WO2017101307A1 - 一种hdmi识别端口的保护电路及设备 - Google Patents

一种hdmi识别端口的保护电路及设备 Download PDF

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WO2017101307A1
WO2017101307A1 PCT/CN2016/088429 CN2016088429W WO2017101307A1 WO 2017101307 A1 WO2017101307 A1 WO 2017101307A1 CN 2016088429 W CN2016088429 W CN 2016088429W WO 2017101307 A1 WO2017101307 A1 WO 2017101307A1
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hdmi
switch circuit
resistor
voltage
circuit
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PCT/CN2016/088429
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English (en)
French (fr)
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段炜
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乐视控股（北京）有限公司
乐视致新电子科技（天津）有限公司
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Priority to US15/250,542 priority Critical patent/US20170170651A1/en
Publication of WO2017101307A1 publication Critical patent/WO2017101307A1/zh

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  • the present application relates to the field of HDMI technologies, and in particular, to a protection circuit and device for an HDMI identification port.
  • High Definition Multimedia Interface is a digital video/audio interface technology. It is a dedicated digital interface suitable for image transmission. It can transmit audio and video signals at the same time. The maximum data transmission speed is 4.5GB/ s.
  • HDMI does not require digital/analog or analog-to-digital conversion before signal transmission, and can be used with Wideband Digital Content Protection (HDCP) to prevent unauthorized copying of copyrighted audio and video content. Therefore, HDMI has been more and more widely used in various electronic devices.
  • Electronic devices such as televisions usually detect whether the HDMI power port (Pin 18) has an identification voltage (5V) through the HDMI identification port (idental pin), and then determine whether the electronic device has an external signal source.
  • the device can display image content only when the signal source is external to the electronic device and the signal is present.
  • the inventors have found that at least the following problems exist in the prior art: since the HDMI signal source provided by the place of use such as the home appliance store is not standardized, the voltage of many signal sources is higher than the standard identification voltage (5V), thereby It is easy to burn out the chip in the electronic device that is connected to the identification port. Moreover, the existing protection circuit for the HDMI identification port is mostly an ESD electrostatic protection circuit, which cannot provide protection for an excessive DC voltage.
  • the embodiment of the present application provides a protection circuit and device for an HDMI identification port, which protects an HDMI identification port from overvoltage protection by a protection circuit, thereby avoiding equipment damage caused by excessive HDMI signal source voltage and reducing after-sales cost.
  • the embodiment of the present application provides a protection circuit for an HDMI identification port, where the protection circuit includes: a first switching circuit and a second switching circuit,
  • One end of the first switch circuit is connected to the HDMI power port, and the other end is connected to the second switch circuit;
  • One end of the second switch circuit is connected to the first switch circuit, and the other end is connected to the HDMI identification port;
  • the first switch circuit isolates a voltage applied by the HDMI power port, and drives the second switch circuit to be turned on, and uses a standby voltage as an identification voltage of the HDMI identification port.
  • the first switch circuit includes: a switch transistor, a base of the switch transistor is connected to the HDMI power port, an emitter of the switch transistor is connected to a ground voltage, and the switch transistor is The collector connects the standby voltage.
  • the first switch circuit further includes: a first resistor, a first end of the first resistor is connected to a base of the switch transistor, and a second end is connected to a ground voltage.
  • the first switch circuit further includes: a second resistor, a first end of the second resistor is connected to a base of the switch transistor, and a second end is respectively connected to the HDMI power port And a first end of the first resistor.
  • the first switch circuit further includes: a third resistor, a first end of the third resistor is connected to a ground voltage, and a second end is connected to the collector of the switch transistor and the first Two switching circuits.
  • the second switch circuit includes: a field effect transistor, a gate of the FET is respectively connected to the first switch circuit and the standby voltage, and a drain is connected to the standby voltage And the gate, the source is connected to the HDMI identification port.
  • the second switch circuit further includes: a fourth resistor, the first end of the fourth resistor is connected to the first switch circuit, and the second end is respectively connected to the FET Gate and ground voltage.
