A KVM switch with screen splitting

Abstract

This utility model discloses a KVM switch with screen splitting, belonging to the field of computer technology. The mouse and keyboard interfaces are electrically connected to the computer's VGA and PS / 2 interfaces, with each VGA and PS / 2 interface corresponding to a specific computer host. A VGA-to-HDMI chip also corresponds to a specific computer VGA and PS / 2 interface. The input of the VGA-to-HDMI chip is electrically connected to the corresponding computer host via the VGA and PS / 2 interfaces. The output of the VGA-to-HDMI chip is electrically connected to the input of a video splitting processing chip, which in turn is electrically connected to the input of an HDMI-to-VGA chip. The output of the HDMI-to-VGA chip is electrically connected to the VGA interface of the display screen. The video splitting processing chip communicates with an MCU. This KVM switch with screen splitting solves the problem of complex internal wiring and inconvenient maintenance in existing switchers.

Description

Technical Field

[0001] This utility model relates to the field of computer technology, and in particular to a KVM switch with screen splitting. Background Technology

[0002] To achieve the function of displaying multiple computer screens on a single monitor and allowing for individual switching and control, a method has emerged in the market, such as the utility model patent "A KVM Switch with Screen Splitting for Multiple Computers" with application number 201621385752.5. This method first uses a screen splitting processing chip to divide the screens of multiple computers, and then uses a mouse and keyboard to control multiple computers through a KVM switching chip to achieve the purpose of screen splitting and KVM switching for multiple computers. However, this requires the screen splitting processing chip and the KVM switching chip to be prepared in advance, and both chips need to be connected to the computer via cables, resulting in complex internal wiring of the switch and inconvenience for maintenance. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, this invention provides a KVM switch with screen splitting to solve the above-mentioned problems.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a KVM switch with screen splitting, including a mouse interface, a keyboard interface, a computer VGA and PS2 interface, a display VGA interface, a VGA to HDMI chip, an HDMI to VGA chip, a video splitting processing chip, and an MCU.

[0005] The mouse and keyboard interfaces are electrically connected to the computer's VGA and PS2 interfaces, and each of the computer's VGA and PS2 interfaces corresponds to a computer host. The VGA to HDMI chip corresponds to each of the computer's VGA and PS2 interfaces, and the input terminal of the VGA to HDMI chip is electrically connected to the corresponding computer host through the computer's VGA and PS2 interfaces.

[0006] The output terminal of the VGA to HDMI chip is electrically connected to the input terminal of the video segmentation processing chip, the output terminal of the video segmentation processing chip is electrically connected to the input terminal of the HDMI to VGA chip, and the output terminal of the HDMI to VGA chip is electrically connected to the VGA interface of the display screen; the video segmentation processing chip is communicatively connected to the MCU.

[0007] Preferably, both the mouse interface and the keyboard interface are PS / 2 interfaces.

[0008] Optionally, it also includes a keyboard / mouse-side PS2 microcontroller and a computer-side PS2 microcontroller. The signal input terminals of the keyboard / mouse-side PS2 microcontroller are electrically connected to the mouse interface and keyboard interface, respectively. The computer-side PS2 microcontroller corresponds one-to-one with the computer VGA and PS2 interfaces. The signal output terminals of the computer-side PS2 microcontroller are electrically connected to the corresponding computer VGA and PS2 interfaces. The signal output terminals of the keyboard / mouse-side PS2 microcontroller are electrically connected to the signal input terminals of the corresponding computer-side PS2 microcontrollers for each computer VGA and PS2 interface via an RS485 communication bus.

[0009] The computer control mode switching trigger output port of the MCU is electrically connected to the computer control mode switching trigger input port of the PS2 microcontroller on the keyboard and mouse side, so that the mouse connected to the mouse interface and the keyboard connected to the keyboard interface can switch between single computer control and synchronous control by all computers.

[0010] Specifically, the MCU is provided with a cascading port group to enable communication between different KVM switches through the cascading port group.

[0011] Preferably, the VGA to HDMI chip is model MS9288C.

[0012] Preferably, the HDMI to VGA chip is model MS9292.

