WO2018086221A1 - 主设备的hdmi接口电路及基于hdmi接口给从设备供电的方法 - Google Patents

主设备的hdmi接口电路及基于hdmi接口给从设备供电的方法 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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PCT/CN2016/112830
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English (en)
French (fr)
Inventor
吴有肇
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Shenzhen TCL Digital Technology Co Ltd
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Shenzhen TCL Digital Technology Co Ltd
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Publication of WO2018086221A1 publication Critical patent/WO2018086221A1/zh
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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.

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

Abstract

一种主设备的HDMI接口电路及主设备基于HDMI接口给从设备供电的方法，包括HDMI接口（10）；开关模块（50），开关模块（50）的输出端与所述HDMI接口（10）连接；电源模块（40），经开关模块（50）与HDMI接口（10）连接；检测模块（20），用于在HDMI接口（10）接入从设备时，检测从设备的谐振信号，并在检测到谐振信号时输出相应的检测信号；控制模块（30），用于在接收到检测信号时，控制开关模块（50）开启，以控制电源模块（40）通过HDMI接口（10）给从设备供电。该接口电路及方法实现了主设备通过HDMI接口（10）给从设备供电，使从设备不再需要单独配置电源，减少从设备的体积，使之更小型化。

Description

主设备的HDMI接口电路及基于HDMI接口给从设备供电的方法
技术领域
本发明涉及HDMI技术领域，特别涉及一种主设备的HDMI接口电路及基于HDMI接口给从设备供电的方法。
背景技术
目前，多媒体视听设备、通讯设备等进行数据传输时，一般采用标准的USB接口或HDMI接口；其中，采用标准USB接口通讯的主设备如带USB接口的电视机可以给硬盘、键盘等从设备提供5V的电源电压。
随着多媒体相关技术的发展，多媒体视听内容向高分辨率、高帧率的方向发展，传输多媒体视听内容所需的带宽要求也越来越高；而现有的USB接口的上限数据传输速率低，已经无法满足产品发展的需求，取而代之的是上限数据传输速率更高的HDMI接口。
当前多媒体视听设备、通讯设备的发展趋势是向小型化发展，但是，由于这些设备自带独立供电电源，且电源体积难以改善，由此限制了多媒体视听设备、通讯设备向小型化发展。
发明内容
本发明的主要目的是提出一种主设备的HDMI接口电路及基于HDMI接口给从设备供电的方法，旨在实现主设备通过HDMI接口给从设备供电，使从设备不再需要单独配置电源，减少从设备的体积，使之更小型化。
为实现上述目的，本发明提出的一种主设备的HDMI接口电路，该主设备的HDMI接口电路包括：
HDMI接口；
开关模块，所述开关模块的输出端与所述HDMI接口连接；
电源模块，经所述开关模块与所述HDMI接口连接；
检测模块，用于在所述HDMI接口接入从设备时，检测所述从设备的谐振信号，并在检测到所述谐振信号时输出相应的检测信号；
控制模块，用于在接收到所述检测信号时，控制所述开关模块开启，以控制所述电源模块通过所述HDMI接口给所述从设备供电。
优选地，所述HDMI接口包括HPD信号传输脚及用于给所述主设备的其他电路和从设备提供电源的公共电源脚，所述公共电源脚经所述开关模块与所述电源模块的输出端连接；所述HPD信号传输脚与所述主设备的HPD信号端连接。
