CN103684943A - Bus system with power supply transmission and data communication functions - Google Patents
Bus system with power supply transmission and data communication functions Download PDFInfo
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- CN103684943A CN103684943A CN201210318385.7A CN201210318385A CN103684943A CN 103684943 A CN103684943 A CN 103684943A CN 201210318385 A CN201210318385 A CN 201210318385A CN 103684943 A CN103684943 A CN 103684943A
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Abstract
The invention discloses a bus system with power supply transmission and data communication functions. The bus system is low in cost and has a simple structure, can realize power supply transmission and data communication at a larger range and can also support bus arbitration of a physical layer. The bus system is composed of a pair of differential buses, a power supply module and two or more than two communication modules, wherein the power supply module is connected onto the differential buses, and the communication modules are connected onto the differential buses. The bus system does not use a termination resistor for impedance matching.
Description
Technical field
The present invention relates to electronic communication field, relate in particular to and a kind ofly can carry out the bus system of digital communication and power delivery simultaneously.
Background technology
In Industry Control, the application scenarios such as Smart Home, Internet of Things, are used wire communication and when distant, in order to reduce the cable cost of network, often need to, on a pair of cable, carry out data communication and power delivery simultaneously.IEC61158-2 standard is formulated in order to carry out data communication and power delivery on a pair of cable simultaneously.This standard is carried out the transmission of power supply by power supply and the load of current source type; Data, by the mode of increment current, form potential pulse in bus, realize the concurrent of power delivery and data communication.But this standard also has obvious defect, the first, the electric current of standard-required communication node can not suddenly change, and causes the design of node to be restricted; The second, this standard can not be supported the bus arbitration of physical layer, can cause communication efficiency to decline when number of nodes is more.
Chinese invention patent " power supply, data-signal, the time-multiplexed monobus communication system of audio analog signals " (application number 201010125972.5) discloses a kind of bus system of power delivery, data communication and voice communication simultaneously, in a pair of bus, realized power supply, the transmission of data and voice, and bus interface circuit is simple in structure, with low cost.But there is following defect in this patent: the first, and 2 impedance matching resistance of cross-over connection in bus, when bus operating voltage is higher, this resistance can consume very large power, has reduced bus-powered efficiency, has limited operating voltage and the communication distance of bus; The second, the communication module in bus can consume the electric weight of self storing and go to drive bus in communication, and driving power is larger, causes communication module must contain large-scale energy-storage travelling wave tube, is unfavorable for further reducing costs.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, power supply/communication bus system a kind of with low cost, simple in structure is proposed, communication distance that not only can be more farther than existing techniques in realizing, support more powerful bus-poweredly, and support the bus arbitration of physical layer.
Bus system of the present invention, by a pair of differential bus, be connected to a supply module on this differential bus and be connected on this differential bus two or more communication module formed, do not comprise the terminal resistance for impedance matching.
Described differential bus, comprises 2 holding wires of positive and negative, connects described supply module and communication module, is the common medium of power delivery and data communication.
Described supply module, by differential bus, provides working power to the communication module in bus.
Described communication module, obtains from described differential bus the required power supply of self working, and can pass through described differential bus, carries out each other data communication.
Bus system of the present invention is periodically worked, and a complete work period can be divided into 2 time slots, is respectively power supply time slot and communication time slot, and 2 time slots alternately occur in bus.
At power supply time slot, supply module output differential voltage drive bus, export synchronizing signal and power supply, and bus driver is a high level the most at last in bus; Communication module receives above-mentioned synchronizing signal at power supply time slot, and obtains working power from bus.
At communication time slot, supply module is abandoned the driving to bus, by the communication module as transmitting terminal, according to the data of required transmission, optionally, by the positive and negative holding wire short circuit of differential bus, make the differential voltage in bus present different variations with the data difference sending.
At communication time slot, as the communication module of receiving terminal, the variation according to differential voltage in bus, recovers data, completes data receiver.
