CN117544248B - Isolated serial interface communication device and method - Google Patents
Isolated serial interface communication device and method Download PDFInfo
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- CN117544248B CN117544248B CN202410032505.XA CN202410032505A CN117544248B CN 117544248 B CN117544248 B CN 117544248B CN 202410032505 A CN202410032505 A CN 202410032505A CN 117544248 B CN117544248 B CN 117544248B
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- 238000004891 communication Methods 0.000 title claims abstract description 165
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims abstract description 52
- 238000005859 coupling reaction Methods 0.000 claims abstract description 51
- 230000008878 coupling Effects 0.000 claims abstract description 50
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 230000000630 rising effect Effects 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/005—Reducing noise, e.g. humm, from the supply
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Abstract
The invention relates to the technical field of interface communication, and particularly discloses an isolated serial interface communication device and method, wherein the device comprises the following components: at least two digital serial communication modules, each digital serial communication module is electrically connected with the code transmitting module and the code receiving module; the coupling isolator is arranged between any two adjacent digital serial communication modules; the code transmitting module is used for encoding the digital serial communication protocol signals into differential zero crossing or zero returning pulse signals and transmitting the differential zero crossing or zero returning pulse signals through the coupling isolator; the code receiving module is used for receiving the differential zero crossing or zero returning pulse signals of the coupling isolator and converting the differential zero crossing or zero returning pulse signals into corresponding digital serial communication protocol signals. The invention encodes the digital serial communication protocol signal into the differential zero crossing or zero returning pulse signal, and receives and transmits the differential zero crossing or zero returning pulse signal through the coupling isolator, thereby reducing the encoding quantity in the data transmission process, improving the communication stability, ensuring higher data transmission rate and reducing the probability of error codes.
Description
Technical Field
The invention relates to the technical field of interface communication, in particular to an isolated serial interface communication device and method.
Background
In a battery measurement system, serial communication is a common communication mode, and when the number of communication units exceeds two, a daisy chain serial communication mode is generally adopted, so that a large amount of wiring resources can be saved; however, because the voltages of the units may be different, the communication in different areas needs to be electrically isolated, and the communication is performed in a pulse coupling mode; in the pulse coupling process, pulse interference is usually generated, and reducing the coupling pulse interference is a key for improving the serial isolation type communication quality.
The prior art generally reduces impulse interference by three means: 1) Chip selection and data distinction of serial communication are realized in a wide pulse and narrow pulse mode; 2) Chip selection and data distinction of serial communication are realized through the number of differential sine; 3) And transmitting the data by performing primary coding on the two-bit data. However, the wide pulse and the narrow pulse mode are differential pulses, so that overshoot can exist to influence the communication quality; the method adopts a plurality of differential sine modes, and a plurality of differential sine signals are used for representing one-bit data, so that the power consumption is increased; and the multi-bit coding is more complex to realize in a pulse mode circuit.
The existing coding mode is single, and error code phenomenon can occur; in addition, positive and negative isolated pulses are easy to cause overshoot or ringing, and the stability of communication is affected.
Based on the technical background, the invention researches an isolated serial interface communication device and method.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an isolated serial interface communication device and a method, wherein the device codes a digital serial communication protocol signal into a differential zero crossing or zero returning pulse signal and transmits and receives the differential zero crossing or zero returning pulse signal through a coupling isolator, so that the coding quantity in the data transmission process is effectively reduced, the communication stability is improved, the higher data transmission rate can be ensured, the communication robustness is enhanced, and the probability of error codes is reduced.
To achieve the above object, a first aspect of the present invention provides an isolated serial interface communication device, including:
the communication port of each digital serial communication module is provided with a code sending module and a code receiving module;
the coupling isolator is arranged between any two adjacent digital serial communication modules;
the code transmitting module is used for encoding the digital serial communication protocol signals of the digital serial communication module where the code transmitting module is positioned into differential zero crossing or zero returning pulse signals and transmitting the differential zero crossing or zero returning pulse signals through the coupling isolator;
the code receiving module is used for receiving the differential zero crossing or zero returning pulse signals of the coupling isolator, converting the differential zero crossing or zero returning pulse signals into corresponding digital serial communication protocol signals and sending the digital serial communication protocol signals to the digital serial communication module where the digital serial communication protocol signals are located.
