HDMI switching circuit of integrated software softdog

Abstract

The utility model discloses an HDMI switching circuit of an integrated software softdog, comprising a mainboard, an HDMI Dongle device and a switching board, the mainboard is provided with a first HDMI port, the HDMI Dongle device is provided with a second HDMI port, a first interface J1 of the switching board is connected with the first HDMI port in a pluggable manner, a second interface J2 of the switching board is connected with the HDMI Dongle device in a pluggable manner, the mainboard is provided with a power supply circuit, and the power supply circuit is connected with the HDMI Dongle device in a pluggable manner. The power supply circuit transmits a 5V power supply to the adapter plate, the adapter plate is provided with a transfer circuit, and the transfer circuit transmits a received first voltage to the HDMI Dongle device. According to the utility model, the HDMI port lines of the adapter plate and the mainboard are arranged, so that the mainboard can provide 5V power supply for HDMI Dongle equipment after the adapter plate is inserted. According to the utility model, one USB patch cord can be saved, and the appearance is more harmonious.

Description

Technical Field

[0001] The utility model relates to an HDMI adapter circuit, specifically to an HDMI adapter circuit of an integrated software dongle. Background Art

[0002] As Figure 1 shown Figure 1 is a connection block diagram of an HDMI Dongle device and a main board in the prior art. After the HDMI Dongle device is equipped with an adapter, and then paired with a USB extension cable, where the adapter is used to transfer the HDMI signal, and the USB extension cable is used to supply power to the HDMI Dongle device.

[0003] In the prior art, when the HDMI Dongle device is equipped with an adapter, an additional USB extension cable is required to supply power to the HDMI Dongle device. Besides affecting the aesthetics of the whole machine, the USB extension cable increases the cost of the whole machine. Using a USB extension cable to supply power to the HDMI Dongle has a high cost, is not aesthetic, and occupies the USB interface.

[0004] In view of this, it is necessary to improve the existing HDMI adapter circuit. Summary of the Utility Model

[0005] Aiming at the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide an HDMI adapter circuit of an integrated software dongle. The purpose of designing this HDMI adapter circuit is to cancel the USB extension cable to supply power to the HDMI Dongle device.

[0006] To solve the above technical problem, the utility model is realized through the following scheme: An HDMI adapter circuit of an integrated software dongle of the utility model includes a main board and an HDMI Dongle device. The main board has a first HDMI port, and the HDMI Dongle device has a second HDMI port. The HDMI adapter circuit further includes an adapter board. The first interface J1 of the adapter board is pluggably connected to the first HDMI port, and its second interface J2 is pluggably connected to the HDMI Dongle device. The main board is provided with a power supply circuit, and this power supply circuit delivers a first voltage to the adapter board. The adapter board is provided with a transfer circuit, and this transfer circuit sends the received first voltage into the HDMI Dongle device;

[0007] The first HDMI port, the second HDMI port, the first interface J1, and the second interface J2 are all provided with 19PIN terminals. Among them, the 18th PIN terminal of the first HDMI port is set as a +5V POWER power supply terminal;

[0008] The power supply circuit includes resistor R3, resistor R4, resistor R5, resistor R41, resistor R51, resistor R6, resistor R7, resistor R8, triode Q1, transistor Q2, transistor Q3, capacitor C11, capacitor C12, capacitor C13, capacitor C14, and capacitor C15;

[0009] The first end of resistor R5 is connected to the 17th PIN terminal GND of the first HDMI port. The second end of resistor R5 is respectively connected to the first end of resistor R3 and the first end of resistor R4. The second end of resistor R4 is grounded. The second end of resistor R3 is connected to +3.3V_Standby. The second end of resistor R5 is designated as HDMI_PIN17;

[0010] The first end of resistor R41 is connected to HDMI_5V_EN, and its second end is respectively connected to the base of triode Q1 and the first end of resistor R51. The second end of resistor R51 is grounded;

[0011] The emitter of triode Q1 is grounded, and its collector is respectively connected to the first end of resistor R6, the first end of resistor R7, and the first end of resistor R8;

[0012] The second end of resistor R6 is respectively connected to the first end of capacitor C12 and the gate of transistor Q2. The drain of transistor Q2 is connected to 5VA and the first end of capacitor C11. The second end of capacitor C11 is grounded. The source of transistor Q2 is respectively connected to the second end of capacitor C12, the second end of resistor R7, the first end of capacitor C13, and the source of transistor Q3. The second end of capacitor C13 is connected to the second end of resistor R8 and the gate of transistor Q3;

[0013] The drain of transistor Q3 is respectively connected to the first end of capacitor C14, the first end of capacitor C15, and the 18th PIN of the first HDMI port HDMI1 / 5V. The second end of capacitor C14 is grounded. The second end of capacitor C15 is grounded.

