil 116.

[0058] Next, use Figure 3 The operation of the charging device 1 will be described. Figure 3 This is a flowchart showing the operation of the charging device 1 .

[0059] The charging device 1 detects the position of the object to be charged when a predetermined trigger condition is satisfied ( S1 ). The predetermined trigger condition may be the activation of the charging device 1 or the placement of the object to be charged 100 near the main surface 2 a via the charging table 19 .

[0060] The charging device 1 uses the position detection circuit 20 and the position detection coil 18 to detect the XY position of the coil 116, and uses the coil moving mechanism 17 to move the coil 16 to the detected XY position (S2). The charging device 1 and the charged object 100 exchange information related to the power level that can be transmitted to confirm the upper limit of the power level, etc., thereby negotiating (S3). As a result, the charging device 1 determines the negotiated power corresponding to the upper limit of the power level. The negotiated power can also be the maximum value of the effective power that can be transmitted from the charging device 1 to the charged object 100.

[0061] Once the negotiation is complete, the charging device 1 begins wireless charging (S4). The charging device 1 begins transmitting power to the object 100 via the coil 16. Simultaneously, the charging device 1 begins driving the fan 23 at a rotational speed RN1 to cool the interior of the housing 2 via the air cooling mechanism. The charging device 1 continues wireless charging (S5). After a predetermined period, the charging device 1 receives status information from the object 100. Based on the status information, the charging device 1 determines whether the power received by the object 100 has decreased (S6). The charging device 1 calculates the decrease in the power received per unit time indicated by the status information and compares it with a predetermined power level ΔP1. If the decrease in the power received per unit time is less than the predetermined power level ΔP1, the charging device 1 determines that the power received by the object 100 has not decreased ("No" in S6), and continues wireless charging (S5).

[0062] If the amount of power received per unit time decreases by more than a predetermined power amount ΔP1, the charging device 1 determines that the power received by the object 100 has decreased ("YES" in S6) and determines whether the object 100 is fully charged (S7). If the charging device 1 receives a notification of charging completion from the object 100, it determines that the object 100 is fully charged ("YES" in S7), stops wireless charging (S8), and ends the process.

[0063] If the charging device 1 does not receive a charging completion notification from the device 100, it assumes that the device 100 is not fully charged ("No" in S7), increases the rotation speed of the fan 23 from RN1 to RN2 (S9), and starts a timer. The charging device 1 maintains the rotation speed of the fan 23 at RN2 (S10) and, after a predetermined period, receives status information from the device 100. Based on the status information, the charging device 1 determines whether the power received by the device 100 has increased (S11). The charging device 1 calculates the increase in the power received per unit time indicated by the status information and compares this increase in power per unit time with a predetermined power level ΔP2.

[0064] If the amount of increase in received power per unit time is less than the predetermined power amount ΔP2, the charging device 1 determines that the received power of the charged object 100 has not increased ("No" in S11) and determines whether time TM1 has elapsed since the rotation speed of the fan 23 was increased (S12). The charging device 1 compares the timer's count with time TM1. If the timer's count does not exceed time TM1, the charging device 1 determines that time TM1 has not elapsed since the rotation speed of the fan 23 was increased ("No" in S12), and the process returns to S10. If the timer's count exceeds time TM1, the charging device 1 determines that time TM1 has elapsed since the rotation speed of the fan 23 was increased ("Yes" in S12), and reduces the rotation speed of the fan 23 from RN2 to RN1 (S13), and the process returns to S5.

[0065] When the amount of increase in the received power per unit time is greater than or equal to the predetermined power amount ΔP2, the charging device 1 deems that the received power of the charged object 100 has increased ("Yes" in S11), reduces the rotation speed of the fan 23 from RN2 to RN1 (S13), and returns the process to S5.

[0066] The loop process of S5 to S13 is repeated until "Yes" is determined in S7. Thus, wireless charging can be performed until the object to be charged 100 is fully charged.

[0067] Next, use Figure 4 Next, a use case of the charging device 1 will be described. Figure 4 It is a waveform diagram showing the operation of the charging device 1. Figure 4 In the chart, the vertical axis represents power, temperature or charge level, and the horizontal axis represents time. Figure 4 In the figure, the solid line represents the power received by the object 100, the dashed-dotted line represents the temperature detected by the temperature sensor 121, and the two-dotted dashed line represents the charge level of the battery 131. The slope of the two-dotted dashed line represents the charging speed of the battery 131, indicating the charging speed of the wireless charging performed by the charging device 1.

