CN114253191A - HDMI (high-definition multimedia interface) reverse power supply circuit and power supply method - Google Patents
HDMI (high-definition multimedia interface) reverse power supply circuit and power supply method Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- 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
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
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Abstract
The invention discloses a reverse power supply circuit and a power supply method for an HDMI interface. It includes: the control chip U1 comprises a voltage detection end and a control end, wherein the voltage detection end is used for receiving voltage information from the cable, and the control end is used for sending a control signal according to the voltage information; the voltage detection circuit comprises a test end and a voltage information sending end, wherein the test end is used for being electrically connected with the HDMI socket, the HDMI socket is used for being connected with a cable, and the voltage information sending end is electrically connected with the voltage detection end of the control chip U1, so that the voltage detection end obtains voltage information from the signal source end through the test end of the voltage detection circuit; the switch circuit comprises a power input end, a voltage output end and a controlled end, wherein the power input end is electrically connected with a 5V power supply, the voltage output end is used for outputting 5V voltage, the voltage output end is electrically connected with a test end and is electrically connected with an HDMI seat, and the controlled end is electrically connected with a control end of a control chip U1. The invention has the effect of conveniently supplying power to the input interface of the HDMI.
Description
Technical Field
The invention relates to the field of reverse power supply of an HDMI (high-definition multimedia interface), in particular to a reverse power supply circuit and a power supply method of the HDMI.
Background
The high-definition multimedia interface, HDMI, is a fully digital video and audio transmission interface that can transmit uncompressed audio and video signals. The HDMI can be used for set-top boxes, DVD players, personal computers, televisions, game hosts, comprehensive amplifiers, digital stereos, televisions and other equipment. HDMI can send audio frequency and video signal simultaneously, because audio frequency and video signal adopt same wire rod, simplifies the installation degree of difficulty of system's circuit greatly.
In the related art, for the input interface of the HDMI, according to the specification of the HDMI, the input interface is only a power receiving terminal, and only 5V current within 50mA supplied from the signal source device terminal is taken. With the upgrading of the HDMI specification, the bandwidth speed is higher, and for HDMI2.0, especially HDMI2.1, the 48G signal of the conventional pure copper cable HDMI cable for transmitting HDMI2.1 can only be transmitted over a distance of no more than 5m, and the requirement for the cable is high. For the optical transmission mode, a power adapter is additionally added to the input interface of the HDMI to supply power to the input interface of the HDMI, so that the signal transmission with high bandwidth and high speed can be transmitted remotely.
In view of the above related technologies, the inventor believes that the power adapter is added to the input interface of the HDMI to supply power to the input interface of the HDMI, which is easy to complicate system installation and causes a defect that it is inconvenient to supply power to the input interface of the HDMI.
Disclosure of Invention
In order to supply power to the input interface of the HDMI, the application discloses a reverse power supply circuit and a power supply method for the HDMI.
In a first aspect, the present application discloses a reverse power supply circuit for an HDMI interface, which adopts the following technical scheme:
an HDMI interface reverse power supply circuit comprising:
the control chip U1 comprises a voltage detection end and a control end, wherein the voltage detection end is used for receiving voltage information from the cable, and the control end is used for sending a control signal according to the voltage information;
the voltage detection circuit comprises a test end and a voltage information sending end, wherein the test end is used for being electrically connected with the HDMI socket, the HDMI socket is used for being connected with a cable, and the voltage information sending end is electrically connected with the voltage detection end of the control chip U1, so that the voltage detection end obtains voltage information from the signal source end through the test end of the voltage detection circuit, and the power supply capacity of the signal source end is judged conveniently;
switch circuit, including power input end, voltage output end and controlled end, power input end is used for being connected with 5V power electricity, voltage output end is used for exporting 5V voltage, voltage output end and test end electric connection just are used for being connected with HDMI seat electron, controlled end and control chip U1's control end electric connection for receiving control signal, so that control voltage output end exports 5V voltage or stops voltage output end exports 5V voltage.
