CN113905201B

CN113905201B - Session peripheral circuit and session system

Info

Publication number: CN113905201B
Application number: CN202111193292.1A
Authority: CN
Inventors: 安帅; 杨开沂; 范建根
Original assignee: Suzhou Keda Special Video Co ltd; Suzhou Keda Technology Co Ltd
Current assignee: Suzhou Keda Special Video Co ltd; Suzhou Keda Technology Co Ltd
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2024-01-26
Anticipated expiration: 2041-10-13
Also published as: CN113905201A

Abstract

The application comprises a session terminal circuit, a session peripheral circuit and a session system, and particularly relates to the technical field of video session. The session terminal circuit comprises a first voltage regulating circuit, a first protocol chip and a first Type C connector; the first protocol chip is electrically connected with a second CC pin of a second protocol chip in the session peripheral circuit through the first CC pin so as to acquire a voltage regulation request of the second protocol chip; the first protocol chip forwards the voltage regulation request to a first voltage regulation circuit, and the first voltage regulation circuit regulates the voltage according to the voltage regulation request and outputs the regulated voltage through an output voltage terminal; the first Type C connector obtains the regulated voltage and transmits the regulated voltage to the session peripheral circuit through the voltage output pin. In the scheme, the protocol chip and the Type C connector can directly transmit voltage to the peripheral circuit, and modules such as a network transformer and a current limiting circuit are not required to be added, so that the resource consumption of products is reduced.

Description

Session peripheral circuit and session system

Technical Field

The invention relates to the technical field of video session, in particular to a session terminal circuit, a session peripheral circuit and a session system.

Background

When the video session is realized, the session terminal besides the data processing function of the video session can also realize the playing of the voice or video of the video session on the peripheral equipment through the peripheral equipment connected with the session terminal.

When the distance between the session terminal and the peripheral equipment is long, the conventional conference terminal product uses POE (Power Over Ethernet) protocol to support power transmission and data output interaction, and uses more than five types of twisted-pair network cables to connect the terminal and the peripheral equipment. In the terminal product, the voltage input by the adapter is required to be increased to about 54V required by POE through a boost chopper circuit of DC-DC, and then a primary current limiting circuit is added at the power output end to limit the overlarge power output and prevent the circuit from being damaged due to abnormal load. In the peripheral products, an RJ45 interface end is required to be added with a network transformer so as to be isolated from the inside of the circuit, and then power and electric power are passed through a rectifier bridge, so that the input power direction is ensured to be consistent. The special protocol chip is added to the rear pole so as to control and confirm the power gear, and the voltage conversion is carried out through a flyback circuit of DC-DC, so that the high voltage 54V is converted into the internal common 12V low voltage.

However, in the above scheme, after the POE circuit is introduced, modules such as a current limiting circuit, a rectifier bridge, a network transformer and the like are required in the product, and more resources are consumed.

Disclosure of Invention

The application provides a session terminal circuit, a session peripheral circuit and a session system, which reduce the resource consumption of products.

In one aspect, a session terminal circuit is provided, which includes a first voltage regulation circuit, a first protocol chip, and a first Type C connector; the first voltage regulating circuit comprises a first voltage regulating chip and a voltage regulating module;

the first protocol chip is electrically connected with a second CC pin of a second protocol chip in the session peripheral circuit through the first CC pin so as to acquire a voltage regulation request of the second protocol chip;

the first protocol chip forwards a voltage regulation request of the second protocol chip to a feedback pin of a first voltage regulation chip through a voltage request pin, so that the first voltage regulation chip controls the voltage regulation module to regulate the voltage, and the voltage regulation module outputs a regulated voltage value through an output voltage end;

and the voltage access pin of the first Type C connector is connected with the output voltage end, and the adjusted voltage value is transmitted to the session peripheral circuit through the voltage output pin.

In a possible implementation manner, the session terminal circuit further comprises a first signal enhancement chip;

the first Type C connector is connected with the first signal enhancement chip through a data transmission pin, so that the first signal enhancement chip enhances a target signal and then transmits an enhanced signal to the session peripheral circuit through a cable.

In one possible implementation, the voltage regulation module includes a first field effect transistor, a second field effect transistor, and a first inductor;

the source electrode of the first field effect tube is connected with the drain electrode of the second field effect tube; the drain electrode of the first field effect transistor is connected with the output voltage end; the first inductor is connected with the source electrode of the first field effect transistor and the drain electrode of the second field effect transistor so as to form the booster circuit;

the first voltage regulating chip is connected with the grid electrode of the first field effect transistor and the grid electrode of the second field effect transistor so as to control the working state of the booster circuit.

In one possible implementation manner, the voltage regulation module further comprises a third field effect transistor and a fourth field effect transistor;

the source electrode of the third field effect transistor is connected with the drain electrode of the fourth field effect transistor; the drain electrode of the third field effect transistor is connected with the input voltage end; the first inductor is connected with the source electrode of the third field effect transistor and the drain electrode of the third field effect transistor, so that a voltage reducing circuit is formed, and the voltage input by the input voltage end is subjected to voltage reducing treatment;

The first voltage regulating chip is connected with the grid electrode of the third field effect transistor and the grid electrode of the fourth field effect transistor so as to control the working state of the voltage reducing circuit.

In one possible implementation manner, the session terminal circuit further comprises a voltage conducting module; the voltage conduction module comprises a fifth field effect transistor; the grid electrode of the fifth field effect transistor is connected with the first protocol chip so that the first protocol chip controls the switch of the fifth field effect transistor;

and the drain electrode of the fifth field effect tube is connected with the output voltage end, and the source electrode of the fifth field effect tube is electrically connected with the first Type C connector.

In one possible implementation, the compensation pin of the first voltage regulation chip is connected with an inner loop compensation circuit; the inner loop compensation circuit comprises a loop resistor, a first loop capacitor and a second loop capacitor; the loop resistor is connected in series with the first loop capacitor and then connected in parallel with the second loop capacitor to be grounded.

