WO2022206691A1

WO2022206691A1 - Signal transmission apparatus

Info

Publication number: WO2022206691A1
Application number: PCT/CN2022/083431
Authority: WO
Inventors: 王甲亮; 赵鹏飞
Original assignee: 安克创新科技股份有限公司
Priority date: 2021-03-30
Filing date: 2022-03-28
Publication date: 2022-10-06

Abstract

The present application relates to the technical field of electronic devices, and discloses a signal transmission apparatus. A signal input interface of the signal transmission apparatus supports a POE protocol, a first protocol circuit supports the POE protocol, and a second protocol circuit supports a USB-PD protocol. The first protocol circuit is electrically connected to the second protocol circuit and is used for converting an electric energy signal inputted from the signal input interface into an electric energy signal conforming to a USB-PD protocol. By means of the mode above, the present application can improve the safety of a charging process of a load device, wiring is simple, and costs are low.

Description

a signal transmission device

This application claims the priority of the Chinese patent applications with application numbers 202110343188.X and 202120648619.9 filed on March 30, 2021, and the invention title is "a signal transmission device", which are incorporated into this application by reference.

【Technical field】

The present application relates to the technical field of electronic equipment, and in particular, to a signal transmission device.

【Background technique】

At present, power adapters that support USB-PD (USB Power Delivery, power transfer protocol) usually use AC input as the main input, and their output power can reach up to 60W to 100W. They are used for consumer electronics with fast charging interfaces such as mobile phones and computers. Product charging. However, the input voltage of such adapters is high, which is prone to potential safety hazards (especially for application scenarios with high safety requirements).

[Content of the invention]

In view of this, the technical problem mainly solved by the present application is to provide a signal transmission device, which can improve the safety of the charging process of the load equipment, and has simple wiring and low cost.

In order to solve the above technical problem, a technical solution adopted in the present application is to provide a signal transmission device. The signal transmission device includes a signal input interface, the signal input interface is used for connecting a signal source device, and the signal input interface supports the POE protocol. The signal transmission device further includes a first protocol circuit, the first protocol circuit supports the POE protocol, and the first protocol circuit is electrically connected to the signal input interface. The signal transmission device further includes a second protocol circuit, the second protocol circuit supports the USB-PD protocol, the second protocol circuit is electrically connected to the signal input interface and the first protocol circuit respectively, and is used for converting the power signal input from the signal input interface into Power signal conforming to USB-PD protocol. The signal transmission device further includes a signal output interface, which is electrically connected to the signal input interface and the second protocol circuit respectively, and is used for outputting a power signal conforming to the USB-PD protocol to the load device.

In an embodiment of the present application, according to the power of the power signal that the signal source device can provide, there are several input power levels. The first protocol circuit can identify the target input power level, and the target input power level is the current connection of the signal input interface. the input power level of the signal source device; the signal transmission device further includes a protocol interaction circuit, which is electrically connected between the first protocol circuit and the second protocol circuit to carry the target input power level through different states of the protocol interaction circuit. information, wherein the power of the power signal output by the signal output interface matches the target input power level.

In an embodiment of the present application, the protocol interaction circuit includes a plurality of first isolation circuits, each first isolation circuit is electrically connected to the first protocol circuit and the second protocol circuit, respectively, and the first isolation circuit is used for outputting the output of the first protocol circuit. The level of the signal is converted into a corresponding level and transmitted to the second protocol circuit; the combination of the level information of the signals exchanged by the first isolation circuits defines the state of the protocol exchange circuit.

In an embodiment of the present application, the first isolation circuit includes a light-emitting diode and a phototransistor, one end of the light-emitting diode is connected to the first protocol circuit, the other end is grounded, and the first end of the phototransistor is respectively connected to the second protocol circuit and the power supply terminal, The second terminal is grounded, and the control terminal is set corresponding to the light-emitting diode.

In an embodiment of the present application, the signal input interface and the second protocol circuit are electrically connected through a second isolation circuit, and the level information of the signals exchanged by the first isolation circuits and the level of the signals exchanged by the second isolation circuits The combination of information defines the state of the protocol interaction circuit.

In an embodiment of the present application, according to the power of the electrical energy signal that can be output by the signal output interface, there are several output power levels, and each input power level corresponds to several output power levels; the second protocol circuit is used to control the signal output The interface broadcasts several output power levels corresponding to the target input power level, and the control signal output interface outputs an electric energy signal corresponding to the power according to the output power level of the matched load device.

In an embodiment of the present application, the signal transmission device further includes a first voltage conversion circuit, the first voltage conversion circuit is electrically connected between the signal input interface and the signal output interface, and is also electrically connected to the second protocol circuit for converting The power signal input from the signal input interface is converted into a power signal conforming to the USB-PD protocol.

In an embodiment of the present application, the signal transmission device further includes a second voltage conversion circuit, and the second voltage conversion circuit is electrically connected between the signal input interface and the first voltage conversion circuit.

In an embodiment of the present application, the signal transmission device further includes a rectifier circuit, and the rectifier circuit is electrically connected to the signal input interface, the signal output interface, and the first protocol circuit, respectively.

In an embodiment of the present application, the signal transmission device further includes a signal conversion circuit, and the signal conversion circuit is electrically connected between the signal input interface and the signal output interface, and is used to convert the data signal input from the signal input interface into a conformance signal output The data signal of the protocol supported by the interface.

