Transmitting circuit and communication system
By introducing flip circuit and boost circuit into the TTL bus communication circuit, the problems of high power consumption and poor anti-interference ability of the TTL bus communication circuit are solved, further transmission of signals and higher reliability are achieved, and design difficulty is reduced. cost.
Patent Information
- Application Number
- CN202420242530.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-31
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-01-31
AI Technical Summary
The TTL bus communication circuit has high power consumption and low communication voltage, resulting in poor anti-interference ability. In the prior art, the design is difficult and costly.
Design a transmission circuit, including a flip circuit and a boost circuit, which flips the control signal of the host and outputs it. The boost circuit boosts the signal and transmits it through the bus, thereby improving the anti-interference ability and reliability, and without control. Keep the circuit off state while signaling to reduce power consumption.
It improves the anti-interference capability and signal transmission distance of the communication bus, reduces overall power consumption and communication costs, and enhances signal reliability and transmission capabilities.
Smart Images
Figure CN222147637U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bus communication, in particular to a sending circuit and a communication system. Background Art
[0002] Bus communication refers to the communication system in which different devices communicate through a shared data bus. Currently, the most commonly used communication method between smart energy meters is the 485 bus communication method. When using the 485 bus communication, each smart meter hardware circuit must be equipped with a 485 chip and supporting peripheral circuits, which is relatively expensive and increases the difficulty of drawing the printed circuit board (PCB). In addition, the power consumption of the overall circuit during the communication process of the 485 bus is relatively large. In the related art, the use of the TTL communication bus method can significantly reduce the overall device cost and design difficulty, but compared with the original 485 communication bus circuit, the TTL communication bus has poor anti-interference ability and low reliability. Utility Model Content
[0003] Therefore, the technical problem to be solved by the present invention is to solve the problem in the prior art that the TTL bus communication circuit has high power consumption and low communication voltage resulting in poor anti-interference ability, thereby providing a sending circuit and a communication system.
[0004] In order to achieve the above object, the utility model provides the following technical solutions:
[0005] In the first aspect, the utility model provides a sending circuit, which is used to realize signal transmission from a host to a slave, and the sending circuit includes: a flip circuit and a boost circuit, wherein the flip circuit has an input end connected to the host, and an output end connected to the input end of the boost circuit, and is used to flip a first control signal sent by the host and then output a second control signal, and the first control signal indicates that the host needs to control the slave; the boost circuit has an output end connected to the slave, and is used to flip the second control signal and then boost it, thereby outputting a third control signal, so that the slave starts working based on the third control signal.
[0006] The transmitting circuit provided by the utility model uses a boost circuit to boost the signal sent by the host and then transmit it to the slave through the bus, thereby improving the anti-interference ability of the communication bus, and the boosted signal has a longer transmission distance, which improves the reliability of communication. In addition, in the normal state without a control signal, the boost circuit and the flip circuit are both kept in the cut-off state, thereby reducing the overall power consumption of the transmitting circuit and reducing the communication cost.
[0007] In an optional embodiment, the flipping circuit includes: a first switching circuit and a first current limiting circuit, wherein the first current limiting circuit has a first end connected to the host and a second end connected to the control end of the first switching circuit, and is used to limit the current flowing into the first switching circuit; the first switching circuit has a first end connected to the first external power supply and a second end connected to the input end of the boost circuit; when the first end of the first current limiting circuit receives a first control signal, the first switching circuit is turned on, and the first switching circuit flips the first control signal and outputs a second control signal.
[0008] In an optional embodiment, the first switching circuit includes: a first switch and a first resistor, wherein the first switch has a control end connected to the first end of the first resistor and the second end of the first current limiting circuit, a first end connected to the first external power supply and the second end of the first resistor, and a second end connected to the input end of the boost circuit; when the control end of the first switch receives a first control signal, the first switch is turned on, and the first switch flips the first control signal and outputs a second control signal through the second end.
[0009] The sending circuit provided by the utility model can control the signal flipping only by controlling the on-off of the first switch, and has a simple circuit structure and low cost.
