A circuit for identifying a user identity and a docking station

Abstract

The utility model relates to electronic circuit technical field, relate to a kind of circuit and docking station of identification user identity.The circuit of identification user identity includes uplink interface module, a plurality of downlink interface module, HUB control module, power module, identity identification module and main control module, HUB control module is connected with uplink interface module, each downlink interface module, HUB control module is used to distribute the external terminal signal received by uplink interface module to each downlink interface module;Power module is connected with uplink interface module, each downlink interface module, to obtain power supply from external terminal by uplink interface module, and power supply is provided for each downlink interface module;Identity identification module is used to establish communication connection with external authorized carrier, and read the identity information pre-stored in external authorized carrier;Main control module is used to receive and verify the identity information transmitted by identity identification module, and according to the verification result of identity information, the start-stop state of power module is controlled.The application can improve safety performance.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to a circuit and expansion dock for identifying user identity. Background Technology

[0002] As mobile terminals such as laptops and tablets reduce their interfaces, docking stations and other expansion devices have become core devices for improving the convenience of terminals because they can expand a single interface into multiple interfaces and realize peripheral expansion. Existing expansion devices are designed with interface expansion and transmission efficiency in mind. Users simply connect their terminal to the expansion device's circuitry to directly access the expanded interface and connect peripherals via the docking station without authentication. Therefore, the circuitry of existing expansion devices struggles to guarantee the security of connected devices, resulting in poor security performance. Utility Model Content

[0003] This utility model provides a circuit and expansion dock for identifying user identity, in order to solve the problem that the circuit of the expansion device cannot guarantee the safety of the connected device and has poor security protection performance.

[0004] This utility model discloses a circuit for identifying user identity, comprising: Uplink interface module; Multiple downlink interface modules; The HUB control module is connected to the uplink interface module and each of the downlink interface modules. The HUB control module is used to distribute the external terminal signals received by the uplink interface module to each of the downlink interface modules. A power supply module is connected to the uplink interface module and each of the downlink interface modules to obtain power from an external terminal through the uplink interface module and to supply power to each of the downlink interface modules. An identity recognition module is used to establish a communication connection with an external authorization carrier and read the identity information pre-stored in the external authorization carrier; The main control module is connected to the identity recognition module, the HUB control module and the power supply module. The main control module is used to receive and verify the identity information transmitted by the identity recognition module, and control the start and stop status of the power supply module according to the verification result of the identity information.

[0005] Optionally, the identity recognition module is an NFC communication module, which includes a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first resistor, a second resistor, a third resistor, and a fourth resistor. The first inductor, the third capacitor, and the first resistor are connected in series, with the first end of the series connection connected to the main control module and the second end connected to ground. The second inductor, the fourth capacitor, and the second resistor are connected in series, with the first end of the series connection connected to the main control module and the second end connected to ground. The first capacitor and the second capacitor are connected in series, and the series connection node is connected to ground. The first end is connected to the series connection node of the first inductor and the third capacitor, and the second end is connected to the series connection node of the second inductor and the fourth capacitor. The fifth capacitor and the sixth capacitor are connected in series, and the series connection node is connected to ground. The first end is connected to the series connection node of the third capacitor and the first resistor, and the second end is connected to the series connection node of the fourth capacitor and the second resistor. The third resistor is connected in series with the fourth resistor, and the first end of the series connection is connected to the series node of the first resistor and the third capacitor, and the second end is connected to the main control module. The seventh capacitor is connected in series with the eighth capacitor, and the first end of the series connection is connected to the series node of the third resistor and the fourth resistor, and the second end is connected to ground.

[0006] Optionally, the plurality of downlink interface modules include a first downlink interface module and at least one second downlink interface module. The power supply module includes a step-down unit and a current limiting unit. The voltage input terminal of the step-down unit is connected to the uplink interface module, and the voltage output terminal is connected to the power supply terminal of the first downlink interface module. The current input terminal of the current limiting unit is connected to the uplink interface module, and the current output terminal is connected to the power supply terminal of each of the second downlink interface modules.

