Tablet computer charging cabinet

Abstract

The invention discloses a tablet computer charging cabinet which comprises a charging cabinet body, a plurality of charging placement grooves distributed side by side are formed in the charging cabinet body, an inclined supporting partition plate is arranged on the same side of each charging placement groove, and a wireless transmitting circuit is arranged in each supporting partition plate. The wireless transmitting circuit is electrically connected with a main control board arranged in the charging cabinet body; the charging device comprises a plurality of charging bases, each charging base is provided with an installation groove used for installing a tablet personal computer, a charging head matched with a charging port of the tablet personal computer is arranged in each installation groove, and a wireless receiving circuit is arranged in each charging base and electrically connected with the corresponding charging head. According to the invention, a plurality of tablet personal computers are charged, the charging convenience and the use efficiency are improved, the overall structure is compact, and the miniaturization use requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic product charging, and in particular to a tablet computer charging cabinet. Background Art

[0002] With continuous technological advancements and decreasing costs, wireless charging technology is gradually becoming popular in various electronic products, including mobile phones, tablets, and laptops, allowing more users to enjoy its convenience. Wireless charging makes electronic products more neat and beautiful, eliminating the trouble of tangled cables and bringing a cleaner appearance to modern homes and offices. Wireless chargers use the principle of electromagnetic induction to charge. With a coil placed at both the transmitting and receiving ends, the transmitting coil emits an electromagnetic signal under the influence of electricity. The receiving coil receives the electromagnetic signal and converts it into an electric current, thus achieving wireless charging.

[0003] Currently, existing wireless tablet chargers can only wirelessly charge a single tablet and cannot meet the need to charge multiple tablets simultaneously. In some scenarios, such as tablet manufacturing, conference rooms, classrooms, training institutions, and internet cafes, multiple tablets may need to be charged simultaneously. In these situations, existing wireless chargers are not up to the task, forcing users to prepare multiple chargers or resort to wired charging, which is inconvenient, unsightly, and increases cost and space. Summary of the Invention

[0004] In order to overcome the problem in the prior art that wireless chargers for tablet computers cannot wirelessly charge multiple tablet computers at the same time, the present invention provides a tablet computer charging cabinet.

[0005] The technical solution of the present invention is as follows: A tablet charging cabinet, comprising: A charging cabinet body, wherein the charging cabinet body is provided with a plurality of charging placement slots distributed side by side, and an inclined support partition is provided on the same side of each charging placement slot, and a wireless transmission circuit is provided in the support partition, and the wireless transmission circuit is electrically connected to the main control board provided inside the charging cabinet body; Multiple charging bases, each having a mounting slot for mounting a tablet computer, a charging head configured to mate with the tablet computer's charging port, and a wireless receiving circuit electrically connected to the charging head. When the charging base is placed in the charging placement slot along the supporting partition at an angle, the wireless receiving coil of the wireless receiving circuit can receive the electromagnetic signal released by the wireless transmitting coil of the wireless transmitting circuit.

[0006] As a preferred solution of the present invention, the width of the bottom of the charging slot is greater than the thickness of the charging base.

[0007] As a preferred solution of the present invention, the charging cabinet body is provided with an AC input terminal for connecting to an external power supply, and the main control board is provided with an input rectifier and filter circuit, a transformer, an output rectifier and filter circuit and a multi-channel BUCK power supply circuit. The AC input terminal is electrically connected to the input end of the input rectifier and filter circuit, the output end of the input rectifier and filter circuit is electrically connected to the primary winding of the transformer, the secondary winding of the transformer is electrically connected to the input end of the output rectifier and filter circuit, and the output end of the output rectifier and filter circuit is electrically connected to the multi-channel wireless transmission circuit through the multi-channel BUCK power supply circuit, and the BUCK power supply circuit corresponds one-to-one to the wireless transmission circuit.

[0008] As a preferred embodiment of the present invention, the BUCK power supply circuit includes a first power management chip U4, a capacitor EC6, a capacitor EC9, a capacitor C11, a capacitor C13, a capacitor C30, a capacitor C35, a resistor R21, a resistor R28, a resistor R29, a resistor R30, a resistor R58, and an inductor L3. The BST pin of the first power management chip U4 passes through the resistor R29 and the capacitor C11 in sequence, and is electrically connected to the SW pin of the first power management chip U4, one end of the resistor R58, and one end of the inductor L3 respectively. The other end of the resistor R58 is electrically connected to the negative electrode of the capacitor EC9, one end of the resistor R30, and the ground after passing through the capacitor C30. The other end of the resistor R30 is electrically connected to the first The CS pin of a power management chip U4 is electrically connected, and the other end of the inductor L3 is respectively electrically connected to the positive electrode of the capacitor EC9, one end of the resistor R28 and the corresponding wireless transmission circuit. The VIN pin of the first power management chip U4 is respectively electrically connected to the output end of the output rectifier filter circuit, the positive electrode of the capacitor EC9 and one end of the capacitor C35. The FB pin of the first power management chip U4 is respectively electrically connected to one end of the resistor R21, one end of the capacitor C13 and the other end of the resistor R28. The negative electrode of the capacitor EC9, the other end of the capacitor C35, the other end of the resistor R21, the other end of the capacitor C13 and the GND pin of the first power management chip U4 are all grounded.

