A switching circuit for plug-free connection of a plurality of signal sources

Abstract

The utility model discloses a kind of switching circuit for connecting multiple signal source ends exempt from plugging, including MCU, HDMI switch and USB switch group, MCU is connected with HDMI switch by fourth input and output pin GPIO4, HDMI switch includes two HDMI interfaces, two HDMI interfaces are respectively marked as HDMI interface 1 and HDMI interface 2, when fourth input and output pin GPIO4 output low level, HDMI interface 1 on HDMI switch is in gating state, HDMI interface 2 is in closed state;When fourth input and output pin GPIO4 output high level, HDMI interface 1 on HDMI switch is in closed state, HDMI interface 2 is in gating state, USB switch group includes two USB switch 1 and USB switch 2, USB switch 1 and USB switch 2 jointly form two USB interfaces.The utility model can be well implemented without plugging (i.e. exempt from plugging) to switch connection to different signal source by target device.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, specifically a switching circuit for connecting multiple signal source terminals without plugging or unplugging. Background Technology

[0002] Many electronic devices require external signal sources to perform certain functions. For example, common all-in-one conference systems require external signal sources to play videos, PowerPoint presentations, and other text and image content. When switching from one signal source to another, current technology typically involves unplugging the cable from the current source and plugging it back in. Existing electronic devices generally connect signal sources via HDMI and / or USB cables. This existing technology requires plugging and unplugging cables (such as HDMI or USB cables) to connect different signal sources, which is cumbersome and can shorten the lifespan of the cables after excessive plugging and unplugging. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a switching circuit for connecting multiple signal source terminals without plugging and unplugging, which can solve the problems described in the background art.

[0004] The technical solution to achieve the purpose of this utility model is as follows: a switching circuit for connecting multiple signal source terminals without plugging and unplugging, including an MCU, an HDMI switch, and a USB switch group. The MCU is connected to the HDMI switch via a fourth input / output pin GPIO4. The HDMI switch includes two HDMI interfaces, denoted as HDMI interface 1 and HDMI interface 2. When the fourth input / output pin GPIO4 outputs a low level, HDMI interface 1 on the HDMI switch is in the selected state, and HDMI interface 2 is in the closed state; when the fourth input / output pin GPIO4 outputs a high level, HDMI interface 1 on the HDMI switch is in the closed state, and HDMI interface 2 is in the selected state.

[0005] The USB switch assembly includes two USB switches, 1 and 2, which together form two USB ports.

[0006] The MCU connects to the respective operating status pins of USB switch 1 and USB switch 2 via its first input and output pin GPIO1.

[0007] The MCU connects to the mode selection pins of USB switch 1 and USB switch 2 via its second input and output pin GPIO2, respectively.

[0008] The MCU is used to select one of the two USB interfaces by controlling the high and low levels output by the first input and output pins GPIO1 and GPIO2.

[0009] Furthermore, the HDMI switch includes the HDMI interface chip U40.

[0010] Furthermore, the HDMI interface chip U40 has the model number PI3HDMI521.

[0011] Furthermore, when the first input and output pin GPIO1 outputs a low level, both USB switch 1 and USB switch 2 are in normal working condition; when the first input and output pin GPIO1 outputs a high level, both USB switch 1 and USB switch 2 are in the off state.

[0012] Furthermore, when the second input and output pin GPIO2 outputs a low level, the USB switch group selects the USB A interface; when the second input and output pin GPIO2 outputs a high level, the USB switch group selects the USB B interface.

[0013] Furthermore, USB switch 1 includes a USB interface chip U38, and USB switch 2 includes a USB interface chip U37.

[0014] Furthermore, the USB interface chip U38 has the model number SGM7227YUWQ10G / TR, and the USB interface chip U37 has the model number FUSB340TMX(TMLP-18).

