Charging control device, charging control method and charging system for mobile device

Abstract

A charging control device, charging control method, and charging system for mobile devices. The charging control device is used to provide power supply to a first and a second mobile device, wherein the first and second mobile devices each include a mobile charging circuit and a battery. The charging control device includes a switching power conversion circuit for converting input power to generate supply power, and a conversion control circuit for controlling the switching power conversion circuit according to the following steps: S1: controlling the switching power conversion circuit to establish a current-voltage characteristic curve corresponding to the supply power; S2: determining the combination of charging modes of the first and second mobile devices based on the information indicated by the current-voltage characteristic curve and / or adjusting the supply voltage to charge the batteries in each mobile device, thereby reducing the voltage across each mobile charging circuit to reduce power loss.

Description

Technical Field

[0001] The present invention relates to a charging control device, and in particular to a charging control device for a mobile device. The present invention also relates to a charging control method for the mobile device, and a charging system including the charging control device and the mobile device. Background Art

[0002] Figure 1 A charging control device (101) for a mobile device of the prior art is shown, wherein the charging control device 101 is, for example, a charging box, and the mobile devices 30[1] and 30[2] are, for example, true wireless stereo headphones (TWS). The charging box 101 of the prior art includes a battery 11, a fuel gauge circuit 12, a microcontroller 13, and a buck-boost power conversion circuit 14'. The true wireless stereo headphones 30[1] and 30[2] each include a mobile charging circuit 31 and a battery 32, wherein the buck-boost power conversion circuit 14 converts the battery power provided by the battery 11 into a supply voltage VS, and the mobile charging circuits 31 of the true wireless stereo headphones 30[1] and 30[2] respectively convert the supply voltage VS into their respective corresponding charging power VC, thereby charging their respective batteries 32. Since the batteries 32 of the true wireless stereo earphones 30[1] and 30[2] may be in different power states, the charging box 101 of the prior art communicates with the power line transmission modules 33 corresponding to the true wireless stereo earphones 30[1] and 30[2] via power line transmission (PLC, powerline communication) through its power line transmission module 15 to obtain information such as the battery capacity, voltage or current of the earphones 30[1] and 30[2]. The charging box 101 then adjusts the supply voltage VS generated by the step-up / step-down power conversion circuit 14 according to the information such as the battery capacity, voltage or current of the earphones 30[1] and 30[2] to reduce the cross-voltage on the mobile charging circuit 31 corresponding to the earphones 30[1] and 30[2], thereby improving the power conversion efficiency, reducing heat generation, and improving the battery life of the battery box 101.

[0003] Figure 1 The disadvantage of the prior art charging control device is that both the battery box 101 and the earphones 30[1] and 30[2] require a power line transmission module. Therefore, the prior art charging control device occupies a large space, has a high cost, and consumes more power.

[0004] Compared to Figure 1 Compared with the prior art, the charging control device of the present invention does not require a power line transmission module, thereby saving space, reducing the size of the charging control device and the mobile device, and reducing costs and power consumption. Summary of the Invention

[0005] From one viewpoint, the present invention provides a charging control device for providing a supply power to a first mobile device and a second mobile device, wherein the first mobile device and the second mobile device each include: a mobile charging circuit and a first battery, wherein the mobile charging circuit corresponding to each mobile device converts the supply power to generate a corresponding charging power to charge the first battery corresponding to each mobile device, wherein each mobile charging circuit has at least two charging modes of a pre-charging mode, a constant current charging mode and a constant voltage charging mode, for charging the corresponding first battery; the charging control device includes: a switching power conversion circuit for converting an input power to generate the supply power, wherein the supply power has a supply voltage and a supply current; and a conversion control circuit for controlling the switching power conversion circuit; wherein the conversion control circuit controls the switching power conversion circuit according to the following steps: S1: controlling the switching power The conversion circuit gradually adjusts the level of the supply voltage within a preset voltage range and senses the corresponding level of the supply current, or gradually adjusts the level of the supply current within a preset current range and senses the corresponding level of the supply voltage, thereby establishing a current-voltage characteristic curve corresponding to the supply power source; and S2: based on whether the current-voltage characteristic curve has at least one mode turning point, and in the case that there is at least one mode turning point, performs one of the following operations according to the information indicated by the supply current and / or the supply voltage corresponding to the at least one mode turning point: S21: thereby determining the combination of charging modes of the first mobile device and the second mobile device; or S22: in the case that there is at least one mode turning point, adjusts the supply voltage according to the information of the supply voltage or the supply current corresponding to the at least one mode turning point to charge the first battery in each mobile device, thereby reducing the cross-voltage of each mobile charging circuit to reduce power loss.

[0006] In a preferred embodiment, step S21 includes: in the presence of at least one mode turning point, comparing a preset pre-charging current level with a preset constant current charging current level based on information indicated by the supply current corresponding to the at least one mode turning point, thereby determining the combination of charging modes of the first mobile device and the second mobile device.

[0007] In a preferred embodiment, in step S21, the information indicated by the supply voltage corresponding to at least one mode turning point of the current-voltage characteristic curve is also compared with a constant-voltage charging voltage threshold and a constant-current charging voltage threshold, thereby determining the combination of charging modes of the first mobile device and the second mobile device.

[0008] In a preferred embodiment, in step S21, the charging control device determines the mode of the first mobile device and the second mobile device according to the current-voltage characteristic curve through at least one of the following steps: S210: when the current-voltage characteristic curve does not have a mode turning point, or within the preset voltage range, the corresponding supply current is lower than the preset pre-charge current level, it is determined that they are in mode combination 0: wherein the first mobile device and the second mobile device are both in the stop charging mode; S211: when the current-voltage characteristic curve has one and only mode turning point, and after the supply voltage exceeds the mode turning point, the corresponding supply current level is equal to the preset pre-charge current level, it is determined that they are in mode combination 0; Combination 1: wherein one of the first mobile device and the second mobile device is in the pre-charging mode, and the other one is in the stop charging mode; S212: when the current-voltage characteristic curve has one and only mode turning point, and the supply voltage exceeds the mode turning point, the corresponding supply current level is greater than the preset pre-charging current level and less than the constant current charging current level, it is determined to be in mode combination 2: wherein one of the first mobile device and the second mobile device is in the constant voltage charging mode, and the other one is in the stop charging mode; S213: when the current-voltage characteristic curve has one and only mode turning point, and the supply voltage exceeds the mode turning point, the corresponding supply current level is greater than the preset pre-charging current level and less than the constant current charging current level. When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is equal to 2 times the preset pre-charge current level, it is determined to be in mode combination 4: wherein the first mobile device and the second mobile device are both in the pre-charge mode; S215: when the current-voltage characteristic curve has multiple mode turning points, and the supply current corresponding to the highest of the supply voltages corresponding to the multiple mode turning points is equal to 2 times the preset pre-charge current level, it is determined to be in mode combination 3: wherein one of the first mobile device and the second mobile device is in the constant current charging mode, and the other is in the stop charging mode; S214: when the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is equal to 2 times the preset pre-charge current level, it is determined to be in mode combination 4: wherein the first mobile device and the second mobile device are both in the pre-charge mode; S215: when the current-voltage characteristic curve has multiple mode turning points, and the supply current corresponding to the highest of the supply voltages corresponding to the multiple mode turning points is equal to 2 times the preset pre-charge current level When the corresponding supply current is greater than twice the preset pre-charge current level and less than the sum of the preset constant-current charging current level and the preset pre-charge current level, it is determined that the device is in mode combination 5: one of the first mobile device and the second mobile device is in the constant-voltage charging mode, and the other of the first mobile device and the second mobile device is in the pre-charge mode; S216: When the current-voltage characteristic curve has at least one mode inflection point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode inflection point is greater than twice the preset pre-charge current level and less than twice the constant-current charging current level, it is determined that the device is in mode combination 6: both the first mobile device and the second mobile device are in the constant-voltage charging mode;S217: When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is equal to the sum of the preset constant-current charging current level and the preset pre-charging current level, it is determined that the device is in mode combination 7: wherein one of the first mobile device and the second mobile device is in the constant-current charging mode, and the other is in the pre-charging mode; S218: When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is greater than the preset constant-current charging current level, When the sum of the constant-current charging current level and the preset pre-charging current level is less than twice the constant-current charging current level, it is determined that the device is in mode combination 8: one of the first mobile device and the second mobile device is in the constant-current charging mode, and the other is in the constant-voltage charging mode; and / or S219: when the current-voltage characteristic curve has at least one mode inflection point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode inflection point is equal to twice the preset constant-current charging current level, it is determined that the device is in mode combination 9: both the first mobile device and the second mobile device are in the constant-current charging mode.

[0009] In a preferred embodiment, when the charging control device determines the mode of the first mobile device and the second mobile device according to at least one of steps S212, S215, S216 or S218, each step further includes the following corresponding operations: Step S212 also includes: when the supply voltage corresponding to the mode turning point is greater than or equal to the constant voltage charging voltage threshold, it is determined that the first mobile device and the second mobile device are in the mode combination 2; Step S215 also includes: when the highest of the supply voltages corresponding to the multiple mode turning points is greater than or equal to the constant voltage charging voltage threshold, and the voltage level of the lowest one is less than the constant current charging voltage threshold, The first mobile device and the second mobile device are judged to be in mode combination 5 only when the supply voltages corresponding to the at least one mode turning point are greater than or equal to the constant-voltage charging voltage threshold; step S216 also includes: the first mobile device and the second mobile device are judged to be in mode combination 6 only when the supply voltages corresponding to the at least one mode turning point are greater than or equal to the constant-voltage charging voltage threshold; and / or step S218 also includes: the first mobile device and the second mobile device are judged to be in mode combination 8 only when the highest of the supply voltages corresponding to the at least one mode turning point is greater than the constant-voltage charging voltage threshold and the voltage level of the lowest of the supply voltages is less than the constant-voltage charging voltage threshold and greater than or equal to the constant-current charging voltage threshold.

[0010] In a preferred embodiment, in the case of step S21, the conversion control circuit further controls the switching power conversion circuit according to the following steps: S3: adjusting the supply voltage to charge the first battery in each of the mobile devices based on the combination of the charging modes of the first mobile device and the second mobile device and the information indicated by the at least one mode turning point, thereby reducing the cross-voltage of each of the mobile charging circuits to reduce power loss.

