CN216851946U

CN216851946U - Communication signal high-voltage isolation module and device

Info

Publication number: CN216851946U
Application number: CN202220381173.2U
Authority: CN
Inventors: 李高亚; 王世兵; 张豪; 李飞; 孙良俊
Original assignee: Nanjing Eco Microwave System Co ltd
Current assignee: Nanjing Yigao Medical Technology Co ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-06-28
Anticipated expiration: 2032-02-24

Abstract

The utility model relates to the technical field of medical equipment, concretely relates to module and device are kept apart to communication signal high pressure, the module is kept apart to high pressure includes insulating barrier rod, be equipped with a plurality of passageways that run through both ends in the insulating barrier rod, every all be equipped with luminescent device and the light receiving device of a set of relative setting in the passageway, the pin of each luminescent device and light receiving device stretches out, a plurality of from the both ends that correspond the passageway respectively luminescent device/light receiving device in the passageway can set up at homonymy or different side, corresponding withstand voltage demand is satisfied to the length of insulating barrier rod. The utility model provides a pair of module and device are kept apart to communication signal high pressure can satisfy the high pressure isolation requirement 10kV and above, ensures medical electrical equipment communication quality under the high-pressure impact, reduces the error rate, has realized the stable effectual transmission of communication signal under the high-pressure impact, has improved the ann rule performance of product to with low costs, the reliability is high, stability is good, the flexibility is good.

Description

Communication signal high-voltage isolation module and device

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to module and device are kept apart to communication signal high pressure.

Background

With the development of electronic technology, communication is becoming more and more important as an information exchange function, and in the aspect of real-time control and management of microprocessors, in a hierarchical distributed control system composed of a plurality of microprocessors, communication among the microprocessors is generally achieved by transmitting information and data at low voltage through digital signals.

The medical electrical equipment has the requirement on the isolation voltage of the product to be more than 10kV in order to ensure the safety and effectiveness of the medical electrical equipment on the market. The isolation voltage of the common communication isolation design is between 500-1500V, the isolation voltage of the common high-voltage isolation design is generally below 5000V, and in order to realize the isolation voltage of the medical electrical equipment to be above 10kV, the design and raw materials of the device must be considered again, and the stability and reliability of the high-voltage communication isolation device must be redesigned.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the technical problem that the communication isolation device can't satisfy medical electrical equipment high pressure isolation requirement among the prior art, provided a communication signal high pressure isolation module and device, can satisfy the high pressure isolation requirement, ensured medical electrical equipment communication quality under the high-pressure impact, reduced the bit error rate, realized the stable effectual transmission of communication signal under the high-pressure impact, improved the ann's rule performance of product.

The technical scheme of the utility model:

the utility model provides a communication signal high pressure isolation module, includes insulating barrier rod, be equipped with a plurality of passageways that run through both ends in the insulating barrier rod, every all be equipped with a set of relative light emitting device and the light receiving device who sets up in the passageway, each light emitting device and light receiving device's pin stretches out from the both ends that correspond the passageway respectively, and is a plurality of light emitting device/light receiving device in the passageway can set up at homonymy or different side, corresponding withstand voltage demand is satisfied to insulating barrier rod's length.

Furthermore, the insulating isolating rod is also provided with a fixing hole in the length direction for fixing the insulating isolating rod.

Further, the insulating isolation rod is made of black insulating materials.

Further, a light guide pipe is arranged in each channel.

The utility model discloses an on the other hand provides a device, include host computer module and follow the computer module, still include as above arbitrary one the high pressure keep apart the module, host computer module and follow the computer module pass through the high pressure is kept apart the module and is kept apart, the pin welding that each passageway first end of module stretches out is kept apart with high pressure to the host computer module, keep apart the pin welding that each passageway second end of module stretches out from computer module and high pressure.

Furthermore, the slave module further comprises an isolation circuit board, a first end of the isolation circuit board is welded with pins extending out of second ends of channels of the high-voltage isolation module, and a connector is arranged at the second end of the isolation circuit board.

