A mobile power supply device and control method supporting dual-path wireless fast charging

Abstract

The application discloses a kind of mobile power supply devices and control methods supporting double-path wireless fast charging, the device includes: input-output module, bidirectional DCDC module, control module, wireless charging module and battery module;The node 1 of bidirectional DCDC module is connected to input-output module via first switch, node 3 is connected to battery module via third switch;The node 2 of wireless charging module is connected to node 1 via second switch, is connected to battery module via fourth switch and third switch;Control module carries out on-off control to first switch, second switch, third switch and fourth switch.Thereby, corresponding charging and discharging path is planned for different charging and discharging modes, other paths are turned off when supplying wireless charging by external power supply, wireless charging module is stably supplied with accurate voltage, to ensure that wireless fast charging can be realized in the case of plugging and not plugging, eliminate the phenomenon that charging is slower after plugging, significantly improve user experience.

Description

Technical Field

[0001] This invention relates to the field of working mode control technology, and in particular to a mobile power supply device and control method that supports dual-path wireless fast charging. Background Technology

[0002] With the popularization of wireless charging technology, power banks have also been upgraded accordingly, resulting in wireless charging power banks with integrated wireless charging functionality. The current architecture of wireless charging power banks mainly includes: an input / output module, a bidirectional DC-DC converter module, a control module, a wireless charging module, and a battery pack module. The wireless charging module is connected in parallel with the input / output module at node 1 of the bidirectional DC-DC converter module, and the battery pack module is connected to node 2 of the bidirectional DC-DC converter module. Based on this architecture, the wireless charging module can be powered by the battery pack module or by an adapter connected to the input / output module.

[0003] Wireless fast charging protocols such as Qi MPP require extremely precise adjustment of the supply voltage (e.g., in 20mV increments) to accurately control power transmission and achieve efficient fast charging. However, adapters typically provide fixed voltage levels such as 5V, 9V, and 12V, which are directly applied to node 1 to power the wireless charging module. These fixed voltage levels cannot meet the precise voltage regulation requirements of wireless fast charging protocols. As a result, the wireless charging module can only operate in a lower charging power mode of 5W or 10W, and cannot activate the 15W or higher power fast charging mode. This causes the charging to be slower after the adapter is plugged in, which violates the normal usage logic of electronic products and seriously affects the user experience. Summary of the Invention

[0004] Embodiment 1 of the present invention discloses a mobile power bank device supporting dual-path wireless fast charging, specifically comprising: Input / output module, bidirectional DC-DC module, control module, wireless charging module and battery pack module; The bidirectional DC-DC module has node 1 and node 3. Node 1 is connected to the input / output module via a first switch Q1, and node 3 is connected to the battery pack module via a third switch Q3. The wireless charging module includes a node 2, which is connected to node 1 of the bidirectional DC-DC module via a second switch Q2, and the node 2 is connected to the battery pack module via a fourth switch Q4 and a third switch Q3. The control module performs on / off control on the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4; The bidirectional DC-DC module is used, under the control of the control module, to convert the fixed voltage level connected to the input / output module into the precise voltage required for the wireless charging module to perform fast charging. In wireless charging mode, the control module turns on the second switch Q2 and the third switch Q3, and turns off the first switch Q1 and the fourth switch Q4, so that the battery pack module supplies power to the wireless charging module through the bidirectional DC-DC module; In wired charging mode, the control module turns on the first switch Q1 and the fourth switch Q4, and turns off the second switch Q2 and the third switch Q3, so that the input / output module supplies power to the wireless charging module through the bidirectional DC-DC module.

[0005] As an optional implementation, in standby mode, the control module turns on the third switch Q3, turns off the first switch Q1, the second switch Q2 and the fourth switch Q4, and monitors whether the input / output module is connected to the adapter.

[0006] As an optional implementation, if the input / output module is detected to be connected to the adapter in standby mode, then the presence of a wireless load is detected to trigger the operation of the wireless charging module. If a wireless load is present, the control module turns on the first switch Q1 and the fourth switch Q4, and turns off the second switch Q2 and the third switch Q3. The bidirectional DC-DC module converts the fixed voltage at node 1 into a precise voltage, and transmits it to the wireless charging module via node 3 and node 2 to perform wireless fast charging on the wireless load.

