Automatic detection circuit of multi-channel video source

Abstract

The utility model discloses an automatic detection circuit for multiple video sources, and relates to the technical field of electronic circuits, in particular to an automatic detection circuit for multiple video sources, which comprises a main control chip and a plurality of video source detection units, the video source detection unit comprises an access module, a pre-detection module and an in-place detection module which are respectively connected with the main control chip; the pre-detection module comprises a first MOS tube, and the in-place detection circuit comprises a second MOS tube; the access module comprises an access port and a power supply port, the access port is used for accessing a video source, and when the power supply port is switched on, high level is provided for a grid electrode of the first MOS tube, so that the first MOS tube is switched on, and the high level is output to the main control chip at a source electrode; after the main control chip obtains the high level output by the source electrode of the first MOS transistor, the high level is output to the grid electrode of the second MOS transistor, so that the second MOS transistor is conducted, and the high level is output to the video source at the source electrode, in-place detection of the video source is achieved, and the device can conduct corresponding adjustment and processing according to the detection result so as to achieve more intelligent and interactive functions.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to an automatic detection circuit for multiple video sources. Background Art

[0002] With the continuous development and advancement of technology, video plays an increasingly important role in our lives.

[0003] Traditional video source access mainly involves the input and connection of video signals to ensure that the video signals can be correctly transmitted and displayed. The existing video source access technology has the following disadvantages: 1. Inaccurate position; 2. Tedious manual adjustment; 3. Inability to adapt to multi-screen requirements; 4. Inability to achieve video tracking; 5. Lack of interactivity. Utility Model Content

[0004] The purpose of the utility model is to avoid the shortcomings of the prior art and provide a technology that can realize automatic detection and switching of video sources.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] An automatic detection circuit for multiple video sources comprises: a main control chip and a plurality of video source detection units; the video source detection unit comprises an access module, a pre-detection module and an in-situ detection module, which are respectively connected to the main control chip; the pre-detection module comprises a first MOS tube, and the in-situ detection circuit comprises a second MOS tube; the access module comprises an access port and a power supply port, the access port is used to access the video source, and when the power supply port is connected, a high level is provided for the gate of the first MOS tube, so that the first MOS tube is turned on, and a high level is output at the source to the main control chip; after the main control chip obtains the high level output from the source of the first MOS tube, a high level is output to the gate of the second MOS tube, so that the second MOS tube is turned on, and a high level is output at the source to the video source.

[0007] Specifically, the access module is provided with a first anti-static isolation device, and the anti-static isolation device is arranged on the circuit between the video source and the second MOS tube.

[0008] More specifically, a first triode is provided between the power supply port and the first MOS tube; the power supply port is connected to the base of the first triode; and the source of the first triode is connected to the gate of the first MOS tube.

[0009] More specifically, a second triode is provided between the main control chip and the second MOS tube; the main control chip is connected to the base of the second triode; and the source of the second triode is connected to the gate of the second MOS tube.

[0010] In another specific embodiment, the emitter of the first transistor is grounded, the base is connected to a first resistor and connected to the power supply port through the first resistor, and the source is connected to a second resistor and connected to the gate of the first MOS transistor through the second resistor.

[0011] More specifically, the drain of the first MOS tube is connected to the gate of the first MOS tube through a first filtering unit; the first filtering unit includes a first capacitor and a third resistor connected in parallel.

[0012] In another specific embodiment, the emitter of the second transistor is grounded, the base is connected to a fourth resistor, and is connected to the main control chip through the fourth resistor, and the source is connected to a fifth resistor, and is connected to the gate of the second MOS tube through the fifth resistor.

[0013] More specifically, the drain of the second MOS tube is connected to the gate of the second MOS tube through a second filtering unit; the second filtering unit includes a second capacitor and a sixth resistor connected in parallel.

[0014] The above also includes: an output module; the input end of the output module is used to connect with the main control chip, and the output end is used to connect with the output device.

[0015] More specifically, the output end of the output module is also provided with a second anti-static isolation device.

