USB interface expansion circuit for intelligent electronic equipment

Abstract

The utility model provides a universal serial bus (USB) interface expansion circuit for intelligent electronic equipment, which comprises a first master-slave equipment change-over switch circuit, wherein the input end of the first master-slave equipment change-over switch circuit is connected with a central processing unit of the intelligent electronic equipment; the output end of the first master-slave device change-over switch circuit is connected with the input end of the second master-slave device change-over switch circuit and the input end of the extended USB interface circuit, and the input end of the first master-slave device change-over switch circuit is further connected with the output end of the second master-slave device change-over switch circuit. The input end of the second master-slave device change-over switch circuit is further connected with a USB interface of the intelligent electronic device, and the input end of the expansion USB interface circuit is connected with the output end of the second master-slave device change-over switch circuit. The utility model has the beneficial effects that the USB interface of the intelligent electronic equipment can be expanded into a plurality of USB interfaces for use, and the expanded USB interfaces support the access of slave equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, and in particular to a USB interface expansion circuit for intelligent electronic equipment. Background Art

[0002] USB interface, namely Universal Serial Bus (English: Universal Serial Bus, abbreviation: USB), is a serial bus standard for connecting computer systems and external devices. It is also a technical specification for input and output interfaces. It is widely used in information and communication products such as personal computers and mobile devices, and has been extended to other related fields such as photographic equipment, digital TVs (set-top boxes), and game consoles. The latest generation is USB 3.1, with a transmission speed of 10Gbit / s, a three-stage voltage of 5V / 12V / 20V, and a maximum power supply of 100W. Type-C is also a connection interface of the USB interface. The new Type-C plug type is no longer divided into positive and negative.

[0003] On the PCI bus, the entity that initiates a PCI transfer transaction is called a master device. The master device should have processing capabilities and be able to control the bus. That is, when a device acts as a master device, it is a bus master. The entity that responds to the transfer transaction is called a slave device, which is also called a target device.

[0004] Many smart electronic devices are generally equipped with standard USB interfaces for charging or data communication. However, smart electronic devices generally have only one USB interface. For example, tablet computers or smart phones generally have only one Type-C interface. Sometimes people think that one USB interface is not enough and need to be expanded to multiple USB interfaces. However, this will cause a problem. The expanded USB interface usually cannot support slave device access. Common slave devices include mouse, keyboard, USB flash drive or other OTG devices. Only the original USB interface supports the access of master and slave devices. Common master devices include computers. Utility Model Content

[0005] In order to solve the problems in the prior art, the utility model provides a USB interface expansion circuit for an intelligent electronic device. By arranging a first master-slave device switching switch circuit, a second master-slave device switching switch circuit and an extended USB interface circuit that cooperate with each other in the USB interface expansion circuit for the intelligent electronic device, the USB interface of the intelligent electronic device can be expanded to multiple USB interfaces for use, and the expanded USB interface supports access to slave devices, thereby solving the problem in the prior art that the extended interface cannot support access to slave devices when the USB interface of the intelligent electronic device is expanded to multiple USB interfaces for use.

[0006] The utility model provides a USB interface expansion circuit for an intelligent electronic device, which is arranged between the USB interface of the intelligent electronic device and the central processor of the intelligent electronic device, and comprises a first master-slave device switching switch circuit, a second master-slave device switching switch circuit and an extended USB interface circuit, wherein the input end of the first master-slave device switching switch circuit is connected to the central processor of the intelligent electronic device, the output end of the first master-slave device switching switch circuit is connected to the input end of the second master-slave device switching switch circuit and the input end of the extended USB interface circuit, the input end of the first master-slave device switching switch circuit is also connected to the output end of the second master-slave device switching switch circuit, the input end of the second master-slave device switching switch circuit is also connected to the USB interface of the intelligent electronic device, the USB interface of the intelligent electronic device can be connected to a master device, the input end of the extended USB interface circuit is connected to the output end of the second master-slave device switching switch circuit, the output end of the extended USB interface circuit can be connected to a slave device, the central processor of the intelligent electronic device can access the master device through the first master-slave device switching switch circuit, the second master-slave device switching switch circuit and the USB interface of the intelligent electronic device for data interaction, and the central processor of the intelligent electronic device can access the slave device through the first master-slave device switching switch circuit and the extended USB interface circuit for data interaction.

