CN212518970U

CN212518970U - Non-polarity direct current carrier communication circuit

Info

Publication number: CN212518970U
Application number: CN202021343667.9U
Authority: CN
Inventors: 徐向红
Original assignee: Pengchen Technology Suzhou Co ltd
Current assignee: Pengchen Technology Suzhou Co ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2021-02-09
Anticipated expiration: 2030-07-10

Abstract

The utility model discloses a nonpolarity direct current carrier communication circuit, it includes main website circuit and a plurality of sub station circuit of being connected with main website circuit electricity, and main website circuit includes main website direct current circuit and the parallelly connected main website carrier circuit of with main website direct current circuit, and main website direct current circuit includes main website rectifier bridge circuit, and sub station circuit includes sub station direct current circuit and the parallelly connected sub station carrier circuit of with sub station direct current circuit, and sub station direct current circuit includes sub station rectifier bridge circuit. The utility model discloses a nonpolarity direct current carrier communication circuit can realize two-way rectification, makes the transmission line really accomplish nonpolarity, ensures the reliability of communication and equipment.

Description

Non-polarity direct current carrier communication circuit

Technical Field

The utility model relates to a communication control field, in particular to nonpolarity direct current carrier communication circuit.

Background

In the existing direct current carrier communication technology, a pair of wires is usually adopted to realize power supply and communication functions at the same time, which has the problem of reverse connection, and if the wires are reversely connected, the situation that the equipment cannot work normally or is damaged can be caused, so that the direct current carrier communication technology is inconvenient for daily use.

At present, a rectifier bridge technology is introduced into carrier communication, such as chinese patents: CN 207475583U-a dc carrier communication interface circuit capable of implementing power transmission; chinese patent: CN 205541403U-a line controller power carrier communication structure; chinese patent: CN202068415U, a non-polar connection power carrier communication circuit, all adopt the slave station rectification mode to implement non-polar connection. However, once the system has a plurality of master stations, the system will interfere with each other, which affects the stability of communication and the flexibility of networking; or when the slave station fails, the master station may be damaged.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the above-mentioned defect among the prior art, provide a nonpolarity direct current carrier communication circuit, can realize two-way rectification, make the transmission line really accomplish nonpolarity, ensure the reliability of communication and equipment.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:

a non-polar direct current carrier communication circuit comprises a main station circuit and a plurality of sub-station circuits electrically connected with the main station circuit, wherein the main station circuit comprises a main station direct current circuit and a main station carrier circuit connected with the main station direct current circuit in parallel, the main station direct current circuit comprises a main station rectifier bridge circuit, the sub-station circuits comprise sub-station direct current circuits and sub-station carrier circuits connected with the sub-station direct current circuits in parallel, and the sub-station direct current circuits comprise sub-station rectifier bridge circuits;

the unipolar modulated carrier signal output by the main station direct-current circuit is rectified by the main station rectifier bridge circuit to form a nonpolar modulated carrier signal and is transmitted to the substation circuit, and the substation rectifier bridge circuit receives the nonpolar modulated carrier signal and rectifies the nonpolar modulated carrier signal to form the unipolar modulated carrier signal;

the unipolar modulated carrier signal output by the substation direct-current circuit is rectified by the substation rectifier bridge circuit to form a nonpolar modulated carrier signal and is transmitted to the master station circuit, and the master station rectifier bridge circuit receives the nonpolar modulated carrier signal and rectifies the nonpolar modulated carrier signal to form the unipolar modulated carrier signal.

Furthermore, the utility model discloses still include following subsidiary technical scheme:

the main station rectifier bridge circuit includes a first dual diode D1 and a second dual diode D2 connected in parallel with the first dual diode D1.

The main station direct current circuit further comprises a main station direct current power supply module and a bus driving circuit connected with the main station direct current power supply module in series, and the main station rectifier bridge circuit is connected with the bus driving circuit in series.

The bus driving circuit comprises a first power field-effect transistor Q1, the source electrode of the first power field-effect transistor Q1 is connected with the anode of the main station direct current power supply module, the drain electrode of the first power field-effect transistor Q1 is connected with the anode connection point of the first double diode D1 and the second double diode D2, and the cathode connection point of the first double diode D1 and the second double diode D2 is grounded.