[0016] The beneficial effects achieved by the utility model are as follows: an automatic detection circuit for multiple video sources, comprising: a main control chip and a plurality of video source detection units; the video source detection unit comprises an access module, a pre-detection module and an in-situ detection module, which are respectively connected to the main control chip; the pre-detection module comprises a first MOS tube, and the in-situ detection circuit comprises a second MOS tube; the access module comprises an access port and a power supply port, the access port is used to access the video source, and when the power supply port is connected, a high level is provided to the gate of the first MOS tube, so that the first MOS tube is turned on, and a high level is output at the source to the main control chip; after the main control chip obtains the high level output from the source of the first MOS tube, a high level is output to the gate of the second MOS tube, so that the second MOS tube is turned on, and a high level is output at the source to the video source, so as to realize the in-situ detection of the video source, so that the device can make corresponding adjustments and processing according to the detection results, so as to realize more intelligent and interactive functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1It is a schematic block diagram of the electrical principle of an automatic detection circuit for multiple video sources according to an embodiment of the present application;

[0019] Figure 2 It is a schematic diagram of the circuit principle of an access module of an automatic detection circuit for multiple video sources according to an embodiment of the present application;

[0020] Figure 3 It is a schematic diagram of the circuit principle of a pre-detection module of an automatic detection circuit for multiple video sources according to an embodiment of the present application;

[0021] Figure 4 It is a schematic diagram of the circuit principle of a presence detection module of an automatic detection circuit for multiple video sources according to an embodiment of the present application;

[0022] Figure 5 It is a schematic diagram of the circuit principle of an output module of an automatic detection circuit for multiple video sources in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described through the implementation method with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0024] Example 1

[0025] The present invention provides an automatic detection circuit for multiple video sources, such as Figures 1 to 5 As shown, it includes: a video source detection unit, a main control chip and an output module; wherein, the video source detection unit is provided with several units, which are respectively used to access different video sources.

[0026] The video source detection unit includes an access module, a pre-detection module and an in-situ detection module, which are respectively connected to the main control chip. Among them, the pre-detection module includes a first MOS tube Q4, and the in-situ detection circuit includes the first MOS tube Q4.

[0027] The access module includes an access port and a power supply port (RX0_5V_IN), and the access port is used to access a video source.

[0028] The main control chip detects whether the external HDMI 5V power supply is connected to the chip through the RX0_PWR5V port in the access module; when the access port is not connected to the video source, the external HDMI RX0_5V_IN (5V voltage) is not available when not inserted, and the first MOS tube Q4 cannot be turned on. The chip RX0_PWR5V cannot detect the external 5V and will not send a high level to the first MOS tube Q4.

[0029] When the access port is connected to the video source, the power supply port is turned on at the same time. At this time, the power supply port provides a high level for the gate of the first MOS tube Q4, so that the first MOS tube Q4 is turned on, and the high level is output to the main control chip at the source; after the main control chip obtains the high level output from the source of the first MOS tube Q4, it outputs the high level of the first MOS tube Q4 to the gate of the second MOS tube Q7, so that the second MOS tube Q7 is turned on, and the high level is output to the video source at the source; that is, the external video source device receives the high level signal through RX0_HPD, and after receiving the high level, the video source device sends data to the video processing chip Si l9575, so that the device connected to the external HDMI recognizes that the HDMI has been inserted, and then transmits data through RX4 groups of differential pairs and a group of I2C.

[0030] Specifically, the access module is provided with a first anti-static isolation device, which is arranged on the circuit between the video source and the second MOS tube to prevent the influence of static electricity generated during hot plugging.

[0031] More specifically, a first triode Q6 is provided between the power supply port and the first MOS tube Q4; the power supply port is connected to the base of the first triode Q6; the source of the first triode Q6 is connected to the gate of the first MOS tube Q4. A second triode Q8 is provided between the main control chip and the second MOS tube Q7; the main control chip is connected to the base of the second triode Q8; the source of the second triode Q8 is connected to the gate of the second MOS tube Q7.

[0032] More specifically, the emitter of the first triode Q6 is grounded, the base is connected to the first resistor R244, and is connected to the power supply port through the first resistor R244, the source is connected to the second resistor R243, and is connected to the gate of the first MOS tube Q4 through the second resistor R243. The drain of the first MOS tube Q4 is connected to the gate of the first MOS tube Q4 through the first filtering unit; the first filtering unit includes a first capacitor C22 and a third resistor R242 connected in parallel.

[0033] The emitter of the second triode Q8 is grounded, the base is connected to the fourth resistor R162, and is connected to the main control chip through the fourth resistor R162, the source is connected to the fifth resistor R161, and is connected to the gate of the second MOS tube Q7 through the fifth resistor R161. The drain of the second MOS tube Q7 is connected to the gate of the second MOS tube Q7 through the second filtering unit; the second filtering unit includes a second capacitor C23 and a sixth resistor R154 connected in parallel.

