A communication interface isolation and protection device

Abstract

This invention discloses a communication interface isolation and protection device, comprising a first communication interface, a second communication interface, a magnetic coupling conversion unit, a first transient noise suppression module, a first power supply integral voltage regulator module, and a second transient noise suppression module. The first and second transient noise suppression modules suppress transient noises such as lightning surges, EFTs, and electrostatic discharges from the interface device, and partially protect against continuous high-voltage noise. The power and data signals, after transient noise has been filtered out, are respectively sent to the first and second power supply integral voltage regulator modules and the magnetic coupling conversion unit. The first and second power supply integral voltage regulator modules then rectify, integrate, and stabilize the weak current on the communication line to the magnetic coupling conversion unit. The magnetic coupling conversion unit exchanges the data signals at both ends, achieving complete isolation of the signal power supply on both sides. This design is simple in structure and saves on production costs.

Description

Technical Field

[0001] This invention belongs to the field of communication technology, and more specifically, relates to a communication interface isolation and protection device. Background Technology

[0002] Existing RS232 bus isolation methods utilize optocoupler technology, employing a light beam to isolate and protect detection circuits and provide a safe interface between high-voltage and low-voltage electrical environments. When one device is subjected to transient or continuous high-voltage, high-current interference such as lightning strikes, surges, electrical fast transient bursts (EFT), electrostatic discharge (ESD), high-voltage power line contact, or power line coupling, strong interference noise will inevitably flow along the interconnecting cables from the affected device to other devices due to the common ground and direct interconnection of signal lines, disrupting or affecting the normal operation of these devices.

[0003] Chinese patent application CN 210324194 U discloses "A magnetic coupling isolation protection circuit for a communication interface". The magnetic coupling chip used in that solution is ADUM1201ARZ, while this solution uses the domestic CA-IS3721HS or Π121M31, which has a significant price advantage and a higher performance-price ratio in terms of isolation security and data transmission rate. The isolation power supply of Nanjing Autong's solution uses the magnetically isolated DC-DC module F03058-1WR2, which is bulky and the isolation is not thorough enough. There is power supply interference coupling on both sides of the isolated circuit. In today's increasingly stringent EMC requirements, it is insufficient to meet the EMC needs of sensitive interconnect products. It cannot achieve complete isolation of the signal power supply on both sides, and requires a separate power supply, which is complex in structure and has poor signal transmission.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies and provide a communication interface isolation and protection device. This device includes a first transient noise suppression module and a second transient noise suppression module in the circuit. During information transmission through the communication interface, these modules suppress transient noises such as lightning surges, EFTs, and electrostatic discharges from external serial port devices, and partially protect against high-voltage continuous noise. The power supply and signal, after filtering out transient noise, are respectively sent to the first power supply integral voltage regulator module, the second power supply integral voltage regulator module, and the magnetic coupling conversion unit. The first and second power supply integral voltage regulator modules are responsible for rectifying, integrating, and regulating the weak current on the communication line to the magnetic coupling conversion unit. The magnetic coupling conversion unit is responsible for transmitting and receiving high-speed serial signals on both sides of the conversion and filtering out possible transient interference, ensuring the stability of high-speed signal transmission via magnetic coupling, and achieving complete isolation of the signal power supply on both interconnected sides.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is: a communication interface isolation and protection device, comprising,

[0007] The first communication interface is used to acquire high-speed serial signals;

[0008] The second communication interface is used to acquire high-speed serial signals;

[0009] The first transient noise suppression module is connected to the first communication interface and is used to receive the signal acquired by the first communication interface and filter out transient noise in the signal.

[0010] The first power supply integral voltage regulator module is connected to the first transient noise suppression module and is used to rectify and integrate the weak current in the signal after the noise has been filtered out by the first transient noise suppression module.

[0011] The second transient noise suppression module is connected to the second communication interface and is used to receive the signal acquired by the first communication interface and filter out transient noise in the signal.

[0012] The second power supply integral voltage regulator module is connected to the second transient noise suppression module and is used to rectify and integrate the weak current in the signal after the noise has been filtered out by the second transient noise suppression module.

[0013] The magnetic coupling conversion unit receives data signals and power signals processed by the first transient noise suppression module and the first power supply integral voltage regulation module at one end, and receives data signals and power signals processed by the second transient noise suppression module and the second power supply integral voltage regulation module at the other end, respectively, and is used to transmit the data signals received at both ends to the corresponding ends.

[0014] The first transient noise suppression module includes,

[0015] The first electrostatic protection unit is used to clamp abnormal high voltages in the transmission process of the signal obtained by the first communication interface to a safe level during the transmission of the first transient noise suppression module.

[0016] The first signal channel noise suppression unit is connected at one end to the first electrostatic protection unit and at the other end to one end of the magnetic coupling conversion unit. It is used to receive the data signal acquired by the first electrostatic protection unit, suppress the common-mode noise in the data signal, and transmit it to one end of the magnetic coupling conversion unit.

[0017] Furthermore, the first transient noise suppression module also includes,

[0018] The first surge discharge unit is connected to the first communication interface and is used to limit the overvoltage and discharge surge current generated when the first communication interface acquires signals.

[0019] The first rectifier and filter unit is connected between the first communication interface and the first electrostatic protection unit. It is used to convert the alternating signal obtained by the first communication interface during signal transmission into a pulsating DC voltage and has an auxiliary protection function against impact.

[0020] Preferably, the first rectifier and filter unit is a multi-channel integrated diode array U3A.

[0021] Furthermore, the first power supply integral voltage regulator module includes,

[0022] The first low-voltage regulator unit is connected to the first transient noise suppression module and is used to receive the power signal transmitted by the first transient noise suppression module and stabilize the output voltage.

[0023] The first high-frequency noise filtering unit is connected to the first low-voltage regulator unit, and the other end is connected to one end of the magnetic coupling conversion unit. It is used to suppress common-mode noise and differential-mode noise in the output power signal of the first low-voltage regulator unit and transmit it to one end of the magnetic coupling conversion unit.

