Communication circuit, communication device and sequencing system

Abstract

The utility model discloses a communication circuit, a communication device and a sequencing system, the communication circuit is electrically connected between a double-wire serial port device and a single-wire serial port device, and the communication circuit comprises a first conversion circuit, a second conversion circuit and a first voltage source; a first power supply end and a second power supply end of the first conversion circuit are electrically connected with a first voltage source and a second voltage source respectively; a signal input end and a signal output end of the first conversion circuit are electrically connected with a signal output end of the double-line serial port equipment and a communication end of the single-line serial port equipment respectively; the first power supply end and the second power supply end of the second conversion circuit are electrically connected with the second voltage source and the first voltage source respectively; the signal input end and the signal output end of the second conversion circuit are electrically connected with the communication end of the single-wire serial port equipment and the signal input end of the double-wire serial port equipment respectively; the circuit is simple and reliable, and communication and electrical isolation of double-wire serial port equipment and single-wire serial port equipment are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of serial communication, and in particular to a communication circuit, a communication device and a sequencing system. Background Art

[0002] A Universal Asynchronous Receiver / Transmitter (UART) is a universal serial data bus used for asynchronous communication, enabling bidirectional communication. Serial communication devices with dual buses (i.e., two-wire serial devices) can achieve full-duplex communication, allowing simultaneous transmission and reception of data. While dual-bus serial communication devices are the most commonly used, single-bus serial communication devices (i.e., single-wire serial devices) also exist in specialized applications. These devices are relatively simple to wire, requiring only a single bus for both data transmission and reception. They operate in a time-sharing, half-duplex mode, meaning only one bus can be used for transmission or reception at a time. The master device determines whether the bus is transmitting or receiving.

[0003] In some applications, a dual-bus serial communication device needs to communicate data with a single-bus serial communication device, while also requiring electrical isolation between the two devices. Current circuit designs for communication between dual-wire and single-wire serial devices are complex, failing to achieve electrical isolation between the two devices and potentially damaging the communication devices. Utility Model Content

[0004] The utility model provides a communication circuit, a communication device and a sequencing system, which can realize communication and electrical isolation between a dual-line serial port device and a single-line serial port device.

[0005] According to one aspect of the present invention, a communication circuit is provided, electrically connected between a two-wire serial port device and a single-wire serial port device, the communication circuit comprising: a first conversion circuit, a second conversion circuit and a first voltage source;

[0006] The first power supply terminal and the second power supply terminal of the first conversion circuit are electrically connected to the first voltage source and the second voltage source respectively, and the signal input terminal and the signal output terminal of the first conversion circuit are electrically connected to the signal output terminal of the two-wire serial port device and the communication terminal of the single-wire serial port device respectively;

[0007] The first power supply terminal and the second power supply terminal of the second conversion circuit are electrically connected to the second voltage source and the first voltage source respectively, and the signal input terminal and the signal output terminal of the second conversion circuit are electrically connected to the communication terminal of the single-wire serial port device and the signal input terminal of the dual-wire serial port device respectively;

[0008] The voltage signals output by the first voltage source and the second voltage source are different.

[0009] Optionally, the first conversion circuit includes: a first optical coupler;

[0010] The input side power supply terminal of the first optical coupler is electrically connected to the first voltage source, and the signal input terminal of the first optical coupler is electrically connected to the signal output terminal of the two-wire serial port device;

[0011] The signal output terminal of the first optical coupler is electrically connected to the second voltage source and the communication terminal of the single-wire serial port device.

[0012] Optionally, the first optical coupler includes a first light emitting diode, a first phototransistor and a first diode;

[0013] The anode of the first light-emitting diode is electrically connected to the first voltage source, and the cathode of the first light-emitting diode is electrically connected to the signal output terminal of the two-wire serial port device;

[0014] The cathode of the first diode is electrically connected to the second voltage source, and the anode of the first diode is electrically connected to the base of the first phototransistor;

[0015] The collector of the first phototransistor is electrically connected to the second voltage source and the communication terminal of the single-wire serial port device, and the emitter of the first phototransistor is electrically connected to the first ground terminal.

[0016] Optionally, the first conversion circuit further includes: a first current limiting module;

[0017] The first current limiting module is electrically connected between the first voltage source and the input side power supply terminal of the first optocoupler.

[0018] Optionally, the first conversion circuit further includes: a first pull-up module;

[0019] A first end of the first pull-up module is electrically connected to the second voltage source, and a second end of the first pull-up module is electrically connected to the signal output end of the first optocoupler.

[0020] Optionally, the first conversion circuit further includes: a second current limiting module;

[0021] A first end of the second current limiting module is electrically connected to the signal output end of the first optical coupler, and a second end of the second current limiting module is electrically connected to the communication end of the single-wire serial port device.

[0022] Optionally, the second conversion circuit includes: a second optical coupler;

[0023] The input side power supply terminal of the second optical coupler is electrically connected to the second voltage source, and the signal input terminal of the second optical coupler is electrically connected to the communication terminal of the single-wire serial port device;

[0024] The signal output terminal of the second optical coupler is electrically connected to the first voltage source and the signal input terminal of the two-wire serial port device.

[0025] Optionally, the second optical coupler includes a second light emitting diode, a second phototransistor and a second diode;

[0026] An anode of the second light-emitting diode is electrically connected to the second voltage source, and a cathode of the second light-emitting diode is electrically connected to a communication terminal of the single-wire serial port device;

[0027] The cathode of the second diode is electrically connected to the first voltage source, and the anode of the second diode is electrically connected to the base of the second phototransistor;

[0028] The collector of the second phototransistor is electrically connected to the first voltage source and the signal input terminal of the two-wire serial port device, and the emitter of the second phototransistor is electrically connected to the second ground terminal.

[0029] Optionally, the second conversion circuit further includes: a third current limiting module;

[0030] The third current limiting module is electrically connected between the second voltage source and the input side power supply terminal of the second optocoupler.

[0031] Optionally, the second conversion circuit further includes: a second pull-up module;

[0032] A first end of the second pull-up module is electrically connected to the first voltage source, and a second end of the second pull-up module is electrically connected to the signal output end of the second optocoupler.

[0033] Optionally, the first voltage source includes: an isolated power supply chip;

[0034] The input end of the isolated power supply chip is electrically connected to the second voltage source, and the output end of the isolated power supply chip is electrically connected to the first power supply end of the first conversion circuit and the second power supply end of the second conversion circuit;

[0035] The input ground terminal of the isolated power supply chip is electrically connected to the first ground terminal, and the output ground terminal of the isolated power supply chip is electrically connected to the second ground terminal.