优选地，所述检测模块包括：
方波信号输出单元，用于在主设备的HDMI接口有从设备接入时，依次输出多个预设周期的方波信号至所述HDMI接口，以供所述从设备的谐振信号触发；
检测信号触发单元，用于当所述主设备的HDMI接口接收到所述从设备的谐振信号时，输出所述检测信号。
优选地，所述方波信号输出单元包括第一电压源、第一电阻、第一电容及第二电容，所述第一电压源的正极输出端与所述第一电阻的第一端连接，所述第一电压源的负极输出端接地；所述第一电阻的第二端与所述第一电容的第一端及所述第二电容的第一端互连；所述第一电容的第二端接地；所述第二电容的第二端与所述主设备的HPD信号端连接。
优选地，所述检测信号触发单元包括第二电压源、第一三极管、第二电阻、第三电阻、第四电阻、第三电容及第四电容，所述第三电容的第一端为所述检测信号触发单元的输入端，所述第三电容的第二端与所述第一三极管的基极、第二电阻的第一端及所述第三电阻的第一端互连；所述第二电阻的第二端接地；所述第一三极管的集电极为所述检测信号触发单元的输出端，并与所述第四电阻的第一端及所述第四电容的第一端及所述第四电容的第一端互连，所述第一三极管的发射极接地；所述第三电阻的第二端与所述第四电阻的第二端、第四电容的第二端及所述第二电压源的正极输出端互连；所述第二电压源的负极输出端接地。
优选地，所述检测模块包括：
方波信号输出单元，用于在主设备的HDMI接口有从设备接入时，依次输出多个预设周期的方波信号至所述HDMI接口，以供所述从设备的谐振信号触发；
检测信号触发单元，用于当所述主设备的HDMI接口接收到所述从设备的谐振信号时，输出所述检测信号。
优选地，所述方波信号输出单元包括第一电压源、第一电阻、第一电容及第二电容，所述第一电压源的正极输出端与所述第一电阻的第一端连接，所述第一电压源的负极输出端接地；所述第一电阻的第二端与所述第一电容的第一端及所述第二电容的第一端互连；所述第一电容的第二端接地；所述第二电容的第二端与所述主设备的HPD信号端连接。
优选地，所述检测信号触发单元包括第二电压源、第一三极管、第二电阻、第三电阻、第四电阻、第三电容及第四电容，所述第三电容的第一端为所述检测信号触发单元的输入端，所述第三电容的第二端与所述第一三极管的基极、第二电阻的第一端及所述第三电阻的第一端互连；所述第二电阻的第二端接地；所述第一三极管的集电极为所述检测信号触发单元的输出端，并与所述第四电阻的第一端及所述第四电容的第一端及所述第四电容的第一端互连，所述第一三极管的发射极接地；所述第三电阻的第二端与所述第四电阻的第二端、第四电容的第二端及所述第二电压源的正极输出端互连；所述第二电压源的负极输出端接地。
优选地，所述开关模块包括第一开关单元及第二开关单元，所述第一开关单元的输入端与所述控制模块连接，所述第一开关单元的输出端与所述第二开关单元的受控端连接；所述第二开关单元的输入端与所述电源模块连接，所述第二开关单元的输出端与所述公共电源脚连接。
优选地，所述第一开关单元包括第二三极管、第五电阻、第六电阻及第五电容，所述第五电阻的第一端为所述第一开关单元的输入端，所述第五电阻的第二端与所述第六电阻的第一端、第五电容的第一端及所述第二三极管的基极互连；所述五电容的第二端与所述第五电阻的第二端连接，并接地；所述第二三极管的集电极与所述第二开关单元的受控端连接；所述第二三极管的发射极接地。
优选地，所述第二开关单元包括第七电阻、第八电阻、第六电容及MOS管，所述第七电阻的第一端为所述第二开关单元的受控端，并与所述第八电阻的第一端连接，所述第七电阻的第二端与所述MOS管的栅极及所述第六电容的第一端连接；所述第八电阻的第二端为所述第二开关单元的输入端，并与所述第六电容的第二端及所述MOS管的源极互连；所述MOS管的漏极为所述第二开关单元的输出端。
本发明还提出一种主设备基于HDMI接口给从设备供电的方法，所述主设备基于HDMI接口给从设备供电的方法的步骤包括：
在主设备的HDMI接口有从设备接入时，检测所述从设备的谐振信号，并在检测到所述谐振信号时输出相应的检测信号；
在接收到所述检测信号时，输出电源至所述HDMI接口，以给所述从设备供电。
优选地，所述在主设备的HDMI接口有从设备接入时，检测所述从设备的谐振信号，并在检测到所述谐振信号时输出相应的检测信号的步骤包括：