[0014] Further, the first voltage is 5V.

[0015] Further, there is an electrical connection between the 18th PIN terminal of the first interface J1 and the 18th PIN terminal of the second interface J2. After the first HDMI port is plugged into the first interface J1, the 18th PIN terminal of the first HDMI port supplies power to the 18th PIN terminal of the second interface J2.

[0016] Further, the structure of the transfer circuit is as follows: A resistor R1 is connected between the 17th PIN terminal GND of the first interface J1 and the 17th PIN terminal of the second interface J2. One end of a resistor R2 is connected to the circuit node between the 17th PIN terminal GND of the first interface J1 and the resistor R1, and the other end of the resistor R2 is grounded.

[0017] Furthermore, the resistor R1 is a 0-ohm resistor, and the resistor R2 is a 15K resistor.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows: By setting the HDMI port lines of the adapter board and the main board, the present utility model ensures that after the adapter board is inserted, the main board can provide 5V power supply to the HDMI Dongle device. When a common HDMI peripheral is connected, the HDMI 18PIN (+5V Power) is provided by the peripheral, which does not affect the normal use of the common HDMI peripheral. There is no need for a separate USB conversion cable to supply power to the HDMI Dongle device, saving a USB conversion cable. The unused USB port on the main board can be fully utilized, making the matching between the main board and the adapter board unique and the appearance more coordinated. Description of the Drawings

[0019] Figure 1 is a connection block diagram of the HDMI Dongle device and the main board in the prior art.

[0020] Figure 2 is a signal transmission principle block diagram among the main board, the adapter board and the Dongle device of the present utility model.

[0021] Figure 3 is a circuit diagram of the adapter board of the present utility model.

[0022] Figures 4 - 5 After the circuit connections are made, it forms a power supply circuit diagram on the main board of the present utility model.

[0023] Figure 6 is a logic control diagram of the present utility model. Detailed Embodiment

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. Obviously, the described embodiments of the present utility model are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] Embodiment 1: The specific structure of the present utility model is as follows:

[0027] Please refer to the attached Figures 2 - 5 , an HDMI conversion circuit of an integrated software encryption dog of the present utility model, comprising a main board and an HDMI Dongle device. The main board has a first HDMI port, and the HDMI Dongle device has a second HDMI port. The HDMI conversion circuit further comprises a conversion board. A first interface J1 of the conversion board is pluggably connected to the first HDMI port, and a second interface J2 of the conversion board is pluggably connected to the HDMI Dongle device. The main board is provided with a power supply circuit, and the power supply circuit delivers a first voltage to the conversion board, and the first voltage is 5V. The conversion board is provided with a transfer circuit, and the transfer circuit sends the received first voltage into the HDMI Dongle device.

[0028] The first HDMI port, the second HDMI port, the first interface J1, and the second interface J2 are all provided with 19PIN terminals. Among them, the 18th PIN terminal of the first HDMI port is set as a +5V POWER power supply terminal.

[0029] The power supply circuit includes a resistor R3, a resistor R4, a resistor R5, a resistor R41, a resistor R51, a resistor R6, a resistor R7, a resistor R8, a triode Q1, a transistor Q2, a transistor Q3, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, and a capacitor C15. Specifically, resistor R3 = 9.1K, resistor R4 = 12K, resistor R5 = 0R, resistor R41 = 4.7K, resistor R51 = 4.7K, resistor R6 = 10K, resistor R7 = 47K, resistor R8 = 10K. The triode Q1 is a 3904 type triode, the transistor Q2 is an AO3407 type transistor, the transistor Q3 is an AO3407 type transistor, capacitor C11 = 10uF, capacitor C12 = 0.1uF, capacitor C13 = 0.1uF, capacitor C14 == 0.1uF, and capacitor C15 == 10uF.

