CN218829607U

CN218829607U - Communication interface isolation protection device

Info

Publication number: CN218829607U
Application number: CN202221526620.5U
Authority: CN
Inventors: 南原; 赵德良
Original assignee: Jilin Donghuayuan Medical Equipment Co ltd
Current assignee: Jilin Donghuayuan Medical Equipment Co ltd
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2023-04-07
Anticipated expiration: 2032-06-17

Abstract

The utility model discloses a protector is kept apart to communication interface, include, first communication interface, second communication interface, magnetic coupling transform unit, first transient state noise suppression module, first power integral voltage stabilizing module and second transient state noise suppression module, second power integral voltage stabilizing module. The utility model discloses first transient state noise suppression module and second transient state noise suppression module, suppress interface device's thunderbolt surge, transient state noise such as EFT and static, the continuous noise of part protection high pressure, give first power point steady voltage module respectively with filtering transient state noise's signal and data signal, second power point steady voltage module and magnetic coupling transform unit, then first power point steady voltage module and second power point steady voltage module are responsible for the weak current rectification with on the communication line, point and steady voltage to magnetic coupling transform unit, the magnetic coupling transform unit exchanges the data signal at both ends, realize the signal power supply thorough isolation of both sides, moreover, the steam generator is simple in structure, and the production cost is saved.

Description

Communication interface isolation protection device

Technical Field

The utility model belongs to the technical field of communication, specifically speaking relates to a protector is kept apart to communication interface.

Background

The prior art RS232 bus isolation method is an optocoupler technology that uses a light beam to isolate and protect the detection circuit and to provide a safe interface between the high and low voltage electrical environments. When one of the devices is impacted or influenced by lightning strike, surge, electrical fast passing pulse group EFT, electrostatic ESD, high voltage power line contact or power line coupling and other transient or continuous large voltage and large current interferences, strong interference noise inevitably flows from the device subjected to strong interference to other devices along the interconnection cable because of the direct interconnection of the common ground and the signal line between the devices, and the normal operation of the devices is damaged or influenced.

The Chinese patent with the application number of CN 210324194U discloses a communication interface magnetic coupling isolation protection circuit, wherein an ADUM1201ARZ IS used as a magnetic coupling chip, a domestic CA-IS3721HS or pi 121M31 IS used in the scheme, the price advantage IS obvious, and the performance price ratio of isolation safety, data transmission rate and the like IS higher; the isolation power supply of the scheme of Nanjing Autong selects the magnetically isolated DC-DC module F03058-1WR2, has large volume and incomplete isolation, and the circuits on two sides of the isolation have interference coupling of the power supply, so that the requirements of EMC on more and more strict requirements are not enough to meet the requirements of EMC of sensitive interconnected products today, the thorough isolation of signal power supplies on two sides cannot be realized, and an independent power supply needs to be arranged, the structure is complex, and the transmission signal is poorer.

In view of this, the present invention is provided.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome the deficiency of the prior art, provide a communication interface isolation protector, and set up the first transient state noise suppression module in the circuit, the second transient state noise suppression module, when communication interface transmission information, be used for suppressing the lightning stroke surge that comes from external serial port equipment, transient state noise such as EFT and static, the high voltage continuous noise of partial protection, send the power and the signal of filtering transient state noise to the both ends of first power integral voltage stabilizing module, second power integral voltage stabilizing power supply and magnetic coupling transform unit respectively; the first power supply integral voltage stabilizing module and the second power supply integral voltage stabilizing module are responsible for rectifying, integrating and stabilizing weak current on the communication line to the magnetic coupling conversion unit, and the magnetic coupling conversion unit is responsible for receiving, transmitting and converting high-speed serial signals on two sides, filtering out possible transient interference, ensuring the stability of magnetic coupling transmission high-speed signals and realizing thorough isolation of signal power supplies on two sides of interconnection and intercommunication.

In order to solve the technical problem, the utility model adopts the technical scheme that: a communication interface isolation protection device comprises a communication interface,

the first communication interface is used for acquiring a high-speed serial signal;

the second communication interface is used for acquiring a high-speed serial signal;

the first transient noise suppression module is connected with the first communication interface and used for receiving the signal acquired by the first communication interface and filtering transient noise in the signal;

the first power supply integration voltage stabilization module is connected with the first transient noise suppression module and used for rectifying and integrating weak current in the received signal subjected to noise filtering by the first transient noise suppression module;

the second transient noise suppression module is connected with the second communication interface and used for receiving the signal acquired by the first communication interface and filtering transient noise in the signal;

the second power integration voltage stabilization module is connected with the second transient noise suppression module and used for rectifying and integrating weak current in the received signal subjected to noise filtering by the second transient noise suppression module;

and one end of the magnetic coupling conversion unit is used for respectively receiving the data signals and the power signals processed by the first transient noise suppression module and the first power integration voltage stabilization module, and the other end of the magnetic coupling conversion unit is used for respectively receiving the data signals and the power signals processed by the second transient noise suppression module and the second power integration voltage stabilization module, and correspondingly transmitting the data signals received at the two ends to the opposite end.

The first transient noise suppression module may include,

the first electrostatic protection unit is used for clamping abnormal high voltage of a signal acquired by the first communication interface in the transmission process of the first transient noise suppression module within a safety level;

and one end of the first signal channel noise suppression unit is connected with the first electrostatic protection unit, and the other end of the first signal channel noise suppression unit is connected with one end of the magnetic coupling conversion unit, and is used for receiving the data signal acquired by the first electrostatic protection unit, suppressing the common-mode noise in the data signal and transmitting the common-mode noise to one end of the magnetic coupling conversion unit.

