485 and CAN communication two-in-one circuit used in digital power supply

Abstract

The utility model belongs to the technical field of circuits, and discloses a 485 and CAN communication two-in-one circuit used in a digital power supply, which comprises a port CANRXM, a port CANTXM and a chip U25, the port CANRXM is connected with one end of a resistor R8, the other end of the resistor R8 is connected with one end of a capacitor C3 and a pin 2 of the chip U25, the port CANTXM is connected with one end of a resistor R9, the other end of the resistor R9 is connected with one end of a capacitor C191 and a pin 3 of the chip U25, and the chip U25 is connected with one end of the capacitor C191. A pin 1 of the U25 is connected with a port VCC1 and one end of a capacitor C10, and the other end of the capacitor C3, the other end of the capacitor C191, the other end of the capacitor C10 and a pin 4 of the U25 are connected with a port AGND. The beneficial effects of the utility model are that the switching between the RS-485 communication mode and the CAN communication mode is realized through simple configuration, so that the digital power supply can be flexibly compatible with different communication protocols, and the stability and the reliability are ensured at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a 485 and CAN communication integrated circuit for a digital power supply. Background Art

[0002] In modern digital power supply technology, a stable communication means is essential for various power supplies to be more intelligent and "smart". Especially in industrial control and in-vehicle electronic devices, a communication with strong anti-interference ability and good compatibility is an important link for the device to achieve intelligent control and remote monitoring. When the communication function of a digital switch power supply cannot be used, its working state is very difficult to obtain and define, and there are many uncertain factors for users and the devices used. Therefore, in order to adapt to different application scenarios and system requirements, it is very important to support multiple communication protocols in digital switch power supplies. In the industrial control field, the more common communication methods are RS-485 communication and CAN (Controller Area Network) communication. Both of them have become two commonly used communication methods in digital power supplies because of their strong anti-interference ability, fast information transmission speed and suitable length in the industrial field. In order to improve compatibility and reduce the complexity and cost of the system, it is very valuable to design a circuit integrating 485 and CAN communication interfaces.

[0003] Therefore, it is necessary to provide a 485 and CAN communication integrated circuit for a digital power supply to solve the problem of communication protocol incompatibility in the communication circuit design of digital switch power supplies. Summary of the Utility Model

[0004] The utility model discloses a 485 and CAN communication integrated circuit for a digital power supply, a CAN / 485 communication compatible circuit designed based on a CAN communication chip, in particular to the problem of communication protocol incompatibility in the communication circuit design of digital switch power supplies, which can make digital switch power supplies compatible with the mainstream communication methods in the industrial field and can effectively solve the technical problems involved in the background art.

[0005] To achieve the above object, the technical solution of the utility model is as follows:

[0006] A 485 and CAN communication integrated circuit for a digital power supply, including port CAN_RX_M, port CAN_TX_M, and chip U25. One end of resistor R8 is connected to port CAN_RX_M, the other end of resistor R8 is connected to one end of capacitor C3 and pin 2 of chip U25. One end of resistor R9 is connected to port CAN_TX_M, the other end of resistor R9 is connected to one end of capacitor C191 and pin 3 of chip U25. Pin 1 of chip U25 is connected to port VCC1 and one end of capacitor C10. The other end of capacitor C3, the other end of capacitor C191, the other end of capacitor C10, and pin 4 of chip U25 are connected to port AGND. Pin 5 of chip U25 is connected to one end of resistor R7, port GND, pin 1 of protection diode D50, pin 1 of protection diode D49, one end of capacitor C193, one end of capacitor C192, and one end of capacitor C2. Pin 6 of chip U25 is connected to one end of resistor R6, pin 3 of protection diode D49, port 485-A, and pin 3 of common mode inductor L6. Pin 7 of chip U25 is connected to the other end of resistor R7, pin 3 of protection diode D50, port 485-B, and pin 2 of common mode inductor L6. Pin 8 of chip U25 is connected to port VCC2 and the other end of resistor R6. Pin 2 of protection diode D50 is connected to pin 2 of protection diode D49 and port VCC2. Pin 1 of common mode inductor L6 is connected to one end of suppression diode TVS2, the other end of capacitor C192, one end of resistor R2, and port CANH1. Pin 4 of common mode inductor L6 is connected to the other end of suppression diode TVS2, the other end of capacitor C193, one end of resistor R67, and port CANL1. The other end of resistor R2 is connected to the other end of capacitor C2 and the other end of resistor R67. Port CAN_RX_M and port CAN_TX_M are connected to the MCU, port 485-A and port 485-B are connected to the 485 communication port, and port CANH1 and port CANL1 are connected to the CAN communication port.

