Anti-crosstalk wireless power supply structure of tablet computer charging cabinet

Abstract

The utility model discloses a kind of anti-crosstalk wireless power supply structures of tablet computer charging cabinet, including input rectification filter circuit, transformer, output rectification filter circuit, multi-channel BUCK power supply circuit and multi-channel wireless transmitting circuit, the input end of input rectification filter circuit is electrically connected with AC input terminal, the output end of input rectification filter circuit is electrically connected with the primary winding of transformer, the secondary winding of transformer is electrically connected with the input end of output rectification filter circuit, the output end of output rectification filter circuit is electrically connected with multi-channel wireless transmitting circuit respectively by multi-channel BUCK power supply circuit, BUCK power supply circuit and wireless transmitting circuit one-to-one correspondence.The utility model reduces the signal interference between each other of wireless transmitting circuit, can be charged cabinet structure design more compact, realize miniaturization.

Description

Technical Field

[0001] This utility model relates to the field of electronic product charging technology, specifically to an anti-crosstalk wireless power supply structure for a tablet computer charging cabinet. Background Technology

[0002] With continuous technological advancements and cost reductions, wireless charging technology is gradually becoming more widespread in various electronic products, including mobile phones, tablets, and laptops, allowing more users to enjoy its convenience. Wireless charging makes electronic products neater and more aesthetically pleasing, avoiding the hassle of messy cables and bringing a cleaner look to modern homes and offices. Wireless chargers are devices that use the principle of electromagnetic induction for charging. By placing a coil at both the transmitting and receiving ends, the transmitting coil emits electromagnetic signals under the influence of electricity, and the receiving coil receives these signals and converts them into current, thus achieving wireless charging.

[0003] During the wireless charging process of a multi-channel wireless charger for tablets, the charging coils generate electromagnetic signals. If the spacing between the charging coils is too small, the electromagnetic signals generated by different charging coils are prone to crosstalk and mutual inductance, which affects the charging effect and may even lead to charging failure. This makes it impossible to achieve miniaturization in actual multi-channel wireless charging designs. Utility Model Content

[0004] To overcome the problem that existing multi-channel wireless chargers for tablets cannot be miniaturized, this utility model provides a crosstalk-proof wireless power supply structure for a tablet charging cabinet.

[0005] The technical solution of this utility model is as follows:

[0006] A crosstalk-prevention wireless power supply structure for a tablet charging cabinet includes an input rectifier and filter circuit, a transformer, an output rectifier and filter circuit, multiple BUCK power supply circuits, and multiple wireless transmission circuits. The input terminal of the input rectifier and filter circuit is electrically connected to an AC input terminal, and the output terminal 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 terminal of the output rectifier and filter circuit. The output terminal of the output rectifier and filter circuit is electrically connected to multiple wireless transmission circuits through the multiple BUCK power supply circuits, with each BUCK power supply circuit corresponding to one of the wireless transmission circuits.

[0007] In a preferred embodiment of this utility model, the BUCK power supply circuit includes a power management chip U4, capacitors EC6, EC9, C11, C13, C30, C35, resistors R21, R28, R29, R30, R58, and inductor L3. The BST pin of the power management chip U4 is connected sequentially through resistor R29 and capacitor C11 to the SW pin of the power management chip U4, one end of resistor R58, and one end of inductor L3. The other end of resistor R58 is connected through capacitor C30 to the negative terminal of capacitor EC9, one end of resistor R30, and ground. The other end of resistor R30 is connected to... The CS pin of the power management chip U4 is electrically connected. The other end of the inductor L3 is electrically connected to the positive terminal of the capacitor EC9, one end of the resistor R28, and the corresponding wireless transmission circuit. The VIN pin of the power management chip U4 is electrically connected to the output terminal of the output rectifier filter circuit, the positive terminal of the capacitor EC9, and one end of the capacitor C35. The FB pin of the 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 terminal 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 power management chip U4 are all grounded.

[0008] As a preferred embodiment of this utility model, the power management chip U4 is model number LYF82031.

[0009] As a preferred embodiment of this utility model, the transformer is a flyback transformer.

[0010] As a preferred embodiment of this utility model, the transformer is model IW3627.

[0011] As a preferred embodiment of this utility model, the transformer has an output voltage of 20V and an output current of 6A; the BUCK power supply circuit has an output voltage of 15V and an output current of 1.33A.

[0012] In a preferred embodiment of this utility model, the input terminal of the input rectifier filter circuit is electrically connected to the AC input terminal through an RC snubber circuit.

[0013] As a preferred embodiment of this utility model, the wireless transmitting circuit includes a wireless transmitting chip and a wireless transmitting coil. The wireless transmitting chip is electrically connected to the input terminal of the wireless transmitting coil and the output terminal of a corresponding BUCK power supply circuit.

