WO2018086221A1 - Circuit d'interface hdmi pour dispositif maître, et procédé pour fournir de l'énergie à un dispositif esclave sur la base d'une interface hdmi - Google Patents

Circuit d'interface hdmi pour dispositif maître, et procédé pour fournir de l'énergie à un dispositif esclave sur la base d'une interface hdmi Download PDF

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Publication number
WO2018086221A1
WO2018086221A1 PCT/CN2016/112830 CN2016112830W WO2018086221A1 WO 2018086221 A1 WO2018086221 A1 WO 2018086221A1 CN 2016112830 W CN2016112830 W CN 2016112830W WO 2018086221 A1 WO2018086221 A1 WO 2018086221A1
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WIPO (PCT)
Prior art keywords
resistor
hdmi interface
capacitor
slave device
master device
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Application number
PCT/CN2016/112830
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English (en)
Chinese (zh)
Inventor
吴有肇
Original Assignee
深圳Tcl数字技术有限公司
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Publication of WO2018086221A1 publication Critical patent/WO2018086221A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/63—Generation or supply of power specially adapted for television receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
    • H04N21/4436—Power management, e.g. shutting down unused components of the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus

Definitions

  • the present invention relates to the field of HDMI technologies, and in particular, to an HDMI interface circuit of a master device and a method for powering a slave device based on an HDMI interface.
  • a standard USB interface or an HDMI interface is generally used; among them, a main device using a standard USB interface, such as a TV with a USB interface, can provide a hard disk, a keyboard, etc. 5V power supply voltage.
  • multimedia audiovisual content is developing in the direction of high resolution and high frame rate, and the bandwidth required for transmitting multimedia audiovisual content is also higher and higher; and the upper limit data transmission rate of the existing USB interface is low. It has been unable to meet the needs of product development, and is replaced by an HDMI interface with a higher upper data transmission rate.
  • the main object of the present invention is to provide an HDMI interface circuit of a master device and a method for powering a slave device based on an HDMI interface, which aims to realize that the master device supplies power to the slave device through the HDMI interface, so that the slave device no longer needs to separately configure the power source, thereby reducing From the size of the device, it is more compact.
  • the present invention provides an HDMI interface circuit of a master device, and the HDMI interface circuit of the master device includes:
  • a switch module an output end of the switch module is connected to the HDMI interface
  • a power module connected to the HDMI interface via the switch module
  • a detecting module configured to detect a resonance signal of the slave device when the HDMI interface accesses the slave device, and output a corresponding detection signal when the resonance signal is detected;
  • control module configured to control the switch module to be turned on when the detection signal is received, to control the power module to supply power to the slave device through the HDMI interface.
  • the HDMI interface includes an HPD signal transmission pin and a common power supply pin for supplying power to the other circuits of the main device and the slave device, and the output of the common power supply pin through the switch module and the power module End connection; the HPD signal transmission pin is connected to the HPD signal end of the main device.
  • the detecting module comprises:
  • the square wave signal output unit is configured to sequentially output a plurality of preset periodic square wave signals to the HDMI interface when the HDMI interface of the master device is accessed from the device, for triggering by the resonant signal of the slave device;
  • the detection signal triggering unit is configured to output the detection signal when the HDMI interface of the master device receives the resonance signal of the slave device.
  • the square wave signal output unit includes a first voltage source, a first resistor, a first capacitor, and a second capacitor, and a positive output terminal of the first voltage source is connected to the first end of the first resistor, a second output end of the first voltage source is grounded; a second end of the first resistor is interconnected with a first end of the first capacitor and a first end of the second capacitor; The second end is grounded; the second end of the second capacitor is connected to the HPD signal end of the master device.
  • the detection signal triggering unit includes a second voltage source, a first transistor, a second resistor, a third resistor, a fourth resistor, a third capacitor, and a fourth capacitor, and the first end of the third capacitor
  • An input end of the detection signal triggering unit, the second end of the third capacitor is mutually opposite to a base of the first transistor, a first end of the second resistor, and a first end of the third resistor
  • the second end of the second resistor is grounded;
  • the collector of the first transistor is an output end of the detection signal triggering unit, and the first end of the fourth resistor and the fourth a first end of the capacitor and a first end of the fourth capacitor are interconnected, an emitter of the first transistor is grounded; a second end of the third resistor and a second end of the fourth resistor,
  • the second end of the fourth capacitor and the positive output of the second voltage source are interconnected; the negative output of the second voltage source is grounded.