Through adopting above-mentioned technical scheme, the voltage detection end of control chip U1 passes through the voltage detection circuit and detects the voltage information who comes from the cable to control chip U1 generates control signal according to voltage information, thereby according to control signal control switch circuit, is favorable to realizing that the 5V power supplies power or stops the power supply to the input interface of HDMI automatically, thereby is convenient for the input interface power supply of HDMI.
Optionally, the voltage detection circuit includes a second capacitor C2, a fourth resistor R4, and a fifth resistor R5, one end of the second capacitor C2 is a test end and is electrically connected to the voltage output end of the switch circuit, one end of the second capacitor C2 is electrically connected to the HDMI socket, and the other end of the second capacitor C2 is grounded;
one end of the fourth resistor R4 is connected to one end of the second capacitor C2 as a test end, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5 and a voltage detection end of the control chip U1, and the other end of the fifth resistor R5 is grounded.
Through adopting above-mentioned technical scheme, be favorable to accurate and detect the voltage of cable fast to in obtaining voltage information, thereby be convenient for HDMI's input interface power supply.
Optionally, the switch circuit includes a transistor Q1, a field effect transistor Q2, and a third resistor R3, the transistor Q1 is an NPN-type transistor, the transistor Q2 is a P-channel enhancement type transistor, a base of the transistor Q1 is connected to a control end of the control chip U1, an emitter of the transistor Q1 is grounded, and a collector of the transistor Q1 is connected to one end of the third resistor R3 and a gate of the transistor Q2;
the other end of the third resistor R3 is connected with a 5V power supply and the source electrode of a field effect transistor Q2, the 5V power supply is connected with a first capacitor C1, one end of the first capacitor C1 is connected with the source electrode of the field effect transistor Q2 and the third resistor R3, and the other end of the first capacitor C1 is grounded;
the drain of the fet Q2 is electrically connected to the HDMI socket as a voltage output terminal, at the end of the fourth resistor R4 remote from the fifth resistor R5, at the end of the second capacitor C2 remote from the ground.
By adopting the technical scheme, the control end controls the triode Q1 to be switched on or switched off according to the control signal, when the control end sends out a high level, the triode Q1 is switched on, so that the grid level of the field effect transistor Q2 becomes low, the field effect transistor Q2 is switched on, and the 5V power supply supplies power for the HDMI socket through the voltage output end, thereby being convenient for supplying power for the input interface of the HDMI.
Optionally, an overcurrent protection circuit for protecting the circuit is coupled between the switch circuit and the test end, a drain of the fet Q2 is electrically connected to an input end of the overcurrent protection circuit, and an output end of the overcurrent protection circuit is electrically connected to one end of the fourth resistor R4, which is far away from the fifth resistor R5, one end of the second capacitor C2, which is far away from the HDMI socket.
Through adopting above-mentioned technical scheme, when the cable current was too big unusually appears, overcurrent protection circuit can the break circuit to protect inside circuit.
Optionally, the overcurrent protection circuit includes a diode D1 and a fuse F1, an anode of the diode D1 is connected to the drain of the fet Q2, a cathode of the diode D1 is connected to one end of the fuse F1, and the other end of the fuse F1 is electrically connected to one end of the fourth resistor R4, which is far away from the fifth resistor R5, one end of the second capacitor C2, which is far away from the HDMI socket.
Through adopting above-mentioned technical scheme, diode D1 is provided with and is favorable to the protection circuit, and fuse F1's setting is favorable to the broken circuit when overflowing, further protects the circuit.
Optionally, a current detection circuit is coupled between the HDMI socket and the fuse F1, and the current detection circuit is electrically connected to the control chip U1, so that the control chip U1 controls the control signal according to the current change and the voltage change of the cable.
Through adopting above-mentioned technical scheme, current detection circuit be provided with do benefit to the electric current that accurately detects the cable and transmit to control chip U1 to control chip U1 obtains the current information of cable, thereby is convenient for adjust control signal, thereby is convenient for supply power for HDMI's input interface.