In yet another aspect, a session peripheral circuit is provided, where the session peripheral circuit includes a second voltage regulation circuit, a second protocol chip, and a second Type C connector;

The second protocol chip is electrically connected with a first CC pin on a first protocol chip on a session terminal circuit through a second CC pin so as to transmit a voltage regulation request of the second protocol chip to the session terminal circuit;

a voltage input pin on the second Type C connector acquires an adjusted voltage value output by the first Type C connector through a voltage output pin through a cable; the regulated voltage value is obtained by a first protocol chip in the conference terminal circuit transmitting a voltage regulation request of the second protocol chip to a feedback pin of a first voltage regulation chip through a voltage request pin so that the first voltage regulation chip controls a voltage regulation module;

the voltage output pin is electrically connected to a second voltage regulating circuit, so that the regulated voltage value output by the voltage output pin is subjected to voltage regulation again and is output to other circuit modules in the session peripheral circuit.

In one possible implementation manner, the second protocol chip is further configured to access the adjusted voltage value, and generate and send a voltage update request to the session terminal circuit according to a difference between the adjusted voltage value and a preset voltage value, so that the session terminal circuit controls the magnitude of the adjusted voltage value.

In a possible implementation manner, the session peripheral equipment circuit further comprises a second signal enhancement chip;

and a signal receiving pin of the second signal enhancement chip is connected with the cable so as to decode the received enhancement signal, restore the received enhancement signal to a target signal and transmit the target signal to a data processing circuit through the second Type C connector.

In one possible implementation, the second voltage regulating circuit includes a second voltage regulating chip therein;

the feedback pin of the second voltage regulating chip is connected with each resistor-capacitor part, and each resistor-capacitor part comprises at least one capacitor and at least one resistor;

and each resistor-capacitor piece is used for feeding back the voltage value output by the second voltage regulating chip to the feedback pin, so that the second voltage regulating chip corrects the internal voltage regulating parameters so as to control the voltage value output by the second voltage regulating chip.

In yet another aspect, a session system is provided, where the session system includes a session terminal and a session peripheral; a session terminal circuit is deployed in the session terminal; the session peripheral is provided with a session peripheral circuit;

The session terminal circuit comprises a first voltage regulating circuit, a first protocol chip and a first Type C connector; the first voltage regulating circuit comprises a first voltage regulating chip and a voltage regulating module;

the session peripheral circuit comprises a second voltage regulating circuit, a second protocol chip and a second Type C connector;

the first protocol chip and the second protocol chip carry out protocol handshake through respective CC pins so that the second protocol chip sends a voltage regulation request corresponding to the session peripheral to the first protocol chip;

the first voltage regulating circuit is used for controlling the voltage regulating module to regulate the voltage when receiving the voltage regulating request forwarded by the first protocol chip, so that the voltage regulating module outputs the regulated voltage value through the output voltage end;

the voltage access pin of the first Type C connector is connected with the output voltage end, and the adjusted voltage value is transmitted to the second Type C connector, the second voltage adjusting circuit and the second protocol chip through the voltage output pin; and the second voltage regulating circuit regulates the regulated voltage value output by the voltage output pin again and outputs the regulated voltage value to other circuit modules in the conversation peripheral circuit.

In a further aspect, an electronic device is provided, which is loaded with any of the above possible implementations of the session termination circuit, to implement the functionality of the session termination circuit in the computer device.

In yet another aspect, an electronic device is provided that is loaded with any of the above possible implementations of the session peripheral circuitry to implement the functionality of the session peripheral circuitry in the computer device.

In yet another aspect, a computer-readable storage medium having stored therein at least one instruction loaded and executed by an electronic device to implement the functionality of the session termination circuit or session peripheral circuit described above is provided.

The technical scheme that this application provided can include following beneficial effect:

when the terminal needs to be remotely connected with the peripheral equipment so as to realize remote data transmission and power supply to the peripheral equipment, a session terminal circuit can be arranged at the terminal, and a session peripheral circuit is arranged in the peripheral equipment, at the moment, the session terminal circuit and the session peripheral circuit can realize mutual identification through CC pins in respective protocol chips based on a PD protocol, and when the session terminal circuit recognizes a voltage regulation request sent by the session peripheral circuit through the CC pins, the terminal can realize the on-demand regulation of voltage output to the peripheral equipment by utilizing the first voltage regulation chip and the voltage regulation module, so that the stable and efficient output voltage is realized, the condition of insufficient power supply caused by line loss or load loss caused by overlarge voltage transmitted during remote connection is avoided, and the remote stable and efficient power supply to the session peripheral circuit is realized. In the scheme, the protocol chip and the Type C connector can directly transmit voltage to the peripheral circuit, and modules such as a network transformer and a current limiting circuit are not required to be added, so that the resource consumption of products is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a structure of a session system according to an exemplary embodiment.

Fig. 2 is a schematic diagram of a boost chopper circuit, according to an example embodiment.

Fig. 3 is a schematic diagram illustrating a structure of a session termination circuit according to an exemplary embodiment.

Fig. 4 is a schematic diagram of a session termination circuit according to an exemplary embodiment.

Fig. 5 is a schematic diagram of a conversational peripheral circuit, according to one example embodiment.

Fig. 6 is a schematic diagram of a conversational peripheral circuit, according to one example embodiment.

Detailed Description

The following description of the embodiments of the present application will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It should be understood that, in the embodiments of the present application, the "indication" may be a direct indication, an indirect indication, or an indication having an association relationship. For example, a indicates B, which may mean that a indicates B directly, e.g., B may be obtained by a; it may also indicate that a indicates B indirectly, e.g. a indicates C, B may be obtained by C; it may also be indicated that there is an association between a and B.

In the description of the embodiments of the present application, the term "corresponding" may indicate that there is a direct correspondence or an indirect correspondence between the two, or may indicate that there is an association between the two, or may indicate a relationship between the two and the indicated, configured, or the like.

In the embodiment of the present application, the "predefining" may be implemented by pre-storing corresponding codes, tables or other manners that may be used to indicate relevant information in devices (including, for example, terminal devices and network devices), and the specific implementation of the present application is not limited.

Fig. 1 is a schematic diagram of a structure of a session system according to an exemplary embodiment. The session system may be used for remote video sessions. As shown in fig. 1, the session system includes a session terminal 110 and a session peripheral 120.