在主设备的HDMI接口有从设备接入时，依次输出多个预设周期的方波信号至所述HDMI接口，以供所述从设备的谐振信号触发；
当所述主设备的HDMI接口接收到所述从设备的谐振信号时，输出所述检测信号。
本发明主设备的HDMI接口电路通过控制模块来控制检测模块以检测经HDMI接口连接的从设备，当检测到所述从设备输出的谐振信号时，输出相应的检测信号至控制模块，控制模块在接收到该检测信号后控制开关模块开启，以控制电源模块经HDMI接口给接入的从设备供电。这样，采用本发明主设备的HDMI接口电路，便可在与未设置独立的供电电源的从设备进行数据传输时，给未设置独立供电电源的从设备供电，以实现主设备通过HDMI接口给从设备供电，使从设备不再需要单独配置电源，减少从设备的体积，使之更小型化。
附图说明
为了更清楚地说明本发明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发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图示出的结构获得其他的附图。
图1为本发明主设备的HDMI接口电路较佳实施例的功能模块示意图；
图2为图1所示主设备的HDMI接口电路中检测模块的电路结构示意图；
图3为图1所示主设备的HDMI接口电路中开关模块的电路结构示意图；
图4为本发明主设备基于HDMI接口给从设备供电的方法较佳实施例的流程示意图；
图5为图4所示的主设备基于HDMI接口给从设备供电的方法中步骤10的细化流程示意图。
附图标号说明：
标号 名称 标号 名称 标号 名称
10 HDMI接口 R2 第二电阻 C1 第一电容
20 检测模块 R3 第三电阻 C2 第二电容
30 控制模块 R4 第四电阻 C3 第三电容
40 电源模块 R5 第五电阻 C4 第四电容
50 开关模块 R6 第六电阻 C5 第五电容
21 方波信号输出单元 R7 第七电阻 C6 第六电容
22 检测信号触发单元 R8 第八电阻 C7 第七电容
51 第一开关单元 R9 第九电阻 Q1 第一三极管
52 第二开关单元 OUT 电源模块输出端 Q2 第二三极管
R1 第一电阻 D 检测信号接收脚 QW1 MOS管
VCC 电源公共脚 O/F 开关控制脚 HPD HPD传输脚
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明，若本发明实施例中有涉及方向性指示（诸如上、下、左、右、前、后……），则该方向性指示仅用于解释在某一特定姿态（如附图所示）下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，若本发明实施例中有涉及“第一”、“第二”等的描述，则该“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本发明要求的保护范围之内。
本发明提出一种主设备的HDMI接口电路。
参照图1，在本发明一实施例中，该主设备的HDMI接口电路包括HDMI接口10、检测模块20、控制模块30、电源模块40及开关模块50。
本实施例中，电源模块40经开关模块50与所述HDMI接口10连接；检测模块20用于在所述HDMI接口10接入从设备时，检测所述从设备的谐振信号，并在检测到所述谐振信号时输出相应的检测信号；控制模块30用于在接收到所述检测信号时，控制所述开关模块50开启，以控制所述电源模块40给所述从设备供电。
需要说明的是，从设备分为设有独立供电电源及未设置独立供电电源两种，当从设备上设置有独立的供电电源，在与主设备进行数据传输时，可以通过HDMI接口10为主设备的HPD信号相关电路提供上拉电源以及为主设备的EDID存储模块等供电。当从设备上未设置独立供电电源，在与主设备进行数据传输时，需要主设备给其供电才能正常工作，而在未设置有独立供电电源的从设备上均设置有谐振电路，因此，当主设备的HDMI接口10接入有从设备时，主设备可以通过检测从设备输出的谐振信号来判断接入的从设备上未设置有独立电源，并在从设备未设置独立电源时为从设备供电。
