CAN photoelectric transceiver based on optical power supply

Abstract

The utility model discloses a CAN photoelectric transceiving device based on optical power supply, which comprises a transmitting end and a receiving end, and is characterized in that the transmitting end comprises a constant current source module, a first energy supply module and a signal transmitting module, and the constant current source module is electrically connected with the first energy supply module; the receiving end comprises a second energy supply module and a signal receiving module; the first energy supply module and the second energy supply module are connected through a first optical fiber; the signal transmitting module is connected with the signal receiving module through a second optical fiber; the transmitting end is provided with a first interface and a second interface, the constant current source module and the signal transmitting module are electrically connected with the first interface, and the signal transmitting module is electrically connected with the second interface; the receiving end is provided with a third interface, and the signal receiving module is electrically connected with the third interface. Compared with the prior art, energy supply and independent transmission of signals can be realized, the transmission distance is increased, and the anti-electromagnetic interference is enhanced, so that the transmission quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of photoelectric conversion, and in particular relates to a CAN photoelectric transceiver device based on optical power supply. Background Art

[0002] Transmission distance and anti-electromagnetic interference degree are important factors affecting the quality of communication transmission. The use of CAN / CANFD / LIN photoelectric transceivers can increase the transmission distance and enhance the anti-electromagnetic interference, thereby improving the transmission quality. The photoelectric transceivers in the prior art are powered by external DC power supply or internal lithium battery.

[0003] For example, the publication number is "JPH0376167A", and the patent name is "Photoelectric converter, optical transceiver using photoelectric converter, optical transmitter and optical communication device". The photoelectric transceiver in this solution uses external DC power supply, which will cause EMC radiation problems. For example, the publication number is "CN107284557A", and the patent name is "A portable anti-theft device integrating energy storage and energy conversion control". The photoelectric transceiver in this solution is powered by batteries, and battery power supply requires frequent charging of the device, which wastes time, and frequent plugging and unplugging of communication optical fibers can easily damage the connectors. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a CAN optoelectronic transceiver based on optical power supply, aiming to solve the problem in the prior art that external DC power supply will cause EMC radiation, and the use of internal lithium battery power supply requires frequent charging of the device, which wastes time, and frequent plugging and unplugging of communication optical fibers also easily damages the connectors.

[0005] The utility model is implemented by the following technical solutions:

[0006] A CAN optoelectronic transceiver device based on optical power supply comprises a transmitting end and a receiving end, wherein the transmitting end comprises a constant current source module, a first energy supply module and a signal transmitting module, and the constant current source module is electrically connected to the first energy supply module; the receiving end comprises a second energy supply module and a signal receiving module; the first energy supply module and the second energy supply module are connected via a first optical fiber; the signal transmitting module and the signal receiving module are connected via a second optical fiber; the transmitting end is provided with a first interface and a second interface, the constant current source module and the signal transmitting module are electrically connected to the first interface, and the signal transmitting module is electrically connected to the second interface; the receiving end is provided with a third interface, and the signal receiving module is electrically connected to the third interface.

[0007] To optimize the above technical solutions, the specific measures taken also include:

[0008] Furthermore, the first interface is a DC power interface, and the second interface and the third interface are both DB9 serial interfaces.

[0009] Furthermore, the signal transmission module includes an analog interface DSUB1 and a CAN signal transmission unit which are electrically connected.

[0010] Furthermore, the constant current source module includes a constant voltage circuit, a sampling resistor R4, an operational amplifier circuit and a regulating circuit which are electrically connected in sequence;

[0011] The constant voltage circuit includes a constant voltage chip U1, a resistor R3, an LED1, an LED2, an LED3, a resistor R2, a capacitor C2, a resistor R8, a resistor R9, a resistor R10, and a resistor R5. Pin 1 of the constant voltage chip U1 is connected to LED3 and capacitor C2, pin 2 of the constant voltage chip U1 is connected to the sliding end of the sliding resistor R2, capacitor C2, and resistor R8, pin 3 of the constant voltage chip U1 is connected to pin 6 of the constant voltage chip U1, pin 4 of the constant voltage chip U1 is grounded, pin 5 of the constant voltage chip U1 is connected to resistors R8 and R9, pin 7 of the constant voltage chip U1 is connected to LED1 and LED2, pin 8 of the constant voltage chip U1 is connected to resistor R3, resistors R9 and R10 are both grounded, resistor R10 is connected to LED2, a fixed end on one side of the sliding resistor R2 is connected to resistor R5, and a fixed end on the other side of the sliding resistor R2 is grounded;

[0012] The operational amplifier circuit includes a dual operational amplifier U3, a resistor R7, a capacitor C3, a capacitor C4, a capacitor C5, an inductor L1, a unidirectional diode D1, a capacitor C6, a capacitor C7, and a resistor R11. Pin 1 of the dual operational amplifier U3 is grounded, pin 2 of the dual operational amplifier U3 is connected to a fixed end on one side of a sampling resistor R4, both ends of the resistor R7 are respectively connected to pin 1 and pin 2 of the dual operational amplifier U3, pin 4 of the dual operational amplifier U3 is connected to capacitor C3, and pin 5 of the dual operational amplifier U3 is connected to capacitor C3, capacitor C4, and resistor R11. The capacitor C5 is connected in series, the 3rd pin of the dual operational amplifier U3 is connected in parallel with the 6th pin of the dual operational amplifier U3, the unidirectional diode D1 is connected in series with the 3rd pin and the 6th pin of the dual operational amplifier U3, the inductor L1 is connected in series with the 3rd pin and the 6th pin of the dual operational amplifier U3, one end of the capacitor C6 is connected to the fixed end of the sampling resistor R4, the other end of the capacitor C6 is connected in series with the unidirectional diode D1, the capacitor C7 and the resistor R11, the capacitor C6, the unidirectional diode D1, the capacitor C7 and the resistor R11 are grounded, and the resistor R11 is connected to the 6th pin of the constant voltage chip U1;

[0013] The regulating circuit includes a regulating chip U2, a resistor R1, a resistor R6, a capacitor C1, and a capacitor C5. Pin 1 of the regulating chip U2 is connected in series with the resistor R1 and the resistor R6. Pin 2 of the regulating chip U2 is connected in series with the capacitor C1 and the resistor R6. Pin 3 of the regulating chip U2 is connected with the capacitor C5, the capacitor C4, the capacitor C3, and the pin 5 of the dual operational amplifier U3. The capacitor C5 is grounded.