[0068] At time t0, the charging device 1 receives a power increase request from the object 100 when it is started. In response to the power increase request, the charging device 1 starts to supply power P1a to the object 100 and starts driving the fan 23 at a rotation speed RN1. Figure 4It corresponds to the target power P1 shown. The charging of the battery 131 starts, and its charge amount starts to increase at the charging speed V1. At the same time, the temperature around the battery 131 starts to rise, and the detected temperature of the temperature sensor 121 starts to rise. The object to be charged 100 starts to send status information indicating the received power P1a to the charging device 1. The charging device 1 receives the status information from the object to be charged 100, and based on the status information, determines that the decrease amount per unit time of the received power P1a of the object to be charged 100 is less than the specified power amount ΔP1, and thus maintains the rotation speed of the fan 23 at RN1.

[0069] At time t1, when the detected temperature of the temperature sensor 121 exceeds the threshold temperature of the temperature protection function and reaches T1, the object to be charged 100 activates the temperature protection function and sends a power reduction request to the charging device 1 in accordance with the temperature protection function. The charging device 1 receives the power reduction request from the object to be charged 100, and based on the power reduction request, reduces the power provided to the object to be charged 100 from P1a to P2a. The power P2a corresponds to Figure 4 the target power P2 shown. The received power of the object to be charged 100 drops from P1a to P2a. Along with this, the charging speed of the battery 131 drops from V1 to V2. The object to be charged 100 starts to send status information indicating the received power P2a (<P1a) to the charging device 1. The charging device 1 receives the status information from the object to be charged 100, and based on the status information, determines that the decrease amount per unit time of the received power of the object to be charged 100 is above the specified power amount ΔP1, and thus raises the rotation speed of the fan 23 from RN1 to RN2. As a result, the cooling capacity of the air-cooling structure increases, and the temperature around the battery 131 starts to drop.

[0070] At time t2, when the detected temperature of the temperature sensor 121 drops below the threshold temperature of the temperature protection function and drops to T2, the object to be charged 100 deactivates the temperature protection function and sends a power increase request to the charging device 1. The charging device l receives the power increase request from the object to be charged 100, and based on the power increase request, raises the power provided to the object to be charged 100 from P2a to P1a. The received power of the object to be charged 100 rises from P2a to P1a. Along with this, the charging speed of the battery 131 increases from V2 to V1. The object to be charged 100 starts to send status information indicating the received power P1a to the charging device 1. The charging device 1 receives the status information from the object to be charged 100, and based on the status information, determines that the increase amount per unit time of the received power of the object to be charged 100 is above the specified power amount ΔP2, and thus reduces the rotation speed of the fan 23 from RN2 to RN1. As a result, the cooling capacity of the air-cooling structure decreases, and the temperature around the battery 131 starts to rise.

[0071] The same operations as at times t1 and t2 are also repeated at times t3 to t6.

[0072] At time t7, when the charge level of battery 131 reaches C7a and exceeds the full charge threshold, the object 100 determines that battery 131 has reached a full charge state and sends a charge completion notification to the charging device 1. Upon receiving the charge completion notification from the object 100, the charging device 1 stops supplying power to the object 100 and stops the fan 23. On the other hand, if the charging device 1 receives a power reduction request from the object 100 instead of receiving the charge completion notification, it continues supplying power to the object 100 at a low power level (e.g., close to 0 W) and continues driving the fan 23.

[0073] like Figure 4 As shown, during the periods t1 to t2, t3 to t4, and t5 to t6, the speed of fan 23 can be temporarily increased to temporarily enhance the cooling capacity of the air-cooling structure, thereby disabling the temperature protection function. Consequently, during the periods t2 to t3, t4 to t5, and t6 to t7, high-speed power transmission compliant with the Qi standard can be performed, thereby increasing the speed of wireless charging. Furthermore, during the periods t2 to t3, t4 to t5, and t6 to t7, the speed of fan 23 can be returned to a stable speed to suppress noise from fan 23 of charger 1. Furthermore, since the speed increase of fan 23 can be suppressed, the power consumption used to drive fan 23 can be reduced.

[0074] exist Figure 4 For comparison, the dashed line shows the charge level of battery 131 in the case of RN1, when the rotation speed of fan 23 is maintained stable even after time t1. In this case, high-speed power transmission compliant with the Qi standard cannot be performed after time t1, so the charging rate from time t1 to t7 drops to V2 and remains constant. Therefore, at time t7, the charge level is C7, which is less than the full charge threshold, and charging device 1 is not fully charged.