具体地，当所述HDMI接口10接入有从设备时，控制模块30控制检测模块20检测到所述从设备输出的谐振信号时，输出相应的检测信号至控制模块30，控制模块30在接收到该检测信号后控制开关模块50开启，以控制电源模块40经HDMI接口10给接入的从设备供电。当未检测到所述从设备输出的谐振信号时，输出相应的检测信号至控制模块30，控制模块30在接收到该检测信号后控制开关模块50关闭，以控制电源模块40经HDMI接口10不给接入的从设备供电。例如，主设备为电视机，从设备为DVD的应用中，当电视机与DVD通过HDMI接口连接时，在电视机检测到所述从设备输出的谐振信号时，判断该DVD未设置独立电源，并通过HDMI接口给DVD供电，以使DVD工作。这样DVD便可在读取电视机的E-EDID数据，完成DVD和电视机间的通讯后，通过HDMI接口将音视频信号传输给电视机。
本发明主设备的HDMI接口电路通过控制模块30来控制检测模块20以检测经HDMI接口10连接的从设备，当检测到所述从设备输出的谐振信号时，输出相应的检测信号至控制模块30，控制模块30在接收到该检测信号后控制开关模块50开启，以控制电源模块40经HDMI接口10给接入的从设备供电。这样，采用本发明主设备的HDMI接口电路，便可在与未设置独立的供电电源的从设备进行数据传输时，给未设置独立供电电源的从设备供电，从而实现了主设备通过HDMI接口给从设备供电，使从设备不再需要单独配置电源，从而减少从设备的体积，使之更小型化。
参照图2，在一优选实施例中，所述HDMI接口10包括HPD信号传输脚HPD及用于给所述主设备的其他电路和从设备提供电源的公共电源脚，所述公共电源脚经所述开关模块50与所述电源模块40的输出端OUT连接；所述HPD信号传输脚HPD与所述主设备的HPD信号端连接。
具体地，当主设备的HDMI接口10与从设备连接时，若检测模块20检测到所述从设备输出的谐振信号时，输出相应的检测信号至控制模块30，控制模块30在接收到该检测信号后控制开关模块50开启，以控制电源模块40经电源公共脚VCC给接入的从设备供电，同时，电源模块40还通过电源公共脚VCC输出电源至主设备的HPD信号相关电路以提供上拉电源，和/或输出电源至主设备的EDID存储模块以给EDID存储模块供电。
此外，主设备给从设备提供电后，如果主设备已经准备好了E-EDID数据且E-EDID数据处于可读状态，主设备的控制模块30就会将HPD信号传输脚HPD的HPD信号从低电平拉为高电平，以使从设备在检测到HPD信号电平从低电平变为高电平后，通过HDMI接口10的其他引脚读取主设备的E-EDID数据，以实现从设备和主设备间的通讯，这样主设备便可接收从设备输出的音视频信号。
本实施例中，主设备的HPD接口10实现了在从设备为设置独立电源时，主设备通过HDMI接口10给从设备供电，使从设备不再需要单独配置电源，减少从设备的体积，使之更小型化。
参照图2，在一优选实施例中，所述检测模块20包括：
方波信号输出单元21，用于在主设备的HDMI接口10有从设备接入时，依次输出多个预设周期的方波信号至所述HDMI接口10，以供所述从设备的谐振信号触发；
检测信号触发单元22，用于当所述主设备的HDMI接口10接收到所述从设备的谐振信号时，输出所述检测信号。
需要说明的是，未设置独立供电电源的从设备上均设置有谐振电路，且每一谐振电路本身均具有一个特定谐振频率，该频率由电路元件参数决定，一般是L、C的参数。当外部输入的信号的频率与电路谐振频率相等或相近时，电路表现的总体阻抗较小，这样，当经方波信号输出单元21输入的方波信号频率等于谐振频率时，电路阻抗最小，谐振电路将该谐振频率输出至检测信号触发单元22，从而判定该从设备为未设置独立供电电源的设备。
在本实施例中，在主设备的HDMI接口10有从设备接入时，方波信号输出单元21将输出不同周期的方波信号以检测从设备的谐振频率，检测信号触发单元22在检测到从设备输出的谐振频率后将检测信号输出至控制模块30，此外，方波信号输出单元21将继续周期性地输出不同周期的方波信号以在未设置独立电源的从设备与设置有独立电源的从设备之间进行切换时，控制检测信号触发单元22输出检测信号至控制模块30，从而使得控制模块30输出相应的控制信号，以控制开关模块50关闭，从而控制电源模块40通过所述HDMI接口10停止给所述从设备供电。
参照图2，进一步地，所述方波信号输出单元21包括第一电压源V1、第一电阻R1、第一电容C1及第二电容C2，所述第一电压源V1的正极输出端与所述第一电阻R1的第一端连接，所述第一电压源V1的负极输出端接地；所述第一电阻R1的第二端与所述第一电容C1的第一端及所述第二电容C2的第一端互连；所述第一电容C1的第二端接地；所述第二电容C2的第二端与所述主设备的HPD信号端连接。
