CN115150676A - Signal transmission device - Google Patents
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- CN115150676A CN115150676A CN202110343188.XA CN202110343188A CN115150676A CN 115150676 A CN115150676 A CN 115150676A CN 202110343188 A CN202110343188 A CN 202110343188A CN 115150676 A CN115150676 A CN 115150676A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/02—Constructional details
- H04Q1/028—Subscriber network interface devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/02—Constructional details
- H04Q1/03—Power distribution arrangements
Abstract
The invention relates to the technical field of electronic equipment and discloses a signal transmission device. The signal input interface of the signal transmission device supports a POE protocol, the first protocol circuit supports the POE protocol, and the second protocol circuit supports a USB-PD protocol. The first protocol circuit is electrically connected with the second protocol circuit and used for converting the electric energy signal input from the signal input interface into an electric energy signal conforming to the USB-PD protocol. Through the mode, the safety of the charging process of the load equipment can be improved, and the load equipment is simple and easy to wire and low in cost.
Description
Technical Field
The present invention relates to the field of electronic devices, and in particular, to a signal transmission device.
Background
At present, a Power adapter supporting a USB-PD (USB Power Delivery, power transfer protocol) generally uses an ac input as a main input, and its output Power can reach 60W to 100W at most, and is used for charging consumer electronic products with a fast charging interface, such as a mobile phone and a computer. However, such an adapter has a high input voltage, and is prone to potential safety hazards (especially for application scenarios with high safety requirements).
Disclosure of Invention
In view of the above, the present invention provides a signal transmission device, which can improve the safety of the charging process of the load device, and has the advantages of simple wiring and low cost.
In order to solve the technical problems, the invention adopts a technical scheme that: a signal transmission apparatus is provided. The signal transmission device comprises a signal input interface, wherein the signal input interface is used for being connected with signal source equipment, and the signal input interface supports a POE protocol. The signal transmission device further comprises a first protocol circuit, the first protocol circuit supports a POE protocol, and the first protocol circuit is electrically connected with the signal input interface. The signal transmission device further comprises a second protocol circuit, the second protocol circuit supports a USB-PD protocol, and the second protocol circuit is respectively and electrically connected with the signal input interface and the first protocol circuit and used for converting the electric energy signal input from the signal input interface into an electric energy signal conforming to the USB-PD protocol. The signal transmission device also comprises a signal output interface which is respectively and electrically connected with the signal input interface and the second protocol circuit and used for outputting the electric energy signal which accords with the USB-PD protocol to the load equipment.
In an embodiment of the present invention, a plurality of input power levels are divided according to the power of an electrical energy signal that can be provided by a signal source device, a first protocol circuit can identify a target input power level, and the target input power level is the input power level of the signal source device currently connected to a signal input interface; the signal transmission device further comprises a protocol interaction circuit which is electrically connected between the first protocol circuit and the second protocol circuit so as to carry information of the target input power level in an interaction mode through different states of the protocol interaction circuit, wherein the power of the electric energy signal output by the signal output interface is matched with the target input power level.
In an embodiment of the present invention, the protocol interaction circuit includes a plurality of first isolation circuits, each of the first isolation circuits is electrically connected to the first protocol circuit and the second protocol circuit, and the first isolation circuits are configured to convert a level of a signal output by the first protocol circuit into a corresponding level and transmit the level to the second protocol circuit; the combination of the level information of the signals interacted by each first isolation circuit defines the state of the protocol interaction circuit.
In an embodiment of the present invention, 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 of the light emitting diode is grounded, the first end of the phototransistor is respectively connected to the second protocol circuit and the power supply terminal, the second end of the phototransistor is grounded, and the control terminal is disposed corresponding to the light emitting diode.
In an embodiment of the present invention, the signal input interface and the second protocol circuit are electrically connected through a second isolation circuit, and a combination of level information of signals interacted by each first isolation circuit and level information of signals interacted by the second isolation circuit defines a state of the protocol interaction circuit.
In an embodiment of the present invention, a plurality of output power levels are divided according to the power of the electric energy signal that can be output by the signal output interface, and each input power level corresponds to a plurality of output power levels; the second protocol circuit is used for controlling the signal output interface to broadcast a plurality of output power grades corresponding to the target input power grade, and controlling the signal output interface to output an electric energy signal with corresponding power according to the output power grade of the matched load equipment.
