CN102723970A - Signal transmission method and system on basis of two-wire bus capable of supplying power - Google Patents

Signal transmission method and system on basis of two-wire bus capable of supplying power Download PDF

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Publication number
CN102723970A
CN102723970A CN2012102377319A CN201210237731A CN102723970A CN 102723970 A CN102723970 A CN 102723970A CN 2012102377319 A CN2012102377319 A CN 2012102377319A CN 201210237731 A CN201210237731 A CN 201210237731A CN 102723970 A CN102723970 A CN 102723970A
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voltage
signal
amplitude
supply
variation
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CN102723970B (en
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肖伏初
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HUNAN YIMAIDE TECHNOLOGY Co Ltd
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HUNAN YIMAIDE TECHNOLOGY Co Ltd
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Abstract

The invention discloses a signal transmission method and system on the basis of a two-wire bus capable of supplying power. The signal transmission method is characterized in that analog signals and/or digital signals are transmitted to the system consisting of the two-wire bus, a plurality of nodes connected with the bus, and a voltage source for supplying a first power supply current to the bus, and a power supply voltage supplied to the two-wire bus by the voltage source changes along with the change of the first power supply current; and the nodes transmit current loop signals to the two-wire bus, receive voltage signals from the two-wire bus and absorb constant currents from the two-wire bus. The signal transmission method and system realize the transmission of the analog signals, the digital signals and the signals of a power supply with large power in a two-wire bus system capable of supplying power, so that the two-wire bus system capable of supplying power in the future simultaneously has capacities of digital communication, voice communication and large electrical load drive, thus having great significance on a self-distribution communication and control system needing to provide call and communication functions simultaneously.

Description

A kind of method for transmitting signals and system based on the power supply two-line system bus
Technical field
The invention belongs to method for transmitting signals and system, be specifically related to a kind of method for transmitting signals and system based on the power supply two-line system bus.
Background technology
In communication and control field, transmit the two-wire system bus system technology of power supply and signal simultaneously, be numerous engineers and technicians' Focal Point of Common Attention in the field always.
On power line, carrying out the carrier signal stack is a kind of conventional method; But owing to be difficult to adopt the effective isolation measure; Carrier signal will be powered circuit and power circuit is significantly decayed; Thereby cause that signal transmission distance is short, communication speed is low, the node capacity is little, to the appearance of problems such as power supply unit and power consumption equipment performance requirement height.In view of this; The patent of a " power supply, data-signal, the time-multiplexed monobus communication system of audio analog signals " by name (application number: 201010125972.5) proposed the method that power supply and signal are transmitted in a kind of timesharing; When transmission signals, break off power supply and power circuit, thereby efficiently solve the fading problem of signal.But not enough below still existing: 1) the power delivery time has only 1/3rd, and efficient is low and stationarity is poor, and electromagnetic interference is big; 2) had only for 1/3rd times transmitted data, communication speed is low; 3) for the transmission of audio analog signal, according to the Nai Shi law, the switching frequency of signal must not be lower than 20KHZ, causes the complicated circuit of technology realization, is difficult to the economy and the reliability of the system that takes into account.
Summary of the invention
The object of the present invention is to provide a kind of method for transmitting signals and system, can't harm transmission of analogue signal on a pair of current supply line or/and digital signal solves the reciprocity transmission problem of signal between communication node simultaneously to be implemented in based on the power supply two-line system bus.
Method for transmitting signals based on the power supply two-line system bus provided by the invention; Be one by the two-wire system bus, be connected the some nodes on this bus and transmission of analogue signal in the system that the voltage source of first supply current constitutes be provided or/and digital signal to this bus, supply power voltage that said voltage source provides to the two-wire system bus is changed with the variation of first supply current; Make said node send the electric current loop signal, receive voltage signal from the two-wire system bus, from the total line absorption constant current of two-wire system to the two-wire system bus.
Said method for transmitting signals based on the power supply two-line system bus; Said system also comprises some second DC current sources that second supply current is provided to the two-wire system bus, makes the said second supply current sum less than the constant current sum of said node from the total line absorption of two-wire system.
The method of said transmission of analogue signal is:
Make said supply power voltage with the rule that the variation of first supply current changes be: the amplitude that supply power voltage changes is directly proportional with the amplitude that first supply current changes, and the phase place of the phase place of variation and the variation of first supply current is opposite;
The amplitude that the electric current loop signal that said node is sent to the two-wire system bus changes is directly proportional with the amplitude that analog voltage signal to be sent changes;
Making said node is analog voltage signal from the voltage signal that the two-wire system bus receives, and the amplitude that this analog voltage signal changes is directly proportional with the amplitude that supply power voltage changes, and the phase place that the phase place of variation and supply power voltage change is opposite.
The method of said transmission of digital signals is:
Make said supply power voltage with the rule that the variation of first supply current changes be: when first supply current reduces or amplitude of variation during less than the predetermined value of the first supply current amplitude of variation, supply power voltage is the predetermined peak of supply power voltage; When first supply current increases and amplification during greater than the predetermined value of the first supply current amplitude of variation, supply power voltage is the supply power voltage predetermined lowest value;
Electric current loop signal that said node sends to the two-wire system bus is changed with the logic of digital voltage signal to be sent and saltus step and hopping amplitude greater than the predetermined value of the first supply current amplitude of variation;
Making said node is digital voltage signal from the voltage signal that the two-wire system bus receives, and logical AND the logic when supply power voltage be supply power voltage predetermined lowest value of this digital voltage signal when supply power voltage is the predetermined peak of supply power voltage is opposite.
The method of said transmission of digital signals is:
Make said supply power voltage be: when first supply current reduces or amplitude of variation during less than the predetermined value of the first supply current amplitude of variation with the rule that the variation of first supply current changes; The polarity of supply power voltage is the supply power voltage predetermined polarity; When first supply current increases and amplification during greater than the predetermined value of the first supply current amplitude of variation polarity inversion of supply power voltage;
Electric current loop signal that said node sends to the two-wire system bus is changed with the logic of digital voltage signal to be sent and saltus step and hopping amplitude greater than the predetermined value of the first supply current amplitude of variation;
Making said node is digital voltage signal from the voltage signal that the two-wire system bus receives, and the logic of the logical AND of this digital voltage signal when supply power voltage polarity is the supply power voltage predetermined polarity when supply power voltage polarity inversion is opposite.
The method of said transmission of analogue signal and digital signal is the timesharing transmission, and the method for said timesharing transmission is:
Make said supply power voltage with the rule that the variation of first supply current changes be: the amplitude that changes when first supply current is during less than the predetermined value of the first supply current amplitude of variation, and supply power voltage variation and amplitude of variation in the supply power voltage preset range are directly proportional with the amplitude of first supply current variation; When first supply current reduces and amount of decrease during greater than the predetermined value of the first supply current amplitude of variation, supply power voltage is the predetermined peak of supply power voltage; When first supply current increases and amplification during greater than the predetermined value of the first supply current amplitude of variation, supply power voltage is the supply power voltage predetermined lowest value; The lower limit of said supply power voltage preset range is higher than the supply power voltage predetermined lowest value;
The electric current loop signal that said node is sent to the two-wire system bus satisfies: when sending analog signal; The amplitude of variation of electric current loop signal is directly proportional with the amplitude of variation of analog voltage signal to be sent, and the amplitude of variation of electric current loop signal sum is less than the predetermined value of the first supply current amplitude of variation; When sending digital signal, the electric current loop signal change with the logic of digital voltage signal to be sent and saltus step and hopping amplitude greater than the predetermined value of the first supply current amplitude of variation;
Said node is satisfied from the voltage signal that the two-wire system bus receives: when transmission of analogue signal, the voltage signal of reception is an analog voltage signal, and the amplitude that this analog voltage signal changes is directly proportional with the amplitude that supply power voltage changes; When transmission of digital signals, the voltage signal of reception is a digital voltage signal,
The logical AND of this digital voltage signal when supply power voltage changes in the supply power voltage preset range is that the logic of the predetermined peak of supply power voltage equates at supply power voltage, but opposite with logic when supply power voltage is the supply power voltage predetermined lowest value.
