Single-wire Isolated Communication Device, System and Control Method

Abstract

This application relates to a single-wire isolation communication device, system and control method. The device includes: a communication circuit, a transmission splitter, and an isolation impedance element. Among them, the communication circuit is connected to the transmission bus through the transmission splitter, and the isolation impedance element is arranged on the transmission bus. The transmission splitter is used for transmitting communication signals between the communication circuit and the transmission bus, and the isolation impedance element is used to limit the high-frequency signals sent from the transmission splitter to the transmission bus between the transmission splitters communicating with each other, and allow the low-frequency communication signals and / or power supply on the original transmission bus to continue to be transmitted. The communication circuit includes: a sending circuit, a receiving circuit, and a state controller, and the state controller is respectively connected to the sending circuit and the receiving circuit. In this application, by setting the isolation impedance element, the power supply and communication signals can be transmitted inside the single-wire isolation communication device at the same time without the need for switch switching.

Description

Technical Field

[0001] This application relates to the technical field of electronic device communication, and particularly to a single-wire isolation communication device, system and control method. Background Art

[0002] Isolation communication is divided into transformer isolation communication, optical isolation communication, capacitive isolation communication, etc. Traditional capacitive isolation communication cannot be transmitted on the power line through carrier modulation. A differential structure is adopted, that is, at least two signal lines are used to realize the transmission of one signal. In many electronic devices, there is often only one power line as an interface. It is difficult for the electronic devices at both ends of the connection line to communicate. For example, in TWS earphones, the earphone and the earphone case are connected through a power contact, and the earphone needs to communicate with the earphone case to exchange information or achieve control. The contact between the earphone and the earphone case has two contacts (one power contact and one ground contact). In the prior art, most of them use electronic switches (such as MOS transistors) to switch and multiplex the power contact connection signals. When power transmission is required, the contact is connected to the power line through an internal switch. When communication signal transmission is required, the contact is connected to the internal communication signal circuit through an internal switch. Therefore, power and communication signals cannot be transmitted simultaneously. Summary of the Invention

[0003] To overcome at least to some extent the problem that power and signals cannot be transmitted simultaneously between electronic devices in the related art, this application provides a single-wire isolation communication device, system and control method.

[0004] The solution of this application is as follows:

[0005] According to the first aspect of the embodiments of this application, a single-wire isolation communication device is provided, including:

[0006] A communication circuit, a transmission branch line, and an isolation impedance element;

[0007] The communication circuit accesses a transmission bus through the transmission branch line;

[0008] The isolation impedance element is arranged on the transmission bus inside the single-wire isolation communication device;

[0009] The transmission branch line is used for transmitting communication signals between the communication circuit and the transmission bus; the isolation impedance element is used to limit the high-frequency signals sent from the transmission branch line to the transmission bus between the transmission branch lines that communicate with each other, and allow the low-frequency communication signals and / or power on the original transmission bus to continue to be transmitted;

[0010] The communication circuit includes: a sending circuit, a receiving circuit, and a state controller;

[0011] The state controller is respectively connected to the sending circuit and the receiving circuit;

[0012] The sending circuit is used to send the communication signal to the transmission bus through the transmission splitter;

[0013] The receiving circuit is used to receive the communication signal sent by the transmission bus through the transmission splitter;

[0014] The state controller is used to cut off the receiving circuit when detecting that the sending circuit sends the communication signal; and cut off the sending circuit when detecting that the receiving circuit receives the communication signal.

[0015] Preferably, in an implementable manner of the present application, the single-wire isolation communication device further includes: a coupling capacitor;

[0016] The coupling capacitor is arranged on the transmission splitter;

[0017] The sending circuit sends the communication signal to the transmission bus through the transmission splitter and the coupling capacitor;

[0018] The receiving circuit receives the communication signal sent by the transmission bus through the transmission splitter and the coupling capacitor.