[0010] In an optional embodiment, the boost circuit includes: a second switching circuit and a second resistor, wherein the second switching circuit has a control end connected to the output end of the flip circuit, a first end connected to the first end of the second resistor and the slave, and a second end connected to the ground; a second resistor has a second end connected to a second external power supply; the voltage of the second external power supply is greater than the voltage of the first control signal; when the control end of the second switching circuit receives the second control signal, the second switching circuit is turned on, and the second switching circuit outputs a third control signal after boosting the second control signal, so that the slave starts working based on the third control signal.
[0011] In an optional embodiment, the second switching circuit includes: a second switch and a third resistor, wherein the second switch has a control end connected to the output end of the flip circuit and the first end of the third resistor, a first end connected to the first end of the second resistor and the slave, and a second end connected to the second end of the third resistor and then grounded; when the control end of the second switch receives a second control signal, the second switch is turned on, and the second switch boosts the second control signal and outputs a third control signal through the first end, so that the slave starts working based on the third control signal.
[0012] The sending circuit provided by the utility model can control the signal flipping only by controlling the on-off of the second switch, and has a simple circuit structure and low cost.
[0013] In an optional embodiment, the boost circuit also includes: a second current limiting circuit, whose first end is connected to the output end of the flip circuit, and whose second end is connected to the control end of the second switch and the first end of the third resistor, and is used to limit the current flowing into the second switch.
[0014] In an optional implementation, the boost circuit further includes: a first suppression circuit, which is connected in parallel with the third resistor and is used to suppress the peak high voltage.
[0015] In the sending circuit provided by the utility model, the first suppression circuit reduces interference in the signal by suppressing the peak high voltage, thereby improving the accuracy of the sending circuit.
[0016] In a second aspect, the utility model provides a communication system, comprising: a host, multiple slaves, a sending circuit and a receiving circuit of the first aspect, wherein the host, its output end is connected to the input end of the flip circuit, and its input end is connected to the output end of the receiving circuit; the input end of each slave is connected to the output end of the boost circuit, and the output end of each slave is connected to the input end of the receiving circuit; the receiving circuit is used to step down the return signal sent by the slave and send it to the host, the return signal indicating that the slave has received a third control signal and started working based on the third control signal; when the host needs to control any slave, the host will boost the first control signal containing the identity information of the corresponding slave through the sending circuit and send it to all slaves, so that the corresponding slave matching the identity information starts working, and receives the return signal based on the corresponding slave through the receiving circuit, so as to determine whether the corresponding slave is working normally.
[0017] The communication system provided by the utility model adopts the master-slave response mode. The host sends a control signal to all slaves at the same time. The control signal contains the identity information of the slave. Only the slave corresponding to the identity information will respond to the host's command. If the identity information of other slaves does not match, no information will be returned, so as to avoid the blockage of bus communication caused by each slave replying to the return signal, improve the reliability of communication, improve the communication efficiency, and ensure the normal operation of the communication system. The sending circuit boosts the control signal of the host and sends it to the slave through the bus, thereby improving the driving ability and anti-interference ability of the control signal, making the signal transmission distance longer and undistorted; the receiving circuit reduces the voltage of the return signal of the slave and transmits it to the host through the bus, so that the return signal voltage adapts to the working voltage of the host, reduces power consumption, and facilitates the host to parse the return signal.
[0018] In an optional embodiment, the receiving circuit includes: a step-down unit and a fourth resistor, wherein the step-down unit has an input end connected to the output end of the slave machine, and an output end connected to the input end of the host machine and the first end of the fourth resistor; the fourth resistor has a second end connected to the first external power supply; when the input end of the step-down unit receives a return signal, the step-down unit is turned on, and the step-down unit steps down the return signal and sends it to the host machine.
[0019] In an optional implementation, the receiving circuit further includes: a second suppression circuit, a first end of which is connected to the second end of the step-down unit, the first end of the fourth resistor and the slave, and a second end of which is grounded, and is used to suppress peak high voltage.
