A circuit, method and device for preventing current backflow for video interface
A video interface and anti-backflow technology, which is applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problem that the minimum power supply voltage of the video interface of the display device cannot be met, and achieve the effect of protecting the overall circuit
Active Publication Date: 2022-06-07
东莞市海能电子有限公司
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Problems solved by technology
[0006] In order to improve the defect that it has the function of preventing current backflow but may not be able to meet the minimum power supply voltage of the video interface of the display device, the application provides a circuit, method and device for preventing current backflow of the video interface
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[0069] The following is combined with the attached Figure 1-4 Further elaboration of this application.
[0070] Embodiments of the present application disclose a circuit for preventing current reversal of the video interface.
[0071] Reference Figure 1 , the circuit for the video interface to prevent current reversal circuit comprising a power supply module 2, power supply module 2 and temperature detection module 6, circuit protection module 3 and control module 1 electrical connection, power supply module 2 can be temperature detection module 6, circuit protection module 3 and control module 1 power supply. Control module 1 for electrical connection with the first external device 4, and detect the access state of the first external device 4, if the first external device 4 is successfully connected and the power supply module 2 is supplying power to the circuit protection module 3, the circuit protection module 3 switches to the positive on state, so that the power supply module 2...
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This application discloses a circuit, method and device for preventing current backflow for video interfaces, which relate to the technical field of current backflow prevention. The circuit includes: a control module, used to detect and judge whether the first external device is connected; if so, Then the control module outputs the first control signal; if not, the control module outputs the second control signal; the power supply module outputs electric energy to the control module; the circuit protection module switches to the forward conduction state when receiving the first control signal, so that The power supply module outputs a conduction voltage to the second external device, the conduction voltage is not less than the lowest power supply voltage of the video interface on the second external device, and switches to the anti-backflow state when receiving the second control signal to prevent the current of the second external device from flowing backward . The application has the advantages of preventing current backflow and having a very low voltage drop.
Description
Technical field [0001] The present application relates to the field of current-proof reverse flow technology, in particular to a circuit for preventing current reversal of a video interface, a method and apparatus. Background [0002] The existing video interface includes HDMI interface, DVI interface and VGA interface, and the notebook computer generally only has 1 to 2 types of video interface, so the type of video interface of the notebook computer can be expanded by the docking station, so that the notebook computer can be adapted to a variety of different video interface display devices. [0003] When the notebook computer is connected to the display device through the docking station, the docking station will read the EDID of the display device through the circuit common to the HDMI, DVI, VGA interface, wherein the EDID is an electronic tag used by the display device to describe its own display capability and audio output capability, the data reading of the EDID is achieved...
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IPC IPC(8): H02H3/10H02H3/24H02H5/04
CPCH02H3/10H02H3/243H02H5/04
Inventor 何杰严武
Owner 东莞市海能电子有限公司