The method of the timesharing transmission in said transmission of analogue signal and the digital signal method is:
Make said supply power voltage with the rule that the variation of first supply current changes be: the amplitude that changes when first supply current is during less than the predetermined value of the first supply current amplitude of variation; The polarity of supply power voltage is the predetermined polarity of supply power voltage; The amplitude that supply power voltage changes is directly proportional with the amplitude that first supply current changes, and the phase place that the phase place of variation and first supply current change is opposite; When first supply current reduces and amount of decrease during greater than the predetermined value of the first supply current amplitude of variation, the polarity of supply power voltage is the supply power voltage predetermined polarity; When first supply current increases and amplification during greater than the predetermined value of the first supply current amplitude of variation polarity inversion of supply power voltage;
The electric current loop signal that said node is sent to the two-wire system bus satisfies: when sending analog signal; The amplitude of variation of electric current loop signal is directly proportional with the amplitude of variation of analog voltage signal to be sent, and the amplitude of variation of electric current loop signal sum is less than the predetermined value of the first supply current amplitude of variation; When sending digital signal, the electric current loop signal change with the logic of digital voltage signal to be sent and saltus step and hopping amplitude greater than the predetermined value of the first supply current amplitude of variation;
Said node is satisfied from the voltage signal that the two-wire system bus receives: when transmission of analogue signal, the voltage signal of reception is an analog voltage signal, and the amplitude of variation of this analog voltage signal is directly proportional with the amplitude of variation of supply power voltage; When transmission of digital signals, the voltage signal of reception is a digital voltage signal, and the logic of the logical AND of this digital voltage signal when supply power voltage polarity is the supply power voltage predetermined polarity when supply power voltage polarity inversion is opposite.
Signal transmission system based on the power supply two-line system bus provided by the invention comprises the two-wire system bus, is connected the some nodes on this bus and the voltage source of first supply current is provided to this bus; Said voltage source comprises: direct voltage source is used for to following Flow Control voltage fed; The Flow Control voltage source is used for the supply power voltage that provides the variation with first supply current to change to the two-wire system bus; Said node comprises: voltage-controlled current source is used for sending the electric current loop signal to the two-wire system bus; First DC current source is used for from the total line absorption constant current of two-wire system; Demultiplexer is used for isolating voltage signal to be received from the supply power voltage of two-wire system bus; Signal generator is used for to voltage-controlled current source voltage signal to be sent being provided; Power circuit is used for from the first DC current source power taking and to each circuit of node working power being provided; Signal processor is used for the voltage signal that the processing signals separator is received; Polarity switching is used to change the two-wire system polarity of bus and the signalling channel of fixed polarity is provided to each circuit of node.
Said Flow Control voltage source comprises: current sampling circuit is used for the first supply current conversion of signals is become the sampling voltage signal; Ac-coupled circuit is used for isolating the sampling ac voltage signal from the sampling voltage signal; Control circuit is used for from the extraction of sampling ac voltage signal and to following controlled voltage source output control voltage signal; Controlled voltage source is used to produce the supply power voltage that changes with the control voltage signal.
System of the present invention can adopt the Different control circuit according to the transmission various signals.
During transmission of analogue signal, said control circuit comprises: the first anti-phase ratio amplifying circuit is used for amplifying the sampling ac voltage signal and exporting the aanalogvoltage control signal; Said controlled voltage source comprises: adjustable linear voltage-stabilizing circuit, the supply power voltage that is used to provide the variation with the aanalogvoltage control signal to change; Said voltage-controlled current source comprises: the linear current source circuit is used for the electric current loop signal that output amplitude is directly proportional with analog voltage signal amplitude to be sent; Said demultiplexer comprises: the second anti-phase ratio amplifying circuit is used for anti-phase and amplifies the ac voltage signal of supply power voltage and the analog voltage signal that output is received.
During transmission of digital signals, said control circuit comprises: first voltage comparator circuit, and ac voltage signal amplitude and export the digital voltage control signal is used for relatively taking a sample; Said controlled voltage source comprises: adjustable voltage stabilizing circuit, the supply power voltage that is used to provide the height with digital voltage control signal level to change; Said voltage-controlled current source comprises: current source circuit, be used for output amplitude with the saltus step of the logic level of digital voltage signal to be sent the electric current loop signal of saltus step; Said demultiplexer comprises: second voltage comparator circuit is used for the digital voltage signal that comparison supply power voltage amplitude of variation and output are received.
When timesharing transmission of analogue signal and digital signal; Said control circuit comprises: the first anti-phase ratio amplifying circuit; Be used to amplify the output signal of sampling ac voltage signal and following ternary output window voltage comparator circuit, export aanalogvoltage control signal and digital voltage control signal simultaneously; The 3rd anti-phase ratio amplifying circuit is used for amplifying the sampling ac voltage signal and to following ternary output window voltage comparator circuit the comparison input voltage signal is provided; Ternary output window voltage comparator circuit is used for the comparative voltage excursion and exports high level, low level and three kinds of signals of high resistant according to the result to the above-mentioned first anti-phase ratio amplifying circuit; Said controlled voltage source comprises: adjustable linear voltage-stabilizing circuit, the supply power voltage that is used to provide the variation with the aanalogvoltage control signal to change; The H bridge circuit that contains driving is used for changing the polarity that changes supply power voltage according to the height of digital voltage control signal level; Said voltage-controlled current source comprises: the linear current source circuit is used for the electric current loop signal that output amplitude is directly proportional with analog voltage signal amplitude to be sent; Current source circuit, be used for output amplitude with the saltus step of the logic level of digital voltage signal to be sent the electric current loop signal of saltus step; Said demultiplexer comprises: the second anti-phase ratio amplifying circuit is used for anti-phase and amplifies the ac voltage signal of supply power voltage and the analog voltage signal that output is received; Second voltage comparator circuit is used for the digital voltage signal that comparison supply power voltage amplitude of variation and output are received.
The invention described above system, the diverse location that also is included on the two-wire system bus is provided with several provide second DC current source from second operating current to the two-wire system bus.
For the system of the present invention that does not comprise said second DC current source, can also adopt following Different control circuit according to the transmission various signals.
During transmission of digital signals, said control circuit comprises: first voltage comparator circuit, and ac voltage signal amplitude and export the digital voltage control signal is used for relatively taking a sample; Said controlled voltage source comprises: contain the H bridge circuit of driving, be used for changing the polarity that changes supply power voltage according to the height of digital voltage control signal level; Said voltage-controlled current source comprises: current source circuit, be used for output amplitude with the saltus step of the logic level of digital voltage signal to be sent the electric current loop signal of saltus step; Said demultiplexer comprises: the tertiary voltage comparison circuit is used to discern supply power voltage polarity and exports the digital voltage signal of receiving.