The master station direct-current circuit further comprises an electromagnetic compatibility protection circuit, the electromagnetic compatibility protection circuit is connected in parallel to a common connection point of the first double diode D1 and a common connection point of the second double diode D2, and the electromagnetic compatibility protection circuit is connected with the substation circuit through a transmission bus.

The main station direct current circuit further comprises a voltage stabilizing protection circuit connected with the main station direct current power supply module in parallel.

The substation rectifier bridge circuit comprises a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6, and the full-wave rectifier bridge is formed by the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6.

The substation direct-current circuit further comprises a bus protection circuit connected with the master station circuit, one end of the bus protection circuit is connected with a connection point where the anode of the third diode D3 is connected with the cathode of the fourth diode D4, and the other end of the bus protection circuit is connected with a connection point where the anode of the fifth diode D5 is connected with the cathode of the sixth diode D6.

The bus protection circuit comprises a recoverable fuse F1 and two second transient diodes TVS2 which are connected in series in a reverse direction, one end of the recoverable fuse F1 is connected with one output end of the main station circuit, the other end of the recoverable fuse F1 is connected with one end of the two second transient diodes TVS2 which are connected in series in a reverse direction, the other end of the two second transient diodes TVS2 which are connected in series in a reverse direction is connected with the other output end of the main station circuit, the other end of the recoverable fuse F1 is connected with a connection point of a third diode D3 and a fourth diode D4, and the other end of the two second transient diodes TVS2 which are connected in series in a reverse direction is connected with a connection point of a positive pole of the fifth diode D5 and a negative pole of the sixth diode D6.

The substation direct-current circuit further comprises a substation power extraction circuit, a connection point of a negative electrode of the fifth diode D5 and a negative electrode of the third diode D3 is connected with the substation power extraction circuit, and a connection point of an anode of the sixth diode D6 and an anode of the fourth diode D4 is grounded.

Compared with the prior art, the utility model discloses the advantage lies in:

the method comprises the steps that a main station rectifier bridge circuit is arranged on a main station circuit, a sub-station rectifier bridge circuit is arranged on a sub-station circuit, unipolar modulated carrier signals output by the main station direct current circuit are rectified by the main station rectifier bridge circuit to form nonpolar modulated carrier signals, and the nonpolar modulated carrier signals are transmitted to the sub-station circuit; the unipolar modulated carrier signal output by the substation direct-current circuit is rectified by the substation rectifier bridge circuit to form a nonpolar modulated carrier signal and is transmitted to the main station circuit, and the main station rectifier bridge circuit receives the nonpolar modulated carrier signal and rectifies the nonpolar modulated carrier signal to form the unipolar modulated carrier signal, so that bidirectional rectification is realized, the transmission line is truly nonpolar, and the reliability of communication and equipment is guaranteed.

Drawings

Fig. 1 is a schematic diagram of a non-polar dc carrier communication circuit according to the present invention.

Fig. 2 is a schematic diagram of the circuit of the central station of the present invention.

Fig. 3 is a schematic diagram of the middle station and substation circuit of the present invention.

Detailed Description

The following non-limiting detailed description of the present invention is provided in connection with the preferred embodiments and accompanying drawings.

As shown in fig. 1, the non-polar dc carrier communication circuit according to a preferred embodiment of the present invention includes a master station circuit 1 and a plurality of slave station circuits 2 electrically connected to the master station circuit 1.

As shown in fig. 2, the master station circuit 1 includes a master station dc circuit 11 and a master station carrier circuit 12 connected in parallel to the master station dc circuit 11. The main station dc circuit 11 includes a main station dc power supply module 111, a regulated protection circuit 112 connected in parallel with the main station dc power supply module 111, a bus driving circuit 113 connected in series with the regulated protection circuit 112, a main station rectifier bridge circuit 114 connected in series with the bus driving circuit 113, and an electromagnetic compatibility (EMC) protection circuit 115 connected in parallel with the main station rectifier bridge circuit 114.

And the main station direct current power supply module 111 is used for supplying 12-48V voltage.

The voltage stabilizing protection circuit 112 comprises a first capacitor C1, the positive electrode of the first capacitor C1 is connected with the positive electrode of the main station dc power supply module 111, and the negative electrode of the first capacitor C1 is connected with the negative electrode of the main station dc power supply module 111 and grounded. The first capacitor C1 preferably has a value in the range of 470uf to 2000uf, and is used for stabilizing the supply voltage and preventing the bus voltage from dropping under the condition of instantaneous large current output.