Above-mentioned power supply time slot, is further divided into 2 stages, is respectively drop-down stage and driving stage, and wherein in the drop-down stage of power supply time slot, the positive and negative holding wire of supply module short circuit differential bus, makes the differential voltage on differential bus lower; In the driving stage of power supply time slot, the differential bus described in differential voltage drive for supply module, uprises differential voltage on differential bus.
The variation edge of above-mentioned differential voltage, can be detected by communication module, and using this edge as bus synchronous signal, for the sending and receiving of data.
The inside of communication module comprises energy-storage travelling wave tube, and in the driving stage of power supply time slot, communication module obtains power supply from bus. and be stored on inner energy-storage travelling wave tube, as being the working power of self; In this phase communication module, can also absorb the reflected voltage on described differential bus and be stored on inner energy-storage travelling wave tube, obtaining extra power supply supply.
Communication module inside comprises a gate-controlled switch, can be by the positive and negative holding wire short circuit of differential bus.Initial at communication time slot, owing to there is no external drive, bus voltage remains the power drives time slot high-voltage state in latter stage.In communication time slot, as the communication module of data sending terminal, according to the information of required transmission, whether select short circuit differential bus, thereby make according to the difference of the information of transmission, to present different differential voltages in bus.And as the communication module of data receiver, in communication time slot, can detect above-mentioned differential voltage, recover the data that transmitting terminal sends.
Bus system support bus arbitration of the present invention allows a plurality of communication modules to send data simultaneously.In described bus system, there is more than one communication module simultaneously when sending different data for data sending terminal, communication module as transmitting terminal, when sending, receive the data on differential bus and contrast with the data that self send out, when finding that above-mentioned two data are inconsistent, this communication module has just been obtained bus the information of conflict, and can be by ending the method for current transmit operation, by bus, give other communication modules, realized bus arbitration.
Bus system of the present invention, can select operating voltage flexibly.By improving operating voltage, just can improve at an easy rate power delivery power, improve noise margin and increase communication distance.
Bus system of the present invention, compared with the prior art, has higher noise margin, can realize farther communication distance, support bus arbitration, and interface circuit is simple and reliable, with low cost, can be widely used in industry control, security protection, Smart Home, the scenes such as sensor network.
Accompanying drawing explanation
Fig. 1 is composition and the annexation schematic diagram of bus system of the present invention.
Fig. 2 is that work period and the time slot of bus system of the present invention divided schematic diagram.
Fig. 3 is the circuit theory schematic diagram of a specific embodiment of supply module of the present invention.
Fig. 4 is the voltage waveform view of the specific embodiment of above-mentioned supply module in when work.
Fig. 5 is the circuit theory schematic diagram of a specific embodiment of communication module of the present invention.
Fig. 6 is the specific embodiment of above-mentioned communication module, the voltage waveform view while working as receiving terminal.
Fig. 7 is the specific embodiment of above-mentioned communication module, the voltage waveform view while working as transmitting terminal.
Fig. 8 is in bus system of the present invention, and two communication modules are carried out the operation principle schematic diagram of bus arbitration.
Embodiment
At Fig. 1, be composition and the annexation schematic diagram of bus system described in the invention.As can be seen from the figure, whole system is by a pair of differential bus, and the supply module and a plurality of communication module that are connected on differential bus form.In the present embodiment, the positive and negative holding wire of differential bus is named as respectively BUS+ and BUS-.Need to be ben, in bus system described in the invention, do not use terminal resistance.
Fig. 2 divides schematic diagram the bus cycles of bus system described in the invention, and each work period is divided into power supply time slot and two parts of communication time slot, and wherein, power supply time slot is divided into again two stages, is respectively drop-down stage and driving stage.
In the present embodiment, the signal of the principle of supply module as shown in Figure 3.Described supply module is comprised of the resistance of control circuit U1, two optocoupler OC1 and OC2, three switch element T1, T2 and T3 and several peripheries.Wherein, control chip can use programmable logic device (PLD) to realize, and also can use other method, as realizations such as microcontrollers (MCU).