A second aspect of the present invention provides an isolated serial interface communication method performed in the above apparatus, comprising:
each code transmitting module codes the digital serial communication protocol signal of the digital serial communication module where the code transmitting module is positioned into a differential pulse signal and transmits the differential pulse signal to the next adjacent digital serial communication module through a coupling isolator;
each code receiving module receives the differential pulse signal sent to the coupling isolator by the last adjacent digital serial communication module, converts the differential pulse signal into a corresponding digital serial communication protocol signal and then sends the digital serial communication protocol signal to the digital serial communication module where the digital serial communication module is located.
The beneficial effects of the invention include:
(1) According to the isolated serial interface communication device, the digital serial communication protocol signals are encoded into the differential zero-crossing or zero-return pulse signals, and the differential zero-crossing or zero-return pulse signals are transmitted and received through the coupling isolator, so that the encoding quantity in the data transmission process is effectively reduced, the communication stability is improved, the higher data transmission rate can be ensured, the communication robustness is enhanced, and the probability of error codes is reduced.
(2) The isolated serial interface communication device provided by the invention prevents the overshoot and ringing of the isolated data signal by encoding the data signal into the pulse with the return-to-zero form, thereby improving the reliability of data transmission.
(3) The isolated serial interface communication device provided by the invention reduces the probability of error code occurrence by encoding the chip selection signal into two zero-crossing positive or zero-crossing negative pulses, and meanwhile, the frequency of chip selection occurrence is low, so that the power consumption is not obviously influenced.
(4) The isolated serial interface communication device provided by the invention utilizes the coding rule of differential zero crossing or zero returning, and combines the coupling isolator to effectively reduce overshoot interference in the communication process, thereby realizing lower design complexity, ensuring transmission rate and improving communication stability.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 is a schematic structural diagram of an isolated serial interface communication device according to the present invention.
Fig. 2 is a schematic diagram of a corresponding timing sequence of a communication protocol signal received by a code transmitting module and a differential zero crossing or return-to-zero pulse signal encoded by the code transmitting module in the isolated serial interface communication device according to the present invention.
Fig. 3 is a schematic diagram of coding rules in the isolated serial interface communication device according to the present invention.
Fig. 4 is a schematic structural diagram of an isolated serial interface communication device according to an embodiment of the present invention.
Reference numerals illustrate:
the device comprises a 1-digital serial communication module, a 2-code receiving module, a 3-code transmitting module and a 4-coupling isolator;
CSN-chip select signal, SCLK-clock signal, SDI-input signal, ISO-differential zero crossing or return-to-zero pulse signal;
CS 00-chip select valid signal, CS 11-chip select invalid signal, +1plus-communication data is logic high level at the time of clock rising edge, -1plus-communication data is logic low level at the time of clock rising edge.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein.
In the present invention, unless otherwise indicated, terms of orientation such as "upper and lower" are used to generally refer to the upper and lower portions of the device in normal use, and "inner and outer" are used with respect to the profile of the device. Furthermore, the terms "first, second, third and the like" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first, second, third" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The invention provides an isolated serial interface communication device, as shown in figure 1, comprising:
at least two digital serial communication modules 1, wherein the communication port of each digital serial communication module 1 is electrically connected with the code transmitting module 3 and the code receiving module 2;
the coupling isolator 4 is arranged between any two adjacent digital serial communication modules 1;
the code transmitting module 3 is used for encoding the digital serial communication protocol signals of the digital serial communication module 1 which are electrically connected with the code transmitting module into differential zero crossing or zero return pulse signals and transmitting the differential zero crossing or zero return pulse signals through the coupling isolator 4;
the code receiving module 2 is configured to receive the differential zero crossing or zero returning pulse signal of the coupling isolator 4, convert the differential zero crossing or zero returning pulse signal into a corresponding digital serial communication protocol signal, and send the digital serial communication protocol signal to the digital serial communication module 1 electrically connected with the corresponding digital serial communication protocol signal.
In the invention, the digital serial communication protocol signal is encoded into the differential zero crossing or zero returning pulse signal, and is transmitted and received through the coupling isolator 4, so that the encoding quantity in the data transmission process is effectively reduced, the communication stability is improved, the higher data transmission rate can be ensured, the communication robustness is enhanced, and the probability of error codes is reduced.