Further, the first transient noise suppression module further comprises,

the first surge discharging unit is connected with the first communication interface and used for limiting overvoltage and discharging surge current generated when the first communication interface acquires signals;

the first rectifying and filtering unit is connected between the first communication interface and the first electrostatic protection unit, and is used for converting an alternating signal obtained by the first communication interface during signal transmission into a pulsating direct-current voltage and has an auxiliary protection effect on impact;

preferably, the first rectifying and filtering unit is a multi-path integrated diode array U3A.

Further, the first power integrating and voltage stabilizing module comprises,

the first low-voltage stabilizing unit is connected with the first transient noise suppression module and used for receiving the power supply signal transmitted by the first transient noise suppression module and stabilizing the output voltage;

the first high-frequency noise filtering unit is connected with the first low-voltage stabilizing unit, the other end of the first high-frequency noise filtering unit is connected with one end of the magnetic coupling conversion unit, and the first high-frequency noise filtering unit is used for suppressing common mode noise and differential mode noise in an output power supply signal in the first low-voltage stabilizing unit and transmitting the common mode noise and the differential mode noise to one end of the magnetic coupling conversion unit;

preferably, the first low-voltage regulator unit comprises a regulated voltage regulator TL431.

The second rectifying and filtering unit is connected with the first electrostatic protection unit and used for absorbing and converting the alternating signals processed by the first transient noise suppression module into pulsating direct-current voltage and has an auxiliary protection effect on impact;

the first current-limiting integral energy storage unit is connected between the second rectifying and filtering unit and the first low-voltage stabilizing unit and is used for storing the power supply signal absorbed by the second rectifying and filtering unit and transmitting the power supply signal to the first low-voltage stabilizing unit;

preferably, the second rectifying and filtering unit is a multi-path integrated diode array U1A.

Further, the second transient noise suppression module includes,

the second electrostatic protection unit is used for clamping the abnormal high voltage of the signal acquired by the second communication interface within a safe level in the transmission process of the second transient noise suppression module;

and one end of the second signal channel noise suppression unit is connected with the second electrostatic protection unit, and the other end of the second signal channel noise suppression unit is connected with the other end of the magnetic coupling conversion unit, and is used for receiving the data signal acquired by the second electrostatic protection unit, suppressing the common-mode noise in the data signal and transmitting the common-mode noise to the other end of the magnetic coupling conversion unit.

Further, the second transient noise suppression module further comprises,

the second surge discharging unit is connected with the second communication interface and used for limiting overvoltage and discharging surge current generated when the second communication interface acquires signals;

and the third rectifying and filtering unit is connected between the first communication interface and the second electrostatic protection unit, and is used for converting an alternating signal obtained by the first communication interface during signal transmission into a pulsating direct current voltage and has an auxiliary protection effect on impact.

Further, the second power integrating and voltage stabilizing module comprises,

the second low-voltage stabilizing unit is connected with the second transient noise suppression module and used for receiving the power supply signal transmitted by the second transient noise suppression module and stabilizing the output voltage;

one end of the second high-frequency noise filtering unit is connected with the second low-voltage stabilizing unit, the other end of the second high-frequency noise filtering unit is connected with the other end of the magnetic coupling conversion unit, and the second high-frequency noise filtering unit is used for suppressing common mode noise and differential mode noise in an output power supply signal in the second low-voltage stabilizing unit and transmitting the common mode noise and the differential mode noise to the other end of the magnetic coupling conversion unit;

preferably, the second low-voltage regulator unit includes a regulated voltage regulator TL431.

Further, the second power integrating and voltage stabilizing module further comprises,

the fourth rectifying and filtering unit is connected with the first electrostatic protection unit and used for absorbing and converting the alternating signals processed by the first transient noise suppression module into pulsating direct-current voltage and has an auxiliary protection effect on impact;

and the second current-limiting integral energy storage unit is connected between the fourth rectifying and filtering unit and the second low-voltage stabilizing unit and is used for storing the power supply signal absorbed by the fourth rectifying and filtering unit and transmitting the power supply signal to the second low-voltage stabilizing unit.

Furthermore, the second power integrating and voltage stabilizing module further comprises an electrostatic discharge protection unit connected between the third rectifying and filtering unit and the second current-limiting integrating and energy-storing unit, and used for preventing the second power integrating and voltage stabilizing module from generating electrostatic discharge (ESD) when objects with different electrostatic potentials are close to or directly contact with each other;

the third rectifying and filtering unit is a multi-path integrated diode array U1B, and the electrostatic discharge protection unit is a multi-path integrated diode array U3B.

Further, the magnetic coupling conversion unit includes,

the first signal end is connected with the first transient noise suppression module and used for receiving the data signal processed by the first transient noise suppression module;

the first power supply end is connected with the first power integration voltage stabilizing module and used for receiving the power supply signal processed and stabilized by the first power integration voltage stabilizing module;

the second signal end is connected with the second transient noise suppression module and used for receiving the data signal processed by the second transient noise suppression module;

the second power supply end is connected with the second power integration voltage stabilizing module and used for receiving the stabilized power supply signal processed by the second power integration voltage stabilizing module;

and the conversion module is used for carrying out bidirectional transmission on the data signal of the first signal end and the data signal of the second signal end.

After the technical scheme is adopted, compared with the prior art, the utility model following beneficial effect has.

(1) The utility model discloses a set up first transient state noise suppression module in the device, second transient state noise suppression module and first power integral steady voltage module and second power integral steady voltage module, when communication interface transmission information, first transient state noise suppression module, second transient state noise suppression module, be used for suppressing first communication interface respectively, when the transmission of second communication interface, come from the lightning stroke surge of external serial port equipment, transient noise such as EFT and static, partly protect high-pressure continuous noise, give first power integral steady voltage module, second power integral steady voltage module and magnetic coupling transform unit with the power and the signal of filtering transient state noise among first communication interface and the second communication interface respectively, then first power integral steady voltage module, second power integral steady voltage module is responsible for the little weak current rectification on the signal line, after the magnetic coupling integral and steady voltage reach the steady power that high-speed magnetic isolation chip needs, give the power end of magnetic coupling transform unit, the high-speed serial signal of both sides is responsible for receiving and dispatching transform to the magnetic coupling transform, and possible transient state interference of magnetic coupling, guarantee the high-speed signal's of transmission stability.