[0036] Optionally, the first voltage source further includes: a first filtering module;

[0037] The first filtering module is electrically connected to the second voltage source and the input end of the isolation power supply chip respectively.

[0038] Optionally, the first voltage source further includes: a second filtering module;

[0039] The second filtering module is electrically connected to the output end of the isolated power supply chip, the first power supply end of the first conversion circuit, and the second power supply end of the second conversion circuit respectively.

[0040] According to another aspect of the present invention, a communication device is provided, comprising a dual-wire serial port device, a single-wire serial port device and the above-mentioned communication circuit.

[0041] Optionally, the single-wire serial port device includes a motor drive circuit;

[0042] The communication terminal of the motor drive circuit is electrically connected to the signal output terminal of the first conversion circuit and the signal input terminal of the second conversion circuit;

[0043] The current output end of the motor driving circuit is electrically connected to the motor.

[0044] Optionally, the motor drive circuit includes: a drive chip.

[0045] Optionally, the motor drive circuit further includes: a power signal filtering module;

[0046] The power signal filtering module is electrically connected between an external power source and a power terminal of the driving chip.

[0047] Optionally, the motor drive circuit further includes: a charge pump module;

[0048] The charge pump module is electrically connected to the charge pump terminal of the driving chip.

[0049] Optionally, the motor drive circuit further includes: an output voltage filtering module;

[0050] The output voltage filter module is electrically connected between the voltage output terminal of the driver chip and the ground terminal.

[0051] Optionally, the motor drive circuit further includes: a voltage dividing module;

[0052] The voltage dividing module is electrically connected between the voltage output terminal of the driving chip and the voltage output terminal reference voltage terminal of the driving chip.

[0053] Optionally, the motor drive circuit further includes: a first pull-down module;

[0054] The driver chip also includes a power regulator;

[0055] The first pull-down module is electrically connected between the power regulator and a ground terminal.

[0056] Optionally, the motor drive circuit further includes: a second pull-down module;

[0057] The driver chip also includes a chopper;

[0058] The second pull-down module is electrically connected between the chopper and a ground terminal.

[0059] Optionally, the two-wire serial port device includes a single-chip microcomputer.

[0060] According to another aspect of the present invention, a sequencing system is provided, comprising the above-mentioned communication circuit, or comprising the above-mentioned communication device.

[0061] The communication circuit provided by the embodiment of the present invention is provided with a first conversion circuit between the signal output terminal of the dual-wire serial port device and the communication terminal of the single-wire serial port device. When the dual-wire serial port device sends a signal to the single-wire serial port device, the signal output by the dual-wire serial port device is converted by the first conversion circuit and transmitted to the single-wire serial port device. A second conversion circuit is provided between the communication terminal of the single-wire serial port device and the signal input terminal of the dual-wire serial port device. When the single-wire serial port device sends a signal to the dual-wire serial port device, the signal output by the single-wire serial port device is converted by the second conversion circuit and transmitted to the dual-wire serial port device. A two-wire serial port device is provided, and a first power supply end and a second power supply end of a first conversion circuit are respectively electrically connected to the first voltage source and the second voltage source, and a first power supply end and a second power supply end of a second conversion circuit are respectively electrically connected to the second voltage source and the first voltage source, so that the first conversion circuit and the second conversion circuit can realize power supply isolation of input signals and output signals, thereby realizing power supply isolation between the two-wire serial port device and the single-wire serial port device, which is beneficial to the isolation protection of the two-wire serial port device and the single-wire serial port device, and the circuit is simple and reliable, and can realize reliable communication between the two-wire serial port device and the single-wire serial port device.

[0062] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0064] Figure 1 This is a schematic structural diagram of a communication circuit provided by an embodiment of the present utility model;

[0065] Figure 2 This is a structural diagram of another communication circuit provided by an embodiment of the present utility model;

[0066] Figure 3 This is a structural diagram of a first voltage source provided by an embodiment of the present utility model;

[0067] Figure 4 This is a schematic structural diagram of a communication device provided by an embodiment of the present utility model;

[0068] Figure 5 This is a structural diagram of a motor drive circuit provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0069] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0070] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0071] The embodiment of the utility model provides a communication circuit, Figure 1 This is a schematic diagram of the structure of a communication circuit provided by an embodiment of the present utility model. Figure 1As shown, the communication circuit A0 is electrically connected between the two-wire serial port device A1 and the single-wire serial port device A2. The communication circuit A0 includes: a first conversion circuit 10, a second conversion circuit 20 and a first voltage source 30; the first power supply terminal V11 of the first conversion circuit 10 is electrically connected to the first voltage source 30, and the signal input terminal VIN1 of the first conversion circuit 10 is electrically connected to the signal output terminal TX of the two-wire serial port device A1; the second power supply terminal V12 of the first conversion circuit 10 is electrically connected to the second voltage source 40, and the signal output terminal VOUT1 of the first conversion circuit 10 is electrically connected to the single-wire serial port device A2. The first power supply terminal V21 of the second conversion circuit 20 is electrically connected to the second voltage source 40, and the signal input terminal VIN2 of the second conversion circuit 20 is electrically connected to the communication terminal TR of the single-wire serial port device A2; the second power supply terminal V22 of the second conversion circuit 20 is electrically connected to the first voltage source 30, and the signal output terminal VOUT2 of the second conversion circuit 20 is electrically connected to the signal input terminal RX of the two-wire serial port device A1; wherein the voltage signal output by the first voltage source 30 is different from the voltage signal output by the second voltage source 40.

[0072] The first power supply terminal V11 of the first conversion circuit 10 is located on the same side as the signal input terminal VIN1, and the second power supply terminal V12 of the first conversion circuit 10 is located on the same side as the signal output terminal VOUT1. The first power supply terminal V21 of the second conversion circuit 20 is located on the same side as the signal input terminal VIN2, and the second power supply terminal V22 of the second conversion circuit 20 is located on the same side as the signal output terminal VOUT2.

[0073] The first voltage source 30 outputs a first voltage signal, and the second voltage source 40 outputs a second voltage signal. The first voltage signal and the second voltage signal are different.