In an embodiment of the invention, 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, and is configured to convert the power signal input from the signal input interface into a power signal conforming to a USB-PD protocol.
In an embodiment of the invention, the signal transmission apparatus further includes a second voltage conversion circuit electrically connected between the signal input interface and the first voltage conversion circuit.
In an embodiment of the invention, the signal transmission apparatus further includes a rectifying circuit, and the rectifying circuit is electrically connected to the signal input interface, the signal output interface, and the first protocol circuit, respectively.
In an embodiment of the invention, the signal transmission apparatus further includes a signal conversion circuit, electrically connected between the signal input interface and the signal output interface, for converting the data signal input from the signal input interface into a data signal conforming to a protocol supported by the signal output interface.
The beneficial effects of the invention are: different from the prior art, the invention provides a signal transmission device. The signal input interface of the signal transmission device supports a POE (Power Over Ethernet) protocol, the first protocol circuit supports the POE protocol, and the second protocol circuit supports a USB-PD protocol. The first protocol circuit is electrically connected with the second protocol circuit and used for converting the electric energy signal input from the signal input interface into an electric energy signal conforming to the USB-PD protocol.
Through the mode, the signal transmission device integrates the POE protocol architecture and the USB-PD protocol architecture, can avoid high-voltage alternating current input in a traditional power adapter supporting the USB-PD protocol, and further can avoid corresponding potential safety hazards, means that the signal transmission device is used for charging load equipment, can improve the safety of the charging process of the load equipment, and is particularly suitable for application scenes with high safety requirements. Moreover, the signal transmission device integrates the advantage that the POE protocol is suitable for long-distance power supply, and has the advantages of simple wiring and low cost.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. Moreover, the drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.
Fig. 1 is a schematic circuit diagram of a signal transmission device according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a second protocol circuit and a signal output interface according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of an embodiment of a protocol interaction circuit according to the invention;
FIG. 4 is a schematic diagram of an embodiment of a workflow of the signal transmission apparatus shown in FIG. 1;
FIG. 5 is a schematic circuit diagram of a first voltage conversion circuit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a second voltage converting circuit according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
The USB-PD protocol is a fast charging protocol established by USB-IF (USB Implementers Forum). The traditional power adapter supporting the USB-PD usually takes alternating current input as a main part, the output power of the traditional power adapter can reach 60W to 100W at most, and the traditional power adapter is used for charging consumer electronic products with quick charging interfaces, such as mobile phones, computers and the like. However, such an adapter has a high input voltage, is prone to have a potential safety hazard (especially for an application scenario with a high safety requirement), is not suitable for a scenario with long-distance power supply, and is complicated in wiring and high in cost when long-distance power supply is performed.
The POE protocol refers to a technology that, under the existing ethernet cat.5 wiring infrastructure, data signals are transmitted to terminals based on an IP, and meanwhile, direct current power supply can be provided for such devices. The POE protocol can ensure the normal operation of the existing network while ensuring the safety of the existing structured wiring, and the cost is reduced to the maximum extent. The POE protocol is the latest standard specification for simultaneously transferring data and electric power using the existing standard ethernet transmission cable, and maintains compatibility with the existing ethernet system and users. Moreover, the POE protocol can be suitable for long-distance power supply and has the advantages of simplicity in wiring and low cost.
In order to solve the technical problems of low safety of the load device in the charging process, complex wiring and high cost in long-distance power supply in the prior art, one embodiment of the invention provides a signal transmission device. The signal transmission device comprises a signal input interface, wherein the signal input interface is used for being connected with signal source equipment, and the signal input interface supports a POE protocol. The signal transmission device further comprises a first protocol circuit, the first protocol circuit supports a POE protocol, and the first protocol circuit is electrically connected with the signal input interface. The signal transmission device further comprises a second protocol circuit, the second protocol circuit supports the USB-PD protocol, and the second protocol circuit is electrically connected with the signal input interface and the first protocol circuit respectively and used for converting the electric energy signal input from the signal input interface into an electric energy signal conforming to the USB-PD protocol. The signal transmission device also comprises a signal output interface which is respectively and electrically connected with the signal input interface and the second protocol circuit and used for outputting the electric energy signal which accords with the USB-PD protocol to the load equipment. As described in detail below.