[0007] As an optional implementation, if it is detected that the input / output module is connected to the adapter in standby mode, and it is detected that there is no wireless load to trigger the operation of the wireless charging module, then the control module turns on the first switch Q1 and the third switch Q3, and turns off the second switch Q2 and the fourth switch Q4. The bidirectional DC-DC module transmits the fixed voltage at node 1 to the battery pack module through node 3 to perform charging.

[0008] As an optional implementation, if it is detected that the input / output module is not connected to the adapter in standby mode, then it is detected whether there is a wireless load that triggers the operation of the wireless charging module; If a wireless load exists, determine whether a wired load is connected to the input / output module. If there is a wireless load but no wired load, the control module turns on the second switch Q2 and the third switch Q3, and turns off the first switch Q1 and the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module through node 3, and after voltage regulation and rectification, supplies precise voltage to the wireless charging module through nodes 1 and 2.

[0009] As an optional implementation, if it is detected in standby mode that the input / output module is not connected to the adapter, and there is a wired load as well as a wireless load, then the control module turns on the first switch Q1, the second switch Q2 and the third switch Q3, and turns off the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module through node 3, and after voltage regulation and rectification, supplies a normal 5V voltage to the input / output module through node 1, and supplies a normal 5V voltage to the wireless charging module through nodes 1 and 2.

[0010] As an optional implementation, if it is detected that the input / output module is not connected to the adapter in the standby state and there is no wireless load to trigger the operation of the wireless charging module, then it is detected whether there is a wired load connected to the input / output module. If a wired load exists, the control module turns on the first switch Q1 and the third switch Q3, and turns off the second switch Q2 and the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module through node 3, and supplies power to the wired load through node 1 and the input / output module.

[0011] As an optional implementation, if it is detected that the input / output module is not connected to the adapter in the standby state, and there is no wireless load to trigger the operation of the wireless charging module, and there is no wired load connected to the input / output module, then the standby state is maintained.

[0012] As an optional implementation, the wireless charging module is a wireless power transmission device based on the Qi protocol. In normal charging mode, it operates based on a fixed voltage level, and in fast charging mode, it operates based on a precise voltage with a voltage adjustment step of no more than 20mV.

[0013] Embodiment 2 of the present invention discloses a control method, characterized in that it includes: a. In standby mode, check if the adapter is connected to the input / output module. If yes, proceed to step b; otherwise, proceed to step e. b. Check if the wireless charging module is triggered to run by the wireless load. If yes, proceed to step c; otherwise, proceed to step d. c. Turn on the first switch Q1 and the fourth switch Q4, and turn off the second switch Q2 and the third switch Q3. The bidirectional DC-DC module draws power from the input / output module and converts the output voltage to the wireless charging module. The wireless charging module performs wireless fast charging on the wireless load. d. Turn on the first switch Q1 and the third switch Q3, and turn off the second switch Q2 and the fourth switch Q4. The bidirectional DC-DC module draws power from the input / output module and charges the battery pack module. e. Detect whether the wireless charging module is triggered to run by the wireless load. If yes, proceed to step f; otherwise, proceed to step i. f. Detect whether the input / output module is connected to a wired load. If yes, proceed to step g; otherwise, proceed to step h. g. Turn on the first switch Q1, the second switch Q2 and the third switch Q3, and turn off the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module to power the input / output module and the wireless charging module. h. Turn on the second switch Q2 and the third switch Q3, and turn off the first switch Q1 and the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module to power the wireless charging module. i. Detect whether the input / output module is connected to a wired load. If yes, proceed to step j; otherwise, reset and proceed to step a. j. Turn on the first switch Q1 and the third switch Q3, and turn off the second switch Q2 and the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module to supply power to the input / output module.