[0075] As described above, in this embodiment, charging device 1 receives status information regarding received power from object 100 and controls the rotation speed of fan 23 based on this status information. This allows for efficient air cooling, thereby achieving both faster wireless charging and reduced noise from fan 23.

[0076] Furthermore, in this embodiment, the charging device 1 can control the rotation speed of the fan 23 based on the status information to suppress an increase in the rotation speed of the fan 23 , thereby achieving both faster wireless charging and reduced power consumption.

[0077] Furthermore, the status information on the received power may include information indicating the received power and information indicating the requested power.

[0078] Alternatively, the charging device 1 may also have a fixed coil type wireless charging function to replace the Figure 1 , which illustrates a mobile wireless charging function. In this case, the coil moving mechanism 17 and the position detection coil 18 are omitted from the charging device 1. Furthermore, one or more coils 16 are provided. In the case of multiple coils 16, the coils 16 are arranged in the XY direction. The position detection circuit 20 energizes the multiple coils 16 and observes their responses, thereby identifying the coil 16 closest to the coil 116 among the multiple coils 16. The controller 22 can selectively energize the identified coil 16 via the DC-DC converter circuit 12 and the bridge circuit 13.

[0079] Alternatively, the air cooling structure in the charging device 1 may also be the same as that in Figure 1 For example, the air flow can also be different from the structure shown in the example. Figure 1 Alternatively, the fan 23 may draw air from the outside and deliver it into the housing 2. Alternatively, a discharge port extending to the Z height of the object 100 and facing the object 100 may be provided on the -X side of the housing 2, and a flow path extending from the inside of the housing 2 to the discharge port may be provided. In this case, air can be delivered to the vicinity of the housing of the object 100, directly cooling the object 100.

[0080] Alternatively, when increasing the rotation speed of fan 23, controller 22 may increase it step by step from RN1 to RN2. Controller 22 may also increase the rotation speed of fan 23 from RN1 to RN2 in N steps. N is an integer greater than or equal to 3. This can suppress noise associated with changes in airflow when the rotation speed of fan 23 increases.

[0081] Alternatively, when reducing the rotation speed of fan 23, controller 22 may reduce the rotation speed of fan 23 stepwise from RN2 to RN1. Controller 22 may also reduce the rotation speed of fan 23 from RN2 to RN1 in M ​​steps. M is an integer greater than or equal to 3. This can suppress noise associated with changes in airflow when the rotation speed of fan 23 is reduced.

[0082] Alternatively, controller 22 may increase the speed of fan 23 step by step from RN1 to RN2 when increasing the speed of fan 23, or may decrease the speed of fan 23 step by step from RN2 to RN1 when decreasing the speed of fan 23. Controller 22 may increase the speed of fan 23 from RN1 to RN2 in N steps, or may decrease the speed of fan 23 from RN2 to RN1 in M ​​steps. N is an integer greater than or equal to 3, and M is an integer greater than or equal to 3. N and M may be the same or different. This suppresses the noise associated with the fluctuations in airflow when the speed of fan 23 increases and decreases.

[0083] Alternatively, as a first modification of the embodiment, the charging device 1 may perform control taking the negotiated power into consideration.

[0084] For example, in the charging device 1, the controller 22 may also increase the speed of the fan 23 if it detects, based on status information, that the power received by the object 100 being charged is lower than the negotiated power at the start of charging. According to the Qi standard, before the charging device 1 begins transmitting power to the object 100, information regarding the power level that can be transmitted is exchanged between the two devices to negotiate and determine the negotiated power. The negotiated power may also be the maximum effective power that can be transmitted from the charging device 1 to the object 100. If the power received by the object 100 being charged is lower than the negotiated power at the start of charging, it is expected that the temperature protection function in the object 100 will be activated immediately after charging begins.

[0085] During stable conditions, the controller 22 controls the speed of the fan 23 to RN1. The controller 22 obtains status information related to the received power from the object 100. If the received power, as determined based on this status information, is lower than the negotiated power at the start of charging, the controller 22 increases the speed of the fan 23 to RN2 (> RN1). This allows the cooling capacity of the air-cooling structure to be enhanced by increasing the speed of the fan 23 when the temperature of the object 100 is likely to exceed the temperature protection threshold from the start of charging.

[0086] In this case, if Figure 5 As shown, the charging device 1 may also operate differently from the embodiment in the following respects. Figure 5 This is a flowchart showing the operation of the charging device 1 according to the first modified example of the embodiment.