[0011] In a preferred embodiment, step S3 includes the following steps: S31: When the first mobile device and the second mobile device are in mode combination 1, 2 or 3, the supply voltage level is determined based on the supply voltage corresponding to the one and only mode turning point to charge the first battery in each mobile device, thereby increasing the charging speed and reducing the voltage across each mobile charging circuit to reduce power loss.

[0012] In a preferred embodiment, step S3 includes one of the following steps: S32: when the first mobile device and the second mobile device are in mode combinations 4 to 9, in a power saving power supply mode, determining the level of the supply voltage according to the lowest of the supply voltages corresponding to the at least one mode turning point to charge the first battery in each mobile device, thereby reducing the cross-voltage of each mobile charging circuit to reduce power loss; S33: when the first mobile device and the second mobile device are in mode combinations 4 to 9, in a fast charging power supply mode, determining the level of the supply voltage according to the lowest of the supply voltages corresponding to the at least one mode turning point to charge the first battery in each mobile device. The supply voltage level is determined based on the highest of the supply voltages corresponding to the at least one mode turning point to charge the first battery in each of the mobile devices, thereby increasing the charging speed and reducing the voltage across the mobile charging circuit to reduce power loss; or S34: when the first mobile device and the second mobile device are in mode combinations 4 to 9, in a balanced power supply mode, the supply voltage level is adjusted to be between the highest and the lowest of the supply voltages corresponding to the at least one mode turning point to charge the first battery in each of the mobile devices, thereby balancing the charging speed and power loss.

[0013] In a preferred embodiment, step S22 includes one of the following steps: S221: in a power saving power supply mode, determining the level of the supply voltage according to the lowest one of the supply voltages corresponding to the at least one mode turning point to charge the first battery in each of the mobile devices, thereby reducing the cross-voltage of each of the mobile charging circuits to reduce power loss; S222: in a fast charging power supply mode, determining the level of the supply voltage according to the highest one of the supply voltages corresponding to the at least one mode turning point to charge the first battery in each of the mobile devices, thereby increasing the charging speed and reducing the cross-voltage of each of the mobile charging circuits to reduce power loss; or S223: in a balanced power supply mode, adjusting the level of the supply voltage so that it is between the highest and the lowest one of the supply voltages corresponding to the at least one mode turning point to charge the first battery in each of the mobile devices, thereby balancing the charging speed and power loss.

[0014] In a preferred embodiment, after step S22, the conversion control circuit further controls the switching power conversion circuit according to the following steps: S4: when sensing and determining that the supply current drops by a preset current difference, the supply voltage level is increased by a preset voltage difference to continue charging the first battery in each mobile device, and the process is repeated until charging is completed.

[0015] In a preferred embodiment, after step S22, the conversion control circuit further controls the switching power conversion circuit according to the following steps: S5: After a preset charging period, return to step S1.

[0016] In a preferred embodiment, after step S3, the conversion control circuit further controls the switching power conversion circuit according to the following steps: S4: when sensing and determining that the supply current drops by a preset current difference, the supply voltage level is increased by a preset voltage difference to continue charging the first battery in each mobile device, and repeated until charging is completed.

[0017] In a preferred embodiment, after step S3, the conversion control circuit further controls the switching power conversion circuit according to the following steps: S5: After a preset charging period, return to step S1 and repeat until charging is completed.

[0018] In a preferred embodiment, the charging control device further includes: a fuel gauge circuit coupled to the conversion control circuit and a second battery for providing the input power, for sensing the current of the second battery to record its charge level when the second battery is charging or discharging, wherein the current of the second battery corresponds to the supply current when the supply power is provided to the first mobile device and the second mobile device.

[0019] In a preferred embodiment, the charging control device further includes the second battery.

[0020] In a preferred embodiment, in step S1 , the second battery stops being charged.

[0021] In a preferred embodiment, the mobile charging circuit is configured as a linear charging circuit.

[0022] In a preferred embodiment, when it is determined that the mode combination is 0, the charging control device stops providing the supply power.

[0023] From another perspective, the present invention also provides a charging control method for providing a power supply to a first mobile device and a second mobile device, wherein the first mobile device and the second mobile device each include: a mobile charging circuit and a first battery, wherein the mobile charging circuit corresponding to each mobile device converts the power supply to generate a corresponding charging power supply to charge the first battery corresponding to each mobile device, wherein each mobile charging circuit has at least two charging modes of a pre-charging mode, a constant current charging mode and a constant voltage charging mode, for charging the corresponding first battery; the charging control method includes: S1: gradually adjusting the level of the supply voltage within a preset voltage range and sensing the corresponding level of the supply current, or gradually adjusting the level of the supply current within a preset current range. The level of the supply current and the corresponding level of the supply voltage are sensed, thereby establishing a current-voltage characteristic curve corresponding to the supply power source; and S2: based on whether the current-voltage characteristic curve has at least one mode turning point, and in the case that there is at least one mode turning point, one of the following operations is performed according to the information indicated by the supply current and / or the supply voltage corresponding to the at least one mode turning point: S21: thereby determining the combination of charging modes of the first mobile device and the second mobile device; or S22: in the case that there is at least one mode turning point, the supply voltage is adjusted according to the information of the supply voltage or the supply current corresponding to the at least one mode turning point to charge the first battery in each of the mobile devices, thereby reducing the cross-voltage of each of the mobile charging circuits to reduce power loss.

[0024] From another perspective, the present invention also provides a charging system, comprising: a plurality of mobile devices, the plurality of mobile devices including a first mobile device and a second mobile device, wherein the plurality of mobile devices each include: a mobile charging circuit; and a first battery, wherein the mobile charging circuit corresponding to each mobile device converts a supply power source to generate a corresponding charging power source to charge the first battery corresponding to each mobile device, wherein each mobile charging circuit has at least two charging modes of a pre-charging mode, a constant current charging mode and a constant voltage charging mode, for charging the corresponding first battery; and a charging control device, removably coupled to the plurality of mobile devices, for providing the supply power source to the first mobile device and the second mobile device, the charging control device including: a switching power conversion circuit, for converting an input power source to generate the supply power source, wherein the supply power source has a supply voltage and a supply current; and a conversion control circuit, for controlling the switching power conversion circuit; wherein the conversion control circuit is configured to control the switching power conversion circuit according to The following steps control the switching power conversion circuit: S1: controlling the switching power conversion circuit to gradually adjust the level of the supply voltage within a preset voltage range and sense the corresponding level of the supply current, or gradually adjust the level of the supply current within a preset current range and sense the corresponding level of the supply voltage, thereby establishing a current-voltage characteristic curve corresponding to the supply power; and S2: performing one of the following operations based on whether the current-voltage characteristic curve has at least one mode turning point, and in the case that there is at least one mode turning point, performing one of the following operations based on the information indicated by the supply current and / or the supply voltage corresponding to the at least one mode turning point: S21: thereby determining the combination of charging modes of the first mobile device and the second mobile device; or S22: in the case that there is at least one mode turning point, adjusting the supply voltage based on the information of the supply voltage or the supply current corresponding to the at least one mode turning point to charge the first battery in each of the mobile devices, thereby reducing the cross-voltage of each of the mobile charging circuits to reduce power loss.

[0025] The following detailed description through specific embodiments will make it easier to understand the purpose, technical content, characteristics and effects achieved by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A block diagram of an embodiment of a conventional charging control device for a mobile device is shown.

[0027] Figure 2 A block diagram showing an embodiment of the charging system and charging control device of the present invention.

[0028] Figure 3A block diagram showing another embodiment of the charging system and charging control device of the present invention.

[0029] Figure 4 The current-voltage characteristic curve of an embodiment of a mobile charging circuit charging a battery in a charging control device according to the present invention is shown.

[0030] Figures 5A to 5C The current-voltage characteristic curves of several embodiments of the mobile charging circuit in the charging control device of the present invention are shown, showing supply current IS versus supply voltage VS when charging different batteries in several charging modes.

[0031] Figure 6A 、 Figure 7A 、 Figure 8A 、 Figure 9A 、 Figure 10A The current-voltage characteristic curves of the power supply of the charging control device of the present invention are shown for two mobile devices in various charging mode combinations according to several embodiments.

[0032] Figure 6B 、 Figure 7B 、 Figure 8B 、 Figure 9B 、 Figure 10B The display corresponds to Figure 6A 、 Figure 7A 、 Figure 8A 、 Figure 9A 、 Figure 10A When power is supplied to two mobile devices simultaneously under the mode combination, current-voltage characteristic curves of the power supply of several embodiments under the corresponding charging mode combination are shown.

[0033] Figure 11 The information indicating the mode turning point in the charging control device of the present invention corresponds to a list of combinations of charging modes of the two mobile devices.

[0034] Figures 12A to 12C Several embodiments of flowcharts showing how a charging control device according to the present invention controls a switching power conversion circuit are shown.

[0035] Figure 13 A current operation waveform diagram corresponding to an embodiment of the present invention is shown, for example.

[0036] Figure 14A A more specific embodiment of a flowchart showing a conversion control circuit for controlling a switching power conversion circuit according to the present invention is shown.

[0037] Figure 14B A more specific embodiment of a flowchart showing a conversion control circuit for controlling a switching power conversion circuit according to the present invention is shown.

[0038] Figure 14C A specific embodiment of a flowchart showing a conversion control circuit for controlling a switching power conversion circuit according to the present invention is shown.

[0039] Figure 15 A flowchart showing a specific embodiment of a charging control device according to the present invention controlling a switching power conversion circuit to charge a mobile device.

[0040] Figures 16A and 16B A flowchart showing a specific embodiment of a charging control device according to the present invention controlling a switching power conversion circuit to charge a mobile device.

[0041] Figure 17 A flow chart showing a more specific embodiment of a charging control device according to the present invention controlling a switching power conversion circuit to charge a mobile device.