The beneficial effects of the present application are: different from the prior art, the present application provides a signal transmission device. The signal input interface of the signal transmission device supports POE (Power Over Ethernet, Active Ethernet) protocol, the first protocol circuit supports POE protocol, and the second protocol circuit supports USB-PD protocol. Wherein, the first protocol circuit is electrically connected to the second protocol circuit for converting the power signal input from the signal input interface into the power signal conforming to the USB-PD protocol.

In the above manner, the signal transmission device of the present application integrates the architecture of the POE protocol and the architecture of the USB-PD protocol, which can avoid the high-voltage AC input in the traditional power adapter that supports the USB-PD protocol, thereby avoiding the corresponding security risks. , which means that the signal transmission device of the present application is used for charging the load equipment, which can improve the safety of the charging process of the load equipment, and is especially suitable for application scenarios with high safety requirements. In addition, the signal transmission device of the present application integrates the advantages that the POE protocol is suitable for long-distance power supply, and has the advantages of simple wiring and low cost.

【Description of drawings】

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application. Furthermore, these drawings and written descriptions are not intended to limit the scope of the concepts of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by referring to specific embodiments.

1 is a schematic diagram of a circuit structure of an embodiment of a signal transmission device of the present application;

FIG. 2 is a schematic diagram of the circuit structure of an embodiment of a second protocol circuit and a signal output interface of the present application;

3 is a schematic diagram of a circuit structure of an embodiment of a protocol interaction circuit of the present application;

FIG. 4 is a schematic diagram of an embodiment of a work flow of the signal transmission device shown in FIG. 1;

FIG. 5 is a schematic diagram of the circuit structure of an embodiment of the first voltage conversion circuit of the present application;

FIG. 6 is a schematic diagram of a circuit structure of an embodiment of a second voltage conversion circuit of the present application.

【Detailed ways】

In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are part of the implementation of the present application. examples, but not all examples. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. The embodiments described below and features in the embodiments may be combined with each other without conflict.

The USB-PD protocol is a fast charging protocol developed by USB-IF (USB Implementers Forum). Traditional power adapters that support USB-PD usually use AC input, and their output power can reach up to 60W to 100W. They are used to charge consumer electronic products with fast charging interfaces such as mobile phones and computers. However, the input voltage of such adapters is high, which is prone to potential safety hazards (especially for application scenarios with high safety requirements), and is not suitable for long-distance power supply scenarios. The wiring is cumbersome and the cost is high during long-distance power supply.

POE protocol refers to the technology of providing DC power supply for such devices while transmitting data signals for IP-based terminals under the existing Ethernet Cat.5 cabling infrastructure. The POE protocol can ensure the normal operation of the existing network while ensuring the security of the existing structured cabling, and minimize the cost. The POE protocol is the latest standard specification for simultaneously transmitting data and electrical power using existing standard Ethernet transmission cables, and maintains compatibility with existing Ethernet systems and users. Moreover, the POE protocol can be applied to long-distance power supply, and has the advantages of simple wiring and low cost.

In order to solve the technical problems in the prior art that the safety of the charging process of the load device is low, the wiring is cumbersome and the cost is high during long-distance power supply, an embodiment of the present application provides a signal transmission device. The signal transmission device includes a signal input interface, the signal input interface is used for connecting a signal source device, and the signal input interface supports the POE protocol. The signal transmission device further includes a protocol circuit, and the protocol circuit can be used to perform power conversion between the signal transmission interface supporting the POE protocol and the signal transmission interface supporting the USB-PD protocol. The protocol circuit may include a first protocol circuit and a second protocol circuit. That is, the signal transmission device further includes a first protocol circuit, the first protocol circuit supports the POE protocol, and the first protocol circuit is electrically connected to the signal input interface. The signal transmission device further includes a second protocol circuit, the second protocol circuit supports the USB-PD protocol, the second protocol circuit is electrically connected to the signal input interface and the first protocol circuit respectively, and is used for converting the power signal input from the signal input interface into Power signal conforming to USB-PD protocol. The signal transmission device further includes a signal output interface, which is electrically connected to the signal input interface and the second protocol circuit respectively, and is used for outputting a power signal conforming to the USB-PD protocol to the load device. Details are described below.

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of a circuit structure of an embodiment of a signal transmission apparatus of the present application.

In one embodiment, the signal transmission device is used to connect the signal source device to transmit the signal input from the signal source device to the signal transmission device. The signal transmission device can also be connected to a load device, and the signal source device can provide a power signal, so as to transmit the power signal provided by the signal source device to the load device, thereby charging the load device. Of course, the signal source device can also provide data signals, and the signal transmission device transmits the data signals provided by the signal source device to the load device, so as to realize the interaction of the data signals.

The signal transmission device includes a signal input interface 10, the signal input interface 10 is used for connecting a signal source device, and the signal input interface 10 supports the POE protocol. That is to say, the signal input from the signal input interface 10 conforms to the POE protocol, and may include the above-mentioned power signal and data signal. The signal source device connected to the signal input interface 10 provides power in the technology of applying the POE protocol, so the signal source device is also called PSE (Power Sourcing Equipment, power supply equipment). Of course, the signal source device can also provide data signals that need to be interacted.