The bus driving circuit 113 comprises a first power field-effect transistor Q1 and a first resistor R1, wherein the source of the first power field-effect transistor Q1 is connected with the anode of the master station dc power supply module 111, the drain of the first power field-effect transistor Q1 is connected with the master station rectifier bridge circuit 114, and the gate of the first power field-effect transistor Q1 is connected with one end of the first resistor R1. The first power field effect transistor Q1 is preferably of the type: IRF4905 because IRF4905 has extremely low on-resistance, quick slew rate, and the recoverable avalanche breakdown grade of reinforcing, operating temperature can reach 170 degrees, and these characteristics make it become extremely high-efficient reliable, the device that the range of application is ultra wide the utility model discloses in, the requirement of bus current and reliability can be ensured. When the substation circuits 2 electrically connected with the master station circuit 1 have larger power consumption or more quantity, the requirement can be met by connecting a plurality of IRFs 4905 in parallel. The first resistor R1 preferably has a value of 22 Ω.

The main station rectifier bridge circuit 114 comprises a first double diode D1 and a second double diode D2 connected in parallel with the first double diode D1, the drain of the first power FET Q1 is connected with the connection point of the anodes of the first double diode D1 and the second double diode D2, and the connection point of the cathodes of the first double diode D1 and the second double diode D2 is grounded. In this embodiment, the first dual diode D1 and the second dual diode D2 are preferably of the following types: BAV23S, its switching speed can reach 50ns, continuous reverse voltage 200V, the biggest 250V of reverse peak voltage, the satisfying that can be fine the utility model discloses well rectifier bridge's performance requirement.

The electromagnetic compatibility protection circuit 115 is connected in parallel to a common connection point of the first double diode D1 and a common connection point of the second double diode D2, and includes two first transient diodes TVS1 connected in series in reverse direction, and is preferably of the type: SMBJ40CA can absorb the pulse interference, electrostatic discharge and reverse voltage generated by inductive load in transient state to protect the devices of main station circuit 1.

The master station carrier circuit 12 comprises a master station micro-control module 121 and a master station carrier modulation and demodulation circuit 122 connected in parallel with the master station micro-control module 121, the master station carrier modulation and demodulation circuit 122 is connected in parallel with the bus driving circuit 113, the master station carrier modulation and demodulation circuit 122 modulates the communication signal of the master station micro-control module 121 to the direct current voltage provided by the master station direct current power supply module 111, and a pair of nonpolar carrier signals is formed through the bus driving circuit 113 and the master station rectifier bridge circuit 114; otherwise, the carrier signal transmitted from the transmission bus is restored to a unipolar carrier signal through the main station rectifier bridge circuit 114, and then demodulated by the main station carrier modulation and demodulation circuit 122 to form a communication signal, which is sent to the main station micro control module 121.

The master station carrier modulation and demodulation circuit 122 comprises a first control module U1, the first control module U1 is a master station direct current carrier control chip, control signals are modulated on a power supply cable, the traditional separated control cable and the traditional separated power supply cable are replaced, full-amplitude voltage is adopted for sending, and high-communication anti-interference capacity is provided. The first control module U1 may provide power management functions for the bus, enabling power supply, communication, and fault monitoring of the bus. The first control module U1 has the following characteristics: the bus can supply power, and the communication and the power supply do not need electrical isolation; the bus has strong anti-interference capability and can be connected with the mains supply in parallel; can support a bus current of 20A (2400 bps); the bus short circuit protection is provided, and the short circuit is removed to automatically recover the bus; a fault signal reporting function; 256 devices can be hooked at the same time; the communication distance can reach 3000 m; supporting non-polar wiring; any topology wiring is supported: tree, star, bus; no special cable requirement exists; more recent lower cost solutions; the maximum bus voltage can reach 48V; the transparent serial port protocol is compatible with the original RS485 system; supporting 9600bps and 2400bps half-duplex communication; the design can be isolated or not, and the electromagnetic compatibility characteristic is ensured.

