A USB hub with a controllable USB interface

Abstract

This utility model discloses a USB hub with a controllable USB interface, comprising: an input USB interface, several output USB interfaces, several power supply control chips, a hub expansion circuit, an MCU chip, a USB-to-serial chip, and an external voltage input circuit. The control pins of the power supply control chips are electrically connected to the MCU chip, the VIN pin of the power supply control chip is electrically connected to the voltage output terminal of the external voltage input circuit, and the VOUT pin of the power supply control chip is electrically connected to the VCC pin of the output USB interface. This utility model avoids insufficient power supply to the computer's USB ports by setting up a dedicated external voltage input circuit to supply power to the output USB interfaces. The MCU chip controls the power supply control chips to control the input voltage at the voltage output terminal to the VCC pin of the output USB interface, thereby controlling the VBUS output of the output USB interface.

Description

Technical Field

[0001] This utility model relates to the field of USB hub technology, and in particular to a USB hub with a controllable USB interface. Background Technology

[0002] Most USB hubs on the market today are designed for direct output, serving only as an extension device. Some hubs also have a switch to control the output, but in some situations, it is necessary to automatically control the power-on and identification of the product under test, which traditional hubs cannot meet.

[0003] Therefore, existing technologies have shortcomings and need to be improved. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a USB hub with controllable USB interface, which can power on and identify each extended USB interface to meet the application needs of various scenarios.

[0005] The technical solution of this utility model is as follows: A USB hub with a controllable USB interface is provided, comprising: an input USB interface, several output USB interfaces, several power supply control chips, a hub expansion circuit, an MCU chip, a USB-to-serial chip, and an external voltage input circuit; the signal lines of the input USB interfaces are electrically connected to the hub expansion circuit, and the signal lines of the output USB interfaces are electrically connected to the hub expansion circuit; the MCU chip is electrically connected to the hub expansion circuit via the USB-to-serial chip; the control pins of the power supply control chips are electrically connected to the MCU chip, the VIN pin of the power supply control chip is electrically connected to the voltage output terminal of the external voltage input circuit, and the VOUT pin of the power supply control chip is electrically connected to the VCC pin of the output USB interfaces.

[0006] The signal lines of the input USB interface are electrically connected to the hub expansion circuit, and the signal lines of the output USB interface are also electrically connected to the hub expansion circuit, in the same way as traditional USB hub connections. In this solution, a dedicated external voltage input circuit is used to power the output USB interface, thus avoiding insufficient power supply to the computer's USB ports. The MCU chip controls the power supply control chip to control the input voltage to the VCC pin of the output USB interface, thereby controlling the VBUS output of the output USB interface. Therefore, this solution, under the condition of a single USB port input, simultaneously meets the production testing requirements for USB expansion and power-on / off of the product under test, satisfying actual batch verification needs, and is stable and convenient.

[0007] Furthermore, the external voltage input circuit includes: an external voltage input interface, a voltage regulator chip electrically connected to the external voltage input interface, and a voltage output terminal electrically connected to the voltage regulator chip.

[0008] Furthermore, the external voltage input circuit also includes a power supply indicator light, one end of which is electrically connected to the voltage output terminal and the other end is grounded. The power supply indicator light is used to indicate that an external power source is connected to the external voltage input circuit.

[0009] Furthermore, the USB hub with controllable USB interface also includes several control indicator lights, which are electrically connected to the MCU chip. The control indicator lights are used to indicate whether the output USB interface is in a powered-on operating state.

[0010] Furthermore, the USB hub with controllable USB interface also includes: several TVS anti-static tubes; the input USB interface and the output USB interface are each electrically connected to a TVS anti-static tube.

[0011] By adopting the above solution, this utility model provides a USB hub with a controllable USB interface. By setting up a dedicated external voltage input circuit to power the output USB interface, it avoids insufficient power supply to the computer's USB ports. The MCU chip controls the power supply control chip to control the input voltage to the VCC pin of the output USB interface, thereby controlling the VBUS output of the output USB interface. Therefore, this solution simultaneously meets the production testing requirements for USB expansion and power-on / off of the product under test under the same USB port input, satisfying actual batch verification needs, and is stable and convenient. Attached Figure Description

[0012] Figure 1 This is a circuit connection diagram of the MCU chip of this utility model;

[0013] Figure 2 This is the circuit connection diagram for a USB to serial port chip.