[0013] The beneficial effects of this invention are as follows: In the KVM switch with screen splitting, the VGA-to-HDMI chip converts the VGA signal from the computer host into an HDMI signal, which is then input to the video splitting processing chip. The video splitting processing chip is used to split the screen display. The HDMI-to-VGA chip converts the HDMI signal output by the video splitting processing chip into a VGA signal, which is then output to the display through the display's VGA interface. The mouse interface is used to connect a mouse, and then the mouse's input signal is input to the computer host through the computer's VGA and PS / 2 interfaces to control the computer host. The keyboard interface is used to connect a keyboard, and then the keyboard's input signal is input to the computer host through the computer's VGA and PS / 2 interfaces to control the computer host. Compared with existing KVM switches, the KVM switch with screen splitting eliminates the KVM switching chip, and only requires the video splitting processing chip to be connected to the computer host via the VGA-to-HDMI chip to achieve the purpose of controlling multiple computers, thereby optimizing the wiring. Attached Figure Description

[0014] Figure 1 This is a system block diagram of a KVM switch with screen splitting in one embodiment of the present invention;

[0015] Figure 2This is a peripheral circuit diagram of the microcontroller on the keyboard and mouse side of a KVM switch with screen splitting in one embodiment of the present invention.

[0016] Figure 3 This is a peripheral circuit diagram of a video segmentation processing chip in a KVM switch with screen segmentation in one embodiment of the present invention.

[0017] Figure 4 This is a peripheral circuit diagram of an MCU with a screen splitting KVM switch in one embodiment of the present invention;

[0018] Figure 5 This is a circuit diagram of a VGA to HDMI chip with a KVM switch and a computer-side microcontroller in one embodiment of the present invention.

[0019] Figure 6 This is a peripheral circuit diagram of an HDMI to VGA chip for a KVM switcher with screen splitting in one embodiment of the present invention.

[0020] Figure 7 This is a circuit diagram of the power supply module of a KVM switch with screen splitting in one embodiment of the present invention. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] like Figure 1-7 As shown, a KVM switch with video splitting includes a mouse interface, a keyboard interface, a computer VGA and PS2 interface, a display VGA interface, a VGA to HDMI chip, an HDMI to VGA chip, a video splitting processing chip, and an MCU.

[0023] The mouse and keyboard interfaces are electrically connected to the computer's VGA and PS / 2 interfaces, with each VGA and PS / 2 interface corresponding to a computer host. The VGA-to-HDMI chip also corresponds to each VGA and PS / 2 interface, and its input terminal is electrically connected to the corresponding computer host via the VGA and PS / 2 interfaces. The computer's VGA and PS / 2 interfaces are divided into VGA and PS / 2 ports. In this embodiment, both the VGA and PS / 2 ports are integrated into the computer's VGA and PS / 2 interface. The VGA port of the computer's VGA and PS / 2 interface is electrically connected to the input terminal of the VGA-to-HDMI chip, and the PS / 2 port of the computer's VGA and PS / 2 interface is electrically connected to the mouse and keyboard interfaces.

[0024] The output terminal of the VGA to HDMI chip is electrically connected to the input terminal of the video segmentation processing chip, the output terminal of the video segmentation processing chip is electrically connected to the input terminal of the HDMI to VGA chip, and the output terminal of the HDMI to VGA chip is electrically connected to the VGA interface of the display screen; the video segmentation processing chip is communicatively connected to the MCU.

[0025] In the KVM switch with screen splitting, the VGA-to-HDMI chip converts the computer's VGA signal into an HDMI signal, which is then input to the video splitting processing chip. The video splitting processing chip is used to split the screen display. The HDMI-to-VGA chip converts the HDMI signal output from the video splitting processing chip into a VGA signal, which is then output to the display via the display's VGA interface. The mouse interface connects to a mouse, and the mouse's input signals are input to the computer host via the computer's VGA and PS / 2 interfaces to control the computer host. The keyboard interface connects to a keyboard, and the keyboard's input signals are input to the computer host via the computer's VGA and PS / 2 interfaces to control the computer host. Compared to existing KVM switches, this KVM switch with screen splitting eliminates the need for a separate KVM switch chip. Furthermore, by simply connecting the video splitting processing chip to the computer host via the VGA-to-HDMI chip, multiple computers can be controlled, thus optimizing wiring.

[0026] like Figure 3 and 4 As shown, in this embodiment, ports 97 and 98 of the video segmentation processing chip are electrically connected to ports 16 and 15 of the MCU to achieve communication, thereby configuring the video segmentation processing chip through the MCU.