[0020] In the communication system provided by the utility model, the second suppression circuit reduces interference in the signal by suppressing the peak high voltage, thereby improving the accuracy of the receiving circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0022] Figure 1 A composition diagram of a specific example of a sending circuit according to an embodiment of the present utility model;
[0023] Figure 2 A structural diagram of a specific circuit of a sending circuit of an embodiment of the utility model;
[0024] Figure 3 A composition diagram of a specific example of a communication system according to an embodiment of the present utility model;
[0025] Figure 4 A structural diagram of a specific circuit of a receiving circuit of an embodiment of the utility model;
[0026] Figure 5 It is a composition diagram of another specific example of the communication system of the embodiment of the utility model. DETAILED DESCRIPTION
[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0029] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0030] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0031] This embodiment provides a sending circuit, which is used to implement signal transmission from a host to a slave. Figure 1 As shown, the sending circuit includes: a flip circuit 1 and a boost circuit 2, wherein the flip circuit 1 can be composed of structures such as diodes and triodes, and the boost circuit 2 can be an existing circuit such as a DC-DC circuit and a charge pump. The flip circuit 1, whose input end is connected to the host, and whose output end is connected to the input end of the boost circuit 2, is used to flip the first control signal sent by the host and output the second control signal, wherein the first control signal indicates that the host needs to control the slave; the boost circuit 2, whose output end is connected to the slave, is used to flip the second control signal and then boost it, thereby outputting a third control signal, so that the slave starts to work based on the third control signal.
[0032] Exemplarily, the third control signal in this embodiment can be transmitted to the slave via the TTL communication bus. By increasing the voltage of the control signal sent by the host, the driving capability of the control signal is improved, and the control signal has a higher transmission capability, thereby improving the anti-interference capability of the TTL communication bus.
[0033] Specifically, Figure 1In the embodiment, when the host needs to control the slave to work, the host sends a first control signal to the flip circuit 1 to start the flip circuit 1 to start working. The flip circuit 1 flips the first control signal and then outputs a second control signal to the boost circuit 2 to start working. After the output voltage of the boost circuit 2 is set by adjusting the parameters of the boost circuit 2, the boost circuit 2 flips the second control signal according to the preset boost capability and outputs a third control signal after the boost processing, so that the voltage of the third control signal is higher than the voltage of the first control signal while keeping the level logic consistent with the first control signal, thereby improving the transmission capability and driving capability of the third control signal. After that, the third control signal is transmitted to the slave through the bus to drive the slave to start working.
[0034] It should be noted that, under normal conditions, there is no control signal in the transmitting circuit, and the flip circuit and the boost circuit remain in a closed state, that is, the power consumption of the transmitting circuit is low under normal conditions.
[0035] The sending circuit provided in this embodiment uses a boost circuit to boost the signal sent by the host and then transmit it to the slave through the bus, thereby improving the anti-interference ability of the communication bus, and the boosted signal has a longer transmission distance, thereby improving the reliability of communication. In addition, in the normal state without a control signal, the boost circuit and the flip circuit are both kept in the cut-off state, thereby reducing the overall power consumption of the sending circuit and reducing the communication cost.
[0036] In some optional embodiments, such as Figure 2 As shown, the flipping circuit includes: a first switch circuit 11 and a first current limiting circuit 12, wherein the first current limiting circuit 12 has a first end connected to the host, and a second end connected to the control end of the first switch circuit 11, and is used to limit the current flowing into the first switch circuit 11; the first switch circuit 11 has a first end connected to the first external power supply VCC, and a second end connected to the input end of the boost circuit 2; when the first end of the first current limiting circuit 12 receives a first control signal, the first switch circuit 11 is turned on, and the first switch circuit 11 flips the first control signal and outputs a second control signal.
[0037] like Figure 2 As shown, the first switch circuit 11 includes: a first switch Q1 and a first resistor R1, wherein the first switch Q1, its control end is connected to the first end of the first resistor R1 and the second end of the first current limiting circuit 12, its first end is connected to the first external power supply VCC and the second end of the first resistor R1, and its second end is connected to the input end of the boost circuit 2; the first current limiting circuit 12 is composed of a resistor R2; when the control end of the first switch Q1 receives a first control signal, the first switch Q1 is turned on, and the first switch Q1 flips the first control signal and outputs a second control signal through the second end.
[0038] like Figure 2As shown, the boost circuit 2 includes: a second switch circuit 21 and a second resistor R3, wherein the second switch circuit 21, a control end thereof is connected to the output end of the flip circuit 1, a first end thereof is connected to the first end of the second resistor R3 and the slave, and a second end thereof is grounded; a second resistor R3, a second end thereof is connected to a second external power supply VA_9V; the voltage of the second external power supply VA_9V is greater than the voltage of the first control signal; when the control end of the second switch circuit 21 receives the second control signal, the second switch circuit 21 is turned on, and the second switch circuit 21 outputs a third control signal after boosting the second control signal, so that the slave starts to work based on the third control signal.