[0014] Figure 3 Circuit connection diagram for the USB input interface and hub expansion circuit;

[0015] Figure 4 Circuit connection diagram for output USB interface and power supply control chip;

[0016] Figure 5 The circuit schematic for the external voltage input circuit;

[0017] Figure 6 This is a circuit connection diagram for controlling the indicator light. Detailed Implementation

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Please see Figures 1-6 This embodiment provides a USB hub with a controllable USB interface, including: an input USB interface 10, several output USB interfaces 11, several power supply control chips 12, a hub expansion circuit 13, an MCU chip 14, a USB-to-serial chip 15, and an external voltage input circuit. The signal lines of the input USB interface 10 are electrically connected to the hub expansion circuit 13, and the signal lines of the output USB interfaces 11 are also electrically connected to the hub expansion circuit 13. The MCU chip 14 is electrically connected to the hub expansion circuit 13 via the USB-to-serial chip 15. The control pins of the power supply control chips 12 are electrically connected to the MCU chip 14, the VIN pin of the power supply control chip 12 is electrically connected to the voltage output terminal 18 of the external voltage input circuit, and the VOUT pin of the power supply control chip 12 is electrically connected to the VCC pin of the output USB interfaces 11. In this embodiment, there are six output USB interfaces and six power supply control chips. The power supply control chip is an electronic switch; in this embodiment, an LMC7660IMX is selected.

[0020] The signal lines of the input USB interface 10 are electrically connected to the hub expansion circuit 13, and the signal lines of the output USB interface 11 are also electrically connected to the hub expansion circuit 13, in the same way as traditional USB hub connections. In this solution, a dedicated external voltage input circuit is provided to power the output USB interface 11, thus avoiding insufficient power supply to the computer's USB ports. The MCU chip 14 controls the input voltage to the VCC pin of the output USB interface 11 via the power supply control chip 12, thereby controlling the VBUS output of the output USB interface 11. Therefore, this solution simultaneously meets the production testing requirements for USB expansion and power-on / off of the product under test under the same USB port input, satisfying actual batch verification needs, and is stable and convenient.

[0021] In this embodiment, the external voltage input circuit includes: an external voltage input interface 16, a voltage regulator chip 17 electrically connected to the external voltage input interface 16, and a voltage output terminal 18 electrically connected to the voltage regulator chip 17.

[0022] In this embodiment, the external voltage input circuit further includes a power supply indicator light 19, one end of which is electrically connected to the voltage output terminal 18 and the other end is grounded. The power supply indicator light 19 is used to indicate that an external power source is connected to the external voltage input circuit.

[0023] In this embodiment, the USB hub with controllable USB interface further includes: a plurality of control indicator lights 20, which are electrically connected to the MCU chip 14. The control indicator lights 20 are used to indicate whether the output USB interface 11 is in a powered-on working state. In this embodiment, there are six control indicator lights, each corresponding to one output USB interface, and the control indicator lights are used to indicate the status of the output USB interface.

[0024] In this embodiment, the USB hub with controllable USB interface further includes: a plurality of TVS antistatic tubes 21; the input USB interface 10 and the output USB interface 11 are respectively electrically connected to a TVS antistatic tube 21.

[0025] In summary, this invention provides a USB hub with a controllable USB interface. By setting up a dedicated external voltage input circuit to power the output USB interface, it avoids insufficient power supply to the computer's USB ports. The MCU chip controls the power supply control chip to control the input voltage to the VCC pin of the output USB interface, thereby controlling the VBUS output of the output USB interface. Therefore, this solution simultaneously meets the production testing requirements for USB expansion and power-on / off of the product under test under the condition of a single USB port input, satisfying actual batch verification needs, and is stable and convenient.

[0026] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A USB hub with a controllable USB interface, characterized in that, include: The system comprises an input USB interface, several output USB interfaces, several power supply control chips, a hub expansion circuit, an MCU chip, a USB-to-serial chip, and an external voltage input circuit. The signal lines of the input USB interfaces are electrically connected to the hub expansion circuit, and the signal lines of the output USB interfaces are also electrically connected to the hub expansion circuit. The MCU chip is electrically connected to the hub expansion circuit via the USB-to-serial chip. The control pins of the power supply control chips are electrically connected to the MCU chip, the VIN pin of the power supply control chips is electrically connected to the voltage output terminal of the external voltage input circuit, and the VOUT pin of the power supply control chips is electrically connected to the VCC pin of the output USB interfaces.

2. A USB hub with a controllable USB interface according to claim 1, characterized in that, The external voltage input circuit includes: an external voltage input interface, a voltage regulator chip electrically connected to the external voltage input interface, and a voltage output terminal electrically connected to the voltage regulator chip.

3. A USB hub with a controllable USB interface according to claim 2, characterized in that, The external voltage input circuit also includes a power supply indicator light, one end of which is electrically connected to the voltage output terminal and the other end is grounded.

4. A USB hub with a controllable USB interface according to claim 1, characterized in that, Also includes: Several control indicator lights are provided, and the control indicator lights are electrically connected to the MCU chip.

5. A USB hub with a controllable USB interface according to claim 1, characterized in that, Also includes: Several TVS antistatic tubes; the input USB interface and the output USB interface are each electrically connected to one TVS antistatic tube.

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