The session terminal 110 is configured with a session terminal circuit, where the session terminal circuit includes a first voltage adjusting circuit, a first protocol chip, and a first Type C connector.

Optionally, the session terminal circuit further includes a first signal enhancement chip. In one embodiment, the first signal enhancement chip is a USB enhancement chip.

The session peripheral 120 is configured with a session peripheral circuit comprising a second voltage regulation circuit, a second protocol chip, and a second Type C connector.

Optionally, the session peripheral equipment circuit further comprises a second signal enhancement chip. In one embodiment, the second signal enhancement chip is a USB enhancement chip.

The first protocol chip and the second protocol chip interact through respective CC pins so that the second protocol chip sends a voltage regulation request corresponding to the session peripheral to the first protocol chip;

the voltage access pin of the first Type C connector is connected with the output voltage end, and the regulated voltage value is transmitted to the second Type C connector, the second voltage regulating circuit and the second protocol chip through the voltage output pin; and the second voltage regulating circuit regulates the regulated voltage value output by the voltage output pin again and outputs the regulated voltage value to other circuit modules in the conversation peripheral circuit.

For example, other circuit modules in the session peripheral circuit may include a data processing module formed by an MCU ((Microcontroller Unit, micro processing unit)) that can operate normally when receiving a voltage required for actual operation and decode a signal transmitted from the session terminal circuit via a cable after receiving the signal, thereby converting data in a video format or an audio format for display or playback by the session peripheral.

In the session system formed by the session terminal 110 and the session peripheral 120, the first protocol chip in the session terminal circuit and the second protocol chip in the session peripheral circuit perform CC protocol interaction through the CC pin, so that the second protocol chip transmits the voltage information required by the peripheral to the first protocol chip through the CC protocol data, and after the first protocol chip analyzes the CC protocol data, the first protocol chip sends a voltage adjustment request containing the voltage information to the first voltage adjustment chip in the session terminal circuit. After the first voltage regulating chip receives the voltage regulating request, the voltage is controlled to be increased or decreased according to the voltage of the current access and the voltage of the voltage regulating request, and the increased or decreased voltage is input to the first typeC connector. At the moment, the first TypeC connector is connected with the second TypeC connector through a cable so as to transmit the boosted or stepped-down voltage to the session peripheral equipment, and therefore power supply of the session peripheral equipment is achieved.

And the conversation peripheral circuit can monitor whether the received voltage meets the requirement of the conversation peripheral, and when the received voltage does not meet the requirement, the conversation peripheral circuit continuously sends a voltage regulation request to the conversation terminal circuit through the CC protocol so as to request the first voltage regulation circuit in the conversation terminal circuit to further regulate the voltage output to the peripheral until the voltage received by the conversation peripheral meets the requirement.

In one embodiment, the first voltage regulating circuit is a DC-DC circuit, which is a voltage converter that effectively outputs a fixed voltage after converting an input voltage. In one possible implementation of the embodiments of the present application, the DC-DC circuit is implemented by a BOOST chopper circuit (i.e., BOOST circuit). The boost chopper circuit chops constant direct current voltage or current into a series of pulse voltage or current through fast on-off control of a power electronic switching device, and under the condition of certain filtering, the voltage or current with average value smaller or larger than that of a power supply can be obtained on a load.

Referring to fig. 2, a schematic diagram of a boost chopper circuit according to an embodiment of the present application is shown. As shown in fig. 2, when the inductance L and the capacitance C are large, and a and V are on, E charges L, the charging current is constantly Ii, and C supplies power to the load R, and since C is large, the output voltage is constantly Uo, and the time Ton of V is set, and the energy bit accumulated in L is e·ii·ton.

b. When V is broken, E and L charge C together and supply power to load R, and when V is broken for Toff, the energy released by inductance L at this stage is (Uo-E) Ii.toff.

c. If steady state is reached, the energy accumulated in L and the energy released should be equal in one period T, the voltage can be expressed as follows:

E·Ii·Ton＝(Uo-E)Ii·Toff

Uo-E＝E·Ton/Toff

Uo＝E(1+Ton/Toff)

Uo＝E(Ton+Toff)/Toff＝E(T/Toff)

since (T/Toff) is 1 or more, the output voltage of this circuit is higher than the power supply voltage, so that the circuit is called a Boost chopper (Boost) circuit. (T/Toff) is called the step-up ratio, and the Uo size can be changed by adjusting the size.

Thus, by a structure similar to that shown in fig. 2, it is possible to realize in the session terminal 110 that the low voltage in the terminal is raised to a specified high voltage by the DC-DC circuit so as to supply power to the peripheral.

Similarly, a DC-DC circuit is also present in the session peripheral 120, but since the voltage accessed by the session peripheral is a high voltage transmitted after the session terminal is boosted, in order to ensure that each circuit in the session peripheral including the MCU (micro processing unit) can be kept under normal operating conditions, the DC-DC circuit in the session peripheral may be a buck chopper circuit, so as to implement conversion of the accessed high voltage into a normal voltage (e.g. 5V) suitable for operation of each circuit unit. The BUCK chopper circuit can be similar to the boost chopper circuit, can be of other structures, and can realize BUCK circuits with BUCK functions, and the BUCK chopper circuit is not limited in the application.

In other possible implementations, the DC-DC circuit of the session termination circuit may also be a buck chopper circuit.

In other possible implementations, the DC-DC circuit of the session termination circuit is a combination of a boost circuit and a buck circuit, and the boost circuit or the buck circuit is selectively turned on according to a voltage regulation request. Further, the session terminal circuit interactively determines a voltage regulation request of the session peripheral circuit through the first protocol chip and the second protocol chip of the session peripheral circuit, wherein the voltage regulation request carries the voltage required by the session peripheral; the session terminal circuit is connected with an external power supply and converts the voltage of the external power supply into the voltage required by the session peripheral equipment and transmits the voltage to the session peripheral equipment circuit, so that the session terminal circuit controls the DC-DC circuit to boost or buck according to the comparison result of the connected external voltage and the voltage required by the session peripheral equipment; and if the external voltage is lower than the voltage required by the session peripheral equipment, controlling the DC-DC circuit to boost so that the voltage output by the session terminal circuit is the voltage required by the session peripheral equipment.