[0007] The technical problem to be solved by the present utility model is the problem of communication protocol incompatibility in the design of the communication circuit of a digital switching power supply. A 485 / CAN communication integrated circuit in a digital power supply is provided, which can, without changing the hardware structure, realize the switching between the RS-485 communication mode and the CAN communication mode through simple configuration, so that the digital power supply can be flexibly compatible with different communication protocols while ensuring stability and reliability. It includes: a control unit: used to configure the working mode of the circuit; an RS-485 communication module: realizing the data transceiver of the digital power supply in the form of differential signals; a CAN communication module: realizing data transceiver in a non-differential signal manner; a switching module: switching the RS-485 communication module and the CAN communication module under the control of a switching mechanism (such as switch control, or the device can also be manually removed); an interface unit: providing a physical connection for communication with external devices. The characteristics of the above-mentioned 485 / CAN communication integrated circuit of the digital power supply are: the control unit can realize mode switching through programming, and at the same time has internal logic control to ensure accurate signal identification and transmission. The switching module includes a multiplexer, which is designed to switch the signal path between the two communication modules. The interface unit includes a common physical port, which can adapt to standard 485 and CAN interfaces.

[0008] As a preferred improvement of the present utility model: the port VCC1 is connected to a 3.3V power supply, and the port VCC2 is connected to a 5V power supply.

[0009] As a preferred improvement of the present utility model: the MCU is selected as Yateli AT32F413RCT7, the port CAN_RX_M is connected to the pin 33 of the MCU, and the port CAN_TX_M is connected to the pin 34 of the MCU.

[0010] As a preferred improvement of the present utility model: the model of the chip U25 is ISO1050DUBR.

[0011] As a preferred improvement of the present utility model: the model of the protection diode D49 and the protection diode D50 is BAV99.

[0012] As a preferred improvement of the present utility model: the model of the suppression diode TVS2 is SMF6.5CA.

[0013] As a preferred improvement of the present utility model: when the CAN of the communication integrated circuit is used, the resistor R6 and its two-terminal circuit, the resistor R7 and its two-terminal circuit, the port 485-A and the port 485-B are removed.

[0014] As a preferred improvement of the present utility model: when the communication two-in-one circuit 485 is in use, the common-mode inductor L6, the suppression diode TVS2, the capacitor C193, the capacitor C192, the capacitor C2, the resistor R2, the resistor R67, the port CANH1 and the port CANL1 are removed.

[0015] As a preferred improvement of the present utility model: switches are provided at the connection ports of the resistor R6, switches are provided at the connection ports of the resistor R7, switches are provided at the connection ports of the pin 2 of the common-mode inductor L6, switches are provided at the connection ports of the pin 3 of the common-mode inductor L6, switches are provided at the connection ports of the capacitor C193, switches are provided at the connection ports of the capacitor C192, and switches are provided at the connection ports of the capacitor C2.

[0016] The beneficial effects of the present utility model are as follows:

[0017] It has a simple structure and low cost. Without changing the hardware structure, it can realize the switching between the RS-485 communication mode and the CAN communication mode through simple configuration, so that the digital power supply can be flexibly compatible with different communication protocols while ensuring stability and reliability. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where:

[0019] Figure 1 It is a schematic diagram of a 485 and CAN communication two-in-one circuit for a digital power supply in the present utility model;

[0020] Figure 2 It is a schematic diagram of the CAN communication in the present utility model;

[0021] Figure 3 It is a schematic diagram of the 485 communication in the present utility model. Detailed Embodiments