[0024] Preferably, the first low-voltage regulator unit includes an adjustable voltage regulator TL431.

[0025] Furthermore, it also includes a second rectifier and filter unit, which is connected to the first electrostatic protection unit. It is used to absorb and convert the alternating signal processed by the first transient noise suppression module into a pulsating DC voltage, and has an auxiliary protection effect against impacts.

[0026] The first current-limiting integral energy storage unit is connected between the second rectifier and filter unit and the first low-voltage regulator unit. It is used to store the power signal absorbed by the second rectifier and filter unit and transmit it to the first low-voltage regulator unit.

[0027] Preferably, the second rectifier filter unit is a multi-channel integrated diode array U1A.

[0028] Furthermore, the second transient noise suppression module includes,

[0029] The second electrostatic protection unit is used to clamp abnormal high voltage to a safe level during the transmission of the signal obtained by the second communication interface through the second transient noise suppression module.

[0030] The second signal channel noise suppression unit is connected at one end to the second electrostatic protection unit and at the other end to the other end of the magnetic coupling conversion unit. It is used to receive the data signal acquired by the second electrostatic protection unit, suppress the common-mode noise in the data signal, and transmit it to the other end of the magnetic coupling conversion unit.

[0031] Furthermore, the second transient noise suppression module also includes,

[0032] The second surge discharge unit is connected to the second communication interface and is used to limit the overvoltage and discharge surge current generated when the second communication interface acquires signals.

[0033] The third rectifier and filter unit is connected between the first communication interface and the second electrostatic protection unit. It is used to convert the alternating signal obtained by the first communication interface into a pulsating DC voltage and provides auxiliary protection against impacts.

[0034] Furthermore, the second power supply integral voltage regulator module includes,

[0035] The second low-voltage regulator unit is connected to the second transient noise suppression module and is used to receive the power signal transmitted by the second transient noise suppression module to stabilize the output voltage.

[0036] The second high-frequency noise filtering unit is connected at one end to the second low-voltage regulator unit and at the other end to the other end of the magnetic coupling converter unit. It is used to suppress common-mode noise and differential-mode noise in the output power signal of the second low-voltage regulator unit and transmit it to the other end of the magnetic coupling converter unit.

[0037] Preferably, the second low-voltage regulator unit includes an adjustable voltage regulator TL431.

[0038] Furthermore, the second power supply integral voltage regulator module also includes,

[0039] The fourth rectifier and filter unit is connected to the first electrostatic protection unit. It is used to absorb and convert the alternating signal processed by the first transient noise suppression module into a pulsating DC voltage, and has an auxiliary protection effect against impacts.

[0040] The second current-limiting integral energy storage unit is connected between the fourth rectifier and filter unit and the second low-voltage regulator unit. It is used to store the power signal absorbed by the fourth rectifier and filter unit and transmit it to the second low-voltage regulator unit.

[0041] Furthermore, the second power supply integral voltage regulator module also includes an electrostatic discharge protection unit, which is connected between the third rectification and filtering unit and the second current limiting integral energy storage unit, to prevent electrostatic discharge (ESD) from occurring when objects with different electrostatic potentials approach or directly contact the second power supply integral voltage regulator module.

[0042] The third rectifier and filter unit is a multi-channel integrated diode array U1B, and the electrostatic discharge protection unit is a multi-channel integrated diode array U3B.

[0043] Furthermore, the magnetic coupling conversion unit includes,

[0044] The first signal terminal is connected to the first transient noise suppression module and is used to receive the data signal processed by the first transient noise suppression module.

[0045] The first power supply terminal is connected to the first power supply integral voltage regulator module and is used to receive the power signal after it has been processed and stabilized by the first power supply integral voltage regulator module.

[0046] The second signal terminal is connected to the second transient noise suppression module and is used to receive the data signal processed by the second transient noise suppression module.

[0047] The second power supply terminal is connected to the second power supply integral voltage regulator module and is used to receive the stable power supply signal processed by the second power supply integral voltage regulator module.

[0048] The conversion module is used to transmit the data signal from the first signal terminal and the data signal from the second signal terminal bidirectionally.

[0049] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0050] (1) The present invention sets up a first transient noise suppression module, a second transient noise suppression module, a first power supply integral voltage regulator module, and a second power supply integral voltage regulator module in the device. When transmitting information through the communication interface, the first transient noise suppression module and the second transient noise suppression module are used to suppress transient noises such as lightning surges, EFTs, and electrostatic discharges from external serial port devices during the transmission of information through the first and second communication interfaces, respectively, and partially protect against high voltage continuous noise. The power supply and signal filtered out from the first and second communication interfaces are respectively sent to the first power supply integral voltage regulator module, the second power supply integral voltage regulator module, and the magnetic coupling conversion unit. Then, the first power supply integral voltage regulator module and the second power supply integral voltage regulator module are responsible for rectifying, integrating, and stabilizing the weak current on the signal line to the stable power supply required by the high-speed magnetic isolation chip, and then sending it to the power supply terminal of the magnetic coupling conversion unit. The magnetic coupling conversion unit is responsible for receiving and transmitting high-speed serial signals on both sides of the conversion and filtering out possible transient interference to ensure the stability of high-speed signals transmitted by magnetic coupling.

[0051] (2) The present invention enables complete isolation of the signal power supply on both sides of the interconnection. Instead of using the isolation power conversion module of the coupled sides, the voltage generated by the accumulation of the signal current of each side is sufficient. On the other hand, the present invention uses highly integrated power supply and diode array, and uses ordinary adjustable power supply TL431, which makes the size smaller and the price lower.

[0052] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0053] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0054] Figure 1 This is a flowchart of a communication interface isolation and protection device according to the present invention;

[0055] Figure 2 This is a flowchart of a communication interface isolation and protection device according to the present invention;

[0056] Figure 3 This is a circuit diagram of a communication interface isolation and protection device according to the present invention.