Optionally, the current detection circuit includes a monitoring chip U2, a third capacitor C3, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8, the model of the monitoring chip U2 is INA226, the monitoring chip U2 is electrically connected to the control chip U1 through an I2C bus, two ends of the third capacitor C3 are respectively connected to the ninth pin and the tenth pin of the monitoring chip U2, one end of the sixth resistor R6 is connected to the tenth pin of the monitoring chip U2, two ends of the third capacitor C3 and one end of the seventh resistor R7, and the other end of the sixth resistor R6 is connected to one end of the fourth resistor R4 away from the fifth resistor R5, one end of the second capacitor C2 away from ground and one end of a fuse F1 away from the diode D1;
the other end of the seventh resistor R7 is connected to the other end of the eighth resistor R8 and the HDMI socket.
Through adopting above-mentioned technical scheme, monitor chip U2 carries out real time monitoring to the electric current of cable to with electric current information transmission to control chip U1, thereby be favorable to accurately monitoring electric current.
Optionally, a first resistor R1 and a second resistor R2 are coupled between the base of the transistor Q1 and the control end of the control chip U1, one end of the second resistor R2 is connected to the control end of the control chip U1 and one end of the first resistor R1, the other end of the second resistor R2 is grounded, and the other end of the first resistor R1 is connected to the base of the transistor Q1.
By adopting the technical scheme, the arrangement of the first resistor R1 and the second resistor R2 is beneficial to improving the stability of the high level output by the control end of the control chip U1 and is beneficial to protecting the circuit.
In a second aspect, the application discloses a method for reverse power supply of an HDMI interface, which adopts the following technical scheme:
an HDMI reverse power supply method comprises the following steps:
selecting to enable an automatic mode or a manual mode;
starting the automatic mode, and automatically controlling the state of reverse power supply according to the automatic mode;
starting the manual mode, and controlling the state of reverse power supply according to the manual mode;
and when the automatic mode is started, automatically controlling the state of reverse power supply according to the automatic mode, wherein the state comprises the following steps:
acquiring voltage information and current information from a cable;
generating a control signal according to the voltage information and the current information;
and controlling the switching state of the switching circuit according to the control signal, so that the 5V power supply cable carries out reverse power supply or stops the reverse power supply.
Through adopting above-mentioned technical scheme, according to the load of difference, the user can choose the most suitable control mode for use, during automatic mode, automatic collection voltage information and current information, and then be favorable to generating control signal fast to be convenient for control switch circuit's on-off state, so that for HDMI's input interface power supply.
Optionally, the generating a control signal according to the voltage information and the current information includes:
judging whether the voltage information is less than 5V or not, and simultaneously judging whether the current information jumps to 0 or not; if the voltage information is less than 5V and the current information has no jump to 0, generating a control signal for driving the switching circuit to be changed from a disconnected state to a connected state; if the voltage is less than 5V and the current information jumps to 0, a control signal is generated to drive the switching circuit from the on state to the off state.
By adopting the technical scheme, the simultaneous judgment form is favorable for realizing double-parameter control, so that the control signal is generated more accurately, the on-off state of the switch circuit is convenient to control, and the power is supplied to the input interface of the HDMI.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the voltage detection end of the control chip U1 detects voltage information from the cable through the voltage detection circuit, so that the control chip U1 generates a control signal according to the voltage information, the switch circuit is controlled according to the control signal, the 5V power supply can be automatically supplied to the input interface of the HDMI or stop supplying power, and the power supply for the input interface of the HDMI is facilitated.
2. The control end controls the triode Q1 to be switched on or switched off according to the control signal, when the control end sends out a high level, the triode Q1 is switched on, so that the grid level of the field effect transistor Q2 becomes low, the field effect transistor Q2 is switched on, and the 5V power supply supplies power for the HDMI socket through the voltage output end, thereby being convenient for supplying power for the input interface of the HDMI.