[0019] Preferably, in an implementable manner of the present application, the sending circuit includes:

[0020] A first input port, a second input port, a logic circuit, a P-channel field effect transistor, an N-channel field effect transistor, and a first output port;

[0021] The logic circuit is respectively connected to the first input port, the second input port, the P-channel field effect transistor, and the N-channel field effect transistor;

[0022] The P-channel field effect transistor and the N-channel field effect transistor are also connected to the first output port;

[0023] The first input port is used to input a first enable signal;

[0024] The second input port is used to input the communication signal;

[0025] The first output port is used to output the communication signal to the transmission bus through the transmission splitter.

[0026] Preferably, in an implementable manner of the present application, the receiving circuit includes:

[0027] A third input port, a fourth input port, a high-level comparator, a low-level comparator, a high-threshold comparison voltage input port, a low-threshold comparison voltage input port, a latch, a common-mode voltage generation circuit, and a second output port;

[0028] The third input port is respectively connected to the high-level comparator and the low-level comparator;

[0029] The fourth input port is respectively connected to the high-level comparator, the low-level comparator, and the common-mode voltage generation circuit;

[0030] The high-threshold comparison voltage input port is connected to the high-level comparator;

[0031] The low-threshold comparison voltage input port is connected to the low-level comparator;

[0032] The high-level comparator and the low-level comparator are also connected to the latch;

[0033] The latch is also connected to the second output port;

[0034] The third input port is used to input a second enable signal;

[0035] The high-threshold comparison voltage input port is used to provide a high-threshold comparison voltage to the high-level comparator;

[0036] The low-threshold comparison voltage input port is used to provide a low-threshold comparison voltage to the low-level comparator;

[0037] The common-mode voltage generation circuit is used to provide a common-mode voltage to the fourth input port;

[0038] The fourth input port is used to receive the communication signal sent by the transmission bus through the transmission branch line and send it to the high-level comparator and the low-level comparator;

[0039] The high-level comparator and the low-level comparator are used to compare the communication signal with the high-threshold comparison voltage and the low-threshold comparison voltage, and output the comparison result through the latch and the second output port.

[0040] Preferably, in an implementable manner of the present application, the state controller is respectively connected to the input end of the sending circuit, the enable end of the sending circuit, the output end of the receiving circuit, and the enable end of the receiving circuit.

[0041] Preferably, in an implementable manner of the present application, the state controller includes:

[0042] A receive wait timeout counter and a transmit wait timeout counter.

[0043] Preferably, in an implementable manner of the present application, the isolation impedance element is an inductor, or a magnetic bead, or a coil printed on a PCB board.

[0044] According to a second aspect of the embodiments of the present application, a single-wire isolation communication system is provided, including:

[0045] A transmission bus and a plurality of single-wire isolation communication devices as described in any one of the above;

[0046] The transmission bus is respectively connected to each of the single-wire isolation communication devices, and is used for performing communication signal transmission and / or power transmission with the single-wire isolation communication devices.

[0047] According to a third aspect of the embodiments of the present application, a single-wire isolation communication control method is provided, including:

[0048] Detect whether the transmission bus is in an idle state in the current cycle;

[0049] When the transmission bus is in an idle state, enable the receiving circuit to 1 and disable the sending circuit to 0;

[0050] When currently sending / receiving communication signals, maintain the current communication state and prohibit receiving / sending communication signals;

[0051] When the sending or receiving waiting time reaches a preset sending or receiving waiting duration, end the current communication state and enter the next cycle.

[0052] Preferably, in an implementable manner of the present application, the step of when currently sending / receiving communication signals, maintaining the current communication state and prohibiting receiving / sending communication signals includes:

[0053] When the receiving circuit is receiving communication signals, disable the sending circuit to 0 and enable the receiving circuit to 1;

[0054] Reset the receive wait counter and maintain the enable of the receiving circuit when the receive wait counter is counting;

[0055] When the receiving circuit is not receiving communication signals and the sending circuit is sending communication signals, enable the sending circuit to 1 and disable the receiving circuit to 0; reset the transmit wait counter and maintain the enable of the sending circuit when the transmit wait counter is counting.

