Novel HDMI signal backup switching circuit and electronic equipment

Abstract

The utility model discloses a novel HDM I signal backup switching circuit and an electronic device, and the novel HDM I signal backup switching circuit comprises an HDM I input end, an HDM I output end, a first electronic switch module, a shunt module, a second electronic switch module, and a power taking module. The input end of the HDM I is respectively connected with the shunt module and the second electronic switch module through the first electronic switch module; the output end of the second electronic switch module is connected with the output end of the HDM I; the power taking module takes an HPD pin of the input end of the power taking HDM I to supply power to the first electronic switch module and the second electronic switch module. According to the novel HDM I signal backup switching circuit disclosed by the utility model, the purpose of realizing normal output of HDM I signals after the circuit is powered down is achieved, signal loss and interruption are avoided, and switching backup of an HDM I signal source during power down is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of HDMI signal backup, in particular to a novel HDMI signal backup switching circuit and electronic equipment. Background Art

[0002] HDMI video signal (hereinafter referred to as HDMI signal) is a high-speed TMDS signal, which is widely used in the field of video transmission. In order to back up the HDMI signal and avoid the loss of the HDMI signal, a signal backup circuit is usually set on the video processing device. However, most of the existing signal backup circuits are designed for non-power-off abnormal situations such as mechanical and loop failures of the equipment, and do not perform signal backup for power-off situations. Therefore, the existing signal backup circuit needs to be powered all the time to work properly. When the device circuit loses power, the backup circuit cannot work properly, resulting in signal interruption. Since the HDMI signal is a high-speed TMDS signal, it has high requirements for line impedance and interference. The use of physical switches such as relays is prone to impedance problems and cannot meet the needs of HDMI signal backup. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a novel HDMI signal backup switching circuit and electronic equipment, wherein the novel HDMI signal backup switching circuit comprises an HDMI input terminal, an HDMI output terminal, a first electronic switch module, a shunt module, a second electronic switch module and a power taking module, wherein:

[0004] The HDMI input terminal is connected to the splitter module and the second electronic switch module respectively through the first electronic switch module; the output terminal of the second electronic switch module is connected to the HDMI output terminal;

[0005] The power taking module takes power from the HPD pin of the HDMI input terminal to supply power to the first electronic switch module and the second electronic switch module.

[0006] Preferably, the HDMI output terminal includes a first HDMI output terminal and a second HDMI output terminal, wherein:

[0007] The HDMI input end is connected to the input end of the first electronic switch module; the output end of the first electronic switch module is respectively connected to the input end of the splitter module and the input end of the second electronic switch module; the output end of the splitter module is respectively connected to the input end of the second electronic switch module and the second output end of HDMI; the output end of the second electronic switch module is connected to the first output end of HDMI;

[0008] The input end of the power taking module is connected to the HPD pin of the HDMI input end; the output end of the power taking module supplies power to the first electronic switch module and the second electronic switch module.

[0009] Preferably, the power taking module includes a diode D31, a magnetic bead FB30, a capacitor C91, a capacitor C92, a capacitor C93, a capacitor C94, a resistor R1, a resistor R147 and a voltage regulator U10, wherein:

[0010] The anode of the diode D31 is connected to the HPD pin of the HDMI input terminal, and the cathode is connected to the input terminal of the voltage regulator U10 through the magnetic bead FB30; the output terminal of the voltage regulator U10 is respectively connected to the first electronic switch module and the second electronic switch module for power supply;

[0011] The connection node between the magnetic bead FB30 and the input end of the voltage regulator U10 is grounded through capacitors C91 and C92 respectively;

[0012] The connection node between the magnetic bead FB30 and the input end of the voltage regulator U10 is connected to the enable end of the voltage regulator U10 through the resistor R1; the connection node between the resistor R1 and the enable end of the voltage regulator U10 is grounded through the resistor R147;

[0013] The output end of the voltage regulator U10 is grounded through capacitors C93 and C94 respectively.

[0014] Preferably, the power consumption of the first electronic switch module and the second electronic switch module is 1 mW.

