HDMI interface grounding filter circuit

Abstract

The utility model belongs to the technical field of HDMI (High Definition Multimedia Interface) filtering, and particularly discloses an HDMI grounding filter circuit which comprises diodes D1, D2, D3 and D4, a transient suppression protection diode D5, a transient suppression protection diode D6, capacitors C1 and C2, an inductor L1, a first grounding pin, a second grounding pin, a third grounding pin, a fourth grounding pin, a fifth grounding pin and a connection relation thereof. According to the utility model, the filter circuit is additionally arranged at the input end of the HDMI interface chip J1, good grounding is adopted, stable reference potential is provided, the independent grounding layer is arranged, and a plurality of grounding pins of the HDMI interface grounding filter circuit are connected with the grounding layer in a multi-point grounding mode, so that low grounding impedance is ensured, interference current is filtered out, and the reliability of the HDMI interface chip J1 is improved. Therefore, no noise current exists on the output cable, and electromagnetic radiation interference is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to HDMI interface filtering technical field, especially a kind of HDMI interface grounding filter circuit. BACKGROUND

[0002] All electronic equipment will have HDMI interface at input and output end.HDMI interface is connected by internal HDMI control chip and external cable.When carrying out data exchange, if HDMI interface internal chip line is not filtered by internal filter circuit, external cable becomes antenna in nature, and the noise of HDMI interface chip is taken out of equipment, thereby causing electromagnetic radiation interference.HDMI interface filtering plays an important role in the electromagnetic radiation of entire electronic equipment. SUMMARY

[0003] The utility model discloses a HDMI interface grounding filter circuit to solve the technical problems in the background art.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A kind of HDMI interface grounding filter circuit, including HDMI interface chip J1;The anode of diode D1 is electrically connected to the pin 16 of HDMI interface chip J1, the cathode of diode D1 is electrically connected to first ground pin, the cathode of diode D2 is electrically connected to the pin 16 of HDMI interface chip J1, the anode of diode D2 is electrically connected to the output terminal VOUT of power supply voltage stabilizing circuit;The anode of diode D3 is electrically connected to the pin 15 of HDMI interface chip J1, the cathode of diode D3 is electrically connected to second ground pin, the cathode of diode D4 is electrically connected to the pin 15 of HDMI interface chip J1, the anode of diode D4 is electrically connected to the output terminal VOUT of power supply voltage stabilizing circuit.

[0006] The following is the further defined technical scheme of the utility model, one end of transient suppression protection diode D6 is electrically connected to the pin 14 of HDMI interface chip J1, the other end of transient suppression protection diode D6 is electrically connected to third ground pin.

[0007] The following is the further defined technical scheme of the utility model, one end of transient suppression protection diode D5 is electrically connected to the pin 19 of HDMI interface chip J1, the other end of transient suppression protection diode D5 is electrically connected to third ground pin.

[0008] The following is the further defined technical scheme of the utility model, pin 1, pin 4, pin 7, pin 10 and pin 13 of HDMI interface chip J1 are all electrically connected to third ground pin.

[0009] The power supply voltage stabilizing circuit comprises an input terminal VIN, an output terminal VOUT, capacitors C1 and C2, and an inductor L1, wherein one end of the inductor L1 is electrically connected to the input terminal VIN, the input terminal VIN is connected to a 5V voltage, the other end of the inductor L1 is electrically connected to one end of the capacitor C1 and one end of the capacitor C2, the other end of the capacitor C1 is electrically connected to a fourth grounding pin, the other end of the capacitor C2 is electrically connected to a fifth grounding pin, and the output terminal VOUT is arranged on a line connected with the capacitors C1 and C2 and the inductor L1.

[0010] The first grounding pin, the second grounding pin, the third grounding pin, the fourth grounding pin and the fifth grounding pin are electrically connected to a grounding layer.

[0011] The pin 18 of the HDMI interface chip J1 is electrically connected to the output terminal VOUT of the power supply voltage stabilizing circuit.

[0012] Compared with the prior art, the power supply voltage stabilizing circuit has the following technical effects:

[0013] The power supply voltage stabilizing circuit adds a filter circuit to an input terminal of an HDMI interface chip J1, adopts good grounding, provides a stable reference potential, connects a plurality of grounding pins of an HDMI interface grounding filter circuit with a grounding layer through a multi-point grounding mode by arranging an independent grounding layer, ensures low grounding impedance, filters out interference current, and thus no noise current exists on an output cable, and electromagnetic radiation interference is avoided.

[0014] The power supply voltage stabilizing circuit will be further described below in combination with the drawings and the embodiments. DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0016] Figure 1 is a circuit connection relationship diagram of the present application. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, understandable and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the concept of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0018] As shown in Figure 1 HDMI interface chip J1 is selected from HDMI C model, three pairs of differential lines (D0- and D0+, D1- and D1+, D1- and D1+) and a pair of clock signal lines (CLK- and CLK+) output from the HDMI interface chip J1 are not subjected to effective filtering processing, resulting in relatively large noise on the signal line. Therefore, the input end of the HDMI interface chip J1 is added with a filtering circuit in the embodiment, and a good ground is provided to provide a stable reference potential. The independent ground layer is set, and the multiple ground pins of the HDMI interface ground filtering circuit are connected with the ground layer through the multi-point grounding mode, so as to ensure low ground impedance and filter out interference current, so that there is no noise current on the output cable, and radiation naturally does not occur.