[0014] As a preferred embodiment of this utility model, the wireless transmitting circuit further includes a charging indicator light, and the wireless transmitting chip is electrically connected to the charging indicator light.

[0015] As a preferred embodiment of this utility model, the wireless transmitting chip is model MT5811.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This utility model provides a crosstalk-prevention wireless power supply structure for a tablet charging cabinet. By adding a BUCK power supply circuit to each wireless transmitting circuit, each BUCK power supply circuit can independently provide a stable power supply to its corresponding wireless transmitting circuit. This makes the working state of each wireless transmitting circuit relatively independent, reducing the interference signal strength of each wireless transmitting circuit and reducing mutual signal interference. When designing multi-channel wireless charging, it is no longer necessary to reserve too much space to avoid interference, thus allowing the charging cabinet structure to be designed more compactly and miniaturized. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the anti-crosstalk wireless power supply structure of a tablet computer charging cabinet in one embodiment of the present invention;

[0020] Figure 2 This is a circuit diagram of the BUCK power supply circuit in one embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the anti-crosstalk wireless power supply structure of a tablet computer charging cabinet in another embodiment of the present invention;

[0022] Figure 4 This is a schematic block diagram of a wireless transmitting circuit in one embodiment of the present invention;

[0023] Figure 5 This is a circuit diagram of a wireless transmitting chip in one embodiment of the present invention.

[0024] In the diagram,

[0025] 1. Input rectifier and filter circuit; 2. Transformer; 3. Output rectifier and filter circuit; 4. BUCK power supply circuit; 5. Wireless transmission circuit; 51. Wireless transmission coil; 52. Wireless transmission chip; 53. Charging indicator light; 6. AC input terminal; 7. RC absorption circuit. Detailed Implementation

[0026] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. It is also declared that the embodiments described below are only for explaining this utility model and are not intended to limit this utility model.

[0027] It should be noted that the terms "installation," "setting," "connection," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Indications of orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used in the application's product, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. "A plurality" means two or more, unless otherwise explicitly defined.

[0028] Please see Figure 1This utility model provides an anti-crosstalk wireless power supply structure for a tablet computer charging cabinet, including an input rectifier and filter circuit 1, a transformer 2, an output rectifier and filter circuit 3, a multi-channel BUCK power supply circuit 4, and a multi-channel wireless transmission circuit 5. The input terminal of the input rectifier and filter circuit 1 is electrically connected to the AC input terminal 6, the output terminal of the input rectifier and filter circuit 1 is electrically connected to the primary winding of the transformer 2, the secondary winding of the transformer 2 is electrically connected to the input terminal of the output rectifier and filter circuit 3, and the output terminal of the output rectifier and filter circuit 3 is electrically connected to the multi-channel wireless transmission circuit 5 through the multi-channel BUCK power supply circuit 4. The BUCK power supply circuit 4 and the wireless transmission circuit 5 correspond one-to-one. During wireless charging, the charging coils generate electromagnetic signals. If the coil spacing is too small, the electromagnetic signals generated by different charging coils are prone to mutual interference, affecting the charging effect and even causing charging failure. This makes it impossible to achieve miniaturization in practical multi-channel wireless charging designs. Therefore, this invention adds a BUCK power supply circuit 4 to each wireless transmitting circuit 5. Each BUCK power supply circuit 4 can independently provide a stable power supply to its corresponding wireless transmitting circuit 5, making the operating state of each wireless transmitting circuit 5 relatively independent. This reduces the interference signal strength of each wireless transmitting circuit and minimizes mutual signal interference, enabling multiple wireless transmitting circuits 5 to work stably and normally. This effectively solves the crosstalk and mutual inductance problems between multiple wireless transmitting circuits 5. Through comparative testing, the interference signal strength of the BUCK power supply circuit 4 without independent power supply is approximately 200mV, while the interference signal strength of the BUCK power supply circuit 4 with independent power supply is reduced to approximately 40mV. This invention eliminates the need to reserve excessive space to avoid interference when designing multi-channel wireless charging, allowing for a more compact charging cabinet structure and miniaturization.