[0042] Explanation of symbols in the figure

[0043] 11: Battery

[0044] 12: Fuel gauge circuit

[0045] 13: Microcontroller

[0046] 14': Buck-boost power conversion circuit

[0047] 14: Switching power conversion circuit

[0048] 16: Conversion control circuit

[0049] 15, 33: Power line transmission module

[0050] 101, 102, 103: Charging control device

[0051] 1002, 1003: Charging system

[0052] 30[1], 30[2], 50[1], 50[2]: Mobile devices

[0053] 31, 51: Mobile charging circuit

[0054] 32, 52: Battery

[0055] I_CC, I_CV, I_PC: current levels

[0056] Ich: charging current

[0057] IS, IS[1], IS[2]: supply current

[0058] I_stp: current difference

[0059] Rcs: sensing resistor

[0060] S0, S1~S5, S8~S10, S21~S22, S220~S223, S31~S34: Steps

[0061] S30a~S30b,S41~S42:Steps

[0062] T1~T4: Time point

[0063] T_stp: Charging period

[0064] Vch: charging voltage

[0065] Vin: input power

[0066] V_CV, V_PC: voltage

[0067] VS, VS[1], VS[2]: supply voltage

[0068] V_stp: voltage difference DETAILED DESCRIPTION

[0069] The drawings in the present invention are schematic diagrams, mainly intended to illustrate the coupling relationship between various circuits and the relationship between various signal waveforms. The circuits, signal waveforms and frequencies are not drawn according to scale.

[0070] Figure 2 A block diagram of an embodiment of the charging system (charging system 1002) and the charging control device of the present invention (charging control device 102) is shown. In one embodiment, the charging control device 102 is, for example, a charging box, and the mobile devices 50[1] and 50[2] are, for example, true wireless stereo headphones (TWS). In one embodiment, the charging control device 102 includes a conversion control circuit 16 and a switching power conversion circuit 14, and the mobile devices 50[1] and 50[2] each include a mobile charging circuit 51 and a battery 52.

[0071] In one embodiment, the switching power conversion circuit 14 can be configured as, for example, a buck-boost power conversion circuit. The switching power conversion circuit 14 converts the input power Vin into a supply power (including a supply voltage VS and a supply current IS). The conversion control circuit 16 is used to control the switching power conversion circuit 14. The mobile charging circuits 51 of the mobile devices 50[1] and 50[2] then convert the supply power into their respective corresponding charging power (including a charging voltage Vch and a charging current Ich), thereby charging their respective batteries 52.

[0072] The switching power converter circuit 14 can be configured as, for example, a buck-boost power converter circuit, a step-down power converter circuit, a boost power converter circuit, or other types of switching power converter circuits. In one embodiment, the mobile charging circuit 51 can be configured as a linear charging circuit, but the present invention is not limited thereto. In other embodiments, the mobile charging circuit 51 can also be configured as a switching charging circuit. When the mobile charging circuit 51 is configured as a linear charging circuit, the energy loss of the mobile device is positively correlated with the voltage across the mobile charging circuit 51. In this case, the effectiveness of the present invention is particularly demonstrated.

[0073] Figure 3 A block diagram of another embodiment of the charging system (charging system 1003) and the charging control device of the present invention (charging control device 103) is shown. The charging control device 103 is similar to the charging control device 102. In this embodiment, the charging control device 103 further includes a fuel gauge circuit 12. In this embodiment, the battery 11 is used to provide the aforementioned input power to the switching power conversion circuit 14. In addition, the battery 11 receives an external power supply to be charged. The fuel gauge circuit 12 is coupled to the battery 11 and the conversion control circuit 16, and is used to sense the current of the battery 11 through the sensing resistor Rcs to record its power when the charging control device 103 controls the charging or discharging of the battery 11. When the supply power is provided to the mobile devices 50[1] and 50[2] without receiving charging, the current flowing out of the battery 11 corresponds to the supply current IS. In other words, in this case, when establishing the current-voltage characteristic curve of the aforementioned supply power, the charging control device 103 can obtain the supply current IS by measuring through the fuel gauge circuit 12.

[0074] In one embodiment, the aforementioned Figure 2 or Figure 3 The charging control device 102 or 103 (excluding the battery) can be integrated into an integrated circuit.

[0075] Please continue reading Figure 3 In one embodiment, the charging control device 103 further includes the aforementioned battery 11 . In this case, the charging control device 103 may correspond to a charging box having a rechargeable battery 11 , for example.

[0076] Figure 4 The current-voltage characteristic curves of a mobile charging circuit in a charging control device according to the present invention are shown. In a typical embodiment, each mobile charging circuit 51 corresponding to each mobile device has at least two charging modes: a pre-charging mode, a constant-current charging mode, and a constant-voltage charging mode, for charging its corresponding battery 52.

[0077] The mobile charging circuit 51 will determine which charging mode to use based on the status of the battery 52. Figure 4 As shown, in one embodiment, when the voltage of the battery 52 is greater than V_PC and less than V_CV, the mobile charging circuit 51 enters a constant current charging mode, where the mobile charging circuit 51 outputs a constant charging current Ich, such as a current level I_CC, to charge the battery 52. ​​When the voltage of the battery 52 reaches V_CV, the mobile charging circuit 51 enters a constant voltage charging mode, where the mobile charging circuit 51 continuously charges the battery 52 at a constant charging voltage Vch, such as a voltage level V_CV. When the voltage of the battery 52 is less than V_PC, the mobile charging circuit 51 enters a pre-charging mode, where the mobile charging circuit 51 outputs a constant charging current Ich, such as a current level I_PC, to charge the battery 52. ​​Generally, the current level I_PC is less than the current level I_CC, and may be, for example, but not limited to, 1 / 10.

[0078] Figure 5A The current-voltage characteristic curves of several embodiments of the supply current IS versus supply voltage VS are shown when the mobile charging circuit in the charging control device of the present invention charges different batteries (such as but not limited to batteries with different charge states) in the aforementioned charging modes. Figure 5A As shown, when the supply voltage VS is too low, the mobile charging circuit 51 cannot operate normally, so the supply current IS is zero. When the supply voltage VS is high enough, the mobile charging circuit 51 starts to provide current to the battery 52, and the supply current IS increases as the supply voltage VS increases. Then, at the mode turning point, the mobile charging circuit 51 starts to charge the battery 52 with a constant charging current Ich at a current level of I_PC. At the same time, the current level of the supply current IS is also approximately I_PC and no longer increases as the supply voltage VS increases. It is worth noting that when the mobile charging circuit operates in the pre-charge mode, the supply voltage VS corresponding to the mode turning point is relatively low. Specifically, Figure 5A For example, in this embodiment, the supply voltages VS[1] and VS[2] corresponding to the mode turning points in the pre-charging mode are both close to 2.9V, where VS[1] and VS[2] correspond to different mobile charging circuits and / or different batteries.

[0079] Figure 5B The current-voltage characteristic curves of several embodiments of the mobile charging circuit in the charging control device of the present invention, when charging different batteries in the constant current charging mode, are shown. Figure 5BAs shown, when the supply voltage VS is too low, the mobile charging circuit 51 still cannot operate normally, so the supply current IS is 0. When the supply voltage VS is high enough, the mobile charging circuit 51 starts to provide current to the battery 52, and the supply current IS increases as the supply voltage VS increases. Then, at the mode turning point, the mobile charging circuit 51 starts to charge the battery 52 with a constant charging current Ich of current level I_CC. At the same time, the current level of the supply current IS is also roughly equal to the charging current Ich, and no longer increases with the supply voltage VS. It is worth noting that when the mobile charging circuit operates in the constant current charging mode, the supply voltage VS corresponding to the mode turning point is slightly higher, specifically Figure 5B For example, the supply voltages (VS[1], VS[2]) corresponding to the mode turning points in the constant current charging mode (corresponding to different mobile charging circuits and / or different batteries) all exceed the constant current charging voltage threshold Vthcc, but do not exceed the constant voltage (CV) voltage threshold Vthcv. In addition, due to the different battery voltages in this embodiment, the supply voltages VS[1], VS[2] corresponding to the mode turning points also vary, but are both between the constant current charging voltage threshold Vthcc and the constant voltage charging voltage threshold Vthcv.

[0080] Figure 5C The current-voltage characteristic curves of several embodiments of the mobile charging circuit in the charging control device of the present invention, when charging different batteries in the constant voltage charging mode, are shown. Figure 5C As shown, when the supply voltage VS is too low, the mobile charging circuit 51 still cannot operate normally, so the supply current IS is 0. When the supply voltage VS is high enough, the mobile charging circuit 51 begins to provide current to the battery 52, and the supply current IS increases as the supply voltage VS increases. Then, at the mode turning point, the mobile charging circuit 51 begins to charge the battery 52 with a charging current between I_PC and I_CC (corresponding to I_CV). At the same time, the current level of the supply current IS is also roughly a constant value that does not change for a short period of time and no longer increases with the supply voltage VS. It is worth noting that when the mobile charging circuit operates in the constant voltage charging mode, the supply voltage VS corresponding to the mode turning point is relatively high and almost a fixed value. Figure 5CFor example, the supply voltages (VS[1], VS[2]) corresponding to the mode turning points in the constant voltage charging mode (corresponding to different mobile charging circuits and / or different batteries) all exceed the constant voltage (CV) voltage threshold Vthcv. In this embodiment, the supply voltages VS[1], VS[2] corresponding to the mode turning points in the constant voltage charging mode are both close to 4.2V. In addition, due to the different battery capacities in this embodiment, the supply currents IS[1], IS[2] corresponding to the mode turning points are also different, but are both between the aforementioned I_PC and I_CC.

[0081] It should be noted that the above Figures 5A to 5C The current-voltage characteristic curves are obtained by scanning the current-voltage characteristic curves of different single mobile devices (i.e., a single mobile charging circuit charging a single battery), and completing the above scans in a sufficiently short time to avoid significantly changing the battery level in the mobile device. Furthermore, in the above embodiments, the current-voltage characteristic curves can be obtained by measuring the supply current by controlling the change in the supply voltage, or by measuring the supply voltage by controlling the change in the supply current.

[0082] In addition, it should be noted that the above-mentioned mode turning point refers to the current-voltage characteristic curve. Figures 5A to 5C Under the coordinate axis arrangement, the turning point when the supply current IS changes from a positive slope to a zero slope, the same below.

[0083] In a specific mobile device, the judgment voltage threshold between the pre-charging mode and the constant current charging mode corresponds to the aforementioned constant current charging voltage threshold Vthcc, and the judgment voltage threshold between the constant current charging mode and the constant voltage charging mode corresponds to the aforementioned constant voltage charging voltage threshold Vthcv.