When timesharing transmission of analogue signal and digital signal, said control circuit comprises: the first anti-phase ratio amplifying circuit is used for amplifying the sampling ac voltage signal and exporting the aanalogvoltage control signal; First voltage comparator circuit, ac voltage signal amplitude and export the digital voltage control signal is used for relatively taking a sample; Said controlled voltage source comprises: adjustable linear voltage-stabilizing circuit, the supply power voltage that is used to provide the variation with the aanalogvoltage control signal to change; The H bridge circuit that contains driving is used for changing the polarity that changes supply power voltage according to the height of digital voltage control signal level; Said voltage-controlled current source comprises: the linear current source circuit is used for the electric current loop signal that output amplitude is directly proportional with analog voltage signal amplitude to be sent; Current source circuit, be used for output amplitude with the saltus step of the logic level of digital voltage signal to be sent the electric current loop signal of saltus step; Said demultiplexer comprises: the second anti-phase ratio amplifying circuit is used for anti-phase and amplifies the ac voltage signal of supply power voltage and the analog voltage signal that output is received; The tertiary voltage comparison circuit is used to discern supply power voltage polarity and exports the digital voltage signal of receiving.
The invention solves analog signal, digital signal and than the transmission problem of large power, electrically source signal in the power supply two-line system bus system; Make from now on power supply two-line system bus system possess the ability of the big power load of digital communication, speech communication and driving simultaneously, the meaning that has particular importance for the autogamy telecommunication that call function, communication function need be provided simultaneously and control system.
Specify technical scheme of the present invention below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is a system configuration sketch map of the present invention.
Fig. 2 is a voltage source structural representation in the system of the present invention.
Fig. 3 is a node structure sketch map in the system of the present invention.
Fig. 4 is the second DC current source sketch map in the system of the present invention.
Fig. 5 is a Flow Control voltage source structural representation in the system of the present invention.
Voltage source circuit schematic diagram when Fig. 6 is a system transmissions analog signal of the present invention.
Node circuit schematic diagram when Fig. 7 is a system transmissions analog signal of the present invention.
One of voltage source circuit schematic diagram when Fig. 8 is a system transmissions digital signal of the present invention.
One of node circuit schematic diagram when Fig. 9 is a system transmissions digital signal of the present invention.
When Figure 10 is a system transmissions digital signal of the present invention two of the voltage source circuit schematic diagram.
When Figure 11 is a system transmissions digital signal of the present invention two of the node circuit schematic diagram.
One of voltage source circuit schematic diagram when Figure 12 is system of the present invention timesharing transmission of analogue signal and digital signal.
One of node circuit schematic diagram when Figure 13 is system of the present invention timesharing transmission of analogue signal and digital signal.
When Figure 14 is system of the present invention timesharing transmission of analogue signal and digital signal two of the voltage source circuit schematic diagram.
Figure 15 is in the system of the present invention when timesharing transmission of analogue signal and digital signal two of the node circuit schematic diagram.
Embodiment
Signal transmission system based on the power supply two-line system bus provided by the invention; As shown in Figure 1; Comprise two-wire system bus 2, be connected the some nodes 3 on this bus and to this bus the voltage source 1 of first supply current be provided, wherein bus A and bus B are respectively the two poles of the earth of two-wire system bus 2; Said voltage source 1 is as shown in Figure 2, comprising: direct voltage source 5 is used for to following Flow Control voltage source 4 power supplies; Flow Control voltage source 4 is used for the supply power voltage that provides the variation with first supply current to change to two-wire system bus 2; Wherein, two inputs of Flow Control voltage source 4 link to each other with two outputs of direct voltage source 5 respectively, and two outputs link to each other with A, B the two poles of the earth of two-wire system bus 2 respectively.
According to circuit theory; Derive easily: the supply power voltage that voltage source 1 provides to two-wire system bus 2 is exactly the output voltage of Flow Control voltage source 4; First supply current that provides is exactly the output current of Flow Control voltage source 4; The variation of the supply power voltage that voltage source 1 provides equals the variation of the output voltage of Flow Control voltage source 4, and the variation of first supply current that voltage source 1 provides equals the variation of Flow Control voltage source 4 output currents, and this is one of prerequisite of following signal transmission technology.
Said node 3 is as shown in Figure 3, comprising: voltage-controlled current source 6 is used for sending the electric current loop signals to two-wire system bus 2; First DC current source 7 is used for absorbing constant currents from two-wire system bus 2; Demultiplexer 8 is used for isolating analog voltage signal Ai to be received or/and digital voltage signal Di from the supply power voltage of two-wire system bus 2; Signal generator 9 is used for analog voltage signal Ao to be sent being provided or/and digital voltage signal Do to voltage-controlled current source 6; Power circuit 10 is used for from 7 power takings of first DC current source and to node 3 each circuit working power being provided; Signal processor 11 is used for the voltage signal that processing signals separator 8 is received; Polarity switching 12 is used to change the polarity of two-wire system bus 2 and the signalling channel of fixed polarity is provided to node 3 each circuit.Wherein, Two inputs of polarity switching 12 link to each other with A, B the two poles of the earth of two-wire system bus 2 respectively; Anodal P connects a signal input part of voltage-controlled current source 6, first direct voltage source 7, demultiplexer 8 respectively, and negative pole N is the common port of circuit in the connected node respectively; The control input end of voltage-controlled current source 6 connects the signal output part of signal generator 9; The current output terminal of first DC current source 7 connects power circuit 10; Two other signal input part of demultiplexer 8 connects A, B the two poles of the earth of two-wire system bus 2 respectively; The signal input part of signal processor 11 connects the signal output part of demultiplexer 8, and power circuit 10 is the relevant circuit supply of intranodal.
According to circuit theory, derive easily: the electric current that node 3 absorbs from two-wire system bus 2 constant current that to be exactly the electric current loop signal code that sends to two-wire system bus 2 of voltage-controlled current source 6, first DC current source 7 absorb from two-wire system bus 2 and three kinds of electric current sums of voltage signal input current of demultiplexer 8.When the input impedance of demultiplexer 8 is enough big; The signal input current can be ignored; The change in current that node 3 absorbs from two-wire system bus 2 just equals the change in current of the electric current loop signal that controlled voltage source 6 sends, this be following signal transmission technology prerequisite two.
In conjunction with Fig. 1, Fig. 2 and Fig. 3, according to circuit theory, derive easily: first supply current that voltage source 1 provides to two-wire system bus 2 is the electric current sum that node 3 absorbs from two-wire system bus 2; The variation of first supply current equals the variation of the electric current loop signal code of node 3 transmissions; The interchange equiva lent impedance of node 3 is high; And it is irrelevant from the size of current of total line absorption with node; Therefore; No matter the power of transmission is much, the power load of node has much, and the analog voltage signal of voltage source 1 output and digital voltage signal can transmission on two-wire system bus 2 almost losslessly.
Said Flow Control voltage source 4 is as shown in Figure 5, and comprising: current sampling circuit 13 is used for the first supply current conversion of signals is become the sampling voltage signal; Ac-coupled circuit 14 is used for isolating the sampling ac voltage signal from the sampling voltage signal; Control circuit 15 is used for from the extraction of sampling ac voltage signal and to following controlled voltage source output voltage control signal; Controlled voltage source 16 is used to produce the supply power voltage that changes with the control voltage signal.Wherein, The two ends of current sampling circuit 13 are serially connected between the negative pole of a utmost point B and direct voltage source 5 of two-wire system bus 2; Ac-coupled circuit 14 is serially connected between the input of output and control circuit 15 of current sampling circuit 13; The output of control circuit 15 connects the control input end of controlled voltage source 16, and the power input of controlled voltage source 16 connects the positive pole of direct voltage source 5, A, B the two poles of the earth of output termination two-wire system bus 2.Because of the different different circuits that adopt of transmission signals, the concrete form of circuit is seen the specific embodiment that each transmission signals is corresponding respectively for control circuit 15 and controlled voltage source 16.