[0029] Please see Figure 2In one embodiment, the BUCK power supply circuit 4 includes a power management chip U4, capacitors EC6, EC9, C11, C13, C30, and C35, resistors R21, R28, R29, R30, and R58, and an inductor L3. The BST pin of the power management chip U4 is connected to the SW pin of the power management chip U4, one end of resistor R58, and one end of inductor L3 via resistor R29 and capacitor C11. The other end of resistor R58 is connected to the negative terminal of capacitor EC9, one end of resistor R30, and ground via capacitor C30. The other end of resistor R30... The inductor L3 is electrically connected to the CS pin of the power management chip U4. The other end of the inductor L3 is electrically connected to the positive terminal of capacitor EC9, one end of resistor R28, and the corresponding wireless transmission circuit 5. The VIN pin of the power management chip U4 is electrically connected to the output terminal of the output rectifier filter circuit 3, the positive terminal of capacitor EC9, and one end of capacitor C35. The FB pin of the power management chip U4 is electrically connected to one end of resistor R21, one end of capacitor C13, and the other end of resistor R28. The negative terminal of capacitor EC9, the other end of capacitor C35, the other end of resistor R21, the other end of capacitor C13, and the GND pin of the power management chip U4 are all grounded. The BUCK power supply circuit 4 outputs 15V and 1.33A; the transformer 2 outputs 20V and 6A.

[0030] In the aforementioned BUCK power supply circuit 4, the power management chip U4 and surrounding components such as capacitors, resistors, and inductors convert the 20V output from transformer 2 into a 15V voltage suitable for the wireless transmitter circuit 5. This allows the wireless transmitter circuit 5 to operate under a suitable voltage environment, ensuring its stable and reliable performance. The voltage divider circuit composed of resistors R21 and R28 connected to the FB pin of the power management chip U4 monitors the output voltage in real time and adjusts the chip's operating state based on feedback signals, thereby maintaining a stable output voltage. Even with load changes or input voltage fluctuations, it ensures the output voltage remains at 15V, providing a stable power supply for the wireless transmitter circuit 5. Capacitors EC6, EC9, C11, C13, C30, and C35 act as filters and energy storage components in the circuit, smoothing voltage fluctuations, reducing ripple and noise in the power supply, and providing a cleaner power source. Resistor R30 serves as a current sensing resistor and is connected to the CS pin of the power management chip U4. When the current in the circuit is too high, 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.

[0031] In one specific embodiment, the power management chip U4 is model LYF82031. The LYF82031 chip has high conversion efficiency, which can efficiently convert the input electrical energy into voltage and current suitable for use by the wireless transmission circuit 5. It can precisely control the output voltage and current and integrates a variety of protection functions, such as overcurrent protection, overvoltage protection, undervoltage protection and overheat protection.

[0032] In one specific embodiment, transformer 2 is a flyback transformer, model IW3627. The flyback transformer IW3627 can adapt to a wide input voltage range, has good electrical isolation, high energy conversion efficiency, and stable output characteristics.

[0033] In one embodiment, the input voltage range of AC input terminal 6 is 90V-264V, enabling the charging cabinet to adapt to different regional power grid voltages, thus improving the product's versatility and applicability. It can operate normally in both low- and high-voltage areas, providing convenience for users.

[0034] Please see Figure 3 In one embodiment, the AC input terminal 6 is electrically connected to the input terminal of the input rectifier filter circuit 1 via an RC snubber circuit 7. The RC snubber circuit 7 consists of a resistor (R) and a capacitor (C). The RC snubber circuit 7 has a certain filtering effect on the electromagnetic interference signal generated by the wireless transmitting circuit 5. The capacitor has a small impedance to the electromagnetic interference signal, which can bypass the electromagnetic interference signal to ground, while the resistor can limit the current and prevent excessive current from damaging the circuit. In this way, the RC snubber circuit 7 can further reduce the electromagnetic interference signal in the power input, improve the purity of the power supply, and reduce the impact of EMI interference on the entire tablet computer charging cabinet. Secondly, when the AC input terminal 6 is connected to the power supply, a momentary surge voltage may occur, which may damage or interfere with the input rectifier filter circuit 1. When a surge voltage occurs, the RC snubber circuit 7 can absorb the surge energy through the charging of the capacitor and the current limiting effect of the resistor, reduce the amplitude of the surge voltage, and protect the input rectifier filter circuit 1 from damage.

[0035] Please see Figure 4In one embodiment, the wireless transmitting circuit 5 includes a wireless transmitting coil 51 and a wireless transmitting chip 52. The wireless transmitting chip 52 is electrically connected to the input terminal of the wireless transmitting coil 51 and the output terminal of a corresponding BUCK power supply circuit 4. The wireless transmitting chip 52, in conjunction with the wireless transmitting coil 51, can convert the electrical energy provided by the BUCK power supply circuit 4 into electromagnetic signals and transmit them, thus realizing the wireless charging function. By connecting to the corresponding BUCK power supply circuit 4, a stable power supply is ensured for the wireless transmitting circuit 5, enabling the wireless transmitting coil 51 to continuously and stably transmit electromagnetic signals.