[0014] Further, the CAN signal transmitting unit includes an electrostatic and overvoltage protection circuit 1, a common mode interference suppression circuit 1, a conversion circuit 1 between a differential signal and a TTL level, a resistor R16, an inverting circuit 1, a photoelectric coupling circuit 1, a signal laser transmitting circuit 1, and a signal amplifying circuit 1, which are electrically connected in sequence. The electrostatic and overvoltage protection circuit 1 is connected to the analog interface DSUB1, the signal amplifying circuit 1 is arranged between the signal laser transmitting circuit 1 and the inverting circuit 1, and the electrostatic and overvoltage protection circuit 1 is connected to the analog interface DSUB1;

[0015] The electrostatic and overvoltage protection circuit 1 includes a gas discharge tube GDT1, a gas discharge tube GDT2, and an ESD device D2. Pin 2 of the gas discharge tube GDT1 is connected to pin 7 of the analog interface DSUB1, pin 2 of the gas discharge tube GDT2 is connected to pin 2 of the analog interface DSUB1, pin 1 of the ESD device D2 is connected to pin 2 of the gas discharge tube GDT1 and pin 7 of the analog interface DSUB1, and pin 2 of the ESD device D2 is connected to pin 2 of the gas discharge tube GDT2 and pin 2 of the analog interface DSUB1;

[0016] The common mode interference suppression circuit 1 includes an inductor L2 and an inductor L3, wherein the 4th pin of the inductor L3 is connected to the 1st pin of the ESD device D2, the 3rd pin of the inductor L3 is connected to the 2nd pin of the ESD device D2, the 1st pin of the inductor L3 is connected to the 4th pin of the inductor L2, and the 2nd pin of the inductor L3 is connected to the 3rd pin of the inductor L2;

[0017] The conversion circuit between the differential signal and the TTL level includes a CAN transceiver chip U6, a resistor R15, a resistor R17, a capacitor C13, and a capacitor C11. Pin 7 of the CAN transceiver chip U6 is connected to pin 1 of the inductor L2, pin 6 of the CAN transceiver chip U6 is connected to pin 2 of the inductor L2, pin 2 of the CAN transceiver chip U6 is grounded, pin 3 of the CAN transceiver chip U6 is connected to the power supply voltage, pin 4 of the CAN transceiver chip U6 is respectively connected to the resistor R16 and the resistor R17, the resistor R17 is connected to the power supply voltage, one end of the capacitor C13 is respectively connected to the resistor R17 and the power supply voltage, the other end of the capacitor C13 is grounded, one end of the capacitor C11 is connected to pin 5 of the CAN transceiver chip U6, and the other end of the capacitor C11 is grounded; the two ends of the resistor R15 are respectively connected to pin 8 and pin 2 of the CAN transceiver chip U6;

[0018] The inverter circuit 1 includes an inverter U7 and a capacitor C12, wherein the pin 14 of the inverter U7 is connected to the capacitor C12 and the supply voltage, the pin 7 of the inverter U7 is grounded, the pin 9 of the inverter U7 is connected to the resistor R16, the capacitor C12 is grounded, the pin 2 and the pin 3 of the inverter U7 are connected, the pin 4 and the pin 5 of the inverter U7 are connected, and the pin 6 and the pin 13 of the inverter U7 are connected;

[0019] The photoelectric coupling circuit 1 includes a photoelectric coupler U4, a resistor R12, a resistor R13, a resistor R14, and a capacitor C8, wherein the pin 2 of the photoelectric coupler U4 is connected to the pin 8 of the inverter U7, the pin 3 of the photoelectric coupler U4 is connected to the pin 2 of the photoelectric coupler U4, the pin 3 of the photoelectric coupler U4 is connected to the resistor R12, the resistor R12 is grounded, the pin 5 of the photoelectric coupler U4 is grounded, the pin 6 of the photoelectric coupler U4 is connected to the resistor R13, the pin 6 of the photoelectric coupler U4 is connected to the pin 7 of the photoelectric coupler U4, the pin 7 of the photoelectric coupler U4 is connected to the pin 12 of the inverter U7, the pin 8 of the photoelectric coupler U4 is respectively connected to the capacitor C8 and the supply voltage, the capacitor C8 is grounded, and the resistor R14 is respectively connected to the pin 6 and the pin 8 of the photoelectric coupler U4;

[0020] The signal laser transmitting circuit 1 includes a signal laser U5, a capacitor C9 and a capacitor C10, the pins 1 and 9 of the signal laser U5 are grounded, the pin 8 of the signal laser U5 is connected to the resistor R13, the pin 6 of the signal laser U5 is respectively connected to the capacitor C9 and the power supply voltage, the pin 5 of the signal laser U5 is respectively connected to the capacitor C10 and the power supply voltage, the capacitor C9 and the capacitor C10 are both grounded, and the pin 2 of the signal laser U5 is connected to the resistor R18;

[0021] The signal amplifying circuit 1 includes a resistor R20, a capacitor C14, a transistor Q1, a transistor Q2, a resistor R22, a resistor R19 and a resistor R21. One end of the resistor R20 is connected to pin 2 of the signal laser U5, and the other end of the resistor R20 is respectively connected in series with the capacitor C14 and the base of the transistor Q1. The collector of the transistor Q1 is connected in series with pin 5 of the signal laser U5, the capacitor C10 and the collector of the transistor Q2. The emitter of the transistor Q1 is respectively connected in series with the resistor R22 and the resistor R19. The resistor R22 is grounded. The resistor R19 is connected to the base of the transistor Q2. The emitter of the transistor Q2 is respectively connected in series with the resistor R21 and pin 1 of the inverter U7. The resistor R21 is grounded.

[0022] Further, the signal transmission module also includes a transceiver indicator light circuit, which includes a resistor R29, a resistor R32, a transistor Q5 and a transistor Q7, a resistor R30, a resistor R24, a resistor R25, a transistor Q3, a transistor Q4, a transistor Q6, a resistor R33, a resistor R34, a resistor R35, a resistor R26, a resistor R27, a resistor R28, a resistor R23, a resistor R24, an LED4, and an LED5;

[0023] The resistor R29 is connected to pin 8 of the signal laser U5, the resistor R32 is connected to pin 2 of the signal laser U5, the base of the transistor Q5 is connected to the resistor R29, the collector of the transistor Q5 is connected to the resistor R30 and the base of the transistor Q4, the emitter of the transistor Q5 is connected to the emitters of the transistors Q3, Q4 and Q6, the base of the transistor Q7 is connected to the resistor R32, the collector of the transistor Q7 is connected to the resistor R31 and the base of the transistor Q6, the emitter of the transistor Q7 is connected to the emitters of the transistors Q3, Q4 and Q6, and the resistor R30 is connected in series with the resistor R31 The power supply voltage is connected in parallel, the resistor R25 is connected to the base of the transistor Q3, the collector of the transistor Q3 is connected to the resistor R23, the resistor R25 is connected to the resistor R24, the resistor R24 ​​is connected to LED4, the resistor R23 is connected to pin 1 of LED4, the collector of the transistor Q4 is respectively connected in series with the resistor R26, the resistor R27, and the resistor R28, the resistor R26, the resistor R27, and the resistor R28 are all connected in series with pin 1 of LED5, the collector of the transistor Q6 is respectively connected in series with the resistor R33, the resistor R34, and the resistor R35, the resistor R33, the resistor R34, and the resistor R35 are all connected in series with pin 2 of LED5.

[0024] Furthermore, the first energy supply module adopts an energy supply laser, and the second energy supply module adopts an energy supply photocell.

[0025] Furthermore, the first optical fiber is a power supply optical fiber, and the second optical fiber is a signal optical fiber.