[0039] like Figure 2 As shown, the second switch circuit 21 includes: a second switch Q2 and a third resistor R4, wherein the second switch Q2, a control end thereof is connected to the output end of the flip circuit 1 and the first end of the third resistor R4, a first end thereof is connected to the first end of the second resistor R3 and the slave, and a second end thereof is connected to the second end of the third resistor R4 and then grounded; when the control end of the second switch Q2 receives the second control signal, the second switch Q2 is turned on, and the second switch Q2 boosts the second control signal and outputs the third control signal through the first end, so that the slave starts to work based on the third control signal.
[0040] For example, Figure 2 In the process, the host side continuously sends out a 5V 485TXD signal. Since the first switch Q1 uses a PNP transistor and the first resistor R1 pulls up the control end of the first switch Q1 to a high level, the 485TXD signal is normally at a high level. That is, when the host does not need to control the slave to work, the 485TXD signal is a continuous high-level signal, so that the first switch Q1 is in a cut-off state, saving circuit power consumption.
[0041] For example, Figure 2 In the embodiment, when the first switch Q1 is in the off state under normal conditions, its second end is at a low level. Since the second switch Q2 uses an NPN transistor and the third resistor R4 pulls the control end of the second switch Q2 down to the ground, the second switch Q2 is in the off state under normal conditions, thus saving circuit power consumption.
[0042] For example, Figure 2 In the embodiment, when the host needs to control the operation of the slave, the host outputs a first control signal, that is, the first end of the first current limiting circuit 12 receives a low-level 485TXD signal with an amplitude of 5V, and the first control signal is input to the control end of the first switch Q1 through the first current limiting circuit 12 to turn on the first switch Q1, and outputs a second control signal with the same amplitude and opposite direction as the first control signal through the second end.
[0043] For example, Figure 2In the embodiment, the second external power supply VA_9V is 9V. When the second control signal of 5V in the opposite direction to the first control signal is input to the control end of the second switch Q2, the second switch Q2 is turned on. After the second switch Q2 flips the direction of the second control signal at the control end again, it outputs a third control signal of 9V in the same direction as the first control signal through its first end. After the sending circuit boosts the first control signal of 5V sent by the host into a third control signal of 9V, the 9V third control signal is transmitted to the slave through the TTL communication bus, so that the slave starts to work.
[0044] It should be noted that the sending circuit improves the reliability of the control signal by increasing the voltage of the control signal, thereby solving the problem of high loss of 5V signal causing signal distortion or failure during transmission on the TTL communication bus, and improving the anti-interference ability of the TTL communication bus.
[0045] In some optional embodiments, such as Figure 2 As shown, the boost circuit 2 also includes: a second current limiting circuit 22 and a first suppression circuit 23, wherein the second current limiting circuit 22 has a first end connected to the output end of the flip circuit 1, and a second end connected to the control end of the second switch Q2 and the first end of the third resistor R4, and is used to limit the current flowing into the second switch Q2; the first suppression circuit 23 is connected in parallel with the third resistor R4, and is used to suppress the peak high voltage.
[0046] For example, Figure 2 As shown, the second current limiting circuit 22 is a resistor R5, and the first suppression circuit 23 is a transient voltage suppression diode D1.
[0047] This embodiment provides a communication system, such as Figure 3 As shown, it includes: a host, multiple slaves (#1~#N), the sending circuit and the receiving circuit 3 of the above embodiments and any optional implementation methods thereof, wherein the output end of the host is connected to the input end of the flip circuit 1, and the input end of the host is connected to the output end of the receiving circuit 3; the input end of each slave is connected to the output end of the boost circuit 2, and the output end of each slave is connected to the input end of the receiving circuit 3.
[0048] Figure 3 In the embodiment, the receiving circuit 3 is used to step down the return signal sent by the slave and send it to the host, and the return signal indicates that the slave has received the third control signal and started to work based on the third control signal; when the host needs to control any slave, the host will step up the first control signal containing the identity information of the corresponding slave through the sending circuit and send it to all slaves, so that the corresponding slave matching the identity information starts to work, and receives the return signal based on the corresponding slave through the receiving circuit 3, so as to determine whether the corresponding slave is working normally.