[0015] Preferably, the model of the first electronic switch module and the second electronic switch module is PI3WVR13412.

[0016] Preferably, the model of the shunt module is LT86102UXE.

[0017] Preferably, the model of the HDMI input terminal and the HDMI output terminal is HDMI_A_FEMAL_SMD.

[0018] Preferably, the HDMI input terminal and the HDMI output terminal are both provided with a protection module.

[0019] The utility model further provides an electronic device, which adopts any of the above-mentioned novel HDMI signal backup switching circuits.

[0020] The novel HDMI signal backup switching circuit provided by the utility model achieves the purpose of realizing normal output of HDMI signal even after power failure of the circuit through the circuit structure combining the first electronic switch module, the second electronic switch module, the power taking module, the shunt module, the HDMI input terminal 1A and the HDMI output terminal 1B, thereby avoiding signal loss and interruption, and realizing power failure switching backup of HDMI signal source. Moreover, the impedance of the electronic switch in the high-speed signal system is smaller than that of the physical switch such as the relay, thereby reducing the occurrence of impedance phenomenon, and realizing the demand for HDMI signal backup switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A block diagram of a novel HDMI signal backup switching circuit provided by the utility model;

[0022] Figure 2 This is a block diagram of a new HDMI signal backup switching circuit with two output backups;

[0023] Figure 3 This is the circuit diagram of the HDMI input terminal;

[0024] Figure 4 This is the circuit diagram of the first HDMI output terminal;

[0025] Figure 5 This is the circuit diagram of the second HDMI output terminal;

[0026] Figure 6 is a circuit diagram of a first electronic switch module;

[0027] Figure 7 This is the circuit diagram of the power taking module;

[0028] Figure 8 is a circuit diagram of a second electronic switch module;

[0029] Fig. 9 This is the circuit diagram of the shunt module;

[0030] Among them: 1A, HDMI input end; 1B, HDMI output end; 1B1, HDMI first output end; 1B2, HDMI second output end; 20, first electronic switch module; 30, diverter module; 40, second electronic switch module; 50, power supply module. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments. However, the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work all belong to the protection scope of the present invention. The experimental methods in the following embodiments are conventional methods unless otherwise specified. The materials, reagents, etc. used in the following embodiments are all commercially available unless otherwise specified.

[0032] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The utility model embodiment provides a novel HDMI signal backup switching circuit and electronic device, wherein the novel HDMI signal backup switching circuit comprises an HDMI input terminal 1A, an HDMI output terminal 1B, a first electronic switch module 20, a shunt module 30, a second electronic switch module 40 and a power taking module 50, wherein:

[0035] The HDMI input terminal 1A is connected to the splitter module 30 and the second electronic switch module 40 respectively through the first electronic switch module 20; the output terminal of the second electronic switch module 40 is connected to the HDMI output terminal 1B;

[0036] The power taking module 50 takes power from the HPD pin of the HDMI input terminal 1A to supply power to the first electronic switch module 20 and the second electronic switch module 40 .

[0037] When implementing it, Figure 1As shown, the novel HDMI signal backup switching circuit includes an HDMI input terminal 1A, an HDMI output terminal 1B, a first electronic switch module 20, a shunt module 30, a second electronic switch module 40 and a power supply module 50, wherein:

[0038] HDMI input terminal 1A is connected to HDMI signal; HDMI output terminal 1B is connected to backup equipment, such as backup video processor, etc.; the model of HDMI input terminal 1A and HDMI output terminal 1B is HDMI_A_FEMAL_SMD;

[0039] The HDMI input terminal 1A is connected to the input terminal of the first electronic switch module 20; the output terminal of the first electronic switch module 20 is divided into two paths, one path is connected to the input terminal of the splitter module 30, and the other path is connected to the input terminal of the second electronic switch module 40; the output terminal of the second electronic switch module 40 is connected to the HDMI output terminal 1B;

[0040] The input end of the power taking module 50 is connected to the HPD pin of the HDMI input terminal 1A to take power from the HDMI input terminal 1A; the output end of the power taking module 50 is connected to the first electronic switch module 20 and the second electronic switch module 40 to supply power to the first electronic switch module 20 and the second electronic switch module 40;

