CN201118817Y - Thermal plug interface circuit and TV with circuit - Google Patents
Thermal plug interface circuit and TV with circuit Download PDFInfo
- Publication number
- CN201118817Y CN201118817Y CNU200720304885XU CN200720304885U CN201118817Y CN 201118817 Y CN201118817 Y CN 201118817Y CN U200720304885X U CNU200720304885X U CN U200720304885XU CN 200720304885 U CN200720304885 U CN 200720304885U CN 201118817 Y CN201118817 Y CN 201118817Y
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- hot plug
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Abstract
The utility model discloses a hot plug interface circuit, which solves the problem that a source equipment can not rebuild the connection and certification with a receiving equipment when the current circuit switches the receiving equipment to the source equipment or enters into the operating state from the stand-by state; and the hot plug interface circuit comprises a hot plug detection end and a hot plug power supply end, the hot plug detection end is connected with the hot plug power supply end by a current-limiting resistor, and the hot plug circuit also includes a voltage pull-low circuit, the input end of the voltage pull-low circuit is connected with a hot plug signal end, and the output end thereof is connected with the hot plug detection end. The hot plug interface circuit is applied to HDMI interfaces of televisions, DVDs and set-top boxes.
Description
Technical field
The utility model relates to a kind of hot-plug interface circuit, relates in particular to a kind of HDMI hot-plug interface circuit that is used for television set.
Background technology
HDMI (High Definition Multimedia Interface HDMI (High Definition Multimedia Interface)) can transmit the HD video and the multichannel audio data of uncompressed high-qualityly; the maximum data transmission speed is 5Gbps; need not simultaneously to transmit advance capable D/A or mould/number conversion, can guarantee that the video-audio signal of first water transmits at signal.HDMI process on DVI (Digital Visual Interface digital visual interface) basis is improved, compare with DVI, HDMI has increased HDCP kernel (protection of High BandwidthDigital Content Protection broadband digital content), HDCP is mainly used in and prevents the HD digital signal by pirate, and two equipment must could be in transmitting signals through the HDCP authentication; Its function mode is, source device (computer, DVD etc.) and receiving equipment (television set, projector etc.) are when being connected by the HDMI terminal line, source device will send one group of HDCP authentication code to receiving equipment, receiving equipment is authenticated, have only through after confirming, source device just normally transmits signal.
In the existing HDMI interface, 19 pin are HPD (Hot Plug Detect), are used for supporting hot plug, and 18 pin link to each other with 19 pin HDP by inserting a resistance; After the HDMI line inserts, the source device 18 pin+5v=High that starts shooting, the state that can connect during 19 pin HPD=HIGH enters the process of HDCP authentication.But the sort circuit connected mode, when entering operating state when receiving equipment handover source equipment or by standby, because the source device power supply is in connection status always, 19 pin HPD are in the HIGH state all the time, and source device can not rebulid with receiving equipment and be connected and authenticate; Therefore, when entering operating state at receiving equipment handover source equipment or by standby, source device and receiving equipment can not keep synchronously, make the signal transmission abnormality occur.
The utility model content
The utility model provides a kind of hot-plug interface circuit, is when entering operating state at receiving equipment handover source equipment or by standby, source device and receiving equipment is rebulid be connected and authenticates.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
The utility model hot-plug interface circuit, comprise a hot plug test side and a hot plug feeder ear, described hot plug test side is connected with described hot plug feeder ear by a current-limiting resistance, described plug-and-play circuit comprises that also a voltage drags down circuit, the input that this voltage drags down circuit is connected with a hot plug signal end, and output is connected with described hot plug test side.
Wherein, described voltage drags down circuit and comprises a NPN type triode, and the collector electrode of NPN triode is connected with described hot plug test side, base stage is connected with described hot plug signal end, grounded emitter.
Be connected a filter circuit between the base stage of described NPN triode and the hot plug signal end.
Described filter circuit comprises electric capacity and voltage regulation resistance, and an end of this voltage regulation resistance is connected with the base stage of NPN triode, and the other end is connected with described hot plug signal end; One end of described electric capacity is connected between the base stage and voltage regulation resistance of NPN triode, other end ground connection.
Described hot plug signal end is connected with receiving equipment master chip control end.