[0074] Specifically, the first conversion circuit 10 is configured such that its signal input terminal VIN1 is electrically connected to the signal output terminal TX of the two-wire serial port device A1, and its signal output terminal VOUT1 is electrically connected to the communication terminal TR of the single-wire serial port device A2. Therefore, when the two-wire serial port device A1 transmits a signal to the single-wire serial port device A2, the signal output by the two-wire serial port device A1 can be converted by the first conversion circuit 10 and transmitted to the single-wire serial port device A2. Furthermore, in the first conversion circuit 10, the first power supply terminal V11 can be an input-side power supply terminal for providing a power signal to the input-side circuit of the first conversion circuit 10, and the second power supply terminal V12 can be an output-side power supply terminal for providing a power signal to the output-side circuit of the first conversion circuit 10. The first power supply terminal V11 is electrically connected to the first voltage source 30, the second power supply terminal V12 is electrically connected to the second voltage source 40, and the first voltage signal provided by the first voltage source 30 is different from the second voltage signal provided by the second voltage source 40, that is, the first voltage source 30 and the second voltage source 40 are two independent power supplies, so that the input side circuit and the output side circuit of the first conversion circuit 10 can be power-isolated, thereby achieving power isolation of the input signal of the signal input terminal VIN1 and the output signal of the signal output terminal VOUT1.

[0075] The second conversion circuit 20 is configured such that its signal input terminal VIN2 is electrically connected to the communication terminal TR of the single-wire serial port device A2, and its signal output terminal VOUT2 is electrically connected to the signal input terminal RX of the dual-wire serial port device A1. Therefore, when the single-wire serial port device A2 transmits a signal to the dual-wire serial port device A1, the signal output by the single-wire serial port device A2 can be converted by the second conversion circuit 20 and transmitted to the dual-wire serial port device A1. Furthermore, in the second conversion circuit 20, the first power supply terminal V21 can be an input-side power supply terminal for providing a power signal to the input-side circuit of the second conversion circuit 20, and the second power supply terminal V22 can be an output-side power supply terminal for providing a power signal to the output-side circuit of the second conversion circuit 20. By electrically connecting the first power supply terminal V21 to the second voltage source 40 and the second power supply terminal V22 to the first voltage source 30, power supply isolation can be achieved between the input-side circuit and the output-side circuit of the second conversion circuit 20, thereby isolating the input signal at the signal input terminal VIN2 from the output signal at the signal output terminal VOUT2.

[0076] The communication circuit provided by the embodiment of the present invention is provided with a first conversion circuit between the signal output terminal of the dual-wire serial port device and the communication terminal of the single-wire serial port device. When the dual-wire serial port device sends a signal to the single-wire serial port device, the signal output by the dual-wire serial port device is converted by the first conversion circuit and transmitted to the single-wire serial port device. A second conversion circuit is provided between the communication terminal of the single-wire serial port device and the signal input terminal of the dual-wire serial port device. When the single-wire serial port device sends a signal to the dual-wire serial port device, the signal output by the single-wire serial port device is converted by the second conversion circuit and transmitted to the dual-wire serial port device. A two-wire serial port device is provided, and a first power supply end and a second power supply end of a first conversion circuit are respectively electrically connected to the first voltage source and the second voltage source, and a first power supply end and a second power supply end of a second conversion circuit are respectively electrically connected to the second voltage source and the first voltage source, so that the first conversion circuit and the second conversion circuit can realize power supply isolation of input signals and output signals, thereby realizing power supply isolation between the two-wire serial port device and the single-wire serial port device, which is beneficial to the isolation protection of the two-wire serial port device and the single-wire serial port device, and the circuit is simple and reliable, and can realize reliable communication between the two-wire serial port device and the single-wire serial port device.

[0077] Optional, Figure 2 This is a schematic diagram of another communication circuit provided by an embodiment of the present utility model. Figure 2 As shown, the first conversion circuit 10 includes: a first optocoupler 11; the input side power supply terminal of the first optocoupler 11 is electrically connected to the first voltage source 30, and the signal input terminal of the first optocoupler 11 is electrically connected to the signal output terminal TX of the two-wire serial port device A1; the signal output terminal of the first optocoupler 11 is electrically connected to the second voltage source 40 and the communication terminal of the single-wire serial port device A2.

[0078] Specifically, the first conversion circuit 10 is configured to include a first optocoupler 11. During the process of the two-wire serial port device A1 sending a signal to the single-wire serial port device A2, electrical isolation can be achieved between the two-wire serial port device A1 and the single-wire serial port device A2, thereby achieving isolation protection between the two-wire serial port device A1 and the single-wire serial port device A2.

[0079] Optional, reference Figure 2 The first optocoupler 11 includes a first light-emitting diode D01, a first phototransistor T1 and a first diode D1; the anode of the first light-emitting diode D01 is electrically connected to the first voltage source 30, and the cathode of the first light-emitting diode D01 is electrically connected to the signal output terminal TX of the two-wire serial port device A1; the cathode of the first diode D1 is electrically connected to the second voltage source 40, and the anode of the first diode D1 is electrically connected to the base of the first phototransistor T1; the collector of the first phototransistor T1 is electrically connected to the communication terminal TR of the single-wire serial port device A2 of the second voltage source 40, and the emitter of the first phototransistor T1 is electrically connected to the first ground terminal GND1.

[0080] Specifically, the anode of the first light-emitting diode D01 serves as the input-side power supply terminal of the first optocoupler 11 and is electrically connected to the first voltage source 30. The cathode of the first light-emitting diode D01 serves as the signal input terminal of the first light-emitting diode 11 and is electrically connected to the signal output terminal TX of the two-wire serial port device A1. When the signal output terminal TX of the two-wire serial port device A1 outputs a low-level signal, the voltage difference between the anode and cathode of the first light-emitting diode D01 exceeds its conduction threshold voltage, causing the first light-emitting diode D01 to turn on and emit light. The collector of the first phototransistor T1 serves as the signal output terminal of the first optocoupler 11 and is electrically connected to the second voltage source 40 and the communication terminal TR of the single-wire serial port device A2. After the first light-emitting diode D01 turns on and emits light, the first phototransistor T1 is turned on, thereby conducting between the collector and emitter of the first phototransistor T1, and the collector is grounded, so that the collector of the first phototransistor T1 outputs a low-level signal. On the contrary, when the signal output terminal TX of the two-wire serial port device A1 outputs a high-level signal, the voltage difference between the anode and cathode of the first light-emitting diode D01 is less than its conduction threshold voltage, so that the first light-emitting diode D01 is in the cut-off state, so that the first phototransistor T1 is disconnected, and the collector and emitter of the first phototransistor T1 are disconnected. The signal of the collector is the second voltage signal provided by the second voltage source 40, so that the collector of the first phototransistor T1 outputs a high-level signal. In which, the first optocoupler is provided to include a first diode D1, and the cathode of the first diode D1 and the collector of the first phototransistor T1 are both electrically connected to the second voltage source 40, and the anode is electrically connected to the base of the first phototransistor T1. In this way, when the voltage of the collector of the first phototransistor T1 is abnormally too high, the excessive voltage can cause the first diode D1 to reversely break down and turn on, so that the excessive voltage of the collector of the first phototransistor T1 is transmitted to the base of the first phototransistor T1 through the first diode D1, so that the first phototransistor T1 is turned on, so that the collector voltage of the first phototransistor T1 can be grounded, thereby realizing overvoltage protection for the second voltage source 40.