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0024] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0027] Please refer to Figure 1As shown, the present utility model provides a 485 and CAN communication integrated circuit for a digital power supply, including port CAN_RX_M, port CAN_TX_M, and chip U25. One end of resistor R8 is connected to port CAN_RX_M, the other end of resistor R8 is connected to one end of capacitor C3 and pin 2 of chip U25. One end of resistor R9 is connected to port CAN_TX_M, the other end of resistor R9 is connected to one end of capacitor C191 and pin 3 of chip U25. Pin 1 of chip U25 is connected to port VCC1 and one end of capacitor C10. The other ends of capacitor C3, capacitor C191, capacitor C10, and pin 4 of chip U25 are connected to port AGND. Pin 5 of chip U25 is connected to one end of resistor R7, port GND, pin 1 of protection diode D50, pin 1 of protection diode D49, one end of capacitor C193, one end of capacitor C192, and one end of capacitor C2. Pin 6 of chip U25 is connected to one end of resistor R6, pin 3 of protection diode D49, port 485-A, and pin 3 of common mode inductor L6. Pin 7 of chip U25 is connected to the other end of resistor R7, pin 3 of protection diode D50, port 485-B, and pin 2 of common mode inductor L6. Pin 8 of chip U25 is connected to port VCC2 and the other end of resistor R6. Pin 2 of protection diode D50 is connected to pin 2 of protection diode D49 and port VCC2. Pin 1 of common mode inductor L6 is connected to one end of suppression diode TVS2, the other end of capacitor C192, one end of resistor R2, and port CANH1. Pin 4 of common mode inductor L6 is connected to the other end of suppression diode TVS2, the other end of capacitor C193, one end of resistor R67, and port CANL1. The other end of resistor R2 is connected to the other end of capacitor C2 and the other end of resistor R67. Port CAN_RX_M and port CAN_TX_M are connected to the MCU, port 485-A and port 485-B are connected to the 485 communication port, and port CANH1 and port CANL1 are connected to the CAN communication port. Pin 1 and pin 2 of the common mode inductor L6 share one coil, and pin 3 and pin 4 share one coil. The protection diode D50 is equivalent to two diodes. The positive pole of diode A is pin 1, the negative pole of diode B is pin 2, and the negative pole of diode A and the positive pole of diode B are connected as pin 3. The protection diode D49 has the same structure as it.

[0028] The 485 / CAN communication two-in-one circuit of the present utility model has differential signals as its communication signals. Differential signals are different from serial communication and 232 communication. Serial communication and 232 communication are simple high and low levels. When an interference comes in, it will cause the instability of the high and low levels, resulting in poor communication. Both 485 and CAN communications are differential signals. If an interference comes in, it will affect both signals together, and the difference between them remains unchanged. Therefore, their communication is relatively stable. The technical solution adopted by the present utility model is a 485 / CAN communication two-in-one circuit designed based on the ISO1050DUBR communication chip. The MCU sampling is the Yotelier AT32F413RCT7. The general working principle of this circuit is that the analog signal of the MCU passes through the PB13 pin, and the page connection symbol is CAN_TX_M. CAN_TX_M is connected in series with the resistor R9, and the resistance value of the resistor R9 is 30Ω. Its main function is to improve the anti-interference ability of data. Then it is connected to the 3rd pin TXD of the ISO1050DUBR. That is, the data sent by the MCU to the 3rd pin TXD of U25 (ISO1050DUBR) will be converted into differential signals through its internal circuit and sent out from the 6 / 7 pins (CANL / CANH) of U25 (ISO1050DUBR). CANH / CANL can be called the CAN communication bus. The data sent by CAN_TX_M will be converted into differential signals and sent to the bus. The data sent by other MCUs will also be converted into differential signals and sent to the bus. Communication is actually the information exchange between two MCUs. The data sent by other MCUs will be converted into a single high and low level through the 6 / 7 pins CANL / CANH of U25 (ISO1050DUBR), pass through the 2nd pin RXD of U25 (ISO1050DUBR), and then reach the PB12 pin CAN_RX_M of the MCU through R8 (30Ω), realizing the communication between the two MCUs.

[0029] As an implementation, the port VCC1 is connected to a 3.3V power supply, and the port VCC2 is connected to a 5V power supply. The MCU selects the Yotelier AT32F413RCT7. The port CAN_RX_M is connected to the 33rd pin of the MCU, and the port CAN_TX_M is connected to the 34th pin of the MCU. The model of the chip U25 is ISO1050DUBR, and the models of the protection diodes D49 and D50 are BAV99, and the model of the suppression diode TVS2 is SMF6.5CA.