[0049] Specifically, the host forms a communication system after connecting with multiple slaves through a sending circuit and a receiving circuit. The communication system adopts a master-slave response form. The first control signal sent by the host is broadcast. All slaves can receive the sent signal at the same time, but the slave can only reply to the host return signal individually. The control signal sent by the host contains the identity information of the slave to be controlled. After receiving the signal, the slave with the corresponding identity information will respond to the host's control command and reply to the return signal to the host. Other slaves with unmatched identity information will not respond to the control signal and will not return any information. This avoids multiple slaves replying to the host return signal at the same time, causing the bus communication to be blocked, thereby ensuring the normal operation of the entire bus communication.
[0050] It should be noted that the control signal processing method and transmission method involved in this embodiment are both existing technologies and will not be described in detail here.
[0051] The communication system provided in this embodiment adopts the master-slave response mode. The host sends a control signal to all slaves at the same time. The control signal contains the identity information of the slave. Only the slave corresponding to the identity information will respond to the host's command. If the identity information of other slaves does not match, no information will be returned. This avoids the blockage of bus communication caused by each slave replying to the return signal, improves the reliability of communication, improves the communication efficiency, and ensures the normal operation of the communication system. The sending circuit boosts the control signal of the host and sends it to the slave through the bus, thereby improving the driving ability and anti-interference ability of the control signal, making the signal transmission distance longer and undistorted; the receiving circuit reduces the voltage of the return signal of the slave and transmits it to the host through the bus, so that the return signal voltage adapts to the working voltage of the host, reduces power consumption, and facilitates the host to parse the return signal.
[0052] In some optional embodiments, such as Figure 4 As shown, the receiving circuit includes: a step-down unit 31 and a fourth resistor R6, wherein the step-down unit 31 has an input end connected to the output end of the slave, and an output end connected to the input end of the host and a first end of the fourth resistor R6; the fourth resistor R6 has a second end connected to the first external power supply VCC; when the input end of the step-down unit 31 receives a return signal, the step-down unit 31 is turned on, and the step-down unit steps down the return signal and sends it to the host.
[0053] like Figure 4 As shown, the receiving circuit also includes: a second suppression circuit 32, a first end of which is connected to the second end of the step-down unit 31, the first end of the fourth resistor R6 and the slave, and a second end of which is grounded, and is used to suppress the peak high voltage.
[0054] For example, Figure 4In the embodiment, the step-down unit 31 is a diode D2, and the second suppression circuit 32 is a transient voltage suppression diode D3. The slave side continuously sends a 9V USB RXD signal, which is normally at a high level. The fourth resistor R6 pulls up the anode of the diode D2 to a high level, and the diode D2 is in a cut-off state.
[0055] For example, Figure 4 In the example, when the slave has a return signal, the USB RXD signal becomes a low-level signal of 9V, making the diode D2 conductive, and the 485RXD signal at the host receiving end also becomes a low-level signal of 5V, so that the host receives the return signal from the slave.
[0056] Exemplarily, the communication system may also be Figure 5 In the structure shown, the host may include a transmitting circuit and a receiving circuit, and each slave may also include a transmitting circuit and a receiving circuit. After the host boosts the control signal through the transmitting circuit, the boosted control signal is sent to the receiving circuit of each slave through the TTL communication bus. The receiving circuit of the slave reduces the voltage of the control signal to enable the slave to start working; after the corresponding slave starts working, a return signal is generated, and the slave uses its own transmitting circuit to boost the return signal, and sends the boosted return signal to the receiving circuit of the host through the TTL communication bus. The receiving circuit of the host reduces the voltage of the return signal to enable the host to analyze the status of the corresponding slave based on the return signal.
[0057] It should be noted that Figure 5 The structures and functions of the host transmitting circuit, the slave transmitting circuit, the host receiving circuit and the slave receiving circuit are consistent with the transmitting circuit and the receiving circuit in the above embodiment and any optional implementation manner thereof, and will not be repeated here.
[0058] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.