[0014] Compared with the prior art, this embodiment has the following beneficial effects: In this embodiment, corresponding charging and discharging paths are planned for different charging and discharging modes. When wireless charging is supplied by an external power source, other paths are shut off to ensure a stable and accurate voltage is supplied to the wireless charging module. This ensures that wireless fast charging can be achieved whether the device is plugged in or not, eliminating the phenomenon that charging is slower when plugged in and significantly improving the user experience. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the system structure of a mobile power supply device that supports dual-path wireless fast charging, as disclosed in this embodiment. Figure 2 This is a schematic diagram of the workflow of a control method disclosed in this embodiment. Detailed Implementation

[0017] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1 Please see Figure 1 This embodiment discloses a mobile power bank device that supports dual-path wireless fast charging, comprising: Input / output module, bidirectional DC-DC module, control module, wireless charging module and battery pack module; The bidirectional DC-DC module has node 1 and node 3. Node 1 is connected to the input / output module via the first switch Q1, and node 3 is connected to the battery pack module via the third switch Q3. The wireless charging module has a node 2, which is connected to node 1 of the bidirectional DC-DC module via a second switch Q2, and the node 2 is connected to the battery pack module via a fourth switch Q4 and a third switch Q3. The control module performs on / off control on the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4; The bidirectional DC-DC module is used, under the control of the control module, to convert the fixed voltage level connected to the input / output module into the precise voltage required for the wireless charging module to perform fast charging. In wireless charging mode, the control module turns on the second switch Q2 and the third switch Q3, and turns off the first switch Q1 and the fourth switch Q4, so that the battery pack module supplies power to the wireless charging module through the bidirectional DC-DC module. In wired charging mode, the control module turns on the first switch Q1 and the fourth switch Q4, and turns off the second switch Q2 and the third switch Q3, so that the input / output module supplies power to the wireless charging module through the bidirectional DC-DC module.

[0019] In this embodiment, when wireless charging is performed by connecting an adapter, other unrelated pathways are shut off. The bidirectional DC-DC module modulates the fixed voltage input from the adapter into a precise voltage and transmits it to the wireless charging module. The wireless charging module then stably performs fast wireless charging on the wireless load, preventing situations where plugging in the power results in slower charging and significantly improving the user experience.

[0020] As an optional implementation, in standby mode, the control module turns on the third switch Q3, turns off the first switch Q1, the second switch Q2 and the fourth switch Q4, and monitors whether the input / output module is connected to the adapter.

[0021] Specifically, in standby mode, the system is maintained solely by the battery module, which monitors whether external devices are connected to the system's inputs / outputs. Based on this, the detection logic is triggered to perform corresponding operations such as battery charging, wireless battery charging, wired battery charging, plugged-in wireless charging, plugged-in wired charging, and simultaneous wired and wireless charging.

[0022] As an optional implementation, if the input / output module is detected to be connected to the adapter in standby mode, then the presence of a wireless load is detected to trigger the operation of the wireless charging module. If a wireless load is present, the control module turns on the first switch Q1 and the fourth switch Q4, and turns off the second switch Q2 and the third switch Q3. The bidirectional DC-DC module converts the fixed voltage at node 1 into a precise voltage, and transmits it to the wireless charging module via node 3 and node 2 to perform wireless fast charging on the wireless load.

[0023] Here, when the adapter is plugged in and wireless charging is performed only, an independent power supply path is constructed based on the input / output module, the bidirectional DC-DC module, and the wireless charging module.

[0024] As an optional implementation, the wireless charging module is a wireless power transmission device based on the Qi protocol. In normal charging mode, it operates based on a fixed voltage level, and in fast charging mode, it operates based on a precise voltage with a voltage regulation step of no more than 20mV.

[0025] The bidirectional DC-DC module provides a stable and precise voltage to the wireless charging module, enabling the wireless charging module to achieve stable wireless fast charging. This ensures that wireless fast charging can be achieved whether the device is plugged in or not, significantly improving the user experience.