(2) The utility model realizes the thorough isolation of the signal power supplies at two sides which are interconnected and intercommunicated, does not use the isolation power supply conversion modules at two sides of the coupling, and uses the voltage generated by the accumulation of respective signal current to be enough; on the other hand, the utility model discloses use high integrated power and diode array, use ordinary adjustable power TL431 for the volume is littleer, and the price is lower.

The following describes embodiments of the present invention in further detail with reference to the attached drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, the illustrative embodiments and the description of the invention serve to explain the invention without unduly limiting the invention. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

fig. 1 is a flow chart of a communication interface isolation protector of the present invention;

fig. 2 is a flow chart of the communication interface isolation protector of the present invention;

fig. 3 is a schematic circuit diagram of the communication interface isolation protector of the present invention.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments, and the following embodiments are used for illustrating the present invention, but do not limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to fig. 3, a communication interface isolation protection device, including first communication interface, second communication interface, magnetic coupling transform unit U0, first transient noise suppression module DA, first power integration voltage stabilization module UA and second transient noise suppression module DB, second power integration voltage stabilization module UB.

The first communication interface is used for acquiring a high-speed serial signal.

The second communication interface is used for acquiring a high-speed serial signal.

One end of the first transient noise suppression module DA is connected with the first communication interface and is used for receiving the signal acquired by the first communication interface and filtering transient noise in the signal.

One end of the first power integration voltage stabilization module UA is connected with the first transient noise suppression module DA and used for rectifying and integrating weak current in the received signal subjected to noise filtering by the first transient noise suppression module DA.

And the second transient noise suppression module DB is connected with the second communication interface and is used for receiving the signal acquired by the second communication interface and filtering transient noise in the signal.

And the second power integration voltage stabilization module UB is connected with the second transient noise suppression module DB and is used for rectifying and integrating the weak current in the received signal subjected to noise filtering by the second transient noise suppression module DB.

One end of the magnetic coupling conversion unit U0 receives the data signal and the power signal processed by the first transient noise suppression module DA and the first power integration voltage stabilization module UA, respectively, and the other end receives the data signal and the power signal processed by the second transient noise suppression module DB and the second power integration voltage stabilization module UB, respectively, and is configured to correspondingly transmit the data signals received at the two ends to the opposite ends, respectively.

The utility model discloses a set up first transient state noise suppression module DA, second transient state noise suppression module DB in the device, when communication interface received signal, be used for suppressing transient state noise such as thunderbolt surge, EFT and static that come from external serial port equipment, the continuous noise of part protection high pressure, power signal and data signal with the filtering transient state noise send first power integration steady voltage module UA, second power integration steady voltage module UB and magnetic coupling transform unit U0 respectively; after the first power integration voltage stabilization module UA and the second power integration voltage stabilization module UB are responsible for rectifying, integrating and stabilizing weak current on a signal line to a stable power supply required by a high-speed magnetic isolation chip, the magnetic coupling conversion unit U0 is responsible for receiving, transmitting and converting high-speed serial signals on two sides, filtering out possible transient interference, ensuring the stability of magnetic coupling transmission high-speed signals and solving the defect that isolation communication cannot completely isolate power supply noise.

The magnetic coupling conversion unit U0 IS a dual-channel digital isolator CA-IS3721HS.

Further, the magnetic coupling transformation unit U0 includes a first signal terminal, a first power supply terminal, a second signal terminal, a second power supply terminal, and a transformation module.

The first signal end is connected with the first transient noise suppression module DA and used for receiving the data signal processed by the first transient noise suppression module DA.

The first power end is connected with the first power integration voltage stabilization module UA and used for receiving a stabilized power supply signal processed by the first power integration voltage stabilization module UA.

And the second signal terminal is connected with the second transient noise suppression module DB and is used for receiving the data signal processed by the second transient noise suppression module DB.

And the second power supply end is connected with the second power integration voltage-stabilizing module UB and is used for receiving the stabilized power supply signal processed by the second power integration voltage-stabilizing module UB.

The conversion module is used for carrying out bidirectional transmission on the data signal of the first signal end and the data signal of the second signal end.

The utility model discloses a with first transient state noise suppression module DA, second transient state noise suppression module DB and magnetic coupling transform unit U0's first signal end, the second signal end is connected, with first power integral voltage stabilization module UA second power integral voltage stabilization module UB and magnetic coupling transform unit U0's first power end, the second power end is connected, when transmitting signals, first transient state noise suppression module DA, second transient state noise suppression module DB is at first with the thunderbolt surge from outside serial devices, transient noises such as EFT and static, partly protect high-pressure continuous noise, give first power integral voltage stabilization module UA with the power of filtering transient noise, second integral voltage stabilization module UB, data signal sends the first power end to magnetic coupling transform unit U0, the second signal end, then first power integral voltage stabilization module UA, the little weak current rectification on the signal line of second power integral voltage stabilization module UB, integral and voltage stabilization to the first power end of magnetic coupling transform unit U0, then the second power end, then the transform unit U0 passes through the magnetic coupling transform unit, the high-speed magnetic coupling transform unit UB can not only satisfy the high-speed magnetic coupling transform unit magnetic coupling transform the volume noise of high-speed transmission and the high-speed communication isolation, the high-speed noise isolation requirement has been realized, the high-speed noise isolation requirement of the high-speed noise isolation, the high-speed noise isolation is realized.