[0056] The technical solutions provided by this application may include the following beneficial effects: The single-wire isolation communication device in this application includes: a communication circuit, a transmission splitter, and an isolation impedance element. Among them, the communication circuit is connected to the transmission bus through the transmission splitter, and the isolation impedance element is arranged on the transmission bus inside the single-wire isolation communication device. The transmission splitter is used for transmitting communication signals between the communication circuit and the transmission bus, and the isolation impedance element is used to limit the high-frequency communication signals sent from the transmission splitter to the transmission bus between the transmission splitters communicating with each other, and allow the low-frequency communication signals and / or power supply on the original transmission bus to continue to be transmitted. The communication circuit includes: a sending circuit, a receiving circuit, and a state controller, and the state controller is respectively connected to the sending circuit and the receiving circuit. The sending circuit is used for sending communication signals to the transmission bus through the transmission splitter, the receiving circuit is used for receiving communication signals sent by the transmission bus through the transmission splitter, and the state controller is used for cutting off the receiving circuit when detecting that the sending circuit sends communication signals; and cutting off the sending circuit when detecting that the receiving circuit receives communication signals. In this application, by setting the isolation impedance element, the power supply and communication signals can be transmitted simultaneously inside the single-wire isolation communication device without the need for switch switching.

[0057] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. Brief Description of the Drawings

[0058] The drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0059] Figure 1 It is a schematic structural diagram of a single-wire isolation communication device provided by an embodiment of this application;

[0060] Figure 2 It is a schematic circuit diagram of the communication circuit in a single-wire isolation communication device provided by an embodiment of this application;

[0061] Figure 3 It is a schematic circuit diagram of the sending circuit in a single-wire isolation communication device provided by an embodiment of this application;

[0062] Figure 4 It is a schematic circuit diagram of the receiving circuit in a single-wire isolation communication device provided by an embodiment of this application;

[0063] Figure 5 It is a schematic circuit diagram of the common-mode voltage generation circuit in a single-wire isolation communication device provided by an embodiment of this application;

[0064] Figure 6It is a waveform diagram of the main nodes of the receiving circuit in a single-wire isolated communication device provided by an embodiment of the present application;

[0065] Figure 7 It is the signal waveforms of the transmitting circuit, receiving circuit, and transmission branch line in a single-wire isolated communication device provided by an embodiment of the present application;

[0066] Figure 8 It is a schematic structural diagram of a single-wire isolated communication device provided by another embodiment of the present application;

[0067] Figure 9 It is a schematic flow diagram of a single-wire isolated communication control method provided by an embodiment of the present application.

[0068] Reference numerals: communication circuit - 1; transmitting circuit - 11; first input port - 111; second input port - 112; logic circuit - 113; P field-effect transistor - 114; N field-effect transistor - 115; first output port - 116; receiving circuit - 12; third input port - 121; fourth input port - 122; high-level comparator - 123; low-level comparator - 124; high-threshold comparison voltage input port - 125; low-threshold comparison voltage input port - 126; latch - 127; common-mode voltage generation circuit - 128; second output port - 129; state controller - 13; transmission branch line - 2; transmission bus - 3; isolation impedance element - 4; coupling capacitor - 5. Detailed Description of the Embodiment

[0069] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of the device and control method consistent with some aspects of the present application as detailed in the appended claims.