[0084] Figure 6A 、 Figure 7A 、 Figure 8A 、 Figure 9A 、 Figure 10A The current-voltage characteristic curves of the power supply of the two mobile devices (50[1] and 50[2]) in the charging control device of the present invention are shown in several embodiments under various charging mode combinations. Figure 6B 、 Figure 7B 、 8B 、 Figure 9B 、 Figure 10B The display corresponds to Figure 6A 、 Figure 7A 、 Figure 8A 、 Figure 9A 、 Figure 10AWhen the power supply is supplied to two mobile devices (50[1] and 50[2]) at the same time under the mode combination, the current-voltage characteristic curves of the power supply of several embodiments under the corresponding charging mode combination are shown.

[0085] In one embodiment, if Figure 6A As shown, both mobile devices 50[1] and 50[2] are in constant current charging mode. When power is supplied to both mobile devices 50[1] and 50[2] at the same time, the current-voltage characteristic curve of the power supply is as follows: Figure 6B As shown, in one embodiment, as Figure 6B The current-voltage characteristic curve has two mode turning points, wherein the supply voltage VS and supply current IS corresponding to the first mode turning point are 3.5V and I_CC respectively, and the supply voltage VS and supply current IS corresponding to the second mode turning point are 3.9V and 2*I_CC respectively. When both mobile devices 50[1] and 50[2] are in the constant current charging mode, there may be only one mode turning point, for example, when the mode turning points of mobile devices 50[1] and 50[2] overlap.

[0086] Figure 7A and Figure 7B In the embodiment, the mobile devices 50[1] and 50[2] are in the pre-charging mode and the constant current charging mode respectively. Figure 7B The current-voltage characteristic curve has two mode turning points. The supply voltage VS and supply current IS corresponding to the first mode turning point are 2.9V and I_PC respectively, and the supply voltage VS and supply current IS corresponding to the second mode turning point are 3.9V and I_PC+I_CC respectively.

[0087] Figure 8A and Figure 8B In the embodiment, the mobile devices 50[1] and 50[2] are in a constant current charging mode and a constant voltage charging mode respectively. Figure 8B The current-voltage characteristic curve has two mode turning points. The supply voltage VS and supply current IS corresponding to the first mode turning point are 3.9V and I_CC respectively, while the supply voltage VS and supply current IS corresponding to the second mode turning point are 4.2V and I_CC+I_CV respectively, where I_CV is the current level between I_PC and I_CC.

[0088] Figure 9A and Figure 9B In the embodiment, the mobile devices 50[1] and 50[2] are in a constant current charging mode and a stop charging mode respectively. Figure 9BThe current-voltage characteristic curve of the MOSFET has a unique mode turning point, wherein the supply voltage VS and supply current IS corresponding to the unique mode turning point are, for example, 3.9V and I_CC.

[0089] Figure 10A and Figure 10B In the embodiment, both mobile devices 50[1] and 50[2] are in the stop charging mode. Figure 10B There is no mode turning point in the current-voltage characteristic curve. On the other hand, within the sweep voltage range of the supply voltage VS, as shown in Figure 10B As shown, the supply current IS is 0.

[0090] It should be noted that the 2.9V in the above embodiment is merely an example, which corresponds to the aforementioned pre-charge mode turning point voltage V_PC, wherein the pre-charge mode turning point voltage V_PC is lower than the constant-current charging voltage threshold Vthcc; the 4.2V in the above embodiment is merely an example, which corresponds to the aforementioned constant-voltage charging mode turning point voltage V_CV, wherein the constant-voltage mode turning point voltage V_CV is higher than the constant-voltage charging voltage threshold Vthcv; the 3.9V in the above embodiment is merely an example, which corresponds to the aforementioned constant-current charging mode turning point voltage V_CC, wherein the constant-current charging mode turning point voltage V_CC is between the aforementioned constant-current charging voltage threshold Vthcc and the constant-voltage charging voltage threshold Vthcv.

[0091] In addition, in addition to providing the charging current Ich, the supply current IS also needs to provide a portion of the operating current to the circuits (e.g., the mobile charging circuit 51) within the mobile device (50[1], 50[2]) for operation. Therefore, in one embodiment, the aforementioned I_PC, I_CC, I_CV, and 0 current of the supply current IS have all been subtracted from the aforementioned operating current.

[0092] By the aforementioned Figures 6A to 10A as well as Figures 6B to 10B As can be seen from the corresponding description, when power is simultaneously supplied to multiple mobile devices, the current-voltage characteristic curve of the supplied power is actually a superposition of multiple corresponding current-voltage characteristic curves when power is supplied to individual mobile devices. Therefore, according to the present invention, the charging control device can determine the combination of charging modes for multiple mobile devices based on whether a mode turning point exists in the current-voltage characteristic curve of the supplied power, the level of the supply current IS at the mode turning point in the current-voltage characteristic curve, and / or the level of the supply voltage VS.

[0093] Figure 11 The information indicating the mode turning point in the charging control device of the present invention corresponds to a list of combinations of charging modes of two mobile devices. The above embodiments are only examples. Figure 11As shown, when the charging control device (such as 102) provides power to two mobile devices (such as 50[1], 50[2]), the current-voltage characteristic curve of the power supply, the corresponding relationship between the information of the mode turning point and the combination of the charging mode has at least the following characteristics: Figure 11 There are 10 possible pattern combinations shown (pattern combinations 0 to 9).

[0094] The following is Figure 11 In the mobile device charging mode combination column, NC means the mobile device is in stop charging mode, PC means the mobile device is in pre-charging mode, CC means the mobile device is in constant current charging mode, and CV means the mobile device is in constant voltage charging mode. The supply voltage and current corresponding to the first mode turning point of the current-voltage characteristic curve of the power supply are VS[1] and IS[1] respectively, and the supply voltage and current corresponding to the second mode turning point are VS[2] and IS[2] respectively. When the aforementioned mode turning points are not included, Figure 11 In the table, it is marked as "none", such as shown in mode combination 0. Specifically, Figure 11 As shown, in one embodiment, the combination of charging modes of mobile devices 50[1] and 50[2] can be determined based on whether a first mode turning point and / or a second mode turning point exist, and when at least a first mode turning point exists, the level or range of the corresponding supply current IS[1] and / or IS[2] at or after the mode turning point. For example, if the supply current IS[1] of the first mode turning point corresponding to mode combination 3 is I_CC, and there is no second mode turning point, and if the supply current IS[1] of the mode turning point corresponding to mode combination 5 is I_PC, and IS[2] is between 2*I_PC and I_CC+I_PC. In one embodiment, the combination of charging modes of mobile devices 50[1] and 50[2] can also be determined based on the level or range of the supply voltage VS[1] and / or VS[2] corresponding to the mode turning point.

[0095] For example, when the pre-charge mode (PC) is present (e.g., mode combination 4), the supply voltage VS[1] corresponding to the first mode turning point is less than the constant current charging voltage threshold Vthcc. For another example, in mode combination 8, the supply voltage VS[1] corresponding to the first mode turning point is between the constant current charging voltage threshold Vthcc and the constant voltage charging voltage threshold Vthcv, corresponding to the constant current charging mode (CC), while the supply voltage VS[2] corresponding to the second mode turning point is greater than the constant voltage charging voltage threshold Vthcv, corresponding to the constant voltage charging mode (CV). The remaining mode combinations are similar and are not described in detail here.

[0096] Figures 12A and 12BSeveral embodiments of flowcharts showing how a charging control device according to the present invention controls a switching power conversion circuit are shown.

[0097] First, in step S1, as described above, a current-voltage characteristic curve of the supply power is established when supplying multiple mobile devices (such as mobile devices 50[1], 50[2]) at the same time. Specifically, the switching power conversion circuit (such as the switching power conversion circuit 14) can be controlled to gradually adjust the level of the supply voltage VS within a preset voltage range and sense the corresponding level of the supply current IS, or the level of the supply current IS can be gradually adjusted within a preset current range and sense the corresponding level of the supply voltage VS, thereby establishing a current-voltage characteristic curve corresponding to the supply power.

[0098] like Figure 12A As shown, step S2 is then performed: according to whether the current-voltage characteristic curve established in step S1 has at least one mode turning point, and if at least one mode turning point exists, one of step S21 or step S22 is performed according to information indicated by the supply voltage VS or the supply current IS corresponding to the at least one mode turning point:

[0099] Step S21: thereby determining the combination of charging modes of the mobile device 50[1] and the mobile device 50[2]; or

[0100] Step S22 : When at least one mode turning point exists, adjust the supply voltage VS according to information of the supply voltage VS or supply current IS corresponding to the at least one mode turning point to charge the battery 52 in each mobile device, thereby reducing the voltage across each mobile charging circuit 51 to reduce power loss.

[0101] Please also read back Figure 3 In an embodiment where the charging control device (such as 103) has a battery 11 and uses a fuel gauge circuit 12 to measure the supply current IS, when the charging control device establishes a current-voltage characteristic curve in step S1 and uses the fuel gauge circuit 12 to measure the supply current IS, the battery 11 of the charging control device 103 stops receiving charging. In this case, the current measured by the fuel gauge circuit 12 can correspond to the supply current IS.

[0102] Figure 12B A flowchart showing an embodiment of a charging control device according to the present invention controlling a switching power conversion circuit to charge a mobile device. Figure 12A Similar to the embodiment, Figure 12B In the embodiment, the conversion control circuit 16 further performs the following steps after step S21 to control the switching power conversion circuit 14:

[0103] Step S3: Adjust the supply voltage VS based on the combination of the charging modes of the mobile device 50[1] and the mobile device 50[2] and the information indicated by the at least one mode turning point to simultaneously charge the batteries 52 in each mobile device, thereby reducing the voltage across each mobile charging circuit 51 to reduce power loss.

[0104] Please also see Figure 6B 、 Figure 12B and Figure 13 , Figure 13 Displays, for example, Figure 6B 、 Figure 12B In one embodiment, as shown in FIG. Figure 12B As shown, after step S3, the conversion control circuit 16 further controls the switching power conversion circuit 14 according to the following steps:

[0105] Step S4: When the supply current IS is sensed and determined to drop by a predetermined current difference I_stp (S41), the supply voltage VS is increased by a predetermined voltage difference V_stp to continue charging the battery 52 in each mobile device (S42), and the process is repeated until charging is completed (steps S8-S10).