The power supply signal in the present invention is not limited to the power supply current or the power supply voltage.

Further, the first transient noise suppression module DA includes a first electrostatic protection unit and a first signal path suppression unit.

The first electrostatic protection unit is used for clamping the abnormal high voltage of the signal acquired by the first through interface in the transmission process of the first transient noise suppression module DA within a safe level.

One end of the first signal channel noise suppression unit is connected with the first electrostatic protection unit, and the other end of the first signal channel noise suppression unit is connected with one end of the magnetic coupling conversion unit, and the first signal channel noise suppression unit is used for receiving the data signals acquired by the first electrostatic protection unit, suppressing common-mode noise in the data signals, and transmitting the common-mode noise to one end of the magnetic coupling conversion unit.

The first electrostatic protection unit and the first signal channel suppression unit are arranged to carry out peak clipping suppression on generated noise current during signal transmission, the first signal channel suppression unit is composed of resistors R1A and R2A and a magnetic bead L1A which are connected in series between an input signal and the magnetic coupling conversion unit U0, the power and the resistance value of the first signal channel suppression unit are related to the intensity of input environmental noise and the load U0 unit, and the power and the resistance value of the first signal channel suppression unit can be between 300 and 1k frequently.

Specifically, the first electrostatic protection unit comprises a diode D1A and a diode D2A, one end of the diode D1A is connected with a pin 3 of the first communication interface, the other end of the diode D1A is connected with a pin 5 of the first communication interface, a pin 1 of the multi-path integrated diode array U3A and a pin 4 of the U3A, one end of the diode D2A is connected with the other end of the diode D1A and the pin 5 of the first communication interface, the connection end of the diode D2A and the pin 5 of the first communication interface is connected with the pin 1 of the multi-path integrated diode array U3A and the pin 4 of the U3A, and the other end of the diode D2A is connected with the pin 2 of the first communication interface.

The first signal channel noise suppression unit comprises resistors R1A and R2A and a magnetic bead L1A, the magnetic bead L1A is connected with a pin 1 of a multi-path integrated diode array U3A, the other end of the magnetic bead L1A is connected with a pin 4 of a magnetic coupling conversion unit U0, the resistor R1A is connected with a pin 2 of a first communication interface, the other end of the resistor R1A is connected with a pin 2 of the magnetic coupling conversion unit U0, the resistor R2A is connected with a first communication interface 3, and the other end of the resistor R2A is connected with a pin 2 of the magnetic coupling conversion unit U0.

The utility model discloses but not limited to use two sets of common mode inductance and electric capacity (2 feet and 5 feet are one set, 3 feet and 5 feet are one set) to cooperate suitable filter circuit (C type, gamma type or pi type) between R1A and R2A's preceding stage and 5 feet, restrain common mode noise; the level conversion unit can also be used for completing reliable level conversion; the application of fig. 3 is a basic application, and is suitable for the situation that the electromagnetic noise is relatively clean, which is common in the environmental situation.

Preferably, the first transient noise suppression module DA further includes a first surge relief unit and a first rectifying and filtering unit.

The first surge discharging unit is connected with the first communication interface and used for limiting overvoltage and discharging surge current generated when the first communication interface acquires the signal.

The first rectifying and filtering unit is connected between the first communication interface and the first electrostatic protection unit, and is used for absorbing and converting alternating signals obtained by the first communication interface during signal transmission into pulsating direct-current voltage and has an auxiliary protection effect on impact.

The utility model discloses a set up first surge in first transient state noise suppression module DA and unload unit, first rectification filtering unit, when using, when the unit is unloaded through first surge to the signal of first communication interface, avoids when beginning, and it is too high in the twinkling of an eye to produce voltage, causes the damage to follow-up circuit, and the signal that is following high-speed transmission is through first rectification filtering unit, absorbs the high voltage pulse of low energy that takes place on the circuit in the twinkling of an eye, protects the safety of follow-up circuit.

Specifically, as shown in fig. 3, 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, the other end of the capacitor CGA is connected to pin 10 and pin 11 of the first communication interface, one end of the resistor RGA is connected to pin 5 of the first communication interface, the other end of the resistor RGA is connected to pin 10 and pin 11 of the first communication interface, the capacitor CGA is connected in parallel to the resistor RGA, and one end of the capacitor CGA, which is connected to pin 11 of the first communication interface, and the capacitor CGA is mechanically connected to the housing.

The utility model discloses in contain but not limited to the interface design of the formula common mode ground connection that floats of all non-shielding casings, wherein CGA's 680pF can be according to the frequency spectrum frequency-selecting requirement of different purposes such as EMI harassment, EMS reposition of redundant personnel, between selecting or selecting 100pF ~ 4700 pF.

The first rectifying and filtering unit comprises a multi-path integrated diode array U3A, a pin 3 of the multi-path integrated diode array U3A is connected with a pin 7 and a pin 8 of the first communication interface, a pin 2 of the multi-path integrated diode array U3A is connected with a pin 5, a connecting end is connected with a power supply network VCC1, a pin 4 of the multi-path integrated diode array U3A is grounded, a pin 6 of the multi-path integrated diode array U3A is arranged in a hanging mode, and a pin 1 of the multi-path integrated diode array U3A is grounded and is connected with the first signal channel noise suppression unit.

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

The first low-voltage stabilizing unit is connected with the first transient noise suppression module DA and used for receiving the power supply signal transmitted by the first transient noise suppression module DA and stabilizing the output voltage.

