A VGA extension module

Abstract

The utility model discloses a kind of VGA extension module, it is related to VGA extension technical field, the module includes signal input circuit, for input analog signal, and analog signal includes three primary color signals and line field signal;Protection circuit is used to protect the input end and output end of analog signal;Three primary color signal extension circuit is used to extend the three primary color signal of input;Line field signal extension circuit is used to extend the line field signal of input;Signal output circuit is used to output the three primary color signal and line field signal after expansion.The utility model respectively expands line, field synchronous signal in analog signal and red, green, blue three color signals, to realize the function of one input two outputs of analog signal, and the input end and output end of analog signal are overcurrent protected by protection circuit, prevent external large current from causing damage to device.

Description

Technical Field

[0001] This utility model relates to the field of VGA expansion technology, and more specifically, to a VGA expansion module. Background Technology

[0002] VGA (Video Graphics Array) is an image output standard that uses analog signal transmission. It is primarily used to transmit computer image signals to a monitor. Its signal consists of three color channels: red (R), green (G), and blue (B), as well as horizontal and vertical sync signals. Each channel expresses color brightness through different voltage levels, thus achieving complete image display. With users' increasing demands for image visualization effects and parallel information display, displaying the same content simultaneously on multiple screens has become a common application scenario.

[0003] However, existing motherboards only provide one VGA output. This single-channel output architecture has obvious limitations in practical applications. It not only cannot directly meet the requirements of multi-screen display, but also limits the flexibility and scalability of the system in different situations. This forces users to connect multiple screens by connecting an external graphics card or adding signal conversion devices, which not only increases the overall cost and complexity of the system, but also easily causes problems such as signal attenuation and synchronization loss.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes a VGA expansion module to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows:

[0007] A VGA expansion module includes a signal input circuit, a protection circuit, a three-primary-color signal expansion circuit, a horizontal and vertical signal expansion circuit, and a signal output circuit. The signal input circuit is electrically connected to the protection circuit, the three-primary-color signal expansion circuit, the horizontal and vertical signal expansion circuit, and the signal output circuit in sequence.

[0008] The signal input circuit is used to input analog signals, including three primary color signals and horizontal and vertical signals.

[0009] Protection circuits are used to protect the input and output terminals of analog signals.

[0010] The three-primary-color signal expansion circuit is used to expand the input three-primary-color signals;

[0011] Horizontal and vertical signal expansion circuits are used to expand the input horizontal and vertical signals;

[0012] The signal output circuit is used to output the extended three primary color signals and horizontal and vertical signals.

[0013] Furthermore, the signal input circuit includes an interface P1, with the first pin of interface P1 connected to 5V, the second pin of interface P1 grounded, the third and fifth pins of interface P1 connected to and grounded, and the fourth pin of interface P1 grounded.

[0014] Furthermore, the protection circuit includes several diodes, with the first pin of each diode grounded and the second pin of each diode connected to 5V.

[0015] Furthermore, the three-primary-color signal extension circuit includes chip U2, capacitor C9, capacitor C10, resistor R10, resistor R11, and resistor R12; the first pin of chip U2 is connected to one end of resistor R10, the other end of resistor R10 is grounded, the eighth pin of chip U2 is grounded, the fifteenth pin of chip U2 is connected to one end of resistor R11 and one end of resistor R12 respectively, the other end of resistor R11 is connected to 5V, the other end of resistor R12 is grounded, the sixteenth pin of chip U2 is connected to one end of capacitor C9 and one end of capacitor C10 respectively and is connected to 5V, the other end of capacitor C9 is connected to the other end of capacitor C10 and is grounded.

[0016] Furthermore, the three-primary-color signal extension circuit also includes chip U3, capacitors C11 and C12, resistors R13, R14, and R15; the first pin of chip U3 is connected to one end of resistor R13, the other end of resistor R13 is grounded, the eighth pin of chip U3 is grounded, the fifteenth pin of chip U3 is connected to one end of resistor R14 and one end of resistor R15 respectively, the other end of resistor R14 is connected to 5V, the other end of resistor R15 is grounded, the sixteenth pin of chip U3 is connected to one end of capacitor C11 and one end of capacitor C12 respectively and is connected to 5V, the other end of capacitor C11 and the other end of capacitor C12 are connected to grounded.