The pin number 9 function of the first control module U1 is serial data reception; pin number 14 function is serial data transmission; the No. 6 pin has the function of inputting a direct-current power supply; the No. 4 pin has the function of driving a power field effect transistor; pin 3 functions as a dc carrier bus output. Pin 9 of the first control module U1 is connected to a Transmit (TX) pin of the master station micro control module 121, pin 14 of the first control module U1 is connected to a Receive (RX) pin of the master station micro control module 121, pin 6 of the first control module U1 is connected to the positive electrode of the master station dc power supply module 111 (i.e., the source of the first power fet Q1), pin 4 of the first control module U1 is connected to the other end of the first resistor R1, pin 3 of the first control module U1 is connected to the drain of the first power fet Q1,

pins

2, 5, and 12 of the first control module U1 are grounded, and pin 1 of the first control module U1 is connected to a voltage of 12V.

The carrier voltage that the first control module U1 can support can be as high as 48V, which solves the problem of long-distance carrier communication, and the relationship between the carrier voltage and the transmission distance is briefly analyzed as follows:

the carrier voltage of the master station is V1, the lowest allowed carrier voltage of the substation is V2=12V, the sum of the powers of all substation devices on the bus is P =20W, the bus cable loss R10=0.1 Ω/m, and for simplifying the calculation, the influence of the positions of the substations on the bus on the voltage and the current and the influence of the bus impedance on the current and the voltage at each position can be simply estimated as follows:

when V1=48V, the total current I = P/V1=20/48=0.12A of each substation, and the differential pressure V = V1-V2=48-12=36V allowed by the bus, so that the total impedance R = V/I =36/0.12=300 Ω allowed by the bus, and the total length = R/R1=300/0.1=3000m allowed by the cable.

When V1=24 volts, the total current I = P/V1=20/24=0.83A of each substation, and the differential pressure V = V1-V2=24-12=12V allowed by the bus, so that the total impedance R = V/I =12/0.83=14.5 Ω allowed by the bus, and the total length = R/R1=14.5/0.1=145m allowed by the cable.

Under the condition of the same load, 3000 meters can be transmitted when the carrier voltage is 48V, only 145 meters can be transmitted when the carrier voltage is 24V, data can be slightly changed in actual use, and the networking mode of the substation is related to the installation position and the quality of the cable.

As shown in fig. 3, the substation circuit 2 includes a substation dc circuit 21 and a substation carrier circuit 22 connected in parallel to the substation dc circuit 21. The substation direct-current circuit 21 comprises a bus protection circuit 211 connected with the electromagnetic compatibility protection circuit in parallel through a transmission bus, a substation rectifier bridge circuit 212 connected with the bus protection circuit 211 in parallel, and a substation power extraction circuit 213 connected with the substation rectifier bridge circuit 212 in series.

The bus protection circuit 211 comprises a recoverable fuse F1 and two second transient diodes TVS2 connected in reverse series, one end of the recoverable fuse F1 is connected to one output end of the electromagnetic compatibility protection circuit, the other end of the recoverable fuse F1 is connected to one end of the two second transient diodes TVS2 connected in reverse series, and the other end of the two second transient diodes TVS2 connected in reverse series is connected to the other output end of the electromagnetic compatibility protection circuit. The function of the resettable fuse F1 is to prevent short circuits and reduce power-on shock. If a slave station becomes damaged and becomes shorted, the recoverable fuse F1 can disconnect the slave station from the bus without affecting the bus and other slave stations. The second transient diode TVS2 is preferably of the type: the SMBJ40CA can absorb the impulse interference, electrostatic discharge and reverse voltage generated by inductive load in transient state to protect the sub-station circuit 2 device.

The substation rectifier bridge circuit 212 includes a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6, and constitutes a full-wave rectifier bridge. The connection point of the anode of the third diode D3 and the cathode of the fourth diode D4 is connected to the other end of the recoverable fuse F1, and the connection point of the anode of the fifth diode D5 and the cathode of the sixth diode D6 is connected to the other ends of the two reverse series-connected transient diodes TVS 2. The connection point of the anode of the sixth diode D6 and the anode of the fourth diode D4 is grounded, and the connection point of the cathode of the fifth diode D5 and the cathode of the third diode D3 is connected to the substation power extraction circuit 213. The preferred type of diode is: IN4007 has strong forward surge bearing capacity, rated current 1A, withstand voltage 700V, maximum reverse leakage current 5uA, forward voltage drop 1.0V, maximum reverse peak current 30uA, working temperature: the temperature is-50 ℃ to +150 ℃, and the requirement of the substation rectifier bridge circuit 212 can be well met.