The first high-frequency noise filtering unit is connected with the first low-voltage stabilizing unit, the other end of the first high-frequency noise filtering unit is connected with one end of the magnetic coupling conversion unit, and the first high-frequency noise filtering unit is used for suppressing common mode noise and differential mode noise in an output power supply signal in the first low-voltage stabilizing unit and transmitting the common mode noise and the differential mode noise to one end of the magnetic coupling conversion unit.

Preferably, the first low-voltage regulator unit includes a regulated voltage regulator TL431.

The first low-voltage stabilizing unit is connected with the first transient noise suppression module DA, the power signal with the transient noise filtered is subjected to voltage stabilizing output through the adjustable voltage stabilizing source TL431, then the stable power signal is subjected to common mode noise and differential mode noise filtering in the stable power signal through the first high-frequency noise filtering unit, and the power signal is sent to the first power supply end of the magnetic coupling conversion unit, so that transmission of the power signal is achieved.

The second rectifying and filtering unit is connected with the first electrostatic protection unit and used for absorbing and converting alternating signals processed by the first transient noise suppression module DA into pulsating direct-current voltage and has an auxiliary protection effect on impact.

The first current-limiting integral energy storage unit is connected between the second rectifying and filtering unit and the first low-voltage stabilizing unit and used for storing the power supply signal absorbed by the second rectifying and filtering unit and transmitting the power supply signal to the first low-voltage stabilizing unit.

The utility model discloses an in-process to power signal transmission, add second rectification filtering unit and first current-limiting integral energy storage unit, improve the stability of power signal in the transmission, power signal is when second rectification filtering unit, it is pulsation direct current voltage to absorb conversion alternating signal, and there is the auxiliary protection effect to the impact, then power signal after first current-limiting integral energy storage unit is converted stores, then transmit to first low pressure voltage regulator unit, avoid the voltage among the first low pressure regulator unit of input too strong or weak, the security and the stability of improving the device operation.

The first current-limiting integral energy storage unit can also be directly connected with the first transient noise suppression module according to requirements.

The utility model discloses a set up second rectification filtering unit in first power integral voltage stabilizing module UA, carry out rectification filtering with the signal of input, restrain common mode noise and differential mode noise, then through first current-limiting integral energy storage unit, avoid input voltage too strong or weak, make the load use excessive pressure or under-voltage, then through the voltage of first low pressure voltage stabilizing unit steady output, last through first high frequency noise filtering unit, with the weak current rectification on the signal line, integral and steady voltage are after the steady power that high-speed magnetism isolation chip needs, give the first power end of magnetic coupling transform unit U0.

The utility model provides a second rectification filter unit contains but not limited to integrated diode array U1A etc. and is got from first communication interface's

1, 4, 6 respectively and synthesized first way and is connected with U1A's pin 6, and U1A's pin 3 first communication interface's pin 2 is connected, and U1A's pin 4, pin 1 ground connection, U1A's pin 5 are connected with pin 2, and the link is connected with power network VCC1, the utility model discloses contain but not limited to do not give extra filter circuit after the rectification in figure 3 (R6A and C1A only partially replace filter circuit), need select suitable filter circuit (C type, gamma type or pi type), smooth ripple direct current ripple signal and suppression power noise according to input signal's noise condition.

The first current-limiting integral energy storage unit comprises R5A, R6A and C1A, but the utility model discloses but not limited to the integral energy storage circuit that C1A used other energy storage components (including super capacitor, all kinds of batteries, charge pump IC etc.); the utility model comprises a unit of the load overvoltage and undervoltage protection energy storage circuit which is not shown in figure 3 and is used for judging whether the input energy is too strong or too weak;

the first low voltage regulator unit is formed by R3A, R4A, R5A, U2A etc., the utility model discloses but not limited to UA part uses low-power consumption all kinds of LDO, DCDC, charge pump power supply circuit etc. for example HPxxxx, MExxxx, SSPxxxx, MSTxxxx, HTxxxx, LPxxxx and so on low-power consumption's power supply steady voltage IC.

The first high-frequency noise filtering unit is composed of L2A and C2A, the utility model discloses a but not limited to other high-frequency filtering circuit, like select suitable filtering circuit (C type, gamma type or pi type) according to the noise condition of input signal, restrain required common mode and differential mode noise.

Specifically, as shown in fig. 3, the first current-limiting integral energy storage unit includes a resistor R5A, a resistor R6A, and a capacitor C1A, one end of the resistor R5A is connected to one end of the power supply network VCC1 and the diode D3A, the other end of the diode D3A is grounded, the diode D3A is connected in series to the resistor R5A, the other end of the resistor R5A is connected in series to the resistor R6A, the other end of the resistor R6A is connected in series to the capacitor C1A, and the other end of the capacitor C1A is grounded.

The first low-voltage stabilizing unit comprises a resistor R3A and a resistor R4A, one end of the resistor R3A is connected with the other end of the resistor R5A, the other end of the resistor R3A is connected with the resistor R4A in series, the other end of the resistor R4A is grounded, the connecting end of the resistor R3A and the resistor R4A is connected with a voltage stabilizing source reference electrode, the cathode of the voltage stabilizing source is connected with the other end of the resistor R3A, and the anode of the voltage stabilizing source is grounded.

The first high-frequency noise filtering unit comprises an inductor L2A and a capacitor C2A, the inductor L2A is connected with the cathode of the voltage stabilizing source, the joint of the inductor L2A and the cathode of the voltage stabilizing source is connected with a power supply network VCCA, the other end of the inductor L2A is connected with the capacitor C2A in series, the other end of the capacitor C2A is connected with a pin 4 of the magnetic coupling conversion unit, the connecting end of the inductor L2A and the capacitor C2A is connected with a pin 1 of the magnetic coupling conversion unit, two ends of the capacitor C2A are connected with a diode D4A in parallel, and one end of the diode D4A is grounded with the connecting end of the capacitor C2A.