In one possible implementation, the first protocol chip in the session termination circuit is a protocol chip for the PD protocol, alternatively the protocol chip may be a PD protocol chip for supporting high voltages (e.g. 54V). USB-PD is a fast charging specification established by the USB-IF organization, and is one of the current mainstream fast charging protocols. The USB-PD fast charging protocol can increase the power transmission through the USB cable and the connector, and expand the cable bus power supply capacity in USB application, thereby achieving the purpose of improving charging voltage or current, and freely changing the power transmission direction.

Similarly, in one possible implementation, the second protocol chip in the session peripheral circuit may be a PD protocol chip of a specification corresponding to the session terminal. The second protocol chip in the session peripheral circuit can realize interaction of PD protocol and transmission of voltage through the CC pin by the first protocol chip of the session terminal circuit. For example, when the session termination circuit and the session peripheral circuit are electrically connected, the second protocol chip in the session peripheral circuit and the first protocol chip in the session termination circuit may determine the state according to the level on the CC pin. For example, the CC1 pin and the CC2 pin on the first protocol chip in the session terminal are pulled up to a high level to send a notification to the session peripheral that the session terminal is the source terminal. At this time, the Rd resistor of the second protocol chip in the session peripheral circuit is pulled down to inform the session terminal that the session peripheral is a sink terminal at this time, and the Rd resistor on the CC pin of the second protocol chip in the session peripheral circuit at this time can indicate the voltage gear and the power output requested by the session peripheral at this time. For another example, when the session terminal circuit and the session peripheral circuit are electrically connected, the second protocol chip in the session peripheral circuit and the first protocol chip in the session terminal circuit can also transmit corresponding protocol data through the CC pins by means of the CC protocol, and according to the mutually transmitted protocol data, the source end and sink end are identified, and the source end can analyze the CC protocol data transmitted by the sink end, so as to identify the voltage gear and the power output size requested by the session peripheral.

Further, the session terminal circuit comprises a first Type C connector, the session peripheral circuit comprises a second Type C connector, the first Type C connector and the second Type C connector are connected through a cable, CC pins are respectively arranged on the first Type C connector and the second Type C connector, the first Type C connector is connected with the CC pins of the first protocol chip, and the second Type C connector is connected with the CC pins of the second protocol chip, so that electric connection between the first protocol chip in the session terminal and the CC pins of the second protocol chip in the session peripheral is realized.

In one embodiment, the session terminal circuit further includes a first signal enhancement chip, where the first signal enhancement chip may access a signal (which may include a session signal in the embodiment of the present application) that needs to be transmitted to a session peripheral device, and perform coding processing on the signal, and transform the signal into a specified format for transmission, so as to improve the anti-interference capability of the signal. For example, the first signal enhancement chip is a USB enhancement chip, the USB enhancement chip may be NS1021S, and the NS1021S may directly enhance the signal itself from the physical layer, without parsing the USB2.0 protocol, and improve the reliability of transmission through AC coupling and encoding and decoding.

Specifically, when the DM/DP signal of the USB of the session terminal is transmitted to the first USB enhanced chip in the session terminal circuit, the first USB enhanced chip may convert the DM/DP signal into the CON/COP signal and transmit the CON/COP signal to the session peripheral through the cable. At this time, after receiving the CON/COP signal, the second USB enhancement chip in the session peripheral circuit decodes the CON/COP signal, converts the CON/COP signal into a DM/DP signal in a USB format, and sends the DM/DP signal to the MCU of the session peripheral to realize data interaction.

Fig. 3 is a schematic diagram illustrating a structure of a session termination circuit according to an exemplary embodiment. The session terminal circuit is used for realizing power supply and data transmission through the PD protocol and the session peripheral circuit; the session termination circuit includes a first voltage regulation circuit, a first protocol chip 320, and a first Type C connector 330; the first voltage regulation circuit includes a first voltage regulation chip 310 and a voltage regulation module.

The first protocol chip 320 is electrically connected with a second CC pin of a second protocol chip in the session peripheral circuit through the first CC pin, so as to obtain a voltage regulation request of the second protocol chip;

the first protocol chip 320 forwards the voltage regulation request of the second protocol chip to the feedback pin of the first voltage regulation chip 310 through the voltage request pin, so that the first voltage regulation chip controls the voltage regulation module to regulate the voltage, and the voltage regulation module outputs the regulated voltage value through the output voltage terminal;

The voltage access pin of the first Type C connector 330 is connected to the output voltage terminal, and the adjusted voltage value is transmitted to the session peripheral circuit through the voltage output pin.

In one possible implementation manner of the embodiment of the present application, a first CC pin on the first protocol chip is connected to a CC pin on the first Type C connector; because the first Type C connector and the second Type C connector are all USB Type C connectors, and CC pins exist in the USB Type C to realize the transmission of PD protocol, the first CC pins on the first protocol chip and the second CC pins on the second protocol chip realize the transmission of PD protocol and mutual interaction process through the first Type C connector and the second Type C connector.

In another possible implementation manner of the embodiment of the present application, in an interaction process between the first protocol chip and the second protocol chip, the first protocol chip interacts with the sink end (i.e., the second protocol chip) through the CC, and determines the resistance value of Rd according to a signal transmitted by the sink end, so as to determine a voltage gear requested by the sink end.

When the first protocol chip receives a voltage regulation request, the first protocol chip can input a feedback signal to a feedback pin of the first voltage regulation chip through a voltage request pin, and when the first voltage regulation chip detects that the feedback signal indicates that the voltage needs to be raised, a booster circuit in the voltage regulation module is controlled to convert the originally output lower direct current voltage into higher direct current voltage; when the first voltage regulating chip detects that the feedback signal indicates that the voltage needs to be reduced, a voltage reducing circuit in the voltage regulating module is controlled to convert the originally output higher direct current voltage into lower direct current voltage; further, after the voltage regulating module outputs the output voltage value after being regulated up or regulated down through the output voltage end, since the power supply pin (i.e. the voltage access pin) of the first Type C connector is connected with the output voltage end, the voltage accessed by the first Type C connector is the voltage after being regulated up or regulated down at this time, and the first Type C connector can transmit the voltage after being regulated up or regulated down to the second Type C connector through the VBUS pin, so as to realize power supply to the conversation peripheral circuit.