[0057] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0059] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0060] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0061] like Figures 1 to 3As shown, the communication interface isolation and protection device of the present invention includes a first communication interface, a second communication interface, a magnetic coupling conversion unit U0, a first transient noise suppression module DA, a first power supply integral voltage regulator module UA, a second transient noise suppression module DB, and a second power supply integral voltage regulator module UB.

[0062] The first communication interface is used to acquire high-speed serial signals.

[0063] The second communication interface is used to acquire high-speed serial signals.

[0064] The first transient noise suppression module DA is connected to the first communication interface at one end, and is used to receive the signal acquired by the first communication interface and filter out the transient noise in the signal.

[0065] One end of the first power supply integral voltage regulator module UA is connected to the first transient noise suppression module DA, and is used to rectify and integrate the weak current in the signal after the noise has been filtered out by the first transient noise suppression module DA.

[0066] The second transient noise suppression module DB is connected to the second communication interface and is used to receive the signal acquired by the second communication interface and filter out the transient noise in the signal.

[0067] The second power supply integral voltage regulator module UB is connected to the second transient noise suppression module DB, and is used to rectify and integrate the weak current in the signal after the noise has been filtered out by the second transient noise suppression module DB.

[0068] The magnetic coupling conversion unit U0 receives data signals and power signals processed by the first transient noise suppression module DA and the first power supply integral voltage regulation module UA at one end, and data signals and power signals processed by the second transient noise suppression module DB and the second power supply integral voltage regulation module UB at the other end, and is used to transmit the data signals received at both ends to the corresponding ends.

[0069] This invention, by incorporating a first transient noise suppression module DA and a second transient noise suppression module DB into the device, suppresses transient noises such as lightning surges, EFTs, and electrostatic discharges from external serial port devices when receiving signals at the communication interface. It also partially protects against high-voltage continuous noise. The power signal and data signal, after being filtered to remove transient noise, are respectively sent to a first power integration regulator module UA, a second power integration regulator module UB, and a magnetic coupling conversion unit U0. The first power integration regulator module UA and the second power integration regulator module UB rectify, integrate, and regulate the weak current on the signal lines to the stable power supply required by the high-speed magnetic isolation chip. The magnetic coupling conversion unit U0 is responsible for transmitting and receiving high-speed serial signals on both sides of the conversion and filtering out possible transient interference, ensuring the stability of high-speed signals transmitted via magnetic coupling, and overcoming the shortcoming of isolated communication not being able to completely isolate power supply noise.

[0070] The magnetic coupling conversion unit U0 is a dual-channel digital isolator CA-IS3721HS.

[0071] Furthermore, the magnetic coupling conversion unit U0 includes a first signal terminal, a first power supply terminal, a second signal terminal, a second power supply terminal, and a conversion module.

[0072] The first signal terminal is connected to the first transient noise suppression module DA and is used to receive the data signal processed by the first transient noise suppression module DA.

[0073] The first power supply terminal is connected to the first power supply integral voltage regulator module UA and is used to receive the stable power supply signal processed by the first power supply integral voltage regulator module UA.

[0074] The second signal terminal is connected to the second transient noise suppression module DB and is used to receive the data signal processed by the second transient noise suppression module DB.

[0075] The second power supply terminal is connected to the second power supply integral voltage regulator module UB and is used to receive the stable power supply signal processed by the second power supply integral voltage regulator module UB.

[0076] The conversion module is used to transmit the data signal from the first signal terminal and the data signal from the second signal terminal bidirectionally.

[0077] This invention connects the first transient noise suppression module DA and the second transient noise suppression module DB to the first and second signal terminals of the magnetic coupling conversion unit U0, and connects the first power supply integral voltage regulator module UA and the second power supply integral voltage regulator module UB to the first and second power supply terminals of the magnetic coupling conversion unit U0. During signal transmission, the first transient noise suppression module DA and the second transient noise suppression module DB first partially protect against transient noise such as lightning surges, EFTs, and electrostatic discharges from external serial port devices, as well as high-voltage continuous noise. The power supply with filtered transient noise is then supplied to the first power supply integral voltage regulator module UA and the second integral voltage regulator module UB. The data signal is then transmitted... The signal is sent to the first and second signal terminals of the magnetic coupling conversion unit U0. Then, the first power supply integral voltage regulator module UA and the second power supply integral voltage regulator module UB rectify, integrate, and regulate the weak current on the signal lines to the first and second power supply terminals of the magnetic coupling conversion unit U0. The magnetic coupling conversion unit U0 then transmits and receives high-speed serial signals on both sides of the conversion through the conversion module, and filters out possible transient interference to ensure the stability of high-speed signals transmitted by magnetic coupling. This solves the shortcomings of isolated communication that cannot completely isolate power supply noise. It not only realizes bidirectional high-speed communication, but also meets the requirements of installation and electromagnetic compatibility, and has a smaller size, saving production costs.

[0078] The power signal described in this invention is not limited to power current or power voltage.

[0079] Furthermore, the first transient noise suppression module DA includes a first electrostatic protection unit and a first signal channel suppression unit.

[0080] The first electrostatic protection unit is used to clamp abnormal high voltages in the transmission process of the signal obtained by the first interface to a safe level during the transmission of the signal by the first transient noise suppression module DA.

[0081] One end of the first signal channel noise suppression unit is connected to the first electrostatic protection unit, and the other end is connected to one end of the magnetic coupling conversion unit. It is used to receive the data signal acquired by the first electrostatic protection unit, suppress the common-mode noise in the data signal, and transmit it to one end of the magnetic coupling conversion unit.

[0082] By setting a first electrostatic protection unit and a first signal channel suppression unit, the noise current generated during signal transmission is clipped and suppressed. The first signal channel suppression unit consists of resistors R1A and R2A and a ferrite bead L1A connected in series between the input signal and the magnetic coupling conversion unit U0. Its power and resistance value are related to the noise intensity of the input environment and the load unit U0, and can often be between 300 and 1kΩ.