[0070] A single-wire isolated communication device, referring to Figure 1 , includes:

[0071] A communication circuit 1, a transmission branch line 2, and an isolation impedance element 4;

[0072] The communication circuit 1 is connected to the transmission bus 3 through the transmission branch line 2;

[0073] The isolation impedance element 4 is disposed on the transmission bus 3 inside the single-wire isolated communication device;

[0074] The transmission branch line 2 is used for transmitting communication signals between the communication circuit 1 and the transmission bus 3;

[0075] The communication circuit 1 includes: a transmitting circuit 11, a receiving circuit 12, and a status controller 13;

[0076] The status controller 13 is respectively connected to the transmitting circuit 11 and the receiving circuit 12;

[0077] The transmitting circuit 11 is used to send communication signals to the transmission bus 3 through the transmission branch line 2;

[0078] The receiving circuit 12 is used to receive communication signals sent by the transmission bus 3 through the transmission branch line 2;

[0079] The status controller 13 is used to cut off the receiving circuit 12 when detecting that the transmitting circuit 11 sends a communication signal; and cut off the transmitting circuit 11 when detecting that the receiving circuit 12 receives a communication signal.

[0080] As Figure 1 shown, the transmission branch line is the transmission line in the Y-axis direction of the single-wire isolation communication device, and the transmission bus is the transmission line in the X-axis direction of the single-wire isolation communication device. The solution in this embodiment is applied to the communication between one-to-one, one-to-many, or many-to-many electronic devices. Therefore, there can be multiple single-wire isolation communication devices, and each single-wire isolation communication device is connected to the transmission bus 3.

[0081] In this embodiment, by setting an isolation impedance element 4 on the transmission bus 3 connected to the inside of the single-wire isolation communication device, the isolation impedance element 4 is used to limit the high-frequency communication signals sent from the transmission branch line to the transmission bus between the transmission branch lines for mutual communication, and allow the low-frequency communication signals and / or power supply on the original transmission bus to continue to be transmitted. The isolation impedance element 4 enables the power supply and communication signals to be transmitted simultaneously inside the single-wire isolation communication device without the need for switch conversion.

[0082] In this embodiment, the isolation impedance element 4 can be set inside the single-wire isolation communication device, or can be set on the outside of the single-wire isolation communication device by attachment.

[0083] The isolation impedance element 4 can be, but is not limited to, an inductor or a magnetic bead.

[0084] The isolation impedance element can also be a coil printed on the PCB board inside the single-wire isolation communication device. This design is more cost-saving compared to directly using an inductor or a magnetic bead.

[0085] Referring to Figure 2 , the communication circuit 1 includes: a transmitting circuit 11, a receiving circuit 12, and a status controller 13.

[0086] Preferably, the status controller 13 is respectively connected to the input end of the transmitting circuit 11, the enable end of the transmitting circuit 11, the output end of the receiving circuit 12, and the enable end of the receiving circuit 12.

[0087] Specifically, referring to Figure 3 , the sending circuit 11 includes:

[0088] a first input port 111, a second input port 112, a logic circuit 113, a P-channel field-effect transistor 114, an N-channel field-effect transistor 115, and a first output port 116;

[0089] The logic circuit 113 is respectively connected to the first input port 111, the second input port 112, the P-channel field-effect transistor 114, and the N-channel field-effect transistor 115;

[0090] The P-channel field-effect transistor 114 and the N-channel field-effect transistor 115 are also connected to the first output port 116;

[0091] Optionally, the logic circuit 113 in this embodiment includes: a first inverter, a second inverter, an OR gate, and an AND gate;

[0092] Specifically, the first input port 111 is respectively connected to the first inverter and the AND gate;

[0093] The second input port 112 is connected to the second inverter;

[0094] The first inverter is also connected to the OR gate;

[0095] The second inverter is also connected to the OR gate and the AND gate;

[0096] The OR gate is also connected to the P-channel field-effect transistor 114;

[0097] The AND gate is also connected to the N-channel field-effect transistor 115.

[0098] During implementation, the first input port 111 is used to input a first enable signal;

[0099] The second input port 112 is used to input a communication signal;

[0100] The first output port 116 is used to output a communication signal to the transmission bus 3 through the transmission splitter 2;

[0101] Specifically, when the input of the first input port 111 is 0, the P-channel field-effect transistor 114 and the N-channel field-effect transistor 115 are turned off, and the voltage output port presents a high impedance state; when the input of the first input port 111 is 1, if the input of the second input port 112 is also 1, the P-channel field-effect transistor 114 is turned on, the N-channel field-effect transistor 115 is turned off, and the voltage output port outputs 1; when the input of the first input port is 1, if the input of the second input port 112 is 0, the P-channel field-effect transistor 114 is turned off, the N-channel field-effect transistor 115 is turned on, and the voltage output port outputs 0.