[0106] Specifically Figure 13 For example, in step S3, the supply voltage VS is adjusted to, for example, 3.5V (e.g. Figure 13 The time point T1 corresponds to Figure 6B The first mode turning point) is reached to start charging the batteries 52 in each mobile device at the same time. At this time, the supply current is I_CC. The charge and voltage of the batteries 52 of the mobile devices 50[1] and / or 50[2] increase with the charging time, while the supply current I_CC (corresponding to the charging current Ich) decreases accordingly. This is because the voltage of the batteries 52 of the mobile devices 50[1] and / or 50[2] increases, and the adjusted supply voltage VS (initial value 3.5V) has squeezed the minimum voltage required by the mobile charging circuit 51. Therefore, in this embodiment, when the supply current IS decreases by a preset current difference I_stp (for example, 0.2*I_CC), the conversion control circuit 16 controls the switching power conversion circuit 14 to increase the level of the supply voltage VS by a preset voltage difference V_stp (corresponding to step S4) to continue charging the batteries 52 in each mobile device. Figure 13 As shown, the preset voltage difference V_stp is, for example, 0.3V. Therefore, at time point T2, the supply voltage VS is increased to 3.8V to continue to power the mobile device, and this is repeated until the voltage upper limit of the supply voltage VS is, for example, 4.4V. Figure 13 As shown, after time point T4, the mobile device 50[1] and / or 50[2] enters a constant voltage charging mode (e.g., corresponding to Figure 12BIn the final charging process of step S9 shown in FIG, the supply current I_CC (corresponding to the charging current Ich) decreases over time until the supply current I_CC is reached and the mobile device stops charging completely. At this time, the switching power converter circuit 14 can choose to stop providing supply power, for example, to further save power.

[0107] It should be noted that Figure 13 In the embodiment, the initial value of the supply voltage VS in step S3 is 3.5V, which is determined based on the principle of power saving mode, which is to reduce the cross voltage of all mobile devices as much as possible, with power saving as the primary goal. On the other hand, in other embodiments, it is also possible to select Figure 6B For example, the second mode turning point corresponds to 3.9V, which serves as the initial supply voltage VS. This principle applies to fast charging, which maximizes charging speed while reducing the cross-voltage of some mobile devices, with the primary goal of shortening charging time. Details of various power supply modes will be discussed later.

[0108] It should be noted that the aforementioned preset current difference I_stp or the preset voltage difference V_stp may be a fixed value or a variable value, for example, it may be adaptively changed according to the charging mode of the mobile device.

[0109] Figure 12C A flow chart showing a conversion control circuit controlling a switching power conversion circuit according to the present invention. Figure 12C Examples and Figure 12B Similar to the embodiment, Figure 12C In the embodiment, after step S3, the conversion control circuit 16 further controls the switching power conversion circuit 14 according to the following steps after step S3:

[0110] Step S5: After a preset charging period T_stp, return to step S1 and repeat until charging is completed (steps S8 and S10). Specifically, in this embodiment, after steps S21 and S3, the mobile device 50[1] and / or 50[2] charges the corresponding battery 52 for a preset charging period T_stp under the adjusted supply voltage VS, and then re-performs step S1 to update the current-voltage characteristic curve of the power supply, and readjusts the supply voltage VS according to the updated current-voltage characteristic curve, and repeats this process until charging is completed.

[0111] It should be noted that the aforementioned preset charging period T_stp may be a fixed value or a variable value, for example, it may be adaptively changed according to the charging mode of the mobile device.

[0112] Figure 14AThe flowchart of the conversion control circuit according to the present invention for controlling the switching power conversion circuit is shown, wherein a more specific embodiment of step S21 is shown. Figure 14A and compare Figure 11 In this embodiment, step S21 includes: when there is at least one mode turning point in the current-voltage characteristic curve, comparing a preset pre-charging current level I_PC with a preset constant current charging current level I_CC according to the information indicated by the supply current IS corresponding to the at least one mode turning point, thereby determining the combination of charging modes of the mobile device 50[1] and the mobile device 50[2]. Specifically, since the mobile device has a specific current level or a specific range of current levels when it is in a specific charging mode, the combination of charging modes of the mobile device 50[1] and the mobile device 50[2] can be determined based on the level of the supply current IS at or after the mode turning point in the current-voltage characteristic curve of the power supply, and the details will be described in detail later.

[0113] Figure 14B A more specific embodiment of a flow chart showing a conversion control circuit controlling a switching power conversion circuit according to the present invention. Figure 14B and compare Figure 11 In this embodiment, step S21 further includes: comparing the information indicated by the supply voltage VS corresponding to at least one mode turning point of the current-voltage characteristic curve with the constant voltage charging voltage threshold Vthcv and the constant current charging voltage threshold Vthcc, thereby determining the combination of charging modes of the mobile device 50[1] and the mobile device 50[2]. Specifically, since the mobile device has a specific voltage level or a specific range of voltage levels when it is in a specific charging mode, the combination of charging modes of the mobile device 50[1] and the mobile device 50[2] can be determined based on the voltage level of the mode turning point in the current-voltage characteristic curve of the supply power source, and the details will be described in detail later.

[0114] Figure 14C A specific embodiment of the flowchart showing the control circuit of the switching power conversion circuit according to the present invention. Figure 14C and compare Figure 11 In this embodiment, in step S21, the charging control device is based on the current-voltage characteristic curve, as well as Figure 11 The charging mode classification table can be used to determine the mode of the mobile device 50[1] and the mobile device 50[2] by at least one of the following steps:

[0115] S210: When the current-voltage characteristic curve does not have a mode turning point, or within the preset voltage range, the corresponding supply current IS is lower than the preset pre-charge current level I_PC, it is determined to be in mode combination 0: wherein the mobile device 50[1] and the mobile device 50[2] are both in the stop charging mode.

[0116] S211: When the current-voltage characteristic curve has one and only one mode turning point, and after the supply voltage VS exceeds the mode turning point, the corresponding supply current IS level is equal to the preset pre-charge current level I_PC, it is determined to be in mode combination 1: one of the mobile device 50[1] and the mobile device 50[2] is in the pre-charge mode, and the other one is in the stop charging mode.

[0117] S212: When the current-voltage characteristic curve has one and only one mode turning point, and after the supply voltage VS exceeds the mode turning point, the corresponding supply current IS level is greater than the preset pre-charge current level I_PC and less than the constant current charging current level I_CC, it is determined to be in mode combination 2: one of the mobile device 50[1] and the mobile device 50[2] is in the constant voltage charging mode, and the other one is in the stop charging mode.

[0118] S213: When the current-voltage characteristic curve has one and only one mode turning point, and after the supply voltage VS exceeds the mode turning point, the corresponding supply current IS level is equal to the preset constant current charging current level I_CC, it is determined to be in mode combination 3: one of the mobile device 50[1] and the mobile device 50[2] is in the constant current charging mode, and the other one is in the stop charging mode.

[0119] S214: When the current-voltage characteristic curve has at least one mode turning point, and the supply current IS corresponding to the highest of the supply voltages VS corresponding to at least one mode turning point is equal to twice the preset pre-charge current level I_PC, it is determined to be in mode combination 4: wherein the mobile device 50[1] and the mobile device 50[2] are both in the pre-charge mode.

[0120] S215: When the current-voltage characteristic curve has multiple mode turning points, and the supply current IS corresponding to the highest supply voltage VS among the multiple mode turning points is greater than twice the preset pre-charge current level I_PC and less than the sum of the preset constant current charging current level I_CC and the preset pre-charge current level I_PC, it is determined to be in mode combination 5: one of the mobile device 50[1] and the mobile device 50[2] is in the constant voltage charging mode, and the other one is in the pre-charge mode.

[0121] S216: When the current-voltage characteristic curve has at least one mode turning point, and the supply current IS corresponding to the highest of the supply voltages VS corresponding to at least one mode turning point is greater than 2 times the preset pre-charge current level I_PC and less than 2 times the constant current charging current level I_CC, it is determined to be in mode combination 6: wherein both the mobile device 50[1] and the mobile device 50[2] are in the constant voltage charging mode.

[0122] S217: When the current-voltage characteristic curve has at least one mode turning point, and the supply current IS corresponding to the highest of the supply voltages VS corresponding to at least one mode turning point is equal to the sum of the preset constant current charging current level I_CC and the preset pre-charging current level I_PC, it is determined to be in mode combination 7: one of the mobile device 50[1] and the mobile device 50[2] is in the constant current charging mode, and the other one is in the pre-charging mode.

[0123] S218: When the current-voltage characteristic curve has at least one mode turning point, and the supply current IS corresponding to the highest of the supply voltages VS corresponding to at least one mode turning point is greater than the sum of the preset constant current charging current level I_CC and the preset pre-charge current level I_PC and is less than 2 times the constant current charging current level I_CC, it is determined that the mobile device is in mode combination 8: one of the mobile device 50[1] and the mobile device 50[2] is in the constant current charging mode, and the other is in the constant voltage charging mode. And / or

[0124] S219: When the current-voltage characteristic curve has at least one mode turning point, and the supply current IS corresponding to the highest of the supply voltages VS corresponding to at least one mode turning point is equal to twice the preset constant current charging current level I_CC, it is determined to be in mode combination 9: wherein both the mobile device 50[1] and the mobile device 50[2] are in the constant current charging mode.

[0125] It should be noted that, from one perspective, twice the constant charging current level I_CC described in steps S216, S218, and S219 may correspond to the sum of all preset constant charging current levels of the mobile device 50[1] and the mobile device 50[2], wherein the preset constant charging current levels I_CC corresponding to the mobile device 50[1] and the mobile device 50[2] may be the same level, or in other embodiments, they may be different levels. And twice the pre-charging current level I_PC described in steps S214 and S216 may correspond to the sum of all preset pre-charging current levels of the mobile device 50[1] and the mobile device 50[2], wherein the preset pre-charging current levels I_PC corresponding to the mobile device 50[1] and the mobile device 50[2] may be the same level, or in other embodiments, they may be different levels.

[0126] Please continue reading Figure 14C , while controlling Figure 11 In one embodiment, step S212 further includes: determining that the mobile device 50[1] and the mobile device 50[2] are in mode combination 2 only when the supply voltage VS corresponding to the mode turning point is greater than or equal to the constant voltage charging voltage threshold Vthcv.

[0127] In one embodiment, step S215 further includes: when the highest of the supply voltages VS corresponding to the multiple mode turning points is greater than or equal to the constant voltage charging voltage threshold Vthcv, and the voltage level of the lowest of them is less than the constant current charging voltage threshold Vthcc, it is determined that the mobile device 50[1] and the mobile device 50[2] are in mode combination 5.