[0083] Specifically, the first electrostatic discharge protection unit includes diode D1A and diode D2A. One end of diode D1A is connected to pin 3 of the first communication interface, and the other end of diode D1A is connected to pin 5 of the first communication interface, pin 1 of the multi-channel integrated diode array U3A, and pin 4 of U3A. One end of diode D2A is connected to the other end of diode D1A and pin 5 of the first communication interface. The connection end of diode D2A with pin 5 of the first communication interface is connected to pin 1 of the multi-channel integrated diode array U3A and pin 4 of U3A. The other end of diode D2A is connected to pin 2 of the first communication interface.

[0084] The first signal channel noise suppression unit includes resistors R1A and R2A and a ferrite bead L1A. The ferrite bead L1A is connected to pin 1 of the multi-channel integrated diode array U3A and the other end is connected to pin 4 of the magnetic coupling conversion unit U0. Resistor R1A is connected to pin 2 of the first communication interface and the other end is connected to pin 2 of the magnetic coupling conversion unit U0. Resistor R2A is connected to the first communication interface 3 and the other end is connected to pin 2 of the magnetic coupling conversion unit U0.

[0085] This invention includes, but is not limited to, using two sets of common-mode inductors and capacitors (i.e., one set between pins 2 and 5, and another set between pins 3 and 5) in conjunction with a suitable filter circuit (C-type, Γ-type, or π-type) between the preamplifiers of R1A and R2A and pin 5 to suppress common-mode noise; a level conversion unit can also be used to achieve reliable level conversion; (See attached...) Figure 3 Its application is a basic application, suitable for environments where electromagnetic noise is relatively clean and common.

[0086] Preferably, the first transient noise suppression module DA further includes a first surge discharge unit and a first rectifier filter unit.

[0087] The first surge discharge unit is connected to the first communication interface and is used to limit the overvoltage and discharge surge current generated when the first communication interface acquires the signal.

[0088] The first rectifier and filter unit is connected between the first communication interface and the first electrostatic protection unit. It is used to absorb and convert the alternating signal obtained by the first communication interface into a pulsating DC voltage during signal transmission, and has an auxiliary protection effect against impact.

[0089] Preferably, the first rectifier and filter unit is a multi-channel integrated diode array U3A.

[0090] This invention incorporates a first surge discharge unit and a first rectification and filtering unit within the first transient noise suppression module DA. During operation, when the signal from the first communication interface passes through the first surge discharge unit, it prevents the initial voltage from becoming excessively high, which could damage subsequent circuits. Subsequently, the high-speed transmitted signal passes through the first rectification and filtering unit, which absorbs low-energy high-voltage pulses that occur instantaneously in the circuit, thus protecting the safety of subsequent circuits.

[0091] Specifically, such as Figure 3 As shown, the first surge unit includes a capacitor CGA and a resistor RGA. One end of the capacitor CGA is connected to pin 5 of the first communication interface, and the other end is connected to pins 10 and 11 of the first communication interface. One end of the resistor RGA is connected to pin 5 of the first communication interface, and the other end is connected to pins 10 and 11 of the first communication interface. The capacitor CGA and the resistor RGA are connected in parallel. The ends of the capacitor CGA and the resistor RGA connected to pin 11 of the first communication interface are connected to the mechanical ground of the housing.

[0092] The interface design of the floating common mode grounding design of the unshielded enclosure in this invention includes, but is not limited to, all unshielded enclosures. The 680pF of the CGA can be selected between 100pF and 4700pF according to the spectrum selection requirements for different purposes such as EMI interference and EMS shunt.

[0093] The first rectifier and filter unit includes a multi-channel integrated diode array U3A. Pin 3 of the multi-channel integrated diode array U3A is connected to pins 7 and 8 of the first communication interface. Pins 2 and 5 of the multi-channel integrated diode array U3A are connected, and the connection terminal is connected to the power network VCC1. Pin 4 of the multi-channel integrated diode array U3A is grounded. Pin 6 of the multi-channel integrated diode array U3A is left floating. Pin 1 of the multi-channel integrated diode array U3A is grounded and connected to the first signal channel noise suppression unit.

[0094] Furthermore, the first power supply integral voltage regulator module UA includes a second rectification and filtering unit, a first current-limiting integral energy storage unit, a first low-voltage voltage regulator unit, and a first high-frequency noise filtering unit.

[0095] The first low-voltage regulator unit is connected to the first transient noise suppression module DA, and is used to receive the power signal transmitted by the first transient noise suppression module to stabilize the output voltage.

[0096] The first high-frequency noise filtering unit is connected to the first low-voltage regulator unit, and the other end is connected to one end of the magnetic coupling conversion unit. It is used to suppress common-mode noise and differential-mode noise in the output power signal of the first low-voltage regulator unit and transmit it to one end of the magnetic coupling conversion unit.

[0097] Preferably, the first low-voltage regulator unit includes an adjustable voltage regulator TL431.

[0098] By connecting the first low-voltage regulator unit to the first transient noise suppression module DA, the power signal with transient noise filtered out is stabilized by the adjustable voltage regulator TL431 to output a stable voltage. Then, the stable power signal is filtered out by the first high-frequency noise filtering unit to remove common-mode noise and differential-mode noise. The power signal is then sent to the first power supply terminal of the magnetic coupling conversion unit to realize the transmission of the power signal.

[0099] The second rectifier and filter unit is connected to the first electrostatic protection unit. It is used to absorb and convert the alternating signal processed by the first transient noise suppression module DA into a pulsating DC voltage, and has an auxiliary protection effect against impact.

[0100] The first current-limiting integral energy storage unit is connected between the second rectifier and filter unit and the first low-voltage regulator unit, and is used to store the power signal absorbed by the second rectifier and filter unit and transmit it to the first low-voltage regulator unit.