The substation power extraction circuit 213 includes a substation regulator module 2131, a second capacitor C2, and a seventh diode D7, a connection point between a negative electrode of the fifth diode D5 and a negative electrode of the third diode D3 is connected to a positive electrode of the seventh diode D7, a negative electrode of the seventh diode D7 is connected to a positive electrode of the substation regulator module 2131, one end of the second capacitor C2 is connected to the positive electrode of the substation regulator module 2131, and the other end is connected to the negative electrode of the substation regulator module 2131. The power supply of the substation circuit 2 is from the master station circuit 1, and no additional power supply is required. The nonpolar bus carrier signal forms a unipolar modulation signal after passing through the substation rectifier bridge circuit 212, the modulation signal is connected to the substation power extraction circuit 213, is rectified by a seventh diode D7 and stabilized by a second capacitor C2, and then is input to the substation voltage stabilization module 2131, so as to generate the working voltage required by the substation circuit 2.

The sub-station carrier circuit 22 is connected in parallel between the sub-station rectifier bridge circuit and the sub-station power extraction circuit 213. The system comprises a substation micro-control module 221 and a substation carrier modulation and demodulation circuit 222 which is connected with the substation micro-control module 221 in parallel.

The sub-station carrier modulation and demodulation circuit 222 comprises a second control module U2, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a triode T1, the second control module U2 is a sub-station direct current carrier control chip matched with the first control module U1, the baud rate of the sub-station direct current carrier control chip is self-adaptive according to the setting of the main station, and the sub-station direct current carrier control chip receives and transmits self-adaptive data supporting 8-bit 9-bit data, and the 9 th bit can be a data bit, a check bit and an address bit. The second control module U2 has the following characteristics: the bus can supply power, and the communication and the power supply do not need electrical isolation; the bus has strong anti-interference capability and can be connected with the mains supply in parallel; 256 devices can be hooked at the same time; the communication distance can reach 3000 m; supporting non-polar wiring; any topology wiring is supported: tree, star, bus; no special cable requirement exists; the maximum bus voltage can reach 48V; the transparent serial port protocol is compatible with the original RS485 system; self-adaptive 9600bps and 2400bps half-duplex communication; a low cost solution; the design can be isolated or not, and the electromagnetic compatibility characteristic is ensured.

The No. 3 pin function of the second control module U2 is serial data receiving; pin number 2 function is serial data transmission; the No. 5 pin of the second control module U2 is used for outputting a direct current carrier signal; pin 6 of the second control module U2 functions as a dc carrier signal input. A pin 3 of the second control module U2 is connected to a Transmission (TX) pin of the substation micro control module 221, a pin 2 of the second control module U2 is connected to a Reception (RX) pin of the substation micro control module 221, and a pin 1 of the second control module U2 is connected to the anode of the substation voltage stabilizing module 2131; pin 8 of the second control module U2 is grounded; the pin 6 of the second control module U2 is connected to the anode of the seventh diode D7 through the second resistor R2, and the pin 6 is also connected to ground through the third resistor R3. Pin 6 of the second control module U2 is connected to the base of the transistor T1 through a fifth resistor R5, the emitter of the transistor T1 is connected to the connection point of the fifth diode D5 and the third diode D3, and the collector of the transistor T1 is grounded through a fourth resistor R4. The triode T1, the fourth resistor R4 and the fifth resistor R5 amplify the power of the output signal, and the second resistor R2 and the third resistor R3 play a role in voltage division so as to meet the level requirement of the input adaptive first control module U1.

The utility model discloses a main website circuit 1's theory of operation does:

the master station circuit 1 transmits a signal: when the master station circuit 1 sends a signal, the TX pin of the master station micro control module 121 sends a signal to the pin 9 of the first control module U1, the first control module U1 modulates the signal to a carrier voltage, outputs a modulated carrier signal from the pin 4, the signal is loaded to the gate of the first power fet Q1 through the first resistor R1, the source of the first power fet Q1 is connected to the unmodulated carrier voltage, an on-off timing sequence corresponding to a communication signal pulse is formed between the two poles, so as to output the modulated carrier signal, the output power of the modulated carrier signal is determined by the first power fet Q1, the pin 4 output of the first control module U1 only plays a control role, and thus, a large bus output power can be ensured. The modulated signal and the ground wire are respectively connected to the positive and negative ends of a main station rectifier bridge formed by a first double diode D1 and a second double diode D2, and a pair of nonpolar modulated carrier signal buses are output from the other two ends of the rectifier bridge.