  • the detecting module comprises:
  • the square wave signal output unit is configured to sequentially output a plurality of preset periodic square wave signals to the HDMI interface when the HDMI interface of the master device is accessed from the device, for triggering by the resonant signal of the slave device;
  • the detection signal triggering unit is configured to output the detection signal when the HDMI interface of the master device receives the resonance signal of the slave device.
  • the square wave signal output unit includes a first voltage source, a first resistor, a first capacitor, and a second capacitor, and a positive output terminal of the first voltage source is connected to the first end of the first resistor, a second output end of the first voltage source is grounded; a second end of the first resistor is interconnected with a first end of the first capacitor and a first end of the second capacitor; The second end is grounded; the second end of the second capacitor is connected to the HPD signal end of the master device.
  • the detection signal triggering unit includes a second voltage source, a first transistor, a second resistor, a third resistor, a fourth resistor, a third capacitor, and a fourth capacitor, and the first end of the third capacitor
  • An input end of the detection signal triggering unit, the second end of the third capacitor is mutually opposite to a base of the first transistor, a first end of the second resistor, and a first end of the third resistor
  • the second end of the second resistor is grounded;
  • the collector of the first transistor is an output end of the detection signal triggering unit, and the first end of the fourth resistor and the fourth a first end of the capacitor and a first end of the fourth capacitor are interconnected, an emitter of the first transistor is grounded; a second end of the third resistor and a second end of the fourth resistor,
  • the second end of the fourth capacitor and the positive output of the second voltage source are interconnected; the negative output of the second voltage source is grounded.
  • the switch module includes a first switch unit and a second switch unit, an input end of the first switch unit is connected to the control module, an output end of the first switch unit and the second switch unit The controlled end connection; the input end of the second switch unit is connected to the power module, and the output end of the second switch unit is connected to the common power pin.
  • the first switching unit includes a second transistor, a fifth resistor, a sixth resistor, and a fifth capacitor
  • the first end of the fifth resistor is an input end of the first switch unit
  • a second end of the fifth resistor is interconnected with a first end of the sixth resistor, a first end of the fifth capacitor, and a base of the second transistor
  • the second end of the five capacitors is The second end of the fifth resistor is connected and grounded
  • the collector of the second transistor is connected to the controlled end of the second switch unit; and the emitter of the second transistor is grounded.
  • the second switch unit includes a seventh resistor, an eighth resistor, a sixth capacitor, and a MOS transistor, and the first end of the seventh resistor is a controlled end of the second switch unit, and is a first end of the eighth resistor is connected, a second end of the seventh resistor is connected to a gate of the MOS transistor and a first end of the sixth capacitor; and a second end of the eighth resistor is An input end of the second switching unit is interconnected with a second end of the sixth capacitor and a source of the MOS transistor; a drain of the MOS transistor is an output end of the second switching unit.
  • the present invention also provides a method for a master device to supply power to a slave device based on an HDMI interface, and the method for the master device to power the slave device based on the HDMI interface includes:
  • a power source is output to the HDMI interface to supply power to the slave device.
  • the step of detecting a resonance signal of the slave device when the HDMI interface of the master device is accessed from the device, and outputting a corresponding detection signal when detecting the resonance signal comprises:
  • a plurality of preset periodic square wave signals are sequentially outputted to the HDMI interface for triggering by the resonant signal of the slave device;
  • the detection signal is output when the HDMI interface of the master device receives the resonance signal of the slave device.
  • the HDMI interface circuit of the main device of the present invention controls the detection module to detect the slave device connected via the HDMI interface through the control module.
  • the resonance signal output by the slave device is detected, the corresponding detection signal is output to the control module, and the control module is After receiving the detection signal, the control switch module is turned on to control the power module to supply power to the accessed slave device via the HDMI interface.
  • the control switch module is turned on to control the power module to supply power to the accessed slave device via the HDMI interface.
