HDMI switching circuit of integrated hardware softdog

Abstract

The utility model discloses a high-definition multimedia interface (HDMI) switching circuit of an integrated hardware softdog, which comprises a main board and HDMI Dongle equipment, the main board is provided with a first HDMI port, the HDMI Dongle equipment is provided with a second HDMI port, the HDMI switching circuit further comprises a switching board, a first interface J1 of the switching board is in pluggable connection with the first HDMI port, a second interface J2 of the switching board is in pluggable connection with the HDMI Dongle equipment, the main board is provided with a power supply circuit, and the power supply circuit is connected with the HDMI Dongle equipment. The power supply circuit transmits a first voltage to the adapter plate, the adapter plate is provided with a transfer circuit, and the transfer circuit transmits the received first voltage to the HDMI Dongle equipment. According to the utility model, the existing HDMI switching circuit is improved, the mainboard can provide 5V power supply for the HDMI Dongle equipment, and a power supply line does not need to be additionally connected to the HDMI Dongle equipment, so that the cost is saved, and the appearance is more attractive.

Description

Technical Field

[0001] The utility model relates to an HDMI conversion circuit, specifically to an HDMI conversion circuit of an integrated hardware 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] When the HDMI Dongle device is equipped with an adapter, an additional USB extension cable needs to be provided 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 is costly, not aesthetically pleasing, and the USB interface is occupied.

[0004] In view of this, it is necessary to improve the existing HDMI conversion circuit. Content 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 conversion circuit of an integrated hardware dongle. The purpose of designing this HDMI conversion circuit is to cancel the power supply to the HDMI Dongle device by the USB extension cable.

[0006] To solve the above technical problem, the utility model is realized through the following solutions: An HDMI conversion circuit of an integrated hardware 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 conversion 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 a resistor R1, a resistor R2, a resistor R3, a single-channel current-limiting power switch U1, a capacitor C5, a capacitor C6, a capacitor C7, and a diode D1;

[0009] The first end of the resistor R1 is connected to the 17PIN terminal GND of the first HDMI port. The second end of the resistor R1 is respectively connected to the first end of the resistor R2, the first end of the resistor R3, and the terminal EN of the single-channel current-limiting power switch U1. The second end of the resistor R3 is grounded. The second end of the resistor R2 is connected to the terminal VIN of the single-channel current-limiting power switch U1 and the 5VA circuit. The terminal GND of the single-channel current-limiting power switch U1 is grounded, and its terminal OUT is respectively connected to the first end of the capacitor C6, the first end of the capacitor C7, the positive electrode of the diode D1, and the output 5V_HDMI. The negative electrode of the diode D1 outputs HDMI1 / 5V. The capacitor C5 is connected between the terminal GND of the single-channel current-limiting power switch U1 and the terminal FLT of the single-channel current-limiting power switch U1.

[0010] Further, the first voltage is 5V.

[0011] Further, the 18PIN terminals of the first interface J1 and the 18PIN terminals of the second interface J2 are electrically connected. After the first HDMI port is plugged into the first interface J1, the 18PIN terminal of the first HDMI port supplies power to the 18PIN terminal of the second interface J2.

[0012] Still further, the structure of the transfer circuit is as follows: A resistor R101 is connected between the 17PIN terminal GND of the first interface J1 and the 17PIN terminal of the second interface J2. The first end of a resistor R102 is connected to the circuit node between the 17PIN terminal GND of the first interface J1 and the resistor R101. The second end of the resistor R102 is grounded.

[0013] Still further, the resistor R101 is a 0-ohm resistor, and the resistor R102 is a 15K resistor.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] 1. The present utility model improves the existing HDMI adapter circuit, so that after the main board and the adapter board are plugged into each other, the main board can provide 5V power supply to the HDMI Dongle device, eliminating the need to connect an additional power supply cable to the HDMI Dongle device, saving costs and making the appearance more beautiful.

[0016] 2. After the ordinary HDMI peripherals are connected, the HDMI 18PIN (+5V Power) is provided by the peripherals, which does not affect the normal use of ordinary HDMI peripherals.

[0017] 3. The present utility model does not require a separate USB conversion cable to supply power to the HDMI Dongle device, which can save a USB conversion cable. The USB ports left on the main board can be utilized more fully. At the same time, it also makes the matching of the main board and the adapter board unique, and the appearance is more coordinated. Description of the Drawings

[0018] Figure 1 is a connection block diagram of the HDMI Dongle device and the main board in the prior art.

[0019] 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.

[0020] Figure 3 is a circuit diagram of the adapter board of the present utility model.

[0021] Figures 4 - 5 After the circuit connections form a power supply circuit diagram on the main board of the present utility model. Detailed Embodiment

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the 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 embodiments described in the present utility model are only a part of the embodiments of the present utility model, rather than all 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.

[0023] 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.

[0024] Embodiment 1: The specific structure of the present utility model is as follows:

[0025] Please refer to the attached Figures 2 - 5, The HDMI conversion circuit of an integrated hardware encryption dog of the present 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 conversion circuit further includes a conversion board. The first interface J1 of the conversion 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 conversion board. The conversion board is provided with a transfer circuit, which sends the received first voltage into the HDMI Dongle device. Specifically, the first voltage is 5V. 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 the +5V POWER power supply terminal. The 18th PIN terminal of the first interface J1 is electrically connected to the 18th PIN terminal of the second interface J2. 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.