[0026] Further, the signal receiving module includes an analog interface DSUB3 and a CAN signal receiving unit that are electrically connected, and the CAN signal receiving unit includes an electrostatic and overvoltage protection circuit 2, a common mode interference suppression circuit 2, a differential signal and TTL level conversion circuit 2, a resistor R57, an inverting circuit 2, a photoelectric coupling circuit 2, a signal laser transmitting circuit 2, and a signal amplifying circuit 2 that are electrically connected in sequence, the electrostatic and overvoltage protection circuit 2 is connected to the analog interface DSUB3, the signal amplifying circuit 2 is arranged between the signal laser transmitting circuit 2 and the inverting circuit 2, and the electrostatic and overvoltage protection circuit 2 is connected to the analog interface DSUB3;

[0027] The second static and overvoltage protection circuit comprises a gas discharge tube GDT4, a gas discharge tube GDT5, and an ESD device D7. Pin 2 of the gas discharge tube GDT4 is connected to pin 7 of the analog interface DSUB3, pin 2 of the gas discharge tube GDT5 is connected to pin 2 of the analog interface DSUB3, pin 1 of the ESD device D7 is connected to pin 2 of the gas discharge tube GDT4 and pin 7 of the analog interface DSUB3, and pin 2 of the ESD device D7 is connected to pin 2 of the gas discharge tube GDT5 and pin 2 of the analog interface DSUB3;

[0028] The second common mode interference suppression circuit includes an inductor L9 and an inductor L8, wherein the pin 4 of the inductor L9 is connected to the pin 1 of the ESD device D7, the pin 3 of the inductor L9 is connected to the pin 2 of the ESD device D7, the pin 1 of the inductor L9 is connected to the pin 4 of the inductor L8, and the pin 2 of the inductor L9 is connected to the pin 3 of the inductor L8;

[0029] The second conversion circuit between the differential signal and the TTL level includes a CAN transceiver chip U15, a resistor R56, a resistor R58, a capacitor C36, and a capacitor C34. Pin 7 of the CAN transceiver chip U15 is connected to pin 1 of the inductor L8, pin 6 of the CAN transceiver chip U15 is connected to pin 2 of the inductor L8, pin 2 of the CAN transceiver chip U15 is grounded, pin 3 of the CAN transceiver chip U15 is connected to the power supply voltage, pin 4 of the CAN transceiver chip U15 is respectively connected to resistor R57 and resistor R58, the resistor R58 is connected to the power supply voltage, one end of the capacitor C36 is respectively connected to resistor R58 and the power supply voltage, the other end of the capacitor C36 is grounded, one end of the capacitor C34 is connected to pin 5 of the CAN transceiver chip U15, and the other end of the capacitor C34 is grounded; both ends of the resistor R56 are respectively connected to the CAN Connect pin 8 and pin 2 of transceiver chip U15;

[0030] The second inverter circuit includes an inverter U16 and a capacitor C35, wherein the pin 14 of the inverter U16 is connected to the capacitor C35 and the power supply voltage, the pin 7 of the inverter U16 is grounded, the pin 9 of the inverter U16 is connected to the resistor R57, the capacitor C35 is grounded, the pin 2 of the inverter U16 is connected to the pin 3, the pin 4 of the inverter U16 is connected to the pin 5, and the pin 6 of the inverter U16 is connected to the pin 13; the first photoelectric coupling circuit includes a photoelectric coupler U13, a resistor R53, a resistor R54, a resistor R55, and a capacitor C31, the pin 2 of the photoelectric coupler U13 is connected to the pin 8 of the inverter U16, the pin 3 of the photoelectric coupler U13 is connected to the pin 2 of the photoelectric coupler U13, and the pin 3 of the photoelectric coupler U13 is connected to the resistor R53. The resistor R53 is grounded, the 5th pin of the photoelectric coupler U13 is grounded, the 6th pin of the photoelectric coupler U13 is connected to the resistor R54, the 6th pin of the photoelectric coupler U13 is connected to the 7th pin of the photoelectric coupler U13, the 7th pin of the photoelectric coupler U13 is connected to the 12th pin of the inverter U16, the 8th pin of the photoelectric coupler U13 is respectively connected to the capacitor C31 and the power supply voltage, the capacitor C31 is grounded, and the resistor R55 is respectively connected to the 6th pin and the 8th pin of the photoelectric coupler U13;

[0031] The signal laser transmitting circuit 2 includes a signal laser U14, a capacitor C32 and a capacitor C33, wherein the pins 1 and 9 of the signal laser U14 are grounded, the pin 8 of the signal laser U14 is connected to the resistor R54, the pin 6 of the signal laser U14 is respectively connected to the capacitor C32 and the power supply voltage, the pin 5 of the signal laser U14 is respectively connected to the capacitor C33 and the power supply voltage, the capacitor C32 and the capacitor C33 are both grounded, and the pin 2 of the signal laser U14 is connected to the resistor R59;

[0032] The signal amplifying circuit 2 includes a resistor R60, a capacitor C37, a transistor Q10, a transistor Q11, a resistor R63, a resistor R61 and a resistor R62. One end of the resistor R60 is connected to pin 2 of the signal laser U14, and the other end of the resistor R60 is connected in series with the capacitor C37 and the base of the transistor Q10 respectively. The collector of the transistor Q10 is connected in series with pin 5 of the signal laser U14, the capacitor C33 and the collector of the transistor Q11. The emitter of the transistor Q10 is connected in series with the resistor R63 and the resistor R61 respectively. The resistor R63 is grounded. The resistor R61 is connected to the base of the transistor Q11. The emitter of the transistor Q11 is connected in series with the resistor R62 and pin 1 of the inverter U16 respectively. The resistor R62 is grounded.

[0033] Compared with the prior art, the CAN photoelectric transceiver device based on optical power supply of the utility model can realize independent transmission of energy supply and signal, increase the transmission distance, enhance the resistance to electromagnetic interference, and thus improve the transmission quality.

[0034] The utility model adopts an improved constant current source circuit, adopts a dual operational amplifier and a constant voltage chip, combines a sampling resistor, and reasonably sets the peripheral circuit, and finally realizes an adjustable constant current module, which can provide a stable current according to actual conditions.

[0035] The utility model adopts improved signal transmitting module and signal receiving module, both of which are based on CAN chip and carry out corresponding circuit design, which can suppress common mode interference and signal noise in CAN differential signal, ensure signal quality, and prevent external electromagnetic interference. At the same time, with the transmitting and receiving indicator light circuit, the receiving and transmitting states can be displayed intuitively. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The utility model discloses a constant current source module circuit diagram of a CAN photoelectric transceiver device based on light power supply.

[0037] Figure 2 The utility model is a circuit diagram of a signal transmitting module.

[0038] Figure 3 The utility model is a circuit diagram of a transmitting and receiving indicator light.

[0039] Figure 4 The utility model is a circuit diagram of a signal receiving module. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Reference Figure 1-Figure 4 This embodiment provides a CAN optoelectronic transceiver device based on optical power supply, including a transmitting end and a receiving end, the transmitting end provides signals and power, and the receiving end receives signals and power.

[0043] The transmitting end includes a constant current source module, a first energy supply module and a signal transmitting module, and the constant current source module is electrically connected to the first energy supply module; the receiving end includes a second energy supply module and a signal receiving module; the first energy supply module and the second energy supply module are connected through a first optical fiber; the signal transmitting module and the signal receiving module are connected through a second optical fiber; the transmitting end is provided with a first interface and a second interface, the constant current source module and the signal transmitting module are electrically connected to the first interface, and the signal transmitting module is electrically connected to the second interface; the receiving end is provided with a third interface, and the signal receiving module is electrically connected to the third interface.

[0044] The first optical fiber is a power supply optical fiber, the second optical fiber is a signal optical fiber, the first interface is a DC power interface, and the second interface and the third interface are both DB9 serial interfaces.