[0102] In the transmission circuit 11, there is a transmission enable signal EN_TX, an input communication signal TX, and an output signal AC, which respectively correspond to the first input port 111, the second input port 112, and the first output port 116.

[0103] Referring to Figure 4 , the receiving circuit 12 includes:

[0104] A third input port 121, a fourth input port 122, a high-level comparator 123, a low-level comparator 124, a high-threshold comparison voltage input port 125, a low-threshold comparison voltage input port 126, a latch 127, a common-mode voltage generation circuit 128, and a second output port 129;

[0105] The third input port 121 is respectively connected to the high-level comparator 123 and the low-level comparator 124;

[0106] The fourth input port 122 is respectively connected to the high-level comparator 123, the low-level comparator 124, and the common-mode voltage generation circuit 128;

[0107] The high-threshold comparison voltage input port 125 is connected to the high-level comparator 123;

[0108] The low-threshold comparison voltage input port 126 is connected to the low-level comparator 124;

[0109] The high-level comparator 123 and the low-level comparator 124 are also connected to the latch 127;

[0110] The latch 127 is also connected to the second output port 129;

[0111] The third input port 121 is used to input the second enable signal;

[0112] The high-threshold comparison voltage input port 125 is used to provide a high-threshold comparison voltage to the high-level comparator 123;

[0113] The low-threshold comparison voltage input port 126 is used to provide a low-threshold comparison voltage to the low-level comparator 124;

[0114] The common-mode voltage generation circuit 128 is used to provide a common-mode voltage to the fourth input port 122;

[0115] The fourth input port 122 is used to receive the communication signal sent by the transmission bus 3 through the transmission splitter 2 and send it to the high-level comparator 123 and the low-level comparator 124;

[0116] The high-level comparator 123 and the low-level comparator 124 are used to compare the communication signal with the high-threshold comparison voltage and the low-threshold comparison voltage, and output the comparison result through the latch 127 and the second output port 129.

[0117] Circuit diagram of the common-mode voltage generation circuit 128 is referred to Figure 5 .

[0118] As Figure 4 shown, VREFH is the high threshold comparison voltage of AC, VREFL is the low threshold comparison voltage of AC, COMPH and COMPL are the outputs of the comparator. The common-mode voltage generation circuit 128 generates a common-mode voltage for AC. When AC does not send and receive signals, or the transmission bus 3 is idle, AC stabilizes at the preset common-mode voltage. EN_RX is used to enable the receiving circuit 12. The waveforms of the main nodes are as Figure 6 shown.

[0119] The state controller 13 includes:

[0120] A receive wait timeout counter and a transmit wait timeout counter;

[0121] The state controller 13 is used to control the third input port 121 to input 1 and the first input port 111 to input 0 when it detects that the fourth input port 122 receives a communication signal, and control the receive wait timeout counter to be reset and count; when it detects that the second input port 112 sends a communication signal, control the first input port 111 to input 1, the third input port 121 to input 0, and control the transmit wait timeout counter to be reset and count.

[0122] In this embodiment, the control logic of the state controller 13 is that when the bus is idle, the third input port 121 is 1 and the first input port 111 inputs 0. When it detects that the receiving circuit 12 receives a communication signal, it cuts off the transmitting circuit 11. The operation process is to control the third input port 121 to input 1, the first input port 111 to input 0, and control the receive wait timeout counter to be reset, and keep the third input port 121 input 1 during the counting process of the receive wait timeout counter, continuously enabling. When the receive wait timeout counter counts to the preset time, the reception ends. When it detects that the transmitting circuit 11 sends a communication signal, it cuts off the receiving circuit 12. The operation process is to control the first input port 111 to input 1, the third input port 121 to input 0, and control the transmit wait timeout counter to be reset, and keep the first input port 111 input 1 during the counting process of the transmit wait timeout counter, continuously enabling. When the transmit wait timeout counter counts to the preset time, the transmission ends, the first input port 111 is 0, and the third input port 121 is 1.