Two-wire system bus 2 can be the two gangs of lead A and the B of mutually insulated in the prior art; In the voltage source 1, direct voltage source 5 can be the various devices that stable DC voltage can be provided in the prior art; In the node 3: voltage-controlled current source 6 can be various voltage-controlled constant-current source circuits in the prior art, and first DC current source 7 can be the various DC current sources that constant current can be provided in the prior art.Signal generator 9 can be can produce analog voltage signal Ao to be sent on request in the prior art or/and the various circuit of digital voltage signal Do; Signal processing circuit 11 can be can handle the analog voltage signal Ai that receives in the prior art on request or/and the various circuit of digital voltage signal Di; Power circuit 10 can be can be on request to the various circuit of each electric in the prior art, and polarity transformation circuits 12 can be a full-bridge circuit of the prior art.Wherein, because of the different different circuits that adopt of transmission signals, the concrete form of circuit is seen the specific embodiment that transmission signals is corresponding respectively for demultiplexer 8 and voltage-controlled current source 6.
Specific embodiment during transmission of analogue signal of the present invention is seen Fig. 6 and Fig. 7:
The circuit theory diagrams of voltage source 1 when Fig. 6 is transmission of analogue signal, wherein, current sampling circuit 13 is R1, ac-coupled circuit 14 is C1; Control circuit 15 is anti-phase ratio amplifying circuits that resistance R 2, R3, R4, R5 and operational amplifier U1 constitute; Controlled voltage source 16 is made up of resistance R 6, R7 and three-terminal voltage regulator U2.According to circuit theory, can derive: the amplitude that supply power voltage changes is directly proportional with the amplitude that first supply current changes, and the phase place that the phase place of variation and first supply current change is opposite.
The circuit theory diagrams of node 3 when Fig. 7 is transmission of analogue signal, wherein, polarity transformation circuits 12 is rectifier bridge D1; First DC current source 7 is made up of with three-terminal voltage regulator U11 resistance R 36; Power circuit 10 is made up of voltage stabilizing didoe DW1 and capacitor C 2; Demultiplexer 8 is anti-phase proportional amplifiers that capacitor C 6, resistance R 47, R48 and not gate U17 form; Voltage-controlled current source 6 is made up of resistance R 49, NPN triode T9 and operational amplifier U18; Signal generating circuit 9 comprises amplifier, microphone and first microcontroller that capacitor C 3, resistance R 37, R38 and not gate U12 form; Signal processor 11 comprises capacitor C 5, voice power amplifier, loud speaker and second microcontroller.According to circuit theory; Can derive: the amplitude that the electric current loop signal changes is directly proportional with the amplitude that analog voltage signal Ao to be sent changes; The amplitude that analog voltage signal Ai changes is directly proportional with the amplitude that supply power voltage changes, and the phase place that the phase place of variation and supply power voltage change is opposite.
The transmission course of analog signal is following: the variation of the electric current loop signal of analog voltage signal Ao → voltage-controlled current source 6 outputs that signal generator 9 outputs are to be sent is directly proportional with the amplitude that analog voltage signal AO changes with the amplitude that the supply power voltage that is varied to 1 output of direct ratio → voltage source of analog voltage signal Ao changes with the variation of first supply current that is varied to 1 output of direct ratio → voltage source of analog voltage signal Ao; The phase place that changes is opposite with the phase place that analog voltage signal Ao changes → amplitude that the analog voltage signal Ai of demultiplexer 8 outputs changes is directly proportional with the amplitude that supply power voltage changes, the phase place of the phase place of variation and supply terminals change in voltage on the contrary → variation of the analog voltage signal Ai that node 3 is received and the analog voltage signal Ao of node 3 transmissions be varied to direct ratio → end of transmission.
Specific embodiment 1 during transmission of digital signals of the present invention is seen Fig. 8 and Fig. 9:
One of circuit theory diagrams of voltage source 1 when Fig. 8 is transmission of analogue signal, wherein, current sampling circuit 13 is R1, ac-coupled circuit 14 is C1; Control circuit 15 is voltage comparator circuits that resistance R 8, R9, R10 and voltage comparator U3 form; Controlled voltage source 16 is made up of resistance R 6, R7 and three-terminal voltage regulator U2.According to circuit theory, can derive: when first supply current reduces or amplitude of variation during less than the predetermined value of the first supply current amplitude of variation, supply power voltage is the predetermined peak of supply power voltage; When first supply current increases and amplification during greater than the predetermined value of the first supply current amplitude of variation, supply power voltage is the supply power voltage predetermined lowest value; Wherein: the predetermined value of the first supply current amplitude of variation is confirmed by the output voltage of resistance R 1, R9, R10 and first direct voltage source 5; Predetermined peak of supply power voltage and supply power voltage predetermined lowest value are confirmed by the output voltage of resistance R 6, R7, R9, R10, U2, U3 and first direct voltage source 5.
One of circuit theory diagrams of node 3 when Fig. 9 is transmission of digital signals, wherein, polarity transformation circuits 12 is rectifier bridge D1; First DC current source 7 is made up of with three-terminal voltage regulator U11 resistance R 36; Power circuit 10 is made up of voltage stabilizing didoe DW1 and capacitor C 2; Demultiplexer 8 is voltage comparator circuits that resistance R 55, R56, R57, R58 and voltage comparator U21 form; Voltage-controlled current source 7 is made up of resistance R 54, NPN triode T10 and operational amplifier U20; Signal generating circuit 9 is first microcontrollers; Signal processor 11 is second microcontrollers.According to circuit theory; Can derive: the electric current loop signal changes and saltus step with the logic of digital voltage signal to be sent; And hopping amplitude is selected suitable value by logic level and resistance R 54 decisions, can guarantee the predetermined value of hopping amplitude greater than the first supply current amplitude of variation; The comparison circuit upset level of demultiplexer 8 is confirmed by resistance R 55, R56, R57, R58 and VCC; Select suitable value, logical AND the logic when supply power voltage be supply power voltage predetermined lowest value of the digital voltage signal Di that can guarantee its output when supply power voltage is the predetermined peak of supply power voltage is opposite.
The transmission course of digital signal is following: the electric current loop signal of digital voltage signal Do → voltage-controlled current source 6 outputs that signal generator 9 output is to be sent with the variation of the logic level of Do saltus step and hopping amplitude greater than the variation of the variation of first supply current of predetermined value → voltage source 1 output of the first supply current amplitude of variation and digital voltage signal Do synchronously and amplitude of variation be scheduled to saltus step between peak and the supply power voltage predetermined lowest value greater than the supply power voltage of predetermined value → voltage source 1 output of the first supply current amplitude of variation at supply power voltage; And the saltus step of the logic level of saltus step direction and digital voltage signal Do is in the opposite direction → digital voltage signal Di saltus step of demultiplexer 8 outputs with the saltus step of supply power voltage, and the saltus step direction in the opposite direction with the saltus step of supply power voltage → the digital voltage signal Di that node 3 is received and the digital voltage signal Do of node 3 transmissions is synchronous and logic equates → end of transmission.
Specific embodiment 2 during transmission of digital signals of the present invention is seen Figure 10 and Figure 11:
When Figure 10 is transmission of digital signals two of the circuit theory diagrams of voltage source 1, wherein, current sampling circuit 13 is R1, and ac-coupled circuit 14 is C1; Control circuit 15 is voltage comparator circuits that resistance R 8, R9, R10 and voltage comparator U3 form; Controlled voltage source 16 is H bridge circuits that contain driving that resistance R 26, R27, R28, R29, NPN triode T3, T5, PNP triode T4, T6 and inverter U8 form.According to circuit theory; Can derive: when first supply current reduces or amplitude of variation during less than the predetermined value of the first supply current amplitude of variation; The polarity of supply power voltage is the supply power voltage predetermined polarity; When first supply current increases and amplification during greater than the predetermined value of the first supply current amplitude of variation polarity inversion of supply power voltage; Wherein: the predetermined value of the first supply current amplitude of variation is confirmed by the output voltage of resistance R 1, R9, R10 and first direct voltage source 5.