本实施例中，第一电压源V1基于控制模块30控制，用于输出不同周期的方波信号，由第一电阻R1、第一电容C1组成的RC积分电路，将第一电压源V1输出的方波信号转换成锯齿波后输出，以突出方波信号的直流及缓变分量，同时减少方波信号的变化量，从而使得从设备上的谐振电路更好的接收经第一电压源V1输出的信号，以减小检测的误判率。
参照图2，进一步地，所述检测信号触发单元22包括第二电压源V2、第一三极管Q1、第二电阻R2、第三电阻R3、第四电阻R4、第三电容C3及第四电容C4，所述第三电容C3的第一端为所述检测信号触发单元22的输入端，所述第三电容C3的第二端与所述第一三极管Q1的基极、第二电阻R2的第一端及所述第三电阻R3的第一端互连；所述第二电阻R2的第二端接地；所述第一三极管Q1的集电极为所述检测信号触发单元22的输出端，并与所述第四电阻R4的第一端及所述第四电容C4的第一端及所述第四电容C4的第一端互连，所述第一三极管Q1的发射极接地；所述第三电阻R3的第二端与所述第四电阻R4的第二端、第四电容C4的第二端及所述第二电压源V2的正极输出端互连；所述第二电压源V2的负极输出端接地。
本实施例中，当谐振电路接收到经方波信号输出单元21输出的方波信号，并产生谐振时，该谐振信号经第三电容C3进行耦合后输出至第一三极管Q1的基极，同时第二电压源V2输出的电压信号经第二电阻R2及第三电阻R3进行分压后，输出至第一三极管Q1的基极，从而在谐振信号的正相期间，谐振信号与第二电压源V2输出的电压信号进行叠加之后以使第一三极管Q1导通，第一三极管Q1导通后，第一三极管Q1的集电极的电平被拉低而输出一低电平信号至控制模块30。
进一步地，所述检测模块还包括第三电压源V3及第九电阻R9，第三电源基于主设备的控制模块30控制，用于在主设备与从设备进行数据传输时，经HPD信号传输脚HPD输出相应的低电平或高电平HPD信号。
在一优选实施例中，所述控制模块30可采用MCU控制芯片实现，MCU控制芯片具有信号控制脚、检测信号接收脚D及开关控制脚O/F，其中，信号控制脚用于输出方波信号控制脚至方波信号输出单元21的输入端；检测信号接收脚D用于接收检测信号触发单元22的输出端输出的检测信号；开关控制脚O/F用于输出控制信号以控制开关模块50动作。
参照图3，在一优选实施例中，所述开关模块50包括第一开关单元51及第二开关单元52，所述第一开关单元51的输入端与所述控制模块30连接，所述第一开关单元51的输出端与所述第二开关单元52的受控端连接；所述第二开关单元52的输入端与所述电源模块40连接，所述第二开关单元52的输出端与所述公共电源脚VCC连接。
本实施例中，通过设置第一开关单元51及第二开关单元52二级开关以提高开关响应速度。
参照图3，进一步地，所述第一开关单元51包括第二三极管Q2、第五电阻R5、第六电阻R6及第五电容C5，所述第五电阻R5的第一端为所述第一开关单元51的输入端，所述第五电阻R5的第二端与所述第六电阻R6的第一端、第五电容C5的第一端及所述第二三极管Q2的基极互连；所述五电容的第二端与所述第五电阻R5的第二端连接，并接地；所述第二三极管Q2的集电极与所述第二开关单元52的受控端连接；所述第二三极管Q2的发射极接地。
本实施例中，当第二三极管Q2的基极接收到控制模块30输出的控制信号时，第一三极管Q1导通/截止，从而触发第二开关单元52动作。
参照图3，进一步地，所述第二开关单元52包括第七电阻R7、第八电阻R8、第六电容C6及MOS管QW1，所述第七电阻R7的第一端为所述第二开关单元52的受控端，并与所述第八电阻R8的第一端连接，所述第七电阻R7的第二端与所述MOS管QW1的栅极及所述第六电容C6的第一端连接；所述第八电阻R8的第二端为所述第二开关单元52的输入端，并与所述第六电容C6的第二端及所述MOS管QW1的源极互连；所述MOS管QW1的漏极为所述第二开关单元52的输出端。
本实施例中，当MOS管QW1的栅极经第七电阻R7接收到第一开关单元51输出的触发信号时，MOS管QW1导通，从而使得电源模块40经MOS管QW1通过所述HDMI接口10给所述从设备供电。
为了更好地说明本发明的思想，以下结合图2及图3对本发明电路的具体原理进行阐述：