[0027] It is worth noting that, such as Figure 2As shown, both the mouse interface and the keyboard interface are PS / 2 interfaces. The PS / 2 interface is an interface on PC-compatible computer systems that can be used to connect a keyboard and mouse.

[0028] Preferably, it also includes a keyboard / mouse-side PS2 microcontroller and a computer-side PS2 microcontroller. The signal input terminals of the keyboard / mouse-side PS2 microcontroller are electrically connected to the mouse interface and the keyboard interface, respectively. The computer-side PS2 microcontroller corresponds one-to-one with the computer's VGA and PS2 interfaces. The signal output terminals of the computer-side PS2 microcontroller are electrically connected to the corresponding computer's VGA and PS2 interfaces. Specifically, the signal output terminals of the computer-side PS2 microcontrollers are electrically connected to the PS2 ports of the corresponding computer's VGA and PS2 interfaces. The signal output terminals of the keyboard / mouse-side PS2 microcontrollers are electrically connected to the signal input terminals of the corresponding computer-side PS2 microcontrollers for each computer's VGA and PS2 interfaces via an RS485 communication bus.

[0029] The computer control mode switching trigger output port of the MCU is electrically connected to the computer control mode switching trigger input port of the PS2 microcontroller on the keyboard and mouse side, so that the mouse connected to the mouse interface and the keyboard connected to the keyboard interface can switch between single computer control and synchronous control by all computers.

[0030] The specific principle is as follows: When the MCU's computer control mode switching trigger output port outputs a high level to the keyboard and mouse side PS2 microcontroller's computer control mode switching trigger input port, the keyboard and mouse side PS2 microcontroller's built-in single-computer control mode will be triggered. At this time, the mouse and keyboard can control the selected computer through the keyboard and mouse side PS2 microcontroller, the RS485 communication bus, and the computer side PS2 microcontroller. When the MCU's computer control mode switching trigger output port outputs a low level to the keyboard and mouse side PS2 microcontroller's computer control mode switching trigger input port, the keyboard and mouse side PS2 microcontroller's built-in all-computer synchronous control mode will be triggered. At this time, the mouse and keyboard can control all computers through the keyboard and mouse side PS2 microcontroller, the RS485 communication bus, and the computer side PS2 microcontroller.

[0031] like Figure 2 As shown, in this embodiment, the mouse interface is electrically connected to ports 6 and 7 of the PS2 microcontroller on the mouse and keyboard side, the keyboard interface is electrically connected to ports 4 and 5 of the PS2 microcontroller on the mouse and keyboard side, and ports 14, 16, and 17 of the PS2 microcontroller on the mouse and keyboard side are electrically connected to ports 4, 2, and 1 of the RS485 chip closest to the PS2 microcontroller on the mouse and keyboard side in the RS485 communication bus, respectively. Figure 2 and 4As shown, port 2 and port 3 of the PS2 microcontroller on the keyboard and mouse side form a computer control mode switching trigger input port, which is electrically connected to the computer control mode switching trigger output port (port 64 and port 63) of the MCU to enable communication between the MCU and the PS2 microcontroller on the keyboard and mouse side.

[0032] like Figure 5 As shown, ports 14, 16, and 17 of the computer-side PS2 microcontroller are electrically connected to ports 4, 2, and 1 of the RS485 chip near the computer-side PS2 microcontroller in the RS485 communication bus, respectively. Ports 4 to 7 of the computer-side PS2 microcontroller are electrically connected to ports 2 to 5 of the computer's VGA and PS2 interfaces, respectively.

[0033] Optionally, the MCU is provided with a cascading port group to enable communication between different KVM switches. In this embodiment, the cascading port group is... Figure 2 Port groups P15 and P16, by setting up two cascaded port groups, can simultaneously form a series structure with two other KVM switches to achieve communication connections. Specifically, ports 3 and 4 of port group P15 are electrically connected to the RS485 communication bus, and ports 3 and 4 of port group P16 are also electrically connected to the RS485 communication bus. Furthermore, ports 5 and 6 of port group P15 are connected in parallel with... Figure 7 The power supply module's VCC12V output is electrically connected. Ports 1 and 2 of port group P15 are connected in parallel and then grounded. Ports 1 and 2 of port group P16 are connected in parallel and then electrically connected to the power supply module's VCC12V output. Ports 5 and 6 of port group P16 are connected in parallel and then grounded. In use, simply connect the two ends of a cable to the cascaded port groups of different KVM switches to enable communication between them.