The utility model hot-plug interface circuit, connect a voltage by hot plug test side and drag down circuit at existing HDMI plug-and-play circuit, when source device is connected on the receiving equipment for the first time, the hot plug feeder ear is changed to high level by current-limiting resistance with the hot plug test side, to finish the connection of hot plug; But after this, receiving equipment may no longer receive the signal of this terminal equipment; If the user need receive the signal of this source end equipment once more, promptly when receiving equipment enters operating state by standby, when perhaps switching to the signal source of this source end equipment of employing by other signal source in the course of the work, the input that voltage drags down circuit receives a signal from the hot plug signal end, voltage drags down circuit and the hot plug test side is dragged down from high level is low level, after a little time period, the blackout of hot plug signal end, thereby make the hot plug feeder ear hot plug test side is changed to high level once more by current-limiting resistance, rebulid connection status, again carry out the HDCP authentication, the assurance source device is synchronoused working with receiving equipment.
The utility model also provides a kind of television set with hot-plug interface circuit, when entering operating state at television set handover source equipment or by standby, source device and television set is rebulid be connected and authenticates.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
The utlity model has the television set of hot-plug interface circuit, described hot-plug interface circuit is arranged on the hot-plug interface of described television set, described hot-plug interface circuit comprises a hot plug test side and a hot plug feeder ear, described hot plug test side is connected with described hot plug feeder ear by a current-limiting resistance, it is characterized in that: described plug-and-play circuit comprises that also a voltage drags down circuit, the input that this voltage drags down circuit is connected with a hot plug signal end, and output is connected with described hot plug test side.
Wherein, described voltage drags down circuit and comprises a NPN type triode, and the collector electrode of NPN triode is connected with described hot plug test side, base stage is connected with described hot plug signal end, grounded emitter.
Be connected a filter circuit between the base stage of described NPN triode and the hot plug signal end.
Described filter circuit comprises electric capacity and voltage regulation resistance, and an end of this voltage regulation resistance is connected with the base stage of NPN triode, and the other end is connected with described hot plug signal end; One end of described electric capacity is connected between the base stage and voltage regulation resistance of NPN triode, other end ground connection.
Described hot plug signal end is connected with television set master chip control end.
The utility model hot-plug interface circuit, connect a voltage by hot plug test side and drag down circuit at existing HDMI plug-and-play circuit, when source device is connected on the television set for the first time, the hot plug feeder ear is changed to high level by current-limiting resistance with the hot plug test side, to finish the connection of hot plug; But after this, television set may no longer receive the signal of this source end equipment; If the user need receive the signal of this source end equipment once more, promptly when television set enters operating state by standby, when perhaps switching to the signal source that adopts this source device by other signal sources in the course of the work, voltage drags down circuit and receives a signal from the hot plug signal end, the hot plug test side dragged down from high level be low level, after a little time period, the blackout of hot plug signal end, thereby make the hot plug feeder ear hot plug test side is changed to high level once more by current-limiting resistance, rebulid connection status, again carry out the HDCP authentication, the assurance source device is synchronoused working with television set.
Description of drawings
Fig. 1 is the schematic diagram of the utility model hot-plug interface circuit embodiments.
Embodiment
In order to make those skilled in the art person understand the utility model scheme better, and above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, the utility model is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, the schematic diagram of the utility model hot-plug interface circuit embodiments.
The utility model hot-plug interface circuit, be arranged on the HDMI interface of television set, comprise hot plug test side W1, be connected with hot plug feeder ear W2 by a current-limiting resistance R1, hot plug test side W1 detects pin with the hot plug of HDMI interface and is connected, i.e. 19 pins, hot plug feeder ear W2 is connected with HDMI interface 18 pins; Hot plug test side W1 is used for hot plug and detects, and hot plug feeder ear W2 makes hot plug test side W1 be high level.Hot plug test side W1 is connected with the output that a voltage drags down circuit, and the input that voltage drags down circuit is connected with hot plug signal end W3 by a filter circuit, and filter circuit provides stable level signal for voltage drags down circuit; Hot plug feeder ear W2 is connected with power Vcc by an inductance L 1, and power Vcc provides stable voltage by inductance L 1 for hot plug feeder ear W2; Preferably, power supply is+5V voltage.
Wherein, described voltage drags down circuit and comprises a NPN type triode Q1, the collector electrode of NPN triode Q1 is connected with hot plug test side W1, base stage by filter circuit be connected with hot plug signal end W3, grounded emitter.