And when the regulated voltage does not accord with the requested voltage gear, the second protocol chip can adjust the voltage regulation request sent to the first protocol chip so as to control the voltage regulation capability in the first voltage regulation circuit.

In a specific embodiment, taking the case of converting the input voltage into a higher direct-current voltage, when the second protocol chip receives the converted direct-current high voltage, the direct-current high voltage is compared with the voltage gear requested by the second protocol chip, and when the direct-current high voltage does not coincide with the voltage gear requested by the second protocol chip (for example, when the direct-current high voltage is lower than the voltage gear requested by the second protocol chip), the second protocol chip can adjust the voltage regulation request sent to the first protocol chip to control the voltage regulation capability in the first voltage regulation circuit, so that the direct-current high voltage output by the first voltage regulation circuit is continuously raised until the voltage value received by the second protocol chip is matched with the voltage gear requested by the second protocol chip.

In summary, when the terminal needs to be remotely connected with the peripheral, so as to realize remote data transmission and power supply to the peripheral, the session terminal circuit can be arranged at the terminal, and the session peripheral circuit is arranged in the peripheral, at this time, the session terminal circuit and the session peripheral circuit can realize mutual identification through the CC pins in the respective protocol chips based on the PD protocol, and the session terminal circuit can realize remote stable and efficient power supply to the session peripheral circuit according to the interaction between the first protocol chip and the second protocol chip when recognizing the voltage regulation request sent by the session peripheral circuit through the CC pins, so that the voltage output to the peripheral by the terminal is regulated as required by utilizing the first voltage regulation chip and the voltage regulation module, thereby realizing stable and efficient output voltage, avoiding the occurrence of insufficient power supply caused by circuit loss or load loss caused by overlarge voltage during remote connection. In the scheme, the protocol chip and the Type C connector can directly transmit voltage to the peripheral circuit, and modules such as a network transformer and a current limiting circuit are not required to be added, so that the resource consumption of products is reduced.

Fig. 4 is a schematic diagram of a session termination circuit according to an exemplary embodiment. As shown in fig. 4, the session termination circuit includes a first voltage regulation chip 410, a first protocol chip 420, and a first Type C connector 430.

The first protocol chip 420 is electrically connected to a second CC pin of a second protocol chip in the session peripheral circuit through a first CC pin (at least one of CC1 and CC2, where either of CC1 and CC2 is used for receiving a CC protocol when the other is used for sending the CC protocol), so as to obtain a voltage regulation request of the second protocol chip;

after the first protocol chip 420 receives the voltage adjustment request sent by the second protocol chip in the session peripheral equipment circuit through the first CC pin, the voltage adjustment request is decoded, and is transmitted to the FB pin of the first voltage adjustment chip 410 through the voltage request pin IFO. After receiving the voltage adjustment request through the FB pin, the first voltage adjustment chip 410 controls the voltage adjustment module IN the session termination circuit according to the indication of the voltage adjustment request, converts the voltage value input by vcc_in, and realizes the output of the converted voltage through vcc_out.

The voltage access pin of the first Type C connector 430 is electrically connected to the output voltage terminal vcc_out, and the regulated voltage is transmitted to the session peripheral circuit through the voltage output pin.

In one possible implementation of the embodiment of the present application, the voltage adjustment module includes a first fet 411, a second fet 412, and a first inductor 413; the source of the first field effect transistor 411 is connected with the drain of the second field effect transistor 412; the drain electrode of the first field effect transistor is connected with the output voltage end; the first inductor is connected with the source electrode of the first field effect transistor and the drain electrode of the second field effect transistor so as to form a booster circuit; the first voltage regulating chip is connected with the grid electrode of the first field effect transistor and the grid electrode of the second field effect transistor so as to control the working state of the booster circuit.

In an embodiment of the present application, the boost circuit may include a first field effect transistor, a second field effect transistor, and a first inductor; the first field effect transistor, the second field effect transistor and the first inductor form a boost chopper circuit. Referring to the boost chopper circuit principle shown in fig. 2, the first voltage regulating chip 410 is connected to the gates of the first fet and the second fet through the LG2 and UG2 pins, so as to control the boost ratio in the boost circuit by controlling the switching time of the first fet and the second fet, so as to control the regulated voltage value output by the boost circuit.

For example, the first regulation chip 410 sends pulse voltages with a specified period and a specified pulse width to the gates of the first field-effect transistor and the second field-effect transistor through the LG2 and UG2 pins, respectively, so as to control the first field-effect transistor and the second field-effect transistor to be in an on state when the pulse voltages are at a high level and to be in an off state when the pulse voltages are at a low level, respectively.

Optionally, pulse voltages sent by the LG2 pin and the UG2 pin respectively indicate that the first fet and the second fet are turned on in different time periods. When the first field effect transistor is disconnected and the second field effect transistor is conducted, VCC_IN passes through the third field effect transistor which is conducted, passes through the inductor, and is transmitted to the ground wire through the second field effect transistor, and IN the process, the inductor is charged. When the first field effect transistor is turned on and the second field effect transistor is turned off, VCC_IN is transmitted to VCC_OUT through the first field effect transistor through the inductor by the turned-on third field effect transistor. IN the process, the inductor is IN a discharging state, and the induced voltage is also transmitted to the VCC_OUT, so that the equivalent voltage value of the VCC_OUT IN one pulse period is larger than the VCC_IN, and the chopping boosting process is realized.

In the process, the first voltage regulating chip can control the ratio of the on time and the off time of the first field effect transistor and the second field effect transistor by respectively controlling the pulse period and the pulse width of the first field effect transistor and the second field effect transistor, so that the ratio of the inductor charging process to the inductor discharging process is controlled, and the step-up ratio of the step-up chopper circuit formed by the first field effect transistor, the second field effect transistor and the first inductor is further controlled.