[0101] This invention improves the stability of power signal transmission by adding a second rectification and filtering unit and a first current-limiting integral energy storage unit during the power signal transmission process. When the power signal passes through the second rectification and filtering unit, it absorbs and converts the alternating signal into a pulsating DC voltage, and provides auxiliary protection against surges. Then, the converted power signal is stored in the first current-limiting integral energy storage unit and then transmitted to the first low-voltage regulator unit. This avoids the voltage input to the first low-voltage regulator unit being too strong or too weak, thereby improving the safety and stability of the device operation.

[0102] Preferably, the second rectifier filter unit is a multi-channel integrated diode array U1A.

[0103] The first current-limiting integral energy storage unit can also be directly connected to the first transient noise suppression module as needed.

[0104] This invention incorporates a second rectification and filtering unit within the first power supply integral voltage regulator module UA to rectify and filter the input signal, suppressing common-mode noise and differential-mode noise. The signal then passes through a first current-limiting integral energy storage unit to prevent excessively strong or weak input voltage, thus avoiding overvoltage or undervoltage of the load. The output voltage is then stabilized by a first low-voltage regulator unit and finally by a first high-frequency noise filter unit, which rectifys, integrates, and stabilizes the weak current on the signal line to the stable power supply required by the high-speed magnetic isolation chip before sending it to the first power supply terminal of the magnetic coupling conversion unit U0.

[0105] The second rectifier and filter unit in this invention includes, but is not limited to, an integrated diode array U1A, etc. A first path, synthesized from pins 1, 4, and 6 of the first communication interface, is connected to pin 6 of U1A. Pin 3 of U1A is connected to pin 2 of the first communication interface. Pins 4 and 1 of U1A are grounded. Pin 5 of U1A is connected to pin 2. The connection terminal is connected to the power network VCC1. This invention includes, but is not limited to, [the following]. Figure 3 The additional filtering circuit after rectification is not provided (R6A and C1A only partially replace the filtering circuit). It is necessary to select an appropriate filtering circuit (C-type, Γ-type or π-type) according to the noise of the input signal to smooth the pulsating DC ripple signal and suppress power supply noise.

[0106] The first current-limited integral energy storage unit includes R5A, R6A, and C1A. This invention includes, but is not limited to, integral energy storage circuits using other energy storage components (including supercapacitors, various batteries, charge pump ICs, etc.) for C1A; this invention includes, but is not limited to, integral energy storage circuits using other energy storage components (including supercapacitors, various batteries, charge pump ICs, etc.). Figure 3 Other units not shown in the diagram, used for load overvoltage and undervoltage protection energy storage circuits to determine whether the input energy is too strong or too weak;

[0107] The first low-voltage regulator unit is composed of R3A, R4A, R5A, U2A, etc. This invention includes, but is not limited to, the use of various low-power LDO, DC-DC, charge pump power supply circuits in the UA section, such as HPxxxx, MExxxx, SSPxxxx, MSTxxxx, HTxxxx, LPxxxx, etc., low-power power regulator ICs.

[0108] The first high-frequency noise filtering unit is composed of L2A and C2A. This invention includes, but is not limited to, other high-frequency filtering circuits, such as selecting a suitable filtering circuit (C-type, Γ-type or π-type) according to the noise situation of the input signal to suppress the required common-mode and differential-mode noise.

[0109] Specifically, such as Figure 3 As shown, the first current-limiting integral energy storage unit includes resistor R5A, resistor R6A and capacitor C1A. One end of resistor R5A is connected to the power network VCC1 and one end of diode D3A respectively. The other end of diode D3A is grounded. Diode D3A is connected in series with resistor R5A. The other end of resistor R5A is connected in series with resistor R6A. The other end of resistor R6A is connected in series with capacitor C1A. The other end of capacitor C1A is grounded.

[0110] The first low-voltage regulator unit includes resistors R3A and R4A. One end of resistor R3A is connected to the other end of resistor R5A, the other end of resistor R3A is connected in series with resistor R4A, the other end of resistor R4A is grounded, the connection end of resistors R3A and R4A is connected to the reference electrode of the voltage regulator, the cathode of the voltage regulator is connected to the other end of resistor R3A, and the anode of the voltage regulator is grounded.

[0111] The first high-frequency noise filtering unit includes an inductor L2A and a capacitor C2A. The inductor L2A is connected to the cathode of the voltage regulator. The connection point between the inductor L2A and the cathode of the voltage regulator is connected to the power supply network VCCA. The other end of the inductor L2A is connected in series with the capacitor C2A. The other end of the capacitor C2A is connected to pin 4 of the magnetic coupling conversion unit. The connection point between the inductor L2A and the capacitor C2A is connected to pin 1 of the magnetic coupling conversion unit. A diode D4A is connected in parallel across the two ends of the capacitor C2A. One end of the diode D4A is grounded to the connection point of the C2A.

[0112] Preferably, the diode D4A is a two-stage electrostatic discharge TVS.

[0113] In this invention, when transmitting signals through the first communication interface, the first transient noise suppression module DA is used to suppress transient noises such as lightning surges, EFTs, and electrostatic discharges from external serial port devices, partially protecting against high-voltage continuous noise. The power signal and data signal, after filtering out transient noise, are respectively sent to the first signal terminals of the first power integral voltage regulator module UA and the magnetic coupling conversion unit U0. The first power integral voltage regulator module UA is responsible for rectifying, integrating, and stabilizing the weak current on the signal line to the stable power supply required by the high-speed magnetic isolation chip, and then sending it to the first power terminal of the magnetic coupling conversion unit U0, so as to achieve complete isolation during data signal transmission and realize high-speed signal transmission at the first communication interface. At the same time, the first power integral voltage regulator module UA itself has a driving capability of about 10mA, while the power driving current of the magnetic isolation chip is generally only a few mA. Therefore, without using the mutually coupled power conversion modules on both sides, it is sufficient to use the voltage generated by the accumulation of their respective signal currents on the capacitors. This not only realizes bidirectional high-speed communication (10Mbps~200Mbps, or even higher, which can be used for higher-speed interfaces), but also meets electromagnetic compatibility requirements while having a smaller PCB size and lower price.