如附图2及附图3，在主设备的HDMI接口10与从设备连接时，MCU控制芯片经信号控制脚输出方波信号控制信号以控制第一电压源V1输出不同的周期的方波信号，该方波信号经第一电阻R1及第一电容C1组成积分电路将方波信号转换成锯齿波信号后经HDMI接口10的HPD传输脚HPD输出至从设备的HPD信号端，若检测到从设备的HPD信号端设置有谐振电路，且该谐振电路接收到锯齿波信号，并产生谐振时，该谐振信号经第三电容C3耦合至第一三极管Q1的基极，同时第二电压源V2输出的电压信号经第二电阻R2及第三电阻R3进行分压后，输出至第一三极管Q1的基极，这样，在谐振信号的正相期间，谐振信号与第二电压源V2输出的电压信号进行叠加之后以使第一三极管Q1导通，第一三极管Q1导通后，第一三极管Q1的集电极的电平被拉低而输出一低电平信号至MCU控制芯片的检测信号接收脚D，MCU控制芯片在接收到该检测信号后，经开关控制脚O/F输出开启信号至第二三极管Q2的基极，以使第一三极管Q1导通，进而触发MOS管QW1导通，以控制电源模块40经HDMI接口10的电源公共脚VCC给接入的从设备供电，同时，电源模块40还通过电源公共脚VCC输出电源至主设备的HPD信号相关电路以提供上拉电源，和/或输出电源至主设备的EDID存储模块以为供电EDID存储模块。
若检测到从设备的HPD信号端未设置有谐振电路，怎可以判定该从设备自身具有独立的供电电源，此时MCU控制芯片经开关控制脚O/F输出关闭信号至第二三极管Q2的基极，以使第一三极管Q1截止，进而触发MOS管QW1截止，以控制电源模块40经HDMI接口10的电源公共脚VCC停止给接入的从设备供电。此时，从设备的供电机制将通过电源公共脚VCC输出电源至主设备的HPD信号相关电路以提供上拉电源，和/或输出电源至主设备的EDID存储模块以为供电EDID存储模块。
可以理解的是，在主设备的HDMI接口10与从设备连接时，第一电压源V1输将输出连续且周期不同的方波信号，从而通过该从设备是否设置有谐振电路来判断该从设备是否设置有独立的供电电源，并在未设置供电电源时给从设备供电。同时，还通过输出连续且周期不同的方波信号来检测未设置独立供电电源的从与设置有独立供电电源的从设备之间进行切换时，及时控制电源模块40停止给从设备供电。
参照图4，基于上述主设备的HDMI接口电路，本发明还提出一种主设备基于HDMI接口给从设备供电的方法，该控制方法包括以下步骤：
S10、在主设备的HDMI接口有从设备接入时，检测所述从设备的谐振信号，并在检测到所述谐振信号时输出相应的检测信号；
本实施例中，从设备分为设有独立的供电电源及未设置独立的供电电源两种，当从设备上设置有独立的供电电源，在与主设备进行数据传输时，可以通过HDMI接口为主设备的HPD信号相关电路提供上拉电源以及为主设备的EDID存储模块等供电。当从设备上未设置独立的供电电源，在与主设备进行数据传输时，需要主设备给其供电才能正常工作，而在未设置有独立的供电电源的从设备上均配置有谐振电路。这样，当主设备的HDMI接口接入有从设备时，主设备可以通过检测从设备上谐振电路输出的谐振信号来确定接入的从设备上未设置有独立电源，并在从设备未设置独立电源时给从设备供电，而在未检测从设备上输出的谐振信号来，确定接入的从设备上设置有独立电源，则不需要给该从设备供电。
当主设备的HDMI接口监测到有从设备接入时，检测从设备上的谐振信号的有无从而判断从设备上是否设置有谐振电路，若检测到该谐振信号，则判定该从设备设置有谐振电路，即该从设备未设置独立的供电电源，并输出相应的检测信号，且该检测信号即为谐振电路输出的一次谐振信号。若未检测到该谐振信号，则判定该从设备未设置谐振电路，即该从设备设置有独立的供电电源，输出相应的检测信号。
S20、在接收到所述检测信号时，输出电源至所述HDMI接口10，以给所述从设备供电。
当接收到检测到谐振信号的检测信号时，便可以确定该从设备未设置独立的供电电源，主设备经HDMI接口10将电源输出至该从设备，以给该从设备供电，实现数据传输。
当接收到未检测到谐振信号的检测信号时，便可以确定该从设备设置独立的供电电源，主设备无需经HDMI接口将电源输出至该从设备。
本发明主设备基于HDMI接口给从设备供电的方法在主设备的HDMI接口与从设备连接时，对从设备进行检测，且当检测到所述从设备输出的谐振信号时，输出相应的检测信号，以经HDMI接口给接入的从设备供电。这样，便可在与未设置独立的供电电源的从设备进行数据传输时，未设置独立供电电源的从设备供电，以实现主设备通过HDMI接口给从设备供电，使从设备不再需要单独配置电源，从而减少从设备的体积，使之更小型化。