  • FIG. 1 is a schematic diagram of functional blocks of a preferred embodiment of an HDMI interface circuit of a master device of the present invention
  • FIG. 2 is a schematic circuit diagram of a detection module in an HDMI interface circuit of the master device shown in FIG. 1;
  • FIG. 3 is a schematic circuit diagram of a switch module in an HDMI interface circuit of the master device shown in FIG. 1;
  • FIG. 4 is a schematic flow chart of a preferred embodiment of a method for a master device to supply power to a slave device based on an HDMI interface;
  • FIG. 5 is a schematic diagram showing the refinement process of step 10 in the method for the main device shown in FIG. 4 to supply power to the slave device based on the HDMI interface.
  • the directional indication is only used to explain in a certain posture (as shown in the drawing)
  • the relative positional relationship between the components, the motion situation, and the like if the specific posture changes, the directional indication also changes accordingly.
  • first”, “second”, etc. in the embodiments of the present invention, the description of the "first”, “second”, etc. is used for the purpose of description only, and is not to be construed as an Its relative importance or implicit indication of the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the technical solutions between the various embodiments may be combined with each other, but must be based on the realization of those skilled in the art, and when the combination of the technical solutions is contradictory or impossible to implement, it should be considered that the combination of the technical solutions does not exist. It is also within the scope of protection required by the present invention.
  • the invention provides an HDMI interface circuit of a master device.
  • an HDMI interface circuit of the master device includes an HDMI interface 10, a detection module 20, a control module 30, a power module 40, and a switch module 50.
  • the power module 40 is connected to the HDMI interface 10 via the switch module 50.
  • the detecting module 20 is configured to detect a resonance signal of the slave device when the HDMI interface 10 is connected to the slave device, and detect The resonant signal outputs a corresponding detection signal;
  • the control module 30 is configured to control the switch module 50 to be turned on when the detection signal is received, to control the power module 40 to supply power to the slave device.
  • the slave device is divided into two types: an independent power supply and an independent power supply.
  • an independent power supply when the data is transmitted with the master device, the HDMI interface 10 can be used.
  • the HPD signal related circuit of the device provides power for the pull-up power supply and the EDID storage module of the main device.
  • the slave device does not have an independent power supply, when the data is transmitted with the master device, the master device needs to supply power to operate normally, and the slave device that is not provided with the independent power supply is provided with a resonant circuit.
  • the master device can determine that the accessed slave device is not provided with an independent power source by detecting the resonance signal output from the device, and power the slave device when the slave device does not have an independent power source. .
  • the control module 30 controls the detection module 20 to detect the resonance signal output by the slave device, and outputs a corresponding detection signal to the control module 30, and the control module 30 receives the slave device. After the detection signal, the control switch module 50 is turned on to control the power module 40 to supply power to the accessed slave device via the HDMI interface 10. When the resonant signal output by the slave device is not detected, the corresponding detection signal is output to the control module 30, and after receiving the detection signal, the control module 30 controls the switch module 50 to be turned off to control the power module 40 not to pass through the HDMI interface 10. Power the connected slave device.
  • the master device is a television and the slave device is a DVD
  • the television and the DVD are connected through the HDMI interface
  • the television detects the resonance signal output by the slave device it is determined that the DVD does not have an independent power source.
  • power the DVD through the HDMI interface to make the DVD work.
  • the DVD can read the E-EDID data of the TV, and after the communication between the DVD and the TV is completed, the audio and video signals are transmitted to the TV through the HDMI interface.
  • the HDMI interface circuit of the main device of the present invention controls the detection module 20 to detect the slave device connected via the HDMI interface 10 through the control module 30.
  • the resonance signal output by the slave device is detected, the corresponding detection signal is output to the control module 30.
  • the control module 30 controls the switch module 50 to be turned on to control the power module 40 to supply power to the accessed slave device via the HDMI interface 10.
  • the slave device that is not provided with the independent power supply can be powered when data is transmitted with the slave device that is not provided with the independent power supply, thereby realizing the master device to pass the HDMI interface.
  • the slave device no longer needs to be separately configured with a power source, thereby reducing the size of the slave device and making it more compact.
  • the HDMI interface 10 includes an HPD signal transmission pin HPD and a common power supply pin for supplying power to other circuits and slave devices of the master device.