[0007] Optionally, the buck unit includes a buck chip, a third inductor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth capacitor. The fifth resistor is connected in series between the input terminal and the drive terminal of the buck chip. The sixth resistor is connected in series between the drive terminal of the buck chip and the main control module. The seventh resistor and the eighth resistor are connected in series, and the series node is connected to the feedback terminal of the buck chip. The first end is connected to one end of the third inductor, the power supply terminal of the first downlink interface module, and one end of the ninth capacitor. The second end is connected to ground. The other end of the third inductor is connected to the inductor connection terminal of the buck chip. The other end of the ninth capacitor is connected to the feedback terminal of the buck chip. The input terminal of the buck chip is connected to the uplink interface module.

[0008] Optionally, the current limiting unit includes a current limiting chip, a first switching transistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a tenth capacitor. The input terminal of the current limiting chip is connected to the uplink interface module, the output terminal is connected to each of the second downlink interface modules, and the driving terminal is connected to the drain of the first switching transistor. The gate of the first switching transistor is connected to the main control module through the ninth resistor. The tenth resistor is connected in series between the drain of the first switching transistor and the main control module. The eleventh resistor and the twelfth resistor are connected in series, with the first end of the series connection connected to the input terminal of the current limiting unit, the second end connected to ground, and the series connection node connected to the driving terminal of the current limiting chip. The tenth capacitor is connected in parallel with the eleventh resistor, and the thirteenth resistor is connected in series between the current setting terminal of the current limiting chip and ground.

[0009] Optionally, the first downlink interface module includes a network control chip, a network filter chip, and a network interface. The power supply terminal of the network control chip is connected to the voltage output terminal of the step-down unit, and its data transmission terminal is connected to the HUB control module. The network filter chip is located between the network control chip and the network interface.

[0010] Optionally, the circuit for identifying the user's identity further includes a charging interface module, which is connected to the uplink interface module.

[0011] Optionally, the circuit for identifying the user's identity further includes an anti-backflow module disposed between the charging interface module and the uplink interface module, used to limit the current from the charging interface module to flow back to the uplink interface module.

[0012] Optionally, the anti-backflow module includes a diode, a second switch, a third switch, a fourth switch, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, and a seventeenth resistor. The anode of the diode is connected to the uplink interface module and the source of the second switch, and the cathode is connected to the power supply module and the source of the third switch. The gate of the second switch is connected to the gate of the third switch. The fourteenth and fifteenth resistors are connected in series, with the first end of the series connection connected to the charging interface module and the drain of the fourth switch, and the second end connected to ground. The series connection node is connected to the gate of the second switch and the gate of the third switch. The sixteenth and seventeenth resistors are connected in series, with the first end connected to the drain of the second switch and the drain of the third switch, and the second end connected to ground. The series connection node is connected to the gate of the fourth switch, and the source of the fourth switch is connected to the cathode of the diode.

[0013] This utility model also discloses an expansion dock, including a circuit for identifying user identity as described in any of the above claims.

[0014] The beneficial effects of the circuit and expansion dock for identifying user identity provided in this embodiment of the utility model are as follows: By setting up an uplink interface module, multiple downlink interface modules, a HUB control module, a power supply module, an identity recognition module, and a main control module, the HUB control module can distribute the external terminal signals received by the uplink interface module to each downlink interface module, realizing the peripheral expansion of the connected terminal; the identity recognition module can establish a communication connection with the external authorized carrier and read the identity information pre-stored in the external authorized carrier; the main control module receives and verifies the identity information transmitted by the identity recognition module, and controls the start and stop status of the power supply module according to the verification result of the identity information, so that the power supply module only supplies power to each downlink interface module after recognizing the authorized identity information, and each downlink interface module can be used normally, thereby improving the security protection performance of the circuit and expansion dock for identifying user identity. Attached Figure Description

[0015] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a structural block diagram of the circuit for identifying user identity according to an embodiment of this utility model; Figure 2 This is a circuit diagram of the main control module in an embodiment of this utility model; Figure 3 This is a circuit diagram of the identity recognition module according to an embodiment of the present utility model; Figure 4 This is a circuit diagram of the step-down unit according to an embodiment of the present invention; Figure 5 This is a circuit diagram of the current limiting unit according to an embodiment of the present invention; Figure 6 This is a circuit diagram of the HUB control module according to an embodiment of the present invention; Figure 7 This is a circuit diagram showing the connection between the charging interface module and the anti-backflow module in an embodiment of this utility model; Figure 8 This is a circuit diagram of the network control chip according to an embodiment of the present invention; Figure 9 This is a circuit diagram of the network interface connecting to the network filter chip according to an embodiment of this utility model; Figure 10 This is a circuit diagram of the uplink interface module according to an embodiment of the present invention.