[0019] As shown in Figure 1 An HDMI interface ground filtering circuit mainly comprises diodes D1, D2, D3, D4, transient suppression protection diode D5 (i.e. TVS diode), transient suppression protection diode D6, capacitors C1, C2, inductor L1, first ground pin, second ground pin, third ground pin, fourth ground pin, fifth ground pin and ground layer (not shown in the figure) and the like.

[0020] The pin 16 (differential signal input end, i.e. SDA end) of the HDMI interface chip J1 is electrically connected with the anode of the diode D1, and the cathode of the diode D1 is electrically connected with the first ground pin. The pin 16 of the HDMI interface chip J1 is electrically connected with the cathode of the diode D2, and the anode of the diode D2 is electrically connected with the output end VOUT of the power supply voltage stabilizing circuit. The pin 15 (clock signal input end, i.e. SCL end) of the HDMI interface chip J1 is electrically connected with the anode of the diode D3, and the cathode of the diode D3 is electrically connected with the second ground pin. The pin 15 of the HDMI interface chip J1 is electrically connected with the cathode of the diode D4, and the anode of the diode D4 is electrically connected with the output end VOUT of the power supply voltage stabilizing circuit.

[0021] The pin 14 of the HDMI interface chip J1 is electrically connected with one end of a transient suppression protection diode D6, and the other end of the transient suppression protection diode D6 is electrically connected with a third ground pin. The pin 19 of the HDMI interface chip J1 is electrically connected with one end of a transient suppression protection diode D5, and the other end of the transient suppression protection diode D5 is electrically connected with the third ground pin.

[0022] The pins 1, 4, 7, 10 and 13 of the HDMI interface chip J1 are electrically connected with the third ground pin. The pin 18 of the HDMI interface chip J1 is electrically connected with the output end VOUT of the power voltage stabilizing circuit.

[0023] The power voltage stabilizing circuit comprises an input end VIN, an output end VOUT, capacitors C1 and C2 and an inductor L1, wherein one end of the inductor L1 is electrically connected with the input end VIN, the input end VIN is connected with a 5V voltage, the other end of the inductor L1 is electrically connected with one end of the capacitor C1 and one end of the capacitor C2, the other end of the capacitor C1 is electrically connected with a fourth ground pin, the other end of the capacitor C2 is electrically connected with a fifth ground pin, and the output end VOUT is arranged on a line where the capacitors C1 and C2 and the inductor L1 are connected.

[0024] The first ground pin, the second ground pin, the third ground pin, the fourth ground pin and the fifth ground pin are electrically connected with a ground layer.

[0025] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any person skilled in the art can make many possible changes and modifications to the technical scheme of the present application, or modify it into equivalent embodiments, without departing from the scope of the technical scheme of the present application, by using the disclosed methods and technical contents. Therefore, any equivalent changes made according to the shape, structure and principle of the present application, without departing from the technical scheme of the present application, should be covered by the protection scope of the present application.

Claims

1. An HDMI interface ground filter circuit, characterized by, The HDMI interface chip J1 includes a pin 16; The pin 16 of the HDMI interface chip J1 is electrically connected to the anode of a diode D1, the cathode of the diode D1 is electrically connected to a first ground pin, the pin 16 of the HDMI interface chip J1 is electrically connected to the cathode of a diode D2, and the anode of the diode D2 is electrically connected to the output terminal VOUT of a power supply voltage stabilization circuit. The pin 15 of the HDMI interface chip J1 is electrically connected to the anode of a diode D3, the cathode of the diode D3 is electrically connected to a second ground pin, the pin 15 of the HDMI interface chip J1 is electrically connected to the cathode of a diode D4, and the anode of the diode D4 is electrically connected to the output terminal VOUT of the power supply voltage stabilization circuit.

2. The HDMI interface grounding filter circuit of claim 1, wherein, The pin 14 of the HDMI interface chip J1 is electrically connected to one end of a transient suppression protection diode D6, and the other end of the transient suppression protection diode D6 is electrically connected to a third ground pin.

3. The HDMI interface ground filtering circuit of claim 2, wherein, The pin 19 of the HDMI interface chip J1 is electrically connected to one end of a transient suppression protection diode D5, and the other end of the transient suppression protection diode D5 is electrically connected to the third ground pin.

4. The HDMI interface ground filtering circuit of claim 2, wherein, The pin 1, the pin 4, the pin 7, the pin 10 and the pin 13 of the HDMI interface chip J1 are all electrically connected to the third ground pin.

5. The HDMI interface ground filtering circuit of claim 2, wherein, The power supply voltage stabilization circuit includes an input terminal VIN, an output terminal VOUT, capacitors C1 and C2, and an inductor L1, wherein one end of the inductor L1 is electrically connected to the input terminal VIN, the input terminal VIN is connected to a 5v voltage, the other end of the inductor L1 is electrically connected to one end of the capacitor C1 and one end of the capacitor C2, the other end of the capacitor C1 is electrically connected to a fourth ground pin, the other end of the capacitor C2 is electrically connected to a fifth ground pin, and the output terminal VOUT is arranged on a line where the capacitor C1, the capacitor C2 and the inductor L1 are connected.

6. The HDMI interface ground filtering circuit of claim 5, wherein, The first ground pin, the second ground pin, the third ground pin, the fourth ground pin and the fifth ground pin are all electrically connected to a ground layer.

7. The HDMI interface ground filtering circuit of claim 5, wherein, The pin 18 of the HDMI interface chip J1 is electrically connected to the output terminal VOUT of the power supply voltage stabilization circuit.

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