  • the switch module 50 is connected to the output terminal OUT of the power module 40; the HPD signal transmission pin HPD is connected to the HPD signal terminal of the master device.
  • the control module 30 receives the detection signal.
  • the rear control switch module 50 is turned on to control the power module 40 to supply power to the slave device accessed via the power common pin VCC.
  • the power module 40 also outputs power to the HPD signal related circuit of the master device through the power supply common pin VCC to provide a pull-up.
  • the power supply, and/or output power to the EDID storage module of the primary device to power the EDID storage module.
  • the control module 30 of the master device transmits the HPD signal of the HPD signal transmission pin HPD from The low level is pulled high, so that the slave device reads the E-EDID data of the master device through other pins of the HDMI interface 10 after detecting that the HPD signal level changes from low level to high level. Realize communication between the slave device and the master device, so that the master device can receive audio and video signals output from the device.
  • the HPD interface 10 of the master device realizes that when the slave device is configured to provide independent power, the master device supplies power to the slave device through the HDMI interface 10, so that the slave device no longer needs to separately configure the power source, thereby reducing the volume of the slave device. It is more compact.
  • the detecting module 20 includes:
  • the square wave signal output unit 21 is configured to sequentially output a plurality of preset periodic square wave signals to the HDMI interface 10 when the HDMI interface 10 of the master device has the slave device access, for the resonance signal of the slave device. trigger;
  • the detection signal triggering unit 22 is configured to output the detection signal when the HDMI interface 10 of the master device receives the resonance signal of the slave device.
  • the slave device without the independent power supply is provided with a resonant circuit, and each resonant circuit itself has a specific resonant frequency, which is determined by the circuit component parameters, and is generally a parameter of L and C.
  • the overall impedance of the circuit is small, so that when the frequency of the square wave signal input through the square wave signal output unit 21 is equal to the resonant frequency, the circuit impedance is the smallest, and the resonance
  • the circuit outputs the resonance frequency to the detection signal triggering unit 22, thereby determining that the slave device is a device that is not provided with an independent power supply.
  • the square wave signal output unit 21 when the HDMI interface 10 of the master device has a slave device access, the square wave signal output unit 21 outputs a square wave signal of a different period to detect the resonant frequency of the slave device, and the detection signal triggering unit 22 detects The detection signal is outputted to the control module 30 after the resonant frequency outputted from the device.
  • the square wave signal output unit 21 will continue to periodically output the square wave signals of different periods to provide independent power sources for the slave devices that are not provided with independent power sources.
  • the control detection signal triggering unit 22 When the slave device switches between the devices, the control detection signal triggering unit 22 outputs a detection signal to the control module 30, so that the control module 30 outputs a corresponding control signal to control the switch module 50 to be turned off, thereby controlling the power module 40 to pass the HDMI.
  • the interface 10 stops supplying power to the slave device.
  • the square wave signal output unit 21 includes a first voltage source V1, a first resistor R1, a first capacitor C1, and a second capacitor C2.
  • the positive output terminal of the first voltage source V1 is The first end of the first resistor R1 is connected, the negative end of the first voltage source V1 is grounded; the second end of the first resistor R1 is opposite to the first end of the first capacitor C1 and the second The first end of the capacitor C2 is interconnected; the second end of the first capacitor C1 is grounded; and the second end of the second capacitor C2 is connected to the HPD signal end of the master device.
  • the first voltage source V1 is controlled by the control module 30 for outputting a square wave signal of different periods, and the RC integrating circuit composed of the first resistor R1 and the first capacitor C1 outputs the first voltage source V1.
  • the square wave signal is converted into a sawtooth wave and output to highlight the DC and slowly varying components of the square wave signal, and at the same time reduce the variation of the square wave signal, so that the resonant circuit on the slave device receives better output through the first voltage source V1. Signal to reduce the false positive rate of detection.
