DTU communication circuit

Abstract

The invention relates to the technical field of DTU communication interaction equipment, in particular to a DTU communication circuit, which comprises a current acquisition module, a remote signaling input module, a remote control output module, a control module, an RS485 communication module and a 4G communication module, and is characterized in that the control module is electrically connected with the current acquisition module, the remote signaling input module, the remote control output module, the RS485 communication module and the 4G communication module; the remote signaling input module is electrically connected with an external switching value device, and the current acquisition module is used for acquiring a three-phase alternating current of a single line, so that the three-phase alternating current of the single line can be monitored and acquired, real-time data analysis can be performed, and cable current fault information can be identified; the remote signaling input module is electrically connected with an external switching value device, so that the circuit can support the switching value device to be directly connected to the device, and the remote control output module outputs a passive signal.

Description

Technical Field

[0001] The present invention relates to the technical field of DTU communication interaction devices, and particularly to a DTU communication circuit. Background Art

[0002] Traditional DTU communication devices are generally considered as data processing terminals with wireless communication, which use RS232 or RS485 communication interfaces to transmit data remotely through a base station, and only support the data conversion mode of existing devices. When applied to a distribution monitoring terminal, a 1+1 or 1+N connection mode needs to be adopted, resulting in a large number of devices and occupying a large space. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a DTU communication circuit that integrates common remote signaling, remote control, and remote measurement.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: A DTU communication circuit includes a current acquisition module, a remote signaling input module, a remote control output module, a control module, an RS485 communication module, and a 4G communication module. The control module is electrically connected to the current acquisition module, the remote signaling input module, the remote control output module, the RS485 communication module, and the 4G communication module respectively. The remote signaling input module is electrically connected to a switching device of an external device, and the current acquisition module is used to acquire three-phase alternating current of a single line.

[0005] The beneficial effects of the present invention are as follows: By setting a current acquisition module, a remote signaling input module, a remote control output module, a control module, an RS485 communication module, and a 4G communication module in this solution, the control module is electrically connected to the current acquisition module, the remote signaling input module, the remote control output module, the RS485 communication module, and the 4G communication module respectively; the current acquisition module is used to acquire three-phase alternating current of a single line, so that it can monitor and acquire three-phase alternating current of a single line, perform real-time data analysis, and identify cable current fault information; the remote signaling input module is electrically connected to a switching device of an external device, so that the circuit can support the direct access of the switching device to the device, and the remote control output module outputs a passive signal; the remote transmission communication in this solution is implemented by a 4G wireless transmission module, with stable and fast speed; the RS485 communication module can support devices with an RS485 communication protocol to achieve a real-time communication mode; the DTU communication circuit designed in this solution is used in a distribution monitoring system, which can collect common information of distribution equipment, collect line current fault information, execute remote control commands, and achieve the functions of fault isolation and on-site alarm; it can integrate the common acquisition functions, remote control, and remote signaling functions of distribution monitoring, so as to greatly reduce the wiring and equipment configuration of on-site devices, and at the same time meet the conventional DTU communication remote transmission function. Brief Description of the Drawings

[0006] Figure 1 It is the connection block diagram of the DTU communication circuit of the present invention; Figure 2 It is the circuit schematic diagram of the remote signal input module of the DTU communication circuit of the present invention; Figure 3 It is the circuit schematic diagram of the remote control output module of the DTU communication circuit of the present invention; Figure 4 It is the circuit schematic diagram of the current acquisition module of the DTU communication circuit of the present invention; Figure 5 It is a partial circuit schematic diagram of the 4G communication module of the DTU communication circuit of the present invention; Figure 6 It is a partial circuit schematic diagram of the 4G communication module of the DTU communication circuit of the present invention; Figure 7 It is a partial circuit schematic diagram of the 4G communication module of the DTU communication circuit of the present invention; Figure 8 It is a partial circuit schematic diagram of the control module and the RS485 communication module of the DTU communication circuit of the present invention; Label description: 1. Current acquisition module; 2. Remote signal input module; 3. Remote control output module; 4. Control module; 5. RS485 communication module; 6. 4G communication module. Specific implementation mode

[0007] To describe in detail the technical content, achieved purpose and effects of the present invention, the following is described in conjunction with the implementation mode and accompanied by the drawings.