[0026] As an optional implementation, if it is detected that the input / output module is connected to the adapter in standby mode, and it is detected that there is no wireless load to trigger the operation of the wireless charging module, then the control module turns on the first switch Q1 and the third switch Q3, and turns off the second switch Q2 and the fourth switch Q4. The bidirectional DC-DC module transmits the fixed voltage at node 1 to the battery pack module through node 3 to perform charging.

[0027] Here, an independent path is constructed for the charging state.

[0028] As an optional implementation, if it is detected that the input / output module is not connected to the adapter in standby mode, then it is detected whether there is a wireless load that triggers the wireless charging module to operate; If a wireless load exists, determine if a wired load is connected to the input / output module. If there is a wireless load but no wired load, the control module turns on the second switch Q2 and the third switch Q3, and turns off the first switch Q1 and the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module through node 3, and after voltage regulation and rectification, supplies precise voltage to the wireless charging module through nodes 1 and 2.

[0029] Here, the battery module powers the wireless charger, enabling fast wireless charging without the need for a power cord.

[0030] As an optional implementation, if it is detected that the input / output module is not connected to the adapter in the standby state, and there is a wired load as well as a wireless load, the control module turns on the first switch Q1, the second switch Q2 and the third switch Q3, and turns off the fourth switch Q4. The bidirectional DC-DC module draws power from the battery module through node 3, and after voltage regulation and rectification, supplies a 5V ordinary voltage to the input / output module through node 1, and supplies a 5V ordinary voltage to the wireless charging module through nodes 1 and 2.

[0031] Here, the battery module supplies power to both the input / output module and the wireless charging module simultaneously, enabling both wired and wireless charging to be performed at the same time.

[0032] As an optional implementation, if it is detected that the input / output module is not connected to the adapter in the standby state and there is no wireless load to trigger the operation of the wireless charging module, then it is detected whether there is a wired load connected to the input / output module. If a wired load is present, the control module turns on the first switch Q1 and the third switch Q3, and turns off the second switch Q2 and the fourth switch Q4. The bidirectional DC-DC module draws power from the battery module through node 3, and supplies power to the wired load through node 1 and the input / output module.

[0033] Here, the battery module supplies power to the input / output module, enabling wired output charging.

[0034] As an optional implementation, if it is detected that the input / output module is not connected to the adapter in the standby state, and there is no wireless load to trigger the operation of the wireless charging module, and there is no wired load connected to the input / output module, then the standby state is maintained.

[0035] If it is detected that no adapter, no wired load, and no wireless load are connected, it indicates that no operation is being performed at this time, and the system will continue to maintain standby mode.

[0036] In this embodiment, corresponding charging and discharging paths are planned for different charging and discharging modes, such as battery storage, wireless battery charging, wired battery charging, plugged-in wireless charging, plugged-in wired charging, and simultaneous wired and wireless charging. Among them, when wireless charging is supplied by an external power source, other paths are shut off to ensure a stable and accurate voltage supply to the wireless charging module. This ensures that wireless fast charging can be achieved whether the module is plugged in or not, eliminating the phenomenon that charging is slower when plugged in and significantly improving the user experience.

[0037] Example 2 Please see Figure 2 The control method disclosed in this embodiment includes: a. In standby mode, check if the adapter is connected to the input / output module. If yes, proceed to step b; otherwise, proceed to step e.

[0038] b. Check if the wireless charging module is triggered to run by the wireless load. If yes, proceed to step c; otherwise, proceed to step d.

[0039] c. Turn on the first switch Q1 and the fourth switch Q4, and turn off the second switch Q2 and the third switch Q3. The bidirectional DC-DC module draws power from the input / output module and converts the output voltage to the wireless charging module. The wireless charging module performs wireless fast charging on the wireless load.

[0040] This embodiment demonstrates the working condition where the power bank is plugged into an adapter and the power bank performs wireless fast charging on the wireless load.

[0041] Under this operating condition, other unrelated pathways are shut down, and the bidirectional DC-DC module modulates the fixed-level voltage input to the adapter into a precise voltage, which is then transmitted to the wireless charging module. Based on this, the wireless charging module stably performs wireless fast charging on the wireless load, preventing the situation where plugging in the power results in slower charging, thus significantly improving the user experience.