According to the invention, at least two digital serial communication modules 1 comprise a master and at least one slave;
when the number of at least one slave is more than one, at least two digital serial communication modules 1 are electrically connected to each other end to end in a daisy-chain manner.
According to the invention, each slave is provided with a differential zero crossing or zero return pulse signal inlet and a differential zero crossing or zero return pulse signal outlet;
a coupling isolator 4 is provided on a pair of transmission lines electrically connecting the differential zero-crossing or zero-return pulse signal inlet and the differential zero-crossing or zero-return pulse signal outlet.
According to the invention, the coupling isolator 4 is a transformer isolator or a capacitive isolator.
Preferably, the digital serial communication protocol is a full duplex, synchronous communication, and the communication interface includes chip select, clock, input and output interfaces.
Preferably, the digital serial communication protocol is the SPI protocol.
According to the invention, the coding rules followed by the code transmitting module 3 and the code receiving module 2 are:
the chip select valid signal is represented as two consecutive zero-crossing negative going pulses;
a logic low level of communication data at the rising edge of the clock is represented as a negative-return-zero-positive pulse;
the communication data being a logic high level at the rising edge of the clock is represented as a positive-return-to-zero-negative pulse;
the chip select disable signal is represented as two consecutive zero crossing positive going pulses.
In the invention, the data signal is encoded into the pulse with the form of zero return, thereby preventing the overshoot and ringing of the isolated data signal and improving the reliability of data transmission.
In the invention, the chip selection signal is encoded into two zero-crossing positive or zero-crossing negative pulses, so that the probability of error code occurrence is reduced, and meanwhile, the frequency of chip selection occurrence is low, so that the power consumption is not obviously influenced.
In the invention, the overshoot interference in the communication process can be effectively reduced by utilizing the differential zero crossing or zero returning coding rule and combining the coupling isolator 4, so that lower design complexity is realized, the transmission rate is ensured, and the communication stability is improved.
The invention also provides an isolated serial interface communication method performed in the device, which comprises the following steps:
each code transmitting module 3 encodes the digital serial communication protocol signal of the digital serial communication module 1 where the code transmitting module is located into a differential zero crossing or zero return pulse signal, and transmits the differential zero crossing or zero return pulse signal to the next adjacent digital serial communication module 1 through the coupling isolator 4;
each code receiving module 2 receives the differential zero crossing or zero returning pulse signal sent by the last adjacent digital serial communication module 1 to the coupling isolator 4, converts the differential zero crossing or zero returning pulse signal into a corresponding digital serial communication protocol signal, and then sends the corresponding digital serial communication protocol signal to the digital serial communication module 1 where the digital serial communication module is located.
According to the present invention, there is also provided: the code transmitting module 3 of the host encodes the digital serial communication protocol signal of the host into a differential zero crossing or zero returning pulse signal and transmits the differential zero crossing or zero returning pulse signal to the adjacent slave through the coupling isolator 4;
except for the slaves adjacent to the master, the code receiving module 2 of each slave receives the differential zero crossing or zero returning pulse signal sent from the last adjacent slave to the coupling isolator 4, converts the differential zero crossing or zero returning pulse signal into a corresponding digital serial communication protocol signal and then sends the corresponding digital serial communication protocol signal to the slave where the differential zero crossing or zero returning pulse signal is located.
According to the present invention, there is also provided:
the code transmitting module 3 of each slave except the last slave codes the digital serial communication protocol signal of the slave into a differential zero crossing or zero return pulse signal and transmits the differential zero crossing or zero return pulse signal to the next adjacent slave through the coupling isolator 4;
the last slave's code transmitting module 3 codes the slave's digital serial communication protocol signal into a differential zero-crossing or zero-return pulse signal and transmits it to the master through the coupling isolator 4.
The invention will be described in more detail by means of a specific example.