  • the detection signal triggering unit 22 includes a second voltage source V2, a first transistor Q1, a second resistor R2, a third resistor R3, a fourth resistor R4, a third capacitor C3, and a fourth a capacitor C4, a first end of the third capacitor C3 is an input end of the detection signal triggering unit 22, a second end of the third capacitor C3 is opposite to a base and a second of the first transistor Q1
  • the first end of the resistor R2 and the first end of the third resistor R3 are interconnected; the second end of the second resistor R2 is grounded; the collector of the first transistor Q1 is the detection signal trigger unit
  • An output end of the second resistor R4 is interconnected with a first end of the fourth resistor R4 and a first end of the fourth capacitor C4 and a first end of the fourth capacitor C4, the first transistor Q1
  • the second end of the third resistor R3 is interconnected with the second end of the fourth resistor R4, the second end of the fourth capacitor C4, and the positive output terminal of
  • the resonant circuit when the resonant circuit receives the square wave signal outputted by the square wave signal output unit 21 and generates resonance, the resonant signal is coupled via the third capacitor C3 and output to the base of the first transistor Q1.
  • the voltage signal outputted by the second voltage source V2 is divided by the second resistor R2 and the third resistor R3, and then output to the base of the first transistor Q1, so that during the positive phase of the resonant signal, the resonant signal is
  • the voltage signals outputted by the second voltage source V2 are superimposed to turn on the first transistor Q1, after the first transistor Q1 is turned on, the level of the collector of the first transistor Q1 is pulled down and output.
  • a low level signal is sent to the control module 30.
  • the detecting module further includes a third voltage source V3 and a ninth resistor R9, and the third power source is controlled based on the control module 30 of the master device, and is used for transmitting the HPD signal when the master device and the slave device perform data transmission.
  • the HPD outputs a corresponding low or high HPD signal.
  • control module 30 can be implemented by using an MCU control chip.
  • the MCU control chip has a signal control pin, a detection signal receiving pin D, and a switch control pin O/F.
  • the signal control pin is used to output a square wave.
  • the signal control pin is connected to the input end of the square wave signal output unit 21; the detection signal receiving pin D is for receiving the detection signal outputted by the output end of the detection signal triggering unit 22; the switch control pin O/F is for outputting the control signal to control the switch module 50 action.
  • the switch module 50 includes a first switch unit 51 and a second switch unit 52.
  • the input end of the first switch unit 51 is connected to the control module 30.
  • An output end of a switch unit 51 is connected to a controlled end of the second switch unit 52; an input end of the second switch unit 52 is connected to the power module 40, and an output end of the second switch unit 52 is The common power supply pin VCC is connected.
  • the switch response speed is increased by setting the second switch of the first switch unit 51 and the second switch unit 52.
  • the first switch unit 51 includes a second transistor Q2, a fifth resistor R5, a sixth resistor R6, and a fifth capacitor C5, and the first end of the fifth resistor R5 is The input end of the first switch unit 51, the second end of the fifth resistor R5 and the first end of the sixth resistor R6, the first end of the fifth capacitor C5, and the base of the second transistor Q2 a second terminal of the fifth capacitor is connected to the second end of the fifth resistor R5 and grounded; the collector of the second transistor Q2 is controlled by the second switch unit 52 The terminal is connected; the emitter of the second transistor Q2 is grounded.
  • the first transistor Q1 when the base of the second transistor Q2 receives the control signal output by the control module 30, the first transistor Q1 is turned on/off, thereby triggering the second switch unit 52 to operate.
  • the second switch unit 52 further includes a seventh resistor R7, an eighth resistor R8, a sixth capacitor C6, and a MOS transistor QW1, and the first end of the seventh resistor R7 is the second switch. a controlled end of the unit 52, and connected to the first end of the eighth resistor R8, the second end of the seventh resistor R7 and the gate of the MOS transistor QW1 and the first of the sixth capacitor C6
  • the second end of the eighth resistor R8 is an input end of the second switch unit 52, and is interconnected with a second end of the sixth capacitor C6 and a source of the MOS transistor QW1;
  • the drain of the MOS transistor QW1 is the output terminal of the second switching unit 52.
  • the MOS transistor QW1 when the gate of the MOS transistor QW1 receives the trigger signal output by the first switching unit 51 via the seventh resistor R7, the MOS transistor QW1 is turned on, so that the power module 40 passes through the HDMI interface through the MOS transistor QW1. 10 powering the slave device.
  • the MCU control chip when the HDMI interface 10 of the master device is connected to the slave device, the MCU control chip outputs a square wave signal control signal via the signal control pin to control the first voltage source V1 to output a square wave signal of a different period.