[0045] The first interface is used to receive an external DC voltage. In this embodiment, the DC voltage is preferably 12V. The DC voltage received by the first interface is sequentially input into the constant current source module and the first energy supply module, and then input into the second energy supply module through the first optical fiber to realize energy supply. At the same time, the DC voltage of the first interface is also responsible for powering the signal sending module. The constant current source module is used to separate the first energy supply module and the signal sending module from the first interface to avoid direct connection between the first module and the signal sending module and the first interface, thereby ensuring that the first energy supply module and the signal sending module obtain stable current. The first optical fiber and the second optical fiber are used for energy supply and signal transmission, respectively, which can maintain high-speed and stable transmission and reduce the delay rate.

[0046] There are bidirectional connections between the second interface and the signal transmitting module, and between the third interface and the signal receiving module. Signals can be sent to the signal transmitting module through the second interface, and signals in the signal transmitting module can be read through the second interface. Signals in the signal receiving module can be transmitted through the third interface, and signals sent to the signal receiving module by the third interface can be received and read, thereby realizing signal transmission and conversion.

[0047] The constant current source module includes a constant voltage circuit, a sampling resistor R4, an operational amplifier circuit and a regulating circuit which are electrically connected in sequence;

[0048] The constant voltage circuit includes a constant voltage chip U1, a resistor R3, an LED1, an LED2, an LED3, a resistor R2, a capacitor C2, a resistor R8, a resistor R9, a resistor R10, and a resistor R5. Pin 1 of the constant voltage chip U1 is connected to LED3 and capacitor C2, pin 2 of the constant voltage chip U1 is connected to the sliding end of the sliding resistor R2, capacitor C2, and resistor R8, pin 3 of the constant voltage chip U1 is connected to pin 6 of the constant voltage chip U1, pin 4 of the constant voltage chip U1 is grounded, pin 5 of the constant voltage chip U1 is connected to resistors R8 and R9, pin 7 of the constant voltage chip U1 is connected to LED1 and LED2, pin 8 of the constant voltage chip U1 is connected to resistor R3, resistors R9 and R10 are both grounded, resistor R10 is connected to LED2, a fixed end on one side of the sliding resistor R2 is connected to resistor R5, and a fixed end on the other side of the sliding resistor R2 is grounded;

[0049] The operational amplifier circuit includes a dual operational amplifier U3, a resistor R7, a capacitor C3, a capacitor C4, a capacitor C5, an inductor L1, a unidirectional diode D1, a capacitor C6, a capacitor C7, and a resistor R11. Pin 1 of the dual operational amplifier U3 is grounded, pin 2 of the dual operational amplifier U3 is connected to a fixed end on one side of the sampling resistor R4, both ends of the resistor R7 are respectively connected to pin 1 and pin 2 of the dual operational amplifier U3, pin 4 of the dual operational amplifier U3 is connected to capacitor C3, and pin 5 of the dual operational amplifier U3 is connected to capacitor C3, capacitor C4, Capacitor C5 is connected in series, pin 3 of dual operational amplifier U3 is connected in parallel with pin 6 of dual operational amplifier U3, unidirectional diode D1 is connected in series with pin 3 and pin 6 of dual operational amplifier U3, inductor L1 is connected in series with pin 3 and pin 6 of dual operational amplifier U3, one end of capacitor C6 is connected to the fixed end of sampling resistor R4, the other end of capacitor C6 is connected in series with unidirectional diode D1, capacitor C7 and resistor R11, capacitor C6, unidirectional diode D1, capacitor C7 and resistor R11 are grounded, and resistor R11 is connected to pin 6 of constant voltage chip U1;

[0050] The regulating circuit includes a regulating chip U2, a resistor R1, a resistor R6, a capacitor C1, and a capacitor C5. Pin 1 of the regulating chip U2 is connected in series with the resistor R1 and the resistor R6. Pin 2 of the regulating chip U2 is connected in series with the capacitor C1 and the resistor R6. Pin 3 of the regulating chip U2 is connected with the capacitor C5, the capacitor C4, the capacitor C3, and the pin 5 of the dual operational amplifier U3. The capacitor C5 is grounded.

[0051] In this embodiment, the circuit structure of the constant current source module is based on the constant voltage chip U1, and a dual operational amplifier U3, a sampling resistor R4 and related peripheral circuits are added. By comparing the voltage on the sampling resistor with the preset voltage, the result can be connected to the feedback pin of the constant voltage chip U1, thereby changing the constant voltage module to an adjustable constant current source module.

[0052] The signal transmitting module includes an analog interface DSUB1 and a CAN signal transmitting unit which are electrically connected. The CAN signal transmitting unit includes an electrostatic and overvoltage protection circuit 1, a common mode interference suppression circuit 1, a differential signal and TTL level conversion circuit 1, a resistor R5, an inverting circuit 1, an optocoupler circuit 1, a signal laser transmitting circuit 1, and a signal amplifying circuit 1 which are electrically connected in sequence. The electrostatic and overvoltage protection circuit 1 is connected to the analog interface DSUB1. The signal amplifying circuit 1 is arranged between the signal laser transmitting circuit 1 and the inverting circuit 1. The electrostatic and overvoltage protection circuit 1 is connected to the analog interface DSUB1.

[0053] The first electrostatic and overvoltage protection circuit includes a gas discharge tube GDT1, a gas discharge tube GDT2, and an ESD device D2. Pin 2 of the gas discharge tube GDT1 is connected to pin 7 of the analog interface DSUB1, pin 2 of the gas discharge tube GDT2 is connected to pin 2 of the analog interface DSUB1, pin 1 of the ESD device D2 is connected to pin 2 of the gas discharge tube GDT1 and pin 7 of the analog interface DSUB1, and pin 2 of the ESD device D2 is connected to pin 2 of the gas discharge tube GDT2 and pin 2 of the analog interface DSUB1;

[0054] The first common mode interference suppression circuit includes an inductor L2 and an inductor L3, wherein the 4th pin of the inductor L3 is connected to the 1st pin of the ESD device D2, the 3rd pin of the inductor L3 is connected to the 2nd pin of the ESD device D2, the 1st pin of the inductor L3 is connected to the 4th pin of the inductor L2, and the 2nd pin of the inductor L3 is connected to the 3rd pin of the inductor L2. The common mode inductors L2 and L3 are used to suppress the common mode interference in the CAN differential signal.

[0055] The conversion circuit between differential signal and TTL level includes CAN transceiver chip U6, resistor R15, resistor R17, capacitor C13, and capacitor C11. Pin 7 of CAN transceiver chip U6 is connected to pin 1 of inductor L2, pin 6 of CAN transceiver chip U6 is connected to pin 2 of inductor L2, pin 2 of CAN transceiver chip U6 is grounded, pin 3 of CAN transceiver chip U6 is connected to power supply voltage, pin 4 of CAN transceiver chip U6 is respectively connected to resistor R16 and resistor R17, resistor R17 is connected to power supply voltage, one end of capacitor C13 is respectively connected to resistor R17 and power supply voltage, the other end of capacitor C13 is grounded, one end of capacitor C11 is connected to pin 5 of CAN transceiver chip U6, and the other end of capacitor C11 is grounded; the two ends of resistor R15 are respectively connected to pin 8 and pin 2 of CAN transceiver chip U6.