Example 1
As shown in fig. 4, the present embodiment provides an isolated serial interface communication device, including:
the four digital serial communication modules 1, the communication port of each digital serial communication module 1 is electrically connected with the code sending module 3 and the code receiving module 2;
the coupling isolator 4 is arranged between any two adjacent digital serial communication modules 1;
the code transmitting module 3 is used for encoding the digital serial communication protocol signals of the digital serial communication module 1 which are electrically connected with the code transmitting module into differential zero crossing or zero return pulse signals and transmitting the differential zero crossing or zero return pulse signals through the coupling isolator 4;
the code receiving module 2 is used for receiving the differential zero crossing or zero returning pulse signal of the coupling isolator 4, converting the differential zero crossing or zero returning pulse signal into a corresponding digital serial communication protocol signal, and transmitting the digital serial communication protocol signal to the digital serial communication module 1 which is electrically connected with the code receiving module;
the four digital serial communication modules 1 comprise a master computer and three slave computers which are electrically connected end to end in a daisy chain manner;
each slave is provided with a differential zero crossing or zero returning pulse signal inlet and a differential zero crossing or zero returning pulse signal outlet;
a coupling isolator 4 is arranged on a pair of transmission lines electrically connecting the differential zero crossing or zero return pulse signal inlet and the differential zero crossing or zero return pulse signal outlet;
in this embodiment, the coupling isolator 4 is a transformer isolator; the digital serial communication protocol is SPI protocol;
as shown in fig. 3, the coding rules that the code transmitting module 3 and the code receiving module 2 follow are:
the chip select valid signal is represented as two consecutive zero-crossing negative going pulses;
a logic low level of communication data at the rising edge of the clock is represented as a negative-return-zero-positive pulse;
the communication data being a logic high level at the rising edge of the clock is represented as a positive-return-to-zero-negative pulse;
the chip select disable signal is represented as two consecutive zero crossing positive going pulses;
the corresponding time sequence relation between the communication protocol signal received by the code sending module and the differential zero crossing or zero returning pulse signal coded by the code sending module is shown in figure 2;
in this embodiment, the code decodes the differential zero crossing or return zero pulse signal into a communication protocol signal according to the same coding rules and timing relationships of the module.
The embodiment provides an isolated serial interface communication method, which comprises the following steps:
each code transmitting module 3 encodes the digital serial communication protocol signal of the digital serial communication module 1 where the code transmitting module is located into a differential zero crossing or zero return pulse signal, and transmits the differential zero crossing or zero return pulse signal to the next adjacent digital serial communication module 1 through the coupling isolator 4;
each code receiving module 2 receives the differential zero crossing or zero returning pulse signal sent by the last adjacent digital serial communication module 1 to the coupling isolator 4, converts the differential zero crossing or zero returning pulse signal into a corresponding digital serial communication protocol signal and then sends the corresponding digital serial communication protocol signal to the digital serial communication module 1;
the code transmitting module 3 of the host encodes the digital serial communication protocol signal of the host into a differential zero crossing or zero returning pulse signal and transmits the differential zero crossing or zero returning pulse signal to the adjacent slave through the coupling isolator 4;
except for the slaves adjacent to the master, the code receiving module 2 of each slave receives the differential zero crossing or zero returning pulse signal sent from the last adjacent slave to the coupling isolator 4, converts the differential zero crossing or zero returning pulse signal into a corresponding digital serial communication protocol signal and then sends the corresponding digital serial communication protocol signal to the slave where the differential zero crossing or zero returning pulse signal is located;
the code transmitting module 3 of each slave except the last slave codes the digital serial communication protocol signal of the slave into a differential zero crossing or zero return pulse signal and transmits the differential zero crossing or zero return pulse signal to the next adjacent slave through the coupling isolator 4;
the last slave's code transmitting module 3 codes the slave's digital serial communication protocol signal into a differential zero-crossing or zero-return pulse signal and transmits it to the master through the coupling isolator 4.
According to the isolated serial interface communication device provided by the embodiment, the digital serial communication protocol signals are encoded into the differential zero-crossing or zero-return pulse signals, and the differential zero-crossing or zero-return pulse signals are transmitted and received through the coupling isolator, so that the encoding quantity in the data transmission process is effectively reduced, the communication stability is improved, the higher data transmission rate can be ensured, the communication robustness is enhanced, and the probability of error codes is reduced.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (10)
1. An isolated serial interface communication device, comprising:
the communication port of each digital serial communication module is electrically connected with the code sending module and the code receiving module;
the coupling isolator is arranged between any two adjacent digital serial communication modules;
the code transmitting module is used for encoding the digital serial communication protocol signals of the digital serial communication module which are electrically connected with the code transmitting module into differential zero crossing or zero returning pulse signals and transmitting the differential zero crossing or zero returning pulse signals through the coupling isolator;
the code receiving module is used for receiving the differential zero crossing or zero returning pulse signals of the coupling isolator, converting the differential zero crossing or zero returning pulse signals into corresponding digital serial communication protocol signals and sending the corresponding digital serial communication protocol signals to the digital serial communication module which is electrically connected with the code receiving module.