[0123] Figure 7It is the signal waveforms of the sending circuit 11, the receiving circuit 12, and the transmission bus 3. The rising edge or falling edge of the sending signal of the sending circuit 11 couples an upward pulse signal or a downward pulse signal on the transmission bus 3 through the coupling capacitor 5 on the sending side. This signal on the transmission bus 3 couples these pulses to the receiving circuit 12 on the receiving side through the coupling capacitor 5 of the transmission branch line 2 on the receiving side. The receiving circuit 12 on the receiving side demodulates the received signal and finally restores the sending data on the sending side.

[0124] The single-wire isolation communication device in this embodiment includes: a communication circuit 1, a transmission branch line 2, and an isolation impedance element 4. Among them, the communication circuit 1 is connected to the transmission bus 3 through the transmission branch line 2, and the isolation impedance element 4 is arranged on the transmission bus 3. The transmission branch line 2 is used for transmitting communication signals between the communication circuit 1 and the transmission bus 3. The isolation impedance element 4 is used to limit the high-frequency signals sent from the transmission branch line 2 to the transmission bus 3 between the transmission branch lines 2 that communicate with each other and allow the low-frequency communication signals and / or power supply on the original transmission bus 3 to continue to be transmitted. The communication circuit 1 includes: a sending circuit 11, a receiving circuit 12, and a state controller 13, and the state controller 13 is respectively connected to the sending circuit 11 and the receiving circuit 12. In this application, by setting the isolation impedance element 4, the power supply and communication signals can be transmitted inside the single-wire isolation communication device at the same time without the need for switch switching.

[0125] In some embodiments of the single-wire isolation communication device, referring to Figure 8 , the single-wire isolation communication device further includes: a coupling capacitor 5;

[0126] The coupling capacitor 5 is arranged on the transmission branch line 2;

[0127] The sending circuit 11 sends communication signals to the transmission bus 3 through the transmission branch line 2 and the coupling capacitor 5;

[0128] The receiving circuit 12 receives the communication signals sent by the transmission bus 3 through the transmission branch line 2 and the coupling capacitor 5.

[0129] In the prior art, when two electronic devices send signals at the same time, there will be risks such as short-circuiting on both sides and burning out of the communication circuit. In this embodiment, by setting the coupling capacitor 5 on the transmission branch line 2, the risk of burning out the communication circuit is avoided.

[0130] In this embodiment, the communication signals of the communication circuit 1 are coupled to the transmission branch line 2 through the coupling capacitor 5, or the communication signals on the transmission branch line 2 are coupled to the communication circuit 1.

[0131] A single-wire isolation communication system, referring to Figure 1 or Figure 8 , includes:

[0132] A transmission bus 3 and a plurality of single - wire isolation communication devices as in any of the above embodiments;

[0133] The transmission bus 3 is respectively connected to each single - wire isolation communication device, and is used for power transmission and communication signal transmission with the single - wire isolation communication device.

[0134] Such as Figure 1 Or Figure 8 As shown, the transmission branch line is the transmission line in the Y - axis direction in the single - wire isolation communication device, and the transmission bus is the transmission line in the X - axis direction in the single - wire isolation communication device. The single - wire isolation communication system in this embodiment is applied to communication between one - to - many or many - to - many electronic devices. There can be multiple single - wire isolation communication devices, and each single - wire isolation communication device is connected to the transmission bus 3.