[0087] After performing S1 to S4 as in the embodiment, the charging device 1 receives status information from the object 100 at a predetermined period. The charging device 1 determines whether there is a difference between the received power of the object 100 and the negotiated power based on the status information (S21).

[0088] The charging device 1 calculates the difference between the received power indicated by the status information and the negotiated power. If the difference is less than the threshold difference Dth, the charging device 1 determines that there is no difference between the received power of the object 100 and the negotiated power ("No" in S21). The charging device 1 does not detect that the received power of the object 100 is lower than the negotiated power, and the process proceeds to S5.

[0089] The charging device 1 calculates the difference between the received power indicated in the status information and the negotiated power. If the difference is greater than the threshold difference Dth, it determines that there is a difference between the received power of the object 100 and the negotiated power ("YES" in S21). This indicates that the received power of the object 100 is lower than the negotiated power, and the process proceeds to S7. Consequently, if the object 100 is not fully charged ("NO" in S7), the charging device 1 increases the rotation speed of the fan 23 (S9). Then, steps S10 to S13 are repeated as in the embodiment.

[0090] As described above, in the first variant of the embodiment, when the charging device 1 detects based on status information at the start of charging that the power received by the object 100 is lower than the negotiated power, the controller 22 increases the rotation speed of the fan 23. This allows the cooling capacity of the air cooling structure to be enhanced by increasing the rotation speed of the fan 23, even when the temperature of the object 100 is likely to exceed the threshold temperature of the temperature protection function from the start of charging.

[0091] Alternatively, as a second modification of the embodiment, the charging device 1 may perform control taking into account the temperature detected by the temperature sensor 24 .

[0092] For example, in the charging device 1, the controller 22 may maintain the rotation speed of the fan 23 when, based on the status information, it detects a decrease in the power received by the charged object 100 and the temperature detected by the temperature sensor 24 is lower than the threshold temperature Tth1. Sometimes, the charged object 100 has an optimized charging function. Even if the temperature of the charged object 100 is lower than the threshold temperature of the temperature protection function, the optimized charging function is activated. When the temperature detected by the temperature sensor 24 is lower than the threshold temperature Tth1, it is expected that the temperature of the charged object 100 is lower than the threshold temperature of the temperature protection function. The threshold temperature Tth1 can be determined in advance through experiments to indicate that the temperature of the charged object 100 is lower than the threshold temperature of the temperature protection function.

[0093] During stable operation, the controller 22 controls the speed of the fan 23 to RN1. The controller 22 obtains status information related to the power received by the object 100. If, based on this status information, the controller detects a decrease in the power received by the object 100 and the temperature detected by the temperature sensor 24 is lower than the threshold temperature Tth1, the controller 22 assumes that the temperature of the object 100 is lower than the threshold temperature for the temperature protection function and that the optimized charging function has been activated in the object 100, maintaining the speed of the fan 23 at RN1. This prevents the speed of the fan 23 from increasing during optimized charging.

[0094] Alternatively, after increasing the rotation speed of the fan 23, the controller 22 may maintain the rotation speed of the fan 23 if, based on the status information, it detects an increase in the power received by the object to be charged 100 and the temperature detected by the temperature sensor 24 is above the threshold temperature Tth1. If an increase in the power received by the object to be charged 100 is detected but the temperature detected by the temperature sensor 24 is above the threshold temperature Tth1, it is expected that the temperature of the object to be charged 100 has not sufficiently decreased.

[0095] During stability, the controller 22 controls the rotation speed of the fan 23 to RN1. When the amount of decrease per unit time in the received power of the object being charged 100 exceeds a predetermined power amount ΔP1, the controller 22 detects a decrease in received power. Upon detecting a decrease in the received power of the object being charged 100, the controller 22 increases the rotation speed of the fan 23 to RN2 (> RN1). The controller 22 starts a timer from the time the rotation speed of the fan 23 is increased to RN2. When the amount of increase per unit time in the received power of the object being charged 100 corresponding to the status information exceeds a predetermined power amount ΔP2, the controller 22 detects an increase in received power. If the controller 22 detects an increase in the received power of the object being charged 100 based on the status information and the temperature detected by the temperature sensor 24 is above the threshold temperature Tth1, the controller 22 maintains the rotation speed of the fan 23 at RN2 until the timer exceeds the time TM1. Thus, when the temperature of the object to be charged 100 temporarily becomes lower than the threshold temperature of the temperature protection function but may immediately become higher than the threshold temperature, the rotation speed of the fan 23 can be continuously increased to continuously improve the cooling capacity of the air cooling structure.