  • the square wave signal is formed into an integrating circuit by the first resistor R1 and the first capacitor C1 to convert the square wave signal into a sawtooth wave signal, and then outputted to the HPD signal end of the slave device via the HPD transmission pin HPD of the HDMI interface 10, if the slave signal is detected
  • the HPD signal end of the device is provided with a resonant circuit, and when the resonant circuit receives the sawtooth wave signal and generates resonance, the resonant signal is coupled to the base of the first transistor Q1 via the third capacitor C3, and the second voltage source
  • the voltage signal outputted by V2 is divided by the second resistor R2 and the third resistor R3, and then output to the base of the first transistor Q1, so that during the positive phase of the resonant signal, the resonant signal and the second voltage source V2 After the output voltage signals are superimposed to turn on the first transistor Q1, after the first transistor Q1 is turned on, the level of the collector of the first transistor Q1 is pulled low to output a low level
  • the MCU control chip D After receiving the detection signal, the MCU control chip outputs an enable signal to the base of the second transistor Q2 via the switch control pin O/F, so that the first transistor Q1 is turned on, thereby triggering the MOS transistor QW1.
  • the power module 40 is controlled to supply power to the accessed slave device via the power supply common pin VCC of the HDMI interface 10.
  • the power module 40 also outputs power to the HPD signal related circuit of the master device through the power supply common pin VCC to provide a pull-up.
  • the power supply, and/or the output power to the EDID storage module of the primary device is used to power the EDID storage module.
  • the MCU control chip If it is detected that the resonant circuit is not provided on the HPD signal end of the slave device, how can the slave device itself be determined to have an independent power supply, and the MCU control chip outputs a shutdown signal to the second transistor Q2 via the switch control pin O/F.
  • the base is turned off to turn off the first transistor Q1, thereby triggering the MOS transistor QW1 to be turned off, so as to control the power module 40 to stop supplying power to the accessed slave device via the power supply common pin VCC of the HDMI interface 10.
  • the power supply mechanism of the slave device will output power to the HPD signal related circuit of the master device through the power supply common pin VCC to provide a pull-up power supply, and/or output power to the EDID storage module of the master device to supply the EDID storage module.
  • the first voltage source V1 inputs a square wave signal that is continuous and has a different period, thereby determining whether the slave device is provided by whether the slave device is provided with a resonance circuit. Whether a separate power supply is provided and the slave device is powered when the power supply is not set.
  • the square wave signal with continuous and different periods is output to detect that the independent power supply is not set to switch from the slave device with the independent power supply, the power module 40 is controlled to stop supplying power to the slave device.
  • the present invention further provides a method for a master device to supply power to a slave device based on an HDMI interface, and the control method includes the following steps:
  • the slave device is divided into two types: an independent power supply and an independent power supply.
  • an independent power supply when the data is transmitted with the master device, the HDMI interface can be used.
  • the HPD signal related circuit of the master device provides power for the pull-up power supply and the EDID storage module of the master device.
  • the slave device does not have an independent power supply, when the data is transmitted with the master device, the master device needs to supply power to operate normally, and the slave device that is not provided with an independent power supply is provided with a resonance circuit.
  • the master device can determine that the slave device that is connected is not provided with an independent power source by detecting the resonance signal output from the resonant circuit on the device, and the independent power source is not set in the slave device.
  • the slave device is powered, and the resonant signal output from the slave device is not detected, it is determined that the slave device that is connected has an independent power source, and the slave device does not need to be powered.
  • the HDMI interface of the master device detects that there is a slave device access, detecting the presence or absence of the resonance signal on the slave device to determine whether a resonant circuit is disposed on the slave device, and if the resonant signal is detected, determining that the slave device is provided with a resonance
  • the circuit that is, the slave device is not provided with an independent power supply, and outputs a corresponding detection signal, and the detection signal is a primary resonance signal output by the resonance circuit. If the resonance signal is not detected, it is determined that the slave device is not provided with a resonance circuit, that is, the slave device is provided with an independent power supply source, and outputs a corresponding detection signal.
  • the master device When receiving the detection signal detecting the resonance signal, it can be determined that the slave device is not provided with an independent power supply, and the master device outputs the power source to the slave device via the HDMI interface 10 to supply power to the slave device for data transmission.