[0030] Please refer to Figure 2As shown, when the communication two-in-one circuit CAN is in use, remove resistor R6 and its two-terminal circuit, resistor R7 and its two-terminal circuit, port 485-A, and port 485-B. The general working principle of this circuit is that the analog signal of the MCU passes through pin PB13, and the page connection symbol is CAN_TX_M. CAN_TX_M is in series with resistor R9, and the resistance value of resistor R9 is 30Ω. Its main function is to improve the anti-interference ability of data. Then it is connected to pin 3 (TXD) of ISO1050DUBR. That is, the data sent by the MCU to pin 3 (TXD) of U25 (ISO1050DUBR) will be converted into differential signals through the internal circuit of U25 and output from pins 6 / 7 (CANL / CANH) of U25 (ISO1050DUBR). L6 is a common-mode inductor with an inductance value of 50uH. Pins 6 / 7 (CANL / CANH) of U25 (ISO1050DUBR) enter through pins 3 / 2 of L6 respectively and exit through pins 4 / 1 to another MCU that needs to communicate. In the figure, R2 is in series with R67, which is a termination resistor, and its value is 68Ω (the termination resistor is located at the end of the communication line, mainly for impedance matching to improve communication quality). The value of C2 is 470pF, which is generally connected in the middle of the two termination resistors to reduce the impedance to ground and improve communication quality. Pins 1 and 8 of U25 are both power supply pins. Pin 1 requires a stable 3.3V DC voltage, and pin 8 requires a stable 5V DC voltage. The peak-to-peak value of its ripple is preferably within 100mV, otherwise it will affect the communication quality of the chip. Pins 4 and 5 of U25 are both ground pins. U25 is a circuit that can achieve communication isolation and can prevent problems on one side from affecting the other side. C3 / C191 are both capacitors with a capacitance value of 100pF. They are generally connected to pins 2 / 3 of U25, with one side connected to AGND. The decoupling capacitor should be close to U25 to prevent high-frequency interference from affecting U25. C10 is a filtering capacitor with a capacitance value of 0.1uF, mainly used to filter out high-frequency interference of the power supply on pin 1. D50 / D49 on the CAN communication bus are used as protection circuits for anti-static and voltage limiting on the communication line. Its working principle is similar to that of a diode. When the anode voltage is higher than the cathode voltage, the diode will conduct, thereby limiting the voltage within a certain range. TVS2 is for voltage limiting protection to prevent the voltage across both ends from exceeding 6.5V. C193 / C19 are capacitors with a capacitance value of 330pF, which can filter out high-frequency interference on the communication line. Compared with CAN / 485 communication, CAN communication mainly removes the pull-up resistor R6, the pull-down resistor R7, does not connect the external 485 communication line to 485-A and 485-B, and connects the external CAN communication line to CANH1 and CANL1.Its working principle is as follows: When AT32F413RCT7 (MCU) CAN_TX_M sends out a high level, this high level will enter pin 3 of U25. Pin 7 of U25 will present a high level, and pin 6 of U25 will present a low level. The difference between the two levels is the high level, which is filtered by L6 and then transmitted to CANH1\CANL1 and then sent to the outside. When AT32F413RCT7 (MCU) CAN_TX_M sends out a low level, this low level will enter pin 3 of U25. The difference between pin 7 and pin 6 of U25 is 0 level, which is filtered by L6 and then transmitted to CANH1 and CANL1 and then sent to the outside. When there is a signal transmitted from the outside, it also acts on the communication line CANH1\CANL1. When the difference between the two is a high level, pin 2 of U25 will present a high level and be transmitted to AT32F413RCT7 (MCU) CAN_RX_M. When the difference between the two is 0 level, pin 2 of U25 will present a low level and be transmitted to AT32F413RCT7 (MCU) CAN_RX_M.