  • the second switch circuit further includes: a fifth resistor, the first end of the fifth resistor is connected to the ground voltage, and the second end is respectively connected to the gate and the gate of the FET The second end of the fourth resistor.
  • An embodiment of the present application provides a device with an HDMI identification port, where the HDMI identification port is connected to the protection circuit.
  • the protection circuit of the present application will have a first switching circuit and a second switching circuit. Connected between the HDMI power port and the HDMI recognition port.
  • the first switch circuit isolates the voltage applied by the HDMI power port, and drives the second switch circuit to be turned on, and uses the standby voltage as the identification voltage of the HDMI identification port. Therefore, the protection circuit of the present application protects the HDMI identification port from overvoltage, thereby avoiding equipment damage caused by excessive HDMI signal source voltage and reducing after-sales cost.
  • 1 is a circuit diagram of a protection circuit of an HDMI identification port of the present application.
  • the protection circuit of the embodiment of the present application connects the first switch circuit and the second switch circuit between the HDMI power port and the HDMI identification port.
  • the first switch circuit isolates the voltage applied by the HDMI power port, and drives the second switch circuit to be turned on, and uses the standby voltage as the identification voltage of the HDMI identification port. Therefore, the protection circuit of the present application protects the HDMI identification port from overvoltage, thereby avoiding equipment damage caused by excessive HDMI signal source voltage and reducing after-sales cost.
  • an embodiment of the present application provides a protection circuit for an HDMI identification port, where the protection circuit includes: a first switch circuit 11 and a second switch circuit 12 .
  • One end of the first switch circuit 11 is connected to the HDMI power port 13 and the other end is connected to the second switch circuit 12.
  • One end of the second switch circuit 12 is connected to the first switch circuit 11 and the other end is connected to the HDMI identification port 14.
  • the first switch circuit 11 isolates the voltage applied by the HDMI power port 13 and drives the second switch circuit 12 to be turned on, and uses the standby voltage as the identification voltage of the HDMI identification port 14.
  • the chip connected to the HDMI identification port 14 is not damaged, and the standby voltage (5V) is loaded to ensure that the HDMI identification port 14 recognizes whether to receive. To the signal source.
  • a first switching circuit 11 includes a switching transistor T, a base of the switching transistor T is connected to the HDMI power port 13, and an emitter of the switching transistor T Connected to the ground voltage, the collector of the switching transistor T is connected to the standby voltage (5V).
  • the first switch circuit 11 further includes: a first resistor R1, the first end of the first resistor R1 is connected to the base of the switch transistor T, and the second end is connected to the ground in order to prevent the suspension voltage from causing the triode T to malfunction. Voltage.
  • the first switch circuit 11 further includes: a second resistor R2, a first end of the second resistor R2 is connected to a base of the switch transistor T, and a second end is respectively connected to the HDMI power port 13 and the first a first end of the resistor R1.
  • the second resistor R2 acts as a pull-down resistor to ensure the stability of the operation of the transistor T.
  • the first switch circuit 11 further includes a third resistor R3.
  • the first end of the third resistor R3 is connected to the ground voltage, and the second end is connected to the collector of the switching transistor T and the second switch circuit 12.
  • the third resistor R3 acts as a bias resistor, and current limiting provides a suitable current to the collector of the transistor T.
  • the second switch circuit 12 includes: a field effect transistor MOS, a gate of the field effect transistor MOS is respectively connected to the first switch circuit 11 and the standby voltage (5V), and a drain is connected to the standby voltage (5V) And the gate, the source is connected to the HDMI identification port 14.
  • the second switch circuit 12 further includes: a fourth resistor R4, the first end of the fourth resistor R4 is connected to the first switch circuit 11, and the second end is respectively connected to the The gate and ground voltage of the FET MOS.
  • the second switch circuit 12 further includes: a fifth resistor R5, the first end of the fifth resistor R5 is connected to the ground voltage, and the second end is respectively connected to the FET a second end of the gate and the fourth resistor R4.
  • the present application further provides a device having an HDMI identification port, and the HDMI identification port of the device is connected to any one of the above protection circuits.