[0007] The utility model is further improved, the first master-slave device switching switch circuit is provided with a switching switch chip U1803, the switching switch chip U1803 is provided with 10 pins, the 1st and 2nd pins of the switching switch chip U1803 are connected to the central processor of the intelligent electronic device, the 6th and 7th pins of the switching switch chip U1803 are connected to the input end of the second master-slave device switching switch circuit, the 3rd and 4th pins of the switching switch chip U1803 are connected to the output end of the second master-slave device switching switch circuit, the 8th and 9th pins of the switching switch chip U1803 are connected to the input end of the extended USB interface circuit, and the 5th and 10th pins of the switching switch chip U1803 are grounded.

[0008] The utility model is further improved, the second master-slave device switching switch circuit is provided with a switching switch chip U1807, the switching switch chip U1807 is provided with 10 pins, the 1st and 2nd pins of the switching switch chip U1807 are connected to the USB interface of the intelligent electronic device, the 6th and 7th pins of the switching switch chip U1807 are respectively connected to the 6th and 7th pins of the switching switch chip U1803, the 3rd and 4th pins of the switching switch chip U1807 are connected to the 3rd and 4th pins of the switching switch chip U1803, the 8th and 9th pins of the switching switch chip U1807 are connected to the input end of the extended USB interface circuit, and the 5th and 10th pins of the switching switch chip U1807 are grounded.

[0009] The utility model is further improved, the extended USB interface circuit is provided with a USB extension chip U1806, the USB extension chip U1806 is provided with 17 pins, the 12th and 11th pins of the USB extension chip U1806 are respectively connected to the 8th and 9th pins of the switching switch chip U1803, the 10th and 9th pins of the USB extension chip U1806 are respectively connected to the 8th and 9th pins of the switching switch chip U1807, and the 8th and 7th pins of the USB extension chip U1806 can be connected to the slave device.

[0010] The utility model is further improved, the extended USB interface circuit is also provided with capacitors C1802, C1803 and C1809, the 15th pin of the USB extension chip U1806 is connected to the 16th pin of the USB extension chip U1806, one end of the capacitor C1802, one end of the capacitor C1803, one end of the capacitor C1809, and a 3.3V power supply, and the other end of the capacitor C1802, the other end of the capacitor C1803, the other end of the capacitor C1809, and the 17th pin of the switching switch chip U1807 are grounded.

[0011] The utility model is further improved, and the models of the switching switch chip U1803 and the switching switch chip U1807 are both USB_SWITCH.

[0012] The utility model is further improved, and the model of the USB expansion chip U1806 is CH334P.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: a USB interface expansion circuit for an intelligent electronic device is provided, and by arranging a first master-slave device switching switch circuit, a second master-slave device switching switch circuit and an extended USB interface circuit that cooperate with each other in the USB interface expansion circuit for the intelligent electronic device, the central processor of the intelligent electronic device can access the master device for data interaction through the first master-slave device switching switch circuit, the second master-slave device switching switch circuit and the USB interface of the intelligent electronic device, and the central processor of the intelligent electronic device can access the slave device for data interaction through the first master-slave device switching switch circuit and the extended USB interface circuit, and the USB interface of the intelligent electronic device can be expanded to multiple USB interfaces for use, and the expanded USB interface supports the access of slave devices, which can better meet people's usage needs, and the circuit is simple and stable, which solves the problem in the prior art that the extended interface cannot support the access of slave devices when the USB interface of the intelligent electronic device is expanded to multiple USB interfaces for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a principle block diagram of a USB interface expansion circuit for an intelligent electronic device of the utility model;

[0016] Figure 2 A circuit diagram of a USB interface expansion circuit for an intelligent electronic device according to the utility model;

[0017] Figure 3 A circuit diagram of a USB interface expansion circuit for an intelligent electronic device according to the utility model;

[0018] Figure 4 The utility model is a circuit diagram of a USB interface expansion circuit for an intelligent electronic device. DETAILED DESCRIPTION