[0114] Furthermore, the second transient noise suppression module DB includes a second surge discharge unit, a third rectification and filtering unit, a second electrostatic protection unit, and a second signal channel noise suppression unit.

[0115] The second electrostatic protection unit is used to clamp abnormal high voltage to a safe level during the transmission of the signal obtained by the second communication interface through the second transient noise suppression module.

[0116] One end of the second signal channel noise suppression unit is connected to the second electrostatic protection unit, and the other end is connected to the other end of the magnetic coupling conversion unit. It is used to receive the data signal acquired by the second electrostatic protection unit, suppress the common-mode noise in the data signal, and transmit it to the other end of the magnetic coupling conversion unit.

[0117] This invention achieves complete isolation between the signal of the first communication interface and the signal power of the second communication interface by setting a second transient noise suppression module DB between the second communication interface and the magnetic coupling conversion unit U0, and a first transient noise suppression module DA between the first communication interface and the magnetic coupling conversion unit U0. A second surge discharge unit limits overvoltage and inrush current generated in the circuit during signal transmission. The data signal is then transmitted to a second electrostatic protection unit, suppressing the power supply during data transmission to a safe level. Finally, a second signal channel noise suppression unit transmits the data signal with filtered transient noise to the signal terminal of the magnetic coupling conversion unit U0, and the power supply is transmitted to a second power supply integral voltage regulator module UB for power signal processing.

[0118] The second surge discharge unit is connected to the second communication interface and is used to limit the overvoltage and discharge surge current generated when the second communication interface acquires signals.

[0119] The third rectifier and filter unit is connected between the first communication interface and the second electrostatic protection unit. It is used to convert the alternating signal obtained by the first communication interface into a pulsating DC voltage and provides auxiliary protection against impacts.

[0120] The second transient noise suppression module DB has the same function as the first transient noise suppression module DA. It is located at the other end of the magnetic coupling conversion unit U0 and is used to filter out transient noise from the second communication port.

[0121] like Figures 2 to 3 As shown, specifically, the second transient noise suppression module DB includes a second surge discharge unit connected to the second communication interface. The third rectifier and filter unit is connected between the first communication interface and the second electrostatic protection unit. One end of the second electrostatic protection unit is connected to the third rectifier and filter unit, and the other end is connected to the magnetic coupling conversion unit U0 through the second signal channel noise suppression unit. By suppressing transient noises such as lightning surges, EFTs, and electrostatic discharges from the second communication interface device, it partially protects against high-voltage continuous noise. The power supply and signal with filtered transient noise are respectively sent to the second power supply integral voltage regulator module UB and the magnetic coupling conversion unit U0, achieving complete signal isolation and improving transmission performance.

[0122] Specifically, the second surge discharge unit includes a capacitor CGB and an electronic resistor RGB. One end of the capacitor CGB is connected to pin 5 of the second communication interface, and the other end is connected to pins 10 and 11 of the second communication interface. One end of the resistor RGB is connected to pin 5 of the second communication interface, and the other end is connected to pins 10 and 11 of the second communication interface. The capacitor CGB and the resistor RGB are connected in parallel. The ends of the capacitor CGB and the resistor RGB connected to pin 11 of the second communication interface are connected to the mechanical ground of the housing.

[0123] By setting up a second electrostatic protection unit and a second signal channel suppression unit, the noise current generated during signal transmission is clipped and suppressed.

[0124] Pin 2 of the third rectifier and filter unit U3B is connected to pin 5 of the third rectifier and filter unit U3B, pin 3 of U3B is left floating, pin 4 of U3B is connected to pin 1 of U3B, and pin 6 of U3B is connected to pins 7 and 8 of the second communication interface.

[0125] Specifically, such as Figure 3As shown, the second electrostatic discharge protection unit includes diode D1B and diode D2B. One end of diode D2B is connected to pin 3 of the second communication interface, and the other end of diode D2B is connected to pin 5 of the second communication interface. The connection end of diode D2B and pin 5 of the second communication interface is grounded. One end of diode D1B is connected to the other end of diode D2B, and the other end of diode D1B is connected to pin 2 of the first communication interface, thereby achieving the clamping of abnormal high voltage in the circuit during transmission.

[0126] The second signal channel noise suppression unit includes resistors R1B and R2B and a ferrite bead L1B. One end of the ferrite bead L1B is grounded, and the other end is connected to pin 5 of the magnetic coupling conversion unit U0. Resistor R1B is connected to pin 2 of the first communication interface, and the other end is connected to pin 7 of the magnetic coupling conversion unit U0. Resistor R2B is connected to the first communication interface 3, and the other end is connected to pin 6 of the magnetic coupling conversion unit U0, thereby suppressing signal noise.

[0127] Furthermore, the second power supply integral voltage regulator module UB includes a second low-voltage voltage regulator unit and a second high-frequency noise filter unit.

[0128] The second low-voltage regulator unit is connected to the second communication interface and the second transient noise suppression module, and is used to receive the power signal transmitted by the second transient noise suppression module to stabilize the output voltage.

[0129] One end of the second high-frequency noise filtering unit is connected to the second low-voltage regulator unit, and the other end is connected to the second power supply terminal of the magnetic coupling converter unit. It is used to suppress common-mode noise and differential-mode noise in the output power signal of the second low-voltage regulator unit and transmit it to the other end of the magnetic coupling converter unit.

[0130] The second voltage regulator unit includes an adjustable voltage regulator TL431 for adjusting the voltage.

[0131] The second low-voltage regulator unit and the second high-frequency noise filter unit have the same technical effects as the first low-voltage regulator unit and the first high-frequency noise filter unit, and will not be described further here.