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Abstract

一种HDMI识别端口的保护电路及设备，保护电路包括：第一开关电路(11)和第二开关电路(12)，第一开关电路的一端连接HDMI电源端口(13)，另一端连接第二开关电路；第二开关电路的一端连接第一开关电路，另一端连接HDMI识别端口(14)；第一开关电路对HDMI电源端口加载的电压进行隔离，并驱动第二开关电路导通，将待机电压作为HDMI识别端口的识别电压。通过保护电路对HDMI识别端口进行过压保护，避免了HDMI信号源电压过高造成的设备损坏，降低了售后成本。

Description

一种HDMI识别端口的保护电路及设备
本申请要求于2015年12月15日提交中国专利局、申请号为201521054659.1，发明名称为“一种HDMI识别端口的保护电路及设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及HDMI技术领域，尤其涉及一种HDMI识别端口的保护电路及设备。
背景技术
高清晰度多媒体接口(High Definition Multimedia Interface，HDMI)是一种数字化视频/音频接口技术，是适合影像传输的专用型数字化接口，其可同时传送音频和影像信号，最高数据传输速度为4.5GB/s。同时，HDMI无需在信号传送前进行数/模或者模/数转换，可搭配宽带数字内容保护(HDCP)，以防止具有著作权的影音内容遭到未经授权的复制。因此，HDMI已经越来越广泛的应用于各种电子设备中。
电视等电子设备通常通过HDMI识别端口(ident Pin)检测HDMI的电源端口(Pin 18)是否存在识别电压(5V)，进而判断电子设备是否外接有信号源。只有电子设备外接有信号源，并且信号存在时，该设备才能显示图像内容。
在实现本申请过程中，发明人发现现有技术中至少存在如下问题：由于家电卖场等使用场所提供的HDMI信号源并不规范，很多信号源的电压高出规范识别电压(5V)很多，从而容易烧坏电子设备中与识别端口连接的芯片。并且，现有的对HDMI识别端口的保护电路大部分是ESD静电保护电路，对于过高的直流电压则无法提供保护。
因此，如何对识别端口进行过压保护，成为现有技术中亟需解决的技术问题。
实用新型内容
有鉴于此，本申请实施例提供一种HDMI识别端口的保护电路及设备，其通过保护电路对HDMI识别端口进行过压保护，避免了HDMI信号源电压过高造成的设备损坏，降低了售后成本。
本申请实施例提供一种HDMI识别端口的保护电路，所述保护电路包括： 第一开关电路和第二开关电路，
所述第一开关电路的一端连接HDMI电源端口，另一端连接所述第二开关电路；
所述第二开关电路的一端连接所述第一开关电路，另一端连接所述HDMI识别端口；
所述第一开关电路对所述HDMI电源端口加载的电压进行隔离，并驱动所述第二开关电路导通，将待机电压作为所述HDMI识别端口的识别电压。
在本申请一具体实施例中，所述第一开关电路包括：开关三极管，所述开关三极管的基极连接所述HDMI电源端口，所述开关三极管的发射极连接地电压，所述开关三极管的集电极连接所述待机电压。
在本申请一具体实施例中，所述第一开关电路还包括：第一电阻，所述第一电阻的第一端连接所述开关三极管的基极，第二端连接地电压。
在本申请一具体实施例中，所述第一开关电路还包括：第二电阻，所述第二电阻的第一端连接所述开关三极管的基极，第二端分别连接所述HDMI电源端口和所述第一电阻的第一端。
在本申请一具体实施例中，所述第一开关电路还包括：第三电阻，所述第三电阻的第一端连接地电压，第二端连接所述开关三极管的集电极和所述第二开关电路。
在本申请一具体实施例中，所述第二开关电路包括：场效应管，所述场效应管的栅极分别连接所述第一开关电路和所述待机电压，漏极连接所述待机电压和所述栅极，源极连接所述HDMI识别端口。
在本申请一具体实施例中，所述第二开关电路还包括：第四电阻，所述第四电阻的第一端连接所述第一开关电路，第二端分别连接所述场效应管的栅极和地电压。
在本申请一具体实施例中，所述第二开关电路还包括：第五电阻，所述第五电阻的第一端连接地电压，第二端分别连接所述场效应管的栅极和所述第四电阻的第二端。