Furthermore, the device also comprises a mainboard, the host module is configured on the mainboard, the mainboard is welded with pins extending out of the first ends of the channels of the high-voltage isolation module, the insulating isolation rod is perpendicular to the isolation circuit board, and the insulating isolation rod is perpendicular to the mainboard.

Furthermore, the minimum distance between the connector and the welding part on the isolation circuit board meets the corresponding pressure-resistant requirement.

Furthermore, an encryption communication protocol is adopted among the host module, the high-voltage isolation module and the slave module.

The device further comprises a serial communication isolation circuit, the serial communication isolation circuit comprises a first light-emitting device and a second light-emitting device which are arranged at the first end of the insulating isolation rod and electrically connected with the host module, the serial communication isolation circuit further comprises a first light-emitting device and a second light-emitting device which are arranged at the second end of the insulating isolation rod and electrically connected with the slave module, the host module is further provided with a shaping chip U1 for shaping a host end received signal, the slave module is further provided with a shaping chip U2 for shaping a slave end received signal, the host module and the slave module adopt two power supply circuits, and the two power supply circuits are isolated by a transformer.

After the technical scheme is adopted, compared with the prior art, the utility model, have following beneficial effect: the utility model discloses a length setting to insulating barrier rod can realize that the high-pressure data communication more than 10kV keeps apart, has avoided the medical instrument product to the damage of singlechip communication circuit when carrying out ann's rule withstand voltage test to, the high pressure that this embodiment adopted keeps apart the module and compares with costly special isolation chip, and its simple structure, with low costs, and withstand voltage level can dispose in a flexible way, can reach very high. Furthermore, the utility model provides an be equipped with a plurality of passageways in the insulating barrier rod, can set up the quantity of passageway promptly illuminator and light receiving device's group number according to the communication interface of difference to and set for the transmission direction of signal in each passageway through the position that sets up illuminator and light receiving device in every passageway, so can satisfy the communication demand under the various condition.

Drawings

FIG. 1 is a perspective view of an insulating spacer rod of the present embodiment;

FIG. 2 is a schematic cross-sectional view of one of the channels of the high voltage isolation module of the present embodiment;

FIG. 3 is a schematic structural diagram of the isolation circuit board of the present embodiment;

FIG. 4 is a schematic structural diagram of the isolation circuit board and the isolation rod of the present embodiment;

FIG. 5 is an exploded view of the isolated circuit board, the insulating isolation bar and the motherboard of the present embodiment;

FIG. 6 is a system block diagram of the apparatus of the present embodiment;

FIG. 7 is a schematic signal transmission diagram of the apparatus of the present embodiment;

FIG. 8 is a schematic circuit diagram of the two-way isolation circuit of the present embodiment;

FIG. 9 is a schematic circuit diagram of the two-way power supply circuit of the present embodiment;

fig. 10 is a schematic structural diagram of an insulating spacer bar in another embodiment of this embodiment.

Wherein the content of the first and second substances,

the high-voltage isolation module 1, the insulating isolation rod 11, the channel 111, the fixing hole 112, the light emitting device 12 and the light receiving device 13;

a host module 2, a motherboard 21;

slave module 3, isolation circuit board 31, connector 311.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 1-9, the present embodiment provides a communication signal high voltage isolation module 1, the high voltage isolation module 1 includes an insulating isolation rod 11, the insulating isolation rod 11 is rod-shaped, a plurality of channels 111 penetrating through both ends are disposed in the insulating isolation rod 11 in the length direction, each channel 111 is provided with a set of light emitting device 12 and light receiving device 13 disposed oppositely, pins of each light emitting device 12 and light receiving device 13 respectively extend from both ends of the corresponding channel 111, specifically, as shown in fig. 2, the light emitting device 12 and light receiving device 13 are respectively fixed at both ends of a channel 111, a closed space is formed in the channel 111, the light emitting device 12 can be a light emitting diode, pins thereof are used as input ends, the light receiving device 13 can be a light receiving diode, pins thereof are used as output ends, when a power signal is applied to the input ends, the light emitting device 12 emits light, the light receiving device 13 generates light current due to the photosensitive effect after illumination, and output by the output terminal; when the input terminal does not have an electric signal, the light emitting device 12 does not emit light, and the light receiving device 13 does not output a current, that is, the light receiving device 13 outputs different signals when the light emitting device 12 emits light or does not emit light, respectively. Thus, optical-mediated electrical signal transmission is realized, and the input end and the output end are electrically insulated, so that the input end and the output end are well isolated.