3. According to different loads, a user can select the most suitable control mode, and during the automatic mode, the voltage information and the current information are automatically collected, so that the control signal can be generated rapidly, the on-off state of the switch circuit can be controlled conveniently, and the power can be supplied to the input interface of the HDMI conveniently.
Drawings
Fig. 1 is a schematic circuit connection diagram of an HDMI interface reverse power supply circuit according to an embodiment of the present application.
Fig. 2 is a schematic flow chart illustrating a method for applying a reverse power supply method for an HDMI interface according to an embodiment of the present invention.
Reference numerals: 1. a voltage detection circuit; 2. a switching circuit; 3. an overcurrent protection circuit; 4. a current detection circuit.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
Referring to fig. 1, the present application discloses an HDMI interface reverse power supply circuit.
An HDMI interface reverse power supply circuit comprising:
the control chip U1 comprises a voltage detection end and a control end, wherein the voltage detection end is used for receiving voltage information from the cable, and the control end is used for sending a control signal according to the voltage information;
the voltage detection circuit 1 comprises a test end and a voltage information sending end, wherein the test end is used for being electrically connected with an HDMI seat, the HDMI seat is used for being connected with a cable, and the voltage information sending end is electrically connected with a voltage detection end of the control chip U1, so that the voltage detection end obtains voltage information from a signal source end through the test end of the voltage detection circuit 1, and the power supply capacity of the signal source end can be judged conveniently;
switch circuit 2, including power input end, voltage output end and controlled end, power input end is used for being connected with the 5V power electricity, and voltage output end is used for exporting 5V voltage, and voltage output end is connected with the test end electricity and is used for being connected with HDMI seat electron electricity, and controlled end is connected with control end electricity of control chip U1 for receive control signal, so that control voltage output end exports 5V voltage or stops voltage output end to export 5V voltage.
Specifically, the voltage detection circuit 1 includes a second capacitor C2, a fourth resistor R4, and a fifth resistor R5, one end of the second capacitor C2 is a test terminal and is electrically connected to the voltage output terminal of the switch circuit 2, one end of the second capacitor C2 which is the test terminal is connected to the HDMI socket, and the other end of the second capacitor C2 is grounded. One end of the fourth resistor R4 is connected to one end of the second capacitor C2 as a test end, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5 and a voltage detection end of the control chip U1, and the other end of the fifth resistor R5 is grounded. It should be noted that the control chip U1 is an MCU chip with an analog-to-digital converter (ADC). In this embodiment, a control chip U1 with a model number of EFM8BB1 is used. The voltage detection end of the control chip U1 is an ADC pin of the MCU chip, namely a level detection pin, and is used for detecting the level of the cable.
The switch circuit 2 comprises a triode Q1, a field effect transistor Q2 and a third resistor R3, wherein the triode Q1 is an NPN type triode, and the field effect transistor Q2 is a P-channel enhancement type field effect transistor. The base of the triode Q1 is connected with the control end of the control chip U1, and the control end is one of the I/O ports of the control chip U1 and is used for controlling external enabling. The emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to one end of the third resistor R3 and the gate of the fet Q2. The other end of the third resistor R3 is connected with a 5V power supply and the source electrode of the field effect transistor Q2, the 5V power supply is connected with a first capacitor C1, one end of the first capacitor C1 is connected with the source electrode of the field effect transistor Q2 and the third resistor R3, and the other end of the first capacitor C1 is grounded. The drain of the fet Q2 is electrically connected as a voltage output terminal to the HDMI socket at the end of the fourth resistor R4 remote from the fifth resistor R5, at the end of the second capacitor C2 remote from the ground.
A first resistor R1 and a second resistor R2 are coupled between the base of the transistor Q1 and the control end of the control chip U1, one end of the second resistor R2 is connected to the control end of the control chip U1 and one end of the first resistor R1, the other end of the second resistor R2 is grounded, and the other end of the first resistor R1 is connected to the base of the transistor Q1.