Wherein, described filter circuit comprises a capacitor C 1 and voltage regulation resistance R2, and the end of this voltage regulation resistance R2 is connected with the base stage of NPN triode, and the other end is connected with described hot plug signal end W3; One end of capacitor C 1 is connected between the base stage and voltage regulation resistance R2 of NPN triode Q1, other end ground connection.
After described HDMI interface line inserted, 19 pins were from source device input ARX-HOTPLUG signal, and 18 pins are from source device input AIN-5V signal, and the hot plug signal end is connected with television set master chip control port GPIO (general input/output terminal); After the source device operate as normal, 18 pin status are+5V, and 19 pin status are become+the 5V high level by 0 low level, and the state that connects enters the HDCP verification process; When entering operating state when the input of television set handover source or by standby, television set master chip control port GPIO sends a high level signal to the hot plug signal end, drag down circuit by voltage the signal of HDMI interface 19 pins is dragged down more than the 100ms, 19 pin status become low level by high level; Then, the hot plug feeder ear is changed to high level by current-limiting resistance once more with 19 pins, like this, restart source device and the television set state that connects, source device and television set carry out the HDCP verification process again one time, make and can finish new handshake procedure effectively, accurately between source device and the television set, synchronous again.
The above; it only is the preferable embodiment of the utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claim.
Claims (10)
1, a kind of hot-plug interface circuit, comprise a hot plug test side and a hot plug feeder ear, described hot plug test side is connected with described hot plug feeder ear by a current-limiting resistance, it is characterized in that: described plug-and-play circuit comprises that also a voltage drags down circuit, the input that this voltage drags down circuit is connected with a hot plug signal end, and output is connected with described hot plug test side.
2, hot-plug interface circuit according to claim 1, it is characterized in that: described voltage drags down circuit and comprises a NPN type triode, and the collector electrode of NPN triode is connected with described hot plug test side, base stage is connected with described hot plug signal end, grounded emitter.
3, hot-plug interface circuit according to claim 2 is characterized in that: be connected a filter circuit between the base stage of described NPN triode and the described hot plug signal end.
4, hot-plug interface circuit according to claim 3, it is characterized in that: described filter circuit comprises electric capacity and voltage regulation resistance, and this voltage regulation resistance one end is connected the base stage of NPN triode, and the other end is connected with described hot plug signal end; One end of described electric capacity is connected between the base stage and voltage regulation resistance of NPN triode, other end ground connection.
5, hot-plug interface circuit according to claim 1 is characterized in that: described hot plug signal end is connected with receiving equipment master chip control end.
6, a kind of television set with hot-plug interface circuit, described hot-plug interface circuit is arranged on the hot-plug interface of described television set, described hot-plug interface circuit comprises a hot plug test side and a hot plug feeder ear, described hot plug test side is connected with described hot plug feeder ear by a current-limiting resistance, it is characterized in that: described plug-and-play circuit comprises that also a voltage drags down circuit, the input that this voltage drags down circuit is connected with a hot plug signal end, and output is connected with described hot plug test side.
7, the television set with hot-plug interface circuit according to claim 6, it is characterized in that: described voltage drags down circuit and comprises a NPN type triode, and the collector electrode of NPN triode is connected with described hot plug test side, base stage is connected with described hot plug signal end, grounded emitter.
8, the television set with hot-plug interface circuit according to claim 7 is characterized in that: be connected a filter circuit between the base stage of described NPN triode and the described hot plug signal end.
9, the television set with hot-plug interface circuit according to claim 8, it is characterized in that: described filter circuit comprises electric capacity and voltage regulation resistance, this voltage regulation resistance one end is connected the base stage of NPN triode, and the other end is connected with described hot plug signal end; One end of described electric capacity is connected between the base stage and voltage regulation resistance of NPN triode, other end ground connection.