Further, the light emitting devices 12 in the plurality of channels 111 may be disposed on the same side or different sides, that is, the light emitting devices 12 in each channel 111 may be disposed at the first end or the second end of the insulating spacer rod 11; or a part of the light emitting devices 12 may be disposed at the first end of the insulating spacer rod 11, and another part may be disposed at the second end of the insulating spacer rod 11. Similarly, the light receiving devices 13 in the plurality of channels 111 may also be disposed on the same side or different sides, that is, the light receiving devices 13 in each channel 111 may be disposed at the first end or the second end of the insulating spacer rod 11; or a part of the light receiving device 13 may be disposed at the first end of the insulating spacer rod 11 and another part may be disposed at the second end of the insulating spacer rod 11. Of course, the light receiving devices 13 need to be arranged corresponding to the light emitting devices 12, and the positions of the light emitting devices 12 and the light receiving devices 13 are determined.

Further, the length of the insulating spacer 11 needs to meet the corresponding voltage withstand requirement, assuming that air is located between the light emitting device 12 and the light receiving device 13 in each channel 111, the breakdown voltage in the air according to the extremely non-uniform electric field is about 4.5kV/cm, and the length of the insulating spacer 11 is set to a specific length according to the voltage withstand requirement, and if the voltage over 10kV is met, the length over 2.3cm needs to be designed to meet the corresponding voltage withstand requirement. When the light emitting device 12 and the light receiving device 13 in each channel 111 are made of other materials, the length of the insulating spacer 11 can be calculated appropriately.

Therefore, firstly, the present embodiment can implement high voltage data communication isolation of more than 10kV by setting the length of the insulating isolation rod 11, and solves the problem that the single chip microcomputer has no isolation setting or the high voltage withstand requirement of the medical device cannot be met by using a special isolation chip, and avoids the damage to the single chip microcomputer communication circuit when the safety voltage withstand test is performed on the medical device product, and the high voltage isolation module 1 adopted in the present embodiment has a simple structure, is low in cost, and can flexibly configure the voltage withstand level, and can reach a very high voltage, compared with the high-cost special isolation chip. Next, in the present embodiment, a plurality of channels 111 are disposed in the insulating spacer 11, the number of the channels 111, that is, the number of the groups of the light emitting devices 12 and the light receiving devices 13, can be set according to different communication interfaces, and the transmission direction of the signal in each channel 111 is set by setting the positions of the light emitting devices 12 and the light receiving devices 13 in each channel 111, so that the communication requirements under various conditions can be met.

Preferably, as shown in fig. 1, the insulating spacer rod 11 in this embodiment is further provided with a fixing hole 112 in the length direction for cooperating with a screw to fix the insulating spacer rod 11. Specifically, the fixing hole 112 is provided at the center of the insulating spacer 11, and the passages 111 are uniformly spaced in the outer circumferential direction of the fixing hole 112. This high voltage isolation module 1 need be welded with other modules with the pin that its both ends stretch out when using, only can't effectively fix this high voltage isolation module 1 through the welding, especially at insulating barrier rod 11 length long term, and still there is the risk that leads to the welding department to drop, consequently this embodiment is fixed with other modules with high voltage isolation module 1 through set up fixed orifices 112 in insulating barrier rod 11, thereby fix high voltage isolation module 1 better, and can guarantee the long-term effectual electricity of welding department and connect, promote the security. In addition, the fixing holes 112 in this embodiment are arranged along the length direction of the insulating isolation rod 11, that is, the insulating isolation rod 11 can be vertically installed and vertically installed with the circuit boards of other modules, so when the voltage-withstanding grade needs to be changed, the length of the insulating isolation rod 11 can be directly changed without changing the circuit boards, and the devices in the prior art are all transversely installed, and corresponding adjustment must be made to the pin solder joint spacing and the like on the circuit boards when the devices are changed according to the voltage-withstanding grade, so the high-voltage isolation module 1 in this embodiment has better flexibility and adaptability compared with the prior art.