2. The apparatus of claim 1, wherein the at least two digital serial communication modules comprise a master and at least one slave;
when the number of the at least one slave is more than one, the at least two digital serial communication modules are electrically connected to each other end to end in a daisy-chain manner.
3. The apparatus of claim 2, wherein each slave is provided with a differential zero crossing or return-to-zero pulse signal inlet and a differential zero crossing or return-to-zero pulse signal outlet;
and a coupling isolator is arranged on a pair of transmission lines electrically connecting the differential zero crossing or zero return pulse signal inlet and the differential zero crossing or zero return pulse signal outlet.
4. A device according to claim 3, wherein the coupling isolator is a transformer isolator or a capacitive isolator.
5. The apparatus of claim 1, wherein the digital serial communication protocol is a full duplex, synchronous communication, and wherein the communication interface comprises a chip select, clock, input and output interface.
6. The apparatus of claim 5, wherein the digital serial communication protocol is the SPI protocol.
7. The apparatus of claim 6, wherein the encoding rules followed by the encoding transmit module and the encoding receive module are:
the chip select valid signal is represented as two consecutive zero-crossing negative going pulses;
a logic low level of communication data at the rising edge of the clock is represented as a negative-return-zero-positive pulse;
the communication data being a logic high level at the rising edge of the clock is represented as a positive-return-to-zero-negative pulse;
the chip select disable signal is represented as two consecutive zero crossing positive going pulses.
8. A method of isolated serial interface communication in an apparatus as claimed in any one of claims 1 to 7, comprising:
each code transmitting module codes the digital serial communication protocol signal of the digital serial communication module where the code transmitting module is positioned into a differential zero crossing or zero returning pulse signal and transmits the differential zero crossing or zero returning pulse signal to the next adjacent digital serial communication module through a coupling isolator;
each code receiving module receives the differential zero crossing or zero returning pulse signal sent to the coupling isolator by the last adjacent digital serial communication module, converts the differential zero crossing or zero returning pulse signal into a corresponding digital serial communication protocol signal and then sends the corresponding digital serial communication protocol signal to the digital serial communication module where the digital serial communication module is located.
9. The method as recited in claim 8, further comprising: the encoding and transmitting module of the host encodes the digital serial communication protocol signal of the host into a differential zero crossing or zero returning pulse signal and transmits the differential zero crossing or zero returning pulse signal to adjacent slaves through a coupling isolator;
in addition to the slaves adjacent to the master, the code receiving module of each slave receives the differential zero crossing or return zero pulse signal sent from the last adjacent slave to the coupling isolator, converts the differential zero crossing or return zero pulse signal into a corresponding digital serial communication protocol signal and then sends the digital serial communication protocol signal to the slave where the differential zero crossing or return zero pulse signal is located.
10. The method as recited in claim 9, further comprising:
the method comprises the steps that except for the last slave machine, a code sending module of each slave machine codes a digital serial communication protocol signal of the slave machine into a differential zero-crossing or zero-return pulse signal, and sends the differential zero-crossing or zero-return pulse signal to the next adjacent slave machine through a coupling isolator;
the last slave machine code transmitting module codes the slave machine digital serial communication protocol signal into a differential zero crossing or zero returning pulse signal, and transmits the differential zero crossing or zero returning pulse signal to the master machine through the coupling isolator.
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| CN217467047U (en) * | 2022-02-24 | 2022-09-20 | 北京经纬恒润科技股份有限公司 | Electronic product testing device |
| CN116107940A (en) * | 2021-11-10 | 2023-05-12 | 固纬电子实业股份有限公司 | Isolation device for image digital signal |
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| CN116107940A (en) * | 2021-11-10 | 2023-05-12 | 固纬电子实业股份有限公司 | Isolation device for image digital signal |
| CN217467047U (en) * | 2022-02-24 | 2022-09-20 | 北京经纬恒润科技股份有限公司 | Electronic product testing device |
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