[0009] As a preferred solution of the present invention, one end of the AC input terminal connected to the input rectifier and filter circuit is wrapped with conductive cloth, and the conductive cloth is grounded.

[0010] As a preferred solution of the present invention, the AC input terminal is electrically connected to the input end of the input rectifier and filter circuit through an RC absorption circuit.

[0011] As a preferred solution of the present invention, the wireless transmitting circuit includes a wireless transmitting chip and a wireless transmitting coil, and the wireless transmitting chip is electrically connected to the input end of the wireless transmitting coil and the output end of a corresponding BUCK power supply circuit respectively.

[0012] As a preferred solution of the present invention, the wireless transmitting circuit further includes a charging indicator light, the wireless transmitting chip is electrically connected to the charging indicator light, and the charging indicator light is arranged outside a corresponding one of the charging slots.

[0013] As a preferred solution of the present invention, the grounding points of all the wireless transmitting circuits are connected to the same point.

[0014] As a preferred solution of the present invention, the wireless receiving circuit includes a wireless receiving coil, a wireless receiving chip, an MCU chip and a second power management chip. The wireless receiving chip is electrically connected to the wireless receiving coil, the MCU chip and the second power management chip respectively, and the second power management chip is also electrically connected to the MCU chip and the charging head.

[0015] As a preferred embodiment of the present invention, one end of the bottom of each charging slot is recessed to form a limiting slot, and a guide hole communicating with the limiting slot is transversely opened on the same side of each limiting slot. A limiting portion that can be limited to the limiting slot is provided on the side of the charging base that contacts the charging slot, and a limiting hole is provided on the limiting portion. When the limiting portion is limited in the limiting slot, the limiting hole is aligned with the guide hole. A locking rod is provided in the charging cabinet body, and the locking rod has a first position and a second position. When the locking rod is in the first position, the locking end of the locking rod passes through the guide holes of all the limiting grooves and enters all the limiting grooves; when the locking rod is in the second position, the locking end of the locking rod is disengaged from the guide holes of all the limiting grooves.

[0016] As a preferred solution of the present invention, the locking end of the locking rod is provided with a plurality of locking rods distributed side by side, and the locking rods correspond to the limiting grooves one by one. When the locking rod is located at the first position, each of the locking rods passes through the guide hole of the corresponding limiting groove and enters the limiting groove; when the locking rod is located at the second position, each of the locking rods is disengaged from the corresponding limiting groove.

[0017] As a preferred solution of the present invention, the end of the locking rod is conical.

[0018] As a preferred solution of the present invention, the locking rod and the locking rod are parallel to each other, and a connecting rod is provided between the locking rod and the locking rod.

[0019] As a preferred solution of the present invention, reinforcing side ribs are provided between the connecting rod and the locking rod.

[0020] As a preferred solution of the present invention, a paddle is provided on the locking rod, and a sliding groove is provided on the charging cabinet body. The paddle passes through the sliding groove and extends out of the charging cabinet body and can slide left and right along the sliding groove. The paddle drives the locking rod to switch between the first position and the second position.

[0021] As a preferred embodiment of the present invention, a first lock hole is formed on one end of the paddle extending from the outside of the charging cabinet body, and a first locking plate is provided on one side of the sliding groove of the charging cabinet body, and a second lock hole is formed on the first locking plate; The tablet charging cabinet also includes: A U-shaped lock, when the locking rod is located at the first position, the U-shaped lock cooperates with the first locking hole and the second locking hole to lock the position of the paddle.

[0022] As a preferred solution of the present invention, the U-shaped lock is a fingerprint U-shaped lock, a mechanical password U-shaped lock or a key U-shaped lock.

[0023] As a preferred solution of the present invention, a plurality of lock rod brackets distributed side by side are provided in the charging cabinet body, and the lock rod is mounted on all the lock rod brackets and can slide left and right along the lock rod bracket.

[0024] As a preferred solution of the present invention, the locking rod is provided with a limiting ridge for limiting the rotation of the locking rod, the locking rod bracket is provided with a mounting hole that cooperates with the locking rod, and one side of the mounting hole is provided with a limiting sliding hole that cooperates with the limiting ridge for limiting the rotation of the locking rod.

[0025] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up multiple charging slots distributed side by side on the charging cabinet body and matching the charging base, the problem of existing tablet wireless chargers can only charge a single device is solved. It can charge multiple tablets at the same time in places such as conference rooms and classrooms, improving charging convenience and usage efficiency. 2. The wireless charging method avoids the clutter caused by a large number of cables, making homes, offices and other places more tidy; the overall structure is compact and meets the needs of miniaturization; 3. The tilted support partition facilitates the placement of the charging base and allows the transmitting and receiving coils to be better aligned, ensuring the efficiency of electromagnetic signal transmission; 4. By adding a BUCK power supply circuit to each wireless transmission circuit on the main control board, each BUCK power supply circuit can independently provide a stable power supply for the corresponding wireless transmission circuit, making the working state of each wireless transmission circuit relatively independent, reducing the interference signal strength of each wireless transmission circuit and reducing mutual signal interference. When designing multi-channel wireless charging, there is no need to reserve too much space to avoid interference, so that the charging cabinet structure can be designed to be more compact and miniaturized. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a structural diagram of a charging cabinet body in one embodiment of the present invention; Figure 2 It is a front view of a charging base according to an embodiment of the present invention; Figure 3 This is a principle block diagram of a charging cabinet body in one embodiment of the present invention; Figure 4 1 is a principle block diagram of a wireless transmitting circuit in one embodiment of the present invention; Figure 5 This is a functional block diagram of a charging base according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the interior of a charging cabinet body in one embodiment of the present invention; Figure 7 1 is a circuit schematic diagram of a BUCK power supply circuit according to an embodiment of the present invention; Figure 8 This is a principle block diagram of a charging cabinet body in another embodiment of the present invention; Figure 9 A top view of a charging cabinet body according to an embodiment of the present invention; Figure 10 A top view of a locking rod according to an embodiment of the present invention; Figure 11 This is a rear view of the charging cabinet body in one embodiment of the present invention; Figure 12 This is a rear view of a charging cabinet body with a U-shaped lock in one embodiment of the present invention; Figure 132 is a side view of a locking rod bracket according to an embodiment of the present invention.