[0017] Furthermore, the horizontal and vertical signal extension circuit includes chip U1, resistors R1, R2, R3, R4, capacitors C5 and C6; the first pin of chip U1 is connected to one end of resistor R1, the other end of resistor R1 is connected to one end of resistor R3 and connected to H_IN, the other end of resistor R3 is connected to one end of resistor R4, the other end of resistor R4 is connected to one end of resistor R2 and connected to V_IN, the other end of resistor R2 is connected to the ninth pin of chip U1, the second pin of chip U1 is connected to the third and fifth pins respectively, the seventh pin of chip U1 is grounded, the eighth pin of chip U1 is connected to the eleventh and twelfth pins respectively, the fourteenth pin of chip U1 is connected to one end of capacitor C5 and one end of capacitor C6 and connected to 5V, and the other end of capacitor C5 is connected to the other end of capacitor C6 and grounded.

[0018] Furthermore, the signal output circuit includes interface P2. The first pin of interface P2 is connected to 5V, the third pin of interface P2 is grounded, the fifth pin of interface P2 is connected to the seventh and ninth pins and grounded, the fourth pin of interface P2 is grounded, and the sixth pin of interface P2 is connected to the eighth and tenth pins and grounded.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention expands the horizontal and vertical synchronization signals and the red, green, and blue color signals in the analog signal through a three-primary-color signal expansion circuit and a horizontal and vertical signal expansion circuit, respectively, thereby realizing the one-input-two-output function of the analog signal. The module is small in size and easy to fix and install. It also provides overcurrent protection for the input and output terminals of the analog signal through a protection circuit to prevent damage to the device by external high current, thereby effectively improving the safety and stability of the circuit. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic block diagram of a VGA expansion module according to an embodiment of the present utility model;

[0023] Figure 2 This is a circuit diagram of the signal input circuit in a VGA expansion module according to an embodiment of the present utility model;

[0024] Figure 3This is one of the circuit diagrams of a protection circuit in a VGA expansion module according to an embodiment of the present utility model;

[0025] Figure 4 This is a second circuit diagram of a protection circuit in a VGA expansion module according to an embodiment of the present utility model;

[0026] Figure 5 This is the third circuit diagram of the protection circuit in a VGA expansion module according to an embodiment of the present utility model;

[0027] Figure 6 This is one of the circuit diagrams of a three-primary-color signal expansion circuit in a VGA expansion module according to an embodiment of the present utility model;

[0028] Figure 7 This is a second circuit diagram of a three-primary-color signal expansion circuit in a VGA expansion module according to an embodiment of the present utility model;

[0029] Figure 8 This is a circuit diagram of a horizontal and vertical signal expansion circuit in a VGA expansion module according to an embodiment of the present invention;

[0030] Figure 9 This is a circuit diagram of the signal output circuit in a VGA expansion module according to an embodiment of the present invention.

[0031] In the picture:

[0032] 1. Signal input circuit; 2. Protection circuit; 3. Three primary color signal extension circuit; 4. Horizontal and vertical signal extension circuit; 5. Signal output circuit. Detailed Implementation

[0033] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention.

[0034] According to an embodiment of the present invention, a VGA expansion module is provided.

[0035] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1 As shown, according to an embodiment of the present invention, the VGA expansion module includes a signal input circuit 1, a protection circuit 2, a three-primary-color signal expansion circuit 3, a horizontal and vertical signal expansion circuit 4, and a signal output circuit 5. The signal input circuit 1 is electrically connected to the protection circuit 2, the three-primary-color signal expansion circuit 3, the horizontal and vertical signal expansion circuit 4, and the signal output circuit 5 in sequence.

[0036] The circuit includes a signal input circuit 1 for inputting analog signals, which include three primary color signals and horizontal and vertical signals; a protection circuit 2 for protecting the input and output terminals of the analog signals; a three primary color signal expansion circuit 3 for expanding the input three primary color signals; a horizontal and vertical signal expansion circuit 4 for expanding the input horizontal and vertical signals; and a signal output circuit 5 for outputting the expanded three primary color signals and horizontal and vertical signals.

[0037] Among them, such as Figure 2 As shown, the signal input circuit 1 includes an interface P1, with the first pin of the interface P1 connected to 5V, the second pin of the interface P1 grounded, the third and fifth pins of the interface P1 connected to and grounded, and the fourth pin of the interface P1 grounded.