[0041] During normal operation, the HDMI signal is input from the HDMI input terminal 1A, enters the second electronic switch module 40 via the first electronic switch module 20 and the splitter module, and is output from the second electronic switch module 40 to the HDMI output terminal 1B;

[0042] The HPD pin on the HDMI line carries a 5V signal, which is used to detect whether the device is connected. HPD is a low-level valid signal. When the device is connected to the HDMI line, it will send a 5V pulse signal. When the circuit in this embodiment loses power, the power module 50 takes power from the HPD pin of the HDMI input terminal 1A and then supplies power to the first electronic switch module 20 and the second electronic switch module 40. The HDMI signal is output from the HDMI input terminal 1A and then output from the HDMI output terminal 1B via the first electronic switch 20 and the second electronic switch 40, so that the two electronic switch modules can also perform signal transmission backup when the power is off, avoiding the loss of the HDMI signal source when the power is off. At the same time, when the power is off, the electronic switch module 20 and the second electronic switch module 40 automatically switch the backup signal circuit, which improves the efficiency of abnormal backup switching in case of power failure, and can meet the use requirements of application scenarios with high timeliness requirements such as concerts.

[0043] The novel HDMI signal backup switching circuit provided by the utility model achieves the purpose of realizing normal output of HDMI signal even after power failure of the circuit through the circuit structure combining the first electronic switch module, the second electronic switch module, the power taking module, the shunt module, the HDMI input terminal 1A and the HDMI output terminal 1B, thereby avoiding signal loss and interruption, and realizing power failure switching backup of HDMI signal source. Moreover, the impedance of the electronic switch in the high-speed signal system is smaller than that of the physical switch such as the relay, thereby reducing the occurrence of impedance phenomenon, and realizing the demand for HDMI signal backup switching.

[0044] Furthermore, the HDMI output terminal 1B includes a first HDMI output terminal 1B1 and a second HDMI output terminal 1B2, wherein:

[0045] The HDMI input terminal 1A is connected to the input terminal of the first electronic switch module 20; the output terminal of the first electronic switch module 20 is respectively connected to the input terminal of the diverter module 30 and the input terminal of the second electronic switch module 40; the output terminal of the diverter module 30 is respectively connected to the input terminal of the second electronic switch module 40 and the HDMI second output terminal 1B2; the output terminal of the second electronic switch module 40 is connected to the HDMI first output terminal 1B1;

[0046] The input end of the power taking module 50 is connected to the HPD pin of the HDMI input terminal 1A; the output end of the power taking module 50 supplies power to the first electronic switch module 20 and the second electronic switch module 40 .

[0047] When implementing it, Figure 2 As shown, the HDMI output terminal 1B includes a first HDMI output terminal 1B1 and a second HDMI output terminal 1B2, wherein: the HDMI input terminal 1A is HDMI_INA; the first HDMI output terminal 1B1 is HDMI_OUT_A1, and the second HDMI output terminal 1B2 is HDMI_OUT_A0;

[0048] The HDMI input terminal 1A is connected to the input terminal of the first electronic switch module 20; the output terminal of the first electronic switch module 20 has two paths, one of which is connected to the input terminal of the diverter module 30, and the other is connected to the input terminal of the second electronic switch module 40; the output terminal of the diverter module 30 is respectively connected to the input terminal of the second electronic switch module 40 and the HDMI second output terminal 1B2; the output terminal of the second electronic switch module 40 is connected to the HDMI first output terminal 1B1;

[0049] The input end of the power taking module 50 is connected to the HPD pin of the HDMI input terminal 1A; the output end of the power taking module 50 is connected to the first electronic switch module 20 and the second electronic switch module 40 to supply power to the first electronic switch module 20 and the second electronic switch module 40.