[0081] Optional, continue to refer to Figure 2 The first conversion circuit 10 further includes: a first current limiting module 12 ; the first current limiting module 12 is electrically connected between the first voltage source 30 and the input side power supply terminal of the first optocoupler 11 .

[0082] Specifically, the first current limiting module 12 can limit the current of the power signal provided by the first voltage source 30 to prevent excessive current from being transmitted to the first optocoupler 11, thereby preventing overcurrent damage to the first optocoupler 11. The first current limiting module 12 can include at least one resistor, and when multiple resistors are included, the resistors can be connected in series or in parallel, or in combination. The embodiment of the present invention does not specifically limit the number and circuit structure of the resistors in the first current limiting module 12, as long as the current limiting function can be achieved. In an optional embodiment, the first current limiting module 12 can include a first resistor R1.

[0083] Optionally, the first conversion circuit 10 further includes: a first pull-up module 13 ; a first end of the first pull-up module 13 is electrically connected to the second voltage source 40 , and a second end of the first pull-up module 13 is electrically connected to the signal output end of the first optocoupler 11 .

[0084] Specifically, a first pull-up module 13 is provided between the second voltage source 40 and the signal output end of the first optocoupler 11, that is, the first pull-up module 13 is electrically connected between the second voltage source 40 and the collector of the first phototransistor T1, and can provide a pull-up voltage for the collector of the first phototransistor T1. When the first phototransistor T1 is in the disconnected state, the collector of the first phototransistor T1 outputs a high-level signal provided by the second voltage source 40. At the same time, the first pull-up module 13 can also play a current limiting role to prevent the second voltage source 40 from providing too much current to the first phototransistor T1, thereby protecting the first phototransistor T1 from damage due to overcurrent. Among them, the first pull-up module 13 can include at least one resistor, and when including multiple resistors, each resistor can be connected in series or in parallel, or in combination of series and parallel. The embodiment of the utility model does not specifically limit the number and circuit structure of the resistors in the first pull-up module 13, as long as they can perform the corresponding functions. In an optional embodiment, the first pull-up module 13 can include a second resistor R2. When the communication terminal TR of the single-wire serial port device A2 outputs a high-level signal, in order to ensure that the first optocoupler 11 does not suffer an overvoltage fault due to the high voltage at its signal output terminal, the resistance value r2 of R2 can be set to satisfy r2>vcc2 / i1, where vcc2 is the second voltage signal and i1 is the maximum output current of the signal output terminal of the first optocoupler 11.

[0085] Optional, continue to refer to Figure 2 The first conversion circuit 10 further includes: a second current limiting module 14; a first end of the second current limiting module 14 is electrically connected to the signal output end of the first optocoupler 11, and a second end of the second current limiting module 14 is electrically connected to the communication end TR of the single-wire serial port device A2.

[0086] Specifically, a second current-limiting module 14 is provided between the signal output terminal of the first optocoupler 11 and the communication terminal TR of the single-wire serial port device A2. Specifically, the second current-limiting module 14 is electrically connected between the collector of the first phototransistor T1 and the communication terminal TR of the single-wire serial port device A2. On the one hand, the second current-limiting module 14 can limit the current of the signal output from the collector of the first phototransistor T1 to the single-wire serial port device A2, thereby preventing excessive current output from the collector of the first phototransistor T1 from causing overcurrent damage to the single-wire serial port device A2. On the other hand, if the dual-wire serial port device A1 outputs a low-level signal through its signal output terminal TX, and the single-wire serial port device A2 simultaneously outputs a high-level signal through its communication terminal TR, the voltage-dividing and current-limiting effects of the second current-limiting module 14 can prevent damage to the first optocoupler 11 due to excessive voltage or current at its signal output terminal. Furthermore, when the dual-wire serial port device A1 outputs a low-level signal through its signal output terminal TX, and the single-wire serial port device A2 simultaneously outputs a high-level signal through its communication terminal TR, the voltage divider function of the second current limiting module 14 prevents the communication terminal TR of the single-wire serial port device A2 from being grounded via the first phototransistor T1, thereby preventing the high-level signal output by the single-wire serial port device A2 from being converted to a low-level signal. This prevents the signal transmission from the single-wire serial port device A2 to the signal input terminal RX of the dual-wire serial port device A1 from being affected, and enables the communication terminal TR of the single-wire serial port device A2 to remain at a high level, allowing the second conversion circuit 20 to ensure that the high-level signal of the single-wire serial port device A2 is transmitted to the signal input terminal RX of the dual-wire serial port device A1. The second current limiting module 14 may include at least one resistor, and when multiple resistors are included, the resistors may be connected in series or in parallel, or in a combination of series and parallel. The present embodiment does not specifically limit the number and circuit structure of the resistors in the second current limiting module 14, as long as they can perform the corresponding functions. In an optional embodiment, the second current limiting module 14 may include a third resistor R3.

[0087] Optional, continue to refer to Figure 2 The second conversion circuit 20 includes: a second optocoupler 21; an input side power supply terminal of the second optocoupler 21 is electrically connected to the second voltage source 40, and a signal input terminal of the second optocoupler 21 is electrically connected to the communication terminal TR of the single-wire serial port device A2; a signal output terminal of the second optocoupler 21 is electrically connected to the first voltage source 30 and the signal input terminal RX of the two-wire serial port device A1.

[0088] Specifically, the second conversion circuit 20 is configured to include a second optocoupler 21, so that when the single-wire serial port device A2 sends a signal to the dual-wire serial port device A1, electrical isolation can be achieved between the single-wire serial port device A2 and the dual-wire serial port device A1, thereby achieving isolation protection for the single-wire serial port device A2 and the dual-wire serial port device A1.