[0128] In one embodiment, step S216 further includes: determining that the mobile device 50[1] and the mobile device 50[2] are in mode combination 6 only when the supply voltage VS corresponding to at least one mode turning point is greater than or equal to the constant voltage charging voltage threshold Vthcv.

[0129] In one embodiment, step S218 further includes: when the highest of the supply voltages VS corresponding to at least one mode turning point is greater than the constant voltage charging voltage threshold Vthcv, and the voltage level of the lowest of them is less than the constant voltage charging voltage threshold Vthcv and greater than or equal to the constant current charging voltage threshold Vthcc, it is determined that the mobile device 50[1] and the mobile device 50[2] are in mode combination 8.

[0130] It is worth noting that, in one embodiment, when it is determined that the aforementioned mode combination 0 is in progress (ie, all mobile devices are in the stop charging mode), the charging control device may stop providing power supply to further save power consumption.

[0131] Figure 15 A flowchart of a specific embodiment of the present invention is shown, wherein the charging control device controls the switching power conversion circuit to charge the mobile device. In the process with step S21, the conversion control circuit 16 can also control the switching power conversion circuit 14 to adjust the supply voltage VS to charge the battery 52 in each mobile device according to the combination of the charging modes of the mobile device 50[1] and the mobile device 50[2], thereby reducing the voltage across each mobile charging circuit to reduce power loss.

[0132] In detail, Figure 15 As shown, in one embodiment, step S3 includes one of the following steps:

[0133] S31: When the mobile device 50[1] and the mobile device 50[2] are determined to be in mode combination 1, 2 or 3 (i.e., there is only one and only mode turning point) through the aforementioned mode determination step S21, the initial level of the supply voltage VS is determined based on the supply voltage VS corresponding to the one and only mode turning point to simultaneously power multiple mobile devices, so that each mobile device charges the battery 52 therein, thereby increasing the charging speed and reducing the voltage across each mobile charging circuit to reduce power loss.

[0134] In one embodiment, when there are multiple mode turning points, the configuration of the power supply can be determined according to the power supply mode set by the user or determined by the system according to the overall conditions. Figure 15 As shown, in one embodiment, step S3 includes one of the following steps:

[0135] Step S32: When the mobile device 50[1] and the mobile device 50[2] are in mode combinations 4 to 9 (i.e., there are only a plurality of mode turning points), in the power saving mode, the level of the supply voltage VS is determined according to the lowest one of the supply voltages VS corresponding to at least one mode turning point to charge the battery 52 in each mobile device, thereby reducing the voltage across each mobile charging circuit to reduce power loss.

[0136] Step S33: When the mobile device 50[1] and the mobile device 50[2] are in mode combinations 4 to 9, in the fast charging power supply mode, the level of the supply voltage VS is determined according to the highest one of the supply voltages VS corresponding to at least one mode turning point to charge the battery 52 in each mobile device, thereby increasing the charging speed and reducing the cross-voltage of each mobile charging circuit to reduce power loss. Or

[0137] Step S34: When the mobile device 50[1] and the mobile device 50[2] are in mode combinations 4 to 9, in the balanced power supply mode, the level of the supply voltage VS is adjusted so that it is between the highest and the lowest of the supply voltages VS corresponding to at least one mode turning point to charge the battery 52 in each mobile device, thereby balancing the charging speed and power loss.

[0138] It should be noted that, from one point of view, the supply voltage levels corresponding to the multiple mode turning points of mode combinations 4 to 9 are different in one embodiment, and therefore can be clearly determined as multiple mode turning points. However, in other embodiments, the supply voltage levels corresponding to the multiple mode turning points may overlap. Although it is not possible to clearly determine that they are multiple mode turning points based on the appearance of the current-voltage characteristic curve, as long as they are in mode combinations 4 to 9, they can be considered to have multiple mode turning points.

[0139] In addition, if Figure 15As shown, before steps S31 to S34, in one embodiment, step S3 may further include steps S30a and S30b. In step S30a, it is determined whether the current-voltage characteristic curve has at least one mode turning point. If no mode turning point exists (corresponding to mode combination 0), for example, the power supply may be stopped (corresponding to "end" in step S10). In step S30b, it is determined whether the current-voltage characteristic curve has only one and only mode turning point (corresponding to mode combinations 1 to 3). If there are multiple mode turning points, it corresponds to mode combinations 4 to 9.

[0140] Figures 16A-16B A flowchart showing a specific embodiment of a charging control device according to the present invention controlling a switching power conversion circuit to charge a mobile device. Figures 12A to 12C Similar to the embodiment, Figure 16A and Figure 16B The embodiment can be regarded as omitting Figure 12B and Figure 12C In the embodiment, step S21 is skipped, i.e., the mode determination step, and in step S22, the supply voltage VS is adjusted to charge the battery 52 in each mobile device according to whether there is a mode turning point and the information indicated by the mode turning point.

[0141] like Figure 16A and Figure 16B As shown, in this embodiment, after step S22, the conversion control circuit 16 further controls the switching power conversion circuit 14 according to step S4 or step S5, wherein the operation details of step S4 or step S5 can be referred to. Figure 12B and Figure 12C The corresponding description will not be repeated here.

[0142] Figure 17 A flowchart illustrating a more specific embodiment of a charging control device according to the present invention controlling a switching power converter circuit to charge a mobile device is shown. In step S22, the conversion control circuit 16 determines the supply voltage VS to charge the battery 52 in each mobile device based on information indicated by the mode turning point in the current-voltage characteristic curve of the supply power source. This reduces the voltage across each mobile charging circuit, thereby minimizing power loss.

[0143] In detail, Figure 17 As shown, in one embodiment, step S22 includes one of the following steps:

[0144] S221: In a power saving mode, the supply voltage VS is determined according to the lowest supply voltage VS corresponding to at least one mode turning point to charge the battery 52 in each mobile device, thereby reducing the voltage across each mobile charging circuit to reduce power loss.

[0145] S222: In a fast charging power supply mode, the level of the supply voltage VS is determined based on the highest of the supply voltages VS corresponding to at least one mode turning point to charge the battery 52 in each mobile device, thereby increasing the charging speed and reducing the voltage across each mobile charging circuit to reduce power loss.

[0146] S223: In a balanced power supply mode, adjust the supply voltage VS to a level between the highest and the lowest supply voltage VS corresponding to at least one mode turning point to charge the battery 52 in each mobile device, thereby balancing charging speed and power loss.

[0147] It should be noted that in steps S221 to S223 , when there is only one mode turning point or the corresponding supply voltage VS overlaps, the so-called highest or lowest is the only supply voltage level.

[0148] In addition, if Figure 17 As shown, before steps S221 to S223, in one embodiment, step S22 may further include step S220, wherein in step S220, it is determined whether there is at least one mode turning point in the current-voltage characteristic curve. When no mode turning point exists (corresponding to mode combination 0), for example, the power supply may be stopped (corresponding to "end" of step S10).

[0149] The present invention has been described above with reference to preferred embodiments. However, the above description is intended only to facilitate understanding of the present invention by those skilled in the art and is not intended to limit the scope of the present invention. The various embodiments described are not limited to individual application and may also be applied in combination. For example, two or more embodiments may be used in combination, and components of one embodiment may be substituted for corresponding components of another embodiment. Furthermore, within the spirit of the present invention, those skilled in the art may conceive of various equivalent variations and combinations. For example, the phrase "processing or calculating based on a signal or generating an output result" as used herein is not limited to the signal itself but also includes, when necessary, performing voltage-to-current conversion, current-to-voltage conversion, and / or ratio conversion on the signal, and then processing or calculating based on the converted signal to generate an output result. For another example, the aforementioned embodiment uses two mobile devices as an example, but this is not limiting. Based on the teachings of the present invention, it is reasonable to infer that three or more mobile devices can be used. Of course, in this case, there will be three or more mode turning points. Furthermore, multiple mobile devices may have different characteristics, such as supporting different charging modes, or having different current and voltage values ​​corresponding to pre-charging, constant current charging, or constant voltage charging modes. As long as this preset information can be obtained in advance, the aforementioned mode determination and supply voltage determination can still be performed according to the spirit of the present invention to achieve the aforementioned energy saving effect. It can be seen that, within the same spirit of the present invention, those skilled in the art can conceive of various equivalent variations and combinations, and the number of such combinations is too numerous to be fully enumerated here. Therefore, the scope of the present invention should cover the aforementioned and all other equivalent variations.

Claims

1. A charging control device for providing a power supply to a first mobile device and a second mobile device, wherein the first mobile device and the second mobile device each comprise: A mobile charging circuit and a first battery, wherein the mobile charging circuit converts the supply power to generate a charging power to charge the corresponding first battery, wherein the mobile charging circuit operates in at least two charging modes of a pre-charging mode, a constant current charging mode, and a constant voltage charging mode to charge the corresponding first battery; the charging control device includes: a switching power conversion circuit for converting an input power source to generate the supply power source, wherein the supply power source has a supply voltage and a supply current; and a conversion control circuit for controlling the switching power conversion circuit; The conversion control circuit controls the switching power conversion circuit according to the following steps: S1: Controlling the switching power converter circuit to gradually adjust the supply voltage level within a predetermined voltage range and sense the corresponding supply current level, or gradually adjust the supply current level within a predetermined current range and sense the corresponding supply voltage level, thereby establishing a current-voltage characteristic curve corresponding to the supply power source; as well as S2: performing one of the following operations based on whether the current-voltage characteristic curve has at least one mode turning point, and if at least one mode turning point exists, based on information indicated by the supply current and / or the supply voltage corresponding to the at least one mode turning point: S21: Determine the combination of charging modes of the first mobile device and the second mobile device; or S22: When at least one mode turning point exists, adjust the supply voltage to charge the first battery in each mobile device according to information of the supply voltage or the supply current corresponding to the at least one mode turning point, thereby reducing the voltage across each mobile charging circuit to reduce power loss.

2. The charging control device according to claim 1, wherein step S21 comprises: In the presence of at least one mode turning point, a preset pre-charging current level and a preset constant current charging current level are compared based on the information indicated by the supply current corresponding to the at least one mode turning point, thereby determining the combination of charging modes of the first mobile device and the second mobile device.