[0026] The power supply circuit includes a resistor R1, a resistor R2, a resistor R3, a single-channel current-limiting power switch U1, a capacitor C5, a capacitor C6, a capacitor C7, and a diode D1. Preferably, resistor R1 = 100R, resistor R2 = 2.7K, resistor R3 = 4.7K, the single-channel current-limiting power switch U1 adopts a single-channel current-limiting power switch of the JW7115S-2 model, capacitor C5 = 0.1uF, capacitor C6 = 10uF, capacitor C7 = 0.1uF.

[0027] The first end of the resistor R1 is connected to the 17PIN terminal GND of the first HDMI port. The second end of the resistor R1 is respectively connected to the first end of the resistor R2, the first end of the resistor R3, and the terminal EN of the single-channel current-limiting power switch U1. The second end of the resistor R3 is grounded. The second end of the resistor R2 is connected to the terminal VIN of the single-channel current-limiting power switch U1 and the 5VA circuit. The terminal GND of the single-channel current-limiting power switch U1 is grounded. Its terminal OUT is respectively connected to the first end of the capacitor C6, the first end of the capacitor C7, the positive pole of the diode D1, and outputs 5V_HDMI. The negative pole of the diode D1 outputs HDMI1 / 5V. The capacitor C5 is connected between the terminal GND of the single-channel current-limiting power switch U1 and the terminal FLT of the single-channel current-limiting power switch U1.

[0028] The structure of the transfer circuit is as follows: A resistor R101 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 R102 is connected to the circuit node between the 17th PIN terminal GND of the first interface J1 and the resistor R101, and the second end of the resistor R102 is grounded. The resistor R101 is a 0-ohm resistor, and the resistor R102 is a 15K resistor.

[0029] The following is the specific working principle of the HDMI transfer circuit of an integrated hardware dongle of the present invention:

[0030] As Figures 2 - 5 shown, the first interface J1 (also called the first HDMI male head) on the transfer board is docked with the CP1 port (also called the first HDMI female head) on the main board. The resistor R102 uses a 15K resistor, and the resistor R101 uses a 0-ohm resistor. The second interface J2 (also called the second HDMI female head) is docked with the HDMI Dongle device.

[0031] The CP1 port of the main board (also called the second HDMI female head), the 5VA circuit is a 5V voltage circuit, that is, the 5V voltage generated after the main board is powered on. HDMI1 / 5V is the 5V voltage provided for the HDMI peripheral device. When a common HDMI device is connected, since the 17th PIN of the CP1 port is grounded, the 4th PIN of the single-channel current-limiting power switch U1 is pulled low, and the single-channel current-limiting power switch U1 has no voltage output. The 18PIN-HDMI1 / 5V on the port CP1 is powered by the HDMI peripheral device, which does not affect the normal use of the HDMI device.

[0032] When the HDMI Dongle device and the transfer board of the present invention are connected, since the resistor R102 is a 15K resistor, after being connected in parallel with the resistor R3 and pulled up and divided by the resistor R2, the EN of the 4th PIN of the single-channel current-limiting power switch U1 is 1.85V, which is higher than the enabling level of 1V. The single-channel current-limiting power switch U1 is turned on and has a 5V voltage output to the 18PIN (+5V Power) of the port CP1, and powers the HDMI Dongle device through the transfer board. The diode D1 is an anti-backflow circuit. When a common HDMI device is connected, it prevents HDMI1 / 5V from flowing back to 5VA through the single-channel current-limiting power switch U1, which may cause abnormal operation of the main board.

[0033] By setting the HDMI port lines of the adapter board and the main board, it is ensured 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. Then, there is no need for a separate USB cable to supply power to the HDMI Dongle device, which can save a USB cable. The USB ports on the main board can be utilized more fully. At the same time, it also makes the matching of the main board and the adapter board unique, and the appearance is more coordinated.

[0034] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An HDMI conversion circuit for an integrated hardware 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, 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 R1, a resistor R2, a resistor R3, a single-channel current-limiting power switch U1, a capacitor C5, a capacitor C6, a capacitor C7, and a diode D1; The first end of the resistor R1 is connected to the 17th PIN terminal GND of the first HDMI port. The second end of the resistor R1 is respectively connected to the first end of the resistor R2, the first end of the resistor R3, and the terminal EN of the single-channel current-limiting power switch U1. The second end of the resistor R3 is grounded. The second end of the resistor R2 is connected to the terminal VIN of the single-channel current-limiting power switch U1 and the 5VA circuit. The terminal GND of the single-channel current-limiting power switch U1 is grounded. Its terminal OUT is respectively connected to the first end of the capacitor C6, the first end of the capacitor C7, the positive electrode of the diode D1, and the output 5V_HDMI. The negative electrode of the diode D1 outputs HDMI1 / 5V. The capacitor C5 is connected between the terminal GND of the single-channel current-limiting power switch U1 and the terminal FLT of the single-channel current-limiting power switch U1.

2. The HDMI conversion circuit of an integrated hardware encryption dongle according to claim 1, characterized in that The first voltage is 5V.

3. The HDMI conversion circuit of an integrated hardware dongle according to claim 1, wherein 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 hardware encryption dongle according to claim 1, wherein The structure of the transfer circuit is as follows: A resistor R101 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 R102 is connected to the circuit node between the 17th PIN terminal GND of the first interface J1 and the resistor R101. The second end of the resistor R102 is grounded.

5. The HDMI conversion circuit of an integrated hardware dongle according to claim 4, characterized in that, The resistor R101 is a 0-ohm resistor, and the resistor R102 is a 15K resistor.

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