The master station circuit 1 receives signals: when the sub-station circuit 2 transmits signals to the main station circuit 1 through the bus, a single-polarity modulated carrier signal is formed through a main station rectifier bridge formed by the first double diode D1 and the second double diode D2, the signal is transmitted to the pin 3 of the first control module U1, the first control module U1 demodulates the modulated signal to form an RX communication signal, and the RX communication signal is transmitted to the RX pin of the main station micro control module 121 from the pin 14 of the first control module U1, so that the signal reception is completed.

The utility model discloses a sub-station circuit 2's theory of operation does:

the substation circuit 2 receives signals: the bus carrier signal forms a unipolar modulated carrier signal after passing through a substation rectifier bridge formed by diodes D3-D6, the signal is connected to a substation power extraction circuit 213, a 3.3V or 5V power required by a substation circuit 2 is generated after voltage stabilization, and working voltage is provided for devices such as a substation micro control module 221 and a second control module U2; meanwhile, the unipolar modulated carrier signal is divided by the second resistor R2 and the third resistor R3 and then input to the pin 6 of the second control module U2, demodulated by the second control module U2 to form a communication signal, and sent to the RX pin of the sub-station micro control module 221 through the pin 2 of the second control module U2.

The substation circuit 2 transmits a signal: when the substation circuit 2 sends a signal, the TX pin of the substation micro control module 221 sends a signal to the pin No. 3 of the second control module U2, the second control module U2 modulates the signal to a carrier voltage, and outputs a modulated carrier signal from the pin No. 5, the signal is loaded on a unipolar carrier through a power amplifier composed of a transistor T1, a fourth resistor R4, and a fifth resistor R5, the unipolar carrier signal and a ground wire are respectively connected to the positive and negative ends of the substation rectifier bridge, and a pair of nonpolar modulated signal buses are output from the other two ends of the substation rectifier bridge, thereby completing the transmission of the substation signal.

The utility model discloses a direct current carrier communication circuit, main website carrier circuit modulate the direct current voltage that communication signal provided to main website direct current circuit, and transmit for the sub-station direct current circuit through the transmission bus, the sub-station direct current circuit draws the voltage in the carrier signal on the transmission bus and supplies power for the sub-station circuit, sub-station carrier circuit demodulation carrier signal forms communication signal; the substation carrier circuit modulates the communication signal to the carrier voltage of the substation direct-current circuit and transmits the communication signal to the main station circuit through the transmission bus, the main station carrier circuit demodulates the carrier signal on the transmission bus to form the communication signal, and a pair of conducting wires are adopted between the main station circuit and the substation circuit to realize the power supply and communication functions at the same time, so that the substation carrier circuit is simple in structure, convenient to wire and wide in application range; the first control module U1 of the master station circuit adopts a master station direct current carrier control chip, the second control module U2 of the slave station circuit adopts a slave station direct current carrier control chip matched with the first control module U1, and the highest voltage supported by the two chips is 48V, so that the high-voltage direct current carrier control chip is suitable for long-distance transmission and hanging of more slave stations, the construction cost is reduced, and the stability and reliability of communication are guaranteed; the method comprises the steps that a main station rectifier bridge circuit is arranged on a main station circuit, a sub-station rectifier bridge circuit is arranged on a sub-station circuit, unipolar modulated carrier signals output by the main station direct current circuit are rectified by the main station rectifier bridge circuit to form nonpolar modulated carrier signals, and the nonpolar modulated carrier signals are transmitted to the sub-station circuit; the unipolar modulated carrier signal output by the substation direct-current circuit is rectified by the substation rectifier bridge circuit to form a nonpolar modulated carrier signal and is transmitted to the main station circuit, and the main station rectifier bridge circuit receives the nonpolar modulated carrier signal and rectifies the nonpolar modulated carrier signal to form the unipolar modulated carrier signal, so that bidirectional rectification is realized, the transmission line is truly nonpolar, and the reliability of communication and equipment is guaranteed.