[0089] Optional, continue to refer to Figure 2 The second optocoupler 21 includes a second light-emitting diode D02, a second phototransistor T2, and a second diode D2; the anode of the second light-emitting diode D02 is electrically connected to the second voltage source 40, and the cathode of the second light-emitting diode D02 is electrically connected to the communication terminal TR of the single-wire serial port device A2; the cathode of the second diode D2 is electrically connected to the first voltage source 30, and the anode of the second diode D2 is electrically connected to the base of the second phototransistor T2; the collector of the second phototransistor T2 is electrically connected to the first voltage source 30 and the signal input terminal RX of the two-wire serial port device, and the emitter of the second phototransistor T2 is electrically connected to the second ground terminal GND1.

[0090] Specifically, the anode of the second light-emitting diode D02 serves as the input-side power supply terminal of the second optocoupler 21 and is electrically connected to the second voltage source 40. The cathode of the second light-emitting diode D02 serves as the signal input terminal of the second optocoupler 21 and is electrically connected to the communication terminal TR of the single-wire serial port device A2. When the communication terminal TR of the single-wire serial port device A2 outputs a low-level signal, the voltage difference between the anode and cathode of the second light-emitting diode D02 exceeds its conduction threshold voltage, causing the second light-emitting diode D02 to turn on and emit light. The collector of the second phototransistor T2 serves as the signal output terminal of the second optocoupler 21 and is electrically connected to the first voltage source 30 and the signal input terminal RX of the two-wire serial port device A1. When the second light-emitting diode D02 turns on and emits light, the second phototransistor T2 is turned on, thereby conducting between the collector and emitter of the second phototransistor T2, and the collector is grounded, causing the collector of the second phototransistor T2 to output a low-level signal. On the contrary, when the communication terminal TR of the single-wire serial port device A2 outputs a high-level signal, the voltage difference between the anode and cathode of the second light-emitting diode D02 is less than its conduction threshold voltage, so that the second light-emitting diode D02 is in the cut-off state, so that the second phototransistor T2 is disconnected, and the collector and emitter of the second phototransistor T2 are disconnected. The signal of the collector is the first voltage signal provided by the first voltage source 30, so that the collector of the second phototransistor T2 outputs a high-level signal. In which, the second optocoupler 21 is provided to include a second diode D2, and the cathode of the second diode D2 and the collector of the second phototransistor T2 are both electrically connected to the first voltage source 10, and the anode is electrically connected to the base of the second phototransistor T2. In this way, when the voltage of the collector of the second phototransistor T2 is abnormally too high, the excessive voltage can cause the second diode D2 to reversely break down and turn on, so that the excessive voltage on the collector of the second phototransistor T2 is transmitted to the base of the second phototransistor T2 through the second diode D2, turning on the second phototransistor T2, so that the collector voltage of the second phototransistor T2 can be grounded, thereby achieving overvoltage protection for the first voltage source 30.

[0091] It can be understood that the embodiment of the present invention only exemplifies a specific structure of the first optocoupler 11 and the specific structure of the second optocoupler 21. In other feasible embodiments, the first optocoupler 11 and the second optocoupler 21 can also be other circuit structures, as long as they can achieve the functions required by the embodiment of the present invention. The embodiment of the present invention does not make specific limitations on this.

[0092] Optional, continue to refer to Figure 2 The second conversion circuit 20 further includes a third current limiting module 22 ; the third current limiting module 22 is electrically connected between the second voltage source 40 and the input side power supply terminal of the second optocoupler 21 .

[0093] Specifically, the third current limiting module 22 can limit the current of the power signal provided by the second voltage source 40 to prevent excessive current from being transmitted to the second optocoupler 21, thereby preventing overcurrent damage to the second optocoupler 21. The third current limiting module 22 can include at least one resistor, and when including multiple resistors, the resistors can be connected in series or in parallel, or in a combination of series and parallel. The embodiment of the present invention does not specifically limit the number and circuit structure of the resistors in the third current limiting module 22, as long as the current limiting function can be achieved. In an optional embodiment, the third current limiting module 12 can include a fourth resistor R4.

[0094] Optional, continue to refer to Figure 2 The second conversion circuit 20 further includes: a second pull-up module 23 ; a first end of the second pull-up module 23 is electrically connected to the first voltage source 30 , and a second end of the second pull-up module 23 is electrically connected to the signal output end of the second optocoupler 21 .

[0095] Specifically, a second pull-up module 23 is provided between the first voltage source 30 and the signal output end of the second optical coupler 21, that is, the second pull-up module 23 is electrically connected between the first voltage source 30 and the collector of the second phototransistor T2, and can provide a pull-up voltage for the collector of the second phototransistor T2. When the second phototransistor T2 is in the off state, the collector of the second phototransistor T2 outputs the high-level signal provided by the first voltage source 30. At the same time, the second pull-up module 23 can also play a current limiting role to prevent the first voltage source 30 from providing too much current to the second phototransistor T2, thereby protecting the second phototransistor T2 from damage due to overcurrent. Among them, the second pull-up module 23 may include at least one resistor, and when including multiple resistors, each resistor may be connected in series or in parallel, or in combination of series and parallel. The embodiment of the utility model does not specifically limit the number and circuit structure of the resistors in the second pull-up module 23, as long as they can perform the corresponding functions. In an optional embodiment, the second pull-up module 23 may include a fifth resistor R5.

[0096] Optional, Figure 3This is a schematic diagram of the structure of a first voltage source provided by an embodiment of the present utility model. Figure 1 and Figure 3 As shown, the first voltage source 30 includes: an isolated power supply chip 31; the input terminal VIN3 of the isolated power supply chip 31 is electrically connected to the second voltage source 40, the output terminal VOUT3 of the isolated power supply chip 31 is electrically connected to the first power supply terminal V11 of the first conversion circuit 10, and is electrically connected to the second power supply terminal V22 of the second conversion circuit 20; the input ground terminal GND01 of the isolated power supply chip 31 is electrically connected to the first ground terminal GND1, and the output ground terminal GND02 of the isolated power supply chip is electrically connected to the second ground terminal GND2.