[0008] Please refer to Figure 1 , the technical solution adopted by the present invention is: A DTU communication circuit, including a current acquisition module, a remote signal input module, a remote control output module, a control module, an RS485 communication module and a 4G communication module, the control module is electrically connected to the current acquisition module, the remote signal input module, the remote control output module, the RS485 communication module and the 4G communication module respectively, the remote signal input module is electrically connected to the switch device of the external device, and the current acquisition module is used to collect the three-phase alternating current of a single line.

[0009] From the above description, it can be seen that the beneficial effect of the present invention is: This solution is configured with a current acquisition module, a telemetry input module, a remote control output module, a control module, an RS485 communication module, and a 4G communication module. The control module is electrically connected to the current acquisition module, the telemetry input module, the remote control output module, the RS485 communication module, and the 4G communication module respectively. The current acquisition module is used to collect the three-phase alternating current of a single line, enabling the monitoring and acquisition of the three-phase alternating current of a single line, real-time data analysis, and the identification of cable current fault information. The telemetry input module is electrically connected to the external switching device, allowing the circuit to support the direct access of the switching device to the device. The remote control output module outputs a passive signal. The long-distance communication in this solution is implemented using a 4G wireless transmission module, with stable and fast speed. The RS485 communication module can support devices with the RS485 communication protocol to achieve the real-time communication mode. The DTU communication circuit designed in this solution is used for the distribution monitoring system, which can collect the common information of distribution equipment, collect line current fault information, execute remote control commands, and achieve the functions of fault isolation and on-site warning. It can integrate the common acquisition functions, remote control, and telemetry functions of distribution monitoring, thus greatly reducing the wiring and equipment configuration of on-site devices while meeting the long-distance transmission function of conventional DTU communication.

[0010] Further, the telemetry input module includes a resistor R4, a diode D1, and an optocoupler U1. One end of the resistor R4 is connected to the 5V power supply, the other end of the resistor R4 is electrically connected to one end of the light-emitting source of the optocoupler U1. The other end of the light-emitting source of the optocoupler U1 is electrically connected to the anode of the diode D1. The cathode of the diode D1 is electrically connected to the external switching device. One end of the light-receiving device of the optocoupler U1 is connected to the 3.3V power supply, and the other end of the light-receiving device of the optocoupler U1 is electrically connected to the control module.

[0011] Further, the telemetry input module further includes a capacitor C3. One end of the capacitor C3 is electrically connected to the other end of the resistor R4 and one end of the light-emitting source of the optocoupler U1 respectively. The other end of the capacitor C3 is electrically connected to the anode of the diode D1 and the other end of the light-emitting source of the optocoupler U1 respectively.

[0012] Further, the telemetry input module further includes a resistor R8 and a capacitor C4. One end of the resistor R8 is electrically connected to the other end of the light-receiving device of the optocoupler U1, one end of the capacitor C4, and the control module respectively. The other end of the resistor R8 is electrically connected to the other end of the capacitor C4, and the other end of the resistor R8 and the other end of the capacitor C4 are both grounded.

[0013] Further, the remote control output module includes a first driving unit, a second driving unit, and a relay K1. The second driving unit is electrically connected to the first driving unit and the coil of the relay K1 respectively. The contact group of the relay K1 is electrically connected to the control module.

[0014] Further, the first driving unit includes a resistor R19, a resistor R16, and a triode Q2. One end of the resistor R19 is electrically connected to the base of the triode Q2. The emitter of the triode Q2 is grounded. The collector of the triode Q2 is electrically connected to one end of the resistor R16 and the second driving unit respectively. The other end of the resistor R16 is connected to a 5V power supply.

[0015] Further, the second driving unit includes a resistor R18 and a triode Q1. One end of the resistor R18 is electrically connected to the first driving unit. The other end of the resistor R18 is electrically connected to the base of the triode Q1. The emitter of the triode Q1 is grounded. The collector of the triode Q1 is electrically connected to the coil of the relay K1.