[0135] The single - wire isolation communication system in this embodiment includes a plurality of single - wire isolation communication devices. The single - wire isolation communication device includes: a communication circuit, a transmission branch line, and an isolation impedance element. Among them, the communication circuit is connected to the transmission bus through the transmission branch line, and the isolation impedance element is arranged on the transmission bus inside the single - wire isolation communication device. The transmission branch line is used for communication signal transmission between the communication circuit and the transmission bus. A coupling capacitor is arranged on the transmission branch line. The isolation impedance element is used to limit the high - frequency communication signal sent from the transmission branch line to the transmission bus between the mutually communicating transmission branch lines, and allow the low - frequency communication signal and / or power on the original transmission bus to continue to be transmitted. The communication circuit includes: a sending circuit, a receiving circuit, and a state controller. The state controller is respectively connected to the sending circuit and the receiving circuit. In this application, by setting the isolation impedance element and the coupling capacitor on the transmission branch line, the power and communication signals can be transmitted simultaneously inside the single - wire isolation communication device without the need for switch switching.

[0136] A single - wire isolation communication control method, referring to Figure 9 , includes:

[0137] S11: Detect whether the transmission bus is in an idle state in the current cycle;

[0138] S12: When the transmission bus is in an idle state, enable the receiving circuit to 1 and disable the sending circuit to 0;

[0139] S13: When currently sending / receiving communication signals, maintain the current communication state and prohibit receiving / sending communication signals;

[0140] S14: When the sending or receiving waiting time reaches the preset sending or receiving waiting duration, end the current communication state and enter the next cycle.

[0141] When currently sending / receiving communication signals, maintaining the current communication state and prohibiting receiving / sending communication signals specifically includes:

[0142] When the receiving circuit receives a communication signal, set the enable of the transmitting circuit to 0 and the enable of the receiving circuit to 1; reset the receive wait counter and keep the receive circuit enabled while the receive wait counter is counting.

[0143] When the receiving circuit is not receiving a communication signal and the transmitting circuit is transmitting a communication signal, set the enable of the transmitting circuit to 1 and the enable of the receiving circuit to 0; reset the transmit wait counter and keep the transmitting circuit enabled while the transmit wait counter is counting.

[0144] The single-wire isolation communication control method in this embodiment includes: detecting whether the transmission bus is in an idle state in the current cycle. When the transmission bus is in an idle state, detecting whether a transmit / receive communication signal is currently being performed. When a transmit / receive communication signal is currently being performed, maintain the current communication state and prohibit the receive / transmit communication signal. When the transmit or receive wait time reaches the preset transmit or receive wait duration, end the current communication state and enter the next cycle. In this embodiment, during the communication process between the current electronic device and other electronic devices, signal reception is prohibited when transmitting a communication signal, and signal transmission is prohibited when receiving a communication signal, preventing transceiver chaos.

[0145] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not detailed in some embodiments can be seen in the same or similar content of other embodiments.

[0146] It should be noted that in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "a plurality" refers to at least two.

[0147] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0148] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A single-line isolation communication device, characterized in that, Comprising: A communication circuit, a transmission distribution line, and an isolation impedance element; The communication circuit accesses a transmission bus through the transmission distribution line; The isolation impedance element is disposed on the transmission bus; The isolation impedance element is used to limit the high-frequency communication signals sent from the transmission distribution line to the transmission bus between the transmission distribution lines communicating with each other, and allow the low-frequency communication signals and / or power supply on the original transmission bus to continue to be transmitted; The transmission distribution line is used for transmitting communication signals between the communication circuit and the transmission bus; The communication circuit includes: a sending circuit, a receiving circuit, and a status controller; The status controller is respectively connected to the sending circuit and the receiving circuit; The sending circuit is used to send the communication signal to the transmission bus through the transmission distribution line; The receiving circuit is used to receive the communication signal sent by the transmission bus through the transmission distribution line; The status controller is used to cut off the receiving circuit when detecting that the sending circuit sends the communication signal; and cut off the sending circuit when detecting that the receiving circuit receives the communication signal.