[0096] In this case, if Figure 6 As shown, the charging device 1 may also operate differently from the embodiment in the following respects. Figure 6 This is a flowchart showing the operation of the charging device 1 according to the second modified example of the embodiment.

[0097] After performing S1 to S6 as in the embodiment, if the object 100 is not fully charged (No in S7 ), the charging device 1 determines whether the temperature detected by the temperature sensor 24 is equal to or higher than the threshold temperature Tth1 ( S31 ).

[0098] If the temperature detected by temperature sensor 24 is not equal to or higher than threshold temperature Tth1 (NO in S31 ), charging device 1 considers that the optimized charging function is activated and returns the process to S5 while maintaining the rotation speed of fan 23 .

[0099] If the temperature detected by temperature sensor 24 is equal to or higher than threshold temperature Tth1 (YES in S31 ), charging device 1 determines that the optimized charging function is not activated and increases the rotation speed of fan 23 ( S9 ). Thereafter, steps S10 to S12 are performed in the same manner as in the embodiment.

[0100] If the increase in the received power per unit time is greater than or equal to the predetermined power amount ΔP2, the charging device 1 determines that the received power of the charged object 100 has increased ("YES" in S11), and determines whether the temperature detected by the temperature sensor 24 is greater than or equal to the threshold temperature Tth1 (S32).

[0101] If the temperature detected by the temperature sensor 24 is above the threshold temperature Tth1 ("Yes" in S32), the charging device 1 determines that the temperature of the charged object 100 has not dropped sufficiently, and thus maintains the rotation speed of the fan 23 at RN2 (S10) and performs the judgment of S11 again.

[0102] If the temperature detected by the temperature sensor 24 is lower than the threshold temperature Tth1 (No in S32 ), the charging device 1 determines that the temperature of the object 100 has sufficiently decreased, and reduces the rotation speed of the fan 23 from RN2 to RN1 ( S13 ), returning the process to S5 .

[0103] As described above, in the second modified embodiment, when a decrease in the power received by the charged object 100 is detected based on the status information and the temperature detected by the temperature sensor 24 is lower than the threshold temperature Tth1, the charging device 1 maintains the rotation speed of the fan 23. This allows for optimizing charging without increasing the rotation speed of the fan 23.

[0104] Furthermore, in the second modified embodiment, after increasing the rotation speed of fan 23, if an increase in the power received by the device 100 is detected based on status information and the temperature detected by temperature sensor 24 is above threshold temperature Tth1, charging device 1 maintains the rotation speed of fan 23. Thus, even if the temperature of the device 100 temporarily falls below the threshold temperature for the temperature protection function but is likely to rise above this threshold temperature immediately, the rotation speed of fan 23 can be continuously increased, thereby continuously improving the cooling capacity of the air-cooling structure.

[0105] Alternatively, as a third modification of the embodiment, the charging device 1 may perform control that combines the control of the first modification of the embodiment and the control of the second modification of the embodiment.

[0106] In this case, if Figure 7 As shown, the charging device 1 may also operate differently from the embodiment in the following respects. Figure 7 This is a flowchart showing the operation of the charging device 1 according to the third modified example of the embodiment.

[0107] After performing S1 to S4 as in the embodiment, the charging device 1 receives status information from the object 100 at a predetermined period. The charging device 1 determines whether there is a difference between the received power of the object 100 and the negotiated power based on the status information (S21).

[0108] The charging device 1 calculates the difference between the received power indicated by the status information and the negotiated power. If the difference is less than the threshold difference Dth, the charging device 1 determines that there is no difference between the received power of the object 100 and the negotiated power ("No" in S21). The charging device 1 does not detect that the received power of the object 100 is lower than the negotiated power, and the process proceeds to S5.

[0109] The charging device 1 calculates the difference between the received power indicated in the status information and the negotiated power. If the difference is greater than a threshold difference Dth, the charging device 100 determines that there is a difference between the received power and the negotiated power ("YES" in S21). This indicates that the received power of the device 100 is lower than the negotiated power, and the process proceeds to S7. If the device 100 is not fully charged ("NO" in S7), the charging device 1 determines whether the temperature detected by the temperature sensor 24 is greater than a threshold temperature Tth1 (S31).

[0110] If the temperature detected by temperature sensor 24 is not equal to or higher than threshold temperature Tth1 (NO in S31 ), charging device 1 considers that the optimized charging function is activated and returns the process to S5 while maintaining the rotation speed of fan 23 .