[0016] The labels for the attached figures are as follows: 10. Uplink interface module; 20. HUB control module; 30. Power supply module; 31. Step-down unit; 32. Current limiting unit; 40. Identification module; 50. Main control module; 60. First downlink interface module; 70. Second downlink interface module; 80. Charging interface module; 90. Backflow prevention module; L1, First inductor; L2, Second inductor; L3, Third inductor; C1, First capacitor; C2, Second capacitor; C3, Third capacitor; C4, Fourth capacitor; C5, Fifth capacitor; C6, Sixth capacitor; C7, Seventh capacitor; C8, Eighth capacitor; C9, Ninth capacitor; C10, Tenth capacitor; R1, First resistor; R2, Second resistor; R3, Third resistor; R4, Fourth resistor; R5, Fifth resistor; R6, Sixth resistor; R7, Seventh resistor; R8, Eighth resistor; R9 R10, R11, R12, R13, R14, R15, R16, R17, R18; Q1, Q2, Q3, Q4, R19; U1, U2, U3, U4; U3, U5, U6, U7, U8; Q1, Q9, U10, U11, U12, U13, U14, U15, U16, U17, U18; Q1, Q1, Q2, Q3, Q4, U1 ... Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0018] This utility model embodiment provides a circuit for identifying user identity, such as... Figure 1 As shown, the circuit for identifying user identity includes an uplink interface module 10, multiple downlink interface modules, a HUB control module 20, a power supply module 30, an identity recognition module 40, and a main control module 50.

[0019] The uplink interface module 10 can connect to the terminal, receive terminal signals, and also obtain power from the terminal.

[0020] HUB control module 20 is connected to uplink interface module 10 and each downlink interface module. HUB control module 20 is used to distribute external terminal signals received by uplink interface module 10 to each downlink interface module.

[0021] The power supply module 30 is connected to the uplink interface module 10 and each downlink interface module to obtain power from the external terminal through the uplink interface module 10 and to supply power to each downlink interface module.

[0022] The identity recognition module 40 is used to establish a communication connection with the external authorized carrier and read the identity information pre-stored in the external authorized carrier.

[0023] The main control module 50 is connected to the identity recognition module 40, the HUB control module 20 and the power supply module 30. The main control module 50 is used to receive and verify the identity information transmitted by the identity recognition module 40, and control the start and stop status of the power supply module 30 according to the verification result of the identity information.

[0024] The circuit for identifying user identity in this embodiment of the application is configured with an uplink interface module 10, multiple downlink interface modules, a HUB control module 20, a power supply module 30, an identity recognition module 40, and a main control module 50. The HUB control module 20 can distribute the external terminal signals received by the uplink interface module 10 to each downlink interface module, thereby enabling peripheral expansion of the connected terminals. The identity recognition module 40 can establish a communication connection with an external authorized carrier and read the identity information pre-stored in the external authorized carrier. The main control module 50 receives and verifies the identity information transmitted by the identity recognition module 40, and controls the start / stop state of the power supply module 30 according to the verification result of the identity information. This ensures that the power supply module 30 only supplies power to each downlink interface module after recognizing the authorized identity information, so that each downlink interface module can be used normally, thereby improving the security protection performance of the circuit for identifying user identity.