[0036] Furthermore, the wireless transmitting circuit 5 also includes a charging indicator light 53. The wireless transmitting chip 52 is electrically connected to the charging indicator light 53, and the charging indicator light 53 is located on the outside of a corresponding charging slot. The charging indicator light 53 can reflect the working status of the wireless transmitting circuit 5 in real time. When the wireless transmitting circuit 5 is working normally and transmitting electromagnetic signals to the charging base, the charging indicator light 53 lights up, allowing the user to intuitively see that the corresponding charging slot is charging the tablet computer inside the charging base. This provides the user with a clear indication of the charging status, making it easy for the user to understand whether the tablet computer is charging normally and whether charging is complete.

[0037] Please see Figure 5 In one specific embodiment, the wireless transmitter chip 52 is model MT5811. The MT5811 chip has good compatibility with other circuit components (such as the wireless transmitter coil 51, the BUCK power supply circuit 4, etc.), can operate stably in the working environment of the charging cabinet, reduce the occurrence of failures caused by chip performance problems, and improve the reliability of the entire wireless charging system.

[0038] It should be noted that since the input rectifier filter circuit 1, the output rectifier filter circuit 3 and the RC absorption circuit 7 are existing technologies well known to those skilled in the art, this utility model has not made any improvements to them, so their specific circuit structures and working principles will not be described in detail.

[0039] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

[0040] The present utility model patent has been described above with reference to the accompanying drawings. Obviously, the implementation of the present utility model patent is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present utility model patent, or the direct application of the inventive concept and technical solution of the present utility model patent to other occasions without modification, are all within the protection scope of the present utility model.

Claims

1. A crosstalk-prevention wireless power supply structure for a tablet charging cabinet, characterized in that, The system includes an input rectifier and filter circuit, a transformer, an output rectifier and filter circuit, a multi-channel BUCK power supply circuit, and a multi-channel wireless transmission circuit. The input terminal of the input rectifier and filter circuit is electrically connected to the AC input terminal, and the output terminal 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 terminal of the output rectifier and filter circuit, and the output terminal of the output rectifier and filter circuit is electrically connected to the multiple wireless transmission circuits through the multiple BUCK power supply circuits. Each BUCK power supply circuit corresponds to one wireless transmission circuit.

2. The anti-crosstalk wireless power supply structure for the tablet charging cabinet according to claim 1, characterized in that, The BUCK power supply circuit includes a power management chip U4, capacitors EC6, EC9, C11, C13, C30, and C35, resistors R21, R28, R29, R30, and R58, and an inductor L3. The BST pin of the power management chip U4 is connected sequentially through resistor R29 and capacitor C11 to the SW pin of the power management chip U4, one end of resistor R58, and one end of inductor L3. The other end of resistor R58 is connected through capacitor C30 to the negative terminal of capacitor EC9, one end of resistor R30, and ground. The other end of resistor R30 is connected to the power management chip... The CS pin of U4 is electrically connected. The other end of the inductor L3 is electrically connected to the positive terminal of the capacitor EC9, one end of the resistor R28, and the corresponding wireless transmission circuit. The VIN pin of the power management chip U4 is electrically connected to the output terminal of the output rectifier filter circuit, the positive terminal of the capacitor EC9, and one end of the capacitor C35. The FB pin of the 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 terminal 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 power management chip U4 are all grounded.

3. The anti-crosstalk wireless power supply structure for the tablet charging cabinet according to claim 2, characterized in that, The power management chip U4 is model number LYF82031.

4. The anti-crosstalk wireless power supply structure for the tablet charging cabinet according to claim 1, characterized in that, The transformer is a flyback transformer.

5. The anti-crosstalk wireless power supply structure for the tablet charging cabinet according to claim 4, characterized in that, The transformer is model IW3627.

6. The anti-crosstalk wireless power supply structure for the tablet charging cabinet according to claim 1, characterized in that, The transformer has an output voltage of 20V and an output current of 6A; the BUCK power supply circuit has an output voltage of 15V and an output current of 1.33A.

7. The anti-crosstalk wireless power supply structure for the tablet charging cabinet according to claim 1, characterized in that, The input terminal of the input rectifier filter circuit is electrically connected to the AC input terminal through an RC snubber circuit.

8. The anti-crosstalk wireless power supply structure for the tablet charging cabinet according to claim 1, 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 the input terminal of the wireless transmitting coil and the output terminal of a corresponding BUCK power supply circuit.

9. The anti-crosstalk wireless power supply structure for the tablet charging cabinet according to claim 8, characterized in that, The wireless transmitting circuit also includes a charging indicator light, and the wireless transmitting chip is electrically connected to the charging indicator light.

10. The anti-crosstalk wireless power supply structure for the tablet charging cabinet according to claim 8, characterized in that, The wireless transmitter chip is model MT5811.

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