[0056] Inverting circuit 1 includes inverter U7 and capacitor C12, pin 14 of inverter U7 is connected to capacitor C12 and power supply voltage, pin 7 of inverter U7 is grounded, pin 9 of inverter U7 is connected to resistor R16, capacitor C12 is grounded, pin 2 and pin 3 of inverter U7 are connected, pin 4 and pin 5 of inverter U7 are connected, and pin 6 and pin 13 of inverter U7 are connected.

[0057] The photoelectric coupling circuit 1 includes a photoelectric coupler U4, a resistor R12, a resistor R13, a resistor R14, and a capacitor C8. Pin 2 of the photoelectric coupler U4 is connected to pin 8 of the inverter U7, pin 3 of the photoelectric coupler U4 is connected to pin 2 of the photoelectric coupler U4, pin 3 of the photoelectric coupler U4 is connected to resistor R12, resistor R12 is grounded, pin 5 of the photoelectric coupler U4 is grounded, pin 6 of the photoelectric coupler U4 is connected to resistor R13, pin 6 of the photoelectric coupler U4 is connected to pin 7 of the photoelectric coupler U4, pin 7 of the photoelectric coupler U4 is connected to pin 12 of the inverter U7, pin 8 of the photoelectric coupler U4 is respectively connected to capacitor C8 and a power supply voltage, capacitor C8 is grounded, and resistor R14 is respectively connected to pin 6 and pin 8 of the photoelectric coupler U4.

[0058] The signal laser transmitting circuit 1 includes a signal laser U5, a capacitor C9 and a capacitor C10. Pins 1 and 9 of the signal laser U5 are grounded, pin 8 of the signal laser U5 is connected to resistor R13, pin 6 of the signal laser U5 is respectively connected to capacitor C9 and a power supply voltage, pin 5 of the signal laser U5 is respectively connected to capacitor C10 and a power supply voltage, capacitors C9 and C10 are both grounded, and pin 2 of the signal laser U5 is connected to resistor R18.

[0059] Signal amplifier circuit 1 includes resistor R20, capacitor C14, transistor Q1, transistor Q2, resistor R22, resistor R19 and resistor R21. One end of resistor R20 is connected to pin 2 of signal laser U5, and the other end of resistor R20 is connected in series with capacitor C14 and the base of transistor Q1 respectively. The collector of transistor Q1 is connected in series with pin 5 of signal laser U5, capacitor C10 and the collector of transistor Q2. The emitter of transistor Q1 is connected in series with resistor R22 and resistor R19 respectively. Resistor R22 is grounded. Resistor R19 is connected to the base of transistor Q2. The emitter of transistor Q2 is connected in series with resistor R21 and pin 1 of inverter U7 respectively. Resistor R21 is grounded.

[0060] When the signal transmission module is working: Pin 6 and Pin 7 of the CAN transceiver chip U6 are differential signal pins, Pin 1 is a TTL level receiving pin, and Pin 4 is a TTL level sending pin, which is pulled up to a high level through resistor R17. Resistors R16 and R18 can suppress signal noise. The signal sent from Pin 4 of the CAN transceiver chip U6 passes through resistor R16 and enters Pin 9 of the inverter U7 to achieve signal inversion and amplification, and then comes out from Pin 8 of the inverter U7 to connect to Pin 2 of the photocoupler U7. Pin 2 of the signal laser U5 is a signal sending pin, which is divided into two paths. One path passes through resistor R18 to enter the receiving pin of the CAN transceiver chip U6, and the other path passes through R18, C14 filtering, and then amplified by transistors Q1, Q2, and enters the inverter U7. After multiple inversions, it is output from Pin 12 to Pin 7 of the photocoupler U4. When Pin 7 is at a high level, the signal from Pin 2 can be output. That is, when there is a received signal, the signal cannot be sent at the same time. Ensure signal quality while preventing external electromagnetic interference.

[0061] In order to more intuitively observe the working status of the signal transmitting module, the signal transmitting module also includes a transceiver indicator light circuit, which includes a resistor R29, a resistor R32, a transistor Q5 and a transistor Q7, a resistor R30, a resistor R24, a resistor R25, a transistor Q3, a transistor Q4, a transistor Q6, a resistor R33, a resistor R34, a resistor R35, a resistor R26, a resistor R27, a resistor R28, a resistor R23, a resistor R24, an LED4, and an LED5;

[0062] Resistor R29 is connected to pin 8 of signal laser U5, resistor R32 is connected to pin 2 of signal laser U5, base of transistor Q5 is connected to resistor R29, collector of transistor Q5 is connected to resistor R30 and base of transistor Q4, emitter of transistor Q5 is connected to emitters of transistor Q3, transistor Q4 and transistor Q6, base of transistor Q7 is connected to resistor R32, collector of transistor Q7 is connected to resistor R31 and base of transistor Q6, emitter of transistor Q7 is connected to emitters of transistor Q3, transistor Q4 and transistor Q6, resistor R30 is connected in series with resistor R31 The power supply voltage is connected in parallel, the resistor R25 is connected to the base of the transistor Q3, the collector of the transistor Q3 is connected to the resistor R23, the resistor R25 is connected to the resistor R24, the resistor R24 ​​is connected to LED4, the resistor R23 is connected to pin 1 of LED4, the collector of the transistor Q4 is connected in series with the resistor R26, the resistor R27, and the resistor R28 respectively, the resistor R26, the resistor R27, and the resistor R28 are all connected in series with pin 1 of LED5, the collector of the transistor Q6 is connected in series with the resistor R33, the resistor R34, and the resistor R35 respectively, the resistor R33, the resistor R34, and the resistor R35 are all connected in series with pin 2 of LED5.

[0063] In this embodiment, when the CAN bus is idle, it is at a recessive level. The corresponding TTL level is high. Figure 2 The 2nd and 8th pins of the middle signal laser U5 are both high level. Figure 3 The transistors Q5 and Q7 are turned on, so the base voltages of transistors Q6 and Q4 are low and not turned on. Both lights of LED2 are off. When a signal is sent or received, TD or RD is low, and the bases of transistors Q4 and Q6 are pulled up to a high level by resistors R23 and R24. Transistors Q4 and Q6 are turned on, and LED2 lights up, realizing the sending and receiving indication function. SD defaults to a low level. When the power supply fiber is not connected, LED1 lights up red. After it is connected, SD becomes a high level, transistor Q3 turns on, and LED1 lights up green. The green and red lights of LED2 represent the sending and receiving states, respectively. Compared with controlling the signal through transistors, direct control of the indicator light has a stronger driving capability.

[0064] The signal is transmitted from the second optical fiber to the signal receiving module through the signal transmitting module. The signal receiving module includes an analog interface DSUB3 and a CAN signal receiving unit that are electrically connected. The CAN signal receiving unit includes an electrostatic and overvoltage protection circuit 2, a common mode interference suppression circuit 2, a differential signal and TTL level conversion circuit 2, a resistor R57, an inverting circuit 2, a photoelectric coupling circuit 2, a signal laser transmitting circuit 2, and a signal amplifying circuit 2 that are electrically connected in sequence. The electrostatic and overvoltage protection circuit 2 is connected to the analog interface DSUB3. The signal amplifying circuit 2 is arranged between the signal laser transmitting circuit 2 and the inverting circuit 2. The electrostatic and overvoltage protection circuit 2 is connected to the analog interface DSUB3.