参照图5，进一步地，所述在主设备的HDMI接口有从设备接入时，检测所述从设备的谐振信号，并在检测到所述谐振信号时输出相应的检测信号的步骤S10包括：
S11、在主设备的HDMI接口有从设备接入时，依次输出多个预设周期的方波信号至所述HDMI接口，以供所述从设备的谐振信号触发；
需要说明的是，未设置独立供电电源的从设备上均设置有谐振电路，且每一谐振电路本身均具有一个特定谐振频率，该频率由电路元件参数决定，一般是L、C的参数。当外部输入的信号的频率与电路谐振频率相等或相近时，电路表现的总体阻抗较小，这样，当方波信号频率等于谐振频率时，电路阻抗最小，即触发了从设备的谐振信号。
主设备上预先设置有多个周期不同的方波信号，当监测到主设备的HDMI接口有从设备接入时，便输出不同周期的方波信号至HDMI接口的HPD信号端，在从设备设置有谐振电路时，以触发从设备上的谐振电路产生谐振信号。
此外，当监测到主设备的HDMI接口有从设备接入时，主设备上预先设置有多个周期不同的方波信号将周期性的输出，以在未设置独立电源的从设备与设置有独立电源的从设备之间进行切换时能够及时监控到，同时还可以提高检测信号的准确性。
S12、当所述主设备的HDMI接口接收到所述从设备的谐振信号时，输出所述检测信号。
当检测到从设备上的谐振电路产生谐振信号时，则确定主设备的HDMI接口10接入的从设备未设置独立的供电电源，则输出相应的检测信号。
综上，本发明主设备基于HDMI接口给从设备供电的方法在主设备的HDMI接口与从设备连接时，依次输出多个预设周期的方波信号至所述HDMI接口以供所述从设备的谐振信号触发，且当检测到所述从设备输出的谐振信号时，输出相应的检测信号，进而经HDMI接口给接入的从设备供电。这样，便可在与未设置独立的供电电源的从设备进行数据传输时，未设置独立供电电源的从设备供电，以实现主设备通过HDMI接口给从设备供电，使从设备不再需要单独配置电源，从而减少从设备的体积，使之更小型化。
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是在本发明的发明构思下，利用本发明说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本发明的专利保护范围内。

Claims (13)

  1. 一种主设备的HDMI接口电路，其特征在于，包括：
    HDMI接口；
    开关模块，所述开关模块的输出端与所述HDMI接口连接；
    电源模块，经所述开关模块与所述HDMI接口连接；
    检测模块，用于在所述HDMI接口接入从设备时，检测所述从设备的谐振信号，并在检测到所述谐振信号时输出相应的检测信号；
    控制模块，用于在接收到所述检测信号时，控制所述开关模块开启，以控制所述电源模块通过所述HDMI接口给所述从设备供电。
  2. 如权利要求1所述的主设备的HDMI接口电路，其特征在于，所述HDMI接口包括HPD信号传输脚及用于给所述主设备的其他电路和从设备提供电源的公共电源脚，所述公共电源脚经所述开关模块与所述电源模块的输出端连接；所述HPD信号传输脚与所述主设备的HPD信号端连接。
  3. 如权利要求1所述的主设备的HDMI接口电路，其特征在于，所述检测模块包括：
    方波信号输出单元，用于在主设备的HDMI接口有从设备接入时，依次输出多个预设周期的方波信号至所述HDMI接口，以供所述从设备的谐振信号触发；
    检测信号触发单元，用于当所述主设备的HDMI接口接收到所述从设备的谐振信号时，输出所述检测信号。
  4. 如权利要求3所述的主设备的HDMI接口电路，其特征在于，所述方波信号输出单元包括第一电压源、第一电阻、第一电容及第二电容，所述第一电压源的正极输出端与所述第一电阻的第一端连接，所述第一电压源的负极输出端接地；所述第一电阻的第二端与所述第一电容的第一端及所述第二电容的第一端互连；所述第一电容的第二端接地；所述第二电容的第二端与所述主设备的HPD信号端连接。
  5. 如权利要求3所述的主设备的HDMI接口电路，其特征在于，所述检测信号触发单元包括第二电压源、第一三极管、第二电阻、第三电阻、第四电阻、第三电容及第四电容，所述第三电容的第一端为所述检测信号触发单元的输入端，所述第三电容的第二端与所述第一三极管的基极、第二电阻的第一端及所述第三电阻的第一端互连；所述第二电阻的第二端接地；所述第一三极管的集电极为所述检测信号触发单元的输出端，并与所述第四电阻的第一端及所述第四电容的第一端及所述第四电容的第一端互连，所述第一三极管的发射极接地；所述第三电阻的第二端与所述第四电阻的第二端、第四电容的第二端及所述第二电压源的正极输出端互连；所述第二电压源的负极输出端接地。