本申请实施例提供一种具有HDMI识别端口的设备，所述HDMI识别端口连接上述的保护电路。
由以上技术方案可见，本申请保护电路将第一开关电路和第二开关电路 连接在HDMI电源端口和HDMI识别端口之间。第一开关电路对HDMI电源端口加载的电压进行隔离，并驱动所述第二开关电路导通，将待机电压作为HDMI识别端口的识别电压。因此，本申请保护电路对HDMI识别端口进行了过压保护，避免了HDMI信号源电压过高造成的设备损坏，降低了售后成本。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请中记载的一些实施例，对于本领域普通技术人员来讲，还可以根据这些附图获得其他的附图。
图1是本申请HDMI识别端口的保护电路的电路图。
具体实施方式
本申请实施例保护电路将第一开关电路和第二开关电路连接在HDMI电源端口和HDMI识别端口之间。第一开关电路对HDMI电源端口加载的电压进行隔离，并驱动所述第二开关电路导通，将待机电压作为HDMI识别端口的识别电压。因此，本申请保护电路对HDMI识别端口进行了过压保护，避免了HDMI信号源电压过高造成的设备损坏，降低了售后成本。
当然，实施本申请的任一技术方案必不一定需要同时达到以上的所有优点。
为了使本领域的人员更好地理解本申请中的技术方案，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员所获得的所有其他实施例，都应当属于本申请保护的范围。
下面结合本申请附图说明本申请具体实现。
参见图1，本申请一具体实施例提供一种HDMI识别端口的保护电路，所述保护电路包括：第一开关电路11和第二开关电路12。
所述第一开关电路11的一端连接HDMI电源端口13，另一端连接所述第二开关电路12。
所述第二开关电路12的一端连接所述第一开关电路11，另一端连接所述HDMI识别端口14。
所述第一开关电路11对所述HDMI电源端口13加载的电压进行隔离，并驱动所述第二开关电路12导通，将待机电压作为所述HDMI识别端口14的识别电压。
因此，当所述HDMI电源端口13加载的电压过高时，不会造成所述HDMI识别端口14所连接芯片的损坏，同时加载的待机电压(5V)，确保所述HDMI识别端口14识别是否接收到信号源。
参看图1，在本申请另一具体实施例所述的第一开关电路11包括：开关三极管T，所述开关三极管T的基极连接所述HDMI电源端口13，所述开关三极管T的发射极连接地电压，所述开关三极管T的集电极连接所述待机电压(5V)。
为了防止悬浮电压引起三极管T误动作，所述第一开关电路11还包括：第一电阻R1，所述第一电阻R1的第一端连接所述开关三极管T的基极，第二端连接地电压。
所述第一开关电路11还包括：第二电阻R2，所述第二电阻R2的第一端连接所述开关三极管T的基极，第二端分别连接所述HDMI电源端口13和所述第一电阻R1的第一端。所述第二电阻R2作为下拉电阻，保证三极管T工作的稳定性。
所述第一开关电路11还包括：第三电阻R3，所述第三电阻R3的第一端连接地电压，第二端连接所述开关三极管T的集电极和所述第二开关电路12。第三电阻R3作为偏置电阻，限流提供合适电流至所述三极管T的集电极。
所述第二开关电路12包括：场效应管MOS，所述场效应管MOS的栅极分别连接所述第一开关电路11和所述待机电压(5V)，漏极连接所述待机电压(5V)和所述栅极，源极连接所述HDMI识别端口14。
为了保护所述场效应管MOS，所述第二开关电路12还包括：第四电阻R4，所述第四电阻R4的第一端连接所述第一开关电路11，第二端分别连接所述场效应管MOS的栅极和地电压。
为了保护所述场效应管MOS，所述第二开关电路12还包括：第五电阻R5，所述第五电阻R5的第一端连接地电压，第二端分别连接所述场效应管MOS的栅极和所述第四电阻R4的第二端。
对应于上述HDMI识别端口的保护电路，本申请还提供一种具有HDMI识别端口的设备，所述设备的HDMI识别端口连接上述任一种保护电路。
尽管已描述了本申请的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (9)