[0028] In the figure, 1. Charging cabinet body; 11. Charging slot; 111. Support partition; 112. Limit slot; 12. Wireless transmission circuit; 121. Wireless transmission coil; 122. Wireless transmission chip; 123. Charging indicator light; 13. Main control board; 131. Input rectifier and filter circuit; 132. Transformer; 133. Output rectifier and filter circuit; 134. Buck power supply circuit; 135. RC absorption circuit; 14. AC input terminal; 15. Conductive fabric; 16. Lock rod; 161. Locking rod; 162. Connecting rod 163. Reinforced side ribs; 164. Pick; 1641. First lock hole; 165. Limiting ridge; 17. Slide groove; 18. First lock piece; 181. Second lock hole; 19. Lock rod bracket; 191. Mounting hole; 192. Limiting slide hole; 2. Charging base; 21. Mounting slot; 22. Charging head; 23. Wireless receiving circuit; 231. Wireless receiving coil; 232. Wireless receiving chip; 233. MCU chip; 234. Second power management chip; 24. Limiting part; 241. Limiting hole; 3. U-shaped lock. DETAILED DESCRIPTION

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. It should also be noted that the embodiments described below are intended only to illustrate the present invention and are not intended to limit the present invention.

[0030] It should be noted that the terms "install", "set", "connect", "fix" and the like should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium; they can be internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. The indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the application is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly defined.

[0031] See also Figures 1 to 6 An embodiment of the present invention provides a tablet computer charging cabinet, comprising a charging cabinet body 1 and a plurality of matching charging bases 2. The charging cabinet body 1 is provided with a plurality of charging placement slots 11 distributed side by side, and an inclined support partition 111 is provided on the same side of each charging placement slot 11. A wireless transmitting circuit 12 is provided in the support partition 111, and the wireless transmitting circuit 12 is electrically connected to a main control board 13 provided inside the charging cabinet body 1. The charging base 2 is provided with a mounting slot 21 for mounting a tablet computer, and a charging head 22 that matches the charging port of the tablet computer is provided in the mounting slot 21. A wireless receiving circuit 23 is provided in the charging base 2, and the wireless receiving circuit 23 is electrically connected to the charging head 22.

[0032] Working principle: The tablet charging cabinet achieves wireless charging based on the principle of electromagnetic induction. During operation, the main control board 13 within the charging cabinet body 1 processes the incoming AC power to power the wireless transmitting circuit 12 within the support partition 111. When energized, the wireless transmitting coil 121 within the wireless transmitting circuit 12 emits an electromagnetic signal into the surrounding space. When the charging base 2 is tilted and placed within the charging slot 11 along the support partition 111, the wireless receiving coil 231 within the wireless receiving circuit 23 within the charging base 2 receives the electromagnetic signal, converts it into an electric current, and then connects to the charging head 22 to charge the tablet computer installed in the mounting slot 21 of the charging base 2.

[0033] The tablet computer charging cabinet of this embodiment solves the problem that existing tablet computer wireless chargers can only charge a single device by providing multiple charging placement slots 11 distributed side by side on the charging cabinet body 1 and cooperating with a matching charging base 2. It can charge multiple tablet computers at the same time in places such as conference rooms and classrooms, thereby improving charging convenience and usage efficiency; the use of wireless charging avoids the clutter caused by a large number of cables, making homes, offices and other places tidier; the overall structure is compact, meeting the needs of miniaturization; the inclined support partition 111 facilitates the placement of the charging base 2 and allows the transmitting and receiving coils to be better aligned, ensuring the efficiency of electromagnetic signal transmission.

[0034] In one embodiment, the bottom width of the charging slot 11 is greater than the thickness of the charging base 2, which can ensure that there is a certain gap between each charging coil to prevent crosstalk, avoid affecting the charging effect or even causing charging failure, and facilitate the removal and placement of the charging base 2 with a tablet computer installed, while preventing the tablet computer screen from being scratched.