In the drop-down stage of power supply time slot, the control signal CT1 that control chip U1 outputs to OC1 is low level, and the control signal CT2 that outputs to OC2 is high level.Can allow like this OC1, T1 and not conductings of T3, and allow OC2 and T2 conducting, BUS+ and BUS-are shorted together by T2, the differential voltage in bus is lower.
In the driving stage of power supply time slot, the control signal CT1 that control chip outputs to OC1 is high level, and the control signal CT2 that outputs to OC2 is low level.Can allow like this OC2 and not conducting of T2, and allow OC1, T1 and T3 conducting, thus by+12V and-differential voltage of 12V be added in BUS+ and BUS-upper, the differential voltage in bus is elevated to 24V.
At communication time slot, two control signals of supply module control chip U1 output are low level, T1, T2 and not conductings of T3.If there is no transfer of data in bus, just there is no external drive, bus will keep power supply time slot to drive the high-voltage state in stage constant.
Fig. 4 has done further instruction to the operation principle of above-mentioned supply module, provided while there is no transfer of data in bus, control signal CT1, the CT2 of supply module control chip U1 output and the sequential relationship of bus voltage waveform, comprised two work periods.
Fig. 5 is the theory diagram of communication module.Communication module is by power circuit, and receiving circuit, transtation mission circuit and communication control circuit totally four parts form.Wherein, communication control circuit U1, by microcontroller implementation, also can be realized by additive methods such as programmable logic devices.
In Fig. 5, the power circuit of communication module comprises diode D1, D2, capacitor C 1, C2, voltage-stabiliser tube Z1, Z2, resistance R 1, R2.D1, D2 and C1 in driving stage of power supply time slot from bus power taking and store; R1, R2 and Z1, Z2 form voltage stabilizing circuit, export a stable voltage, then by after C2 filtering, as the working power of communication module.Wherein, R1 is identical with R2 value, and Z1 is identical with Z2 model, no matter so just can guarantee the voltage height of BUS+ and BUS-, as long as generating positive and negative voltage full symmetric, the place of working of communication module just can remain on the central point of BUS+ and BUS-voltage, remains ground level and stablizes constant.
In Fig. 5, the receiving circuit of communication module, only comprises 4 divider resistance R3/R4/R5 and R6, for by the high voltage waveform on BUS+ and BUS-, carries out in proportion dividing potential drop, is converted to the suitable logic level that communication control chip can receive.Wherein, R3 is identical with R6 value, and R4 is identical with R5 value, no matter so just can guarantee the voltage height of BUS+ and BUS-, as long as generating positive and negative voltage full symmetric, the central point of BUS+ and BUS-voltage just remains ground level and stablizes constantly, has further guaranteed the stable of communication module place of working.
In Fig. 5, the radiating circuit of communication module is comprised of optocoupler OC1 and transistor T 1.In the time of need to sending data 0, at communication time slot, control circuit allows T1 conducting by OC1, and short circuit BUS+ and BUS-, make differential voltage step-down in bus.When needs send data 1, T1 is in the not conducting of whole communication time slot, and now differential bus does not have external drive, and the differential voltage in bus keeps high level constant.
In Fig. 5, communication control circuit is decoded and draws digital information the RX signal of receiving circuit output.When positive pulse is wider in bus, represent that transtation mission circuit does not have short circuit bus, the data that receive are 1; When positive pulse in bus is narrower, the differential bus that represented transtation mission circuit short circuit, the data that receive are 0.Fig. 6 is an example, shown receive signal RX waveform and received data between the two between corresponding relation.
In Fig. 5, communication control circuit is also according to the data of required transmission, and output TX signal is to transtation mission circuit.At communication time slot, when needs send data 0, output TX is high level, and short circuit differential bus makes differential voltage step-down in bus; When needs send data 1, output TX is low level, short circuit differential bus not, and it is constant that bus remains high level.Fig. 7 is an example, has shown the data, the control signal TX voltage waveform that send, and the corresponding relation between bus differential voltage waveform three.