[0025] Specifically, after the uplink interface module 10 connects to a terminal (such as a computer), the main control module 50 and the HUB control module 20 begin normal operation. At this time, the interfaces and network ports of each downlink interface module are not powered and cannot function properly. When the external authorization carrier establishes a communication connection with the identity recognition module 40, the identity recognition module 40 reads the identity information pre-stored on the external authorization carrier. The main control module 50 verifies the identity information. If the identity information is authorized, the main control module 50 controls the power supply module 30 to turn on, providing power to each downlink interface module. If the identity information is unauthorized, the main control module 50 turns off the power supply module 30, stopping power supply to each downlink interface module, preventing the terminal from accessing the devices connected to each downlink interface module and ensuring the security of device data. The main control module 50 pre-stores authorized identity information. If the received identity information matches the pre-stored identity information, it is considered authorized; if the received identity information does not match the pre-stored identity information, it is considered unauthorized. The main control module 50 can be implemented using existing chips, such as the CH585M chip. The circuit diagram of the main control module 50 is as follows: Figure 2 As shown.

[0026] Therefore, only authorized users can use products with circuitry that identifies users, which can improve data and device security in public environments.

[0027] The HUB control module 20 can be implemented using a hub control chip and its peripheral circuitry. The circuit diagram of the HUB control module 20 is shown below. Figure 6 As shown.

[0028] like Figures 1 to 5 As shown in this embodiment, the identity recognition module 40 is an NFC communication module. The NFC communication module includes a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The first inductor L1, the third capacitor C3, and the first resistor R1 are connected in series, with the first end of the series connection connected to the main control module 50 and the second end connected to ground. The second inductor L2, the fourth capacitor C4, and the second resistor R2 are connected in series, with the first end of the series connection connected to the main control module 50 and the second end connected to ground. The first capacitor C1 and the second capacitor C2 are connected in series. The series connection nodes of capacitors C1 and C3 are connected to ground. The first end of the series connection nodes is connected to the first inductor L1 and the third capacitor C3, and the second end is connected to the second inductor L2 and the fourth capacitor C4. The fifth capacitor C5 and the sixth capacitor C6 are connected in series, and the series connection nodes are connected to ground. The first end of the series connection nodes is connected to the third capacitor C3 and the first resistor R1, and the second end is connected to the fourth capacitor C4 and the second resistor R2. The third resistor R3 and the fourth resistor R4 are connected in series, and the first end of the series connection nodes is connected to the first resistor R1 and the third capacitor C3, and the second end is connected to the main control module 50. The seventh capacitor C7 and the eighth capacitor C8 are connected in series, and the first end of the series connection nodes is connected to the third resistor R3 and the fourth resistor R4, and the second end is connected to ground.

[0029] Specifically, NFC (Near-Field Communication) is a short-range, high-frequency wireless communication technology that allows two electronic devices to exchange data contactlessly at very close range. The first inductor L1, the second inductor L2, the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 form an LC resonant network. Through parameter matching, this network enhances the electromagnetic coupling efficiency between the identity recognition module 40 and the external authorized carrier, ensuring stable communication. The fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, and the eighth capacitor C8, through grounding design, can filter out noise and interference, ensuring the accuracy of the NFC communication module's reading of identity information. The placement of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 optimizes signal transmission quality and protects the circuit.

[0030] The external authorized carrier communicating with the NFC communication module of this application can be an NFC card or an electronic device with NFC functionality. When the NFC card or electronic device is brought close to the NFC communication module of the user identification circuit, a communication connection is established with the NFC communication module, and the NFC communication module can read the pre-stored identity information in the external authorized carrier. When the external authorized carrier stores identity information, the user can set the pre-stored identity information according to their needs or preferences. Administrators can also easily track the usage of users through this user identification circuit, which is beneficial to the management of the products to which the user identification circuit is applied.

[0031] In other embodiments, the identity recognition module 40 can also be a fingerprint recognition module or other recognition module capable of acquiring the identity information of an external authorized carrier. This application uses an NFC communication module, which has a short communication distance and fast communication establishment speed. Users can complete the recognition simply by bringing the authorized carrier (such as an NFC card or mobile phone) close to the NFC communication module, without needing to enter a password or other cumbersome verification operations. The interaction process is simple and efficient, the operation is very convenient, and the user experience is improved.