[0111] If the temperature detected by temperature sensor 24 is equal to or higher than threshold temperature Tth1 (YES in S31 ), charging device 1 determines that the optimized charging function is not activated and increases the rotation speed of fan 23 ( S9 ). Thereafter, steps S10 to S12 are performed in the same manner as in the embodiment.

[0112] If the increase in the received power per unit time is greater than or equal to the predetermined power amount ΔP2, the charging device 1 determines that the received power of the charged object 100 has increased ("YES" in S11), and determines whether the temperature detected by the temperature sensor 24 is greater than or equal to the threshold temperature Tth1 (S32).

[0113] If the temperature detected by the temperature sensor 24 is above the threshold temperature Tth1 ("Yes" in S32), the charging device 1 determines that the temperature of the charged object 100 has not dropped sufficiently, and thus maintains the rotation speed of the fan 23 at RN2 (S10) and performs the judgment of S11 again.

[0114] If the temperature detected by the temperature sensor 24 is lower than the threshold temperature Tth1 (No in S32 ), the charging device 1 determines that the temperature of the object 100 has sufficiently decreased, and reduces the rotation speed of the fan 23 from RN2 to RN1 ( S13 ), returning the process to S5 .

[0115] As described above, in the third variant of the embodiment, when charging begins, the charging device 1 detects based on status information that the power received by the device 100 is lower than the negotiated power, it increases the rotation speed of the fan 23. This increases the cooling capacity of the air-cooling structure by increasing the rotation speed of the fan 23 when the temperature of the device 100 is likely to exceed the threshold temperature of the temperature protection function from the start of charging.

[0116] Furthermore, in the third modified embodiment, when a decrease in the power received by the object to be charged 100 is detected based on the status information and the temperature detected by the temperature sensor 24 is lower than the threshold temperature Tth1, the charging device 1 maintains the rotation speed of the fan 23. This allows the fan 23 to be kept from rotating at an increased speed when optimizing charging.

[0117] Furthermore, in the third modified embodiment, after increasing the rotation speed of fan 23, if an increase in the power received by the device 100 is detected based on status information and the temperature detected by temperature sensor 24 is above threshold temperature Tth1, charging device 1 maintains the rotation speed of fan 23. Thus, even if the temperature of the device 100 temporarily falls below the threshold temperature of the temperature protection function but is likely to rise above this threshold temperature immediately, the rotation speed of fan 23 can be continuously increased, thereby continuously improving the cooling capacity of the air cooling structure.

[0118] Alternatively, as a fourth modification of the embodiment, the charging device 1 may perform control taking into account the charging efficiency. The charging efficiency is the ratio of the power received by the object to be charged 100 to the power transmitted from the coil 16.

[0119] For example, in the charging device 1, the controller 22 may increase the speed of the fan 23 if it detects, based on status information, that the charging efficiency is lower than a threshold efficiency. If the charging efficiency decreases due to, for example, a misalignment between the coil 116 and the coil 16, the device 100 sends a request to the charging device 1 to increase power to maintain the received power. In response, the charging device 1 increases the power it transmits, causing the temperature of the charging device 1 to rise, which in turn may also increase the temperature of the device 100. If the charging efficiency is lower than the threshold efficiency, it is expected that the temperature of the device 100 will exceed the threshold temperature for the temperature protection function, triggering the temperature protection function.

[0120] Alternatively, after increasing the speed of the fan 23, the controller 22 may detect based on the status information that the charging efficiency is higher than the threshold efficiency and then reduce the speed of the fan 23. When the charging efficiency is higher than the threshold efficiency, it is expected that the temperature of the object 100 will no longer be easily increased.

[0121] When stable, the controller 22 controls the rotation speed of the fan 23 to RN1. The controller 22 obtains status information related to the received power from the charged object 100. The controller 22 calculates the transmitted power using the voltage detected by the voltage detection circuit 14 and the current detected by the current detection circuit 15. The controller 22 determines the received power based on the status information. The controller 22 calculates the charging efficiency as the ratio of the received power to the transmitted power. The controller 22 compares the charging efficiency with a threshold efficiency. If the charging efficiency is lower than the threshold efficiency, the controller 22 increases the rotation speed of the fan 23 to RN2 (> RN1). Thus, when the charging efficiency deteriorates and the temperature of the charged object 100 is likely to rise, the cooling performance of the air cooling structure can be improved by increasing the rotation speed of the fan 23. In addition, by increasing the rotation speed of the fan 23, the user can be made aware of the decrease in charging efficiency.