Optionally, the signal input interface 10 may be RJ45 (Registered Jack 45), etc., which is used as a medium for the power signal and the data signal to enter the signal transmission device. RJ45 is a kind of information socket connector in a wiring system, which is usually composed of a plug (or a connector, a crystal head) and a socket (or a module), which belongs to the understanding of those skilled in the art and will not be repeated here.

Moreover, the power signal input from the signal input interface 10 conforms to the POE protocol, and the data signal input from the signal input interface 10 conforms to the IEEE 802.3 standard. Among them, the IEEE802.3 standard is a collection of Institute of Electrical and Electronics Engineers (IEEE) standards, which belongs to the understanding category of those skilled in the art, and will not be repeated here. The signal transmission device further includes a first protocol circuit 20 , and the first protocol circuit 20 is electrically connected to the signal input interface 10 . The first protocol circuit 20 supports the POE protocol and is used to complete protocol communication with the signal source device, mainly including detection, device classification, power supply control, and power supply management. Optionally, the first protocol circuit 20 may adopt an integrated chip or the like.

Specifically, the first protocol circuit 20 can identify whether the signal source device connected to the detection signal input interface 10 conforms to IEEE802.3af, IEEE802.3at, IEEE802.3bt and other standards, and can also classify and indicate according to the power supply capability of the signal source device (explained in detail below). In addition, the first protocol circuit 20 can also perform power supply control and power supply management for the signal source device. For example, the first protocol circuit 20 can control the signal source device to start supplying power; or when the first protocol circuit 20 recognizes that the output power of the signal transmission device is At zero time, the signal source device can be controlled to stop power supply; or when a short circuit occurs inside the signal transmission device, the first protocol circuit 20 can control the signal source device to stop power supply to protect the circuit structure inside the signal transmission device.

The signal transmission apparatus further includes a second protocol circuit 30 , and the second protocol circuit 30 is electrically connected to the signal input interface 10 and the first protocol circuit 20 respectively. The second protocol circuit 30 supports the USB-PD protocol, and through the protocol communication between the first protocol circuit 20 and the second protocol circuit 30, the power signal input from the signal input interface 10 is converted into power conforming to the USB-PD protocol. signal, and then can quickly charge the load device based on USB-PD technology. Optionally, the second protocol circuit 30 may use an integrated chip or the like.

The signal transmission device also includes a signal output interface 40, which is electrically connected to the signal input interface 10 and the second protocol circuit 30, respectively, for outputting the above converted power signal conforming to the USB-PD protocol, so as to communicate with the signal output interface. 40 connected load devices for fast charging. The second protocol circuit 30 can perform charging protocol negotiation and power supply management with the load device connected to the signal output interface 40, so as to provide the load device with a power signal required for its charging. FIG. 2 shows the actual circuit design of the second protocol circuit 30 and the signal output interface 40 , which is only an example, and does not limit the specific circuit design of the second protocol circuit 30 and the signal output interface 40 .

Of course, the signal output interface 40 can also output the data signal input from the signal input interface 10 .

Optionally, the signal output interface 40 may be a type of interface such as USB Type-C. The power signal output by the signal output interface 40 conforms to the USB-PD protocol, and the data signal output by the signal output interface 40 conforms to the USB standard, such as the USB 3.0 standard.

In other words, the signal transmission device further includes a protocol circuit, which is electrically connected to the signal input interface 10 and the signal output interface 40 respectively. The protocol circuit can be used to convert the power signal input from the signal input interface 10 and conforming to the POE protocol into a power signal conforming to the USB-PD protocol. The signal output interface 40 can output a power signal conforming to the USB-PD protocol to the load device.

It can be seen from the above that the signal transmission device of the present application integrates the architecture of the POE protocol and the architecture of the USB-PD protocol, which can avoid the high-voltage AC input in the traditional power adapter supporting the USB-PD protocol, thereby avoiding the corresponding safety The hidden danger means that the signal transmission device of the present application is used for charging the load equipment, which can improve the safety of the charging process of the load equipment, and is especially suitable for application scenarios with high safety requirements. In addition, the signal transmission device of the present application integrates the advantages that the POE protocol is suitable for long-distance power supply, and has the advantages of simple wiring and low cost.

In addition, compared with the traditional technology using the POE protocol, the signal transmission device of the present application can realize the interaction of power distribution among multiple load devices because the USB-PD protocol supports the interaction mode of handshake, so it can be used in the POE protocol. Based on the architecture of the USB-PD protocol, multiple load devices can be charged at the same time. The embodiments of the present application are described by taking one signal input interface 10 and one signal output interface 40 as examples, and it is only an example. It is obtained from the circuit structure topology of , and will not be repeated here.

In an exemplary embodiment, the signal transmission device further includes a casing (not shown), and the above circuit structures including the signal input interface 10, the first protocol circuit 20, the second protocol circuit 30, and the signal output interface 40 are all provided in the The casing plays the role of bearing and protecting the circuit structure of the signal transmission device.

Please continue to refer to Figure 1. In an embodiment, the POE protocol is divided into several input power levels according to the power of the signal source device, and the input power level is used to measure the power supply capability of the signal source device. For example, the input power levels may include Class3 (15W), Class4 (25.5W), Class5-6 (40W), and Class7-8 (71W).

When the signal source device is connected to the signal input interface 10, the first protocol circuit 20 can detect the condition of the signal source device on the line, and can classify the power supply capability of the signal source device, that is, identify the input corresponding to the signal source device. power level, and indicate the corresponding input power level of the signal source device. Specifically, the first protocol circuit 20 can identify the target input power level, where the target input power level is the input power level of the signal source device currently connected to the signal input interface 10 . It can be understood that different signal source devices currently connected to the signal input interface 10 may have different target input power levels.