[0031] Please refer to Figure 3As shown, when the communication two-in-one circuit 485 is in use, the common-mode inductor L6, the suppression diode TVS2, the capacitor C193, the capacitor C192, the capacitor C2, the resistor R2, the resistor R67, port CANH1, and port CANL1 are removed. The general working principle of this circuit is as follows: The analog signal of the MCU passes through the PB13 pin, and the page connection symbol is CAN_TX_M. CAN_TX_M is in series with the resistor R9, and the resistance value of the resistor R9 is 30 Ω. Its main function is to improve the data anti-interference ability. Then it is connected to the 3rd pin TXD of ISO1050DUBR. That is, the data sent by the MCU to the 3rd pin TXD of U25 will be converted into differential signals through its internal circuit and go out from the 6 / 7th pins (CANL / CANH) of U25. The corresponding data reception is also through the 6 / 7th pins (CANL / CANH) of U25, passes through the 2nd pin of U25, and then is in series with a 30-ohm resistor R8 and sent to the PB12 pin CAN_RX_M of the MCU. Among them, the 1st and 8th pins of U25 are both power supply pins. The 1st pin requires a stable 3.3V DC voltage, and the 8th pin requires a stable 5V DC voltage. The two DC power supplies must also be isolated power supplies because U25 is an isolation chip. If its power supply is not isolated, the isolation chip has no effect. Also, the peak-to-peak value of its ripple is preferably within 100 mV, otherwise it will affect the communication quality of the chip. The 4th and 5th pins of U25 are both ground pins. U25 is a circuit that can achieve communication isolation and can prevent problems on one side from affecting the other side. C3 / C191 are both capacitors with a capacitance value of 100 pF. They are generally connected to the 2 / 3rd pins of U25, with one side connected to AGND. Their main function is decoupling. The decoupling capacitors should be close to U25 to prevent high-frequency interference from affecting U25. C10 is a filtering capacitor with a capacitance value of 0.1 uF, mainly to filter out the high-frequency interference of the power supply on the 1st pin. D50 / D49 on the CAN communication bus are used as protection circuits for anti-static and amplitude limiting on the communication line. Their working principle is similar to that of a diode. When the anode voltage is higher than the cathode voltage, the diode will conduct, thereby limiting the voltage within a certain range. R6 is used as a pull-up resistor to ensure that CANL is at a high level when idle. R7 is used as a pull-down resistor to ensure that CANH is at a low level when idle. Their resistance values are both 4.7 kΩ. Compared with CAN / 485 communication, for 485 communication, mainly 485-A and 485-B are connected to the external 485 communication line, and CANH1 and CANL1 are not connected to the external CAN communication line. Components do not need to be removed. R6 is a pull-up resistor to ensure that the communication line is at a high level when idle. R7 is a pull-down resistor to ensure that the communication line is at a low level when idle.Its working principle is as follows: When AT32F413RCT7 (MCU) CAN_TX_M sends out a high level, this high level will enter pin 3 of U25. Pin 7 of U25 will present a high level, and pin 6 of U25 will present a low level. The difference between the two levels is the high level, which is transmitted to the outside through 485-B / 485-A. When AT32F413RCT7 (MCU) CAN_RX_M sends out a low level, this low level will enter pin 3 of U25. The difference between the levels of pin 7 and pin 6 of U25 is the 0 level, which is transmitted to the outside through 485-B / 485-A. When there is a signal transmitted from the outside, it also acts on the communication line 485-B / 485-A. When the difference between the two is the high level, pin 2 of U25 will present a high level and be transmitted to AT32F413RCT7 (MCU) CAN_RX_M. When the difference between the two is the 0 level, pin 2 of U25 will present a low level and be transmitted to AT32F413RCT7 (MCU) CAN_RX_M.

[0032] The above circuit is set on the PCB. According to the usage requirements, some devices can be manually removed to achieve the change of 485 communication and CAN communication methods. Or the method of setting switches can be adopted to achieve the automatic switching between 485 communication and CAN communication. The MCU detects the communication interface or judges whether it is 485 communication or CAN communication according to the signal transmitted by the communication end, and then turns on or off the corresponding switches in the circuit, so that the circuit can be switched between the two modes of 485 communication and CAN communication. For example, switches are provided at the connection ports of the resistor R6, the resistor R7, pin 2 of the common mode inductor L6, pin 3 of the common mode inductor L6, the connection port of the capacitor C193, the connection port of the capacitor C192, and the connection port of the capacitor C2. Through the setting of the above switches, the corresponding electrical components can be connected to or disconnected from the circuit, thus automatically completing the conversion of the communication mode.