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

The utility model discloses when first communication interface transmission signal, first transient state noise suppression module DA is used for restraining the lightning stroke surge that comes from outside serial devices, transient noise such as EFT and static, the continuous noise of part protection high pressure, give the power signal and the data signal of filtering transient noise respectively to the first signal end of first power integral voltage stabilizing module UA and magnetic coupling transform unit U0, first power integral voltage stabilizing module UA is responsible for the weak current rectification on the signal line, the integration and steady voltage to the high-speed magnetism after isolating the stable power that the chip needs, give the first power end of magnetic coupling transform unit U0, make and realize complete isolation in data signal transmission process, realize the high-speed signal transmission of first communication interface end, and simultaneously, first power integral voltage stabilizing module UA self has the driving force about 10mA, and the power drive current of magnetic isolation chip is generally several mA just enough, therefore, the power transform module that does not use both sides intercoupling, but the voltage that produces to the accumulation of using respective signal current is just enough on the electric capacity, not only realized two-way high-speed communication (10 ~ 200Mbps, can be used for higher electromagnetic compatibility at the same time, the low-speed requirement, the PCB is more low in price simultaneously, the requirement.

Further, the second transient noise suppression module DB includes a second surge discharging unit, a third rectifying and filtering unit, a second electrostatic protection unit, and a second signal channel noise suppression unit.

The second electrostatic protection unit is used for clamping the abnormal high voltage of the signal acquired by the second communication interface within a safe level in the transmission process of the second transient noise suppression module.

One end of the second signal channel noise suppression unit is connected with the second electrostatic protection unit, and the other end of the second signal channel noise suppression unit is connected with the other end of the magnetic coupling conversion unit, and the second signal channel noise suppression unit is used for receiving the data signals acquired by the second electrostatic protection unit, suppressing common-mode noise in the data signals, and transmitting the common-mode noise to the other end of the magnetic coupling conversion unit.

The utility model discloses a set up second transient noise suppression module DB between second communication interface and magnetic coupling transform unit U0, realize that the signal of first communication interface and the signal power of second communication interface realize thoroughly keeping apart with first transient noise suppression module DA between first communication interface and the magnetic coupling transform unit U0, and when unloading unit restriction signal transmission through the second surge, the overvoltage that the restriction produced in the circuit with unload and discharge the surge current, then with data signal transmission to second electrostatic protection unit, with the power suppression in data transmission at a safety level, at last through second signal channel noise suppression unit, the data signal transmission to the magnetic coupling transform unit U0's of filtering transient noise signal end, carry out power signal processing with power transmission to second power integral voltage stabilization module UB.

And the second surge discharging unit is connected with the second communication interface and is used for limiting overvoltage and discharging surge current generated when the second communication interface acquires signals.

The third rectifying and filtering unit is connected between the first communication interface and the second electrostatic protection unit, and is used for converting alternating signals acquired by the first communication interface during signal transmission into pulsating direct-current voltage and has an auxiliary protection effect on impact.

The second transient noise suppression module DB has the same function as the first transient noise suppression module DA, is disposed at the other end of the magnetic coupling conversion unit U0, and is configured to filter transient noise of the second communication port.

As shown in fig. 2 to fig. 3, specifically, the second transient noise suppression module DB includes a second surge discharging unit connected to the second communication interface, the third rectification and filtering unit is connected between the first communication interface and the second static protection unit, one end of the second static protection unit is connected to the third rectification and filtering unit, the other end of the second static protection unit is connected to the magnetic coupling transformation unit U0 through the second signal channel noise suppression unit, and the second transient noise suppression module DB is used for suppressing transient noises such as lightning surge, EFT, and static from the second communication interface device, so as to partially protect high-voltage continuous noise, and respectively send the power supply and the signal with the transient noise filtered to the second power supply integrating and voltage stabilizing module UB and the magnetic coupling transformation unit U0, so as to implement complete isolation of the signal and improve transmission effect.

Specifically, the second surge discharging unit comprises a capacitor CGB and an electronic resistor RGB, one end of the capacitor CGB is connected with a pin 5 of the second communication interface, the other end of the capacitor CGB is connected with a pin 10 and a pin 11 of the second communication interface, one end of the resistor RGB is connected with the pin 5 of the second communication interface, the other end of the resistor RGB is connected with the pin 10 and the pin 11 of the second communication interface, the capacitor CGB is connected with the resistor RGB in parallel, and one end of the capacitor CGB, which is connected with the pin 11 of the second communication interface, and the resistor RGB is connected with the housing mechanically.

By arranging the second electrostatic protection unit and the second signal channel suppression unit, peak clipping suppression is performed on generated noise current during signal transmission.

And a pin 2 of the third rectification filter unit U3B is connected with a pin 5 of the third rectification filter unit U3B, a pin 3 of the U3B is arranged in a suspended manner, a pin 4 of the U3B is connected with a pin 1 of the U3B, and a pin 6 of the U3B is connected with

pins

7 and 8 of the second communication interface.

Specifically, as shown in fig. 3, the second electrostatic protection unit includes a diode D1B and a diode D2B, one end of the diode D2B is connected to a pin 3 of the second communication interface, the other end of the diode D2B is connected to a pin 5 of the second communication interface, a connection end of the diode D2B and the pin 5 of the second communication interface is grounded, one end of the diode D1B is connected to the other end of the diode D2B, and the other end of the diode D1B is connected to a pin 2 of the first communication interface, so as to implement clamping of an abnormal high voltage in the circuit during transmission.