An overcurrent protection circuit 3 for protecting the circuit is coupled between the switch circuit 2 and the test end, the drain of the field effect transistor Q2 is electrically connected with the input end of the overcurrent protection circuit 3, and the output end of the overcurrent protection circuit 3 is electrically connected with one end of the fourth resistor R4 far away from the fifth resistor R5, one end of the second capacitor C2 far away from the ground and the HDMI socket.
The overcurrent protection circuit 3 comprises a diode D1 and a fuse F1, wherein the anode of the diode D1 is connected with the drain of the fet Q2, the cathode of the diode D1 is connected with one end of the fuse F1, and the other end of the fuse F1 is electrically connected with one end of the fourth resistor R4 far away from the fifth resistor R5, one end of the second capacitor C2 far away from the HDMI socket.
The control chip U1 further includes an I2C bus interface, and the control chip U1 is coupled with a current detection circuit 4 for detecting the current of the cable through an I2C bus, so that the control chip U1 controls the control signal according to the current change and the voltage change of the cable.
The current detection circuit 4 includes a monitor chip U2, a third capacitor C3, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8, and the monitor chip U2 is model INA 226. The monitoring chip U2 is electrically connected with an I2C bus interface of the control chip U1 through an I2C bus, two ends of a third capacitor C3 are respectively connected with a ninth pin and a tenth pin of the monitoring chip U2, one end of a sixth resistor R6 is connected with the tenth pin of the monitoring chip U2, two ends of the third capacitor C3 and one end of a seventh resistor R7, and the other end of the sixth resistor R6 is connected with one end of a fourth resistor R4 far away from the fifth resistor R5, one end of a second capacitor C2 far away from the diode D1 and one end of a fuse F1 far away from the diode D1. The other end of the seventh resistor R7 is connected to the other end of the eighth resistor R8 and the HDMI socket.
It should be noted that in this embodiment, the HDMI socket is an HDMI socket with an a-type port, and one end of the eighth resistor R8 close to the seventh resistor R7 is connected to the eighteenth pin of the HDMI socket.
In summary, when the load is connected to the HDMI socket through the cable, the voltage detection circuit 1 detects the voltage of the cable, and the current detection circuit 4 detects the current of the cable, the ADC pin of the control chip U1 receives the voltage information from the voltage detection circuit 1, and the control chip U1 receives the current information from the monitor chip U2 through the I2C bus, so that the control chip U1 generates a corresponding control signal according to the voltage information and the current information. If the voltage of the cable is less than 5V and the load is connected, the control signal is high level, the triode Q1 is conducted, so that the voltage at the grid electrode of the field effect transistor Q2 is less than the voltage at the source electrode, the field effect transistor Q2 is conducted, the voltage of the drain electrode is equal to that of the source electrode, and one end of the PWR5V1 supplies power to the cable in the reverse direction of 5V through the HDMI socket. If the load is pulled out, the current of the cable jumps to 0, the control signal changes to low level, so that the triode Q1 is cut off, the field effect transistor Q2 is also cut off, and the reverse power supply is stopped. The above process facilitates power supply to the input interface of the HDMI.
Referring to fig. 2, an embodiment of the present application further discloses a method for reverse power supply of an HDMI interface.
An HDMI reverse power supply method comprises the following steps:
and S1, selecting to enable the automatic mode or the manual mode.
Specifically, the control chip U1 is programmed, and the initial output of the control terminal is at a low level in the automatic mode and at a high level in the manual mode.
And S2, starting the automatic mode, and automatically controlling the reverse power supply state according to the automatic mode.
Specifically, voltage information and current information from the cable are acquired; generating a control signal according to the voltage information and the current information; and controlling the switching state of the switching circuit according to the control signal, so that the 5V power supply cable carries out reverse power supply or stops the reverse power supply.