[0122] After that, the controller 22 obtains state information related to the received power from the object to be charged 100. The controller 22 calculates the power transmission efficiency using the detected voltage and the detected current, determines the received power based on the state information, and calculates the charging efficiency using the power transmission efficiency and the received power. When the charging efficiency is higher than the threshold efficiency, the controller 22 reduces the rotation speed of the fan 23 to RN1 (<RN2). Thus, when the charging efficiency becomes high and it is possible that the temperature of the object to be charged 100 no longer easily rises, by reducing the rotation speed of the fan 23, it is possible to suppress the noise caused by the driving of the fan 23 and suppress the power consumption caused by the driving of the fan 23.

[0123] In addition, the controller 22 may also reduce the rotation speed of the fan 23 when it does not detect that the charging efficiency is higher than the threshold efficiency based on the state information within the time TM1 from when the rotation speed of the fan 23 is increased. The object to be charged 100 may not be appropriately disposed on the main surface 2a of the charging device 1 via the charging stand 19. For example, there is a convex portion on the back surface 100b of the object to be charged 100 (refer to Figure 1 ), and when the convex portion is disposed on the step of the charging stand 19, the distance in the Z direction between the coil 116 and the coil 16 becomes farther. In this case, it is anticipated that the charging efficiency is difficult to rise to the threshold efficiency.

[0124] The controller 22 controls the rotation speed of the fan 23 to RN1 during steady state. When the charging efficiency becomes lower than the threshold efficiency based on the state information, the controller 22 increases the rotation speed of the fan 23 to RN2 (>RN1). The controller 22 starts timing of the timer from when the rotation speed of the fan 23 is increased to RN2. When the charging efficiency does not exceed the threshold efficiency based on the state information until the elapsed time of the timer exceeds the time TM1, the controller 22 determines that the object to be charged 100 is not appropriately disposed, and thus reduces the rotation speed of the fan 23 to RN1. Thus, when the object to be charged 100 is not appropriately disposed, it is possible to prevent the rotation speed of the fan 23 from being continuously increased.

[0125] In this case, as Figure 8 shown, the charging device 1 may also perform operations different from those of the embodiment in the following aspects. Figure 8 It is a flowchart showing the operation of the charging device 1 according to the fourth modification of the embodiment.

[0126] After performing S1 to S5 in the same manner as the embodiment, if the object to be charged 100 is not in the fully charged state (No in S7), the charging device 1 calculates the charging efficiency based on the state information and determines whether the charging efficiency has decreased (S41).

[0127] If the charging efficiency is not lower than the threshold efficiency ("No" in S41), the charging device 1 considers that the charging efficiency has not decreased and the temperature of the object 100 is not likely to rise easily, and thus returns the process to S5 while maintaining the rotation speed of the fan 23.

[0128] If the charging efficiency falls below the threshold efficiency, the charging device 1 deems the charging efficiency to be decreased ("YES" in S41), indicating that the temperature of the device 100 is likely to rise. The charging device 1 increases the speed of the fan 23 (S9) and starts a timer. The charging device 1 maintains the fan 23 speed at RN2 (S10). After a predetermined period, the charging device 1 receives status information from the device 100. Based on this status information, the charging device 1 determines whether the charging efficiency has increased (S42).

[0129] If the charging efficiency is below the threshold efficiency, the charging device 1 determines that the charging efficiency has not increased ("No" in S42) and determines whether time TM1 has elapsed since the rotation speed of the fan 23 was increased (S12). The charging device 1 compares the timer's count with time TM1. If the timer's count does not exceed time TM1, the charging device 1 determines that time TM1 has not elapsed since the rotation speed of the fan 23 was increased ("No" in S12), and the process returns to S10. If the timer's count exceeds time TM1, the charging device 1 determines that time TM1 has elapsed since the rotation speed of the fan 23 was increased ("Yes" in S12), indicating that the object to be charged 100 is not properly positioned. The charging device 1 reduces the rotation speed of the fan 23 from RN2 to RN1 (S13), and the process returns to S5.

[0130] If the charging efficiency is greater than the threshold efficiency, the charging device 1 considers that the charging efficiency has increased ("Yes" in S42), and the temperature of the charged object 100 is not in a state where it is easy to increase, so the rotation speed of the fan 23 is reduced from RN2 to RN1 (S13), and the processing returns to S5.

[0131] As described above, in the fourth variation of the embodiment, controller 22 increases the speed of fan 23 when it detects, based on status information, that the charging efficiency is lower than a threshold efficiency. This increases the speed of fan 23, thereby improving the cooling performance of the air-cooling structure when charging efficiency deteriorates and the temperature of the charged object 100 is likely to rise. Furthermore, increasing the speed of fan 23 can alert the user to the decrease in charging efficiency.