When Figure 11 is transmission of digital signals two of the circuit theory diagrams of node 3, wherein, polarity transformation circuits 12 is rectifier bridge D1; First DC current source 7 is made up of with three-terminal voltage regulator U11 resistance R 36; Power circuit 10 is made up of voltage stabilizing didoe DW1 and capacitor C 2; Demultiplexer 8 is voltage comparator circuits that resistance R 50, R51, R52, R53 and voltage comparator U19 form; Voltage-controlled current source 6 is made up of resistance R 54, NPN triode T10 and operational amplifier U20; Signal generating circuit 9 is first microcontrollers; Signal processor 11 is second microcontrollers.According to circuit theory; Can derive: the electric current loop signal changes and saltus step with the logic of digital voltage signal to be sent; And hopping amplitude is selected suitable value by logic level and resistance R 54 decisions, can guarantee the predetermined value of hopping amplitude greater than the first supply current amplitude of variation; The logic of the logical AND of digital voltage signal Di when supply power voltage polarity is the supply power voltage predetermined polarity when supply power voltage polarity inversion of demultiplexer 8 outputs is opposite.
The transmission course of digital signal is following: saltus step and hopping amplitude be greater than the variation of the variation of first supply current of predetermined value → voltage source 1 output of the first supply current amplitude of variation and digital voltage signal Do synchronously and polarity saltus step with the saltus step of digital voltage signal Do of the supply power voltage exported greater than the predetermined value → voltage source 1 of the first supply current amplitude of variation of amplitude of variation with the variation of the logic level of Do for the electric current loop signal of digital voltage signal Do → voltage-controlled current source 6 outputs that signal generator 9 output is to be sent; And the saltus step of the logic level of saltus step direction and digital voltage signal Do is in the opposite direction → digital voltage signal Di saltus step of demultiplexer 8 outputs with the saltus step of supply power voltage polarity, and the saltus step direction in the opposite direction with the saltus step of polarity → the digital voltage signal Di that node 3 is received and the digital voltage signal Do of node 3 transmissions is synchronous and logic equates → end of transmission.Practical implementation 1 example when timesharing transmission of analogue signal of the present invention and digital signal is seen Figure 12 and Figure 13:
One of circuit theory diagrams of voltage source 1 when Figure 12 is timesharing transmission of analogue signal and digital signal, wherein, sample circuit 13 is R1, ac-coupled circuit 14 is C1; Control circuit 15 comprises: the first anti-phase ratio amplifying circuit that resistance R 11, R12, R13, R14 and operational amplifier U4 form; The second anti-phase ratio amplifying circuit that capacitor C 0, resistance R 21, R22, R23, R24, R25 and operational amplifier U7 form, and the ternary output window voltage comparator circuit formed of resistance R 15, R16, R17, R18, R19, R20, NPN triode T1, PNP triode T2 and voltage comparator U5, U6; Controlled voltage source 16 is made up of resistance R 6, R7 and three-terminal voltage regulator U2.According to circuit theory; Can derive: the amplitude that changes when first supply current is during less than the predetermined value of the first supply current amplitude of variation; Supply power voltage variation and amplitude of variation in the supply power voltage preset range are directly proportional with the amplitude that first supply current changes, and the phase place of variation is opposite with the phase place of first supply current variation; When first supply current reduces and amount of decrease during greater than the predetermined value of the first supply current amplitude of variation, supply power voltage is the predetermined peak of supply power voltage; When first supply current increases and amplification during greater than the predetermined value of the first supply current amplitude of variation, supply power voltage is the supply power voltage predetermined lowest value.Wherein, The predetermined value of the first supply current amplitude of variation is by the output voltage decision of resistance R 1, R11, R12, R13, R14, R15, R16, R17, R18 and direct voltage source 5; Predetermined peak of supply power voltage and supply power voltage predetermined lowest value are by the output voltage decision of R6, R7, R23, R24, U2, U7 and direct voltage source 5; The preset range of supply power voltage is determined by above-mentioned all parameters jointly; Suitably select their value, can guarantee that the lower limit of piezoelectric voltage preset range is higher than the supply power voltage predetermined lowest value.
One of circuit theory diagrams of node 3 when Figure 13 is timesharing transmission of analogue signal and digital signal, wherein, polarity transformation circuits 12 is rectifier bridge D1; DC current source 7 is made up of with three-terminal voltage regulator U11 resistance R 36; Power circuit 10 is made up of voltage stabilizing didoe DW1 and capacitor C 2; Demultiplexer 8 comprises: the anti-phase proportional amplifier that capacitor C 4, resistance R 45, R46 and not gate U16 form, and the voltage comparator circuit of resistance R 41, R42, R43, R44 and voltage comparator U15 composition; Voltage-controlled current source 6 comprises: second voltage-controlled current source that first voltage-controlled current source that resistance R 39, NPN triode T7 and operational amplifier U13 form and resistance R 40, T8, U14 form; Signal generating circuit 9 is made up of capacitor C 3, resistance R 37, R38, not gate U12, microphone and first microcontroller; Signal processor 11 is made up of capacitor C 5, voice power amplifier, loud speaker and second microcontroller.According to circuit theory; Can derive: when sending analog signal; The amplitude of variation of electric current loop signal is directly proportional with the amplitude of variation of analog voltage signal Ao to be sent, and the excursion of electric current loop signal is suitably selected the value of R39 and the excursion of control analog voltage signal Ao by excursion and resistance R 39 decisions of analog voltage signal Ao; Can guarantee the predetermined value of the amplitude of variation of electric current loop signal sum, in order to avoid cause the variation of supply power voltage polarity less than the first supply current amplitude of variation; When sending digital signal; The electric current loop signal changes and saltus step with the logic of digital voltage signal Do to be sent; The excursion of electric current loop signal is by logic level and resistance R 40 decisions of digital signal Do; Suitably select the value of R40, can guarantee the predetermined value of the hopping amplitude of electric current loop signal greater than the first supply current amplitude of variation.When transmission of analogue signal, the amplitude of variation of the analog voltage signal Ai of demultiplexer 8 outputs is directly proportional with the amplitude of variation of supply power voltage, and the phase place that the phase place of variation and supply power voltage change is opposite; When transmission of digital signals; Suitably select the value of R41, R42, R43 and R44; The logical AND of digital voltage signal Di when supply power voltage changes in the supply power voltage preset range that can make demultiplexer 8 output is that the logic of the predetermined peak of supply power voltage is equal at supply power voltage, but opposite with logic when supply power voltage is the supply power voltage predetermined lowest value.