The control chip U1 obtains the voltage information and the current information of the cable through the voltage detection circuit and the current detection circuit. Generating a control signal according to the voltage information and the current information, comprising: judging whether the voltage information is less than 5V or not, and simultaneously judging whether the current information jumps to 0 or not; if the voltage information is less than 5V and the current information has no jump to 0, generating a control signal for driving the switching circuit to be changed from a disconnected state to a connected state; if the voltage is less than 5V and the current information jumps to 0, a control signal is generated to drive the switching circuit from the on state to the off state.
The control signal that drives the switching circuit from the off state to the on state is a high level, and the control signal that drives the switching circuit from the on state to the off state is a low level.
And S3, enabling the manual mode, and controlling the state of reverse power supply according to the manual mode.
Specifically, the manual mode is suitable for when the load is an optical transceiver, and if the optical transceiver is not powered, the voltage detection circuit cannot detect the voltage, so that the manual mode needs to be set, once the manual mode is entered, the control terminal outputs a high level, and the optical transceiver is forced to be powered reversely to supply power to the optical transceiver, so that the optical transceiver does not need an additional voltage adapter. When the optical transmitter and receiver is pulled out, the current detection circuit detects that the current of the cable jumps to 0, so that the control signal is changed to low level, namely the control end outputs low level, and then the reverse power supply is stopped.
In summary, when the automatic mode is enabled, the voltage detection circuit and the current detection circuit are both enabled, and the control chip U1 receives the voltage information and the current information, and then controls the state of the switch circuit through different control signals, so as to realize automatic reverse power supply. When the manual mode is started, the forced reverse power supply is realized, the current detection circuit monitors whether the load is pulled out or not in real time, and if the load is pulled out, the state of the switch circuit is controlled by changing the control signal, so that the power supply is stopped.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. An HDMI interface reverse power supply circuit, comprising:
the control chip U1 comprises a voltage detection end and a control end, wherein the voltage detection end is used for receiving voltage information from the cable, and the control end is used for sending a control signal according to the voltage information;
the voltage detection circuit (1) comprises a test end and a voltage information sending end, wherein the test end is used for being electrically connected with an HDMI seat, the HDMI seat is used for being connected with a cable, and the voltage information sending end is electrically connected with a voltage detection end of a control chip U1, so that the voltage detection end obtains voltage information from a signal source end through the test end of the voltage detection circuit (1) to judge the power supply capacity of the signal source end;
switch circuit (2), including power input end, voltage output end and controlled end, power input end is used for being connected with 5V power electricity, voltage output end is used for exporting 5V voltage, voltage output end and test end electric connection just are used for being connected with HDMI seat electricity, the controlled end is connected with control chip U1's control end electricity for receive control signal, so that control voltage output end exports 5V voltage or stops voltage output end exports 5V voltage.
2. An HDMI interface reverse power supply circuit according to claim 1, wherein: the voltage detection circuit (1) comprises a second capacitor C2, a fourth resistor R4 and a fifth resistor R5, wherein one end of the second capacitor C2 is a test end and is electrically connected with the voltage output end of the switch circuit (2), one end of the second capacitor C2 which is the test end is electrically connected with the HDMI socket, and the other end of the second capacitor C2 is grounded;
one end of the fourth resistor R4 is connected to one end of the second capacitor C2 as a test end, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5 and a voltage detection end of the control chip U1, and the other end of the fifth resistor R5 is grounded.
3. An HDMI interface reverse power supply circuit according to claim 2, wherein: the switching circuit (2) comprises a triode Q1, a field effect transistor Q2 and a third resistor R3, wherein the triode Q1 is an NPN type triode, the field effect transistor Q2 is a P-channel enhanced field effect transistor, the base electrode of the triode Q1 is connected with the control end of a control chip U1, the emitting electrode of the triode Q1 is grounded, and the collector electrode of the triode Q1 is connected with one end of the third resistor R3 and the grid electrode of the field effect transistor Q2;
the other end of the third resistor R3 is connected with a 5V power supply and the source electrode of a field effect transistor Q2, the 5V power supply is connected with a first capacitor C1, one end of the first capacitor C1 is connected with the source electrode of the field effect transistor Q2 and the third resistor R3, and the other end of the first capacitor C1 is grounded;
the drain of the fet Q2 is electrically connected to the HDMI socket as a voltage output terminal, at the end of the fourth resistor R4 remote from the fifth resistor R5, at the end of the second capacitor C2 remote from the ground.