  1. 一种HDMI识别端口的保护电路，其特征在于，所述保护电路包括：第一开关电路和第二开关电路，
    所述第一开关电路的一端连接HDMI电源端口，另一端连接所述第二开关电路；
    所述第二开关电路的一端连接所述第一开关电路，另一端连接所述HDMI识别端口；
    所述第一开关电路对所述HDMI电源端口加载的电压进行隔离，并驱动所述第二开关电路导通，将待机电压作为所述HDMI识别端口的识别电压。
  2. 根据权利要求1所述的保护电路，其特征在于，所述第一开关电路包括：开关三极管，所述开关三极管的基极连接所述HDMI电源端口，所述开关三极管的发射极连接地电压，所述开关三极管的集电极连接所述待机电压。
  3. 根据权利要求2所述的保护电路，其特征在于，所述第一开关电路还包括：第一电阻，所述第一电阻的第一端连接所述开关三极管的基极，第二端连接地电压。
  4. 根据权利要求3所述的保护电路，其特征在于，所述第一开关电路还包括：第二电阻，所述第二电阻的第一端连接所述开关三极管的基极，第二端分别连接所述HDMI电源端口和所述第一电阻的第一端。
  5. 根据权利要求4所述的保护电路，其特征在于，所述第一开关电路还包括：第三电阻，所述第三电阻的第一端连接地电压，第二端连接所述开关三极管的集电极和所述第二开关电路。
  6. 根据权利要求1-5任一项所述的保护电路，其特征在于，所述第二开关电路包括：场效应管，所述场效应管的栅极分别连接所述第一开关电路和所述待机电压，漏极连接所述待机电压和所述栅极，源极连接所述HDMI识别端口。
  7. 根据权利要求6所述的保护电路，其特征在于，所述第二开关电路还包括：第四电阻，所述第四电阻的第一端连接所述第一开关电路，第二端分别连接所述场效应管的栅极和地电压。
  8. 根据权利要求7所述的保护电路，其特征在于，所述第二开关电路还包括：第五电阻，所述第五电阻的第一端连接地电压，第二端分别连接所述 场效应管的栅极和所述第四电阻的第二端。
  9. 一种具有HDMI识别端口的设备，其特征在于，所述HDMI识别端口连接所述权利要求1-8中任一项所述的保护电路。
PCT/CN2016/088429 2015-12-15 2016-07-04 一种hdmi识别端口的保护电路及设备 WO2017101307A1 (zh)

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Citations (3)

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US20100128178A1 (en) * 2008-11-25 2010-05-27 Samsung Electronics Co. Ltd. Apparatus and method for supporting hot plug detect function in portable terminal using high definition multimedia interface
CN203135390U (zh) * 2012-12-26 2013-08-14 西安Tcl软件开发有限公司 过流保护电路及电子设备
CN204559104U (zh) * 2015-04-29 2015-08-12 浪潮软件集团有限公司 一种低成本的hdmi接口供电保护电路

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100128178A1 (en) * 2008-11-25 2010-05-27 Samsung Electronics Co. Ltd. Apparatus and method for supporting hot plug detect function in portable terminal using high definition multimedia interface
CN203135390U (zh) * 2012-12-26 2013-08-14 西安Tcl软件开发有限公司 过流保护电路及电子设备
CN204559104U (zh) * 2015-04-29 2015-08-12 浪潮软件集团有限公司 一种低成本的hdmi接口供电保护电路

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