Referring to fig. 1, fig. 1 is a schematic circuit structure diagram of a signal transmission device according to an embodiment of the present invention.
In one embodiment, the signal transmission device is used for connecting the signal source equipment to transmit the signal input by the signal source equipment to the signal transmission device. The signal transmission device can also be connected with load equipment, and the signal source equipment can provide an electric energy signal so as to transmit the electric energy signal provided by the signal source equipment to the load equipment, thereby charging the load equipment. Of course, the signal source device may also provide a data signal, and the signal transmission apparatus transmits the data signal provided by the signal source device to the load device to implement interaction of the data signal.
The signal transmission device includes a signal input interface 10, where the signal input interface 10 is used to connect to a signal source device, and the signal input interface 10 supports a POE protocol. That is, 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), and of course the signal source device may also provide a data signal that needs to be interacted with.
Alternatively, the signal input interface 10 may be an RJ45 (Registered Jack 45) or the like, which mediates a power signal as well as a data signal into the signal transmission apparatus. RJ45 is a kind of information socket connector in a wiring system, and generally consists of a plug (or called a connector, a crystal plug) and a socket (or called a module), which belongs to the understanding domain of those skilled in the art and will not be described herein.
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 IEEE802.3 standard. Among them, the IEEE802.3 standard is a collection of Institute of Electrical and Electronics Engineers (IEEE) standards, which belong to the understanding of those skilled in the art and will not be described herein.
The signal transmission device further comprises a first protocol circuit 20, and the first protocol circuit 20 is electrically connected with the signal input interface 10. The first protocol circuit 20 supports a POE protocol, and is configured to complete protocol communication with a signal source device, and mainly includes detection, device classification, power supply control, power supply management, and the like. Alternatively, the first protocol circuit 20 may employ an integrated chip or the like.
Specifically, the first protocol circuit 20 can recognize whether the signal source device connected to the detection signal input interface 10 conforms to the standards of ieee802.3af, ieee802.3at, and ieee802.3bt, and can classify and indicate according to the power supply capability of the signal source device (which will be described in detail below). In addition, the first protocol circuit 20 can also perform power supply control and power supply management on the signal source device, for example, the first protocol circuit 20 can control the signal source device to start power supply; or when the first protocol circuit 20 recognizes that the output power of the signal transmission device is zero, the signal source equipment can be controlled to stop supplying power; or the first protocol circuit 20 may control the signal source device to stop supplying power when a short circuit occurs inside the signal transmission apparatus, so as to protect the circuit structure inside the signal transmission apparatus, and the like.
The signal transmission device further comprises a second protocol circuit 30, the second protocol circuit 30 being 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 is used to convert the power signal input from the signal input interface 10 into a power signal conforming to the USB-PD protocol through protocol communication between the first protocol circuit 20 and the second protocol circuit 30, so as to quickly charge the load device based on the USB-PD technology. Alternatively, the second protocol circuit 30 may employ an integrated chip or the like.
The signal transmission device further comprises a signal output interface 40, wherein the signal output interface 40 is respectively electrically connected with the signal input interface 10 and the second protocol circuit 30, and is used for outputting the converted electric energy signal conforming to the USB-PD protocol, so as to rapidly charge the load equipment connected with the signal output interface 40. The second protocol circuit 30 is capable of performing charging protocol negotiation and power management with the load device to which the signal output interface 40 is connected to supply a power signal required for charging the load device. 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 not a limitation to the specific circuit design of the second protocol circuit 30 and the signal output interface 40.
Of course, the signal output interface 40 may output the data signal input from the signal input interface 10.
Alternatively, the signal output interface 40 may be a USB Type-C or the like. 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 USB3.0 standard.