The first protocol chip transmits a voltage regulation request of the second protocol chip to a feedback pin (FB pin) of the first voltage regulation chip through a voltage request pin (IFO pin), and the first voltage regulation chip selects a pulse period and a pulse width of a voltage input to a grid electrode of the first field effect transistor and a pulse period and a pulse width of a voltage input to a grid electrode of the second field effect transistor according to the voltage regulation request, so that a voltage value output by the booster circuit is controlled.

In one possible implementation of the embodiment of the present application, the voltage adjustment module includes a third fet 414, a fourth fet 415, and a first inductor 413;

the source electrode of the third field effect tube is connected with the drain electrode of the fourth field effect tube; the drain electrode of the third field effect transistor is connected with the input voltage end; the first inductor is connected with the source electrode of the third field effect transistor and the drain electrode of the third field effect transistor so as to form a voltage reducing circuit, so that the voltage input by the input voltage end is subjected to voltage reducing treatment;

The first voltage regulating chip is connected with the grid electrode of the third field effect transistor and the grid electrode of the fourth field effect transistor through LG1 and UG1 pins so as to control the working state of the voltage reducing circuit.

Namely, the step-down circuit is a step-down chopper circuit which can be composed of a third field effect transistor, a fourth field effect transistor and a first inductor. When the voltage regulating circuit works, the first voltage regulating chip sends pulse electric waves to the third field effect tube and the fourth field effect tube, the third field effect tube and the fourth field effect tube are instructed to switch according to a specified period, and at the moment, equivalent voltage with lower voltage value is induced in the inductor and is transmitted to the output voltage end.

In one possible implementation manner of the embodiment of the present application, the session termination circuit as shown in fig. 4 further includes a voltage regulation module configured by a first fet 411, a second fet 412, a third fet 414, a fourth fet 415, and a first inductor 413.

The first voltage regulating chip 410 is connected to the gate of the first fet 411 through UG2, to the gate of the second fet 412 through LG2, to the gate of the third fet through UG1, and to the gate of the fourth fet through LG 1.

The source of the third FET 414 is connected to VCC_IN and the drain of the first FET 411 is connected to VCC_OUT.

Specifically, when it is determined that the boosting operation is required, the voltage regulating chip instructs the third fet 414 to be turned on, introduces the input voltage value vcc_in, and the fourth fet to be turned off 415, so as to avoid the influence on the boosting circuit; the first field effect transistor 411 and the second field effect transistor 412 are turned on periodically according to a pulse wave, thereby forming a boost chopper circuit, and transmitting a voltage raised by an inductor to vcc_out.

When the voltage-reducing operation is required, the voltage-regulating chip instructs the second field-effect transistor 412 to be turned off, so as to avoid the influence on the voltage-reducing circuit, and at this time, the third field-effect transistor 414 and the fourth field-effect transistor 415 are turned on according to the pulse wave sent by the voltage-regulating chip and IN a specified period, so as to form a voltage-reducing chopper circuit, and a corresponding reduced equivalent voltage is generated IN the inductor, and after vcc_in is reduced by the voltage-reducing chopper circuit, at this time, the first field-effect transistor 411 is turned on, so that the reduced equivalent voltage is led OUT to vcc_out.

Optionally, the session terminal circuit further includes a voltage conduction module; the voltage turn-on module includes a fifth field effect transistor 416; the voltage feedback pin FB of the first voltage regulating chip 410 is connected to the IFO voltage request pin of the first protocol chip 420. The first protocol chip 420 is connected to the gate of the fifth fet 416 through a CDNC switch pin; the source of the fifth fet is connected to vcc_out, the fifth fet outputs a voltage vbus_out through the drain, and the drain of the fifth fet 416 is electrically connected to the first Type C connector 430 to transmit vbus_out to the session peripheral through the first Type C connector 430. Optionally, the first protocol chip 420 is further connected to vcc_out through a voltage detection pin to detect the voltage value of vcc_out.

Specifically, the first protocol chip 420 controls the switch of the fifth field effect transistor 416 through the CDNC switch pin according to the interaction condition of the first CC pin and the second CC pin, for example, when the first CC pin does not detect the protocol signal sent by the second CC pin, it indicates that the session peripheral is disconnected from the session terminal, and at this time, the first CC pin may disconnect the fifth field effect transistor between vcc_out and vbus_out, so as to stop the power supply of the first Type C connector, thereby improving the security of the session terminal. When the first protocol chip 420 detects that the vcc_out voltage outputted from the voltage output terminal is abnormal (for example, the voltage is too high) through the voltage detection pin, the fifth fet 416 can be controlled to be turned off, so as to protect the conference peripheral from being damaged by the abnormal voltage.

Specifically, there are a plurality of VBUS pins in the first Type C connector 430 to receive the voltage value of vbus_out through one or a few of the pins, and output the received voltage to the cable through the other VBUS pins.

Further, the d1+ pin of the first Type C connector 430 is connected to a data generating module (not shown in the figure) in the D1-pin and session termination circuit, and receives the DP/DM signal generated in the data generating module and required to be transmitted to the session peripheral circuit. Optionally, the first Type C connector 430 is connected to the first signal enhancement chip through data transmission pins (d2+ and D2 "), so that the first signal enhancement chip enhances the received DP/DM signal, and transmits the enhanced signal to the session termination circuit through a cable through the CON/COP pin.

Optionally, the first signal enhancement chip may be an NS1021S chip, and the session terminal circuit may encode the signal in the DP/DM format into the private information format CON/COP for transmission through the NS 1021S; when the session peripheral circuit obtains the signal encoded by the first signal enhancement chip, the second signal enhancement chip (NS 1021S chip) in the session peripheral circuit is used for decoding the encoded signal, so that the signal is restored to the signal in the DM/DP format and transmitted to the second Type C connector, the second Type C connector re-decodes the signal in the DM/DP format, and the finally obtained target signal is transmitted to the data processing circuit, so that a complete data transmission flow is realized.