Preferably, the insulating spacers 11 of the present embodiment are made of black insulating material, so that light emitted from the light emitting devices 12 can be transmitted along the channels 111 without light leakage, and light emitted from the light emitting devices 12 of different channels 111 can not interfere with each other. Preferably, a light pipe (not shown) is further disposed in each channel 111, so that light from the light emitting device 12 is transmitted to the corresponding light receiving device 13 along the light pipe, and the light transmission efficiency is improved.

The present embodiment further provides an apparatus for medical equipment, as shown in fig. 6 to 7, the apparatus includes a master module 2 and a slave module 3, the master module 2 and the slave module 3 can transmit data to each other, the master module 2 mainly transmits data, the slave module 3 mainly feeds back data, the apparatus further includes the above-mentioned high voltage isolation module 1, and the master module 2 and the slave module 3 are isolated by the high voltage isolation module 1. The host module 2 is welded with pins extending out of the first ends of the channels 111 in the high-voltage isolation module 1, and the slave module 3 is welded with pins extending out of the second ends of the channels 111 in the high-voltage isolation module 1. Because the digital signal circuit can not bear the voltage of more than 10kV level, the interference can be introduced into the digital communication interface by the loop circuit and flows through the whole circuit, so that the circuit devices are damaged, and the embodiment isolates through the high-voltage isolation module 1, thereby ensuring the communication stable transmission and simultaneously improving the safety of the circuit.

Further, as shown in fig. 3-5, the slave module 3 of this embodiment further includes an isolation circuit board 31, a first end of the isolation circuit board 31 is soldered to a pin extending from a second end of each channel 111 of the high voltage isolation module 1, and a second end of the isolation circuit board 31 is provided with a connector 311, which is convenient for being connected to a main control circuit of the subsequent slave module 3 through the connector 311. Furthermore, the device also comprises a mainboard 21, the mainboard 21 is provided with a host module 2, and the mainboard 21 is welded with pins extending from the first ends of the channels 111 of the high-voltage isolation module 1, so that the connection of the host module 2, the high-voltage isolation module 1 and the slave module 3 is realized. Preferably, the insulating isolation rod 11 is perpendicular to the isolation circuit board 31, and the insulating isolation rod 11 is perpendicular to the main board 21, so that the high voltage isolation module 1 is vertically installed as described above, and the flexibility and the adaptability are good.

In order to save space and cost, the master control circuit of the slave module 3 may be disposed on the motherboard 21, i.e. the connector 311 on the isolation circuit board 31 is also soldered to the corresponding portion on the motherboard 21, as shown in fig. 5, in this case, the voltage-resistant impact may select a path from the first end of the insulating isolation rod 11, i.e. its lower end pin, to the lower end of the connector 311 on the isolation circuit board 31 (when the path is smaller than the length of the insulating isolation rod 11), and if the path is not long enough, there is still a risk of breakdown and the voltage-resistant requirement of 10kV cannot be satisfied, and the length of the path is equal to the distance between the connector 311 on the isolation circuit board 31 and the soldering portion (i.e. the portion of the isolation circuit board 31 soldered to the second end of each channel 111), so that the minimum horizontal distance between the connector 311 on the isolation circuit board 31 and the soldering portion is set to satisfy the corresponding voltage-resistant requirement, for example, the distance is set to 2.3cm or more at 10 kV. Therefore, when any path is selected by the withstand voltage impact, breakdown can not occur, and the withstand voltage requirement can be met.

Preferably, in this embodiment, a customized communication protocol is used among the master module 2, the high-voltage isolation module 1, and the slave module 3, and communication encryption can be performed, and a standard communication protocol can be used for transmission or reception at the front end of the master module 2 and the rear end of the slave module 3, so that reliability and safety can be improved, and since encryption is performed only on the part of the high-voltage isolation module 1, latency is relatively reduced, and speed is faster.