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present utility model; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model; the terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present utility model or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0022] like Figure 1-4As shown, the utility model provides a USB interface expansion circuit for an intelligent electronic device, which is arranged between the USB interface of the intelligent electronic device and the central processor of the intelligent electronic device, and includes a first master-slave device switching switch circuit, a second master-slave device switching switch circuit and an extended USB interface circuit. The input end of the first master-slave device switching switch circuit is connected to the central processor of the intelligent electronic device, the output end of the first master-slave device switching switch circuit is connected to the input end of the second master-slave device switching switch circuit and the input end of the extended USB interface circuit, the input end of the first master-slave device switching switch circuit is also connected to the output end of the second master-slave device switching switch circuit, the input end of the second master-slave device switching switch circuit is also connected to the USB interface of the intelligent electronic device, the USB interface of the intelligent electronic device can be connected to a master device, the input end of the extended USB interface circuit is connected to the output end of the second master-slave device switching switch circuit, and the output end of the extended USB interface circuit can be connected to a slave device. In this embodiment, the central processor of the intelligent electronic device can access the host device for data interaction through the first master-slave device switching switch circuit, the second master-slave device switching switch circuit and the USB interface of the intelligent electronic device. The central processor of the intelligent electronic device can access the slave device for data interaction through the first master-slave device switching switch circuit and the extended USB interface circuit. The USB interface of the intelligent electronic device can be expanded to multiple USB interfaces, and the extended USB interface supports the access of slave devices, which can better meet people's usage needs, and the circuit is simple and stable.

[0023] like Figure 2 and 3As shown, the first master-slave device switching switch circuit is provided with a switching switch chip U1803, the models of the switching switch chip U1803 and the switching switch chip U1807 are both USB_SWITCH, the switching switch chip U1803 is provided with 10 pins, the 1st and 2nd pins of the switching switch chip U1803 are connected to the central processor of the intelligent electronic device, the 6th and 7th pins of the switching switch chip U1803 are connected to the input end of the second master-slave device switching switch circuit, the 3rd and 4th pins of the switching switch chip U1803 are connected to the output end of the second master-slave device switching switch circuit, the 8th and 9th pins of the switching switch chip U1803 are connected to the input end of the extended USB interface circuit, and the switching switch The 5th and 10th pins of the chip U1803 are grounded; the second master-slave device switching circuit is provided with a switching chip U1807, the switching chip U1807 is provided with 10 pins, the 1st and 2nd pins of the switching chip U1807 are connected to the USB interface of the intelligent electronic device, the 6th and 7th pins of the switching chip U1807 are respectively connected to the 6th and 7th pins of the switching chip U1803, the 3rd and 4th pins of the switching chip U1807 are connected to the 3rd and 4th pins of the switching chip U1803, the 8th and 9th pins of the switching chip U1807 are connected to the input end of the extended USB interface circuit, and the 5th and 10th pins of the switching chip U1807 are grounded. In this embodiment, when the USB interface of the intelligent electronic device is connected to the host device, the central processor of the intelligent electronic device directly exchanges data with the host device connected to the USB interface of the intelligent electronic device through the first master-slave device switching circuit and the second master-slave device switching circuit.

[0024] like Figure 4As shown, the extended USB interface circuit is provided with a USB expansion chip U1806, the model of the USB expansion chip U1806 is CH334P, the USB expansion chip U1806 has 17 pins, the 12th and 11th pins of the USB expansion chip U1806 are respectively connected to the 8th and 9th pins of the switching chip U1803, the 10th and 9th pins of the USB expansion chip U1806 are respectively connected to the 8th and 9th pins of the switching chip U1807, and the 8th and 7th pins of the USB expansion chip U1806 can When the slave device is connected, the extended USB interface circuit is further provided with capacitors C1802, C1803 and C1809, the 15th pin of the USB extension chip U1806 is connected to the 16th pin of the USB extension chip U1806, one end of the capacitor C1802, one end of the capacitor C1803, one end of the capacitor C1809, and a 3.3V power supply, and the other end of the capacitor C1802, the other end of the capacitor C1803, the other end of the capacitor C1809, and the 17th pin of the switch chip U1807 are grounded. In this embodiment, when the extended USB interface circuit is connected to the slave device, the central processor of the intelligent electronic device exchanges data with the connected slave device through the first master-slave device switch circuit and the extended USB interface circuit.

[0025] As can be seen from the above, the utility model provides a USB interface expansion circuit for an intelligent electronic device. By arranging a first master-slave device switching switch circuit, a second master-slave device switching switch circuit and an extended USB interface circuit that cooperate with each other in the USB interface expansion circuit for the intelligent electronic device, the central processor of the intelligent electronic device can access the master device for data interaction through the first master-slave device switching switch circuit, the second master-slave device switching switch circuit and the USB interface of the intelligent electronic device, and the central processor of the intelligent electronic device can access the slave device for data interaction through the first master-slave device switching switch circuit and the extended USB interface circuit, and the USB interface of the intelligent electronic device can be expanded to multiple USB interfaces for use, and the expanded USB interface supports the access of slave devices, which can better meet people's usage needs. The circuit is simple and stable, and solves the problem in the prior art that the extended interface cannot support the access of slave devices when the USB interface of the intelligent electronic device is expanded to multiple USB interfaces for use.