[0042] d. Turn on the first switch Q1 and the third switch Q3, and turn off the second switch Q2 and the fourth switch Q4. The bidirectional DC-DC module draws power from the input / output module and charges the battery module.

[0043] This embodiment demonstrates the working condition where the mobile power device is plugged into an adapter to charge its internal battery module.

[0044] e. Detect whether the wireless charging module is triggered to run by the wireless load. If yes, proceed to step f; otherwise, proceed to step i.

[0045] f. Check if the input / output module is connected to a wired load. If yes, proceed to step g; otherwise, proceed to step h.

[0046] g. Turn on the first switch Q1, the second switch Q2 and the third switch Q3, and turn off the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module to power the input / output module and the wireless charging module.

[0047] This embodiment demonstrates the working condition where the mobile power device charges both wired and wireless loads simultaneously based on its internal battery module.

[0048] Understandably, due to the limited power supply performance of the battery module, the voltage supplied to the wireless charging module is insufficient to support wireless fast charging when multiple devices are charging. Therefore, it can only supply a normal 5V voltage to both wired and wireless loads simultaneously.

[0049] h) Turn on the second switch Q2 and the third switch Q3, and turn off the first switch Q1 and the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module to power the wireless charging module.

[0050] This embodiment demonstrates the working condition of the mobile power device wirelessly fast charging a wireless load based on its internal battery module.

[0051] i. Check if the input / output module is connected to a wired load. If yes, proceed to step j; otherwise, reset and proceed to step a.

[0052] j. Turn on the first switch Q1 and the third switch Q3, and turn off the second switch Q2 and the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module to supply power to the input and output modules.

[0053] This embodiment demonstrates the working condition of the mobile power device charging a wired load via its internal battery module.

[0054] It is evident that by planning corresponding charging and discharging paths for different charging and discharging modes, unrelated modules will not interfere with the operating modules, effectively ensuring that the mobile power supply device operates in the best condition under various working conditions.

Claims

1. A mobile power bank device supporting dual-path wireless fast charging, characterized in that, include: Input / output module, bidirectional DC-DC module, control module, wireless charging module and battery pack module; The bidirectional DC-DC module has node 1 and node 3. Node 1 is connected to the input / output module via a first switch Q1, and node 3 is connected to the battery pack module via a third switch Q3. The wireless charging module includes a node 2, which is connected to node 1 of the bidirectional DC-DC module via a second switch Q2, and the node 2 is connected to the battery pack module via a fourth switch Q4 and a third switch Q3. The control module performs on / off control on the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4; The bidirectional DC-DC module is used, under the control of the control module, to convert the fixed voltage level connected to the input / output module into the precise voltage required for the wireless charging module to perform fast charging. In wireless charging mode, the control module turns on the second switch Q2 and the third switch Q3, and turns off the first switch Q1 and the fourth switch Q4, so that the battery pack module supplies power to the wireless charging module through the bidirectional DC-DC module; In wired charging mode, the control module turns on the first switch Q1 and the fourth switch Q4, and turns off the second switch Q2 and the third switch Q3, so that the input / output module supplies power to the wireless charging module through the bidirectional DC-DC module.

2. A mobile power bank device supporting dual-path wireless fast charging according to claim 1, characterized in that, include: In standby mode, the control module turns on the third switch Q3, turns off the first switch Q1, the second switch Q2 and the fourth switch Q4, and monitors whether the input / output module is connected to the adapter.

3. A mobile power bank device supporting dual-path wireless fast charging according to claim 2, characterized in that, If the input / output module is found to be connected to the adapter in standby mode, then check whether there is a wireless load that triggers the wireless charging module to operate; If a wireless load is present, the control module turns on the first switch Q1 and the fourth switch Q4, and turns off the second switch Q2 and the third switch Q3. The bidirectional DC-DC module converts the fixed voltage at node 1 into a precise voltage, and transmits it to the wireless charging module via node 3 and node 2 to perform wireless fast charging on the wireless load.