10, the television set with hot-plug interface circuit according to claim 6 is characterized in that: described hot plug signal end is connected with television set master chip control end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720304885XU CN201118817Y (en) | 2007-11-30 | 2007-11-30 | Thermal plug interface circuit and TV with circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720304885XU CN201118817Y (en) | 2007-11-30 | 2007-11-30 | Thermal plug interface circuit and TV with circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201118817Y true CN201118817Y (en) | 2008-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720304885XU Expired - Fee Related CN201118817Y (en) | 2007-11-30 | 2007-11-30 | Thermal plug interface circuit and TV with circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201118817Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101742356B (en) * | 2008-11-25 | 2012-07-18 | 联发科技股份有限公司 | Plug-in detecting method and related signal processing unit and electronic device |
| CN101729839B (en) * | 2008-10-14 | 2013-01-02 | 佳能株式会社 | Electric equipment with digital interface and method for controlling the same |
| CN103024435A (en) * | 2012-12-21 | 2013-04-03 | 深圳Tcl新技术有限公司 | HDMI (high-definition multimedia interface) interface detection device and method and HDMI interface system |
| CN103259999A (en) * | 2012-02-20 | 2013-08-21 | 联发科技（新加坡）私人有限公司 | Hot plug detection (HPD) signal output control method and high definition multimedia interface (HDMI) receiving end device and system |
| CN104704445A (en) * | 2012-09-25 | 2015-06-10 | Nec显示器解决方案株式会社 | Electronic device, communication system, and hot-plug control method |
| CN104731741A (en) * | 2013-12-23 | 2015-06-24 | 研祥智能科技股份有限公司 | Hot plugging implementing method and system |
| CN104967806A (en) * | 2015-07-28 | 2015-10-07 | 深圳市泰霖科技有限公司 | Switching circuit based on HDMI interface |
| CN109066627A (en) * | 2017-08-21 | 2018-12-21 | 福州福大海矽微电子有限公司 | Have the protection circuit for hot plug detection port of HPD and ESD concurrently |
| US10176140B2 (en) | 2012-09-25 | 2019-01-08 | Nec Display Solutions, Ltd. | HDMI apparatus of high-definition TV has switching circuit that outputs low-level/ground potential to second pin of HDMI connector if a first signal is not outputted |
-
2007
- 2007-11-30 CN CNU200720304885XU patent/CN201118817Y/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101729839B (en) * | 2008-10-14 | 2013-01-02 | 佳能株式会社 | Electric equipment with digital interface and method for controlling the same |
| CN101742356B (en) * | 2008-11-25 | 2012-07-18 | 联发科技股份有限公司 | Plug-in detecting method and related signal processing unit and electronic device |
| CN103259999A (en) * | 2012-02-20 | 2013-08-21 | 联发科技（新加坡）私人有限公司 | Hot plug detection (HPD) signal output control method and high definition multimedia interface (HDMI) receiving end device and system |
| CN104704445B (en) * | 2012-09-25 | 2018-11-09 | Nec显示器解决方案株式会社 | Electronic device, communication system and hot-swappable control method |
| CN104704445A (en) * | 2012-09-25 | 2015-06-10 | Nec显示器解决方案株式会社 | Electronic device, communication system, and hot-plug control method |
| US10176140B2 (en) | 2012-09-25 | 2019-01-08 | Nec Display Solutions, Ltd. | HDMI apparatus of high-definition TV has switching circuit that outputs low-level/ground potential to second pin of HDMI connector if a first signal is not outputted |
| CN103024435B (en) * | 2012-12-21 | 2015-09-30 | 深圳Tcl新技术有限公司 | HDMI checkout gear, detection method and HDMI system |
| CN103024435A (en) * | 2012-12-21 | 2013-04-03 | 深圳Tcl新技术有限公司 | HDMI (high-definition multimedia interface) interface detection device and method and HDMI interface system |
| CN104731741A (en) * | 2013-12-23 | 2015-06-24 | 研祥智能科技股份有限公司 | Hot plugging implementing method and system |
| CN104731741B (en) * | 2013-12-23 | 2019-03-19 | 研祥智能科技股份有限公司 | The method and system of hot plug |
| CN104967806A (en) * | 2015-07-28 | 2015-10-07 | 深圳市泰霖科技有限公司 | Switching circuit based on HDMI interface |
| CN104967806B (en) * | 2015-07-28 | 2018-03-16 | 深圳市泰霖科技有限公司 | Switching circuit based on HDMI |
| CN109066627A (en) * | 2017-08-21 | 2018-12-21 | 福州福大海矽微电子有限公司 | Have the protection circuit for hot plug detection port of HPD and ESD concurrently |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080917 Termination date: 20111130 |