In bus system, have 2 or more communication module simultaneously when sending data in bus, this bus system can realize bus arbitration.This arbitration is based on " line with " principle, as long as have communication module send data 0(at communication time slot by differential bus short circuit), the differential voltage in bus will reduce, now, send the communication module of data 1, can, by the voltage in testbus, find that bus is drop-down by other communication module, initiatively exit transmission, abdicate the right to use of bus.
Fig. 8 be one by 2 usufructuary examples of communication module competition bus.Wherein, the data that modules A attempt sends are binary one 0101100(order for from left to right), and the data of module B attempt transmission are binary one 0110011(order for from left to right).At front 3 bits 101, because the data that 2 modules send are identical, any conflict can not be detected; To the 4th bit, modules A sends 0, at communication time slot by bus short circuit, and although module B does not have short circuit bus, but the low-voltage in bus (dash area in reference diagram) detected, according to this information, module B can learn that other communication modules are taking bus, stops immediately sending 4 follow-up BIT; So, in the 5th to the 8th these 4 work periods below, by modules A, monopolize bus, by sending on differential bus of 4 bits 1100.
Claims (4)
1. a kind of, can complete power delivery, can carry out again the bus system of wired data communication, comprise a pair of differential bus, and be connected to a supply module and at least two communication modules on this differential bus, it is characterized in that:
In described bus system, do not comprise the terminal resistance for impedance matching;
Described supply module, by differential bus, provides working power to the communication module in bus;
Described communication module, obtains from described differential bus the required power supply of self working, and by described differential bus, is carrying out each other data communication;
Described bus system is periodically worked, and a complete work period is divided into 2 time slots, is respectively power supply time slot and communication time slot, and wherein power supply time slot can be further divided into again drop-down stage and driving stage;
At described power supply time slot, supply module is exported synchronizing signal and power supply in bus, and bus driver is high level the most at last;
At described power supply time slot, communication module receives above-mentioned synchronizing signal from bus, and obtains working power;
At described communication time slot, supply module is abandoned the driving to bus, by the communication module as transmitting terminal, according to the data of required transmission, whether select the positive and negative holding wire of short circuit differential bus, make bus present different differential voltages with the data that send are different;
At described communication time slot, as the communication module of receiving terminal, according to the change in voltage on differential bus, judge the data that transmitting terminal sends, complete reception.
2. supply module according to claim 1, is characterized in that:
Described supply module is in the drop-down stage of power supply time slot, and the positive and negative holding wire of short circuit differential bus, makes the differential voltage on differential bus lower;
Described supply module, in the driving stage of power supply time slot, is used differential voltage drive bus, and the differential voltage in bus is uprised;
Described supply module, at communication time slot, does not drive bus.
3. communication module according to claim 1, is characterized in that:
Described communication module is driving during the stage in the drop-down phase transition of power supply time slot, the rising edge of differential voltage can be detected, and usings this synchronizing signal as communication;
Described communication module, inside comprises energy-storage travelling wave tube, at power drives time slot, can obtain power supply from bus, and is stored on inner energy-storage travelling wave tube, as being the working power of self;
Described communication module, at power drives time slot, can also absorb the reflected voltage of rising edge and be stored on inner energy-storage travelling wave tube, obtains extra power supply supply;
Described communication module is during as data sending terminal, at communication time slot, according to the information of required transmission, whether selects short circuit differential bus, with the variation of differential voltage on control bus;
Described communication module is during as data receiver, at communication time slot, can testbus on the variation of differential voltage, and according to the result detecting, recover the data that transmitting terminal sends.
4. bus system according to claim 1, when a plurality of communication modules send data simultaneously, can detect bus collision, realizes bus arbitration, it is characterized in that:
Described communication module, when sending each bit of data, receives the data in bus and contrasts with the data that self send out, and when finding that above-mentioned two data are inconsistent, this communication module is just stopped current transmit operation, abdicates the right to use of bus;
Described communication module, bus collision being detected and abdicating after the bus right to use, through a random time interval, can send data to bus again.