[0032] like Figure 1 , Figure 4 , Figure 5 and Figure 10 As shown in the embodiment of this application, the multiple downlink interface modules include a first downlink interface module 60 and at least one second downlink interface module 70. The power supply module 30 includes a step-down unit 31 and a current limiting unit 32. The voltage input terminal of the step-down unit 31 is connected to the uplink interface module 10, and the voltage output terminal is connected to the power supply terminal of the first downlink interface module 60. The current input terminal of the current limiting unit 32 is connected to the uplink interface module 10, and the current output terminal is connected to the power supply terminal of each second downlink interface module 70.

[0033] Specifically, the first downlink interface module 60 and at least one second downlink interface module 70 can be connected to different devices, and their required power supply voltage and current may differ. The step-down unit 31 can stably convert the voltage input from the uplink interface module 10 into the specific voltage required by the first downlink interface module 60, meeting its power supply needs and preventing damage from excessive voltage. The current limiting unit 32 provides overcurrent protection for the second downlink interface module 70 by limiting its output current, and also supplies power to the second downlink interface module 70. Therefore, by setting the step-down unit 31 and the current limiting unit 32, the power supply needs of the first downlink interface module 60 and each of the second downlink interface modules 70 can be met respectively, improving energy efficiency.

[0034] Optionally, the second downlink interface module 70 can use a USB interface and its peripheral circuitry, allowing the terminal to connect to peripherals such as a mouse and keyboard via circuitry that identifies the user. The second downlink interface module 70 can also use a Type-C interface, an audio interface, and its peripheral circuitry.

[0035] like Figure 1 , Figure 4 , Figures 8 to 10 As shown in this embodiment, the step-down unit 31 includes a step-down chip U1, a third inductor L3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth capacitor C9. The fifth resistor R5 is connected in series between the input terminal and the driving terminal of the step-down chip U1. The sixth resistor R6 is connected in series between the driving terminal of the step-down chip U1 and the main control module 50. The seventh resistor R7 and the eighth resistor R8 are connected in series, and the series node is connected to the feedback terminal of the step-down chip U1. The first end is connected to one end of the third inductor L3, the power supply terminal of the first downlink interface module 60, and one end of the ninth capacitor C9. The second end is connected to the ground terminal. The other end of the third inductor L3 is connected to the inductor connection terminal of the step-down chip U1. The other end of the ninth capacitor C9 is connected to the feedback terminal of the step-down chip U1. The input terminal of the step-down chip U1 is connected to the uplink interface module 10.

[0036] Specifically, the switching transistor inside the buck converter U1 and the third inductor L3 form a buck topology circuit. Through high-frequency switching (on / off), the voltage input from the uplink interface module 10 is stepped down and converted into a stable output voltage to power the first downlink interface module 60. The seventh resistor R7 and the eighth resistor R8 form a "voltage divider feedback network," with their series connection node linked to the feedback terminal of the buck converter U1. The feedback terminal detects the voltage at this node, and the buck converter U1 compares this voltage with its internal reference voltage. By adjusting the on / off time of the internal switching transistor, the output voltage is dynamically adjusted to ensure that the power supply voltage of the first downlink interface module 60 remains stable at a preset value. This feedback mechanism can offset the impact of input voltage fluctuations or load current changes on the output voltage, ensuring power supply accuracy. The fifth resistor R5 and the sixth resistor R6 provide current limiting protection. The ninth capacitor C9 serves as a filter for noise reduction.

[0037] Optionally, the step-down chip U1 can be implemented using a chip with the model number SY8089A.

[0038] like Figure 1 , Figure 5As shown in this embodiment, the current limiting unit 32 includes a current limiting chip U2, a first switching transistor Q1, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a tenth capacitor C10. The input terminal of the current limiting chip U2 is connected to the uplink interface module 10, the output terminal is connected to each of the second downlink interface modules 70, and the driving terminal is connected to the drain of the first switching transistor Q1. The gate of the first switching transistor Q1 is connected to the main control module 50 through the ninth resistor R9. The tenth resistor R10 is connected in series between the drain of the first switching transistor Q1 and the main control module 50. The eleventh resistor R11 and the twelfth resistor R12 are connected in series, and the first end of the series connection is connected to the input terminal of the current limiting unit 32, the second end is connected to the ground terminal, and the series connection node is connected to the driving terminal of the current limiting chip U2. The tenth capacitor C10 is connected in parallel with the eleventh resistor R11, and the thirteenth resistor R13 is connected in series between the current setting terminal and the ground terminal of the current limiting chip U2.