Please refer to FIG. 3 together. FIG. 3 is a schematic diagram of a circuit structure of an embodiment of a protocol interaction circuit of the present application.

The protocol circuit further includes a protocol interaction circuit 50, and the protocol interaction circuit 50 may refer to the following description.

The signal transmission device further includes a protocol interaction circuit 50, which is electrically connected between the first protocol circuit 20 and the second protocol circuit 30 to carry information of the target input power level through different states of the protocol interaction circuit 50, wherein The power of the power signal output by the signal output interface 40 matches the target input power level.

That is to say, when the first protocol circuit 20 recognizes the input power level of the signal source device currently connected to the signal input interface 10, that is, the first protocol circuit 20 recognizes the target input power level, the different states of the protocol interaction circuit 50 can be passed through. The information carrying the target input power level is exchanged to indicate the target input power level to the second protocol circuit 30, and then the second protocol circuit 30 adjusts the power of the power signal output by the signal output interface 40 to match the target input power level.

In the above manner, the first protocol circuit 20 and the second protocol circuit 30 conduct protocol communication through the protocol interaction circuit 50 to carry the information of the target input power level interactively, so that the power signal conforming to the POE protocol can be converted into a power signal conforming to the USB-PD The power signal of the protocol is output, that is, the integration of the POE protocol architecture and the USB-PD protocol architecture is realized.

In one embodiment, the protocol interaction circuit 50 includes a plurality of first isolation circuits 51, each of which is electrically connected to the first protocol circuit 20 and the second protocol circuit 30, respectively. The first isolation circuit 51 is used to The level of the signal output by the circuit 20 is converted into a corresponding level and transmitted to the second protocol circuit 30 .

In other words, the low-level signal output by the first protocol circuit 20 can be converted into a corresponding low-level signal or a high-level signal by the first isolation circuit 51 and transmitted to the second protocol circuit 30 . The high-level signal output by the first protocol circuit 20 can be converted into a corresponding low-level signal or a high-level signal by the first isolation circuit 51 and transmitted to the second protocol circuit 30 .

The corresponding relationship between the level of the signal output by the first protocol circuit 20 and the level of the signal received by the second protocol circuit 30 is the level information of the signal exchanged by the first isolation circuit 51 . For example, the first protocol circuit 20 outputs a low-level signal, and after being converted by the first isolation circuit 51, a high-level signal is formed and transmitted to the second protocol circuit 30, and the low-level signal output by the first protocol circuit 20 is consistent with the second protocol. The corresponding relationship of the high-level signals received by the circuit 30 is the level information of the signals exchanged by the first isolation circuit 51 .

The combination of the level information of the signals exchanged by each of the first isolation circuits 51 defines the state of the protocol exchange circuit 50 . That is to say, in the protocol interaction circuit 50 in different states, the level information of the signals exchanged by at least part of the first isolation circuits 51 in each of the first isolation circuits 51 included in the protocol interaction circuit 50 is different, so that the different states of the protocol interaction circuit 50 can be used to determine Describes different target input power levels.

In one embodiment, the first isolation circuit 51 adopts an isolation circuit, which can avoid mutual interference of electrical signals between the first protocol circuit 20 and the second protocol circuit 30, and can avoid the first protocol circuit 20 and the second protocol circuit 30. common ground, thereby preventing the first voltage conversion circuit and the second voltage conversion circuit described below from working normally.

Specifically, the first isolation circuit 51 includes a light emitting diode 52 and a phototransistor 53 . One end of the light emitting diode 52 is connected to the first protocol circuit 20, and the other end is grounded. The first end 531 of the phototransistor 53 is respectively connected to the second protocol circuit 30 and the power supply end 54 , the second end 532 is grounded, and the control end 533 is set corresponding to the light emitting diode 52 , as shown in FIG. 3 .

When the first protocol circuit 20 outputs a high-level signal, the light-emitting diode 52 is driven to emit light, so that the control end of the phototransistor 53 receives the light from the light-emitting diode 52, so that the first end 531 and the second end 532 of the phototransistor 53 conduct At this time, the second protocol circuit 30 receives a low-level signal; and when the first protocol circuit 20 outputs a low-level signal, the light-emitting diode 52 will not emit light, and the first end 531 and the second end of the phototransistor 53 532 is not turned on, at this time, the second protocol circuit 30 receives the high-level signal output by the power supply terminal.

It can be understood that the power supply terminal 54 provides a high-level signal to the first isolation circuit 51, and the power supply terminal 54 can be connected to the signal input interface 10 to provide the first isolation circuit 51 when the signal input interface 10 is connected to the signal source device. high level signal. Of course, the signal transmission device may be additionally provided with a power supply, and the power supply terminal 54 is connected to the power supply to provide a high-level signal to the first isolation circuit 51 .

Obviously, in other embodiments of the present application, the first isolation circuit 51 may adopt other forms of isolation circuits, such as magnetic coupling isolation circuits, etc., which are not limited herein.