The device further comprises a serial communication isolation circuit, the serial communication isolation circuit comprises a first light-emitting device and a second light-emitting device which are arranged at the first end of the insulating isolation rod 11 and electrically connected with the host module 2, the serial communication isolation circuit further comprises a first light-emitting device and a second light-emitting device which are arranged at the second end of the insulating isolation rod 11 and electrically connected with the slave module 3, the host module 2 is further provided with a shaping chip U1 for shaping a host end received signal, the slave module 3 is further provided with a shaping chip U2 for shaping a slave end received signal, the waveforms of the sent signal and the received signal are ensured to be consistent through shaping, and accurate identification of the host signal and the slave signal is ensured. That is to say, the device adopting the high-voltage isolation module 1 of the embodiment can not only perform simple one-way signal transmission, but also perform serial communication.

Taking the insulating isolation rods 11 of the five channels 111 as an example, as shown in fig. 8, the device includes a master-side isolation circuit and a slave-side isolation circuit, where communication channels of the master-side isolation circuit and the slave-side isolation circuit correspond to each other one by one. Specifically, the master-end isolation circuit includes five devices, namely an LED1, an LED3, an LED5, an LED7 and an LED9, which are respectively disposed at first ends of the five channels 111 of the insulating isolation rod 11, and the slave-end isolation circuit also includes five devices, namely an LED2, an LED4, an LED6, an LED8 and an LED10, which are respectively disposed at second ends of the five channels 111 of the insulating isolation rod 11. The LED1 corresponds to the LED2, the LED3 corresponds to the LED4, and the LED5 corresponds to the LED6, so as to form three groups of I/O level signals, where the LED1, the LED3, and the LED6 transmit signals, and the LED2, the LED4, and the LED5 receive signals, but in other embodiments, each device may be configured to transmit or receive signals as needed. The LED7 corresponds to the LED8, the LED9 corresponds to the LED10, the LED9 is the first light emitting device, the LED10 is the first light receiving device, the LED8 is the second light emitting device, and the LED7 is the second light receiving device, so as to form a group of TTL serial port isolation communication signals, the master end isolation circuit further includes a shaping chip U1, the slave end isolation circuit further includes a shaping chip U2, when the master module 2 sends a signal through the LED9, the LED10 receives the signal, then the signal is shaped by the shaping chip U2 and fed back to the master control chip MCU1 of the slave module 3, the slave module 3 sends the signal through the LED8, and the LED7 receives the signal, then the signal is shaped by the shaping chip U1 and fed back to the master control chip MCU2 of the master module 2.

In the host-side isolation circuit, except the five devices of the LED1, the LED3, the LED5, the LED7 and the LED9, the rest devices are all arranged on the motherboard 21, and each signal receiving/transmitting end is connected with the main control chip MCU1 of the host module 2; the devices in the slave-end isolation circuit are all arranged on the isolation circuit board 31, and each signal sending end/receiving end is connected with the master control chip MCU2 of the slave module 3 through a connector 311. The main machine end isolation circuit further comprises current-limiting resistors R2, R3, R5, R8 and R10, and the auxiliary machine end isolation circuit further comprises current-limiting resistors R1, R7, R4, R6 and R13, wherein the current-limiting resistors are selectively configured according to the power supply voltage and the optimal working state of the light-emitting device 12/the light-receiving device 13.

In this embodiment, specifically, as shown in fig. 9, in this embodiment, the master module 2 and the slave module 3 use two power supply circuits, the two power supply circuits are isolated by a transformer T1, the left side of the transformer T1 supplies power to the master module 2, and the right side of the transformer T1 supplies power to the slave module 3, so as to implement power supply isolation between the master module 2 and the slave module 3. Specifically, the left side of the transformer T1 adopts a chip AT8870 to provide a required power supply, two output ends on the right side are respectively connected with two diodes, so that wiring is convenient and errors are avoided, and in the embodiment, the transformer T1 also adopts a high-voltage isolation transformer corresponding to a withstand voltage level so as to meet a withstand voltage requirement. In this way, the master module 2 and the slave module 3 are completely electrically isolated, ensuring that accidental electrical damage does not pose a risk to the operator and the user.