[0034] When the access port is connected to the video source, the RX0_5V_IN pin inputs a high level. At this time, the first transistor Q6 is turned on, and the gate-source voltage of the upper first MOS tube Q4 is greater than the field effect tube turn-on voltage through the second resistor R243, so that the field effect tube is turned on and the drain and source are turned on, so that the RX0_PWR5V pin is a high level.

[0035] After the main control chip obtains the high level of the RX0_PWR5V pin, it outputs a high level signal to the second transistor Q8 through the HT0_CTLb pin. At this time, the second transistor Q8 is turned on, and the gate-source voltage of the second MOS transistor Q7 above is greater than the field effect transistor turn-on voltage through the fifth resistor R161, so that the field effect transistor is turned on and the drain and source are turned on, so that the RX0_HPD pin is at a high level. Because static electricity is easily generated when hot plugging HDMI, RX0_HPD needs to be connected to the HTPLUG hot plug detection pin of HDMI through the first anti-static isolation device. The high level of the RX0_HPD pin is sent to the device that sends the signal source through the HTPLUG insertion detection port of HDMI. RX0_HPD allows the video source device to receive a high level signal. After receiving the high level, the video source input device sends data to the video main control chip, so that the video source device recognizes that it has been inserted into HDMI and then transmits data through RX4 differential pairs and a group of I2C transmission.

[0036] More specifically, it also includes: an output module; the input end of the output module is used to connect to the main control chip, and the output end is used to connect to the output device. The output end of the output module is also provided with a second anti-static isolation device.

[0037] Connect to the video source output end. The video source output end pulls up the CH0_Tx_HPD2 pin, which makes the CH0_Tx_HPD pin of the hole chip high. The main control chip sends data to the output module for video output.

[0038] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An automatic detection circuit for multiple video sources, characterized in that: include: Main control chip and several video source detection units; The video source detection unit includes an access module, a pre-detection module and an in-situ detection module, which are respectively connected to the main control chip; The pre-detection module includes a first MOS tube, and the in-situ detection module includes a second MOS tube; The access module includes an access port and a power supply port, wherein the access port is used to access a video source, and when the power supply port is turned on, it provides a high level to the gate of the first MOS tube, so that the first MOS tube is turned on and outputs a high level at the source to the main control chip; After the main control chip obtains the high level output from the source of the first MOS tube, it outputs a high level to the gate of the second MOS tube, turns on the second MOS tube, and outputs a high level at the source to the video source.

2. The automatic detection circuit for multiple video sources according to claim 1, characterized in that: The access module is provided with a first anti-static isolation device, and the anti-static isolation device is arranged on the circuit between the video source and the second MOS tube.

3. The automatic detection circuit for multiple video sources according to claim 2, characterized in that: A first triode is further provided between the power supply port and the first MOS tube; The power supply port is connected to the base of the first transistor; the source of the first transistor is connected to the gate of the first MOS transistor.

4. The automatic detection circuit for multiple video sources according to claim 3, characterized in that: A second triode is further provided between the main control chip and the second MOS tube; The main control chip is connected to the base of the second transistor; the source of the second transistor is connected to the gate of the second MOS transistor.

5. The automatic detection circuit for multiple video sources according to claim 3, characterized in that: The emitter of the first transistor is grounded, the base is connected to a first resistor and connected to the power supply port through the first resistor, and the source is connected to a second resistor and connected to the gate of the first MOS transistor through the second resistor.

6. The automatic detection circuit for multiple video sources according to claim 5, characterized in that: The drain of the first MOS tube is connected to the gate of the first MOS tube through the first filtering unit; The first filtering unit includes a first capacitor and a third resistor connected in parallel.

7. The automatic detection circuit for multiple video sources according to claim 4, characterized in that: The emitter of the second transistor is grounded, the base is connected to a fourth resistor and connected to the main control chip through the fourth resistor, and the source is connected to a fifth resistor and connected to the gate of the second MOS transistor through the fifth resistor.

8. The automatic detection circuit for multiple video sources according to claim 7, characterized in that: The drain of the second MOS tube is connected to the gate of the second MOS tube through the second filtering unit; The second filtering unit includes a second capacitor and a sixth resistor connected in parallel.

9. An automatic detection circuit for multiple video sources according to any one of claims 1 to 8, characterized in that: Also includes: Output module; The input end of the output module is used to connect to the main control chip, and the output end is used to connect to an output device.

10. The automatic detection circuit for multiple video sources according to claim 9, characterized in that: The output end of the output module is also provided with a second anti-static isolation device.

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