[0039] Specifically, the current limiting chip U2 monitors the output current of the uplink interface module 10 and limits the maximum current flowing to each of the second downlink interface modules 70, preventing excessive current from damaging the second downlink interface modules 70 and the connected devices. The first switch Q1, in conjunction with the main control module 50, controls the drive state of the current limiting chip U2, thus controlling the on / off state of the power supply to the second downlink interface modules 70. When the main control module 50 outputs a high level, the first switch Q1 is turned on, its drain level is pulled low, acting on the drive terminal of the current limiting chip U2, causing the current limiting chip U2 to start outputting power to the second downlink interface modules 70. When the main control module 50 outputs a low level, the first switch Q1 is turned off, the drive terminal state of the current limiting chip U2 changes, the current limiting chip U2 stops outputting, and the power supply to the second downlink interface modules 70 is cut off, thereby implementing the "power supply is only allowed after authentication" access control logic. The ninth resistor R9 acts as a current limiting protection, preventing excessive current from damaging the first switch Q1. Eleventh resistor R11 and twelfth resistor R12 provide reference signals for the current limiting chip U2, assisting in setting the current limiting threshold. Tenth resistor R10 is connected in series between the drain of the first switching transistor Q1 and the main control module 50, serving as a status feedback resistor to feed back the operating status of the current limiting unit 32 to the main control module 50. Thirteenth resistor R13 can be set to a suitable resistance value to determine the maximum current. Tenth capacitor C10 acts as a filter.

[0040] Optionally, the current limiting chip U2 can be implemented using a chip such as SY6282ACC.

[0041] like Figure 1 , Figure 8 and Figure 9As shown in the embodiment of this application, the first downlink interface module 60 includes a network control chip U3, a network filter chip U4, and a network interface J1. The power supply terminal of the network control chip U3 is connected to the voltage output terminal of the step-down unit 31, and its data transmission terminal is connected to the HUB control module 20. The network filter chip U4 is located between the network control chip U3 and the network interface J1.

[0042] Specifically, the network control chip U3 primarily converts the external terminal signals transmitted by the HUB control module 20 using its built-in network protocol stack (such as TCP / IP and Ethernet protocols) to achieve data format conversion (e.g., converting general data transmitted by the HUB control module 20 into network data packets), ensuring protocol compatibility with the external network devices connected to the network interface J1. The network filter chip U4 filters out interference signals in the line, improving communication reliability. The network interface J1, as a physical connection component, provides standardized mechanical and electrical interfaces, facilitating quick plugging and unplugging of external network devices (such as network cables and fiber optics), meeting users' "plug-and-play" requirements. Therefore, by configuring the network control chip U3, the network filter chip U4, and the network interface, the terminal can connect to external network devices through a circuit that identifies the user, stably and securely realizing network data expansion functions.

[0043] Optionally, the network control chip U3 can be implemented using a chip such as AX88772D. The network filter chip U4 can be implemented using a chip such as HD16K01S. The network interface can be an RJ45 interface, RJ11 interface, etc.

[0044] like Figure 1 As shown in the embodiment of this application, the circuit for identifying the user's identity also includes a charging interface module 80, which is connected to the uplink interface module 10.

[0045] By setting up the charging interface module 80, power can be obtained from an external terminal through the uplink interface module 10 to charge external devices such as mobile phones, realizing the parallel operation of "data expansion" and "device charging", meeting different scenario needs and improving the applicability of the circuit for identifying user identity.

[0046] Optionally, the charging interface module 80 can use a Type-C interface and its peripheral circuitry. The Type-C interface can draw power from the uplink interface module 10 to charge the connected device (such as a mobile phone).

[0047] like Figure 1 , Figure 7 and Figure 10As shown in the embodiment of this application, the circuit for identifying user identity also includes an anti-backflow module 90 disposed between the charging interface module 80 and the uplink interface module 10, for limiting the current from the charging interface module 80 backflowing to the uplink interface module 10.