[0097] Specifically, the input terminal VIN3 of the isolated power supply chip 31 is electrically connected to the second voltage source 40, so that the isolated power supply chip 31 can output a first voltage signal according to the second voltage signal provided by the second voltage source 40. For example, the isolated power supply chip 31 can step down the second voltage signal, and the output first voltage signal is the stepped-down voltage signal. In addition, the input ground terminal GND01 of the isolated power supply chip 31 is electrically connected to the first ground terminal GND1, and the output ground terminal GND02 is electrically connected to the second ground terminal GND2, thereby ensuring the electrical isolation between the input and output terminals of the isolated power supply chip 31, which can effectively protect the circuit from adverse effects such as high current and high voltage, and also avoid mutual interference between the input circuit and the output circuit. Among them, the second voltage signal provided by the second voltage source 40 can be 5V, and the first voltage signal output by the first voltage source 30 can be 3.3V.

[0098] In another feasible embodiment, the first voltage source 30 may include multiple isolated power supply chips, for example, an isolated power supply chip capable of converting 5V voltage into 4V, and an isolated power supply chip capable of converting 5V voltage into 2.4V, etc., so as to provide a voltage source for two-wire serial port devices and single-wire serial port devices and other related circuits. The embodiment of the present utility model does not make specific limitations on this.

[0099] In another feasible embodiment, the second voltage source 40 may be configured to include multiple isolated power supply chips to be able to output a voltage source with multiple voltage values, for example, it may output voltage signals such as 5V and 4V to achieve diversified voltage source output.

[0100] Optional, reference Figure 3 The first voltage source 30 further includes: a first filtering module 32; the first filtering module 32 is electrically connected to the second voltage source 40 and the input terminal VIN3 of the isolation power chip 31 respectively.

[0101] Specifically, a first filtering module 32 can be set between the input terminal VIN3 of the isolated power chip 31 and the second voltage source 40 to filter the second voltage signal provided by the second voltage source 40 to the isolated power chip 31, thereby preventing noise from affecting the performance of the isolated power chip 31.

[0102] Exemplarily, the first filtering module 32 includes a first capacitor C1, a second capacitor C2, and an inductor L1. The first end of the first capacitor C1 is electrically connected to the first end of the inductor L1 and the input terminal VIN3 of the isolated power supply chip 31, and the second end of the first capacitor C1 is electrically connected to the first ground terminal GND1. The first end of the second capacitor C2 is electrically connected to the second voltage source 40 and the second end of the inductor L1, and the second end of the second capacitor C2 is electrically connected to the first ground terminal GND1. The first capacitor C1, the second capacitor C2, and the inductor L1 constitute a filtering circuit for filtering, which can filter out low-frequency clutter signals in the second voltage signal.

[0103] Optional, continue to refer to Figure 3 The first voltage source 30 further includes: a second filtering module 33; the second filtering module 33 is electrically connected to the output terminal VOUT3 of the isolation power chip 31, the first power terminal V11 of the first conversion circuit 10 and the second power terminal V22 of the second conversion circuit 20 respectively.

[0104] Specifically, a second filtering module 33 may be provided at the output terminal VOUT3 of the isolated power chip 31 to filter the first voltage signal output by the isolated power chip 31 to prevent clutter from affecting the performance of the first conversion circuit 10 and the second conversion circuit 20 .

[0105] Exemplarily, the second filtering module 33 includes a third capacitor C3 and a fourth capacitor C4, the first ends of the third capacitor C3 and the fourth capacitor C4 are electrically connected to the output end VOUT3 of the isolation power supply chip 31, and the second ends of the third capacitor C3 and the fourth capacitor C4 are electrically connected to the second ground end GND2.

[0106] Among them, since the first power supply terminal V11 of the first conversion circuit 10 is the input-side power supply electrically connected to the first conversion circuit 10 and the two-wire serial port device A1; the second power supply terminal V22 of the second conversion circuit 20 is the output-side power supply electrically connected to the two-wire serial port device A1, the output terminal of the second filtering module 33 can be set to be electrically connected to the first power supply terminal V11 of the first conversion circuit 10 and to the second power supply terminal V22 of the second conversion circuit 20, which can reduce the setting of voltage sources and simplify the circuit structure.

[0107] Based on the same utility model concept, the embodiment of the utility model further provides a communication device, Figure 4 This is a schematic diagram of the structure of a communication device provided by an embodiment of the present utility model. Figure 4 As shown, the communication device 100 includes a two-wire serial port device A1, a single-wire serial port device A2 and a communication circuit A0 provided by any embodiment of the present invention. Therefore, the communication device provided by the embodiment of the present invention includes the technical features of the communication circuit provided by any embodiment of the present invention, and can achieve the beneficial effects of the communication circuit provided by any embodiment of the present invention. The similarities can be referred to the above description of the communication circuit provided by the embodiment of the present invention, and will not be repeated here.

[0108] Optional, reference Figure 4 and Figure 5 The single-wire serial port device A2 includes a motor driving circuit 50; a communication terminal of the motor driving circuit 50 is electrically connected to the signal output terminal VOUT1 of the first conversion circuit 10 and the signal input terminal VIN2 of the second conversion circuit 20; and a current output terminal of the motor driving circuit 50 is electrically connected to the motor.

[0109] Specifically, in an embodiment of the present invention, a single-line serial port device A2 can be set to include a motor drive circuit 50. During the process of driving the motor, communication between the motor drive circuit and the two-line serial port device is realized through the communication circuit provided in the above embodiment to achieve reliable driving of the motor.

[0110] Optional, Figure 5 This is a schematic diagram of the structure of a motor drive circuit provided by an embodiment of the present utility model. Figure 5 As shown, the motor drive circuit 50 includes a driver chip 51. In this embodiment, the driver chip 51 can be a TMC2226. Port PDN_UART of the driver chip 51 is a communication terminal TR, electrically connected to the signal output terminal of the first conversion circuit 10 and the signal input terminal of the second conversion circuit 20. Ports OA2 and OA1 of the driver chip 51 can be electrically connected to the positive input terminal and negative input terminal of the A phase of the two-phase stepper motor, respectively. Ports OB2 and OB1 of the driver chip 51 can be electrically connected to the positive input terminal and negative input terminal of the B phase of the two-phase stepper motor, respectively.

[0111] Optional, reference Figure 5 The motor driving circuit 50 further includes: a power signal filtering module 52; the power signal filtering module 52 is electrically connected between the external power supply (VCC1 and VCC2) and the power supply terminals (VS1, VS2 and VCC_IO) of the driving chip 51.