[0132] Furthermore, the second power supply integral voltage regulator module UB also includes a fourth rectification and filtering unit and a second current-limiting integral energy storage unit.

[0133] The fourth rectifier and filter unit is connected to the second electrostatic protection unit. It is used to absorb and convert the alternating signal processed by the second transient noise suppression module into a pulsating DC voltage, and has an auxiliary protection effect against impacts.

[0134] The second current-limiting integral energy storage unit is connected between the fourth rectifier and filter unit and the second low-voltage regulator unit. It is used to store the power signal absorbed by the third rectifier and filter unit to avoid the input energy being too strong or too weak.

[0135] like Figure 2 As shown, by setting the second power supply integral voltage regulator module UB to rectify and integrate the current of the power supply at the second communication interface end when the power supply signal with filtered noise is transmitted to the second power supply end of the magnetic coupling conversion unit U0 through the second transient noise suppression module DB, the second power supply integral voltage regulator module UB achieves complete isolation of the power supply signals at both ends.

[0136] The third rectifier filter unit and electrostatic discharge protection unit are multi-channel integrated diode arrays U1B and U3B.

[0137] Specifically, such as Figure 3 As shown, pin 1 of the fourth rectifier filter unit U1B is grounded, pin 6 of U1B is connected to pins 1, 4, and 6 of the second communication interface, pin 2 of U1B is connected to the power network VCC2, pin 5 of U1B is connected to pin 2, pin 3 of U1B is connected to pin 3 of the second communication interface, pin 4 of U1B is connected to pin 1 of U1B, and is grounded.

[0138] The second current-limiting integral energy storage unit includes resistor R5B, resistor R6B, and capacitor C1B. One end of resistor R5B is connected to the power network VCC2 and one end of diode D3B, respectively. The other end of diode D3B is grounded. Diode D3B is connected in parallel with resistor R5B. The other end of resistor R5B is connected in series with resistor R6B. The other end of resistor R6B is connected in series with capacitor C1B. The other end of capacitor C1B is grounded.

[0139] The second current-limiting integral energy storage unit can be directly connected to the second transient noise suppression module according to different needs, and directly store and transmit power signals. The third rectification and filtering unit can be connected in parallel with the second current-limiting integral energy storage unit in the second power integral voltage regulator module according to different needs, and is used to prevent electrostatic discharge (ESD) from occurring when objects with different electrostatic potentials approach or directly contact the second power integral voltage regulator module UB. The third rectification and filtering unit and the fourth rectification and filtering unit are multi-channel integrated diode arrays U3B and U1B.

[0140] The second low-voltage regulator unit includes resistors R3B, R4B, R5B, and U2B. One end of resistor R3B is connected to the other end of resistor R5B, and the other end of resistor R3B is connected in series with resistor R4B. The other end of resistor R4B is grounded. The connection end of resistors R3A and R4A is connected to the reference electrode of the voltage regulator TL431. The cathode of the voltage regulator is connected to the other end of resistor R3A, and the anode of the voltage regulator is grounded.

[0141] The second high-frequency noise filtering unit includes an inductor L2B and a capacitor C2B. The inductor L2B is connected to the cathode of the voltage regulator TL431. The connection point between the inductor L2B and the cathode of the voltage regulator is connected to the power network VCCB. The other end of the inductor L2B is connected in series with the capacitor C2B. The other end of the capacitor C2B is connected to pin 5 of the magnetic coupling conversion unit U0. The connection point between the inductor L2B and the capacitor C2B is connected to pin 8 of the magnetic coupling conversion unit U0. A diode D4B is connected in parallel across the two ends of the capacitor C2B. One end of the diode D4B is grounded to the connection point of C2B.

[0142] Preferably, the diode D4B is a secondary electrostatic discharge (ESD) protection TVS.

[0143] The labels VCC1, VCC2, VCCA, and VCCB used in this article are merely names of virtual potential circuit networks and do not refer to actual physical power sources.

[0144] like Figure 1-3 As shown, this invention, by setting up a second transient noise suppression module DB and a second power supply integral voltage regulator module UB, enables the high-speed serial signal at the second communication interface to be transmitted and received on both sides of the high-speed serial signal through the magnetic coupling conversion unit U0, in conjunction with the first transient noise suppression module DA and the first power supply integral voltage regulator module DA. This filters out possible transient noise interference, partially suppresses continuous noise interference, and ensures the stability of high-speed signal transmission via magnetic coupling. It also provides complete isolation between different interconnected devices connected by wires, from power supply and signal to common reference ground, minimizing power supply and signal ground loop noise to the lowest possible level (the loop area is almost non-existent). Therefore, it greatly reduces the mutual coupling effect of power supply and signal ground loop noise. At the same time, a reliable noise suppression circuit is designed to suppress the interference and influence of noise (including surge, EFT, ESD, power frequency voltage, etc.) from the above signal ports on other devices. The structure is simple, low-cost, and small in size.

[0145] The advantage of this invention is that it completely isolates the signal power supplies on both interconnected sides, eliminating the need for isolated power conversion modules that couple the two sides; instead, the voltage generated by the accumulation of the respective signal currents is sufficient. Furthermore, this invention uses a highly integrated power supply and diode array, employing a common adjustable voltage regulator TL431, resulting in a smaller size and lower cost.