The signal input interface 10 and the second protocol circuit 30 are electrically connected through the second isolation circuit 55 , and the combined definition of the level information of the signals exchanged by the first isolation circuits 51 and the level information of the signals exchanged by the second isolation circuit 55 Status of the protocol interaction circuit 50 . That is, the second isolation circuit 55 participates in defining the state of the protocol interaction circuit 50 in this embodiment. The level information of the signals exchanged by the second isolation circuit 55 is the corresponding relationship between the level of the signal output by the signal input interface 10 and the level of the signal received by the second protocol circuit 30 .

The second isolation circuit 55 may have a similar circuit structure to the first isolation circuit 51 , the only difference being that the ungrounded end of the light emitting diode 52 in the second isolation circuit 55 is connected to the signal input interface 10 . When the signal input interface 10 is connected to the signal source device, the signal input interface 10 outputs a high-level signal, and the second protocol circuit 30 receives a low-level signal; and when the signal input interface 10 is not connected to the signal source device, the signal input The interface 10 outputs a low-level signal, and the second protocol circuit 30 receives a high-level signal. It can be seen that the level information of the signals exchanged by the second isolation circuit 55 is used to describe whether the signal input interface 10 is connected to the signal source device.

In one embodiment, the USB-PD protocol is divided into several output power levels according to the power of the power signal that the signal output interface 40 can output. The output power level represents the power supply capability of the signal output interface 40 .

Optionally, in this embodiment, the voltage and current of the power signal output by the signal output interface 40 may be used to describe the output power level. For example, the output power level may include 5V/3A (15W), 9V/2A (18W), 12V/2A ( 24W), 15V/3A (45W), 20V/3A (60W), etc., in line with the USB-PD protocol.

Each input power level corresponds to several output power levels. The second protocol circuit 30 is used to control the signal output interface 40 to broadcast the several output power levels corresponding to the target input power level, that is, the signal output interface 40 broadcasts all the output power levels corresponding to the target input power level to indicate that the signal output interface 40 can the power supply capability provided. The second protocol circuit 30 interacts with the load device through the signal output interface 40 to determine the output power level that matches the load device among the output power levels broadcast by the signal output interface 40, and the second protocol circuit 30 controls the signal output interface 40 to match the load device according to the output power level. The output power level of the output power level outputs the power signal corresponding to the power, that is, the power signal corresponding to the voltage and current is output. For example, in the output power level broadcasted by the signal output interface 40 , 15V/3A is required for charging the load device, so the signal output interface 40 outputs a 15V/3A power signal to charge the load device.

The corresponding relationship between the input power level and the output power level is shown in the following table (1):

The following describes the process of realizing power signal conversion based on the protocol communication between the first protocol circuit 20 and the second protocol circuit 30 .

For example, the first protocol circuit 20 has a channel CH1, a channel CH2 and a channel CH3, the signal input interface 10 has a channel CH4, and the second protocol circuit 30 has a channel CH5, a channel CH6, a channel CH7 and a channel CH8. The channel CH1 and the channel CH5, the channel CH2 and the channel CH6, and the channel CH3 and the channel CH7 are respectively electrically connected through the first isolation circuit 51, and the channel CH4 and the channel CH8 are electrically connected through the second isolation circuit 55.

As shown in the following table (2):

It can be seen that Table (2) shows the level of the electrical signals from the channel CH1 to the channel CH8 when the first protocol circuit 20 and the second protocol circuit 30 exchange information of different input power levels, where "0" Indicates a low-level signal, and "1" indicates a high-level signal.

Please refer to FIG. 1 , FIG. 3 and FIG. 4 . FIG. 4 is a schematic diagram of an embodiment of a work flow of the signal transmission apparatus shown in FIG. 1 .

S101: Determine whether the signal input interface is connected to the signal source device;

In this embodiment, if the signal input interface 10 has been connected to the signal source device, step S102 is performed; if the signal input interface 10 is not connected to the signal source device, step S101 is continued.

The first protocol circuit 20 can identify whether the signal input interface 10 is connected to a signal source device. When the signal input interface 10 is connected to the signal source device, the channel CH4 of the signal input interface 10 will output a high-level signal, and the channel CH8 of the second protocol circuit 30 will receive a low-level signal; and when the signal input interface 10 is not connected When the signal source device is input, the channel CH4 of the signal input interface 10 will output a low-level signal, and the channel CH8 of the second protocol circuit 30 will receive a high-level signal.

S102: The first protocol circuit determines the target input power level;

In this embodiment, after the signal input interface 10 is connected to the signal source device, the first protocol circuit 20 detects the signal source device on the line to classify the power supply capability of the signal source device, and then determines that the signal input interface 10 is currently connected The input power level of the signal source device, that is, to determine the target input power level.

S103: The first protocol circuit and the second protocol circuit carry the information of the target input power level interactively;

In this embodiment, after the first protocol circuit 20 determines the target input power level, the first protocol circuit 20 needs to exchange information carrying the target input power level with the second protocol circuit 30, so that the second protocol circuit 30 can control the signal The power of the power signal output by the output interface 40 matches the target input power level, which requires the second protocol circuit 30 to be able to determine each output power level corresponding to the target input power level.