  • the slave device When receiving the detection signal that the resonance signal is not detected, it can be determined that the slave device sets an independent power supply, and the master device does not need to output the power source to the slave device via the HDMI interface.
  • the method for powering the slave device based on the HDMI interface of the present invention detects the slave device when the HDMI interface of the master device is connected to the slave device, and outputs a corresponding detection signal when detecting the resonance signal output by the slave device
  • the slave device is powered by the HDMI interface. In this way, when the data transmission is performed with the slave device that is not provided with the independent power supply, the slave device that is not provided with the independent power supply is powered, so that the master device supplies power to the slave device through the HDMI interface, so that the slave device no longer needs to be separately configured.
  • the power supply thus reduces the volume of the slave device and makes it more compact.
  • the step S10 includes:
  • the slave device without the independent power supply is provided with a resonant circuit, and each resonant circuit itself has a specific resonant frequency, which is determined by the circuit component parameters, and is generally a parameter of L and C.
  • the overall impedance of the circuit is small, so that when the square wave signal frequency is equal to the resonant frequency, the circuit impedance is minimal, that is, the resonant signal of the slave device is triggered.
  • the square wave signal with different periods is preset in the master device.
  • the square wave signal of different cycles is output to the HPD signal end of the HDMI interface, and the slave device is set in the slave device.
  • the resonant signal is generated by the resonant circuit on the trigger device.
  • a plurality of square wave signals with different periods are preset in the master device to be periodically outputted, so that the slave device and the independent power source are not independently set.
  • the power source can be monitored in time when switching between devices, and the accuracy of the detection signal can be improved.
  • the slave device to which the HDMI interface 10 of the master device is connected is not provided with an independent power supply, and the corresponding detection signal is output.
  • the method for powering the slave device based on the HDMI interface of the present invention sequentially outputs a plurality of preset periodic square wave signals to the HDMI interface for the slave device when the HDMI interface of the master device is connected to the slave device.
  • the resonant signal is triggered, and when the resonant signal output by the slave device is detected, a corresponding detection signal is output, and then the accessed slave device is powered via the HDMI interface.
  • the slave device that is not provided with the independent power supply is powered, so that the master device supplies power to the slave device through the HDMI interface, so that the slave device no longer needs to be separately configured.
  • the power supply thus reduces the volume of the slave device and makes it more compact.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

L'invention concerne un circuit d'interface HDMI pour un dispositif maître, et un procédé pour fournir de l'énergie par un dispositif maître à un dispositif esclave sur la base d'une interface HDMI. Le circuit d'interface HDMI pour un dispositif maître comprend : une interface HDMI (10) ; un module de commutation (50), dont une extrémité de sortie est connectée à l'interface HDMI (10) ; un module d'alimentation électrique (40) connecté à l'interface HDMI (10) au moyen du module de commutation (50) ; un module de détection (20) utilisé pour détecter un signal de résonance du dispositif esclave lorsque l'interface HDMI (10) accède au dispositif esclave, et émettre un signal de détection correspondant lors de la détection du signal de résonance ; et un module de commande (30) utilisé pour commander au module de commutation (50) de s'allumer lors de la réception du signal de détection, pour commander au module d'alimentation électrique (40) de fournir de l'énergie au dispositif esclave au moyen de l'interface HDMI (10). Selon le circuit d'interface et le procédé, le dispositif maître fournit de l'énergie au dispositif esclave au moyen de l'interface HDMI (10) de sorte qu'il n'est pas nécessaire de configurer séparément une alimentation électrique pour le dispositif esclave, qui peut alors être miniaturisé et rendu plus compact.
PCT/CN2016/112830 2016-11-09 2016-12-29 Circuit d'interface hdmi pour dispositif maître, et procédé pour fournir de l'énergie à un dispositif esclave sur la base d'une interface hdmi WO2018086221A1 (fr)

Applications Claiming Priority (2)

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CN201610988862.9A CN106791526A (zh) 2016-11-09 2016-11-09 主设备的hdmi接口电路及基于hdmi接口给从设备供电的方法
CN201610988862.9 2016-11-09

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WO2018086221A1 true WO2018086221A1 (fr) 2018-05-17

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