[0065] The second electrostatic and overvoltage protection circuit includes a gas discharge tube GDT4, a gas discharge tube GDT5, and an ESD device D7. Pin 2 of the gas discharge tube GDT4 is connected to pin 7 of the analog interface DSUB3, pin 2 of the gas discharge tube GDT5 is connected to pin 2 of the analog interface DSUB3, pin 1 of the ESD device D7 is connected to pin 2 of the gas discharge tube GDT4 and pin 7 of the analog interface DSUB3, and pin 2 of the ESD device D7 is connected to pin 2 of the gas discharge tube GDT5 and pin 2 of the analog interface DSUB3.

[0066] The second common mode interference suppression circuit includes inductor L9 and inductor L8, pin 4 of inductor L9 is connected to pin 1 of ESD device D7, pin 3 of inductor L9 is connected to pin 2 of ESD device D7, pin 1 of inductor L9 is connected to pin 4 of inductor L8, and pin 2 of inductor L9 is connected to pin 3 of inductor L8.

[0067] The second conversion circuit between differential signal and TTL level includes CAN transceiver chip U15, resistor R56, resistor R58, capacitor C36, and capacitor C34. Pin 7 of CAN transceiver chip U15 is connected to pin 1 of inductor L8, pin 6 of CAN transceiver chip U15 is connected to pin 2 of inductor L8, pin 2 of CAN transceiver chip U15 is grounded, pin 3 of CAN transceiver chip U15 is connected to power supply voltage, pin 4 of CAN transceiver chip U15 is respectively connected to resistor R57 and resistor R58, resistor R58 is connected to power supply voltage, one end of capacitor C36 is respectively connected to resistor R58 and power supply voltage, the other end of capacitor C36 is grounded, one end of capacitor C34 is connected to pin 5 of CAN transceiver chip U15, and the other end of capacitor C34 is grounded; both ends of resistor R56 are respectively connected to pin 1 of CAN transceiver chip U15. The 8-pin and 2-pin connections.

[0068] The second inverter circuit includes an inverter U16 and a capacitor C35, wherein the 14th pin of the inverter U16 is connected to the capacitor C35 and the power supply voltage, the 7th pin of the inverter U16 is grounded, the 9th pin of the inverter U16 is connected to the resistor R57, the capacitor C35 is grounded, the 2nd pin and the 3rd pin of the inverter U16 are connected, the 4th pin and the 5th pin of the inverter U16 are connected, and the 6th pin and the 13th pin of the inverter U16 are connected;

[0069] The photoelectric coupling circuit 1 includes a photoelectric coupler U13, a resistor R53, a resistor R54, a resistor R55, and a capacitor C31. Pin 2 of the photoelectric coupler U13 is connected to pin 8 of the inverter U16. Pin 3 of the photoelectric coupler U13 is connected to pin 2 of the photoelectric coupler U13. Pin 3 of the photoelectric coupler U13 is connected to resistor R53. Resistor R53 is grounded. Pin 5 of the photoelectric coupler U13 is grounded. Pin 6 of the photoelectric coupler U13 is connected to resistor R54. Pin 6 of the photoelectric coupler U13 is connected to pin 7 of the photoelectric coupler U13. Pin 7 of the photoelectric coupler U13 is connected to pin 12 of the inverter U16. Pin 8 of the photoelectric coupler U13 is respectively connected to capacitor C31 and a power supply voltage. Capacitor C31 is grounded. Resistor R55 is respectively connected to pins 6 and 8 of the photoelectric coupler U13.

[0070] The signal laser transmitting circuit 2 includes a signal laser U14, a capacitor C32 and a capacitor C33. Pins 1 and 9 of the signal laser U14 are grounded, pin 8 of the signal laser U14 is connected to resistor R54, pin 6 of the signal laser U14 is respectively connected to capacitor C32 and a power supply voltage, pin 5 of the signal laser U14 is respectively connected to capacitor C33 and a power supply voltage, capacitors C32 and C33 are both grounded, and pin 2 of the signal laser U14 is connected to resistor R59;

[0071] The second signal amplifier circuit includes a resistor R60, a capacitor C37, a transistor Q10, a transistor Q11, a resistor R63, a resistor R61 and a resistor R62. One end of the resistor R60 is connected to the 2nd pin of the signal laser U14, and the other end of the resistor R60 is connected in series with the capacitor C37 and the base of the transistor Q10 respectively. The collector of the transistor Q10 is connected in series with the 5th pin of the signal laser U14, the capacitor C33 and the collector of the transistor Q11. The emitter of the transistor Q10 is connected in series with the resistor R63 and the resistor R61 respectively. The resistor R63 is grounded. The resistor R61 is connected to the base of the transistor Q11. The emitter of the transistor Q11 is connected in series with the resistor R62 and the 1st pin of the inverter U16 respectively, and the resistor R62 is grounded.

[0072] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.

Claims

1. A CAN photoelectric transceiver based on optical power supply, characterized in that: It includes a transmitting end and a receiving end, the transmitting end includes a constant current source module, a first energy supply module and a signal transmitting module, and the constant current source module is electrically connected to the first energy supply module; the receiving end includes a second energy supply module and a signal receiving module; the first energy supply module and the second energy supply module are connected through a first optical fiber; the signal transmitting module and the signal receiving module are connected through a second optical fiber; the transmitting end is provided with a first interface and a second interface, the constant current source module and the signal transmitting module are electrically connected to the first interface, and the signal transmitting module is electrically connected to the second interface; the receiving end is provided with a third interface, and the signal receiving module is electrically connected to the third interface.

2. The optically powered CAN photoelectric transceiver according to claim 1, characterized in that: The first interface is a DC power interface, and the second interface and the third interface are both DB9 serial interfaces.

3. The optically powered CAN photoelectric transceiver according to claim 1, characterized in that: The signal transmission module includes an analog interface DSUB1 and a CAN signal transmission unit which are electrically connected.

4. The optically powered CAN photoelectric transceiver according to claim 3, characterized in that: The constant current source module includes a constant voltage circuit, a sampling resistor R4, an operational amplifier circuit and a regulating circuit which are electrically connected in sequence; The constant voltage circuit includes a constant voltage chip U1, a resistor R3, an LED1, an LED2, an LED3, a resistor R2, a capacitor C2, a resistor R8, a resistor R9, a resistor R10, and a resistor R5. Pin 1 of the constant voltage chip U1 is connected to LED3 and capacitor C2, pin 2 of the constant voltage chip U1 is connected to the sliding end of the sliding resistor R2, capacitor C2, and resistor R8, pin 3 of the constant voltage chip U1 is connected to pin 6 of the constant voltage chip U1, pin 4 of the constant voltage chip U1 is grounded, pin 5 of the constant voltage chip U1 is connected to resistors R8 and R9, pin 7 of the constant voltage chip U1 is connected to LED1 and LED2, pin 8 of the constant voltage chip U1 is connected to resistor R3, resistors R9 and R10 are both grounded, resistor R10 is connected to LED2, a fixed end on one side of the sliding resistor R2 is connected to resistor R5, and a fixed end on the other side of the sliding resistor R2 is grounded; The operational amplifier circuit includes a dual operational amplifier U3, a resistor R7, a capacitor C3, a capacitor C4, a capacitor C5, an inductor L1, a unidirectional diode D1, a capacitor C6, a capacitor C7, and a resistor R11. Pin 1 of the dual operational amplifier U3 is grounded, pin 2 of the dual operational amplifier U3 is connected to a fixed end on one side of a sampling resistor R4, both ends of the resistor R7 are respectively connected to pin 1 and pin 2 of the dual operational amplifier U3, pin 4 of the dual operational amplifier U3 is connected to capacitor C3, and pin 5 of the dual operational amplifier U3 is connected to capacitor C3, capacitor C4, and resistor R11. The capacitor C5 is connected in series, the 3rd pin of the dual operational amplifier U3 is connected in parallel with the 6th pin of the dual operational amplifier U3, the unidirectional diode D1 is connected in series with the 3rd pin and the 6th pin of the dual operational amplifier U3, the inductor L1 is connected in series with the 3rd pin and the 6th pin of the dual operational amplifier U3, one end of the capacitor C6 is connected to the fixed end of the sampling resistor R4, the other end of the capacitor C6 is connected in series with the unidirectional diode D1, the capacitor C7 and the resistor R11, the capacitor C6, the unidirectional diode D1, the capacitor C7 and the resistor R11 are grounded, and the resistor R11 is connected to the 6th pin of the constant voltage chip U1; The regulating circuit includes a regulating chip U2, a resistor R1, a resistor R6, a capacitor C1, and a capacitor C5. Pin 1 of the regulating chip U2 is connected in series with the resistor R1 and the resistor R6. Pin 2 of the regulating chip U2 is connected in series with the capacitor C1 and the resistor R6. Pin 3 of the regulating chip U2 is connected with the capacitor C5, the capacitor C4, the capacitor C3, and the pin 5 of the dual operational amplifier U3. The capacitor C5 is grounded.