[0026] The specific implementation methods described above are preferred implementation methods of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. A USB interface expansion circuit for an intelligent electronic device, arranged between the USB interface of the intelligent electronic device and the central processor of the intelligent electronic device, characterized in that: The invention comprises a first master-slave device switching switch circuit, a second master-slave device switching switch circuit and an extended USB interface circuit, wherein the input end of the first master-slave device switching switch circuit is connected to a central processor of an intelligent electronic device, the output end of the first master-slave device switching switch circuit is connected to the input end of the second master-slave device switching switch circuit and the input end of the extended USB interface circuit, the input end of the first master-slave device switching switch circuit is also connected to the output end of the second master-slave device switching switch circuit, the input end of the second master-slave device switching switch circuit is also connected to a USB interface of the intelligent electronic device, the USB interface of the intelligent electronic device can be connected to a master device, the input end of the extended USB interface circuit is connected to the output end of the second master-slave device switching switch circuit, the output end of the extended USB interface circuit can be connected to a slave device, the central processor of the intelligent electronic device can access the master device through the first master-slave device switching switch circuit, the second master-slave device switching switch circuit and the USB interface of the intelligent electronic device for data interaction, and the central processor of the intelligent electronic device can access the slave device through the first master-slave device switching switch circuit and the extended USB interface circuit for data interaction.

2. The USB interface expansion circuit for an intelligent electronic device according to claim 1, characterized in that: The first master-slave device switching switch circuit is provided with a switching switch chip U1803, and the switching switch chip U1803 is provided with 10 pins. The 1st and 2nd pins of the switching switch chip U1803 are connected to the central processor of the intelligent electronic device, the 6th and 7th pins of the switching switch chip U1803 are connected to the input end of the second master-slave device switching switch circuit, the 3rd and 4th pins of the switching switch chip U1803 are connected to the output end of the second master-slave device switching switch circuit, the 8th and 9th pins of the switching switch chip U1803 are connected to the input end of the extended USB interface circuit, and the 5th and 10th pins of the switching switch chip U1803 are grounded.

3. The USB interface expansion circuit for an intelligent electronic device according to claim 2, characterized in that: The second master-slave device switching switch circuit is provided with a switching switch chip U1807, and the switching switch chip U1807 is provided with 10 pins. The 1st and 2nd pins of the switching switch chip U1807 are connected to the USB interface of the intelligent electronic device, the 6th and 7th pins of the switching switch chip U1807 are respectively connected to the 6th and 7th pins of the switching switch chip U1803, the 3rd and 4th pins of the switching switch chip U1807 are connected to the 3rd and 4th pins of the switching switch chip U1803, the 8th and 9th pins of the switching switch chip U1807 are connected to the input end of the extended USB interface circuit, and the 5th and 10th pins of the switching switch chip U1807 are grounded.

4. The USB interface expansion circuit for an intelligent electronic device according to claim 3, characterized in that: The extended USB interface circuit is provided with a USB extension chip U1806, and the USB extension chip U1806 is provided with 17 pins. The 12th and 11th pins of the USB extension chip U1806 are respectively connected to the 8th and 9th pins of the switching switch chip U1803, and the 10th and 9th pins of the USB extension chip U1806 are respectively connected to the 8th and 9th pins of the switching switch chip U1807, and the 8th and 7th pins of the USB extension chip U1806 can be connected to the slave device.

5. The USB interface expansion circuit for an intelligent electronic device according to claim 4, characterized in that: The extended USB interface circuit is also provided with capacitors C1802, C1803 and C1809. The 15th pin of the USB extension chip U1806 is connected to the 16th pin of the USB extension chip U1806, one end of the capacitor C1802, one end of the capacitor C1803, one end of the capacitor C1809, and a 3.3V power supply. The other end of the capacitor C1802, the other end of the capacitor C1803, the other end of the capacitor C1809, and the 17th pin of the switching switch chip U1807 are grounded.

6. The USB interface expansion circuit for an intelligent electronic device according to claim 5, characterized in that: The models of the switching switch chip U1803 and the switching switch chip U1807 are both USB_SWITCH.

7. The USB interface expansion circuit for an intelligent electronic device according to claim 6, characterized in that: The model of the USB expansion chip U1806 is CH334P.

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