4. An HDMI interface reverse power supply circuit according to claim 3, wherein: an overcurrent protection circuit (3) for protecting the circuit is coupled between the switch circuit (2) and the test end, the drain of the field effect transistor Q2 is electrically connected with the input end of the overcurrent protection circuit (3), and the output end of the overcurrent protection circuit (3) is electrically connected with one end of the fourth resistor R4 far away from the fifth resistor R5, one end of the second capacitor C2 far away from the ground and the HDMI seat.
5. An HDMI interface reverse power supply circuit according to claim 4, wherein: the overcurrent protection circuit (3) comprises a diode D1 and a fuse F1, wherein the anode of the diode D1 is connected with the drain electrode of the field effect transistor Q2, the cathode of the diode D1 is connected with one end of the fuse F1, and the other end of the fuse F1 is electrically connected with one end, far away from the fifth resistor R5, of the fourth resistor R4, one end, far away from the second capacitor C2, of the second resistor R3524 and the HDMI socket.
6. An HDMI interface reverse power supply circuit according to claim 5, wherein: a current detection circuit (4) is coupled between the HDMI socket and the fuse F1, and the current detection circuit (4) is electrically connected with the control chip U1, so that the control chip U1 controls the control signal according to the current change and the voltage change of the cable.
7. An HDMI interface reverse power supply circuit according to claim 6, wherein: the current detection circuit (4) comprises a monitoring chip U2, a third capacitor C3, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8, wherein the model of the monitoring chip U2 is INA226, the monitoring chip U2 is electrically connected with the control chip U1 through an I2C bus, two ends of the third capacitor C3 are respectively connected with a ninth pin and a tenth pin of the monitoring chip U2, one end of the sixth resistor R6 is connected with a tenth pin of the monitoring chip U2, two ends of the third capacitor C3 and one end of the seventh resistor R7, and the other end of the sixth resistor R6 is connected with one end of the fourth resistor R4, which is far away from the fifth resistor R5, one end of the second capacitor C2, and one end of a fuse F1, which is far away from a diode D1;
the other end of the seventh resistor R7 is connected to the other end of the eighth resistor R8 and the HDMI socket.
8. An HDMI interface reverse power supply circuit according to claim 3, wherein: a first resistor R1 and a second resistor R2 are coupled between the base of the triode Q1 and the control end of the control chip U1, one end of the second resistor R2 is connected with the control end of the control chip U1 and one end of the first resistor R1, the other end of the second resistor R2 is grounded, and the other end of the first resistor R1 is connected with the base of the triode Q1.
9. A method for reversely supplying power to an HDMI interface comprises the following steps:
selecting to enable an automatic mode or a manual mode;
starting the automatic mode, and automatically controlling the state of reverse power supply according to the automatic mode;
starting the manual mode, and controlling the state of reverse power supply according to the manual mode;
and when the automatic mode is started, automatically controlling the state of reverse power supply according to the automatic mode, wherein the state comprises the following steps:
acquiring voltage information and current information from a cable;
generating a control signal according to the voltage information and the current information;
and according to the control signal, controlling the switching state of the switching circuit (2) to enable the 5V power supply cable to carry out reverse power supply or stop the reverse power supply.
10. The HDMI interface reverse power supply method of claim 9, wherein: the generating a control signal according to the voltage information and the current information includes:
judging whether the voltage information is less than 5V or not, and simultaneously judging whether the current information jumps to 0 or not; if the voltage information is less than 5V and the current information has no jump to 0, generating a control signal for driving the switch circuit (2) to be in a conducting state from a disconnecting state; if the voltage is less than 5V and the current information jumps to 0, a control signal is generated to drive the switch circuit (2) from the on state to the off state.
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