5. The optically powered CAN photoelectric transceiver according to claim 4, characterized in that: The CAN signal transmitting unit comprises an electrostatic and overvoltage protection circuit 1, a common mode interference suppression circuit 1, a differential signal and TTL level conversion circuit 1, a resistor R16, an inverting circuit 1, a photoelectric coupling circuit 1, a signal laser transmitting circuit 1, and a signal amplifying circuit 1, which are electrically connected in sequence. The electrostatic and overvoltage protection circuit 1 is connected to the analog interface DSUB1, and the signal amplifying circuit 1 is arranged between the signal laser transmitting circuit 1 and the inverting circuit 1; The electrostatic and overvoltage protection circuit 1 includes a gas discharge tube GDT1, a gas discharge tube GDT2, and an ESD device D2. Pin 2 of the gas discharge tube GDT1 is connected to pin 7 of the analog interface DSUB1, pin 2 of the gas discharge tube GDT2 is connected to pin 2 of the analog interface DSUB1, pin 1 of the ESD device D2 is connected to pin 2 of the gas discharge tube GDT1 and pin 7 of the analog interface DSUB1, and pin 2 of the ESD device D2 is connected to pin 2 of the gas discharge tube GDT2 and pin 2 of the analog interface DSUB1; The common mode interference suppression circuit 1 includes an inductor L2 and an inductor L3, wherein the 4th pin of the inductor L3 is connected to the 1st pin of the ESD device D2, the 3rd pin of the inductor L3 is connected to the 2nd pin of the ESD device D2, the 1st pin of the inductor L3 is connected to the 4th pin of the inductor L2, and the 2nd pin of the inductor L3 is connected to the 3rd pin of the inductor L2; The conversion circuit between the differential signal and the TTL level includes a CAN transceiver chip U6, a resistor R15, a resistor R17, a capacitor C13, and a capacitor C11. Pin 7 of the CAN transceiver chip U6 is connected to pin 1 of the inductor L2, pin 6 of the CAN transceiver chip U6 is connected to pin 2 of the inductor L2, pin 2 of the CAN transceiver chip U6 is grounded, pin 3 of the CAN transceiver chip U6 is connected to the power supply voltage, pin 4 of the CAN transceiver chip U6 is respectively connected to the resistor R16 and the resistor R17, the resistor R17 is connected to the power supply voltage, one end of the capacitor C13 is respectively connected to the resistor R17 and the power supply voltage, the other end of the capacitor C13 is grounded, one end of the capacitor C11 is connected to pin 5 of the CAN transceiver chip U6, and the other end of the capacitor C11 is grounded; the two ends of the resistor R15 are respectively connected to pin 8 and pin 2 of the CAN transceiver chip U6; The inverter circuit 1 includes an inverter U7 and a capacitor C12, wherein the pin 14 of the inverter U7 is connected to the capacitor C12 and the supply voltage, the pin 7 of the inverter U7 is grounded, the pin 9 of the inverter U7 is connected to the resistor R16, the capacitor C12 is grounded, the pin 2 and the pin 3 of the inverter U7 are connected, the pin 4 and the pin 5 of the inverter U7 are connected, and the pin 6 and the pin 13 of the inverter U7 are connected; The photoelectric coupling circuit 1 includes a photoelectric coupler U4, a resistor R12, a resistor R13, a resistor R14, and a capacitor C8, wherein the pin 2 of the photoelectric coupler U4 is connected to the pin 8 of the inverter U7, the pin 3 of the photoelectric coupler U4 is connected to the pin 2 of the photoelectric coupler U4, the pin 3 of the photoelectric coupler U4 is connected to the resistor R12, the resistor R12 is grounded, the pin 5 of the photoelectric coupler U4 is grounded, the pin 6 of the photoelectric coupler U4 is connected to the resistor R13, the pin 6 of the photoelectric coupler U4 is connected to the pin 7 of the photoelectric coupler U4, the pin 7 of the photoelectric coupler U4 is connected to the pin 12 of the inverter U7, the pin 8 of the photoelectric coupler U4 is respectively connected to the capacitor C8 and the supply voltage, the capacitor C8 is grounded, and the resistor R14 is respectively connected to the pin 6 and the pin 8 of the photoelectric coupler U4; The signal laser transmitting circuit 1 includes a signal laser U5, a capacitor C9 and a capacitor C10, the pins 1 and 9 of the signal laser U5 are grounded, the pin 8 of the signal laser U5 is connected to the resistor R13, the pin 6 of the signal laser U5 is respectively connected to the capacitor C9 and the power supply voltage, the pin 5 of the signal laser U5 is respectively connected to the capacitor C10 and the power supply voltage, the capacitor C9 and the capacitor C10 are both grounded, and the pin 2 of the signal laser U5 is connected to the resistor R18; The signal amplifying circuit 1 includes a resistor R20, a capacitor C14, a transistor Q1, a transistor Q2, a resistor R22, a resistor R19 and a resistor R21. One end of the resistor R20 is connected to pin 2 of the signal laser U5, and the other end of the resistor R20 is respectively connected in series with the capacitor C14 and the base of the transistor Q1. The collector of the transistor Q1 is connected in series with pin 5 of the signal laser U5, the capacitor C10 and the collector of the transistor Q2. The emitter of the transistor Q1 is respectively connected in series with the resistor R22 and the resistor R19. The resistor R22 is grounded. The resistor R19 is connected to the base of the transistor Q2. The emitter of the transistor Q2 is respectively connected in series with the resistor R21 and pin 1 of the inverter U7. The resistor R21 is grounded.