Based on the above table (1) and table (2), when the target input power level is Class 7-8, the electrical signal levels of the channel CH1, channel CH2 and channel CH3 of the first protocol circuit 20 are 0 and 0 in sequence. , 0, then the levels of the electrical signals of the channel CH5 , the channel CH6 , and the channel CH7 of the second protocol circuit 30 are 1, 1, and 1 in sequence. The second protocol circuit 30 learns that the minimum output power of the current signal source device is 71W, and therefore determines that the output power levels corresponding to the target input power levels are 20V/3A (60W), 15V/3A (45W), 12V/3A (36W) respectively ), 9V/3A(27W), 5V/3A(15W), and broadcast through the signal output interface 40, indicating that the signal output interface 40 can provide 20V/3A(60W), 15V/3A(45W), 12V/3A( 36W), 9V/3A (27W), 5V/3A (15W) power supply.

When the target input power level is Class5-6, the electrical signal levels of the channel CH1, channel CH2 and channel CH3 of the first protocol circuit 20 are 0, 1, and 0 in sequence, then the channels CH5, The levels of the electrical signals of channel CH6 and channel CH7 are 1, 0, and 1 in sequence. The second protocol circuit 30 learns that the output power of the current signal source device is at least 40W, and therefore determines that the output power levels corresponding to the target input power levels are 20V/1A (20W), 15V/2A (30W), 12V/3A (36W) respectively ), 9V/3A (27W), 5V/3A (15W), and broadcast through the signal output interface 40, indicating that the signal output interface 40 can provide 20V/1A (20W), 15V/2A (30W), 12V/3A ( 36W), 9V/3A (27W), 5V/3A (15W) power supply.

When the target input power level is Class4, the electrical signal levels of the channel CH1, channel CH2 and channel CH3 of the first protocol circuit 20 are 1, 0, and 0 in sequence, then the channel CH5 and channel CH6 of the second protocol circuit 30 , The level of the electrical signal of channel CH7 is 0, 1, 1 in turn. The second protocol circuit 30 learns that the minimum output power of the current signal source device is 25.5W, and therefore determines that the output power levels corresponding to the target input power levels are 20V/1A (20W), 15V/1A (15W), 12V/2A ( 24W), 9V/2A (18W), 5V/3A (15W), and broadcast through the signal output interface 40, indicating that the signal output interface 40 can provide (20W), 15V/1A (15W), 12V/2A (24W) , 9V/2A(18W), 5V/3A(15W) power supply.

When the target input power level is Class3, the electrical signal levels of the channel CH1, channel CH2 and channel CH3 of the first protocol circuit 20 are 1, 1, and 0 in sequence, then the channel CH5 and channel CH6 of the second protocol circuit 30 , The level of the electrical signal of channel CH7 is 0, 0, 1 in turn. The second protocol circuit 30 learns that the output power of the current signal source device is at least 15W, so it determines that the output power level corresponding to the target input power level is 5V/2A (10W), and broadcasts through the signal output interface 40 to indicate the signal output interface 40 Can provide 5V/2A (10W) power supply.

S104: The second protocol circuit control signal output interface broadcasts all output power levels corresponding to the target input power level;

In this embodiment, after the second protocol circuit 30 determines each output power level corresponding to the target output power level, the second protocol circuit 30 controls the signal output interface 40 to broadcast each output power level corresponding to the target input power level, and the control signal The output interface 40 outputs the power signal corresponding to the power according to the output power level of the matched load device, as described above.

Please refer to FIG. 1 and FIG. 5 . FIG. 5 is a schematic diagram of a circuit structure of an embodiment of the first voltage conversion circuit of the present application.

In one embodiment, the signal transmission device further includes a first voltage conversion circuit 60, and the first voltage conversion circuit 60 is electrically connected between the signal input interface 10 and the signal output interface 40, and is also electrically connected to the second protocol circuit 30 for using It is used to convert the power signal input from the signal input interface 10 into a power signal conforming to the USB-PD protocol.

Specifically, after the information carrying the target input power level is exchanged between the first protocol circuit 20 and the second protocol circuit 30, the second protocol circuit 30 determines the target output power level, and the first voltage conversion circuit 60 uses the signal input interface 10 The inputted power signal is input, and the second protocol circuit 30 controls the first voltage conversion circuit 60 to output the power signal of the voltage and current corresponding to the target output power level.

Optionally, the first voltage conversion circuit 60 may be a Buck circuit (ie, a step-down conversion circuit) or the like. Buck circuit is a DC-DC (direct current to direct current) conversion circuit, which converts the input DC voltage into high-frequency pulses through an oscillating circuit, and then outputs the required DC voltage through a pulse transformer and a rectifier filter circuit, which belongs to the technology in the art The scope of personnel's understanding will not be repeated here. The first voltage conversion circuit 60 may be a chip with a high duty cycle, which is not limited herein.

Further, please also refer to FIG. 6 , the signal transmission device further includes a second voltage conversion circuit 70 , and the second voltage conversion circuit 70 is electrically connected between the signal input interface 10 and the first voltage conversion circuit 60 . That is to say, the first voltage conversion circuit 60 and the second voltage conversion circuit 70 jointly participate in the conversion of the power signal, and the two work together, so that the signal transmission device of this embodiment has higher efficiency and good reliability.

For example, after the signal source device is connected to the signal input interface 10, the first protocol circuit 20 determines the target input power level, and the second protocol circuit 30 determines the target output power level. After that, the signal input interface 10 inputs the direct current of 40V-58V (for example, 40V-58V/2A), which is converted into direct current of 21V-25V (for example, 21V/3.5A) after passing through the second voltage conversion circuit 70, and then passes through the first voltage. The conversion circuit 60 outputs a 5V-20V/3A power signal, that is, converts it into a power signal conforming to the USB-PD protocol, such as 5V/3A, 9V/2A, 12V/2A, 15V/3A, 20V/3A and other power signals, At the same time, it also supports the PPS (Programmable Power Supply) protocol, which is finally output from the signal output interface 40 .