[0048] When both the uplink interface module 10 and the charging interface module 80 are connected to devices, the current from the device connected to the charging interface module 80 may flow back into the terminal connected to the uplink interface module 10, damaging the terminal's internal circuitry. Therefore, by setting an anti-backflow module 90 between the charging interface module 80 and the uplink interface module 10, the current flow can be limited, blocking the backflow path at the hardware level and preventing damage to the terminal's internal circuitry.

[0049] like Figure 1 , Figure 7 and Figure 10 As shown in this embodiment, the anti-backflow module 90 includes a diode D1, a second switch Q2, a third switch Q3, a fourth switch Q4, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R17. The anode of diode D1 is connected to the source of the uplink interface module 10 and the second switch Q2, and the cathode is connected to the source of the power supply module 30 and the third switch Q3. The gate of the second switch Q2 is connected to the gate of the third switch Q3. The fourteenth resistor R14 is connected to the source of the first switch Q2. The fifteenth resistor R15 is connected in series, with the first end of the series connection to the charging interface module 80 and the drain of the fourth switch Q4, and the second end connected to ground. The series connection node is connected to the gate of the second switch Q2 and the gate of the third switch Q3. The sixteenth resistor R16 and the seventeenth resistor R17 are connected in series, with the first end of the series connection to the drain of the second switch Q2 and the drain of the third switch Q3, and the second end connected to ground. The series connection node is connected to the gate of the fourth switch Q4, and the source of the fourth switch Q4 is connected to the cathode of the diode D1.

[0050] Specifically, when both the uplink interface module 10 and the charging interface module 80 are connected to devices, the output voltage of the uplink interface module 10 is applied to the positive terminal of diode D1, making diode D1 forward-biased. The second switch Q2 and the third switch Q3 are cut off, while the fourth switch Q4 is turned on. The uplink interface module 10 supplies power to the first downlink interface module 60 and the charging interface. The current from the charging interface does not flow to the uplink interface module 10 due to the unidirectional flow restriction of diode D1. When the charging interface module 80 is not connected to a device, the second switch Q2 and the third switch Q3 are turned on, while the fourth switch Q4 is cut off. Current flows from the uplink interface module 10 to the power supply module 30, providing normal power.

[0051] The circuit for identifying user identity in this application embodiment can be applied to docking stations or other products with extended peripheral functions to improve the security of the applied products.

[0052] This embodiment of the invention also provides a docking station, which includes the user identification circuit described above. This docking station has the same structure and beneficial effects as the user identification circuit in the foregoing embodiments. The structure and beneficial effects of the user identification circuit have been described in detail in the foregoing embodiments and will not be repeated here.

[0053] It should be understood that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of this utility model.

Claims

1. A circuit for identifying a user, characterized in that, include: Uplink interface module; Multiple downlink interface modules; The HUB control module is connected to the uplink interface module and each of the downlink interface modules. The HUB control module is used to distribute the external terminal signals received by the uplink interface module to each of the downlink interface modules. A power supply module is connected to the uplink interface module and each of the downlink interface modules to obtain power from an external terminal through the uplink interface module and to supply power to each of the downlink interface modules. An identity recognition module is used to establish a communication connection with an external authorization carrier and read the identity information pre-stored in the external authorization carrier; The main control module is connected to the identity recognition module, the HUB control module and the power supply module. The main control module is used to receive and verify the identity information transmitted by the identity recognition module, and control the start and stop status of the power supply module according to the verification result of the identity information.

2. The circuit for identifying user identity according to claim 1, characterized in that, The identity recognition module is an NFC communication module, which includes a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first resistor, a second resistor, a third resistor, and a fourth resistor. The first inductor, the third capacitor, and the first resistor are connected in series, with the first end of the series connection connected to the main control module and the second end connected to ground. The second inductor, the fourth capacitor, and the second resistor are connected in series, with the first end of the series connection connected to the main control module and the second end connected to ground. The first capacitor and the second capacitor are connected in series, and the series connection node is connected to ground. The first end is connected to the series connection node of the first inductor and the third capacitor, and the second end is connected to the series connection node of the second inductor and the fourth capacitor. The fifth capacitor and the sixth capacitor are connected in series, and the series connection node is connected to ground. The first end is connected to the series connection node of the third capacitor and the first resistor, and the second end is connected to the series connection node of the fourth capacitor and the second resistor. The third resistor is connected in series with the fourth resistor, and the first end of the series connection is connected to the series node of the first resistor and the third capacitor, and the second end is connected to the main control module. The seventh capacitor is connected in series with the eighth capacitor, and the first end of the series connection is connected to the series node of the third resistor and the fourth resistor, and the second end is connected to ground.