[0033] Although the implementation scheme of the present invention has been disclosed as above, it is not limited to only the applications listed in the description and the implementation scheme. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, other modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A 485 and CAN communication integrated circuit for a digital power supply, characterized in that: It includes port CAN_RX_M, port CAN_TX_M and chip U25. One end of resistor R8 is connected to port CAN_RX_M. The other end of resistor R8 is connected to one end of capacitor C3 and pin 2 of chip U25. One end of resistor R9 is connected to port CAN_TX_M. The other end of resistor R9 is connected to one end of capacitor C191 and pin 3 of chip U25. Pin 1 of chip U25 is connected to port VCC1 and one end of capacitor C10. The other ends of capacitor C3, capacitor C191, capacitor C10 and pin 4 of chip U25 are connected to port AGND. Pin 5 of chip U25 is connected to one end of resistor R7, port GND, pin 1 of protection diode D50, pin 1 of protection diode D49, one end of capacitor C193, one end of capacitor C192 and one end of capacitor C2. Pin 6 of chip U25 is connected to one end of resistor R6, pin 3 of protection diode D49, port 485-A and pin 3 of common mode inductor L6. Pin 7 of chip U25 is connected to the other end of resistor R7, pin 3 of protection diode D50, port 485-B and pin 2 of common mode inductor L6. Pin 8 of chip U25 is connected to port VCC2 and the other end of resistor R6. Pin 2 of protection diode D50 is connected to pin 2 of protection diode D49 and port VCC2. Pin 1 of common mode inductor L6 is connected to one end of suppression diode TVS2, the other end of capacitor C192, one end of resistor R2 and port CANH1. Pin 4 of common mode inductor L6 is connected to the other end of suppression diode TVS2, the other end of capacitor C193, one end of resistor R67 and port CANL1. The other end of resistor R2 is connected to the other end of capacitor C2 and the other end of resistor R67; Port CAN_RX_M and port CAN_TX_M are connected to the MCU. Port 485-A and port 485-B are connected to the 485 communication port. Port CANH1 and port CANL1 are connected to the CAN communication port.

2. The 485 and CAN communication integrated circuit for a digital power supply according to claim 1, wherein: Port VCC1 is connected to a 3.3V power supply. Port VCC2 is connected to a 5V power supply.

3. The 485 and CAN communication integrated circuit for a digital power supply according to claim 1, characterized in that: The MCU selected is Yotelic AT32F413RCT7. Port CAN_RX_M is connected to pin 33 of the MCU. Port CAN_TX_M is connected to pin 34 of the MCU.

4. The 485 and CAN communication integrated circuit for a digital power supply according to claim 1, wherein: The model of chip U25 is ISO1050DUBR.

5. A 485 and CAN communication two-in-one circuit for a digital power supply according to claim 1, characterized in that: The models of protection diode D49 and protection diode D50 are BAV99.

6. The 485 and CAN communication two-in-one circuit for a digital power supply according to claim 1, wherein: The model of suppression diode TVS2 is SMF6.5CA.

7. The 485 and CAN communication integrated circuit for a digital power supply according to claim 1, characterized in that: When the communication two-in-one circuit CAN is in use, remove resistor R6 and its two ends of the circuit, resistor R7 and its two ends of the circuit, port 485-A and port 485-B.

8. The 485 and CAN communication integrated circuit for a digital power supply according to claim 1, characterized in that: When the communication two-in-one circuit 485 is in use, remove the common-mode inductor L6, the suppression diode TVS2, the capacitor C193, the capacitor C192, the capacitor C2, the resistor R2, the resistor R67, port CANH1 and port CANL1.

9. The 485 and CAN communication integrated circuit for a digital power supply according to claim 1, wherein: Switches are provided at the connection ports of the resistor R6, the resistor R7, the connection port of pin 2 of the common-mode inductor L6, the connection port of pin 3 of the common-mode inductor L6, the connection port of the capacitor C193, the connection port of the capacitor C192, and the connection port of the capacitor C2.

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