[0035] See also Figure 3In one embodiment, the charging cabinet body 1 is provided with an AC input terminal 14 for connecting to an external power supply, and the main control board 13 is provided with an input rectifier and filter circuit 131, a transformer 132, an output rectifier and filter circuit 133 and a multi-channel buck power supply circuit 134. The AC input terminal 14 is electrically connected to the input end of the input rectifier and filter circuit 131, the output end of the input rectifier and filter circuit 131 is electrically connected to the primary winding of the transformer 132, the secondary winding of the transformer 132 is electrically connected to the input end of the output rectifier and filter circuit 133, and the output end of the output rectifier and filter circuit 133 is electrically connected to the multiple wireless transmission circuits 12 through the multiple buck power supply circuits 134. The buck power supply circuits 134 correspond one-to-one to the wireless transmission circuits 12. During wireless charging, the charging coils generate electromagnetic signals. If the coil spacing is too small, the electromagnetic signals generated by different charging coils can easily interfere with each other, affecting the charging performance of two adjacent tablets or even causing charging failure. This makes miniaturization impossible in actual multi-channel wireless charging designs. To address this, this embodiment adds a buck power supply circuit 134 to the main control board 13, corresponding to each wireless transmission circuit 12. Each buck power supply circuit 134 can independently provide a stable power supply to the corresponding wireless transmission circuit 12, ensuring that each wireless transmission circuit 12 operates relatively independently. This reduces the interference signal strength of each wireless transmission circuit and reduces signal interference between each other, allowing multiple wireless transmission circuits 12 to operate stably and normally, effectively solving the problems of crosstalk and mutual inductance between multiple wireless transmission circuits 12. Comparative testing shows that the interference signal strength of the buck power supply circuit 134 without independent power supply is approximately 200mV, while the interference signal strength of the buck power supply circuit 134 with the independent buck power supply circuit 134 is reduced to 40mV. When designing multi-channel wireless charging, the present invention no longer needs to reserve too much space to avoid interference, so that the charging cabinet structure can be designed to be more compact and miniaturized.

[0036] Furthermore, to effectively reduce electromagnetic interference, the grounding points of all wireless transmission circuits 12 are connected to the same point. This configuration minimizes the strength of the specific frequency signal generated by the wireless transmission coils 121 of all wireless transmission circuits 12 within the circuit loop. This further prevents the fixed frequency signal generated by the wireless transmission coils 121 from causing interference (i.e., EMI) on the main control board 13, thereby preventing conducted interference and excessive radiation from the main control board 13, ensuring the normal operation of the main control board 13 and the electromagnetic compatibility of the entire system.

[0037] See also Figure 7In one embodiment, the BUCK power supply circuit 134 includes a first power management chip U4, a capacitor EC6, a capacitor EC9, a capacitor C11, a capacitor C13, a capacitor C30, a capacitor C35, a resistor R21, a resistor R28, a resistor R29, a resistor R30, a resistor R58, and an inductor L3. The BST pin of the first power management chip U4 is electrically connected to the SW pin of the first power management chip U4, one end of the resistor R58, and one end of the inductor L3 through the resistor R29 and the capacitor C11 in sequence. The other end of the resistor R58 is electrically connected to the negative electrode of the capacitor EC9, one end of the resistor R30, and the ground through the capacitor C30. The other end of the resistor R30 is electrically connected to the ground. The CS pin of the first power management chip U4 is electrically connected, and the other end of the inductor L3 is electrically connected to the positive electrode of the capacitor EC9, one end of the resistor R28, and the corresponding wireless transmission circuit 12. The VIN pin of the first power management chip U4 is electrically connected to the output end of the output rectifier filter circuit 133, the positive electrode of the capacitor EC9, and one end of the capacitor C35. The FB pin of the first power management chip U4 is electrically connected to one end of the resistor R21, one end of the capacitor C13, and the other end of the resistor R28. The negative electrode of the capacitor EC9, the other end of the capacitor C35, the other end of the resistor R21, the other end of the capacitor C13, and the GND pin of the first power management chip U4 are all grounded. The output voltage of the BUCK power supply circuit 134 is 15V, and the output current is 1.33A; the output voltage of the transformer 132 is 20V, and the output current is 6A.

[0038] In the aforementioned buck power supply circuit 134, the buck power supply circuit 134, comprised of the first power management chip U4 and surrounding components such as capacitors, resistors, and inductors, converts the 20V output voltage of the transformer 132 into a 15V voltage suitable for the wireless transmitter circuit 12, enabling the wireless transmitter circuit 12 to operate in an appropriate voltage environment and ensuring stable and reliable performance. A voltage divider circuit, formed by resistors R21 and R28, connected to the FB pin of the first power management chip U4, monitors the output voltage in real time and adjusts the chip's operating state based on feedback signals to maintain output voltage stability. This ensures that the output voltage remains constant at 15V during load changes or input voltage fluctuations, providing a stable power supply for the wireless transmitter circuit 12. Components such as capacitors EC6, EC9, C11, C13, C30, and C35 act as filters and energy storage within the circuit, smoothing voltage fluctuations and reducing ripple and noise in the power supply, thereby providing a cleaner power supply. Resistor R30, acting as a current sensing resistor, is connected to the CS pin of the first power management chip U4. When the current in the circuit is too large, the CS pin detects the voltage change and the chip will take corresponding protection measures, such as reducing the output power or shutting down the circuit, thereby avoiding component damage caused by overcurrent and improving the safety and reliability of the circuit.