3. The charging control device of claim 2 , wherein in step S21, information indicating the supply voltage corresponding to at least one mode turning point of the current-voltage characteristic curve is compared with a constant-voltage charging voltage threshold and a constant-current charging voltage threshold to determine the combination of charging modes of the first mobile device and the second mobile device.

4. The charging control device of claim 3 , wherein in step S21 , the charging control device determines the mode of the first mobile device and the second mobile device according to the current-voltage characteristic curve by at least one of the following steps: S210: When the current-voltage characteristic curve does not have a mode turning point, or the corresponding supply current within the predetermined voltage range is lower than the predetermined pre-charge current level, determining that the device is in mode combination 0: wherein both the first mobile device and the second mobile device are in a stop charging mode; S211: When the current-voltage characteristic curve has one and only one mode turning point, and after the supply voltage exceeds the mode turning point, the corresponding supply current level is equal to the predetermined pre-charge current level, determining that the device is in mode combination 1: one of the first mobile device and the second mobile device is in the pre-charge mode, and the other is in the stop-charge mode; S212: When the current-voltage characteristic curve has one and only one mode turning point, and after the supply voltage exceeds the mode turning point, the corresponding supply current level is greater than the preset pre-charge current level and less than the constant-current charging current level, determining that the device is in mode combination 2: one of the first mobile device and the second mobile device is in the constant-voltage charging mode, and the other is in the stop charging mode; S213: When the current-voltage characteristic curve has one and only one mode inflection point, and after the supply voltage exceeds the mode inflection point, the corresponding supply current level is equal to the preset constant current charging current level, determining that the device is in mode combination 3: one of the first mobile device and the second mobile device is in the constant current charging mode, and the other of the first mobile device and the second mobile device is in the stop charging mode; S214: When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is equal to twice the predetermined pre-charge current level, determining that the device is in mode combination 4: wherein both the first mobile device and the second mobile device are in the pre-charge mode; S215: When the current-voltage characteristic curve has a plurality of mode turning points, and the supply current corresponding to the highest of the supply voltages corresponding to the plurality of mode turning points is greater than twice the predetermined pre-charge current level and less than the sum of the predetermined constant-current charging current level and the predetermined pre-charge current level, determining that the device is in mode combination 5: one of the first mobile device and the second mobile device is in the constant-voltage charging mode, and the other of the two is in the pre-charge mode; S216: When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is greater than twice the predetermined pre-charge current level and less than twice the constant-current charging current level, determining that the device is in mode combination 6: wherein both the first mobile device and the second mobile device are in the constant-voltage charging mode; S217: When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is equal to the sum of the preset constant-current charging current level and the preset pre-charging current level, determine that the device is in mode combination 7: one of the first mobile device and the second mobile device is in the constant-current charging mode, and the other of the two mobile devices is in the pre-charging mode; S218: When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is greater than the sum of the preset constant-current charging current level and the preset pre-charging current level and less than twice the constant-current charging current level, determine that the device is in mode combination 8: one of the first mobile device and the second mobile device is in the constant-current charging mode, and the other of the two is in the constant-voltage charging mode; and / or S219: When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is equal to twice the preset constant current charging current level, it is determined to be in mode combination 9: wherein the first mobile device and the second mobile device are both in the constant current charging mode.

5. The charging control device of claim 4 , wherein when the charging control device determines the modes of the first mobile device and the second mobile device according to at least one of steps S212 , S215 , S216 , or S218 , each step further comprises the following corresponding operations: Step S212 further includes: When the supply voltage corresponding to the mode turning point is greater than or equal to the constant charging voltage threshold, it is determined that the first mobile device and the second mobile device are in the mode combination 2; Step S215 further includes determining that the first mobile device and the second mobile device are in mode combination 5 only when the highest of the supply voltages corresponding to the plurality of mode turning points is greater than or equal to the constant-voltage charging voltage threshold and the lowest of the supply voltages is less than the constant-current charging voltage threshold; Step S216 further includes: determining that the first mobile device and the second mobile device are in mode combination 6 only when the supply voltage corresponding to the at least one mode turning point is greater than or equal to the constant voltage charging voltage threshold; and / or Step S218 also includes: when the highest of the supply voltages corresponding to the at least one mode turning point is greater than the constant voltage charging voltage threshold, and the voltage level of the lowest one thereof is less than the constant voltage charging voltage threshold and greater than or equal to the constant current charging voltage threshold, it is determined that the first mobile device and the second mobile device are in mode combination 8.

6. The charging control device of claim 5 , wherein in the case of step S21 , the conversion control circuit further controls the switching power conversion circuit according to the following steps: S3: Adjusting the supply voltage to charge the first battery in each mobile device according to the combination of the charging modes of the first mobile device and the second mobile device and the information indicated by the at least one mode turning point, thereby reducing the voltage across each mobile charging circuit to reduce power loss.

7. The charging control device according to claim 6, wherein step S3 comprises the following steps: S31: When the first mobile device and the second mobile device are in mode combination 1, 2 or 3, the supply voltage level is determined according to the supply voltage corresponding to the one and only mode turning point to charge the first battery in each mobile device, thereby increasing the charging speed and reducing the voltage across each mobile charging circuit to reduce power loss.

8. The charging control device according to claim 6, wherein step S3 comprises one of the following steps: S32: When the first mobile device and the second mobile device are in mode combinations 4-9, in a power saving mode, determining the supply voltage level for charging the first battery in each mobile device according to the lowest of the supply voltages corresponding to the at least one mode turning point, thereby reducing the voltage across each mobile charging circuit to reduce power loss; S33: When the first mobile device and the second mobile device are in mode combinations 4-9, in a fast charging power supply mode, determining the supply voltage level to charge the first battery in each mobile device according to the highest of the supply voltages corresponding to the at least one mode turning point, thereby increasing the charging speed and reducing the voltage across each mobile charging circuit to reduce power loss; or S34: When the first mobile device and the second mobile device are in mode combinations 4 to 9, in a balanced power supply mode, the supply voltage level is adjusted so that it is between the highest and the lowest supply voltages corresponding to at least one mode turning point to charge the first battery in each of the mobile devices, thereby balancing the charging speed and power loss.

9. The charging control device according to claim 1 , wherein step S22 comprises one of the following steps: S221: In a power saving mode, determining the supply voltage level to charge the first battery in each of the mobile devices according to the lowest of the supply voltages corresponding to the at least one mode turning point, thereby reducing the voltage across each mobile charging circuit to reduce power loss; S222: In a fast charging power supply mode, determining the supply voltage level to charge the first battery in each of the mobile devices according to the highest of the supply voltages corresponding to the at least one mode turning point, thereby increasing the charging speed and reducing the voltage across each mobile charging circuit to reduce power loss; or S223: In a balanced power supply mode, adjust the supply voltage level to be between the highest and the lowest supply voltages corresponding to the at least one mode turning point to charge the first battery in each of the mobile devices, thereby balancing charging speed and power loss.

10. The charging control device of claim 1 , wherein after step S22 , the conversion control circuit further controls the switching power conversion circuit according to the following steps: S4: When sensing and determining that the supply current drops by a preset current difference, the supply voltage level is increased by a preset voltage difference to continue charging the first battery in each mobile device, and the process is repeated until charging is completed.

11. The charging control device of claim 1 , wherein after step S22 , the conversion control circuit further controls the switching power conversion circuit according to the following steps: S5: After a preset charging period, return to step S1.

12. The charging control device of claim 6 , wherein after step S3 , the conversion control circuit further controls the switching power conversion circuit according to the following steps: S4: When sensing and determining that the supply current drops by a preset current difference, the supply voltage level is increased by a preset voltage difference to continue charging the first battery in each mobile device, and the process is repeated until charging is completed.

13. The charging control device of claim 6 , wherein after step S3 , the conversion control circuit further controls the switching power conversion circuit according to the following steps: S5: After a preset charging period, return to step S1 and repeat until charging is completed.

14. The charging control device according to claim 1, further comprising: A fuel gauge circuit is coupled to the conversion control circuit and a second battery for providing the input power, and is configured to sense a current of the second battery when the second battery is charged or discharged to record the charge level of the second battery, wherein the current of the second battery corresponds to the supply current when the supply power is provided to the first mobile device and the second mobile device.

15. The charging control device as claimed in claim 14, further comprising the second battery.

16. The charging control device as claimed in claim 14, wherein in step S1, the second battery stops receiving charging. 17 . The charging control device as claimed in claim 1 , wherein the mobile charging circuit is configured as a linear charging circuit.

18. The charging control device of claim 4, wherein when it is determined that the mode combination is 0, the charging control device stops providing the supply power.

19. A charging control method for providing a power supply to a first mobile device and a second mobile device, wherein the first mobile device and the second mobile device each comprise: a mobile charging circuit and a first battery, wherein the mobile charging circuit converts the supply power to generate a charging power source to charge the corresponding first battery, wherein the mobile charging circuit operates in at least two charging modes of a pre-charging mode, a constant current charging mode, and a constant voltage charging mode to charge the corresponding first battery; The power supply has a supply voltage and a supply current; The charging control method includes: S1: gradually adjusting the supply voltage level within a preset voltage range and sensing the corresponding supply current level, or gradually adjusting the supply current level within a preset current range and sensing the corresponding supply voltage level, thereby establishing a current-voltage characteristic curve corresponding to the supply power source; as well as S2: performing one of the following operations based on whether the current-voltage characteristic curve has at least one mode turning point, and if at least one mode turning point exists, based on information indicated by the supply current and / or the supply voltage corresponding to the at least one mode turning point: S21: Determine the combination of charging modes of the first mobile device and the second mobile device; or S22: When at least one mode turning point exists, adjust the supply voltage to charge the first battery in each of the mobile devices according to information of the supply voltage or the supply current corresponding to the at least one mode turning point, thereby reducing the voltage across each of the mobile charging circuits to reduce power loss.

20. The charging control method according to claim 19, wherein step S21 comprises: In the presence of at least one mode turning point, a preset pre-charging current level and a preset constant current charging current level are compared based on the information indicated by the supply current corresponding to the at least one mode turning point, thereby determining the combination of charging modes of the first mobile device and the second mobile device.

21. The charging control method of claim 20, wherein in step S21, information indicated by the supply voltage corresponding to at least one mode turning point of the current-voltage characteristic curve is compared with a constant-voltage charging voltage threshold and a constant-current charging voltage threshold to determine the combination of charging modes of the first mobile device and the second mobile device.