The signal transmission device integrates the framework of the POE protocol and the framework of the USB-PD protocol, can avoid the AC input with higher voltage in the traditional power adapter supporting the USB-PD protocol, and further can avoid corresponding potential safety hazards, which means that the signal transmission device is used for charging load equipment, can improve the safety of the charging process of the load equipment, and is particularly suitable for application scenes with higher safety requirements. Moreover, the signal transmission device integrates the advantage 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 can realize the interaction of power distribution among a plurality of load devices because the USB-PD protocol supports the handshake interaction mode, thereby realizing the simultaneous charging of the plurality of load devices by utilizing the framework of the USB-PD protocol on the basis of the POE protocol. The embodiment of the present invention is described by taking a single signal input interface 10 and a single signal output interface 40 as examples, which are only examples, and the situations of the multiple signal input interfaces 10 and the multiple signal output interfaces 40 can be obtained by the circuit structure topology shown in the embodiment of the present invention, and thus, the details are not repeated herein.
In an exemplary embodiment, the signal transmission device further includes a housing (not shown), and the above-mentioned 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 disposed in the housing, and the housing plays a role in carrying and protecting the circuit structures of the signal transmission device.
Please continue to refer to fig. 1. In an embodiment, the POE protocol is divided into a plurality of input power levels according to the power level of the signal source device, and the input power levels are used for measuring the power supply capability of the signal source device. For example, the input power classes may include Class3 (15W), class4 (25.5W), class5-6 (40W), and Class7-8 (71W), among others.
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 power class corresponding to the signal source device, and indicate the input power class corresponding to the signal source device. In particular, the first protocol circuit 20 is capable of identifying a target input power level, wherein the target input power level is an input power level of a signal source device to which the signal input interface 10 is currently connected. It will be appreciated that the signal source device to which signal input interface 10 is currently connected may differ, and that the target input power level may differ.
Referring to fig. 3, fig. 3 is a circuit structure diagram of a protocol interaction circuit according to an embodiment of the invention.
The signal transmission device further comprises a protocol interaction circuit 50, wherein the protocol interaction circuit 50 is electrically connected between the first protocol circuit 20 and the second protocol circuit 30 to interactively carry information of a target input power level through different states of the protocol interaction circuit 50, and the power of the electric energy signal output by the signal output interface 40 matches the target input power level.
That is, when the first protocol circuit 20 identifies the input power level of the signal source device to which the signal input interface 10 is currently connected, that is, the first protocol circuit 20 identifies the target input power level, the information about the target input power level can be interactively carried through different states of the protocol interaction circuit 50 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 so as to match the target input power level.
In this way, the protocol communication is performed between the first protocol circuit 20 and the second protocol circuit 30 through the protocol interaction circuit 50 to interactively carry the information of the target input power level, so that the electric energy signal conforming to the POE protocol can be converted into the electric energy signal conforming to the USB-PD protocol to be output, that is, the integration of the POE protocol architecture and the USB-PD protocol architecture is realized.
In an embodiment, the protocol interaction circuit 50 includes a plurality of first isolation circuits 51, each first isolation circuit 51 is electrically connected to the first protocol circuit 20 and the second protocol circuit 30, and the first isolation circuits 51 are configured to convert a level of a signal output by the first protocol circuit 20 into a corresponding level and transmit the level to the second protocol circuit 30.
In other words, the low level signal outputted by the first protocol circuit 20 can be converted into a corresponding low level signal or 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 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 the low level signal is converted by the first isolation circuit 51, a high level signal is formed and transmitted to the second protocol circuit 30, and the corresponding relationship between the low level signal output by the first protocol circuit 20 and the high level signal received by the second protocol circuit 30 is the level information of the signal interacted by the first isolation circuit 51.
The combination of the level information of the signals interacted with by each first isolation circuit 51 defines the state of the protocol interaction circuit 50. That is, the protocol interaction circuit 50 in different states includes different level information of signals interacted by at least some of the first isolation circuits 51 in each of the first isolation circuits 51, so as to describe different target input power levels through different states of the protocol interaction circuit 50.
In an embodiment, the first isolation circuit 51 employs 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 from being grounded, so as to avoid that the first voltage conversion circuit and the second voltage conversion circuit, which are described below, cannot work normally.