4. A mobile power bank device supporting dual-path wireless fast charging according to claim 3, characterized in that, include: If, in standby mode, the input / output module is connected to the adapter and no wireless load is detected to trigger the operation of the wireless charging module, then the control module turns on the first switch Q1 and the third switch Q3, and turns off the second switch Q2 and the fourth switch Q4. The bidirectional DC-DC module transmits the fixed voltage at node 1 to the battery pack module via node 3 to perform charging.

5. A mobile power bank device supporting dual-path wireless fast charging according to claim 2, characterized in that, If it is detected that the input / output module is not connected to the adapter in standby mode, then detect whether there is a wireless load that triggers the wireless charging module to operate; If a wireless load exists, determine whether a wired load is connected to the input / output module. If there is a wireless load but no wired load, the control module turns on the second switch Q2 and the third switch Q3, and turns off the first switch Q1 and the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module through node 3, and after voltage regulation and rectification, supplies precise voltage to the wireless charging module through nodes 1 and 2.

6. A mobile power bank device supporting dual-path wireless fast charging according to claim 5, characterized in that, include: If, in standby mode, it is detected that the input / output module is not connected to the adapter, and there is both a wireless load and a wired load, then the control module turns on the first switch Q1, the second switch Q2, and the third switch Q3, and turns off the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module through node 3, and after voltage regulation and rectification, supplies a 5V ordinary voltage to the input / output module through node 1, and supplies a 5V ordinary voltage to the wireless charging module through nodes 1 and 2.

7. A mobile power bank device supporting dual-path wireless fast charging according to claim 5, characterized in that, If it is detected that the input / output module is not connected to the adapter in standby mode and there is no wireless load to trigger the operation of the wireless charging module, then it is detected whether there is a wired load connected to the input / output module. If a wired load exists, the control module turns on the first switch Q1 and the third switch Q3, and turns off the second switch Q2 and the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module through node 3, and supplies power to the wired load through node 1 and the input / output module.

8. A mobile power bank device supporting dual-path wireless fast charging according to claim 7, characterized in that, include: If, in standby mode, it is determined that the input / output module is not connected to the adapter, and there is no wireless load to trigger the operation of the wireless charging module, and there is no wired load connected to the input / output module, then the standby mode is maintained.

9. A mobile power bank device supporting dual-path wireless fast charging according to claim 1, characterized in that, The wireless charging module is a wireless power transmission device based on the Qi protocol. In normal charging mode, it operates based on a fixed voltage level, and in fast charging mode, it operates based on a precise voltage with a voltage adjustment step of no more than 20mV.

10. A control method, characterized in that, The method includes: a. In standby mode, check if the adapter is connected to the input / output module. If yes, proceed to step b; otherwise, proceed to step e. b. Check if the wireless charging module is triggered to run by the wireless load. If yes, proceed to step c; otherwise, proceed to step d. c. Turn on the first switch Q1 and the fourth switch Q4, and turn off the second switch Q2 and the third switch Q3. The bidirectional DC-DC module draws power from the input / output module and converts the output voltage to the wireless charging module. The wireless charging module performs wireless fast charging on the wireless load. d. Turn on the first switch Q1 and the third switch Q3, and turn off the second switch Q2 and the fourth switch Q4. The bidirectional DC-DC module draws power from the input / output module and charges the battery pack module. e. Detect whether the wireless charging module is triggered to run by the wireless load. If yes, proceed to step f; otherwise, proceed to step i. f. Detect whether the input / output module is connected to a wired load. If yes, proceed to step g; otherwise, proceed to step h. g. Turn on the first switch Q1, the second switch Q2 and the third switch Q3, and turn off the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module to power the input / output module and the wireless charging module. h. Turn on the second switch Q2 and the third switch Q3, and turn off the first switch Q1 and the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module to power the wireless charging module. i. Detect whether the input / output module is connected to a wired load. If yes, proceed to step j; otherwise, reset and proceed to step a. j. Turn on the first switch Q1 and the third switch Q3, and turn off the second switch Q2 and the fourth switch Q4. The bidirectional DC-DC module draws power from the battery pack module to supply power to the input / output module.

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