[0132] Furthermore, in the fourth modified embodiment of the embodiment, if the controller 22 detects, based on status information, that the charging efficiency is higher than a threshold efficiency within a time period TM1 after increasing the speed of the fan 23, the controller 22 reduces the speed of the fan 23. Thus, when the charging efficiency increases and the temperature of the object 100 is no longer likely to rise, the speed of the fan 23 is reduced. This can suppress noise caused by the operation of the fan 23 and reduce power consumption caused by the operation of the fan 23.

[0133] In the fourth modified embodiment, the controller 22 reduces the speed of the fan 23 if the controller 22 does not detect that the charging efficiency is higher than the threshold efficiency within a time period TM1 after increasing the speed of the fan 23 based on the status information. This prevents the fan 23 from continuing to increase its speed if the object to be charged 100 is not properly positioned.

[0134] While several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other ways and can be omitted, replaced, or modified without departing from the spirit of the invention. These embodiments and their variations are intended to be included within the scope and spirit of the invention, as well as within the invention set forth in the claims and their equivalents.

Claims

1. A charging device comprising: a housing, wherein a charged object having a first coil can be disposed in the housing, the housing having an air intake port and an air exhaust port; a second coil disposed in the housing and capable of electromagnetically coupling with the first coil in the charged object; a fan disposed in a flow path from the air intake to the air exhaust; as well as A controller is configured to obtain status information related to received power from the object to be charged, and to control the rotation speed of the fan according to the status information.

2. The charging device according to claim 1, wherein: The controller increases the rotation speed of the fan when detecting a decrease in the power received by the charged object based on the status information.

3. The charging device according to claim 1, wherein: A temperature sensor is further provided, the temperature sensor being arranged in the housing and detecting the temperature. The controller maintains the rotation speed of the fan when a decrease in the received power of the charged object is detected based on the state information and the temperature detected by the temperature sensor is lower than a threshold value.

4. The charging device according to claim 2, wherein: The controller reduces the rotation speed of the fan if no increase in the received power of the charged object is detected based on the state information within a first time period after the rotation speed of the fan is increased.

5. The charging device according to claim 2, wherein: The controller reduces the rotation speed of the fan when detecting an increase in the power received by the charged object based on the state information after increasing the rotation speed of the fan.

6. The charging device according to claim 2, wherein: A temperature sensor is further provided, the temperature sensor being arranged in the housing and detecting the temperature. After increasing the rotation speed of the fan, the controller maintains the rotation speed of the fan when detecting an increase in the received power of the charged object based on the state information and the temperature detected by the temperature sensor is higher than a threshold.

7. The charging device according to claim 1, wherein: The controller increases the rotation speed of the fan when detecting, based on the status information, that the received power of the charged object is lower than the negotiated power at the start of charging.

8. The charging device according to claim 1, wherein: The controller increases the rotation speed of the fan when detecting, based on the state information, that a charging efficiency is lower than a threshold, wherein the charging efficiency is a ratio of power received by the object to power transmitted from the second coil.

9. The charging device according to claim 8, wherein: After increasing the rotation speed of the fan, the controller reduces the rotation speed of the fan when detecting, according to the state information, that the charging efficiency is higher than a threshold.

10. The charging device according to claim 8, wherein: The controller reduces the rotation speed of the fan if the controller does not detect, based on the state information, that the charging efficiency is higher than a threshold within a first time period after the rotation speed of the fan is increased.

11. A method for controlling a charging device, comprising: Acquiring status information related to a charging state from a charged object disposed in a housing of a charging device, wherein the charging device comprises: the housing, the charged object having a first coil capable of being disposed in the housing, the housing having an air intake port and an air exhaust port; a second coil disposed in the housing and capable of electromagnetically coupling with the first coil in the charged object; and a fan disposed in a flow path from the air intake port to the air exhaust port; and The rotation speed of the fan is controlled according to the status information.

12. A method for controlling a charging device, comprising: Power information related to charging power is obtained from a charged object in a housing configured in a charging device, wherein the charging device comprises: the housing, the charged object having a first coil can be configured in the housing, the housing having an air intake port and an air exhaust port; a second coil, which is configured in the housing and can be electromagnetically coupled to the first coil in the charged object; and a fan, which is configured in a flow path from the air intake port to the air exhaust port; and When it is detected based on the power information that the ratio of the power received by the charged object to the power transmitted from the second coil is lower than a threshold value, the rotation speed of the fan is increased.

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