3. The circuit for identifying user identity according to claim 1, characterized in that, The plurality of downlink interface modules include a first downlink interface module and at least one second downlink interface module. The power supply module includes a step-down unit and a current limiting unit. The voltage input terminal of the step-down unit is connected to the uplink interface module, and the voltage output terminal is connected to the power supply terminal of the first downlink interface module. The current input terminal of the current limiting unit is connected to the uplink interface module, and the current output terminal is connected to the power supply terminal of each of the second downlink interface modules.

4. The circuit for identifying user identity according to claim 3, characterized in that, The step-down unit includes a step-down chip, a third inductor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth capacitor. The fifth resistor is connected in series between the input terminal and the drive terminal of the step-down chip. The sixth resistor is connected in series between the drive terminal of the step-down chip and the main control module. The seventh resistor and the eighth resistor are connected in series, and the series node is connected to the feedback terminal of the step-down chip. The first end is connected to one end of the third inductor, the power supply terminal of the first downlink interface module, and one end of the ninth capacitor. The second end is connected to ground. The other end of the third inductor is connected to the inductor connection terminal of the step-down chip. The other end of the ninth capacitor is connected to the feedback terminal of the step-down chip. The input terminal of the step-down chip is connected to the uplink interface module.

5. The circuit for identifying user identity according to claim 3, characterized in that, The current limiting unit includes a current limiting chip, a first switching transistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a tenth capacitor. The input terminal of the current limiting chip is connected to the uplink interface module, the output terminal is connected to each of the second downlink interface modules, and the driving terminal is connected to the drain of the first switching transistor. The gate of the first switching transistor is connected to the main control module through the ninth resistor. The tenth resistor is connected in series between the drain of the first switching transistor and the main control module. The eleventh resistor and the twelfth resistor are connected in series, with the first end of the series connection connected to the input terminal of the current limiting unit, the second end connected to ground, and the series connection node connected to the driving terminal of the current limiting chip. The tenth capacitor is connected in parallel with the eleventh resistor, and the thirteenth resistor is connected in series between the current setting terminal of the current limiting chip and ground.

6. The circuit for identifying user identity according to claim 3, characterized in that, The first downlink interface module includes a network control chip, a network filter chip, and a network interface. The power supply terminal of the network control chip is connected to the voltage output terminal of the step-down unit, and its data transmission terminal is connected to the HUB control module. The network filter chip is located between the network control chip and the network interface.

7. The circuit for identifying a user's identity according to any one of claims 1-6, characterized in that, The circuit for identifying user identity also includes a charging interface module, which is connected to the uplink interface module.

8. The circuit for identifying user identity according to claim 7, characterized in that, The circuit for identifying the user's identity also includes an anti-backflow module located between the charging interface module and the uplink interface module, used to limit the current from the charging interface module to flow back to the uplink interface module.

9. The circuit for identifying user identity according to claim 8, characterized in that, The anti-backflow module includes a diode, a second switch, a third switch, a fourth switch, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, and a seventeenth resistor. The positive terminal of the diode is connected to the uplink interface module and the source of the second switch, and the negative terminal is connected to the power supply module and the source of the third switch. The gate of the second switch is connected to the gate of the third switch. The fourteenth and fifteenth resistors are connected in series, with the first end of the series connection connected to the charging interface module and the drain of the fourth switch, and the second end connected to ground. The series connection node is connected to the gate of the second switch and the gate of the third switch. The sixteenth and seventeenth resistors are connected in series, with the first end connected to the drain of the second switch and the drain of the third switch, and the second end connected to ground. The series connection node is connected to the gate of the fourth switch, and the source of the fourth switch is connected to the negative terminal of the diode.

10. A docking station, characterized in that, Includes the circuit for identifying a user as described in any one of claims 1-9.

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