[0039] In a specific embodiment, the first power management chip U4 is LYF82031. The LYF82031 chip has high conversion efficiency and can efficiently convert input electrical energy into voltage and current suitable for use by the wireless transmission circuit 12. It can accurately control the output voltage and current and integrates multiple protection functions, such as overcurrent protection, overvoltage protection, undervoltage protection, and overheating protection.

[0040] In a specific embodiment, the transformer 132 is a flyback transformer, model IW3627. The flyback transformer IW3627 can adapt to a wide input voltage range and has good electrical isolation, efficient energy conversion performance, and stable output characteristics.

[0041] In one embodiment, the input voltage range of the AC input terminal 14 is 90V-264V, allowing the charging cabinet to adapt to the grid voltage in different regions, improving the versatility and applicability of the product. Whether in low-voltage areas or high-voltage areas, it can operate normally, providing convenience for users.

[0042] See also Figure 6 In one embodiment, the end of the AC input terminal 14 connected to the input rectifier and filter circuit 131 is wrapped with conductive cloth 15, and the conductive cloth 15 is grounded. In a tablet charging cabinet, when multiple wireless transmission circuits 12 operate simultaneously, they continuously generate electromagnetic signals of a certain frequency and intensity. The superposition of the electromagnetic signals generated by the multiple wireless transmission circuits 12 can interfere with the power supply of the main control board 13, causing conducted interference and radiation to exceed the standard. In this embodiment, by wrapping the end of the AC input terminal 14 connected to the input rectifier and filter circuit 131 with conductive cloth 15, and grounding the conductive cloth 15, a shielding layer is formed. The shielding layer can block the electromagnetic signals generated by the wireless transmission circuit 12 from entering the connection between the AC input terminal 14 and the input rectifier and filter circuit 131, thereby reducing the impact of electromagnetic interference on the power supply. By being grounded, the conductive cloth 15 directs the sensed electromagnetic interference signal to the ground, preventing the interference signal from propagating and accumulating in the circuit, helping to stabilize the power input, reduce noise and fluctuations in the power supply, and ensure the normal operation of the input rectifier and filter circuit 131.

[0043] See also Figure 8Furthermore, in one embodiment, the AC input terminal 14 is electrically connected to the input of the input rectifier and filter circuit 131 via an RC absorption circuit 135. The RC absorption circuit 135 consists of a resistor (R) and a capacitor (C). The RC absorption circuit 135 provides a filtering effect on the electromagnetic interference signals generated by the wireless transmitter circuit 12. The capacitor has a low impedance to the electromagnetic interference signal, bypassing it to ground, while the resistor limits the current, preventing excessive current from damaging the circuit. In this way, the RC absorption circuit 135 can further reduce the electromagnetic interference signals in the power input, improve the purity of the power supply, and reduce the impact of EMI interference on the entire tablet charging cabinet. Secondly, when the AC input terminal 14 is connected to a power source, a transient surge voltage may occur, which may damage or interfere with the input rectifier and filter circuit 131. When a surge voltage occurs, the RC absorption circuit 135 absorbs the surge energy through the charging of the capacitor and the current limiting of the resistor, reducing the surge voltage amplitude and protecting the input rectifier and filter circuit 131 from damage.

[0044] It should be noted that since the input rectifier filter circuit 131, transformer 132, output rectifier filter circuit 133 and RC absorption circuit 135 are existing technologies well known to those skilled in the art, the present invention does not improve them, so their specific circuit structure and working principle are not described in detail.

[0045] See also Figure 4 In one embodiment, the wireless transmitting circuit 12 includes a wireless transmitting coil 121 and a wireless transmitting chip 122. The wireless transmitting chip 122 is electrically connected to the input of the wireless transmitting coil 121 and the output of a corresponding buck power supply circuit 134. The wireless transmitting chip 122 cooperates with the wireless transmitting coil 121 to convert the electrical energy provided by the buck power supply circuit 134 into an electromagnetic signal and transmits it, thereby realizing wireless charging. By connecting to the corresponding buck power supply circuit 134, the wireless transmitting circuit 12 is ensured to have a stable power supply, thereby enabling the wireless transmitting coil 121 to continuously and stably transmit electromagnetic signals, providing energy to the wireless receiving circuit 23 in the charging base 2, thereby charging the tablet computer.

[0046] Furthermore, the wireless transmission circuit 12 also includes a charging indicator light 123. The wireless transmission chip 122 is electrically connected to the charging indicator light 123, and the charging indicator light 123 is disposed outside a corresponding charging slot 11. The charging indicator light 123 can reflect the operating status of the wireless transmission circuit 12 in real time. When the wireless transmission circuit 12 is operating normally and transmitting electromagnetic signals to the charging base 2, the charging indicator light 123 illuminates, allowing the user to intuitively see that the corresponding charging slot 11 is charging the tablet computer in the charging base 2. This provides the user with a clear charging status indication, allowing the user to easily understand whether the tablet computer is charging normally and whether charging is complete.

[0047] In a specific embodiment, the wireless transmitter chip 122 is MT5811. The MT5811 chip has good compatibility with other circuit components (such as the wireless transmitter coil 121 and the buck power supply circuit 134), enabling stable operation in the working environment of the charging cabinet, reducing the occurrence of failures caused by chip performance issues, and improving the reliability of the entire wireless charging system.