22. The charging control method of claim 21, wherein in step S21, the modes of the first mobile device and the second mobile device are determined according to the current-voltage characteristic curve by at least one of the following steps: S210: When the current-voltage characteristic curve does not have a mode turning point, or the corresponding supply current within the predetermined voltage range is lower than the predetermined pre-charge current level, determining that the device is in mode combination 0: wherein both the first mobile device and the second mobile device are in a stop charging mode; S211: When the current-voltage characteristic curve has one and only one mode turning point, and after the supply voltage exceeds the mode turning point, the corresponding supply current level is equal to the predetermined pre-charge current level, determining that the device is in mode combination 1: one of the first mobile device and the second mobile device is in the pre-charge mode, and the other is in the stop-charge mode; S212: When the current-voltage characteristic curve has one and only one mode turning point, and after the supply voltage exceeds the mode turning point, the corresponding supply current level is greater than the preset pre-charge current level and less than the constant-current charging current level, determining that the device is in mode combination 2: one of the first mobile device and the second mobile device is in the constant-voltage charging mode, and the other is in the stop charging mode; S213: When the current-voltage characteristic curve has one and only one mode inflection point, and after the supply voltage exceeds the mode inflection point, the corresponding supply current level is equal to the preset constant current charging current level, determining that the device is in mode combination 3: one of the first mobile device and the second mobile device is in the constant current charging mode, and the other of the first mobile device and the second mobile device is in the stop charging mode; S214: When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is equal to twice the predetermined pre-charge current level, determining that the device is in mode combination 4: wherein both the first mobile device and the second mobile device are in the pre-charge mode; S215: When the current-voltage characteristic curve has a plurality of mode turning points, and the supply current corresponding to the highest of the supply voltages corresponding to the plurality of mode turning points is greater than twice the predetermined pre-charge current level and less than the sum of the predetermined constant-current charging current level and the predetermined pre-charge current level, determining that the device is in mode combination 5: one of the first mobile device and the second mobile device is in the constant-voltage charging mode, and the other of the two is in the pre-charge mode; S216: When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is greater than twice the predetermined pre-charge current level and less than twice the constant-current charging current level, determining that the device is in mode combination 6: wherein both the first mobile device and the second mobile device are in the constant-voltage charging mode; S217: When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is equal to the sum of the preset constant-current charging current level and the preset pre-charging current level, determine that the device is in mode combination 7: one of the first mobile device and the second mobile device is in the constant-current charging mode, and the other of the two mobile devices is in the pre-charging mode; S218: When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is greater than the sum of the preset constant-current charging current level and the preset pre-charging current level and less than twice the constant-current charging current level, determine that the device is in mode combination 8: one of the first mobile device and the second mobile device is in the constant-current charging mode, and the other of the two is in the constant-voltage charging mode; and / or S219: When the current-voltage characteristic curve has at least one mode turning point, and the supply current corresponding to the highest of the supply voltages corresponding to the at least one mode turning point is equal to twice the preset constant current charging current level, it is determined to be in mode combination 9: wherein the first mobile device and the second mobile device are both in the constant current charging mode.

23. The charging control method of claim 22, wherein when determining the modes of the first mobile device and the second mobile device according to at least one of steps S212, S215, S216, or S218, each step further comprises the following corresponding operations: Step S212 further includes: When the supply voltage corresponding to the mode turning point is greater than or equal to the constant charging voltage threshold, it is determined that the first mobile device and the second mobile device are in the mode combination 2; Step S215 further includes determining that the first mobile device and the second mobile device are in mode combination 5 only when the highest of the supply voltages corresponding to the plurality of mode turning points is greater than or equal to the constant-voltage charging voltage threshold and the lowest of the supply voltages is less than the constant-current charging voltage threshold; Step S216 further includes: determining that the first mobile device and the second mobile device are in mode combination 6 only when the supply voltage corresponding to the at least one mode turning point is greater than or equal to the constant voltage charging voltage threshold; and / or Step S218 also includes: when the highest of the supply voltages corresponding to the at least one mode turning point is greater than the constant voltage charging voltage threshold, and the voltage level of the lowest one thereof is less than the constant voltage charging voltage threshold and greater than or equal to the constant current charging voltage threshold, it is determined that the first mobile device and the second mobile device are in mode combination 8.

24. The charging control method of claim 23, wherein in the case of step S21, the power supply is further controlled according to the following steps: S3: Adjusting the supply voltage to charge the first battery in each mobile device according to the combination of the charging modes of the first mobile device and the second mobile device and the information indicated by the at least one mode turning point, thereby reducing the voltage across each mobile charging circuit to reduce power loss.

25. The charging control method according to claim 24, wherein step S3 comprises the following steps: S31: When the first mobile device and the second mobile device are in mode combination 1, 2 or 3, the supply voltage level is determined according to the supply voltage corresponding to the one and only mode turning point to charge the first battery in each mobile device, thereby increasing the charging speed and reducing the voltage across each mobile charging circuit to reduce power loss.

26. The charging control method according to claim 24, wherein step S3 comprises one of the following steps: S32: When the first mobile device and the second mobile device are in mode combinations 4-9, in a power saving mode, determining the supply voltage level for charging the first battery in each mobile device according to the lowest of the supply voltages corresponding to the at least one mode turning point, thereby reducing the voltage across each mobile charging circuit to reduce power loss; S33: When the first mobile device and the second mobile device are in mode combinations 4-9, in a fast charging power supply mode, determining the supply voltage level to charge the first battery in each mobile device according to the highest of the supply voltages corresponding to the at least one mode turning point, thereby increasing the charging speed and reducing the voltage across each mobile charging circuit to reduce power loss; or S34: When the first mobile device and the second mobile device are in mode combinations 4 to 9, in a balanced power supply mode, the supply voltage level is adjusted so that it is between the highest and the lowest supply voltages corresponding to at least one mode turning point to charge the first battery in each of the mobile devices, thereby balancing the charging speed and power loss.

27. The charging control method according to claim 19, wherein step S22 comprises one of the following steps: S221: In a power saving mode, determining the supply voltage level to charge the first battery in each of the mobile devices according to the lowest of the supply voltages corresponding to the at least one mode turning point, thereby reducing the voltage across each mobile charging circuit to reduce power loss; S222: In a fast charging power supply mode, determining the supply voltage level to charge the first battery in each of the mobile devices according to the highest of the supply voltages corresponding to the at least one mode turning point, thereby increasing the charging speed and reducing the voltage across each mobile charging circuit to reduce power loss; or S223: In a balanced power supply mode, adjust the supply voltage level to be between the highest and the lowest supply voltages corresponding to the at least one mode turning point to charge the first battery in each of the mobile devices, thereby balancing charging speed and power loss.

28. The charging control method of claim 19, wherein after step S22, the power supply is further controlled according to the following steps: S4: When sensing and determining that the supply current drops by a preset current difference, the supply voltage level is increased by a preset voltage difference to continue charging the first battery in each mobile device, and the process is repeated until charging is completed.

29. The charging control method of claim 19, wherein after step S22, the power supply is further controlled according to the following steps: S5: After a preset charging period, return to step S1.

30. The charging control method of claim 24, wherein after step S3, the power supply is further controlled according to the following steps: S4: When sensing and determining that the supply current drops by a preset current difference, the supply voltage level is increased by a preset voltage difference to continue charging the first battery in each mobile device, and the process is repeated until charging is completed.

31. The charging control method of claim 24, wherein after step S3, the power supply is further controlled according to the following steps: S5: After a preset charging period, return to step S1 and repeat until charging is completed.

32. The charging control method of claim 22, wherein when it is determined that the mode combination is 0, the supply power is stopped.

33. A charging system comprising: A plurality of mobile devices, the plurality of mobile devices including a first mobile device and a second mobile device, wherein each of the plurality of mobile devices includes: a mobile charging circuit; as well as a first battery, wherein the mobile charging circuit converts a supply power source to generate a charging power source to charge the corresponding first battery, wherein the mobile charging circuit operates in at least two charging modes of a pre-charging mode, a constant current charging mode, and a constant voltage charging mode to charge the corresponding first battery; and a charging control device removably coupled to the plurality of mobile devices for providing the power supply to the first mobile device and the second mobile device, the charging control device comprising: a switching power conversion circuit for converting an input power source to generate the supply power source, wherein the supply power source has a supply voltage and a supply current; and a conversion control circuit for controlling the switching power conversion circuit; The conversion control circuit controls the switching power conversion circuit according to the following steps: S1: Controlling the switching power converter circuit to gradually adjust the supply voltage level within a preset voltage range and sense the corresponding supply current level, or gradually adjust the supply current level within a preset current range and sense the corresponding supply voltage level, thereby establishing a current-voltage characteristic curve corresponding to the supply power source; and S2: performing one of the following operations based on whether the current-voltage characteristic curve has at least one mode turning point, and if at least one mode turning point exists, based on information indicated by the supply current and / or the supply voltage corresponding to the at least one mode turning point: S21: Determine the combination of charging modes of the first mobile device and the second mobile device; or S22: When at least one mode turning point exists, adjust the supply voltage to charge the first battery in each of the mobile devices according to information of the supply voltage or the supply current corresponding to the at least one mode turning point, thereby reducing the voltage across each of the mobile charging circuits to reduce power loss.

34. The charging system of claim 33, wherein step S21 comprises: In the presence of at least one mode turning point, a preset pre-charging current level and a preset constant current charging current level are compared based on the information indicated by the supply current corresponding to the at least one mode turning point, thereby determining the combination of charging modes of the first mobile device and the second mobile device.

35. The charging system of claim 34, wherein in step S21, information indicated by the supply voltage corresponding to at least one mode turning point of the current-voltage characteristic curve is compared with a constant-voltage charging voltage threshold and a constant-current charging voltage threshold to determine the combination of charging modes of the first mobile device and the second mobile device.

36. The charging system of claim 33, wherein in the case of step S21, the conversion control circuit further controls the switching power conversion circuit according to the following steps: S3: Adjusting the supply voltage to charge the first battery in each mobile device according to the combination of the charging modes of the first mobile device and the second mobile device and the information indicated by the at least one mode turning point, thereby reducing the voltage across each mobile charging circuit to reduce power loss.

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