The second signal channel noise suppression unit comprises resistors R1B and R2B and a magnetic bead L1B, one end of the magnetic bead L1B is grounded, the other end of the magnetic bead L1B is connected with a pin 5 of the magnetic coupling conversion unit U0, the resistor R1B is connected with a pin 2 of the first communication interface, the other end of the resistor R1B is connected with a pin 7 of the magnetic coupling conversion unit U0, the resistor R2B is connected with the first communication interface 3, and the other end of the resistor R2B is connected with a pin 6 of the magnetic coupling conversion unit U0, so that suppression of signal noise is achieved.

Further, the second power integrating and voltage stabilizing module UB includes a second low voltage stabilizing unit and a second high frequency noise filtering unit.

The second low-voltage stabilizing unit is connected with the second communication interface and the second transient noise suppression module, and is used for receiving the power supply signal transmitted by the second transient noise suppression module and stabilizing the output voltage.

One end of the second high-frequency noise filtering unit is connected with the second low-voltage stabilizing unit, and the other end of the second high-frequency noise filtering unit is connected with a second power supply end of the magnetic coupling conversion unit, and the second high-frequency noise filtering unit is used for suppressing common mode noise and differential mode noise in an output power supply signal in the second low-voltage stabilizing unit and transmitting the common mode noise and the differential mode noise to the other end of the magnetic coupling conversion unit.

The second voltage stabilizing unit comprises an adjustable voltage stabilizing source TL431 used for realizing adjustable voltage.

The second low-voltage stabilizing unit and the second high-frequency noise filtering unit have the same technical effects as the first low-voltage stabilizing unit and the first high-frequency noise filtering unit, and are not described herein.

Further, the second power integrating and voltage stabilizing module UB further includes a fourth rectifying and filtering unit and a second current-limiting integrating and energy-storing unit.

And the fourth rectifying and filtering unit is connected with the second electrostatic protection unit, is used for absorbing and converting the alternating signal processed by the second transient noise suppression module into pulsating direct-current voltage, and has an auxiliary protection effect on impact.

The second current-limiting integral energy storage unit is connected between the fourth rectifying and filtering unit and the second low-voltage stabilizing unit and used for storing the power supply signal absorbed by the third rectifying and filtering unit so as to avoid over-strong or over-weak input energy.

As shown in fig. 2, when the second power integrating and voltage stabilizing module UB is configured to transmit the noise-filtered power signal to the second power integrating and voltage stabilizing module UB through the second transient noise suppression module DB, the second power integrating and voltage stabilizing module UB rectifies and integrates the current of the power supply at the second communication interface end, and stabilizes the current to the second power end of the magnetic coupling transformation unit U0, so as to implement complete isolation of the power signals at both ends.

The third rectifying and filtering unit and the electrostatic discharge protection unit are multipath integrated diode arrays U1B and U3B.

Specifically, as shown in fig. 3, a pin 1 of the fourth rectifying and filtering unit U1B is grounded, a pin 6 of the U1B is connected to

pins

1, 4, and 6 of the second communication interface, a pin 2 of the U1B is connected to the power supply network VCC2, a pin 5 of the U1B is connected to the pin 2, a pin 3 of the U1B is connected to a pin 3 of the second communication interface, and a pin 4 of the U1B is connected to the pin 1 of the U1B and grounded.

The second current-limiting integral energy storage unit comprises a resistor R5B, a resistor R6B and a capacitor C1B, one end of the resistor R5B is connected with one ends of a power supply network VCC2 and a diode D3B respectively, the other end of the diode D3B is grounded, the diode D3B is connected with the resistor R5B in parallel, the other end of the resistor R5B is connected with the resistor R6B in series, the other end of the resistor R6B is connected with the capacitor C1B in series, and the other end of the capacitor C1B is grounded.

The second current-limiting integral energy storage unit can be directly connected with the second transient noise suppression module according to different requirements to directly store and transmit power signals, and the third rectifying and filtering unit can be connected with the second current-limiting integral energy storage unit in parallel according to different requirements and arranged in the second power supply integral voltage stabilizing module to prevent the second power supply integral voltage stabilizing module UB from generating electrostatic discharge ESD when objects with different electrostatic potentials are close to or directly contact; the third rectifying and filtering unit and the fourth rectifying and filtering unit are multi-path integrated diode arrays U3B and U1B.

The second low-voltage stabilizing unit comprises a resistor R3B, resistors R4B, a resistor R5B and a U2B, one end of the resistor R3B is connected with the other end of the resistor R5B, the other end of the resistor R3B is connected with the resistor R4B in series, the other end of the resistor R4B is grounded, the connecting end of the resistor R3A and the resistor R4A is connected with the reference electrode of a voltage stabilizing source TL431, the cathode of the voltage stabilizing source is connected with the other end of the resistor R3A, and the anode of the voltage stabilizing source is grounded.

The second high-frequency noise filtering unit comprises an inductor L2B and a capacitor C2B, the inductor L2B is connected with the cathode of a voltage stabilizing source TL431, the connection position of the inductor L2B and the cathode of the voltage stabilizing source is connected with a power supply network VCCB, the other end of the inductor L2B is connected with the capacitor C2B in series, the other end of the capacitor C2B is connected with a pin 5 of a magnetic coupling conversion unit U0, the connection end of the inductor L2B and the capacitor C2B is connected with a pin 8 of the magnetic coupling conversion unit U0, two ends of the capacitor C2B are connected with a diode D4B in parallel, and one end of the diode D4B is grounded with the connection end of the diode C2B.

Preferably, the diode D4B is a secondary electrostatic protection TVS.

The reference numbers of the power supply networks VCC1, VCC2, VCCA, and VCCB described herein are only circuit network names of virtual potentials, and there is no physical power supply.