[0048] See also Figure 5 In one embodiment, the wireless receiving circuit 23 includes a wireless receiving coil 231, a wireless receiving chip 232, an MCU chip 233, and a second power management chip 234. The wireless receiving chip 232 is electrically connected to the wireless receiving coil 231, the MCU chip 233, and the second power management chip 234, respectively. The second power management chip 234 is also electrically connected to the MCU chip 233 and the charging head 22. The wireless receiving chip 232 is an MT5727; the MCU chip 233 is a PT32F003F4X6D; the second power management chip 234 is an SW3537 and supports the PD charging protocol; and the charging head 22 is a Type-C charging head 22. In the wireless receiving circuit 23, after the wireless receiving coil 231 receives the electromagnetic signal transmitted by the wireless transmitting circuit 12, the wireless receiving chip 232 (MT5727) can efficiently convert it into current. The second power management chip 234 (SW3537) supports the PD charging protocol and processes and regulates the converted current, providing the appropriate voltage and current to the charger 22 to charge the tablet. This combination ensures that the wireless receiving circuit 23 can stably receive and convert electromagnetic signals and effectively transmit electrical energy to the tablet, improving charging efficiency and stability. The MCU chip 233 (PT32F003F4X6D) intelligently controls and manages the operating status of the wireless receiving circuit 23. As a connection interface with the tablet, the Type-C charger offers broad compatibility and adaptability to a variety of tablet models, enhancing the product's versatility and applicability.

[0049] See also Figure 2 、 Figure 6 、 Figure 9 、 Figure 10 In one embodiment, one end of the bottom of each charging slot 11 is recessed to form a limiting slot 112. A guide hole communicating with the limiting slot 112 is transversely opened on the same side of each limiting slot 112. A limiting portion 24 capable of being limited to the limiting slot 112 is provided on the side of the charging base 2 that contacts the charging slot 11. The limiting portion 24 is provided with a limiting hole 241. When the limiting portion 24 is limited in the limiting slot 112, the limiting hole 241 is aligned with the guide hole. A locking rod 16 is provided in the charging cabinet body 1. The locking rod 16 has a first position and a second position. When the locking rod 16 is in the first position, the locking end of the locking rod 16 passes through the guide holes of all limiting slots 112 and enters all limiting slots 112. When the locking rod 16 is in the second position, the locking end of the locking rod 16 is disengaged from the guide holes of all limiting slots 112.

[0050] Through the limiting groove 112 and the guide hole at the bottom of the charging placement slot 11, and the limiting part 24 and the limiting hole 241 on the charging base 2 cooperate with each other, when the charging base 2 is placed in the charging placement slot 11, the limiting part 24 enters the limiting groove 112, and the limiting hole 241 is aligned with the guide hole; at this time, the locking rod 16 can pass through the corresponding guide hole and limiting hole 241 to lock the charging base 2 in the charging placement slot 11, so that the thief cannot easily remove the charging base 2 from the charging placement slot 11, thereby effectively preventing the charging base 2 from being stolen during use (such as when charging in public places such as conference rooms and classrooms) or when idle. The locking rod 16 provided in the charging cabinet body 1 can be used to lock or unlock multiple charging bases 2 at the same time, realizing centralized locking or unlocking management; when the locking rod 16 is in the first position, its locking end passes through the guide holes of all the limiting grooves 112 and enters the limiting groove 112, realizing locking of all the charging bases 2; when the locking rod 16 is in the second position, its locking end is disengaged from the guide hole, and all the charging bases 2 can be taken out. The setting of the limiting groove 112 and the limiting portion 24 can accurately fix the charging position of the charging base 2, ensure that the position of the charging base 2 in the charging placement slot 11 is accurate, and ensure that the transmitting and receiving coils of the wireless transmitting circuit 12 and the wireless receiving circuit 23 are better fitted and aligned, thereby improving the transmission efficiency of the electromagnetic signal, and thus improving the stability and efficiency of charging; in addition, during use, due to various reasons (such as human collision, equipment vibration, etc.), the charging base 2 may be displaced, thereby affecting the charging effect; locking the charging base 2 in the charging placement slot 11 by the locking rod 16 can effectively reduce the occurrence of such displacement, and avoid problems such as charging interruption or decreased charging efficiency due to changes in the position of the charging base 2.

[0051] See also Figure 6 、 Figure 10In one embodiment, the locking end of the locking lever 16 is provided with multiple locking levers 161 arranged side by side. These locking levers 161 correspond one-to-one with the retaining slots 112, enabling each charging base 2 to be independently and effectively locked. When the locking lever 16 is in the first position, each locking lever 161 passes through the guide hole of the corresponding retaining slot 112 and enters the retaining slot 112. When the locking lever 16 is in the second position, each locking lever 161 is released from the corresponding retaining slot 112. To charge the tablet computer, the user places the charging base 2 in the charging slot 11. At this point, the retaining portion 24 on the charging base 2 aligns with the retaining slot 112 at the bottom of the charging slot 11, and the retaining hole 241 on the retaining portion 24 also aligns with the guide hole of the retaining slot 112. However, when the locking lever 16 is in the second position, each locking lever 161 is released from the corresponding retaining slot 112, allowing the charging base 2 to be freely placed in the charging slot 11. The user moves the locking rod 16 from the second position to the first position as needed; at this time, each locking rod 161 of the locking rod 16 passes through the guide hole of the corresponding limiting groove 112 and enters the limiting groove 112; after the locking rod 161 enters the limiting groove 112, it cooperates with the limiting hole 241 on the limiting portion 24 to firmly lock the charging base 2 in the charging placement slot 11. When the tablet computer is fully charged or the charging base 2 needs to be removed, the user or administrator moves the locking rod 16 from the first position to the second position; during the movement, each locking rod 161 moves synchronously with the locking rod 16 and disengages from the corresponding limiting groove 112; when the locking rod 16 is in the second position, the locking rod 161 completely disengages from the limiting groove 112. At this time, the limiting portion 24 of the charging base 2 is no longer restricted by the locking rod 161, and the user can freely remove the charging base 2.