[0015] Furthermore, pins SSTX1-, SSTX1+, SSRX1-, and SSRX1+ on the USB interface chip U37 and pins M+ and M- on the USB interface chip U38 constitute one USB interface; pins SSTX2-, SSTX2+, SSRX2-, and SSRX2+ on the USB interface chip U37 and pins D+ and D- on the USB interface chip U38 constitute another USB interface.

[0016] Furthermore, it also includes a HUB chip U94, a USB switching group connected to the HUB chip U94, the HUB chip U94 includes several USB interfaces, and the MCU is connected to the HUB chip U94 through the third input and output pin GPIO3.

[0017] Furthermore, pins Y+ and Y- of the USB interface chip U38 are connected to pins DP0 and DM0 of the HUB chip U94, respectively, and pins SSTXCOM-, SSTXCOM+, SSRXCOM-, and SSRXCOM+ of the USB interface chip U37 are connected to pins RXN_UP, RXP_UP, TXN_UP, and TXP_UP of the HUB chip U94, respectively.

[0018] The beneficial effects of this utility model are: This utility model can effectively switch the target device to different signal sources without plugging or unplugging (i.e., plugging and unplugging), which improves the convenience of operation, the service life of the connection cable, and the user experience. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the principle framework of this utility model;

[0020] Figure 2 This is a circuit diagram of an HDM switching switch;

[0021] Figure 3 This is a circuit diagram of USB switch 1;

[0022] Figure 4 This is a circuit diagram of USB switch 2;

[0023] Figure 5 This is a circuit diagram of the HUB chip U94. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0025] like Figures 1-5 As shown, a switching circuit for plug-and-play connection of multiple signal sources includes an MCU, an HDMI switch, and a USB switch group. The MCU is connected to the HDMI switch via a fourth input / output pin GPIO4. The HDMI switch includes two HDMI interfaces, denoted as HDMI interface 1 and HDMI interface 2. When the fourth input / output pin GPIO4 outputs a low level, HDMI interface 1 on the HDMI switch is in the enabled state, and HDMI interface 2 is in the disabled state; when the fourth input / output pin GPIO4 outputs a high level, HDMI interface 1 on the HDMI switch is in the disabled state, and HDMI interface 2 is in the enabled state. In other words, the MCU controls the output of the fourth input / output pin GPIO4 to enable one of the two HDMI interfaces on the HDMI switch.

[0026] refer to Figure 1 and Figure 2 In the diagram, HDMIIN A represents HDMI interface 1, and HDMIIN B represents HDMI interface 2. Figure 2 The HDMI switch in the system includes an HDMI interface chip U40, model number PI3HDMI521, although other models of HDMI interface chips can also be used. The HDMI interface chip U40 includes at least two HDMI ports; the diagram shows three HDMI ports.

[0027] The USB switch group includes two USB switches, 1 and 2, which together form two USB ports (corresponding to...). Figure 1 The diagram illustrates USB A and USB B interfaces. The MCU connects to USB switch 1 and USB switch 2 via its first input / output pin GPIO1, respectively, to their respective operating status pins. When GPIO1 outputs a low level, both USB switch 1 and USB switch 2 are in normal operating condition; when GPIO1 outputs a high level, both USB switch 1 and USB switch 2 are in the off state. The MCU connects to USB switch 1 and USB switch 2 via its second input / output pin GPIO2, respectively, to their respective mode selection pins. When GPIO2 outputs a low level, the USB switch group selects the USB A interface; when GPIO2 outputs a high level, the USB switch group selects the USB B interface.

[0028] For example, both USB ports of the USB switch group are either USB 3.0 ports or both are Type-C ports.

[0029] refer to Figure 3 and Figure 4 USB switch 1 includes a USB interface chip U38, model number SGM7227YUWQ10G / TR. USB switch 2 includes a USB interface chip U37, model number FUSB340TMX(TMLP-18).