[0030] A first end of the resistor R5 is connected to the 17th PIN terminal GND of the first HDMI port. A second end of the resistor R5 is respectively connected to a first end of the resistor R3 and a first end of the resistor R4. A second end of the resistor R4 is grounded. A second end of the resistor R3 is connected to +3.3V_Standby. A second end of the resistor R5 is set as HDMI_PIN17;

[0031] The first end of the resistor R41 is connected to HDMI_5V_EN, and its second end is respectively connected to the base of the triode Q1 and the first end of the resistor R51. The second end of the resistor R51 is grounded.

[0032] The emitter of the triode Q1 is grounded, and its collector is respectively connected to the first end of the resistor R6, the first end of the resistor R7, and the first end of the resistor R8.

[0033] The second end of the resistor R6 is respectively connected to the first end of the capacitor C12 and the gate of the transistor Q2. The drain of the transistor Q2 is connected to 5VA and the first end of the capacitor C11. The second end of the capacitor C11 is grounded. The source of the transistor Q2 is respectively connected to the second end of the capacitor C12, the second end of the resistor R7, the first end of the capacitor C13, and the source of the transistor Q3. The second end of the capacitor C13 is connected to the second end of the resistor R8 and the gate of the transistor Q3.

[0034] The drain of the transistor Q3 is respectively connected to the first end of the capacitor C14, the first end of the capacitor C15, and the 18th PIN of the first HDMI port HDMI1 / 5V. The second end of the capacitor C14 is grounded, and the second end of the capacitor C15 is grounded.

[0035] The 18th PIN terminals of the first interface J1 and the second interface J2 are electrically connected. After the first HDMI port is plugged into the first interface J1, the 18th PIN terminal of the first HDMI port supplies power to the 18th PIN terminal of the second interface J2. The structure of the transfer circuit is as follows: A resistor R1 is connected between the 17th PIN terminal GND of the first interface J1 and the 17th PIN terminal of the second interface J2. The first end of a resistor R2 is connected to the circuit node between the 17th PIN terminal GND of the first interface J1 and the resistor R1. The second end of the resistor R2 is grounded. The resistor R1 is a 0-ohm resistor, and the resistor R2 is a 15K resistor.

[0036] The following is the working principle of the HDMI transfer circuit of an integrated software dongle of the present invention:

[0037] The first interface J1 (HDMI male head) on the transfer board is docked with the CP1 port (HDMI female head) on the main board. The resistance value of the resistor R2 is 15K, and the resistance value of the resistor R1 is 0R. The second J2 (HDMI female head) on the transfer board is docked with the HDMI Dongle device.

[0038] In the CP1 port (HDMI female connector) of the main board, resistor R1 is pulled up to 3.3V Standby, and both transistor Q2 and transistor Q3 are AO3407 P-channel MOS transistors.

[0039] When a common HDMI device is connected, since the 17th PIN in the CP1 port on the main board is grounded, after being divided by resistors R1 and R3, the HDMI_PIN7 outputs an ADC signal of 0 to the MCU. At this time, the MCU output signal HDMI_5V_EN is at a low level, the triode Q1 is not conducting, and the transistor Q3 is in a cut-off state. The 5VA signal on the main board cannot be connected to HDMI1 / 5V, and the HDMI1 / 5V of the CP1 port on the main board is powered by the HDMI peripheral device, which does not affect the normal use of the HDMI device.

[0040] When an HDMI Dongle device and an adapter board are connected, since the resistor R2 has a 15K resistor, after being paralleled with resistor R4 and pulled up and divided by resistor R3, the generated HDMI_PIN7 outputs a 1.4V ADC signal to the MCU. After the MCU recognizes this signal, the MCU output signal HDMI_5V_EN is at a high level, the triode Q1 conducts, and the transistor Q3 conducts. The 5VA voltage on the main board is output to the 18th PIN (+5V Power) of the CP1 port, and the HDMI Dongle device is powered through the adapter board. Among them, transistor Q2 is used to prevent reverse current. When a common HDMI device is connected, it prevents HDMI1 / 5V from flowing back to 5VA through transistors Q2 and Q3, thereby preventing abnormal operation of the main board.