[0052] Furthermore, the end of the locking rod 161 is conical, and the conical end makes it easier for the locking rod 161 to be inserted into the guide hole of the limiting groove 112, making the locking operation smoother.

[0053] Furthermore, the locking rod 161 is parallel to the locking rod 16, and a connecting rod 162 is provided between the locking rod 161 and the locking rod 16. This ensures that when the locking rod 161 is inserted into and removed from the limiting slot 112, the locking rod 16 can stably drive the multiple locking rods 161 to move synchronously, thereby preventing the locking rods 161 from shaking or tilting. Furthermore, a reinforcing side rib 163 is provided between the connecting rod 162 and the locking rod 16. The reinforcing side rib 163 increases the connection strength between the connecting rod 162 and the locking rod 16, making the entire locking structure more stable.

[0054] See also Figure 6 、 Figure 10 、 Figure 11In one embodiment, the lock lever 16 is provided with a paddle 164, and the charging cabinet body 1 is provided with a slot 17. The paddle 164 extends through the slot 17 and extends outside the charging cabinet body 1. The paddle 164 can slide left and right along the slot 17. The user can directly operate the paddle 164 to drive the lock lever 16 to switch between the first position and the second position, thereby locking and unlocking the charging base 2. The cooperation between the paddle 164 and the slot 17 ensures the stability of the lock lever 16 when switching positions. The paddle 164 slides within the slot 17, limiting the movement trajectory of the lock lever 16, preventing the lock lever 16 from shaking or deflecting during operation, ensuring that the lock lever 16 can accurately switch between the first position and the second position, effectively locking or unlocking the charging base 2, and improving the reliability of the entire charging cabinet locking structure.

[0055] See also Figure 6 、 Figure 10 、 Figure 12 Furthermore, a first lock hole 1641 is provided on one end of the paddle 164 extending outside the charging cabinet body 1, and a first locking piece 18 is provided on one side of the slide groove 17 of the charging cabinet body 1, and a second lock hole 181 is provided on the first locking piece 18. The tablet charging cabinet also includes a U-shaped lock 3. When the locking rod 16 is in the first position, the U-shaped lock 3 cooperates with the first lock hole 1641 and the second lock hole 181 to lock the position of the paddle 164, further enhancing the locking effect of the charging base 2. The use of the U-shaped lock 3 increases the difficulty of illegal unlocking, preventing others from moving the paddle 164 without authorization, thereby preventing the charging base 2 from being stolen. For example, when using the charging cabinet in a public place, the U-shaped lock 3 can effectively protect the safety of the charging base 2 and the connected tablet computer.

[0056] In one embodiment, the U-shaped lock 3 is a fingerprint U-shaped lock, a mechanical password U-shaped lock, a key U-shaped lock, etc. The present invention does not limit this, and those skilled in the art can freely choose according to their own needs.

[0057] See also Figure 6 In one embodiment, the charging cabinet body 1 is provided with multiple, side-by-side locking rod brackets 19. The locking rod 16 is mounted on all of these brackets and can slide left and right along them. These multiple, side-by-side locking rod brackets 19 provide multiple support points for the locking rod 16, ensuring stable operation and, consequently, locking the charging base 2. When the locking rod 16 switches between the first and second positions, the multiple brackets evenly absorb the pressure from the locking rod 16, preventing bending or deformation of the locking rod 16 due to uneven force, thereby ensuring the proper operation and service life of the locking rod 16.

[0058] See also Figure 6 、 Figure 10 、 Figure 13Furthermore, the lock rod 16 is provided with a limiting ridge 165 that restricts the rotation of the lock rod 16. The lock rod bracket 19 is provided with a mounting hole 191 that cooperates with the lock rod 16. A limiting sliding hole 192 is provided on one side of the mounting hole 191 to cooperate with the limiting ridge 165 to restrict the rotation of the lock rod 16. When the lock rod 16 slides between the first position and the second position, the limiting ridge 165 slides within the limiting sliding hole 192, and can only move in the left and right directions, but cannot rotate. This ensures the accuracy of the lock rod 16 during operation, prevents the lock rod 16 from rotating and causing the lock rod 161 to be unable to accurately insert into the limiting groove 112, and ensures the reliability of locking and unlocking the charging base 2.