[0030] Pins SSTX1-, SSTX1+, SSRX1-, and SSRX1+ on USB interface chip U37 and pins M+ and M- on USB interface chip U38 constitute a USB interface (USB A interface); pins SSTX2-, SSTX2+, SSRX2-, and SSRX2+ on USB interface chip U37 and pins D+ and D- on USB interface chip U38 constitute another USB interface (USB B interface).

[0031] The SEL pin of the USB interface chip U38 is the mode selection pin, and the / OE pin is the operating status pin. Pins SEL and / OE are connected to the first input and output pins GPIO2 and GPIO1, respectively. Similarly, the SEL pin of the USB interface chip U37 is the mode selection pin, and the / OE pin is the operating status pin. Pins SEL and / OE are connected to the first input and output pins GPIO2 and GPIO1, respectively.

[0032] In practical use, the target signal source typically includes both an HDMI port and a USB port. Therefore, it is possible to connect to a target signal source simultaneously via both the HDMI port and the USB port. For ease of description, HDMI port 1 and USB A port are used to connect to one signal source A, and HDMI port 2 and USB B port are used to connect to another signal source B.

[0033] When the MCU's fourth input / output pin GPIO4 outputs a low level, the HDMI switch selects HDMI interface 1. Simultaneously, the MCU outputs a low level on both the second and third input / output pins GPIO2 and GPIO3. After a preset time (e.g., 100ms), the third input / output pin GPIO3 returns to a high level. When the second input / output pin GPIO2 outputs a low level, the USB switch selects USB A interface. At this time, signal source A connected through HDMI interface 1 and USB A interface can communicate with the target device (e.g., a conference all-in-one machine). This ensures that signal source A maintains an electrical connection with the target device through the switching circuit of this embodiment, allowing the signal source (e.g., a view) on signal source A to be output to the target device.

[0034] Similarly, when the MCU's fourth input / output pin GPIO4 outputs a high level, the HDMI switch selects HDMI interface 2. Simultaneously, the MCU outputs a high level on the second input / output pin GPIO2 and a low level on the third input / output pin GPIO3. The third input / output pin GPIO3 returns to a high level after a preset time (e.g., 100ms). When the second input / output pin GPIO2 outputs a high level, the USB switch selects USB interface B. At this time, the signal source terminal B connected through HDMI interface 2 and USB interface B can communicate with the target device (e.g., a conference all-in-one machine). This means that the signal source terminal B maintains an electrical connection with the target device through the switching circuit of this embodiment, thereby enabling the signal source (e.g., a view) on signal source terminal B to output to the target device.

[0035] Thus, the switching between signal source A and signal source B can be achieved by controlling the output level of the three pins through the MCU.

[0036] For example, in order to add more USB interfaces, a HUB chip U94 is also included. The USB switching switch group is connected to the HUB chip U94. The HUB chip U94 includes several USB interfaces. The MCU is connected to the HUB chip U94 through the third input and output pin GPIO3.

[0037] Specifically, pins Y+ and Y- of USB interface chip U38 are connected to the corresponding pins of HUB chip U94, and pins SSTXCOM-, SSTXCOM+, SSRXCOM-, and SSRXCOM+ of USB interface chip U37 are connected to the corresponding pins of HUB chip U94.

[0038] refer to Figures 3-5 Pins Y+ and Y- of USB interface chip U38 are connected to pins DP0 and DM0 of HUB chip U94, respectively. Pins SSTXCOM-, SSTXCOM+, SSRXCOM-, and SSRXCOM+ of USB interface chip U37 are connected to pins RXN_UP, RXP_UP, TXN_UP, and TXP_UP of HUB chip U94, respectively.

[0039] refer to Figure 5 The HUB chip U94 has the model number GL3510-OSY52(QFN64(4-DFP)). The HUB chip U94 includes four USB ports (USB1, USB2, USB3 and USB4) and can also form a USPORT interface.

[0040] This invention enables the target device to be switched to different signal sources without plugging or unplugging, improving ease of operation, lifespan of the connection cable, and user experience.

