A USB multiplexing circuit
By designing a USB multiplexing circuit and utilizing components such as switching chips and impedance matching resistors, the multiplexing of USB interfaces in ultrasonic welding equipment was realized, solving the problem of excessive interface space occupation and improving ease of use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HISILICON (GUANGDONG) ULTRASONIC TECHNOLOGY CO LTD
- Filing Date
- 2025-08-21
- Publication Date
- 2026-07-17
AI Technical Summary
In ultrasonic welding equipment, the ultrasonic power supply is connected through multiple USB interfaces, which results in a large amount of interface space being occupied and inconvenience in use.
Design a USB multiplexing circuit, including a USB interface, a switch chip, an interface and a control unit. The multiplexing of the USB interface is realized by the switch chip U1. The impedance matching resistor and the current limiting resistor are used for protection circuit, and the filter capacitor is used for signal matching and current limiting.
It enables a single USB interface to serve multiple devices simultaneously, reducing the number of USB interfaces and lowering debugging and user adaptation costs.
Smart Images
Figure CN224519309U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of USB interface circuits, and specifically relates to a USB multiplexing circuit. Background Technology
[0002] In ultrasonic welding equipment, the ultrasonic power supply usually needs to be connected to the control unit and the equipment through multiple USB interfaces, which takes up a lot of interface space and is not convenient to use. Utility Model Content
[0003] To address the aforementioned issues, the present invention aims to provide a USB multiplexing circuit that reduces the number of USB interfaces required, lowers the adaptation costs for debuggers and users, and makes it more convenient to use.
[0004] To achieve the above objectives, the technical solution of this utility model is as follows:
[0005] This utility model provides a USB multiplexing circuit, including: a USB interface J1, a switch chip U1, an interface J2, an interface J3, and a control unit U2. The second pin of the USB interface J1 is connected to the fourth pin of the switch chip U1, and the third pin of the USB interface J1 is connected to the third pin of the switch chip U1. The second pin of the switch chip U1 is connected to the control unit U2. The sixth pin of the switch chip U1 is connected to the second pin of the interface J2, and the seventh pin of the switch chip U1 is connected to the third pin of the interface J2. The interface J3 is connected to the control unit U2.
[0006] Furthermore, interface J2 is used to connect to the USB port of Device2 of an external device, and interface J3 is used to connect to the data port of control unit U2 for data interaction and control of switch switching timing.
[0007] Furthermore, the switch chip U1 is model FSUSB42MUX, which is a double-pole double-throw digital switch, and the switching selection is performed through pin 2. The logic switching principle is as follows: the control unit U2 interacts with the J3 interface of Device2 through the serial port for basic data exchange, and at different times switches the USB to different devices for external access control.
[0008] Furthermore, the circuit also includes impedance matching resistors R1 and R2. Pin 2 of the USB interface J1 is connected to pin 4 of the switching chip U1 through impedance matching resistor R2, and pin 3 of the USB interface J1 is connected to pin 3 of the switching chip U1 through impedance matching resistor R1. Impedance matching resistors R1 and R2 can match the impedance of the USB cable, reducing signal reflection.
[0009] Furthermore, the circuit also includes a current-limiting resistor R3 and a diode D1. One end of the current-limiting resistor is connected to a 5V_In signal, and the other end is connected to pin 1 of the switching chip U1 through the diode D1. The current-limiting resistor R3 can protect the external USB power supply and limit the external USB current from exceeding a specified range; the diode D1 can prevent the internal power supply from flowing back to the external source.
[0010] Furthermore, the circuit also includes a filter capacitor C1, one end of which is connected to pin 1 of the switching chip U1, and the other end is connected to pin 5 of the switching chip U1.
[0011] The beneficial effects of this utility model are as follows: Compared with the prior art, this circuit uses a high-speed switching chip U1 to allocate the only external USB interface J1 to the control unit U2 or interface J2 in a timely manner. Interface J2 can connect to the external device Device2. The control unit and device can be upgraded and data exported simultaneously through a single USB, thereby reducing the number of external USB ports and reducing the adaptation costs for debuggers and users. Attached Figure Description
[0012] Figure 1 This is a block diagram of a USB multiplexing circuit.
[0013] Figure 2 This is the circuit diagram of a USB multiplexing circuit.
[0014] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.