Specifically, the first isolation circuit 51 includes a light emitting diode 52 and a phototransistor 53. The led 52 has one end connected to the first protocol circuit 20 and the other end connected to ground. The first terminal 531 of the photo transistor 53 is connected to the second protocol circuit 30 and the power supply terminal 54, respectively, the second terminal 532 is grounded, and the control terminal 533 is disposed 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 terminal of the phototransistor 53 receives the light from the light emitting diode 52, the first terminal 531 and the second terminal 532 of the phototransistor 53 are turned on, and the second protocol circuit 30 receives a low level signal; when the first protocol circuit 20 outputs a low level signal, the light emitting diode 52 is not turned on, the first terminal 531 and the second terminal 532 of the phototransistor 53 are not turned on, and the second protocol circuit 30 receives a high level signal output from the power supply terminal.
It is 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 high level signal to the first isolation circuit 51 when the signal input interface 10 is connected to a signal source device. Of course, the signal transmission device may be additionally provided with a power supply to which the power supply terminal 54 is connected to supply a high level signal to the first isolation circuit 51.
Obviously, in other embodiments of the present invention, the first isolation circuit 51 may adopt other forms of isolation circuits, such as a magnetic coupling isolation circuit, and the like, which is not limited herein.
The signal input interface 10 and the second protocol circuit 30 are electrically connected by a second isolation circuit 55, and the combination of the level information of the signal transmitted by each first isolation circuit 51 and the level information of the signal transmitted by the second isolation circuit 55 defines the state of the protocol transmitting circuit 50. That is, the second isolation circuit 55 participates in defining the state of the protocol interaction circuit 50 in the present embodiment. The level information of the signal 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, except 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 a signal source device, the signal input interface 10 outputs a high level signal, and the second protocol circuit 30 receives a low level signal; when the signal input interface 10 does not access the signal source device, the signal input 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 signal interacted 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 a plurality of output power levels according to the power of the power signal that can be output by the signal output interface 40. The output power level characterizes the power supply capability of the signal output interface 40.
Optionally, the present embodiment may describe the output power level by using the voltage and the current of the power signal output by the signal output interface 40, for example, the output power level may include 5V/3A (15W), 9V/2A (18W), 12V/2A (24W), 15V/3A (45W), 20V/3A (60W), and the like, and conform to the USB-PD protocol.
Each input power class corresponds to a plurality of output power classes. The second protocol circuit 30 is configured to control the signal output interface 40 to broadcast the plurality of output power levels corresponding to the target input power level, that is, the signal output interface 40 broadcasts all output power levels corresponding to the target input power level, so as to indicate the power supply capability that the signal output interface 40 can provide. The second protocol circuit 30 interacts with the load device through the signal output interface 40 to determine an output power level of a matched load device in the output power levels broadcasted by the signal output interface 40, and the second protocol circuit 30 controls the signal output interface 40 to output an electric energy signal with corresponding power according to the output power level of the matched load device, that is, to output an electric energy signal with corresponding voltage and current. For example, 15V/3A of the output power level broadcast by the signal output interface 40 is required for charging the load device, so the signal output interface 40 outputs a power signal of 15V/3A to charge the load device.
The correspondence between the input power level and the output power level is shown in the following table (1):
the following describes a process of converting the power signal 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 electrically connected to each other through a first isolation circuit 51, and the channel CH4 and the channel CH8 are electrically connected to each other through a second isolation circuit 55.
As shown in the following table (2):
it can be seen that table (2) shows the level conditions of the electrical signals of the channels CH1 to CH8 when the first protocol circuit 20 and the second protocol circuit 30 interactively carry information of different input power levels, where "0" represents a low level signal and "1" represents a high level signal.
Referring to fig. 1, fig. 3 and fig. 4, fig. 4 is a schematic diagram of an embodiment of a working flow of the signal transmission apparatus shown in fig. 1.
S101: judging whether the signal input interface is accessed to signal source equipment or not;
in this embodiment, if the signal input interface 10 has access to the signal source device, step S102 is executed; if the signal input interface 10 does not access the signal source device, step S101 is continuously executed.
The first protocol circuit 20 is able to 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 outputs a high level signal, and the channel CH8 of the second protocol circuit 30 receives a low level signal; when the signal input interface 10 does not access the signal source device, the channel CH4 of the signal input interface 10 outputs a low level signal, and the channel CH8 of the second protocol circuit 30 receives a high level signal.