Optionally, the second voltage conversion circuit 70 may be an isolated DC-DC conversion circuit, the second voltage conversion circuit 70 adopts a clamp active forward circuit, and the primary winding and the secondary winding of the transformer in the second voltage conversion circuit 70 The isolation between the windings has the advantages of high efficiency and small size of the transformer.

Please continue to refer to Figure 1. In one embodiment, the signal transmission device further includes a rectifier circuit 80 . The rectifier circuit 80 is electrically connected to the signal input interface 10 , the signal output interface 40 and the first protocol circuit 20 respectively. The rectification circuit 80 is used to rectify the power signal input from the signal input interface 10 .

Optionally, the rectifier circuit 80 may adopt a separate circuit or an integrated chip, etc., to realize its rectification function, which is not limited herein.

Please continue to refer to Figure 1. In one embodiment, the signal transmission device further includes a signal conversion circuit 90 . The signal conversion circuit 90 is electrically connected between the signal input interface 10 and the signal output interface 40. Specifically, the signal conversion circuit 90 is connected in parallel with the above-mentioned first voltage conversion circuit 60 and second voltage conversion circuit 70 to the signal input interface 10 and the signal output. between the interfaces 40 . The signal conversion circuit 90 is used to convert the data signal input from the signal input interface 10 into a data signal conforming to the protocol supported by the signal output interface 40 .

Specifically, the data signal input from the signal input interface 10 is Ethernet data, and the data signal converted by the signal conversion circuit 90 conforms to the USB standard, such as the USB 3.0 standard, and is then output from the signal output interface 40 . As for the specific principle of the signal conversion circuit 90 to realize the data signal conversion, it belongs to the understanding of those skilled in the art, and will not be repeated here.

To sum up, the signal transmission device of the present application integrates the architecture of the POE protocol and the architecture of the USB-PD protocol, which can avoid the high-voltage AC input in the traditional power adapter supporting the USB-PD protocol, thereby avoiding the corresponding safety The hidden danger means that the signal transmission device of the present application is used for charging the load equipment, which can improve the safety of the charging process of the load equipment, and is especially suitable for application scenarios with high safety requirements. In addition, the signal transmission device of the present application integrates the advantages that the POE protocol is suitable for long-distance power supply, and has the advantages of simple wiring and low cost.

In addition, in this application, unless otherwise expressly specified and limited, the terms "connected", "connected (electrically connected)", "stacked" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a Disassembly and connection, or integration; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application. scope.

Claims

A signal transmission device, wherein the signal transmission device comprises:

a signal input interface for connecting to a signal source device, and the signal input interface supports the POE protocol;

The first protocol circuit supports the POE protocol and is electrically connected to the signal input interface;

The second protocol circuit supports the USB-PD protocol, the second protocol circuit is electrically connected to the signal input interface and the first protocol circuit respectively, and is used to convert the power signal input from the signal input interface into a USB-compliant - Power signal of PD protocol;

The signal output interface is electrically connected to the signal input interface and the second protocol circuit respectively, and is used for outputting the power signal conforming to the USB-PD protocol to the load device.
The signal transmission device according to claim 1, wherein,

According to the power of the power signal that can be provided by the signal source device, there are several input power levels, and the first protocol circuit can identify a target input power level, and the target input power level is the one currently connected to the signal input interface. The input power level of the signal source device;

The signal transmission device further includes a protocol interaction circuit, which is electrically connected between the first protocol circuit and the second protocol circuit, so as to carry the target through different states of the protocol interaction circuit. Input power level information, wherein the power of the power signal output by the signal output interface matches the target input power level.
The signal transmission device according to claim 2, wherein,

The protocol interaction circuit includes a plurality of first isolation circuits, each of which is electrically connected to the first protocol circuit and the second protocol circuit, and the first isolation circuit is used to connect the first protocol circuit. The level of the signal output by the circuit is converted into a corresponding level and transmitted to the second protocol circuit;

The combination of the level information of the signals exchanged by each of the first isolation circuits defines the state of the protocol exchange circuit.
The signal transmission device according to claim 3, wherein the first isolation circuit comprises a light emitting diode and a phototransistor, one end of the light emitting diode is connected to the first protocol circuit, and the other end is grounded, and the third end of the phototransistor is connected to the ground. One end is respectively connected to the second protocol circuit and the power supply end, the second end is grounded, and the control end is set corresponding to the light emitting diode.
The signal transmission device according to claim 3, wherein the signal input interface and the second protocol circuit are electrically connected through a second isolation circuit, and the level of the signals exchanged by the first isolation circuits The combination of information and level information of the signals exchanged by the second isolation circuit defines the state of the protocol exchange circuit.
The signal transmission device according to claim 2, wherein,

According to the power of the electrical energy signal that can be output by the signal output interface, a number of output power levels are divided, and each of the input power levels corresponds to a number of the output power levels;