[0015] Figure 4 yes Figure 2 A magnified view of a section at point B in the middle.
[0016] Figure 5 yes Figure 2 A magnified view of a section at point C. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages 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 understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0018] To achieve the above objectives, the technical solution of this utility model is as follows:
[0019] See Figure 1-5 As shown, this embodiment provides a USB multiplexing circuit, including:
[0020] The system comprises a USB interface J1, a switch chip U1, an interface J2, an interface J3, and a control unit U2. Pin 2 of the USB interface J1 is connected to pin 4 of the switch chip U1, and pin 3 of the USB interface J1 is connected to pin 3 of the switch chip U1. Pin 2 of the switch chip U1 is connected to the control unit U2. Pin 6 of the switch chip U1 is connected to pin 2 of the interface J2, and pin 7 of the switch chip U1 is connected to pin 3 of the interface J2. Interface J3 is connected to the control unit U2.
[0021] In this application, interface J2 is used to connect to the USB port of Device2 of an external device, and interface J3 is used to connect to the data port of control unit U2 for data interaction and control of switch switching timing.
[0022] This circuit uses a high-speed switching chip U1 to allocate the only external USB interface J1 to the control unit U2 or interface J2 as needed. Interface J2 can connect to the external device Device2. Upgrades and data export operations can be performed on the control unit and device simultaneously through a single USB port, thereby reducing the number of external USB ports and alleviating the adaptation costs for debuggers and users.
[0023] Furthermore, the switch chip U1 is model FSUSB42MUX, which is a double-pole double-throw digital switch, and the switching selection is performed through pin 2. The logic switching principle is as follows: the control unit U2 interacts with the J3 interface of Device2 through the serial port for basic data exchange, and at different times switches the USB to different devices for external access control.
[0024] Furthermore, the circuit also includes impedance matching resistors R1 and R2. Pin 2 of the USB interface J1 is connected to pin 4 of the switching chip U1 through impedance matching resistor R2, and pin 3 of the USB interface J1 is connected to pin 3 of the switching chip U1 through impedance matching resistor R1. Impedance matching resistors R1 and R2 can match the impedance of the USB cable, reducing signal reflection.
[0025] Furthermore, the circuit also includes a current-limiting resistor R3 and a diode D1. One end of the current-limiting resistor is connected to a 5V_In signal, and the other end is connected to pin 1 of the switching chip U1 through the diode D1. The current-limiting resistor R3 can protect the external USB power supply and limit the external USB current from exceeding a specified range; the diode D1 can prevent the internal power supply from flowing back to the external source.
[0026] Furthermore, the circuit also includes a filter capacitor C1, one end of which is connected to pin 1 of the switching chip U1, and the other end is connected to pin 5 of the switching chip U1.
[0027] 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 multiplexing circuit, characterized by, include: The system comprises a USB interface J1, a switch chip U1, an interface J2, an interface J3, and a control unit U2. Pin 2 of the USB interface J1 is connected to pin 4 of the switch chip U1, and pin 3 of the USB interface J1 is connected to pin 3 of the switch chip U1. Pin 2 of the switch chip U1 is connected to the control unit U2. Pin 6 of the switch chip U1 is connected to pin 2 of the interface J2, and pin 7 of the switch chip U1 is connected to pin 3 of the interface J2. Interface J3 is connected to the control unit U2.
2. A USB multiplexing circuit as claimed in claim 1, characterized in that, The switching chip U1 is model FSUSB42MUX.
3. The USB multiplexing circuit of claim 1, wherein, The circuit also includes impedance matching resistors R1 and R2. The second pin of the USB interface J1 is connected to the fourth pin of the switching chip U1 through the impedance matching resistor R2, and the third pin of the USB interface J1 is connected to the third pin of the switching chip U1 through the impedance matching resistor R1.
4. The USB multiplexing circuit of claim 1, wherein, The circuit also includes a current-limiting resistor R3 and a diode D1. One end of the current-limiting resistor is connected to a 5V_In signal, and the other end is connected to pin 1 of the switching chip U1 through the diode D1.
5. The USB multiplexing circuit of claim 1, wherein, The circuit also includes a filter capacitor C1, one end of which is connected to pin 1 of the switch chip U1, and the other end is connected to pin 5 of the switch chip U1.