S102: the first protocol circuit determines a 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 further determines the input power level of the signal source device currently connected to the signal input interface 10, that is, determines the target input power level.
S103: the first protocol circuit and the second protocol circuit interactively carry information of target input power level;
in this embodiment, after the first protocol circuit 20 determines the target input power level, the first protocol circuit 20 needs to interactively carry information of the target input power level to the second protocol circuit 30, so that the second protocol circuit 30 can control the power of the electric energy signal output by the signal output interface 40 to match the target input power level, which requires that the second protocol circuit 30 can determine each output power level corresponding to the target input power level.
Based on the above-described tables (1) and (2), when the target input power level is Class7-8, the levels of the electric signals of the channel CH1, the channel CH2, and the channel CH3 of the first protocol circuit 20 are 0, and 0 in this order, and the levels of the electric signals of the channel CH5, the channel CH6, and the channel CH7 of the second protocol circuit 30 are 1, and 1 in this order. The second protocol circuit 30 knows that the output power of the current signal source device is 71W at the minimum, determines that the output power levels corresponding to the target input power levels are 20V/3A (60W), 15V/3A (45W), 12V/3A (36W), 9V/3A (27W) and 5V/3A (15W), and broadcasts through the signal output interface 40 to instruct the signal output interface 40 to provide power supplies of 20V/3A (60W), 15V/3A (45W), 12V/3A (36W), 9V/3A (27W) and 5V/3A (15W).
When the target input power level is Class5-6, the electrical signals of the channel CH1, the channel CH2, and the channel CH3 of the first protocol circuit 20 have levels of 0, 1, and 0 in this order, and the electrical signals of the channel CH5, the channel CH6, and the channel CH7 of the second protocol circuit 30 have levels of 1, 0, and 1 in this order. The second protocol circuit 30 knows that the output power of the current signal source device is 40W at the minimum, determines that the output power levels corresponding to the target input power levels are 20V/1A (20W), 15V/2A (30W), 12V/3A (36W), 9V/3A (27W) and 5V/3A (15W), and broadcasts through the signal output interface 40 to instruct the signal output interface 40 to provide power supplies of 20V/1A (20W), 15V/2A (30W), 12V/3A (36W), 9V/3A (27W) and 5V/3A (15W).
When the target input power level is Class4, the electrical signals of the channel CH1, the channel CH2, and the channel CH3 of the first protocol circuit 20 have levels of 1, 0, and 0 in this order, and the electrical signals of the channel CH5, the channel CH6, and the channel CH7 of the second protocol circuit 30 have levels of 0, 1, and 1 in this order. The second protocol circuit 30 knows that the output power of the current signal source device is minimum 25.5W, and therefore determines that the output power levels corresponding to the target input power level are 20V/1A (20W), 15V/1A (15W), 12V/2A (24W), 9V/2A (18W), and 5V/3A (15W), respectively, and broadcasts through the signal output interface 40, and instructs the signal output interface 40 to be capable of providing power supplies of (20W), 15V/1A (15W), 12V/2A (24W), 9V/2A (18W), and 5V/3A (15W).
When the target input power level is Class3, the electrical signals of the channel CH1, the channel CH2, and the channel CH3 of the first protocol circuit 20 have levels of 1, and 0 in this order, and the electrical signals of the channel CH5, the channel CH6, and the channel CH7 of the second protocol circuit 30 have levels of 0, and 1 in this order. The second protocol circuit 30 knows that the output power of the current signal source device is 15W at minimum, and therefore 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, indicating that the signal output interface 40 can provide 5V/2A (10W) power supply.
S104: the second protocol circuit controls the signal output interface to broadcast 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 controls the signal output interface 40 to output the electric energy signal with corresponding power according to the output power level of the matched load device, as described above.
Referring to fig. 1 and 5, fig. 5 is a schematic circuit diagram of a first voltage conversion circuit according to an embodiment of the present invention.
