CN210444010U - Circuit for protecting hot plug detection pin of high-definition multimedia interface - Google Patents
Circuit for protecting hot plug detection pin of high-definition multimedia interface Download PDFInfo
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- CN210444010U CN210444010U CN201920748154.7U CN201920748154U CN210444010U CN 210444010 U CN210444010 U CN 210444010U CN 201920748154 U CN201920748154 U CN 201920748154U CN 210444010 U CN210444010 U CN 210444010U
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Abstract
The utility model discloses a circuit for protecting hot plug detection pin of high-definition multimedia interface, which is applied to a patch panel, wherein the patch panel comprises a chip, and the chip comprises an interface; the circuit for protecting the hot plug detection pin of the high-definition multimedia interface comprises: a current limiting circuit; the current limiting circuit is respectively connected with the interface of the chip and the hot plug detection pin in a preset connection mode; the preset connection mode comprises a connection mode which is connected between an interface of the chip and the hot plug detection pin in series. The protection that adopts current-limiting circuit to improve the hot plug of high definition multimedia interface on the adapter plate and detect the pin is inserted to this application, and the circuit is simple and practical, realizes very easily, can the wide application, has with low costs, the practicality is strong.
Description
Technical Field
The utility model relates to a high definition multimedia interface field especially relates to a circuit of detection pin is inserted to hot drawing of protection high definition multimedia interface.
Background
Hdmi (high Definition Multimedia interface), i.e. high Definition Multimedia interface, is a digital video/audio interface technology, is a special digital interface suitable for image transmission, can simultaneously transmit audio and video signals, and is currently widely used in various display occasions.
Hot Plug Detect (i.e. Hot Plug Detect, HPD for short) in HDMI interface. The pin is used to determine whether the device is present for subsequent operation. In the using process, hot plugging is frequently carried out, abnormal instantaneous current and voltage drop are generated in the hot plugging process, and an IO port connected with the HPD pin of the HDMI interface is sensitive to voltage and current, so that the HPD pin is easily broken in the using process, and the device is damaged and cannot normally work.
In the design of the conventional OPS adapter plate, an ESD (Electro-Static discharge) device is optionally added to an HPD pin of the HDMI, but the HPD pin is directly connected to a detection IO port of a chip. Because the ESD device can be conducted to work only under the condition of large electrostatic voltage (hundreds of volts), the voltage is limited in a safe range, when abnormal instantaneous current and voltage drop generated by hot plugging are relatively small, the ESD device cannot work, and because the HPD pin and the detection IO port of the chip are in direct connection, the chip is easy to damage in the using process, and unnecessary loss is caused.
SUMMERY OF THE UTILITY MODEL
The application provides a circuit for protecting hot plug detection pin of high-definition multimedia interface, which can solve the technical problem that when abnormal instantaneous current and voltage drop generated by hot plug in the prior art are relatively small, an ESD device cannot work, and a chip is damaged.
The utility model provides a circuit for protecting hot plug detection pin of high definition multimedia interface, the high definition multimedia interface is applied on a keyset, the keyset contains a chip, the chip contains an interface; the circuit for protecting the hot plug detection pin of the high-definition multimedia interface comprises: a current limiting circuit;
the current limiting circuit is respectively connected with the interface of the chip and the hot plug detection pin in a preset connection mode; the preset connection mode comprises a connection mode which is connected between an interface of the chip and the hot plug detection pin in series.
Optionally, the current limiting circuit includes a protection resistor.
Optionally, the protection resistor may be an adjustable resistor.
Optionally, the protection resistor is a fixed resistor.
Optionally, the protection resistor has a resistance value ranging from 6K Ω to 15K Ω.
Optionally, the resistance of the protection resistor is preferably 10K Ω.
Optionally, the high definition multimedia interface includes an upper conductive terminal row and a lower conductive terminal row.
Optionally, the high definition multimedia interface comprises 19 conducting pins.
Optionally, the hot plug detection pin of the high definition multimedia interface is pin No. 19.
Optionally, the interface of the chip is an input/output interface of the chip.
The utility model provides a pair of protection high definition multimedia interface's hot plug detects circuit of pin adopts the current limiting circuit, can improve to the fishplate bar high definition multimedia interface's hot plug detects the protection of pin, and the circuit is simple and practical, realizes getting up very easily, can the wide application, has with low costs, the practicality is strong, the current limiting circuit.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a connection configuration diagram of a circuit for protecting a hot-plug detection pin of a high-definition multimedia interface according to an embodiment of the present application;
fig. 2 is a pin configuration diagram of a high definition multimedia interface in an embodiment of the present application.
Detailed Description
To make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention are clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
Because the abnormal instantaneous current and voltage drop generated by hot plug in the prior art are relatively small, the ESD device can not work, and the technical problem of chip damage is caused.