As shown in fig. 1-3, the utility model discloses a set up second transient noise suppression module DB and second power integration voltage stabilizing module UB, make the high-speed serial signal of second communication interface end, cooperate first transient noise suppression module DA, first power integration voltage stabilizing module DA, through magnetic coupling transform unit U0 be responsible for receiving and dispatching the high-speed serial signal of transform both sides, and filter possible transient noise interference, partly suppress continuous noise interference, guarantee the stability of magnetic coupling transmission high-speed signal, to carrying out thorough isolation from power, signal to the public reference ground between the different interconnection equipment through wired connection, furthest falls the ground loop noise of power and signal to the degree as low as possible (loop area does not nearly exist), consequently greatly reduced the ground loop noise cross coupling influence of power and signal, design reliable noise suppression circuit simultaneously, suppress the noise (including Surge, the t, efesd, power frequency voltage etc.) of above-mentioned signal port to the interference and the influence at other equipment, simple structure, with low costs, small size.

The utility model has the advantages that the signal power supplies at two sides which are interconnected and intercommunicated are thoroughly isolated, and the voltage generated by the accumulation of respective signal current is enough without using the isolated power supply conversion modules at two sides of the coupling; on the other hand, the utility model discloses use high integrated power and diode array, use ordinary adjustable steady voltage source TL431 for the volume is littleer, and the price is lower

The above description is only an embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been described with reference to the exemplary embodiments, but not to limit the present invention, any person skilled in the art can make some changes or modifications to equivalent embodiments using the above-mentioned technical content without departing from the technical scope of the present invention, and the embodiments in the above embodiments can be further combined or replaced, but any simple modification, equivalent change and modification made to the above embodiments by the technical essence of the present invention are also within the scope of the present invention.

Claims

1. A communication interface isolation protection device is characterized in that: comprises the steps of (a) preparing a substrate,

the second transient noise suppression module is connected with the second communication interface and used for receiving the signal acquired by the second communication interface and filtering transient noise in the signal;

2. A communication interface isolation guard as claimed in claim 1, wherein: the first transient noise suppression module may include,

the first electrostatic protection unit is used for clamping the abnormal high voltage of the signal acquired by the first communication interface in the transmission process of the first transient noise suppression module within a safe level;

and one end of the first signal channel noise suppression unit is connected with the first electrostatic protection unit, the other end of the first signal channel noise suppression unit is connected with one end of the magnetic coupling conversion unit, and the first signal channel noise suppression unit is used for receiving the data signal acquired by the first electrostatic protection unit, suppressing common-mode noise in the data signal and transmitting the common-mode noise to one end of the magnetic coupling conversion unit.

3. A communication interface isolation protector according to claim 2, wherein: the first transient noise suppression module further comprises,

and the first rectifying and filtering unit is connected between the first communication interface and the first electrostatic protection unit, and is used for converting an alternating signal obtained by the first communication interface during signal transmission into a pulsating direct-current voltage and has an auxiliary protection effect on impact.

4. A communication interface isolation guard as claimed in claim 3, wherein: the first rectifying and filtering unit is a multi-path integrated diode array U3A.

5. A communication interface isolation guard as claimed in claim 2, wherein: the first power integrating and voltage stabilizing module comprises,

and the first high-frequency noise filtering unit is connected with the first low-voltage stabilizing unit, the other end of the first high-frequency noise filtering unit is connected with one end of the magnetic coupling conversion unit, and the first high-frequency noise filtering unit is used for suppressing common mode noise and differential mode noise in an output power supply signal in the first low-voltage stabilizing unit and transmitting the common mode noise and the differential mode noise to one end of the magnetic coupling conversion unit.

6. The communication interface isolation protector of claim 5, wherein: the first low-voltage stabilizing unit comprises a regulated voltage stabilizing source TL431.

7. The communication interface isolation protector of claim 5, wherein: the first power integrating and voltage stabilizing module further comprises,

and the first current-limiting integral energy storage unit is connected between the second rectifying and filtering unit and the first low-voltage stabilizing unit and is used for storing the power supply signal absorbed by the second rectifying and filtering unit and transmitting the power supply signal to the first low-voltage stabilizing unit.

8. The apparatus of claim 7, wherein: the second rectifying and filtering unit is a multi-path integrated diode array U1A.

9. A communication interface isolation protector as claimed in any one of claims 1 to 8, wherein: the second transient noise suppression module may include,

and one end of the second signal channel noise suppression unit is connected with the second electrostatic protection unit, the other end of the second signal channel noise suppression unit is connected with the other end of the magnetic coupling conversion unit, and the second signal channel noise suppression unit is used for receiving the data signal obtained by the second electrostatic protection unit, suppressing the common-mode noise in the data signal and transmitting the common-mode noise to the other end of the magnetic coupling conversion unit.

10. A communication interface isolation guard as claimed in claim 9, wherein: the second transient noise suppression module further comprises,

11. A communication interface isolation guard as claimed in claim 9, wherein: the second power integrating and voltage stabilizing module comprises,

and one end of the second high-frequency noise filtering unit is connected with the second low-voltage stabilizing unit, and the other end of the second high-frequency noise filtering unit is connected with the other end of the magnetic coupling conversion unit, and is used for suppressing common mode noise and differential mode noise in the output power supply signal in the second low-voltage stabilizing unit and transmitting the common mode noise and the differential mode noise to the other end of the magnetic coupling conversion unit.

12. A communication interface isolation guard as claimed in claim 11, wherein: the second low-voltage stabilizing unit comprises a regulated voltage stabilizing source TL431.

13. A communication interface isolation guard as claimed in claim 11, wherein: the second power integrating and voltage stabilizing module further comprises,

the fourth rectifying and filtering unit is connected with the second electrostatic protection unit and used for absorbing and converting the alternating signals processed by the second transient noise suppression module into pulsating direct-current voltage and has an auxiliary protection effect on impact;

14. A communication interface isolation guard as claimed in claim 1, wherein: the magnetic coupling transformation unit comprises a magnetic coupling transformation unit,