[0050] When the HDMI input terminal 1A receives the HDMI signal, the HDMI input terminal 1A sends the input signal to the first electronic switch module 20 (TMDSSWITCH: PI3WVR13412) for selection, and then sends it to the second electronic switch module 40 (TMDSSplitter: LT86102UXE) for shunting the HDMI signal, one of which is directly sent to the HDMI second output terminal 1B2 for output, and the other signal is sent to the second electronic switch module 40 for selection and output to the HDMI first output terminal 1B1, so as to achieve the output of dual-channel backup signals;

[0051] When the power is off, the power supply of the two TMDSSWITCHs (PI3WVR13412), i.e., the first electronic switch module 20 and the second electronic switch module 40, automatically switches to the HDMI line to take power, and the two TMDSSWITCHs switch the input signal to the HDMI_OUT_A1 port for output to ensure that the HDMI signal can be output normally when the circuit is powered off. In this embodiment, two HDMI output terminals are provided, and the two HDMI output terminals are respectively connected to backup devices, which include but are not limited to video processors, storage devices, etc. In this embodiment, dual-channel backup is performed by two HDMI output terminals, which can avoid the problem of signal loss when the main backup is abnormal.

[0052] Furthermore, the power taking module 50 includes a diode D31, a magnetic bead FB30, a capacitor C91, a capacitor C92, a capacitor C93, a capacitor C94, a resistor R1, a resistor R147 and a voltage regulator U10, wherein:

[0053] The anode of the diode D31 is connected to the HPD pin of the HDMI input terminal 1A, and the cathode is connected to the input terminal of the voltage regulator U10 through the magnetic bead FB30; the output terminal of the voltage regulator U10 is respectively connected to the first electronic switch module 20 and the second electronic switch module 40;

[0054] The connection node between the magnetic bead FB30 and the input end of the voltage regulator U10 is grounded through capacitors C91 and C92 respectively;

[0055] The connection node between the magnetic bead FB30 and the input end of the voltage regulator U10 is connected to the enable end of the voltage regulator U10 through the resistor R1; the connection node between the resistor R1 and the enable end of the voltage regulator U10 is grounded through the resistor R147;

[0056] The output end of the voltage regulator U10 is grounded through capacitors C93 and C94 respectively.

[0057] When implementing it, Figure 3 _ Fig. 9As shown, the power taking module 50 includes a diode D31, a magnetic bead FB30, a capacitor C91, a capacitor C92, a capacitor C93, a capacitor C94, a resistor R1, a resistor R147 and a voltage regulator U10, wherein: the first electronic switch module 20 is a switch chip U1; the second electronic switch module 40 is a switch chip U2; the switch chip U1 and the switch chip U2 are selected from low-power electronic switch chips with a model of PI3WVR13412 and a power consumption of 1mW; the shunt module 30 is a shunt U3, and the model of the shunt U3 is LT86102UXE; by selecting the low-power consumption of the first electronic switch module 20 and the second electronic switch module 40, the normal HDMI signal switching of the first electronic switch module 20 and the second electronic switch module 40 in the low voltage mode is guaranteed;

[0058] The model of diode D31 is BAV70; the magnetic bead FB30 adopts 60R 2A magnetic bead; the parameter of capacitor C91 is 10uF / 10V; the parameter of capacitor C92 is 0.1uF; the parameter of capacitor C93 is 10uF / 6.3V; the parameter of capacitor C94 is 0.1uF; the resistance value of resistor R1 is 4.7K; the resistance value of resistor R147 is 100K, and the model of voltage regulator U10 is RT9013_33GB;

[0059] like Figure 7 As shown, the first anode pin of the diode D31 is connected to the HPD pin (+5V pin) of the HDMI input terminal 1A, and the second anode pin is connected to the +5V terminal; the cathode (third pin) of the diode D31 is connected to the input terminal (first pin) of the voltage regulator U10 through the magnetic bead FB30; the output terminal (fifth pin) of the voltage regulator U10 is connected to the first electronic switch module 20 and the second electronic switch module 40 respectively, and supplies power to the first electronic switch module 20 and the second electronic switch module 40; the connection node between the magnetic bead FB30 and the input terminal of the voltage regulator U10 is grounded through the capacitor C91 and the capacitor C92 respectively; the connection node between the magnetic bead FB30 and the input terminal of the voltage regulator U10 is connected to the enable terminal (third pin) of the voltage regulator U10 through the resistor R1; the connection node between the resistor R1 and the enable terminal of the voltage regulator U10 is grounded through the resistor R147; the output terminal (fifth pin) of the voltage regulator U10 is the VCCDA1_33 terminal and is grounded through the capacitor C93 and the capacitor C94 respectively.