[0059] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

[0060] The above is an exemplary description of the patent of the present invention in conjunction with the accompanying drawings. It is obvious that the implementation of the patent of the present invention is not limited to the above-mentioned method. As long as various improvements are made by adopting the method concept and technical solution of the patent of the present invention, or the concept and technical solution of the patent of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A tablet charging cabinet, characterized in that: include: A charging cabinet body, wherein the charging cabinet body is provided with a plurality of charging placement slots distributed side by side, and an inclined support partition is provided on the same side of each charging placement slot, and a wireless transmission circuit is provided in the support partition, and the wireless transmission circuit is electrically connected to the main control board provided inside the charging cabinet body; Multiple charging bases, each having a mounting slot for mounting a tablet computer, a charging head configured to mate with the tablet computer's charging port, and a wireless receiving circuit electrically connected to the charging head. When the charging base is placed in the charging placement slot along the supporting partition at an angle, the wireless receiving coil of the wireless receiving circuit can receive the electromagnetic signal released by the wireless transmitting coil of the wireless transmitting circuit.

2. The tablet computer charging cabinet according to claim 1, characterized in that: The width of the bottom of the charging slot is greater than the thickness of the charging base.

3. The tablet computer charging cabinet according to claim 1, characterized in that: The charging cabinet body is provided with an AC input terminal for connecting to an external power supply. The main control board is provided with an input rectifier and filter circuit, a transformer, an output rectifier and filter circuit and a multi-channel BUCK power supply circuit. The AC input terminal is electrically connected to the input end of the input rectifier and filter circuit, the output end of the input rectifier and filter circuit is electrically connected to the primary winding of the transformer, the secondary winding of the transformer is electrically connected to the input end of the output rectifier and filter circuit, and the output end of the output rectifier and filter circuit is electrically connected to the multi-channel wireless transmission circuit through the multi-channel BUCK power supply circuit. The BUCK power supply circuit corresponds to the wireless transmission circuit one by one.

4. The tablet computer charging cabinet according to claim 3, characterized in that: The BUCK power supply circuit includes a first power management chip U4, a capacitor EC6, a capacitor EC9, a capacitor C11, a capacitor C13, a capacitor C30, a capacitor C35, a resistor R21, a resistor R28, a resistor R29, a resistor R30, a resistor R58, and an inductor L3. The BST pin of the first power management chip U4 passes through the resistor R29 and the capacitor C11 in sequence and is electrically connected to the SW pin of the first power management chip U4, one end of the resistor R58, and one end of the inductor L3 respectively. The other end of the resistor R58 passes through the capacitor C30 and is electrically connected to the negative electrode of the capacitor EC9, one end of the resistor R30, and the ground respectively. The other end of the resistor R30 is electrically connected to the first power management chip U4. The CS pin of the chip U4 is electrically connected, the other end of the inductor L3 is electrically connected to the positive electrode of the capacitor EC9, one end of the resistor R28 and the corresponding wireless transmitting circuit, the VIN pin of the first power management chip U4 is electrically connected to the output end of the output rectifier and filter circuit, the positive electrode of the capacitor EC9 and one end of the capacitor C35, the FB pin of the first power management chip U4 is electrically connected to one end of the resistor R21, one end of the capacitor C13 and the other end of the resistor R28, the negative electrode of the capacitor EC9, the other end of the capacitor C35, the other end of the resistor R21, the other end of the capacitor C13 and the GND pin of the first power management chip U4 are all grounded.

5. The tablet computer charging cabinet according to claim 3, characterized in that: One end of the AC input terminal connected to the input rectifier and filter circuit is wrapped with conductive cloth, and the conductive cloth is grounded.

6. The tablet computer charging cabinet according to claim 3, characterized in that: The AC input terminal is electrically connected to the input end of the input rectifier and filter circuit through an RC absorption circuit.

7. The tablet computer charging cabinet according to claim 3, characterized in that: The wireless transmitting circuit includes a wireless transmitting chip and a wireless transmitting coil. The wireless transmitting chip is electrically connected to an input end of the wireless transmitting coil and an output end of a corresponding BUCK power supply circuit.

8. The tablet computer charging cabinet according to claim 7, characterized in that: The wireless transmitting circuit further includes a charging indicator light, the wireless transmitting chip is electrically connected to the charging indicator light, and the charging indicator light is arranged outside a corresponding one of the charging slots.

9. The tablet computer charging cabinet according to claim 1, characterized in that: The wireless receiving circuit includes a wireless receiving coil, a wireless receiving chip, an MCU chip and a second power management chip. The wireless receiving chip is electrically connected to the wireless receiving coil, the MCU chip and the second power management chip respectively. The second power management chip is also electrically connected to the MCU chip and the charging head.

10. The tablet computer charging cabinet according to claim 1, characterized in that: One end of the bottom of each charging slot is concave to form a limiting slot, and a guide hole connected to the limiting slot is transversely opened on the same side of each limiting slot. A limiting portion that can be limited to the limiting slot is provided on the side of the charging base that contacts the charging slot, and a limiting hole is provided on the limiting portion. When the limiting portion is limited in the limiting slot, the limiting hole is aligned with the guide hole; A locking rod is provided in the charging cabinet body, and the locking rod has a first position and a second position. When the locking rod is in the first position, the locking end of the locking rod passes through the guide holes of all the limiting grooves and enters all the limiting grooves; when the locking rod is in the second position, the locking end of the locking rod is disengaged from the guide holes of all the limiting grooves.

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