The second protocol circuit is configured to control the signal output interface to broadcast the plurality of output power levels corresponding to the target input power level, and control the signal output interface to output corresponding power according to the output power level of the matching load device power signal.
The signal transmission device according to claim 1, wherein the signal transmission device further comprises a first voltage conversion circuit, the first voltage conversion circuit is electrically connected between the signal input interface and the signal output interface, It is also electrically connected to the second protocol circuit for converting the power signal input from the signal input interface into a power signal conforming to the USB-PD protocol.
The signal transmission device according to claim 7, wherein the signal transmission device further comprises a second voltage conversion circuit, the second voltage conversion circuit is electrically connected between the signal input interface and the first voltage conversion circuit between.
The signal transmission device according to claim 1, wherein the signal transmission device further comprises a rectifier circuit, and the rectifier circuit is respectively electrically connected to the signal input interface, the signal output interface and the first protocol circuit.
The signal transmission device according to claim 1, wherein the signal transmission device further comprises a signal conversion circuit, the signal conversion circuit is electrically connected between the signal input interface and the signal output interface, and is used for converting the self- The data signal input by the signal input interface is converted into a data signal conforming to the protocol supported by the signal output interface.
The signal transmission device according to claim 1, wherein the signal transmission device further comprises a rectification circuit, a first voltage conversion circuit and a second voltage conversion circuit; the rectification circuit is electrically connected to the signal input interface, the a signal output interface and the first protocol circuit; the first voltage conversion circuit is electrically connected between the signal input interface and the signal output interface, and is also electrically connected to the second protocol circuit for converting the self- The power signal input by the signal input interface is converted into a power signal conforming to the USB-PD protocol; the second voltage conversion circuit is electrically connected between the signal input interface and the first voltage conversion circuit; the rectifier circuit It is electrically connected between the signal input interface and the second voltage conversion circuit.
The signal transmission device according to claim 11, wherein the signal transmission device further comprises a signal conversion circuit, the signal conversion circuit is electrically connected between the signal input interface and the signal output interface, and is used for converting the self- The data signal input by the signal input interface is converted into a data signal conforming to the protocol supported by the signal output interface.
The signal transmission device according to claim 12, wherein, according to the power of the power signal that the signal source device can provide, there are several input power levels, the first protocol circuit can identify the target input power level, the The target input power level is the input power level of the signal source device currently connected to the signal input interface;

The signal transmission device further includes a protocol interaction circuit, which is electrically connected between the first protocol circuit and the second protocol circuit, so as to carry the target through different states of the protocol interaction circuit. Input power level information, wherein the power of the power signal output by the signal output interface matches the target input power level.
The signal transmission device according to claim 13, wherein:

The protocol interaction circuit includes a plurality of first isolation circuits, each of which is electrically connected to the first protocol circuit and the second protocol circuit, and the first isolation circuit is used to connect the first protocol circuit. The level of the signal output by the circuit is converted into a corresponding level and transmitted to the second protocol circuit;

The combination of the level information of the signals exchanged by each of the first isolation circuits defines the state of the protocol exchange circuit.
The signal transmission device according to claim 14, wherein the first isolation circuit comprises a light emitting diode and a phototransistor, one end of the light emitting diode is connected to the first protocol circuit, and the other end is grounded, and the phototransistor The first end of the device is respectively connected to the second protocol circuit and the power supply end, the second end is grounded, and the control end is set corresponding to the light emitting diode.
A signal transmission device, wherein the signal transmission device comprises:

a signal input interface for connecting to a signal source device, and the signal input interface supports the POE protocol;

The signal output interface is used to output the power signal conforming to the USB-PD protocol to the load device.

a protocol circuit, electrically connected to the signal input interface and the signal output interface respectively, for converting the power signal input from the signal input interface and conforming to the POE protocol into the power signal conforming to the USB-PD protocol .
The signal transmission device according to claim 16, wherein the protocol circuit comprises a first protocol circuit and a second protocol circuit, the first protocol circuit supports the POE protocol and is electrically connected to the signal input interface; the second protocol circuit supports USB-PD protocol, the second protocol circuit is electrically connected to the signal input interface and the first protocol circuit respectively, and is used to convert the power signal input from the signal input interface into the USB-PD protocol compliant power signal; the signal output interface is electrically connected to the signal input interface and the second protocol circuit respectively.
The signal transmission device according to claim 17, wherein, according to the power of the power signal that the signal source device can provide, there are several input power levels, the first protocol circuit can identify the target input power level, the The target input power level is the input power level of the signal source device currently connected to the signal input interface;

The protocol circuit further includes a protocol interaction circuit, which is electrically connected between the first protocol circuit and the second protocol circuit to carry the target input through different states of the protocol interaction circuit. Power level information, wherein the power of the power signal output by the signal output interface matches the target input power level.
The signal transmission device according to claim 18, wherein the protocol interaction circuit comprises a plurality of first isolation circuits, and each of the first isolation circuits is electrically connected to the first protocol circuit and the second protocol circuit, respectively, The first isolation circuit is used to convert the level of the signal output by the first protocol circuit into a corresponding level and transmit it to the second protocol circuit;

The combination of the level information of the signals exchanged by each of the first isolation circuits defines the state of the protocol exchange circuit.
The signal transmission device according to claim 19, wherein the first isolation circuit comprises a light-emitting diode and a phototransistor, one end of the light-emitting diode is connected to the first protocol circuit, and the other end is grounded, and the phototransistor The first end of the device is respectively connected to the second protocol circuit and the power supply end, the second end is grounded, and the control end is set corresponding to the light emitting diode.