[0060] like Figure 3As shown, the 2nd, 5th, 8th, 11th, 17th, 20_23rd pins of the HDMI input terminal 1A are grounded; the 1st, 3rd, 4th, 6th, 7th, 9th, 10th pins are connected to the RClamp7534P protection modules U4 and U5; the 13th pin is connected to the zero resistor R7; the 15th, 16th, 19th pins are connected to the CESD05MS0603 protection module; the 18th pin is the PHD pin and can output a +5V voltage; the 18th pin is grounded through the resistors R13 and R15; the 18th pin is connected to the 19th pin of the shunt U1;

[0061] like Figure 6 As shown, the 2nd, 4th, 6th, 11th, and 18th pins of the switch chip U1 (first electronic switch module 20) are connected to the 1st, 3rd, 4th, 6th, 7th, 9th, 10th, 15th, 16th, and 19th pins of the HDMI input terminal 1A; the 13th and 14th pins of the switch chip U1 are connected to the 15th and 16th pins of the HDMI input terminal 1A through the NDS331N field effect transistors Q15 and Q16; the 15th pin of the switch chip U1 is connected to the 16th pin of the switch chip U2 (second electronic switch module 40); the switch chip The 15th and 16th pins of U1 are connected to the 15th and 16th pins of the switch chip U2; the 19th and 20th pins of the switch chip U1 are connected to the 72nd and 73rd pins of the shunt U3; the 21st and 34th pins of the switch chip U1 are connected to the VCCDA1_33 terminal; the 23rd and 24th pins of the switch chip U1 are connected to the 53rd / 54th pins of the shunt U3; the 35th-42nd pins of the switch chip U1 are connected to the shunt U3; the 26th-33rd pins of the switch chip U1 are connected to the 35th-42nd pins of the switch chip U2;

[0062] like Figure 8 As shown, the 3rd, 4th, 6-11th pins of the switch chip U2 are connected to the first HDMI output terminal (HDMI_OUT1_A1); the 12th, 21st, 34th pins of the switch chip U2 are connected to the VCCDA1-33 terminals; the 13th and 14th pins of the switch chip U2 are connected to the 15th and 16th pins of the first HDMI output terminal through the NDS331N field effect transistors Q19 and Q20; the 18th pin of the switch chip U2 is connected to the 19th pin of the first HDMI output terminal through the resistors R174 and R176 respectively. pins 19 and 20 of the switch chip U2 are connected to the 72nd and 73rd pins of the shunt U3; the 23rd and 24th pins of the switch chip U2 are connected to the 19th and 20th pins of the switch chip U1 of the shunt U3; the 26th-33rd pins of the switch chip U2 are connected to the 29th-32nd and 35th-38th pins of the shunt U3; the 35th-42nd pins of the switch chip U2 are connected to the 26th-33rd pins of the switch chip U1; the 40th-43rd and 46th-49th pins of the shunt U3 are connected to the second output terminal of HDMI.

[0063] In this embodiment, by designing the circuit structure of the power taking module 50, it is possible to take power from the HPD+5V terminal of the HDMI input terminal 1A in the event of a power failure, while ensuring that the circuit can normally power the first electronic switch module 20 and the second electronic switch module 40 in the low voltage mode. The power output of the entire circuit structure is stable, ensuring normal HDMI signal backup switching.

[0064] Furthermore, the HDMI input terminal 1A and the HDMI output terminal 1B are both provided with a protection module.