The timesharing transmission course of analog signal and digital signal is following: during transmission of analogue signal; The amplitude of variation of electric current loop signal sum is less than the predetermined value of the first supply current amplitude of variation; Supply power voltage changes at the supply power voltage preset range; It is constant that the digital signal output end of demultiplexer 8 is kept fixed logic level; The variation of the electric current loop signal of analog voltage signal Ao → voltage-controlled current source 6 outputs that signal generator 9 outputs are to be sent is directly proportional with the amplitude that analog voltage signal Ao changes with the amplitude that the supply power voltage that is varied to 1 output of direct ratio → voltage source of analog voltage signal Ao changes with the variation of first supply current that is varied to 1 output of direct ratio → voltage source of analog voltage signal Ao; The phase place that changes is opposite with the phase place that analog voltage signal Ao changes → amplitude that the voltage signal Ai of demultiplexer 8 outputs changes is directly proportional with the amplitude that supply power voltage changes, the phase place of the phase place of variation and supply terminals change in voltage on the contrary → variation of the analog voltage signal Ai that node 3 is received and the analog voltage signal Ao of node 3 transmissions be varied to direct ratio → end of transmission; During transmission of digital signals; The electric current loop signal of digital voltage signal Do → voltage-controlled current source 6 outputs that signal generator 9 output is to be sent with the variation of the logic level of Do saltus step and hopping amplitude greater than the variation of the variation of first supply current of predetermined value → voltage source 1 output of the first supply current amplitude of variation and digital voltage signal Do synchronously and amplitude of variation be scheduled to saltus step between peak and the supply power voltage predetermined lowest value greater than the supply power voltage of predetermined value → voltage source 1 output of the first supply current amplitude of variation at supply power voltage; And the logic of saltus step direction and digital voltage signal Do changes in the opposite direction → voltage signal Di saltus step of demultiplexer 8 outputs with the saltus step of supply power voltage, and the saltus step direction in the opposite direction with the saltus step of supply power voltage → the digital voltage signal Di that node 3 is received and the digital voltage signal Do of node 3 transmissions is synchronous and logic equates → end of transmission.
Practical implementation 2 examples when timesharing transmission of analogue signal of the present invention and digital signal are seen Figure 14 and Figure 15:
When Figure 14 is timesharing transmission of analogue signal and digital signal two of the circuit theory diagrams of voltage source 1, wherein, sample circuit 13 is R1, and ac-coupled circuit 14 is C1; Control circuit 15 comprises: the anti-phase ratio amplifying circuit of resistance R 30, R31, R32, R33 and operational amplifier U9 group, and the voltage comparator circuit of resistance R 8, R9, R10 and voltage comparator U3 composition; Controlled voltage source 16 comprises the voltage stabilizing circuit that resistance R 34, R35 and three-terminal voltage regulator U10 form, and the H bridge circuit that contains driving of resistance R 26, R27, R28, R29, NPN triode T3, T5, PNP triode T4, T6 and inverter U8 composition.According to circuit theory; Can derive: the amplitude that changes when first supply current is during less than the predetermined value of the first supply current amplitude of variation; The polarity of supply power voltage is the predetermined polarity of supply power voltage; The amplitude that supply power voltage changes is directly proportional with the amplitude that first supply current changes, and the phase place that the phase place of variation and first supply current change is opposite; When first supply current reduces and amount of decrease during greater than the predetermined value of the first supply current amplitude of variation, the polarity of supply power voltage is the supply power voltage predetermined polarity; When first supply current increases and amplification during greater than the predetermined value of the first supply current amplitude of variation polarity inversion of supply power voltage.Wherein, the predetermined value of the first supply current amplitude of variation is confirmed by the output voltage of resistance R 1, R9, R10 and first direct voltage source 5.
When Figure 15 is timesharing transmission of analogue signal and digital signal two of the circuit theory diagrams of node 3, wherein, polarity transformation circuits 12 is rectifier bridge D1; DC current source 7 is made up of with three-terminal voltage regulator U11 resistance R 36; Power circuit 10 is made up of voltage stabilizing didoe DW1 and capacitor C 2; Demultiplexer 8 comprises: the anti-phase proportional amplifier that capacitor C 4, resistance R 45, R46 and not gate U16 form, and the voltage comparator circuit of resistance R 41, R42, R43, R44 and voltage comparator U15 composition; Voltage-controlled current source 6 comprises: first voltage-controlled current source that resistance R 39, NPN triode T7 and operational amplifier U13 form, and second voltage-controlled current source formed of resistance R 40, T8, U14; Signal generating circuit 9 is made up of capacitor C 3, resistance R 37, R38, not gate U12, microphone and first microcontroller; Signal processor 11 is made up of capacitor C 5, voice power amplifier, loud speaker and second microcontroller.According to circuit theory; Can derive: when sending analog signal; The amplitude of variation of electric current loop signal is directly proportional with the amplitude of variation of analog voltage signal Ao to be sent, and the excursion of electric current loop signal is suitably selected the value of R39 and the excursion of control analog voltage signal Ao by excursion and resistance R 39 decisions of analog voltage signal Ao; Can guarantee the predetermined value of the amplitude of variation of electric current loop signal sum, in order to avoid cause the variation of supply power voltage polarity less than the first supply current amplitude of variation; When sending digital signal; The saltus step of electric current loop signal with the variation of the logic level of digital voltage signal Do to be sent; The excursion of electric current loop signal is by logic level and resistance R 40 decisions of digital signal Do; Suitably select the value of R40, can guarantee the predetermined value of the hopping amplitude of electric current loop signal greater than the first supply current amplitude of variation.When transmission of analogue signal, the amplitude of variation of the analog voltage signal Ai of demultiplexer 8 outputs is directly proportional with the amplitude of variation of supply power voltage, and the phase place that the phase place of variation and supply power voltage change is opposite; When transmission of digital signals, the logic of the logical AND of digital voltage signal when supply power voltage polarity is the supply power voltage predetermined polarity when supply power voltage polarity inversion of demultiplexer 8 outputs is opposite.
The timesharing transmission course of analog signal and digital signal is following: during transmission of analogue signal; The amplitude of variation of electric current loop signal sum is less than the predetermined value of the first supply current amplitude of variation; Supply power voltage polarity remains unchanged; It is constant that the digital signal output end of demultiplexer 8 is kept fixed logic level; The variation of the electric current loop signal of analog voltage signal Ao → voltage-controlled current source 6 outputs that signal generator 9 outputs are to be sent is directly proportional with the amplitude that analog voltage signal AO changes with the amplitude that the supply power voltage that is varied to 1 output of direct ratio → voltage source of analog voltage signal Ao changes with the variation of first supply current that is varied to 1 output of direct ratio → voltage source of analog voltage signal Ao; The phase place that changes is opposite with the phase place that analog voltage signal Ao changes → amplitude that the voltage signal Ai of demultiplexer 8 outputs changes is directly proportional with the amplitude that supply power voltage changes, the phase place of the phase place of variation and supply terminals change in voltage on the contrary → variation of the analog voltage signal Ai that node 3 is received and the analog voltage signal Ao of node 3 transmissions be varied to direct ratio → end of transmission; During transmission of digital signals; Saltus step and hopping amplitude be greater than the variation of the variation of first supply current of predetermined value → voltage source 1 output of the first supply current amplitude of variation and digital voltage signal Do synchronously and polarity saltus step with the saltus step of the logic level of digital voltage signal Do of the supply power voltage exported greater than the predetermined value → voltage source 1 of the first supply current amplitude of variation of amplitude of variation with the variation of the logic level of Do for the electric current loop signal of digital voltage signal Do → voltage-controlled current source 6 outputs that signal generator 9 output is to be sent; And voltage signal Di saltus step of the changing in the opposite direction of the logic level of saltus step direction and digital voltage signal Do → demultiplexer 8 outputs with the saltus step of supply power voltage polarity, and the saltus step direction in the opposite direction with the saltus step of polarity → the digital voltage signal Di that node 3 is received and the digital voltage signal Do of node 3 transmissions is synchronous and logic equates → end of transmission.
As shown in Figure 4, the present invention is based on the signal transmission system of power supply two-line system bus, also comprise at least one provides second DC current source 17 from second supply current to two-wire system bus 2.
Second DC current source 17 can be the various DC current sources that constant current can be provided in the prior art.
At this moment, first supply current that provides to two-wire system bus 2 of voltage source 1 equals node 3 and deducts the second supply current sum that second DC current source 17 provides to the two-wire system bus from the electric current sum that two-wire system bus 2 absorbs.