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| CN201210318385.7A CN103684943A (en) | 2012-09-02 | 2012-09-02 | Bus system with power supply transmission and data communication functions |
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| CN201210318385.7A CN103684943A (en) | 2012-09-02 | 2012-09-02 | Bus system with power supply transmission and data communication functions |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105721546A (en) * | 2016-01-20 | 2016-06-29 | 冶金自动化研究设计院 | Multi-data integration service platform based on industrial Internet of Things (IoT) communication |
| CN107256199A (en) * | 2017-06-05 | 2017-10-17 | 上海爱信诺航芯电子科技有限公司 | A kind of monobus circuit of low-power consumption |
| CN107678995A (en) * | 2017-09-26 | 2018-02-09 | 歌尔科技有限公司 | Data communications method and electronic equipment |
| CN109641720A (en) * | 2016-08-24 | 2019-04-16 | 因温特奥股份公司 | For determining the method and test device of the state of the suspension traction device of elevator system |
| CN110635981A (en) * | 2018-06-20 | 2019-12-31 | 英飞凌科技股份有限公司 | Drive device for a differential bus and corresponding method |
| CN111324569A (en) * | 2020-02-24 | 2020-06-23 | 宁波拓邦智能控制有限公司 | Multi-machine communication synchronization system, multi-machine communication synchronization method and electric appliance |
| CN111581145A (en) * | 2020-04-14 | 2020-08-25 | 北京旋极信息技术股份有限公司 | Bus communication system and method |
| CN114144996A (en) * | 2019-06-03 | 2022-03-04 | 罗伯特·博世有限公司 | Device for a subscriber station of a serial bus system and method for communication in a serial bus system |
| CN118018356A (en) * | 2024-04-08 | 2024-05-10 | 武汉派呦科技有限公司 | Power supply communication system based on two-bus time-sharing multiplexing |
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2012
- 2012-09-02 CN CN201210318385.7A patent/CN103684943A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105721546A (en) * | 2016-01-20 | 2016-06-29 | 冶金自动化研究设计院 | Multi-data integration service platform based on industrial Internet of Things (IoT) communication |
| CN109641720A (en) * | 2016-08-24 | 2019-04-16 | 因温特奥股份公司 | For determining the method and test device of the state of the suspension traction device of elevator system |
| CN107256199B (en) * | 2017-06-05 | 2021-02-19 | 上海爱信诺航芯电子科技有限公司 | Single bus circuit with low power consumption |
| CN107256199A (en) * | 2017-06-05 | 2017-10-17 | 上海爱信诺航芯电子科技有限公司 | A kind of monobus circuit of low-power consumption |
| CN107678995A (en) * | 2017-09-26 | 2018-02-09 | 歌尔科技有限公司 | Data communications method and electronic equipment |
| CN107678995B (en) * | 2017-09-26 | 2024-04-02 | 歌尔科技有限公司 | Data communication method and electronic equipment |
| CN110635981A (en) * | 2018-06-20 | 2019-12-31 | 英飞凌科技股份有限公司 | Drive device for a differential bus and corresponding method |
| CN114144996B (en) * | 2019-06-03 | 2023-07-28 | 罗伯特·博世有限公司 | Apparatus for subscriber station of serial bus system and method for communication in serial bus system |
| CN114144996A (en) * | 2019-06-03 | 2022-03-04 | 罗伯特·博世有限公司 | Device for a subscriber station of a serial bus system and method for communication in a serial bus system |
| CN111324569A (en) * | 2020-02-24 | 2020-06-23 | 宁波拓邦智能控制有限公司 | Multi-machine communication synchronization system, multi-machine communication synchronization method and electric appliance |
| CN111581145A (en) * | 2020-04-14 | 2020-08-25 | 北京旋极信息技术股份有限公司 | Bus communication system and method |
| CN118018356A (en) * | 2024-04-08 | 2024-05-10 | 武汉派呦科技有限公司 | Power supply communication system based on two-bus time-sharing multiplexing |
| CN118018356B (en) * | 2024-04-08 | 2024-06-07 | 武汉派呦科技有限公司 | Power supply communication system based on two-bus time-sharing multiplexing |
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Application publication date: 20140326 |