[0041] The embodiments disclosed in this specification are merely illustrative of one aspect of the features of this utility model. The protection scope of this utility model is not limited to this embodiment, and any other functionally equivalent embodiments fall within the protection scope of this utility model. Those skilled in the art can make various other corresponding changes and modifications based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this utility model.

Claims

1. A switching circuit for connecting multiple signal source terminals without plugging or unplugging, characterized in that, The system includes an MCU, an HDMI switch, and a USB switch group. The MCU is connected to the HDMI switch via its fourth input / output pin, GPIO4. The HDMI switch has two HDMI ports, designated HDMI1 and HDMI2. When GPIO4 outputs a low level, HDMI1 is enabled and HDMI2 is disabled. When GPIO4 outputs a high level, HDMI1 is disabled and HDMI2 is enabled. The USB switch assembly includes two USB switches, 1 and 2, which together form two USB ports. The MCU connects to the USB switch 1 and USB switch 2 via its first input and output pin GPIO1, respectively, and their respective operating status pins. The MCU connects to the mode selection pins of USB switch 1 and USB switch 2 via its second input and output pin GPIO2, respectively. The MCU is used to select one of the two USB interfaces by controlling the high and low levels output by the first input and output pins GPIO1 and GPIO2.

2. The switching circuit for non-plugging connection of multiple signal source terminals according to claim 1, characterized in that, The HDMI switch includes the HDMI interface chip U40.

3. The switching circuit for non-plugging connection of multiple signal source terminals according to claim 2, characterized in that, The HDMI interface chip U40 has the model number PI3HDMI521.

4. The switching circuit for non-plugging connection of multiple signal source terminals according to claim 1, characterized in that, When the first input and output pin GPIO1 outputs a low level, both USB switch 1 and USB switch 2 are in normal working condition; when the first input and output pin GPIO1 outputs a high level, both USB switch 1 and USB switch 2 are in the off state.

5. The switching circuit for non-plugging connection of multiple signal source terminals according to claim 4, characterized in that, When the second input and output pin GPIO2 outputs a low level, the USB switch group selects the USB A interface; when the second input and output pin GPIO2 outputs a high level, the USB switch group selects the USB B interface.

6. The switching circuit for non-plugging connection of multiple signal source terminals according to claim 1, characterized in that, USB switch 1 includes a USB interface chip U38, and USB switch 2 includes a USB interface chip U37.

7. The switching circuit for non-plugging connection of multiple signal source terminals according to claim 6, characterized in that, The USB interface chip U38 has the model number SGM7227YUWQ10G / TR, and the USB interface chip U37 has the model number FUSB340TMX.

8. The switching circuit for non-plugging connection of multiple signal source terminals according to claim 7, characterized in that, Pins SSTX1-, SSTX1+, SSRX1-, and SSRX1+ on USB interface chip U37 and pins M+ and M- on USB interface chip U38 constitute one USB interface; pins SSTX2-, SSTX2+, SSRX2-, and SSRX2+ on USB interface chip U37 and pins D+ and D- on USB interface chip U38 constitute another USB interface.

9. The switching circuit for non-plugging connection of multiple signal source terminals according to any one of claims 1-8, characterized in that, It also includes a HUB chip U94, a USB switch group connected to the HUB chip U94, the HUB chip U94 includes several USB interfaces, and the MCU is connected to the HUB chip U94 through the third input and output pin GPIO3.

10. The switching circuit for non-plugging connection of multiple signal source terminals according to claim 9, characterized in that, Pins Y+ and Y- of USB interface chip U38 are connected to pins DP0 and DM0 of HUB chip U94, respectively. Pins SSTXCOM-, SSTXCOM+, SSRXCOM-, and SSRXCOM+ of USB interface chip U37 are connected to pins RXN_UP, RXP_UP, TXN_UP, and TXP_UP of HUB chip U94, respectively.

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