[0038] Specifically, VGA signals are analog signals, mainly composed of three color signals: red (R), green (G), and blue (B), as well as horizontal (H) and vertical (V) signals.

[0039] The protection circuit 2 includes several diodes, with the first pin of each diode grounded and the second pin of each diode connected to 5V.

[0040] Specifically, such as Figures 3-5 As shown, protection circuit 2 includes diodes D1 to D19 (the diodes are BAT54S diodes). In order to protect the circuit from damage by external high current, BAT54S diodes are used for protection at the input and output terminals of analog signals.

[0041] Among them, such as Figure 6 As shown, the three-primary-color signal extension circuit 3 includes chip U2, capacitor C9, capacitor C10, resistor R10, resistor R11, and resistor R12; the first pin of chip U2 is connected to one end of resistor R10, the other end of resistor R10 is grounded, the eighth pin of chip U2 is grounded, the fifteenth pin of chip U2 is connected to one end of resistor R11 and one end of resistor R12 respectively, the other end of resistor R11 is connected to 5V, the other end of resistor R12 is grounded, the sixteenth pin of chip U2 is connected to one end of capacitor C9 and one end of capacitor C10 respectively and is connected to 5V, the other end of capacitor C9 is connected to the other end of capacitor C10 and is grounded.

[0042] Among them, such as Figure 7As shown, the three-primary-color signal extension circuit 3 also includes chip U3, capacitor C11, capacitor C12, resistor R13, resistor R14, and resistor R15; the first pin of chip U3 is connected to one end of resistor R13, the other end of resistor R13 is grounded, the eighth pin of chip U3 is grounded, the fifteenth pin of chip U3 is connected to one end of resistor R14 and one end of resistor R15 respectively, the other end of resistor R14 is connected to 5V, the other end of resistor R15 is grounded, the sixteenth pin of chip U3 is connected to one end of capacitor C11 and one end of capacitor C12 respectively and is connected to 5V, the other end of capacitor C11 is connected to the other end of capacitor C12 and is grounded.

[0043] Among them, such as Figure 8 As shown, the horizontal and vertical signal extension circuit 4 includes chip U1, resistors R1, R2, R3, and R4, capacitors C5 and C6; the first pin of chip U1 is connected to one end of resistor R1, the other end of resistor R1 is connected to one end of resistor R3 and connected to H_IN, the other end of resistor R3 is connected to one end of resistor R4, the other end of resistor R4 is connected to one end of resistor R2 and connected to V_IN, the other end of resistor R2 is connected to the ninth pin of chip U1, the second pin of chip U1 is connected to the third and fifth pins respectively, the seventh pin of chip U1 is grounded, the eighth pin of chip U1 is connected to the eleventh and twelfth pins respectively, the fourteenth pin of chip U1 is connected to one end of capacitor C5 and one end of capacitor C6 and connected to 5V, and the other end of capacitor C5 is connected to the other end of capacitor C6 and grounded.

[0044] Specifically, both chip U2 and chip U3 are CH440G chips, which expand the input R, G, and B signals to achieve a one-input-two-output function; chip U1 is a 74HC04D chip, which expands the input H and V signals to achieve a one-input-two-output function.

[0045] Among them, such as Figure 9 As shown, the signal output circuit 5 includes an interface P2. The first pin of the interface P2 is connected to 5V, the third pin of the interface P2 is grounded, the fifth pin of the interface P2 is connected to the seventh and ninth pins and grounded, the fourth pin of the interface P2 is grounded, and the sixth pin of the interface P2 is connected to the eighth and tenth pins and grounded.

[0046] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0047] In practical applications, the analog signal is first introduced into the protection circuit 2 through the signal input circuit 1. The protected signal is then introduced into the three primary color signal expansion circuit 3 and the horizontal and vertical signal expansion circuit 4, respectively. The three primary color signal expansion circuit 3 and the horizontal and vertical signal expansion circuit 4 expand the horizontal and vertical synchronization signals and the red, green and blue color signals in the analog signal, thereby realizing the one-input-two-output function of the analog signal. The expanded signal is then output through the signal output circuit 5.