2. The single-line isolation communication device according to claim 1, wherein The single-wire isolation communication device further includes: a coupling capacitor; The coupling capacitor is disposed on the transmission distribution line; The sending circuit sends the communication signal to the transmission bus through the transmission distribution line and the coupling capacitor; The receiving circuit receives the communication signal sent by the transmission bus through the transmission distribution line and the coupling capacitor.

3. The single-line isolation communication device according to claim 1, characterized in that The sending circuit includes: A first input port, a second input port, a logic circuit, a P-channel field effect transistor, an N-channel field effect transistor, and a first output port; The logic circuit is respectively connected to the first input port, the second input port, the P-channel field effect transistor, and the N-channel field effect transistor; The P-channel field effect transistor and the N-channel field effect transistor are further connected to the first output port; The first input port is used to input a first enable signal; The second input port is used to input the communication signal; The first output port is used to output the communication signal to the transmission bus through the transmission distribution line.

4. The single-wire isolation communication device according to claim 1, characterized in that, The receiving circuit includes: A third input port, a fourth input port, a high-level comparator, a low-level comparator, a high threshold comparison voltage input port, a low threshold comparison voltage input port, a latch, a common-mode voltage generation circuit, and a second output port; The third input port is respectively connected to the high-level comparator and the low-level comparator; The fourth input port is respectively connected to the high-level comparator, the low-level comparator, and the common-mode voltage generation circuit; The high threshold comparison voltage input port is connected to the high-level comparator; The low threshold comparison voltage input port is connected to the low-level comparator; The high-level comparator and the low-level comparator are further connected to the latch; The latch is further connected to the second output port; The third input port is used to input a second enable signal; The high threshold comparison voltage input port is used to provide a high threshold comparison voltage to the high-level comparator; The low threshold comparison voltage input port is used to provide a low threshold comparison voltage to the low-level comparator; The common-mode voltage generation circuit is used to provide a common-mode voltage to the fourth input port; The fourth input port is used to receive the communication signal sent by the transmission bus through the transmission branch line and send it to the high-level comparator and the low-level comparator; The high-level comparator and the low-level comparator are used to compare the communication signal with the high threshold comparison voltage and the low threshold comparison voltage, and output the comparison result through the latch and the second output port.

5. The single-wire isolation communication device according to claim 1, wherein The state controller is respectively connected to the input end of the sending circuit, the enabling end of the sending circuit, the output end of the receiving circuit, and the enabling end of the receiving circuit.

6. The single-wire isolation communication device according to claim 5, characterized in that, The state controller includes: A receive wait timeout counter and a transmit wait timeout counter.

7. The single-wire isolation communication device according to claim 1, wherein the isolation impedance element is an inductor, or a magnetic bead, or a coil printed on a PCB board.

8. A single-wire isolation communication system, characterized in that, Comprising: A transmission bus and a plurality of single-wire isolation communication devices as described in any one of claims 1-7; The transmission bus is respectively connected to each of the single-wire isolation communication devices for communicating communication signals and / or power with the single-wire isolation communication devices.

9. A single-line isolation communication control method is applied to the single-line isolation communication device according to any one of claims 1-7, characterized in that, Comprising: Detect whether the transmission bus is in an idle state in the current cycle; When the transmission bus is in an idle state, enable the receiving circuit to 1 and disable the sending circuit to 0; When currently sending / receiving communication signals, maintain the current communication state and prohibit receiving / sending communication signals; When the send or receive wait time reaches the preset send or receive wait duration, end the current communication state and enter the next cycle.

10. The control method according to claim 9, wherein, The step of, when currently sending / receiving communication signals, maintaining the current communication state and prohibiting receiving / sending communication signals includes: When the receiving circuit is receiving a communication signal, disable the sending circuit to 0 and enable the receiving circuit to 1; reset the receive wait counter and maintain the enable of the receiving circuit when the receive wait counter is counting; When the receiving circuit is not receiving a communication signal and the sending circuit is sending a communication signal, enable the sending circuit to 1 and disable the receiving circuit to 0; reset the transmit wait counter and maintain the enable of the sending circuit when the transmit wait counter is counting.

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