In an embodiment, the signal transmission apparatus further includes a first voltage conversion circuit 60, the first voltage conversion circuit 60 is electrically connected between the signal input interface 10 and the signal output interface 40, and is further electrically connected to the second protocol circuit 30, for converting the power signal input from the signal input interface 10 into a power signal conforming to the USB-PD protocol.
Specifically, after the information of the target input power level is interactively carried between the first protocol circuit 20 and the second protocol circuit 30, the second protocol circuit 30 determines the target output power level, the first voltage conversion circuit 60 takes the electric energy signal input from the signal input interface 10 as input, and the second protocol circuit 30 controls the first voltage conversion circuit 60 to output the electric energy signal of the voltage and the current corresponding to the target output power level.
Alternatively, the first voltage conversion circuit 60 may be a Buck circuit (i.e., a Buck converter circuit) or the like. The Buck circuit is a DC-DC (direct current to direct current) conversion circuit, which converts an input direct current voltage into a high frequency pulse through an oscillator circuit, and outputs a required direct current voltage through a pulse transformer and a rectification filter circuit, which belongs to the understanding range of those skilled in the art and will not be described herein again. The first voltage conversion circuit 60 may be a high duty cycle chip, which is not limited herein.
Further, referring to fig. 6, the signal transmission apparatus further includes a second voltage conversion circuit 70, wherein the second voltage conversion circuit 70 is electrically connected between the signal input interface 10 and the first voltage conversion circuit 60. That is, the first voltage conversion circuit 60 and the second voltage conversion circuit 70 participate in the conversion operation of the power signal together, and the two operate cooperatively, so that the signal transmission device of the present embodiment has higher efficiency and good reliability.
For example, after the signal input interface 10 is accessed by the signal source device, the first protocol circuit 20 determines the target input power level, and the second protocol circuit 30 determines the target output power level. Then, the signal input interface 10 inputs 40V-58V (e.g. 40V-58V/2A) dc, and the dc is converted into 21V-25V (e.g. 21V/3.5A) dc through the second voltage conversion circuit 70, and then the dc is converted into 5V-20V/3A Power signal through the first voltage conversion circuit 60, i.e. the Power signal is converted into a Power signal conforming to the USB-PD protocol, e.g. 5V/3A, 9V/2A, 12V/2A, 15V/3A, 20V/3A Power signal, and the PPS (Programmable Power Supply) protocol is supported, and finally the Power signal is output from the signal output interface 40.
Optionally, the second voltage converting circuit 70 may be an isolated DC-DC converting circuit, the second voltage converting circuit 70 employs a clamping active forward circuit, and the primary winding and the secondary winding of the transformer in the second voltage converting circuit 70 are isolated, so that the method has the advantages of high efficiency and small size of the transformer.
Please continue to refer to fig. 1. In one embodiment, the signal transmission device further comprises a rectifying circuit 80. The rectifying circuit 80 is electrically connected to the signal input interface 10, the signal output interface 40, and the first protocol circuit 20, respectively. The rectifying circuit 80 is used to rectify the power signal input from the signal input interface 10.
Alternatively, the rectifying circuit 80 may be a separate circuit or an integrated chip, and the like, to implement its rectifying function, which is not limited herein.
Please continue to refer to fig. 1. In one embodiment, the signal transmission apparatus 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, and specifically, the signal conversion circuit 90 and the first voltage conversion circuit 60 and the second voltage conversion circuit 70 are connected between the signal input interface 10 and the signal output interface 40 in parallel. The signal conversion circuit 90 is used for converting the data signal inputted 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 (Ethernet) data, and the data signal formed after conversion by the signal conversion circuit 90 conforms to the USB standard, such as the USB3.0 standard, and is output from the signal output interface 40. As for the specific principle of the signal conversion circuit 90 for implementing the data signal conversion, it belongs to the understanding scope of those skilled in the art, and will not be described herein.
In summary, the signal transmission device of the present invention integrates the architecture of the POE protocol and the architecture of the USB-PD protocol, and can avoid ac input with higher voltage in the conventional power adapter supporting the USB-PD protocol, thereby avoiding corresponding potential safety hazard, which means that the signal transmission device of the present invention is used for charging load equipment, and can improve the safety of the charging process of the load equipment, and is particularly suitable for application scenarios with higher safety requirements. Moreover, the signal transmission device integrates the advantage that the POE protocol is suitable for long-distance power supply, and has the advantages of simple wiring and low cost.