Claims
1. A transmitting circuit, characterized in that: It is used to realize signal transmission from the host to the slave, and the sending circuit includes: a flip circuit and a boost circuit, wherein: The flip circuit has an input end connected to the host and an output end connected to the input end of the boost circuit, and the flip circuit is used to flip a first control signal sent by the host and then output a second control signal, wherein the first control signal indicates that the host needs to control the slave; The boost circuit has an output end connected to the slave, and is used to invert the second control signal and then boost it, thereby outputting a third control signal, so that the slave starts working based on the third control signal.
2. The transmitting circuit according to claim 1, characterized in that: The flip circuit includes: a first switch circuit and a first current limiting circuit, wherein: The first current limiting circuit has a first end connected to the host and a second end connected to the control end of the first switch circuit, and is used to limit the current flowing into the first switch circuit; The first switch circuit has a first end connected to a first external power source, and a second end connected to an input end of the boost circuit; When the first end of the first current limiting circuit receives the first control signal, the first switch circuit is turned on, and the first switch circuit flips the first control signal and then outputs the second control signal.
3. The transmitting circuit according to claim 2, characterized in that: The first switch circuit includes: a first switch and a first resistor, wherein: The first switch has a control end connected to the first end of the first resistor and the second end of the first current limiting circuit, a first end connected to the first external power supply and the second end of the first resistor, and a second end connected to the input end of the boost circuit; When the control end of the first switch receives the first control signal, the first switch is turned on, and the first switch flips the first control signal and outputs the second control signal through the second end.
4. The transmitting circuit according to claim 1, characterized in that: The boost circuit includes: a second switch circuit and a second resistor, wherein: The second switch circuit has a control end connected to the output end of the flip circuit, a first end connected to the first end of the second resistor and the slave, and a second end connected to ground; The second resistor has a second end connected to a second external power source; The second external power supply voltage is greater than the voltage of the first control signal; When the control end of the second switch circuit receives the second control signal, the second switch circuit is turned on, and the second switch circuit boosts the second control signal and outputs the third control signal, so that the slave starts to work based on the third control signal.
5. The transmitting circuit according to claim 4, characterized in that: The second switch circuit includes: a second switch and a third resistor, wherein: The second switch has a control end connected to the output end of the flip circuit and the first end of the third resistor, a first end connected to the first end of the second resistor and the slave, and a second end connected to the second end of the third resistor and then grounded; When the control end of the second switch receives the second control signal, the second switch is turned on, and the second switch boosts the second control signal and outputs the third control signal through the first end, so that the slave starts working based on the third control signal.
6. The transmitting circuit according to claim 5, characterized in that: The boost circuit further includes: A second current limiting circuit has a first end connected to the output end of the flip circuit, and a second end connected to the control end of the second switch and the first end of the third resistor. The second current limiting circuit is used to limit the current flowing into the second switch.
7. The transmitting circuit according to claim 5, characterized in that: The boost circuit further includes: The first suppression circuit is connected in parallel with the third resistor and is used for suppressing the peak high voltage.
8. A communication system, characterized in that: include: A host, a plurality of slaves, a transmitting circuit and a receiving circuit according to any one of claims 1 to 7, wherein: The host, whose output end is connected to the input end of the flip circuit, and whose input end is connected to the output end of the receiving circuit; The input end of each of the slaves is connected to the output end of the boost circuit, and the output end of each of the slaves is connected to the input end of the receiving circuit; The receiving circuit is used for reducing the voltage of the return signal sent by the slave and sending it to the host, wherein the return signal indicates that the slave has received the third control signal and started to work based on the third control signal; When the host needs to control any of the slaves, the host will send the first control signal containing the corresponding slave identity information to all slaves after boosting it through the sending circuit, so that the corresponding slave matching the identity information starts working, and receives the return signal of the corresponding slave through the receiving circuit to determine whether the corresponding slave is working normally.
9. The communication system according to claim 8, characterized in that: The receiving circuit includes: a step-down unit and a fourth resistor, wherein: The step-down unit has an input end connected to the output end of the slave, and an output end connected to the input end of the host and the first end of the fourth resistor; The fourth resistor, a second end of which is connected to the first external power source; When the input end of the step-down unit receives the return signal, the step-down unit is turned on, and the step-down unit steps down the return signal and sends it to the host.
10. The communication system according to claim 9, characterized in that: The receiving circuit also includes: The second suppression circuit has a first end connected to the second end of the step-down unit, the first end of the fourth resistor and the slave, and a second end connected to ground, and is used for suppressing peak high voltage.