It should be noted that the above-mentioned preferred embodiments are only for illustrating the technical concepts and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, and the protection scope of the present invention cannot be limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a non-polarity direct current carrier communication circuit, its includes main website circuit (1) and with a plurality of sub-station circuit (2) of main website circuit (1) electricity connection, its characterized in that: the main station circuit (1) comprises a main station direct current circuit (11) and a main station carrier circuit (12) connected with the main station direct current circuit (11) in parallel, the main station direct current circuit (11) comprises a main station rectifier bridge circuit (114), the substation circuit (2) comprises a substation direct current circuit (21) and a substation carrier circuit (22) connected with the substation direct current circuit (21) in parallel, and the substation direct current circuit (21) comprises a substation rectifier bridge circuit (212);

the unipolar modulated carrier signal output by the master station direct current circuit (11) is rectified by the master station rectifier bridge circuit (114) to form a nonpolar modulated carrier signal and is transmitted to the slave station circuit (2), and the slave station rectifier bridge circuit (212) receives the nonpolar modulated carrier signal and rectifies the nonpolar modulated carrier signal to form the unipolar modulated carrier signal;

the unipolar modulated carrier signal output by the substation direct-current circuit (21) is rectified by the substation rectifier bridge circuit (212) to form a nonpolar modulated carrier signal and is transmitted to the master station circuit (1), and the master station rectifier bridge circuit (114) receives the nonpolar modulated carrier signal and rectifies the nonpolar modulated carrier signal to form the unipolar modulated carrier signal.

2. The non-polar dc carrier communication circuit of claim 1, wherein: the main station rectifier bridge circuit (114) includes a first dual diode D1 and a second dual diode D2 in parallel with the first dual diode D1.

3. The non-polar dc carrier communication circuit of claim 2, wherein: the main station direct current circuit (11) further comprises a main station direct current power supply module (111) and a bus driving circuit (113) connected with the main station direct current power supply module (111) in series, and the main station rectifier bridge circuit (114) is connected with the bus driving circuit (113) in series.

4. The non-polar dc carrier communication circuit of claim 3, wherein: the bus driving circuit (113) comprises a first power field-effect transistor Q1, the source electrode of the first power field-effect transistor Q1 is connected with the anode of the main station direct current power supply module (111), the drain electrode of the first power field-effect transistor Q1 is connected with the anode connection point of the first double diode D1 and the second double diode D2, and the cathode connection point of the first double diode D1 and the second double diode D2 is grounded.

5. The non-polar dc carrier communication circuit of claim 3, wherein: the main station direct-current circuit (11) further comprises an electromagnetic compatibility protection circuit (115), the electromagnetic compatibility protection circuit (115) is connected in parallel to a common connection point of the first double diode D1 and a common connection point of the second double diode D2, and the electromagnetic compatibility protection circuit (115) is connected with the substation circuit (2) through a transmission bus.

6. The non-polar dc carrier communication circuit of claim 3, wherein: the main station direct current circuit (11) further comprises a voltage stabilization protection circuit (112) connected with the main station direct current power supply module (111) in parallel.

7. The non-polar dc carrier communication circuit according to any one of claims 1 to 6, wherein: the substation rectifier bridge circuit (212) comprises a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6, and the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6 form a full-wave rectifier bridge.

8. The non-polar dc carrier communication circuit of claim 7, wherein: the substation direct-current circuit (21) further comprises a bus protection circuit (211) connected with the main station circuit (1), one end of the bus protection circuit (211) is connected with a connection point where the anode of the third diode D3 is connected with the cathode of the fourth diode D4, and the other end of the bus protection circuit (211) is connected with a connection point where the anode of the fifth diode D5 is connected with the cathode of the sixth diode D6.

9. The non-polar dc carrier communication circuit of claim 8, wherein: the bus protection circuit (211) comprises a recoverable fuse F1 and two second transient diodes TVS2 which are connected in reverse series, one end of the recoverable fuse F1 is connected with one output end of the main station circuit (1), the other end of the recoverable fuse F1 is connected with one end of the two second transient diodes TVS2 which are connected in reverse series, the other end of the two second transient diodes TVS2 which are connected in reverse series is connected with the other output end of the main station circuit (1), the other end of the recoverable fuse F1 is connected with a connection point of the third diode D3 and the fourth diode D4, and the other end of the two second transient diodes TVS2 which are connected in reverse series is connected with a connection point of the positive pole of the fifth diode D5 and the negative pole of the sixth diode D6.

10. The non-polar dc carrier communication circuit of claim 7, wherein: the substation direct-current circuit (21) further comprises a substation power extraction circuit (213), a connection point of a negative electrode of the fifth diode D5 and a negative electrode of the third diode D3 is connected with the substation power extraction circuit (213), and a connection point of an anode of the sixth diode D6 and an anode of the fourth diode D4 is grounded.