[0146] The above description is merely one embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been described above with reference to typical embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A communication interface isolation and protection device, characterized in that: include, The first communication interface is used to acquire high-speed serial signals; The second communication interface is used to acquire high-speed serial signals; The first transient noise suppression module is connected to the first communication interface and is used to receive the signal acquired by the first communication interface and filter out transient noise in the signal. The first power supply integral voltage regulator module is connected to the first transient noise suppression module and is used to rectify and integrate the weak current in the signal after the noise has been filtered out by the first transient noise suppression module. The second transient noise suppression module is connected to the second communication interface and is used to receive the signal acquired by the second communication interface and filter out transient noise in the signal. The second power supply integral voltage regulator module is connected to the second transient noise suppression module and is used to rectify and integrate the weak current in the signal after the noise has been filtered out by the second transient noise suppression module. The magnetic coupling conversion unit receives data signals and power signals processed by the first transient noise suppression module and the first power supply integral voltage regulation module at one end, and receives data signals and power signals processed by the second transient noise suppression module and the second power supply integral voltage regulation module at the other end, and is used to transmit the data signals received at both ends to the corresponding ends. The magnetic coupling transformation unit includes, The first signal terminal is connected to the first transient noise suppression module and is used to receive the data signal processed by the first transient noise suppression module. The first power supply terminal is connected to the first power supply integral voltage regulator module and is used to receive the power signal after it has been processed and stabilized by the first power supply integral voltage regulator module. The second signal terminal is connected to the second transient noise suppression module and is used to receive the data signal processed by the second transient noise suppression module. The second power supply terminal is connected to the second power supply integral voltage regulator module and is used to receive the stable power supply signal processed by the second power supply integral voltage regulator module. The conversion module is used to transmit the data signal from the first signal terminal and the data signal from the second signal terminal bidirectionally.

2. The communication interface isolation and protection device according to claim 1, characterized in that: The first transient noise suppression module includes, The first electrostatic protection unit is used to clamp abnormal high voltages in the transmission process of the signal obtained by the first communication interface to a safe level during the transmission of the first transient noise suppression module. The first signal channel noise suppression unit is connected at one end to the first electrostatic protection unit and at the other end to one end of the magnetic coupling conversion unit. It is used to receive the data signal acquired by the first electrostatic protection unit, suppress the common-mode noise in the data signal, and transmit it to one end of the magnetic coupling conversion unit.

3. The communication interface isolation and protection device according to claim 2, characterized in that: The first transient noise suppression module also includes, The first surge discharge unit is connected to the first communication interface and is used to limit the overvoltage and discharge surge current generated when the first communication interface acquires signals. The first rectifier and filter unit is connected between the first communication interface and the first electrostatic protection unit. It is used to convert the alternating signal obtained by the first communication interface into a pulsating DC voltage and provides auxiliary protection against impacts.

4. The communication interface isolation and protection device according to claim 3, characterized in that: The first rectifier and filter unit is a multi-channel integrated diode array U3A.

5. A communication interface isolation and protection device according to claim 2, characterized in that: The first power supply integral voltage regulator module includes, The first low-voltage regulator unit is connected to the first transient noise suppression module and is used to receive the power signal transmitted by the first transient noise suppression module and stabilize the output voltage. The first high-frequency noise filtering unit is connected to the first low-voltage regulator unit, and its other end is connected to one end of the magnetic coupling conversion unit. It is used to suppress common-mode noise and differential-mode noise in the output power signal of the first low-voltage regulator unit and transmit it to one end of the magnetic coupling conversion unit.

6. A communication interface isolation and protection device according to claim 5, characterized in that: The first low-voltage regulator unit includes an adjustable voltage regulator TL431.

7. A communication interface isolation and protection device according to claim 5, characterized in that: The first power supply integral voltage regulator module also includes, The second rectifier and filter unit is connected to the first electrostatic protection unit. It is used to absorb and convert the alternating signal processed by the first transient noise suppression module into a pulsating DC voltage, and has an auxiliary protection effect against impacts. The first current-limiting integral energy storage unit is connected between the second rectifier and filter unit and the first low-voltage regulator unit. It is used to store the power signal absorbed by the second rectifier and filter unit and transmit it to the first low-voltage regulator unit.

8. A communication interface isolation and protection device according to claim 7, characterized in that: The second rectifier and filter unit is a multi-channel integrated diode array U1A.

9. A communication interface isolation and protection device according to any one of claims 1-8, characterized in that: The second transient noise suppression module includes, The second electrostatic protection unit is used to clamp abnormal high voltage to a safe level during the transmission of the signal obtained by the second communication interface through the second transient noise suppression module. The second signal channel noise suppression unit is connected at one end to the second electrostatic protection unit and at the other end to the other end of the magnetic coupling conversion unit. It is used to receive the data signal acquired by the second electrostatic protection unit, suppress the common-mode noise in the data signal, and transmit it to the other end of the magnetic coupling conversion unit.

10. A communication interface isolation and protection device according to claim 9, characterized in that: The second transient noise suppression module also includes, The second surge discharge unit is connected to the second communication interface and is used to limit the overvoltage and discharge the surge current generated when the second communication interface acquires signals. The third rectifier and filter unit is connected between the first communication interface and the second electrostatic protection unit. It is used to convert the alternating signal obtained by the first communication interface into a pulsating DC voltage and provides auxiliary protection against impacts.

11. A communication interface isolation and protection device according to claim 9, characterized in that: The second power supply integral voltage regulator module includes, The second low-voltage regulator unit is connected to the second transient noise suppression module and is used to receive the power signal transmitted by the second transient noise suppression module to stabilize the output voltage. The second high-frequency noise filtering unit is connected at one end to the second low-voltage regulator unit and at the other end to the other end of the magnetic coupling converter unit. It is used to suppress common-mode noise and differential-mode noise in the output power signal of the second low-voltage regulator unit and transmit it to the other end of the magnetic coupling converter unit.

12. A communication interface isolation and protection device according to claim 11, characterized in that: The second low-voltage regulator unit includes an adjustable voltage regulator TL431.

13. A communication interface isolation and protection device according to claim 11, characterized in that: The second power supply integral voltage regulator module also includes, The fourth rectifier and filter unit is connected to the second electrostatic protection unit. It is used to absorb and convert the alternating signal processed by the second transient noise suppression module into a pulsating DC voltage, and has an auxiliary protection effect against impacts. The second current-limiting integral energy storage unit is connected between the fourth rectifier and filter unit and the second low-voltage regulator unit. It is used to store the power signal absorbed by the fourth rectifier and filter unit and transmit it to the second low-voltage regulator unit.

Images