In the embodiment of the application, the session terminal circuit can also transmit data to the session peripheral circuit through the USB in addition to providing the regulated voltage for the session peripheral circuit. When other modules in the session terminal send data to the first Type C connector through D1+ and D1-pins of the first Type C connector, the first Type C connector encodes the data into signals in USB format through USB protocol, and outputs the signals through two data lines D2+ and D2 (namely, data transmission is performed through DM/DP format). But in a long-range data transmission scenario, the data transmission is more affected and signal attenuation is likely to occur. In order to avoid the occurrence of signal attenuation as much as possible, the first Type C connector may input DM/DP into the first signal enhancement chip, so that the first signal enhancement chip encodes the signal in the USB format, for example, encodes the signal into the private information format CON/COP through NS1021S for transmission, thereby improving the anti-interference capability of the signal.

Optionally, the compensation pin of the first voltage regulating chip is connected with an inner loop compensation circuit; the inner loop compensation circuit comprises a loop resistor, a first loop capacitor and a second loop capacitor; the loop resistor is connected in series with the first loop capacitor and then connected in parallel with the second loop capacitor to be grounded.

The inner loop compensation circuit can enable the first voltage regulating chip to work in constant current and voltage stabilizing states, and the first voltage regulating chip can provide voltage conversion and can realize protection mechanisms such as overvoltage, overcurrent, undervoltage and the like through the cooperation of other peripheral resistor-capacitor parts (not shown in the figure).

It should be noted that in the session termination circuit shown in fig. 4, in addition to the elements shown in fig. 4, other elements (such as a capacitance resistor device) for maintaining the normal or stable operation of the circuit exist around each chip, or other pins are connected to corresponding voltages, so as to ensure the stable operation of each chip. The capacitance resistance devices around each element or the circuit structures connected with other pins can be set autonomously by a person skilled in the art according to the operation environment of the session terminal circuit, so as to ensure the normal operation of the session terminal circuit in each environment, which is not limited in the embodiment of the present application.

Fig. 5 is a schematic diagram of a conversational peripheral circuit, according to one example embodiment. As shown in fig. 5, the session peripheral circuit includes a second voltage regulation circuit, a second protocol chip 520, and a second Type C connector 530; the second voltage regulating circuit further includes a second voltage regulating chip 510.

The second protocol chip 520 is electrically connected with the first CC pin on the first protocol chip on the session terminal circuit through the second CC pin, so as to transmit the voltage regulation request of the second protocol chip 520 to the session terminal circuit;

the voltage input pin on the second Type C connector 530 obtains the adjusted voltage value output by the first Type C connector through the voltage output pin through the cable; the regulated voltage value is obtained by the first protocol chip in the conference terminal circuit transmitting a voltage regulation request of the second protocol chip to a feedback pin of the first voltage regulation chip through a voltage request pin so that the first voltage regulation chip controls a voltage regulation module;

the voltage output pin is electrically connected to the second voltage regulating circuit so as to regulate the voltage of the regulated voltage value output by the voltage output pin again and output the regulated voltage value to other circuit modules in the peripheral circuit.

Further, a second CC pin on the second protocol chip is connected with a CC pin on the second Type C connector; because the first Type C connector and the second Type C connector are USB Type chips, and CC pins exist in the USB Type chips to realize the transmission of PD protocols, the first CC pins on the first protocol chips and the second CC pins on the second protocol chips are electrically connected through the first Type C connector and the CC pins on the second Type C connector, and therefore interaction of PD protocols is realized.

In the session peripheral circuit, the CC pin on the second Type C connector 530 receives the adjusted voltage value transmitted by the CC pin of the first Type C connector through the cable, after the interaction of the Source end protocol chip (i.e., the first protocol chip), the session terminal transmits the adjusted voltage to the session peripheral, at this time, the voltage output by the second Type C connector 530 is the adjusted voltage value, which is the voltage value set for transmitting the voltage from the session terminal to the session peripheral, and is not necessarily applicable to many elements in the session peripheral, so the voltage output by the second Type C connector 530 (i.e., the voltage of the output voltage end) needs to be connected to the second voltage adjusting chip 510, and is adjusted again by the second voltage adjusting chip 510, so as to realize power supply to each element in the session peripheral.

Fig. 6 is a schematic diagram of a conversational peripheral circuit, according to one example embodiment. As shown in fig. 6, the session peripheral circuit includes a second voltage regulation circuit, a second protocol chip 620, and a second Type C connector 630; the second voltage adjusting circuit includes a second voltage adjusting chip 610 and a capacitance-resistance device connected with the second voltage adjusting chip for ensuring the second voltage adjusting chip 610 to work normally.

The second Type C connector 630 accesses the voltage VBUS transmitted to the session peripheral circuit through the cable. The second Type C connector 630 includes CC pins (i.e., CC1 and CC 2). On the one hand, the CC pins of the second Type C connector 630 are in communication connection with the CC pins of the first Type C connector through a cable; on the other hand, the CC pins of the second Type C connector 630 are respectively connected with the CC pins on the second protocol chip 620 (i.e., CC1 and CC2 on the second protocol chip).

The second signal enhancement chip 640 in the session peripheral equipment circuit is in communication connection with the COP/CON pin on the first signal enhancement chip through a cable by the COP/CON pin, so as to receive the data in the COP/CON format after the encoding of the first signal enhancement chip. After the second signal enhancement chip 640 receives the COP/CON format signal transmitted in the cable through the COP/CON pin, it decodes the COP/CON format signal, and transmits the decoded DP/DM format data to d2+ and D2-pins of the second Type C connector 630.

After receiving the data in the DP/DM format, the d2+ and D2-pins of the second Type C connector 630 transmit the data in the DP/DM format to the data processing module in the session peripheral circuit through the d1+ and D1-pins.

Optionally, the second voltage adjusting chip 610 in the session peripheral circuit is connected to the voltage value VBUS transmitted to the session peripheral circuit through the cable through the VIN pin, and performs voltage adjustment on the VBUS, and outputs the adjusted voltage value through the BST pin. The FB pin in the second voltage regulating chip 610 may further sample a voltage value sent by the BST pin through a capacitance-resistance device, and adjust a voltage transforming capability of a voltage transforming module (e.g., a boost chopper circuit or a buck chopper circuit) integrated in the second voltage regulating chip according to a sampling result, so as to control a voltage output value of the second voltage regulating chip.