[0065] When implementing it, Figure 4 , Figure 5 As shown, both the HDMI input terminal 1A and the HDMI output terminal 1B are provided with protection modules. The protection modules include but are not limited to the RClamp7534P protection module and the CESD05MS0603 protection module to prevent the HDMI input and output ports from having problems such as data errors or transmission interruptions caused by electrostatic discharge during high-speed data transmission, thereby affecting HDMI signal backup.

[0066] The embodiment of the utility model further provides an electronic device, which adopts any of the above-mentioned novel HDMI signal backup switching circuits. The electronic device includes but is not limited to a video processor, an HDMI backup device, a storage device, and the like.

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel HDMI signal backup switching circuit, characterized in that: It comprises an HDMI input terminal (1A), an HDMI output terminal (1B), a first electronic switch module (20), a diverter module (30), a second electronic switch module (40) and a power extraction module (50), wherein: The HDMI input terminal (1A) is respectively connected to the splitter module (30) and the second electronic switch module (40) through the first electronic switch module (20); the output terminal of the second electronic switch module (40) is connected to the HDMI output terminal (1B); The power taking module (50) takes power from the HPD pin of the HDMI input terminal (1A) to supply power to the first electronic switch module (20) and the second electronic switch module (40).

2. The novel HDMI signal backup switching circuit according to claim 1, characterized in that: The HDMI output terminal (1B) comprises a first HDMI output terminal (1B1) and a second HDMI output terminal (1B2), wherein: The HDMI input terminal (1A) is connected to the input terminal of the first electronic switch module (20); the output terminal of the first electronic switch module (20) is respectively connected to the input terminal of the diverter module (30) and the input terminal of the second electronic switch module (40); the output terminal of the diverter module (30) is respectively connected to the input terminal of the second electronic switch module (40) and the second HDMI output terminal (1B2); the output terminal of the second electronic switch module (40) is connected to the first HDMI output terminal (1B1); The input end of the power taking module (50) is connected to the HPD pin of the HDMI input end (1A); and the output end of the power taking module (50) supplies power to the first electronic switch module (20) and the second electronic switch module (40).

3. The novel HDMI signal backup switching circuit according to claim 1 or 2, characterized in that: The power taking module (50) comprises a diode D31, a magnetic bead FB30, a capacitor C91, a capacitor C92, a capacitor C93, a capacitor C94, a resistor R1, a resistor R147 and a voltage regulator U10, wherein: The anode of the diode D31 is connected to the HPD pin of the HDMI input terminal (1A), and the cathode is connected to the input terminal of the voltage regulator U10 through the magnetic bead FB30; the output terminal of the voltage regulator U10 is respectively connected to the first electronic switch module (20) and the second electronic switch module (40) for power supply; The connection node between the magnetic bead FB30 and the input end of the voltage regulator U10 is grounded through capacitors C91 and C92 respectively; The connection node between the magnetic bead FB30 and the input end of the voltage regulator U10 is connected to the enable end of the voltage regulator U10 through the resistor R1; the connection node between the resistor R1 and the enable end of the voltage regulator U10 is grounded through the resistor R147; The output end of the voltage regulator U10 is grounded through capacitors C93 and C94 respectively.

4. The novel HDMI signal backup switching circuit according to claim 3, characterized in that: The power consumption of the first electronic switch module (20) and the second electronic switch module (40) is 1 mW.

5. The novel HDMI signal backup switching circuit according to claim 4, characterized in that: The model of the first electronic switch module (20) and the second electronic switch module (40) is PI 3WVR13412.

6. The novel HDMI signal backup switching circuit according to claim 3, characterized in that: The model of the diverter module (30) is LT86102UXE.

7. The novel HDMI signal backup switching circuit according to claim 1, characterized in that: The models of the HDMI input terminal (1A) and the HDMI output terminal (1B) are HDMI-A-FEMAL-SMD.

8. The novel HDMI signal backup switching circuit according to claim 1, characterized in that: The HDMI input end (1A) and the HDMI output end (1B) are both provided with a protection module.

9. An electronic device, characterized in that: A novel HDMI signal backup switching circuit as described in any one of claims 1 to 8 is adopted.

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