6. The optically powered CAN photoelectric transceiver according to claim 5, characterized in that: The signal transmission module also includes a transceiver indicator light circuit 1, which includes a resistor R29, a resistor R32, a transistor Q5 and a transistor Q7, a resistor R30, a resistor R24, a resistor R25, a transistor Q3, a transistor Q4, a transistor Q6, a resistor R33, a resistor R34, a resistor R35, a resistor R26, a resistor R27, a resistor R28, a resistor R23, a resistor R24, an LED4, and an LED5; The resistor R29 is connected to the 8th pin of the signal laser U5, the resistor R32 is connected to the 2nd pin of the signal laser U5, the base of the transistor Q5 is connected to the resistor R29, the collector of the transistor Q5 is connected to the resistor R30 and the base of the transistor Q4, the emitter of the transistor Q5 is connected to the emitters of the transistors Q3, Q4 and Q6, the base of the transistor Q7 is connected to the resistor R32, the collector of the transistor Q7 is connected to the resistor R31 and the base of the transistor Q6, the emitter of the transistor Q7 is connected to the emitters of the transistors Q3, Q4 and Q6, the resistor R30 is connected in series with the resistor R31 The power supply voltage is connected in parallel, the resistor R25 is connected to the base of the transistor Q3, the collector of the transistor Q3 is connected to the resistor R23, the resistor R25 is connected to the resistor R24, the resistor R24 ​​is connected to LED4, the resistor R23 is connected to pin 1 of LED4, the collector of the transistor Q4 is connected in series with the resistor R26, the resistor R27, and the resistor R28 respectively, the resistor R26, the resistor R27, and the resistor R28 are all connected in series with pin 1 of LED5, the collector of the transistor Q6 is connected in series with the resistor R33, the resistor R34, and the resistor R35 respectively, and the resistor R33, the resistor R34, and the resistor R35 are all connected in series with pin 2 of LED5.

7. The optically powered CAN photoelectric transceiver according to claim 1, characterized in that: The first energy supply module uses an energy supply laser, and the second energy supply module uses an energy supply photocell.

8. The optically powered CAN photoelectric transceiver according to claim 1, characterized in that: The first optical fiber is a power supply optical fiber, and the second optical fiber is a signal optical fiber.

9. The optically powered CAN photoelectric transceiver according to claim 5, characterized in that: The signal receiving module includes an analog interface DSUB3 and a CAN signal receiving unit which are electrically connected. The CAN signal receiving unit includes an electrostatic and overvoltage protection circuit 2, a common mode interference suppression circuit 2, a differential signal and a TTL level conversion circuit 2, a resistor R57, an inverting circuit 2, a photoelectric coupling circuit 2, a signal laser transmitting circuit 2, and a signal amplifying circuit 2 which are electrically connected in sequence. The electrostatic and overvoltage protection circuit 2 is connected to the analog interface DSUB3, and the signal amplifying circuit 2 is arranged between the signal laser transmitting circuit 2 and the inverting circuit 2. The second static and overvoltage protection circuit comprises a gas discharge tube GDT4, a gas discharge tube GDT5, and an ESD device D7. Pin 2 of the gas discharge tube GDT4 is connected to pin 7 of the analog interface DSUB3, pin 2 of the gas discharge tube GDT5 is connected to pin 2 of the analog interface DSUB3, pin 1 of the ESD device D7 is connected to pin 2 of the gas discharge tube GDT4 and pin 7 of the analog interface DSUB3, and pin 2 of the ESD device D7 is connected to pin 2 of the gas discharge tube GDT5 and pin 2 of the analog interface DSUB3; The second common mode interference suppression circuit includes an inductor L9 and an inductor L8, wherein the pin 4 of the inductor L9 is connected to the pin 1 of the ESD device D7, the pin 3 of the inductor L9 is connected to the pin 2 of the ESD device D7, the pin 1 of the inductor L9 is connected to the pin 4 of the inductor L8, and the pin 2 of the inductor L9 is connected to the pin 3 of the inductor L8; The second conversion circuit between the differential signal and the TTL level includes a CAN transceiver chip U15, a resistor R56, a resistor R58, a capacitor C36, and a capacitor C34. Pin 7 of the CAN transceiver chip U15 is connected to pin 1 of the inductor L8, pin 6 of the CAN transceiver chip U15 is connected to pin 2 of the inductor L8, pin 2 of the CAN transceiver chip U15 is grounded, pin 3 of the CAN transceiver chip U15 is connected to the power supply voltage, pin 4 of the CAN transceiver chip U15 is respectively connected to resistor R57 and resistor R58, the resistor R58 is connected to the power supply voltage, one end of the capacitor C36 is respectively connected to resistor R58 and the power supply voltage, the other end of the capacitor C36 is grounded, one end of the capacitor C34 is connected to pin 5 of the CAN transceiver chip U15, and the other end of the capacitor C34 is grounded; the resistor R56 The two ends are connected to the 8th and 2nd pins of the CAN transceiver chip U15 respectively; The second inverter circuit includes an inverter U16 and a capacitor C35, wherein the pin 14 of the inverter U16 is connected to the capacitor C35 and the power supply voltage, the pin 7 of the inverter U16 is grounded, the pin 9 of the inverter U16 is connected to the resistor R57, the capacitor C35 is grounded, the pin 2 of the inverter U16 is connected to the pin 3, the pin 4 of the inverter U16 is connected to the pin 5, and the pin 6 of the inverter U16 is connected to the pin 13; The photoelectric coupling circuit 1 includes a photoelectric coupler U13, a resistor R53, a resistor R54, a resistor R55, and a capacitor C31. Pin 2 of the photoelectric coupler U13 is connected to pin 8 of the inverter U16, pin 3 of the photoelectric coupler U13 is connected to pin 2 of the photoelectric coupler U13, pin 3 of the photoelectric coupler U13 is connected to resistor R53, the resistor R53 is grounded, pin 5 of the photoelectric coupler U13 is grounded, pin 6 of the photoelectric coupler U13 is connected to resistor R54, pin 6 of the photoelectric coupler U13 is connected to pin 7 of the photoelectric coupler U13, pin 7 of the photoelectric coupler U13 is connected to pin 12 of the inverter U16, pin 8 of the photoelectric coupler U13 is respectively connected to capacitor C31 and a power supply voltage, the capacitor C31 is grounded, and the resistor R55 is respectively connected to the photoelectric coupler U13. The 6th and 8th pins are connected; The signal laser transmitting circuit 2 includes a signal laser U14, a capacitor C32 and a capacitor C33, wherein the pins 1 and 9 of the signal laser U14 are grounded, the pin 8 of the signal laser U14 is connected to the resistor R54, the pin 6 of the signal laser U14 is respectively connected to the capacitor C32 and the power supply voltage, the pin 5 of the signal laser U14 is respectively connected to the capacitor C33 and the power supply voltage, the capacitor C32 and the capacitor C33 are both grounded, and the pin 2 of the signal laser U14 is connected to the resistor R59; The signal amplifying circuit 2 includes a resistor R60, a capacitor C37, a transistor Q10, a transistor Q11, a resistor R63, a resistor R61 and a resistor R62. One end of the resistor R60 is connected to pin 2 of the signal laser U14, and the other end of the resistor R60 is connected in series with the capacitor C37 and the base of the transistor Q10 respectively. The collector of the transistor Q10 is connected in series with pin 5 of the signal laser U14, the capacitor C33 and the collector of the transistor Q11. The emitter of the transistor Q10 is connected in series with the resistor R63 and the resistor R61 respectively. The resistor R63 is grounded. The resistor R61 is connected to the base of the transistor Q11. The emitter of the transistor Q11 is connected in series with the resistor R62 and pin 1 of the inverter U16 respectively. The resistor R62 is grounded.

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