Referring to fig. 1, fig. 1 is a connection structure diagram of a circuit for protecting a hot-plug detection pin of a high-definition multimedia interface according to an embodiment of the present application;
the utility model provides a circuit for protecting hot plug detection pin of high-definition multimedia interface, the high-definition multimedia interface is applied on a keyset, the keyset comprises a chip, the chip comprises an interface; the circuit for protecting the hot plug detection pin of the high-definition multimedia interface comprises: a current limiting circuit 13;
the circuit 10 for protecting the hot plug detection pin 11 of the high definition multimedia interface comprises a current limiting protection circuit 13, and the current limiting protection circuit 13 comprises:
the current limiting circuit 13 is respectively connected with the interface 12 of the chip and the hot plug detection pin 11 in a preset connection mode; the preset connection mode comprises that the preset connection mode is connected between an interface 12 of the chip and a hot plug detection pin 11 in series
Further, in the present embodiment, the current limiting circuit 13 includes a protection resistor.
In this embodiment, the current limiting circuit 13 may be: the current limiting circuit 13 is formed by connecting one or more resistors in series, and the present embodiment is not limited to the number of resistors.
In this embodiment, the current limiting circuit 13 may further include: the current limiting circuit 13 is formed by connecting more than one resistor in parallel, and the present embodiment is not limited to the number of resistors.
Further, in the present embodiment, the current limiting circuit 13 may further include a capacitor, an inductor, and the like.
Further, in this embodiment, the protection resistor may be an adjustable resistor.
Further, in the present embodiment, the protection resistor may be a fixed resistor.
Further, in the present embodiment, the protection resistor has a resistance value ranging from 6K Ω to 15K Ω.
Further, in the present embodiment, the resistance value of the protection resistor is preferably 10K Ω.
FIG. 2 is a pin configuration diagram of a high definition multimedia interface in an embodiment of the present application; as shown in fig. 2, the high definition multimedia interface includes 19 conductive pins;
further, the high definition multimedia interface comprises an upper conductive terminal row and a lower conductive terminal row, wherein the upper conductive terminal row comprises: 2. pin numbers 4, 6, 8, 10, 12, 14, 16, 18, the lower conductive terminal row comprises: 1. pin nos. 3, 5, 7, 9, 11, 13, 15, 17, 19.
Furthermore, in the embodiment, the hot plug detection pin of the high definition multimedia interface is pin No. 19.
In this embodiment, the interface of the chip is an input/output interface of the chip.
The utility model provides a pair of protection high definition multimedia interface's hot plug detects circuit of pin 11 adopts current-limiting circuit 13 to improve the hot plug that goes up high definition multimedia interface on the adapter plate and inserts the protection that detects pin 11 to the mode of series resistance is connected the input/delivery outlet that hot plug detected pin 11 and chip, and this current-limiting protection circuit is simple and practical, realizes getting up very easily, can the wide application, has with low costs, the practicality is strong, current-limiting circuit.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It is right above the utility model provides a protect the circuit of hot plug inspection pin of high definition multimedia interface's description, to technical personnel in the field, the foundation the utility model discloses the thought of embodiment all has the change part on concrete implementation and application scope, to sum up, this specification content should not be understood as right the utility model discloses a restriction.
Claims (8)
1. A circuit for protecting a hot plug detection pin of a high-definition multimedia interface is provided, wherein the high-definition multimedia interface is applied to a patch panel, the patch panel comprises a chip, and the chip comprises an interface; the circuit for protecting the hot plug detection pin of the high-definition multimedia interface is characterized by comprising: a current limiting circuit;
the current limiting circuit is respectively connected with the interface of the chip and the hot plug detection pin in a preset connection mode; the preset connection mode comprises the connection between an interface of the chip and the hot plug detection pin in series;
the current limiting circuit comprises more than one protective resistor, and the current limiting circuit is formed by connecting more than one protective resistors in series.
2. The circuit for protecting hot-plug detection pins of a high-definition multimedia interface as claimed in claim 1, wherein said protection resistor is an adjustable resistor.
3. The circuit for protecting hot-plug detection pins of a high-definition multimedia interface as claimed in claim 1, wherein said protection resistor is a fixed resistor.
4. The circuit for protecting hot-plug detection pins of a high-definition multimedia interface as claimed in claim 1, wherein the protection resistor has a resistance value ranging from 6K Ω to 15K Ω.
5. The circuit for protecting hot-plug detection pins of a high-definition multimedia interface as claimed in claim 4, wherein the preferred resistance of the protection resistor is 10K Ω.
6. The circuit for protecting hot-plug detection pins of a high-definition multimedia interface of claim 1, wherein the high-definition multimedia interface comprises an upper conductive terminal row and a lower conductive terminal row.
7. The circuit for protecting hot plug detect pin of high definition multimedia interface as claimed in claim 1, wherein the hot plug detect pin of high definition multimedia interface is 19 pins.
8. The circuit for protecting hot-plug detection pins of a high-definition multimedia interface as claimed in claim 1, wherein the interface is an input/output interface of a chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920748154.7U CN210444010U (en) | 2019-05-23 | 2019-05-23 | Circuit for protecting hot plug detection pin of high-definition multimedia interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920748154.7U CN210444010U (en) | 2019-05-23 | 2019-05-23 | Circuit for protecting hot plug detection pin of high-definition multimedia interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210444010U true CN210444010U (en) | 2020-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920748154.7U Active CN210444010U (en) | 2019-05-23 | 2019-05-23 | Circuit for protecting hot plug detection pin of high-definition multimedia interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210444010U (en) |
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2019
- 2019-05-23 CN CN201920748154.7U patent/CN210444010U/en active Active
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