As another embodiment of this embodiment, the number of the channels 111 in the insulating spacer 11 can be set arbitrarily according to the actual communication requirement, as shown in fig. 10, 12 channels 111 are provided in the insulating spacer 11, the middle portion of the insulating spacer 11 is a fixing hole 112, and two circles of the channels 111 are formed on the periphery of the fixing hole 112 to accommodate the light emitting device 12 and the light receiving device 13, respectively.

Therefore, the communication signal high-voltage isolation module and the communication signal high-voltage isolation device provided by the embodiment can meet the high-voltage isolation requirement, ensure the communication quality of medical electrical equipment such as high-voltage equipment with a high-frequency electrotome and the like under high-voltage impact, reduce the error rate, realize stable and effective transmission of communication signals under the high-voltage impact, improve the safety performance of products, and have the advantages of low cost, high reliability, good stability and good flexibility.

The above, only be the embodiment of the preferred of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, which are designed to be replaced or changed equally, all should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a communication signal high pressure isolation module, its characterized in that, includes insulating barrier rod (11), be equipped with a plurality of passageways (111) that run through both ends in insulating barrier rod (11), every all be equipped with luminescent device (12) and the light receiving device (13) of a set of relative setting in passageway (111), the pin of each luminescent device (12) and light receiving device (13) stretches out from the both ends that correspond passageway (111) respectively, and is a plurality of luminescent device (12)/light receiving device (13) in passageway (111) can set up in homonymy or different sides, the length of insulating barrier rod (11) satisfies corresponding withstand voltage demand.

2. The communication signal high voltage isolation module according to claim 1, wherein the insulating isolation rod (11) is further provided with a fixing hole (112) in the length direction for fixing the insulating isolation rod (11).

3. The communication signal high voltage isolation module according to claim 1, wherein the insulating isolation rod (11) is a black insulating material.

4. The communication signal high voltage isolation module according to claim 1, wherein each channel (111) further comprises a light pipe.

5. An apparatus comprising a master module (2) and a slave module (3), characterized in that it further comprises a high voltage isolation module according to any one of claims 1 to 4, said master module (2) and said slave module (3) being isolated by said high voltage isolation module, said master module (2) being welded to pins extending from first ends of respective channels (111) of said high voltage isolation module, said slave module (3) being welded to pins extending from second ends of respective channels (111) of said high voltage isolation module.

6. The device according to claim 5, characterized in that the slave module (3) further comprises an isolation circuit board (31), a first end of the isolation circuit board (31) is soldered to a pin protruding from a second end of each channel (111) of the high voltage isolation module, and a second end of the isolation circuit board (31) is provided with a connector (311).

7. The device according to claim 6, further comprising a main board (21), wherein the main board (21) is configured with the host module (2), the main board (21) is soldered to the pins extending from the first end of each channel (111) of the high voltage isolation module, the insulating isolation rod (11) is disposed perpendicular to the isolation circuit board (31), and the insulating isolation rod (11) is disposed perpendicular to the main board (21).

8. The device according to claim 7, characterized in that the minimum distance between the connector (311) and the soldering part on the isolating circuit board (31) meets the corresponding pressure resistance requirement.

9. The device according to claim 5, characterized in that an encrypted communication protocol is used between the master module (2), the high voltage isolation module and the slave module (3).

10. The device according to claim 5, further comprising a serial communication isolation circuit, wherein the serial communication isolation circuit comprises a first light emitting device and a second light emitting device which are arranged at a first end of the insulating isolation rod (11) and electrically connected with the host module (2), the serial communication isolation circuit further comprises a first light emitting device and a second light emitting device which are arranged at a second end of the insulating isolation rod (11) and electrically connected with the slave module (3), the host module (2) is further provided with a shaping chip U1 for shaping a host end received signal, the slave module (3) is further provided with a shaping chip U2 for shaping a slave end received signal, the host module (2) and the slave module (3) adopt a two-way power supply circuit, and the two-way power supply circuit is isolated by a transformer.