[0112] Specifically, the power signal filtering module 52 is used to filter the power signal provided by the external power supply to the power supply terminal of the driver chip 51. Exemplarily, the power signal filtering module 52 may include a fifth capacitor C5, a sixth capacitor C6, and a seventh capacitor C7. The power supply terminals VS1 and VS2 of the driver chip 51 are electrically connected to the external power supply VCC1, and the power supply terminals VS1 and VS2 are also grounded through the fifth capacitor C5 and the sixth capacitor C6 connected in parallel. The power supply terminal VCC_IO is electrically connected to the external power supply VCC2, and the power supply terminal VCC_IO is also grounded through the seventh capacitor C7. Among them, the external power supply VCC1 can be 24V, and the external power supply VCC2 can be 5V. In a feasible embodiment, the external power supply VCC2 can reuse the second voltage source 40.

[0113] Optional, continue to refer to Figure 5 The motor drive circuit 50 further includes a charge pump module 53; the charge pump module 53 is electrically connected to the charge pump terminals (CPO, CPI, VCP) of the driver chip 51. The charge pump module 53 may include an eighth capacitor C8 and a ninth capacitor C9. The eighth capacitor C8 is electrically connected between the charge pump terminals CPO and CPI. The charge pump terminal VCP is electrically connected to the external power supply VCC1 via the ninth capacitor C9.

[0114] Optional, continue to refer to Figure 5 The motor driving circuit 50 further includes an output voltage filter module 54, which is electrically connected between the voltage output terminal VOUT4 and the ground terminal GND2 of the driving chip 51. For example, the output voltage filter module 54 may include a tenth capacitor C10.

[0115] Optional, continue to refer to Figure 5 The motor driving circuit 50 further includes a voltage dividing module 55 ; the voltage dividing module 55 is electrically connected between the voltage output terminal VOUT4 of the driving chip 51 and the reference voltage terminal VREF of the driving chip 51 .

[0116] Specifically, the voltage divider module 55 is used to divide the voltage signal output from the voltage output terminal VOUT4 of the driver chip 51 and provide the divided voltage signal to the reference voltage terminal VREF of the driver chip 51. Exemplarily, the voltage divider module 55 includes a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. The sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are sequentially connected in series between the ground terminal GND2 and the voltage output terminal VOUT4 of the driver chip 51. The reference voltage terminal VREF of the driver chip 51 is electrically connected to the connection node between the sixth resistor R6 and the seventh resistor R7. Assuming that the voltage output from the voltage output terminal VOUT4 of the driver chip 51 is vout4, the voltage provided to the reference voltage terminal VREF of the driver chip 51 is vout4*r6 / (r6+r7+r8), where r6 is the resistance value of the sixth resistor R6, r7 is the resistance value of the seventh resistor R7, and r8 is the resistance value of the eighth resistor R8.

[0117] The voltage dividing module 55 may include an eleventh capacitor C11 connected in parallel with the sixth resistor R6 , and configured to filter the voltage signal provided to the reference voltage terminal VREF of the driver chip 51 .

[0118] Optional, continue to refer to Figure 5 The motor driving circuit 50 further includes: a first pull-down module 56; the driving chip 51 further includes a power regulator (not shown in the figure); the first pull-down module 56 is electrically connected between the power regulator and the ground terminal GND2.

[0119] Specifically, the power regulator is electrically connected to the first pull-down module 56 via the power regulation terminal STDBY, so that the power regulator can be pulled down to ground via the first pull-down module 56, thereby enabling the power regulator to operate normally.

[0120] Optionally, the motor driving circuit 50 further includes: a second pull-down module 57; the driving chip 51 further includes a chopper (not shown in the figure); the second pull-down module 57 is electrically connected between the chopper and the ground terminal GND2.

[0121] Specifically, the chopper can be electrically connected to the second pull-down module 57 via the chopper mode selection terminal SPREAD, so that the chopper can be pulled down to ground via the second pull-down module 57, thereby setting the chopper's operating mode to a silent chopping mode (StealthChop). The second pull-down module 57 can include a tenth resistor R10.

[0122] Optionally, the motor drive circuit 50 further includes a current detection module 58, which can be electrically connected between the current detection terminals (BRA and BRB) and the ground terminal GND2. For detecting the A-phase current and the B-phase current of the motor. The current detection module 58 may include an eleventh resistor R11 and a twelfth resistor R12, the eleventh resistor R11 being electrically connected between the current detection terminal BRA and the ground terminal GND2 for detecting the A-phase current of the motor, and the twelfth resistor R12 being electrically connected between the current detection terminal BRB and the ground terminal GND2 for detecting the B-phase current of the motor.

[0123] In addition, the ground terminals GND03 and GND04 of the driver chip 51 are grounded, the port PPAD and the port CLK are grounded, and other ports (such as ports STEP, ENN, DIR, MS1, MS2, DIAG, INDEX and NC) can be left floating. In other feasible embodiments, the circuits of each port can also be set according to functional requirements.

[0124] Optionally, the two-wire serial port device A1 includes a single-chip microcomputer, which can send signals to the single-wire serial port device A2 (for example, a motor drive circuit) through the first conversion circuit 10, and can also receive signals from the single-wire serial port device A2 through the second conversion circuit 20 to realize status monitoring and control of the motor operation.

[0125] The ground terminals electrically connected to the motor driving circuit may all be the second ground terminal GND2, so as to be electrically isolated from the two-wire serial port device.

[0126] Based on the same utility model concept, the embodiment of the present invention further provides a sequencing system, including the communication circuit provided by any embodiment of the present invention, or the communication device provided by any embodiment of the present invention. Therefore, the communication device provided by the embodiment of the present invention includes the technical features of the communication circuit provided by any embodiment of the present invention, and can achieve the beneficial effects of the communication circuit provided by any embodiment of the present invention, or the communication device provided by the embodiment of the present invention includes the technical features of the communication device provided by any embodiment of the present invention, and can achieve the beneficial effects of the communication device provided by any embodiment of the present invention. The similarities can be referred to the above description of the communication circuit or communication device provided by the embodiment of the present invention, and will not be repeated here.

[0127] Among them, sequencing systems are analytical instruments used in the fields of biology, basic medicine, and clinical medicine, and can detect the nucleotide composition and nucleotide sequence of nucleic acid molecules.