When the second protocol chip realizes interaction of the PD protocol through the CC pin and the first protocol chip, the second CC pin of the second protocol chip and the CC pin of the first protocol chip determine that the second protocol chip is used as a sink end at the moment through interaction of CC protocol signals, the first protocol chip is a source end, and the first protocol chip determines a voltage gear requested by the second protocol chip through a voltage regulation request analyzed in the CC protocol signals.

In one possible implementation manner, the second protocol chip is further configured to access the adjusted voltage value, and generate and send a voltage update request to the session termination circuit according to a difference between the adjusted voltage value and a preset voltage value, so that the session termination circuit controls the magnitude of the adjusted voltage value.

Specifically, after the first protocol chip and the second protocol chip interact with each other, the session terminal circuit obtains a voltage value required by the session peripheral circuit and adjusts the access voltage to output an adjusted voltage value meeting the voltage value required by the session peripheral circuit, but when the session terminal and the session peripheral circuit perform long-distance transmission, the voltage drop caused by the longer cable causes the adjusted voltage value actually transmitted from the session terminal circuit to the session peripheral circuit, so that the requirement of normal operation of the peripheral circuit is not met; or when the load of the conversation peripheral circuit changes, the voltage drop on the cable fluctuates due to different currents on the cable, and the voltage value actually received by the conversation peripheral also fluctuates, or the voltage value actually required by the conversation peripheral is changed due to the load change, so that the regulated voltage value output by the conversation terminal circuit does not meet the requirement of normal operation of the peripheral circuit.

In order to solve the above problem, when the first Type C connector transmits the voltage value regulated by the session terminal circuit to the session peripheral device so as to supply power to the session peripheral device, the second protocol chip in the session peripheral device may also receive the regulated voltage value, compare with the preset voltage value in the second protocol chip according to the received regulated voltage value, determine whether the regulated voltage value meets the requirement of the session peripheral device, and when the requirement is not met, the second protocol chip may automatically identify voltage fluctuation through the above comparison process, and then inform the terminal to adjust the regulation function of the voltage so as to update the regulated voltage value. The preset voltage value refers to a voltage value determined by the second protocol chip automatically identifying the load change.

Optionally, the feedback pin of the second voltage regulating circuit is connected to each resistor-capacitor element, and each resistor-capacitor element comprises at least one capacitor and at least one resistor; the resistor-capacitor components are used for feeding back the voltage value output by the BST pin in the second voltage regulating circuit to the feedback pin so as to control the voltage regulating condition of the second voltage regulating circuit.

For example, the second voltage adjusting circuit may be a simplified control chip with a built-in MOS, the FB pin of the output voltage of the second voltage adjusting circuit is configured by a capacitor and a resistor, and the second voltage adjusting circuit may include at least one of a step-up circuit and a step-down circuit based on the MOS.

It should be noted that in the session peripheral circuit shown in fig. 6, in addition to the elements shown in fig. 6, other elements (such as a capacitance resistor device) for maintaining the normal or stable operation of the circuit exist around each chip, or other pins are connected to corresponding voltages, so as to ensure the stable operation of each chip. The capacitive resistive devices around each element or the circuit structures connected with other pins can be set independently by a person skilled in the art according to the operation environment of the session peripheral circuit, so as to ensure the normal operation of the session peripheral circuit in each environment, which is not limited in the embodiment of the present application.

In one embodiment, each component and chip in the session terminal circuit and the session peripheral circuit are all domestic products, for example, the first voltage regulating chip, the first protocol chip and the second protocol chip are all domestic semiconductor chips, and the first signal enhancement chip and the second signal enhancement chip are domestic USB signal enhancers. The conversation terminal circuit and the conversation peripheral circuit are realized by using domestic products, so that the production difficulty and the production cost are effectively reduced.

In an exemplary embodiment, a computer readable storage medium is also provided for storing at least one computer program that is loaded and executed by a processor to implement all or part of the steps of the above method. For example, the computer readable storage medium may be Read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), compact disc Read-Only Memory (CD-ROM), magnetic tape, floppy disk, optical data storage device, and the like.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. The session peripheral circuit is characterized by comprising a second voltage regulating circuit, a second protocol chip and a second Type C connector;

a voltage input pin on the second Type C connector acquires an adjusted voltage value output by the first Type C connector through a voltage output pin through a cable; the regulated voltage value is obtained by a first protocol chip in the session terminal circuit transmitting a voltage regulation request of the second protocol chip to a feedback pin of a first voltage regulation chip through a voltage request pin, so that the first voltage regulation chip controls a voltage regulation module;

the second protocol chip automatically identifies a voltage value determined by load change, and automatically identifies voltage fluctuation according to the adjusted voltage value transmitted by the accessed cable and the voltage value determined by the load change; generating and sending a voltage update request to the session terminal circuit based on the voltage fluctuation, so that the session terminal circuit updates the adjusted voltage value to obtain the updated voltage value;

The voltage output pin is electrically connected to a second voltage regulating circuit, so that the updated voltage value output by the voltage output pin is subjected to voltage regulation again and is output to other circuit modules in the session peripheral circuit.

2. The conversational peripheral circuit of claim 1, further comprising a second signal enhancement chip;

3. The conversational peripheral circuit of any one of claims 1 to 2, wherein the second voltage regulation circuit includes a second voltage regulation chip;

4. A session system, characterized in that the session system comprises a session terminal and a session peripheral; a session terminal circuit is deployed in the session terminal; the session peripheral is provided with a session peripheral circuit;

the session terminal circuit comprises a first voltage regulating circuit, a first protocol chip and a first Type C connector; the first voltage regulating circuit comprises a first voltage regulating chip and a voltage regulating module; the session peripheral circuit comprises a second voltage regulating circuit, a second protocol chip and a second Type C connector;

the voltage access pin of the first Type C connector is connected with the output voltage end, and the adjusted voltage value is transmitted to the second Type C connector, the second voltage adjusting circuit and the second protocol chip through the voltage output pin;

and the second voltage regulating circuit carries out voltage regulation on the updated voltage value again and outputs the voltage value to other circuit modules in the conversation peripheral circuit.