The size of the second supply current sum that suitable selection second DC current source 17 provides; To guarantee that first supply current is greater than the amplitude of node 3 to the electric current loop signal code sum variation of two-wire system bus 2 transmissions; Then do not consume the AC signal energy on the two-wire system bus 2 because the AC impedance of second DC current source is high; Thereby: when transmission of analogue signal, have the signal transmission characteristics identical with the specific embodiment of transmission of analogue signal; When transmission of digital signals, have the signal transmission characteristics identical, but do not have the identical signal transmission characteristics of specific embodiment 1 of transmission of digital signals with the specific embodiment of transmission of digital signals 2; When timesharing transmission of analogue signal and digital signal; Have the signal transmission characteristics identical, but do not have the identical signal transmission characteristics of specific embodiment 1 of timesharing transmission of analogue signal and digital signal with the specific embodiment of timesharing transmission of analogue signal and digital signal 2.

Claims (15)

1. method for transmitting signals based on the power supply two-line system bus; It is characterized in that one by the two-wire system bus, be connected the some nodes on this bus and transmission of analogue signal in the system that the voltage source of first supply current constitutes be provided or/and digital signal to this bus, supply power voltage that said voltage source provides to the two-wire system bus is changed with the variation of first supply current; Make said node send the electric current loop signal, receive voltage signal from the two-wire system bus, from the total line absorption constant current of two-wire system to the two-wire system bus.
2. the method for transmitting signals based on the power supply two-line system bus according to claim 1; It is characterized in that said system also comprises provides some second DC current sources from second supply current to the two-wire system bus, make the said second supply current sum less than the constant current sum of said node from the total line absorption of two-wire system.
3. the method for transmitting signals based on the power supply two-line system bus according to claim 1 and 2 is characterized in that the method for said transmission of analogue signal is:
Make said supply power voltage with the rule that the variation of first supply current changes be: the amplitude that supply power voltage changes is directly proportional with the amplitude that first supply current changes, and the phase place of the phase place of variation and the variation of first supply current is opposite;
The amplitude that the electric current loop signal that said node is sent to the two-wire system bus changes is directly proportional with the amplitude that analog voltage signal to be sent changes;
Making said node is analog voltage signal from the voltage signal that the two-wire system bus receives, and the amplitude that this analog voltage signal changes is directly proportional with the amplitude that supply power voltage changes, and the phase place that the phase place of variation and supply power voltage change is opposite.
4. the method for transmitting signals based on the power supply two-line system bus according to claim 1 and 2 is characterized in that the method for said transmission of digital signals is:
Make said supply power voltage with the rule that the variation of first supply current changes be: when first supply current reduces or amplitude of variation during less than the predetermined value of the first supply current amplitude of variation, supply power voltage is the predetermined peak of supply power voltage; When first supply current increases and amplification during greater than the predetermined value of the first supply current amplitude of variation, supply power voltage is the supply power voltage predetermined lowest value;
Electric current loop signal that said node sends to the two-wire system bus is changed with the logic of digital voltage signal to be sent and saltus step and hopping amplitude greater than the predetermined value of the first supply current amplitude of variation;
Making said node is digital voltage signal from the voltage signal that the two-wire system bus receives, and logical AND the logic when supply power voltage be supply power voltage predetermined lowest value of this digital voltage signal when supply power voltage is the predetermined peak of supply power voltage is opposite.
5. the method for transmitting signals based on the power supply two-line system bus according to claim 1 is characterized in that the method for said transmission of digital signals is:
Make said supply power voltage be: when first supply current reduces or amplitude of variation during less than the predetermined value of the first supply current amplitude of variation with the rule that the variation of first supply current changes; The polarity of supply power voltage is the supply power voltage predetermined polarity; When first supply current increases and amplification during greater than the predetermined value of the first supply current amplitude of variation polarity inversion of supply power voltage;
Electric current loop signal that said node sends to the two-wire system bus is changed with the logic of digital voltage signal to be sent and saltus step and hopping amplitude greater than the predetermined value of the first supply current amplitude of variation;
Making said node is digital voltage signal from the voltage signal that the two-wire system bus receives, and the logic of the logical AND of this digital voltage signal when supply power voltage polarity is the supply power voltage predetermined polarity when supply power voltage polarity inversion is opposite.
6. the method for transmitting signals based on the power supply two-line system bus according to claim 1 and 2, the method that it is characterized in that said transmission of analogue signal and digital signal are the timesharing transmission, and the method for said timesharing transmission does :
Make said supply power voltage with the rule that the variation of first supply current changes be: the amplitude that changes when first supply current is during less than the predetermined value of the first supply current amplitude of variation, and supply power voltage variation and amplitude of variation in the supply power voltage preset range are directly proportional with the amplitude of first supply current variation; When first supply current reduces and amount of decrease during greater than the predetermined value of the first supply current amplitude of variation, supply power voltage is the predetermined peak of supply power voltage; When first supply current increases and amplification during greater than the predetermined value of the first supply current amplitude of variation, supply power voltage is the supply power voltage predetermined lowest value; The lower limit of said supply power voltage preset range is higher than the supply power voltage predetermined lowest value;
The electric current loop signal that said node is sent to the two-wire system bus satisfies: when sending analog signal; The amplitude of variation of electric current loop signal is directly proportional with the amplitude of variation of analog voltage signal to be sent, and the amplitude of variation of electric current loop signal sum is less than the predetermined value of the first supply current amplitude of variation; When sending digital signal, the electric current loop signal change with the logic of digital voltage signal to be sent and saltus step and hopping amplitude greater than the predetermined value of the first supply current amplitude of variation;
Said node is satisfied from the voltage signal that the two-wire system bus receives: when transmission of analogue signal, the voltage signal of reception is an analog voltage signal, and the amplitude that this analog voltage signal changes is directly proportional with the amplitude that supply power voltage changes; When transmission of digital signals, the voltage signal of reception is a digital voltage signal,
The logical AND of this digital voltage signal when supply power voltage changes in the supply power voltage preset range is that the logic of the predetermined peak of supply power voltage equates at supply power voltage, but opposite with logic when supply power voltage is the supply power voltage predetermined lowest value.
7. the method for transmitting signals based on the power supply two-line system bus according to claim 1, the method that it is characterized in that said transmission of analogue signal and digital signal are the timesharing transmission, and the method for said timesharing transmission does :
Make said supply power voltage with the rule that the variation of first supply current changes be: the amplitude that changes when first supply current is during less than the predetermined value of the first supply current amplitude of variation; The polarity of supply power voltage is the predetermined polarity of supply power voltage; The amplitude that supply power voltage changes is directly proportional with the amplitude that first supply current changes, and the phase place that the phase place of variation and first supply current change is opposite; When first supply current reduces and amount of decrease during greater than the predetermined value of the first supply current amplitude of variation, the polarity of supply power voltage is the supply power voltage predetermined polarity; When first supply current increases and amplification during greater than the predetermined value of the first supply current amplitude of variation polarity inversion of supply power voltage;
The electric current loop signal that said node is sent to the two-wire system bus satisfies: when sending analog signal; The amplitude of variation of electric current loop signal is directly proportional with the amplitude of variation of analog voltage signal to be sent, and the amplitude of variation of electric current loop signal sum is less than the predetermined value of the first supply current amplitude of variation; When sending digital signal, the electric current loop signal change with the logic of digital voltage signal to be sent and saltus step and hopping amplitude greater than the predetermined value of the first supply current amplitude of variation;
Said node is satisfied from the voltage signal that the two-wire system bus receives: when transmission of analogue signal, the voltage signal of reception is an analog voltage signal, and the amplitude of variation of this analog voltage signal is directly proportional with the amplitude of variation of supply power voltage; When transmission of digital signals, the voltage signal of reception is a digital voltage signal, and the logic of the logical AND of this digital voltage signal when supply power voltage polarity is the supply power voltage predetermined polarity when supply power voltage polarity inversion is opposite.