[0128] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A communication circuit electrically connected between a two-wire serial port device and a single-wire serial port device, characterized in that: The communication circuit includes: a first conversion circuit, a second conversion circuit and a first voltage source; The first power supply terminal and the second power supply terminal of the first conversion circuit are electrically connected to the first voltage source and the second voltage source respectively, and the signal input terminal and the signal output terminal of the first conversion circuit are electrically connected to the signal output terminal of the two-wire serial port device and the communication terminal of the single-wire serial port device respectively; The first power supply terminal and the second power supply terminal of the second conversion circuit are electrically connected to the second voltage source and the first voltage source respectively, and the signal input terminal and the signal output terminal of the second conversion circuit are electrically connected to the communication terminal of the single-wire serial port device and the signal input terminal of the dual-wire serial port device respectively; The voltage signals output by the first voltage source and the second voltage source are different.

2. The communication circuit according to claim 1, wherein: The first conversion circuit includes: a first optocoupler; the input side power supply terminal of the first optocoupler is electrically connected to the first voltage source, the signal input terminal of the first optocoupler is electrically connected to the signal output terminal of the two-wire serial port device; the signal output terminal of the first optocoupler is electrically connected to the second voltage source and the communication terminal of the single-wire serial port device.

3. The communication circuit according to claim 2, wherein: The first optocoupler includes a first light-emitting diode, a first phototransistor and a first diode; the anode of the first light-emitting diode is electrically connected to the first voltage source, and the cathode of the first light-emitting diode is electrically connected to the signal output end of the two-wire serial port device; the cathode of the first diode is electrically connected to the second voltage source, and the anode of the first diode is electrically connected to the base of the first phototransistor; the collector of the first phototransistor is electrically connected to the second voltage source and the communication end of the single-wire serial port device, and the emitter of the first phototransistor is electrically connected to the first ground end.

4. The communication circuit according to claim 2, wherein: The first conversion circuit further includes: a first current limiting module; the first current limiting module is electrically connected between the first voltage source and the input side power supply terminal of the first optocoupler.

5. The communication circuit according to claim 2, wherein: The first conversion circuit further includes: a first pull-up module; A first end of the first pull-up module is electrically connected to the second voltage source, and a second end of the first pull-up module is electrically connected to the signal output end of the first optocoupler.

6. The communication circuit according to claim 2, wherein: The first conversion circuit further includes: a second current limiting module; A first end of the second current limiting module is electrically connected to the signal output end of the first optical coupler, and a second end of the second current limiting module is electrically connected to the communication end of the single-wire serial port device.

7. The communication circuit according to claim 1, wherein: The second conversion circuit includes: a second optocoupler; the input side power supply terminal of the second optocoupler is electrically connected to the second voltage source, the signal input terminal of the second optocoupler is electrically connected to the communication terminal of the single-wire serial port device; the signal output terminal of the second optocoupler is electrically connected to the first voltage source and the signal input terminal of the two-wire serial port device.

8. The communication circuit according to claim 7, wherein: The second optocoupler includes a second light-emitting diode, a second phototransistor and a second diode; the anode of the second light-emitting diode is electrically connected to the second voltage source, and the cathode of the second light-emitting diode is electrically connected to the communication end of the single-wire serial port device; the cathode of the second diode is electrically connected to the first voltage source, and the anode of the second diode is electrically connected to the base of the second phototransistor; the collector of the second phototransistor is electrically connected to the first voltage source and the signal input end of the two-wire serial port device, and the emitter of the second phototransistor is electrically connected to the second ground end.

9. The communication circuit according to claim 7, wherein: The second conversion circuit further includes: a third current limiting module; the third current limiting module is electrically connected between the second voltage source and the input side power supply terminal of the second optocoupler.

10. The communication circuit according to claim 7, wherein: The second conversion circuit further includes: a second pull-up module; A first end of the second pull-up module is electrically connected to the first voltage source, and a second end of the second pull-up module is electrically connected to the signal output end of the second optocoupler.

11. The communication circuit according to claim 1, wherein: The first voltage source includes: an isolated power supply chip; the input end of the isolated power supply chip is electrically connected to the second voltage source, the output end of the isolated power supply chip is electrically connected to the first power supply end of the first conversion circuit, and is electrically connected to the second power supply end of the second conversion circuit; the input ground end of the isolated power supply chip is electrically connected to the first ground end, and the output ground end of the isolated power supply chip is electrically connected to the second ground end.

12. The communication circuit according to claim 11, wherein: The first voltage source further includes: a first filtering module; the first filtering module is electrically connected to the second voltage source and the input end of the isolation power supply chip respectively.

13. The communication circuit according to claim 11, wherein: The first voltage source further includes: a second filtering module; the second filtering module is electrically connected to the output end of the isolation power supply chip, the first power supply end of the first conversion circuit, and the second power supply end of the second conversion circuit respectively.

14. A communication device, characterized in that: The invention comprises a dual-wire serial port device, a single-wire serial port device and a communication circuit as claimed in any one of claims 1 to 13.

15. The communication device according to claim 14, wherein: The single-wire serial port device includes a motor drive circuit; a communication end of the motor drive circuit is electrically connected to a signal output end of the first conversion circuit and a signal input end of the second conversion circuit; and a current output end of the motor drive circuit is electrically connected to the motor. The communication device according to claim 14 , wherein: The two-wire serial port device includes a single-chip microcomputer.

17. The communication device according to claim 15, characterized in that The motor driving circuit includes: a driving chip.

18. The communication device according to claim 17, wherein: The motor driving circuit further includes: a power signal filtering module; the power signal filtering module is electrically connected between an external power supply and a power terminal of the driving chip.

19. The communication device according to claim 17, wherein: The motor driving circuit further includes: a charge pump module; the charge pump module is electrically connected to the charge pump terminal of the driving chip.

20. The communication device according to claim 17, wherein: The motor driving circuit further includes: an output voltage filtering module; the output voltage filtering module is electrically connected between the voltage output terminal of the driving chip and the ground terminal.

21. The communication device according to claim 17, characterized in that Optionally, the motor driving circuit further includes: a voltage dividing module; the voltage dividing module is electrically connected between the voltage output terminal of the driving chip and the voltage output terminal reference voltage terminal of the driving chip.

22. The communication device according to claim 17, wherein: The motor driving circuit further includes: a first pull-down module; the driving chip further includes a power regulator; the first pull-down module is electrically connected between the power regulator and the ground terminal.

23. The communication device according to claim 17, wherein: The motor driving circuit further includes: a second pull-down module; the driving chip further includes a chopper; the second pull-down module is electrically connected between the chopper and the ground terminal.

24. A sequencing system, characterized in that The communication circuit comprises the communication circuit according to any one of claims 1 to 13, or the communication device according to any one of claims 14 to 23.

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