  6. 如权利要求2所述的主设备的HDMI接口电路，其特征在于，所述检测模块包括：
    方波信号输出单元，用于在主设备的HDMI接口有从设备接入时，依次输出多个预设周期的方波信号至所述HDMI接口，以供所述从设备的谐振信号触发；
    检测信号触发单元，用于当所述主设备的HDMI接口接收到所述从设备的谐振信号时，输出所述检测信号。
  7. 如权利要求6所述的主设备的HDMI接口电路，其特征在于，所述方波信号输出单元包括第一电压源、第一电阻、第一电容及第二电容，所述第一电压源的正极输出端与所述第一电阻的第一端连接，所述第一电压源的负极输出端接地；所述第一电阻的第二端与所述第一电容的第一端及所述第二电容的第一端互连；所述第一电容的第二端接地；所述第二电容的第二端与所述主设备的HPD信号端连接。
  8. 如权利要求6所述的主设备的HDMI接口电路，其特征在于，所述检测信号触发单元包括第二电压源、第一三极管、第二电阻、第三电阻、第四电阻、第三电容及第四电容，所述第三电容的第一端为所述检测信号触发单元的输入端，所述第三电容的第二端与所述第一三极管的基极、第二电阻的第一端及所述第三电阻的第一端互连；所述第二电阻的第二端接地；所述第一三极管的集电极为所述检测信号触发单元的输出端，并与所述第四电阻的第一端及所述第四电容的第一端及所述第四电容的第一端互连，所述第一三极管的发射极接地；所述第三电阻的第二端与所述第四电阻的第二端、第四电容的第二端及所述第二电压源的正极输出端互连；所述第二电压源的负极输出端接地。
  9. 如权利要求2所述的主设备的HDMI接口电路，其特征在于，所述开关模块包括第一开关单元及第二开关单元，所述第一开关单元的输入端与所述控制模块连接，所述第一开关单元的输出端与所述第二开关单元的受控端连接；所述第二开关单元的输入端与所述电源模块连接，所述第二开关单元的输出端与所述公共电源脚连接。
  10. 如权利要求9所述的主设备的HDMI接口电路，其特征在于，所述第一开关单元包括第二三极管、第五电阻、第六电阻及第五电容，所述第五电阻的第一端为所述第一开关单元的输入端，所述第五电阻的第二端与所述第六电阻的第一端、第五电容的第一端及所述第二三极管的基极互连；所述五电容的第二端与所述第五电阻的第二端连接，并接地；所述第二三极管的集电极与所述第二开关单元的受控端连接；所述第二三极管的发射极接地。
  11. 如权利要求9所述的主设备的HDMI接口电路，其特征在于，所述第二开关单元包括第七电阻、第八电阻、第六电容及MOS管，所述第七电阻的第一端为所述第二开关单元的受控端，并与所述第八电阻的第一端连接，所述第七电阻的第二端与所述MOS管的栅极及所述第六电容的第一端连接；所述第八电阻的第二端为所述第二开关单元的输入端，并与所述第六电容的第二端及所述MOS管的源极互连；所述MOS管的漏极为所述第二开关单元的输出端。
  12. 一种主设备基于HDMI接口给从设备供电的方法，其特征在于，所述主设备基于HDMI接口给从设备供电的方法的步骤包括：
    在主设备的HDMI接口有从设备接入时，检测所述从设备的谐振信号，并在检测到所述谐振信号时输出相应的检测信号；
    在接收到所述检测信号时，输出电源至所述HDMI接口，以给所述从设备供电。
  13. 如权利要求12所述的主设备基于HDMI接口给从设备供电的方法，其特征在于，所述在主设备的HDMI接口有从设备接入时，检测所述从设备的谐振信号，并在检测到所述谐振信号时输出相应的检测信号的步骤包括：
    在主设备的HDMI接口有从设备接入时，依次输出多个预设周期的方波信号至所述HDMI接口，以供所述从设备的谐振信号触发；
    当所述主设备的HDMI接口接收到所述从设备的谐振信号时，输出所述检测信号。
PCT/CN2016/112830 2016-11-09 2016-12-29 主设备的hdmi接口电路及基于hdmi接口给从设备供电的方法 Ceased WO2018086221A1 (zh)

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