8. signal transmission system based on the power supply two-line system bus is characterized in that comprising the two-wire system bus, is connected the some nodes on this bus and the voltage source of first supply current is provided to this bus; Said voltage source comprises: direct voltage source is used for to following Flow Control voltage fed; The Flow Control voltage source is used for the supply power voltage that provides the variation with first supply current to change to the two-wire system bus; Said node comprises: voltage-controlled current source is used for sending the electric current loop signal to the two-wire system bus; First DC current source is used for from the total line absorption constant current of two-wire system; Demultiplexer is used for isolating voltage signal to be received from the supply power voltage of two-wire system bus; Signal generator is used for to voltage-controlled current source voltage signal to be sent being provided; Power circuit is used for from the first DC current source power taking and to each circuit of node working power being provided; Signal processor is used for the voltage signal that the processing signals separator is received; Polarity switching is used to change the two-wire system polarity of bus and the signalling channel of fixed polarity is provided to each circuit of node.
9. the signal transmission system based on the power supply two-line system bus according to claim 8 is characterized in that said Flow Control voltage source comprises: current sampling circuit is used for the first supply current conversion of signals is become the sampling voltage signal; Ac-coupled circuit is used for isolating the sampling ac voltage signal from the sampling voltage signal; Control circuit is used for from the extraction of sampling ac voltage signal and to following controlled voltage source output control voltage signal; Controlled voltage source is used to produce the supply power voltage that changes with the control voltage signal.
10. the signal transmission system based on the power supply two-line system bus according to claim 9; When it is characterized in that transmission of analogue signal; Said control circuit comprises: the first anti-phase ratio amplifying circuit is used for amplifying the sampling ac voltage signal and exporting the aanalogvoltage control signal; Said controlled voltage source comprises: adjustable linear voltage-stabilizing circuit, the supply power voltage that is used to provide the variation with the aanalogvoltage control signal to change; Said voltage-controlled current source comprises: the linear current source circuit is used for the electric current loop signal that output amplitude is directly proportional with analog voltage signal amplitude to be sent; Said demultiplexer comprises: the second anti-phase ratio amplifying circuit is used for anti-phase and amplifies the ac voltage signal of supply power voltage and the analog voltage signal that output is received.
11. the signal transmission system based on the power supply two-line system bus according to claim 9; When it is characterized in that transmission of digital signals; Said control circuit comprises: first voltage comparator circuit, and ac voltage signal amplitude and export the digital voltage control signal is used for relatively taking a sample; Said controlled voltage source comprises: adjustable voltage stabilizing circuit, the supply power voltage that is used to provide the height with digital voltage control signal level to change; Said voltage-controlled current source comprises: current source circuit, be used for output amplitude with the saltus step of the logic level of digital voltage signal to be sent the electric current loop signal of saltus step; Said demultiplexer comprises: second voltage comparator circuit is used for the digital voltage signal that comparison supply power voltage amplitude of variation and output are received.
12. the signal transmission system based on the power supply two-line system bus according to claim 9; When it is characterized in that transmission of digital signals; Said control circuit comprises: first voltage comparator circuit, and ac voltage signal amplitude and export the digital voltage control signal is used for relatively taking a sample; Said controlled voltage source comprises: contain the H bridge circuit of driving, be used for changing the polarity that changes supply power voltage according to the height of digital voltage control signal level; Said voltage-controlled current source comprises: current source circuit, be used for output amplitude with the saltus step of the logic level of digital voltage signal to be sent the electric current loop signal of saltus step; Said demultiplexer comprises: the tertiary voltage comparison circuit is used to discern supply power voltage polarity and exports the digital voltage signal of receiving.
13. the signal transmission system based on the power supply two-line system bus according to claim 9; When it is characterized in that timesharing transmission of analogue signal and digital signal; Said control circuit comprises: the first anti-phase ratio amplifying circuit; Be used to amplify the output signal of sampling ac voltage signal and following ternary output window voltage comparator circuit, export aanalogvoltage control signal and digital voltage control signal simultaneously; The 3rd anti-phase ratio amplifying circuit is used for amplifying the sampling ac voltage signal and to following ternary output window voltage comparator circuit the comparison input voltage signal is provided; Ternary output window voltage comparator circuit is used for the comparative voltage excursion and exports high level, low level and three kinds of signals of high resistant according to the result to the above-mentioned first anti-phase ratio amplifying circuit; Said controlled voltage source comprises: adjustable linear voltage-stabilizing circuit, the supply power voltage that is used to provide the variation with the aanalogvoltage control signal to change; The H bridge circuit that contains driving is used for changing the polarity that changes supply power voltage according to the height of digital voltage control signal level; Said voltage-controlled current source comprises: the linear current source circuit is used for the electric current loop signal that output amplitude is directly proportional with analog voltage signal amplitude to be sent; Current source circuit, be used for output amplitude with the saltus step of the logic level of digital voltage signal to be sent the electric current loop signal of saltus step; Said demultiplexer comprises: the second anti-phase ratio amplifying circuit is used for anti-phase and amplifies the ac voltage signal of supply power voltage and the analog voltage signal that output is received; Second voltage comparator circuit is used for the digital voltage signal that comparison supply power voltage amplitude of variation and output are received.
14. the signal transmission system based on the power supply two-line system bus according to claim 9; When it is characterized in that timesharing transmission of analogue signal and digital signal; Said control circuit comprises: the first anti-phase ratio amplifying circuit is used for amplifying the sampling ac voltage signal and exporting the aanalogvoltage control signal; First voltage comparator circuit, ac voltage signal amplitude and export the digital voltage control signal is used for relatively taking a sample; Said controlled voltage source comprises: adjustable linear voltage-stabilizing circuit, the supply power voltage that is used to provide the variation with the aanalogvoltage control signal to change; The H bridge circuit that contains driving is used for changing the polarity that changes supply power voltage according to the height of digital voltage control signal level; Said voltage-controlled current source comprises: the linear current source circuit is used for the electric current loop signal that output amplitude is directly proportional with analog voltage signal amplitude to be sent; Current source circuit, be used for output amplitude with the saltus step of the logic level of digital voltage signal to be sent the electric current loop signal of saltus step; Said demultiplexer comprises: the second anti-phase ratio amplifying circuit is used for anti-phase and amplifies the ac voltage signal of supply power voltage and the analog voltage signal that output is received; The tertiary voltage comparison circuit is used to discern supply power voltage polarity and exports the digital voltage signal of receiving.
15. according to Claim 8 or 9 or 10 or 11 or 13 described signal transmission systems based on the power supply two-line system bus, the diverse location that it is characterized in that also being included on the two-wire system bus is provided with several provide second DC current source from second operating current to the two-wire system bus.
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CN111541443A (en) * 2020-04-14 2020-08-14 北京旋极信息技术股份有限公司 Signal transmission circuit
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CN111209238B (en) * 2020-01-17 2022-05-03 济南金奥太信息有限公司 Two bus communication interface circuit based on power supply and communication time sharing multiplex
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CN111541443B (en) * 2020-04-14 2023-08-22 北京旋极信息技术股份有限公司 signal transmission circuit
CN112333068A (en) * 2020-10-30 2021-02-05 天基电气（深圳）有限公司 Power supply communication bus system, power supply communication method and electronic equipment
CN112333068B (en) * 2020-10-30 2021-11-19 天基电气（深圳）有限公司 Power supply communication bus system, power supply communication method and electronic equipment

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