[0041] In summary, by setting the HDMI port lines of the adapter board and the main board, the present utility model ensures that after the adapter board is inserted, the main board can provide 5V power to the HDMI Dongle device. When a common HDMI peripheral device is connected, the HDMI 18PIN (+5V Power) is provided by the peripheral device, which does not affect the normal use of the common HDMI peripheral device. There is no need for a separate USB cable to power the HDMI Dongle device, which can save a USB cable. The unused USB port on the main board can be fully utilized, and at the same time, it makes the matching of the main board and the adapter board unique and the appearance more coordinated.

[0042] The above is only the preferred embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied to other related technical fields, shall be included in the patent protection scope of the present utility model by the same token.

Claims

1. An HDMI conversion circuit for an integrated software dongle, comprising a main board and an HDMI Dongle device. The main board has a first HDMI port, and the HDMI Dongle device has a second HDMI port. It is characterized in that, The HDMI adapter circuit further includes an adapter board. The first interface J1 of the adapter board is pluggably connected to the first HDMI port, and its second interface J2 is pluggably connected to the HDMI Dongle device. The main board is provided with a power supply circuit, which delivers a first voltage to the adapter board. The adapter board is provided with a transfer circuit, which sends the received first voltage into the HDMI Dongle device; The first HDMI port, the second HDMI port, the first interface J1, and the second interface J2 are all provided with 19PIN terminals. Among them, the 18th PIN terminal of the first HDMI port is set as a +5V POWER power supply terminal; The power supply circuit includes a resistor R3, a resistor R4, a resistor R5, a resistor R41, a resistor R51, a resistor R6, a resistor R7, a resistor R8, a triode Q1, a transistor Q2, a transistor Q3, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, and a capacitor C15; The first end of the resistor R5 is connected to the 17th PIN terminal GND of the first HDMI port. The second end of the resistor R5 is respectively connected to the first end of the resistor R3 and the first end of the resistor R4. The second end of the resistor R4 is grounded. The second end of the resistor R3 is connected to +3.3V_Standby. The second end of the resistor R5 is set as HDMI_PIN17; The first end of the resistor R41 is connected to HDMI_5V_EN, and its second end is respectively connected to the base of the triode Q1 and the first end of the resistor R51. The second end of the resistor R51 is grounded; The emitter of the triode Q1 is grounded, and its collector is respectively connected to the first end of the resistor R6, the first end of the resistor R7, and the first end of the resistor R8; The second end of the resistor R6 is respectively connected to the first end of the capacitor C12 and the gate of the transistor Q2. The drain of the transistor Q2 is connected to 5VA and the first end of the capacitor C11. The second end of the capacitor C11 is grounded. The source of the transistor Q2 is respectively connected to the second end of the capacitor C12, the second end of the resistor R7, the first end of the capacitor C13, and the source of the transistor Q3. The second end of the capacitor C13 is connected to the second end of the resistor R8 and the gate of the transistor Q3; The drain of the transistor Q3 is respectively connected to the first end of the capacitor C14, the first end of the capacitor C15, and the 18th PIN foot HDMI1 / 5V of the first HDMI port. The second end of the capacitor C14 is grounded. The second end of the capacitor C15 is grounded.

2. The HDMI conversion circuit of an integrated software dongle according to claim 1, wherein The first voltage is 5V.

3. The HDMI conversion circuit of an integrated software dongle according to claim 1, characterized in that, The 18th PIN terminals of the first interface J1 and the second interface J2 are electrically connected. After the first HDMI port and the first interface J1 are plugged in, the 18th PIN terminal of the first HDMI port supplies power to the 18th PIN terminal of the second interface J2.

4. The HDMI conversion circuit of an integrated software dongle according to claim 1, characterized in that, The structure of the transfer circuit is as follows: A resistor R1 is connected between the 17th PIN terminal GND of the first interface J1 and the 17th PIN terminal of the second interface J2. The first end of a resistor R2 is connected to the circuit node between the 17th PIN terminal GND of the first interface J1 and the resistor R1, and the second end of the resistor R2 is grounded.

5. The HDMI conversion circuit of an integrated software dongle according to claim 4, characterized in that The resistor R1 is a 0-ohm resistor, and the resistor R2 is a 15K resistor.

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