In addition, in the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected (electrically connected)", "stacked", and the like are to be construed broadly, and for example, may be fixedly connected, detachably connected, or integrated; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A signal transmission apparatus, comprising:
the signal input interface is used for connecting signal source equipment and supports a POE protocol;
the first protocol circuit supports a POE protocol and is electrically connected with the signal input interface;
the second protocol circuit is electrically connected with the signal input interface and the first protocol circuit respectively and used for converting the electric energy signal input by the signal input interface into an electric energy signal conforming to the USB-PD protocol;
and the signal output interface is respectively and electrically connected with the signal input interface and the second protocol circuit and is used for outputting the electric energy signal conforming to the USB-PD protocol to load equipment.
2. The signal transmission apparatus according to claim 1,
according to the power of the electric energy signal which can be provided by the signal source equipment, a plurality of input power grades are divided, the first protocol circuit can identify a target input power grade, and the target input power grade is the input power grade of the signal source equipment which is currently connected with the signal input interface;
the signal transmission device further comprises a protocol interaction circuit, wherein the protocol interaction circuit is electrically connected between the first protocol circuit and the second protocol circuit so as to carry information of the target input power level in an interaction mode through different states of the protocol interaction circuit, and the power of the electric energy signal output by the signal output interface is matched with the target input power level.
3. The signal transmission apparatus according to claim 2,
the protocol interaction circuit comprises a plurality of first isolation circuits, each first isolation circuit is electrically connected with the first protocol circuit and the second protocol circuit respectively, and the first isolation circuits are used for converting the level of signals output by the first protocol circuits into corresponding levels and transmitting the levels to the second protocol circuits;
the combination of the level information of the signals interacted by each first isolation circuit defines the state of the protocol interaction circuit.
4. The signal transmission device according to claim 3, wherein the first isolation circuit comprises a light emitting diode and a photo transistor, one end of the light emitting diode is connected to the first protocol circuit, the other end of the light emitting diode is grounded, a first end of the photo transistor is respectively connected to the second protocol circuit and the power supply terminal, a second end of the photo transistor is grounded, and a control terminal is arranged corresponding to the light emitting diode.
5. The signal transmission apparatus according to claim 3, wherein the signal input interface and the second protocol circuit are electrically connected through a second isolation circuit, and a combination of the level information of the signal interacted with by each of the first isolation circuits and the level information of the signal interacted with by the second isolation circuit defines a state of the protocol interaction circuit.
6. The signal transmission apparatus according to claim 2,
a plurality of output power grades are divided according to the power of the electric energy signal which can be output by the signal output interface, and each input power grade corresponds to a plurality of output power grades;
the second protocol circuit is used for controlling the signal output interface to broadcast the output power grades corresponding to the target input power grade, and controlling the signal output interface to output electric energy signals with corresponding power according to the output power grades of the matched load equipment.
7. The signal transmission device according to any one of claims 1 to 6, further comprising a first voltage conversion circuit electrically connected between the signal input interface and the signal output interface and electrically connected to the second protocol circuit for converting the power signal inputted from the signal input interface into a power signal conforming to a USB-PD protocol.
8. The signal transmission device according to claim 7, further comprising a second voltage conversion circuit electrically connected between the signal input interface and the first voltage conversion circuit.
9. The signal transmission device according to any one of claims 1 to 6, further comprising a rectifier circuit electrically connected to the signal input interface, the signal output interface, and the first protocol circuit, respectively.
10. The signal transmission device according to any one of claims 1 to 6, further comprising a signal conversion circuit electrically connected between the signal input interface and the signal output interface for converting a data signal input from the signal input interface into a data signal conforming to a protocol supported by the signal output interface.
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| CN202110343188.XA CN115150676A (en) | 2021-03-30 | 2021-03-30 | Signal transmission device |
| PCT/CN2022/083431 WO2022206691A1 (en) | 2021-03-30 | 2022-03-28 | Signal transmission apparatus |
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| CN202110343188.XA CN115150676A (en) | 2021-03-30 | 2021-03-30 | Signal transmission device |
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