[0034] Preferably, the VGA to HDMI chip is model MS9288C, the video segmentation processing chip is model MS1826A, and the MCU is model STM32F103RCT6. Figure 5As shown, in this embodiment, ports 25, 27, 29, 31, and 32 of the VGA to HDMI chip are electrically connected as input terminals to ports 6, 7, 9, 10, and 11 of the computer's VGA and PS2 interfaces, respectively. Ports 9 to 16 of the VGA to HDMI chip are electrically connected as output terminals to the input terminals of the video separation processing chip. The input terminals of the video separation processing chip differ depending on the VGA to HDMI chip used. In this embodiment, there are four VGA to HDMI chips, therefore, the video separation processing chip has four input terminals: the first input terminal consists of ports 43 to 50, the second input terminal consists of ports 51 to 58, the third input terminal consists of ports 68 to 75, and the fourth input terminal consists of ports 76 to 83.

[0035] Specifically, the HDMI to VGA chip is model MS9292. Figure 6 As shown, in this embodiment, ports 25, 27, 29, 31, and 32 of the HDMI to VGA chip are electrically connected as output terminals to ports 2, 3, 5, 7, and 9 of the VGA interface of the display screen, respectively; ports 9, 10, 11, 12, 13, 14, 15, and 16 of the HDMI to VGA chip are electrically connected as input terminals to the output terminals (ports 33, 32, 31, 30, 29, 28, 27, and 26) of the video separation processing chip, respectively.

[0036] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A KVM switch with picture partitioning, characterized by: This includes mouse interfaces, keyboard interfaces, computer VGA and PS / 2 interfaces, display VGA interfaces, VGA to HDMI chips, HDMI to VGA chips, video segmentation processing chips, and MCUs; The mouse and keyboard interfaces are electrically connected to the computer's VGA and PS2 interfaces, and each of the computer's VGA and PS2 interfaces corresponds to a computer host. The VGA to HDMI chip corresponds to each of the computer's VGA and PS2 interfaces, and the input terminal of the VGA to HDMI chip is electrically connected to the corresponding computer host through the computer's VGA and PS2 interfaces. The output terminal of the VGA to HDMI chip is electrically connected to the input terminal of the video segmentation processing chip, the output terminal of the video segmentation processing chip is electrically connected to the input terminal of the HDMI to VGA chip, and the output terminal of the HDMI to VGA chip is electrically connected to the VGA interface of the display screen; the video segmentation processing chip is communicatively connected to the MCU.

2. The KVM switch with picture-in-picture according to claim 1, wherein: Both the mouse interface and the keyboard interface are PS / 2 interfaces.

3. The KVM switch with picture-in-picture according to claim 2, wherein: It also includes a keyboard and mouse-side PS2 microcontroller and a computer-side PS2 microcontroller. The signal input terminals of the keyboard and mouse-side PS2 microcontroller are electrically connected to the mouse interface and keyboard interface, respectively. The computer-side PS2 microcontroller corresponds one-to-one with the computer VGA and PS2 interfaces. The signal output terminals of the computer-side PS2 microcontroller are electrically connected to the corresponding computer VGA and PS2 interfaces. The signal output terminals of the keyboard and mouse-side PS2 microcontroller are electrically connected to the signal input terminals of the corresponding computer-side PS2 microcontrollers for each computer VGA and PS2 interface via an RS485 communication bus. The computer control mode switching trigger output port of the MCU is electrically connected to the computer control mode switching trigger input port of the PS2 microcontroller on the keyboard and mouse side, so that the mouse connected to the mouse interface and the keyboard connected to the keyboard interface can switch between single computer control and synchronous control by all computers.

4. A KVM switch with screen splitting according to claim 1, characterized in that: The MCU is equipped with a cascading port group to enable communication between different KVM switches.

5. A KVM switch with screen splitting according to claim 1, characterized in that: The VGA to HDMI chip is model MS9288C.

6. A KVM switch with screen splitting according to claim 1, characterized in that: The HDMI to VGA converter chip is model MS9292.

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