[0048] In summary, by means of the above-mentioned technical solution of this utility model, this utility model expands the horizontal and vertical synchronization signals and the red, green and blue color signals in the analog signal through the three primary color signal expansion circuit 3 and the horizontal and vertical signal expansion circuit 4 respectively, thereby realizing the one-input and two-output function of the analog signal. The module is small in size and easy to fix and install. The protection circuit 2 provides overcurrent protection for the input and output terminals of the analog signal to prevent damage to the device by external large current, thereby effectively improving the safety and stability of the circuit.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., 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 VGA expansion module, characterized in that, This module includes a signal input circuit, a protection circuit, a three-primary-color signal expansion circuit, a horizontal and vertical signal expansion circuit, and a signal output circuit. The signal input circuit is electrically connected in sequence to the protection circuit, the three-primary-color signal expansion circuit, the horizontal and vertical signal expansion circuit, and the signal output circuit. The signal input circuit is used to input analog signals, and the analog signals include three primary color signals and horizontal and vertical signals. The protection circuit is used to protect the input and output terminals of the analog signal. The three primary color signal expansion circuit is used to expand the input three primary color signals; The horizontal and vertical signal expansion circuit is used to expand the input horizontal and vertical signals; The signal output circuit is used to output the extended three primary color signals and horizontal and vertical signals; The three-primary-color signal expansion circuit includes chip U2, capacitor C9, capacitor C10, resistor R10, resistor R11, and resistor R12. Specifically, the first pin of chip U2 is connected to one end of resistor R10, the other end of resistor R10 is grounded, the eighth pin of chip U2 is grounded, the fifteenth pin of chip U2 is connected to one end of resistor R11 and one end of resistor R12, the other end of resistor R11 is connected to 5V, the other end of resistor R12 is grounded, the sixteenth pin of chip U2 is connected to one end of capacitor C9 and one end of capacitor C10 and is connected to 5V, the other end of capacitor C9 is connected to the other end of capacitor C10 and is grounded.

2. A VGA expansion module according to claim 1, characterized in that, The signal input circuit includes an interface P1, with the first pin of the interface P1 connected to 5V, the second pin of the interface P1 grounded, the third and fifth pins of the interface P1 connected to and grounded, and the fourth pin of the interface P1 grounded.

3. A VGA expansion module according to claim 2, characterized in that, The protection circuit includes several diodes, with the first pin of each diode grounded and the second pin of each diode connected to 5V.

4. A VGA expansion module according to claim 3, characterized in that, The three-primary-color signal expansion circuit also includes chip U3, capacitor C11, capacitor C12, resistor R13, resistor R14, and resistor R15; Specifically, the first pin of chip U3 is connected to one end of resistor R13, the other end of resistor R13 is grounded, the eighth pin of chip U3 is grounded, the fifteenth pin of chip U3 is connected to one end of resistor R14 and one end of resistor R15, the other end of resistor R14 is connected to 5V, the other end of resistor R15 is grounded, the sixteenth pin of chip U3 is connected to one end of capacitor C11 and one end of capacitor C12 and is connected to 5V, the other end of capacitor C11 and the other end of capacitor C12 are connected to grounded.

5. A VGA expansion module according to claim 4, characterized in that, The horizontal and vertical signal expansion circuit includes chip U1, resistors R1, R2, R3, R4, capacitor C5, and capacitor C6. The first pin of chip U1 is connected to one end of resistor R1. The other end of resistor R1 is connected to one end of resistor R3 and connected to H_IN. The other end of resistor R3 is connected to one end of resistor R4. The other end of resistor R4 is connected to one end of resistor R2 and connected to V_IN. The other end of resistor R2 is connected to the ninth pin of chip U1. The second pin of chip U1 is connected to the third and fifth pins respectively. The seventh pin of chip U1 is grounded. The eighth pin of chip U1 is connected to the eleventh and twelfth pins respectively. The fourteenth pin of chip U1 is connected to one end of capacitor C5 and one end of capacitor C6 and connected to 5V respectively. The other end of capacitor C5 is connected to the other end of capacitor C6 and grounded.

6. A VGA expansion module according to claim 5, characterized in that, The signal output circuit includes an interface P2. The first pin of the interface P2 is connected to 5V, the third pin of the interface P2 is grounded, the fifth pin of the interface P2 is connected to the seventh and ninth pins and grounded, the fourth pin of the interface P2 is grounded, and the sixth pin of the interface P2 is connected to the eighth and tenth pins and grounded.

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