[0016] Further, the remote control output module further includes a diode D2. The cathode of the diode D2 is electrically connected to one end of the coil of the relay K1, and both the cathode of the diode D2 and one end of the coil of the relay K1 are connected to a 5V power supply. The anode of the diode D2 is electrically connected to the second driving unit and the other end of the coil of the relay K1 respectively.

[0017] Further, the current acquisition module includes a sampling chip U2 and three current sampling units. The three current sampling units are respectively used to acquire the three-phase alternating current of a single line. The sampling chip U2 is electrically connected to the control module and the three current sampling units respectively.

[0018] Further, the 4G communication module includes a 4G communication integrated chip, an input level adaptive unit, an output level adaptive unit, and a SIM card J1. The 4G communication integrated chip is electrically connected to the input level adaptive unit, the output level adaptive unit, and the SIM card J1 respectively.

[0019] Please refer to Figures 1 to 7 As shown in the figure, Embodiment 1 of the present invention is as follows: Please refer to Figure 1 As shown in the figure, a DTU communication circuit includes a current acquisition module 1, a remote signal input module 2, a remote control output module 3, a control module 4, an RS485 communication module 5, and a 4G communication module 6. The control module 4 is electrically connected to the current acquisition module 1, the remote signal input module 2, the remote control output module 3, the RS485 communication module 5, and the 4G communication module 6 respectively. The remote signal input module 2 is electrically connected to the switch quantity device of the peripheral device. The current acquisition module 1 is used to acquire the three-phase alternating current of a single line.

[0020] Please refer to Figure 2, the remote signal input module 2 includes a resistor R4, a diode D1, and an optocoupler U1. One end of the resistor R4 is connected to a 5V power supply, and the other end of the resistor R4 is electrically connected to one end of the light-emitting source of the optocoupler U1. The other end of the light-emitting source of the optocoupler U1 is electrically connected to the anode of the diode D1. The cathode of the diode D1 is electrically connected to an external switch quantity device. One end of the light-receiving device of the optocoupler U1 is connected to a 3.3V power supply, and the other end of the light-receiving device of the optocoupler U1 is electrically connected to the control module 4.

[0021] Please refer to Figure 2 , the remote signal input module 2 further includes a capacitor C3. One end of the capacitor C3 is electrically connected to the other end of the resistor R4 and one end of the light-emitting source of the optocoupler U1 respectively. The other end of the capacitor C3 is electrically connected to the anode of the diode D1 and the other end of the light-emitting source of the optocoupler U1 respectively.

[0022] Please refer to Figure 2 , the remote signal input module 2 further includes a resistor R8 and a capacitor C4. One end of the resistor R8 is electrically connected to the other end of the light-receiving device of the optocoupler U1, one end of the capacitor C4, and the control module 4 respectively. The other end of the resistor R8 is electrically connected to the other end of the capacitor C4, and the other end of the resistor R8 and the other end of the capacitor C4 are both grounded.

[0023] AN_IN and the COM port (GND) are input contacts, and signal pushing is carried out in an isolated manner. The power supply VCC5V passes through a resistor R4 to provide a forward current for the forward end of the optocoupler U1. After passing through a diode D1, it is connected to the external switch quantity output point. When there is external switch quantity information, the optocoupler U1 is driven to conduct, and the signal is isolated and output to AN1; the remote signal input module uses the isolation transmission performance of the optocoupler as the transmission basis. The resistor R4 is used as a current-limiting resistor to prevent the optocoupler U1 from being burned out due to overcurrent. The diode D1 uses the one-way conduction performance to prevent fault problems caused by misconnection. The capacitor C3 filters and anti-interferes the input signal. The resistor R8 pulls down to the ground to ensure that there is no interference signal in the input main control unit when there is no input. The capacitor C4 further filters and anti-interferes, so as to obtain a stable remote signal.

[0024] Please refer to Figure 3 , the remote control output module 3 includes a first driving unit, a second driving unit, and a relay K1. The second driving unit is electrically connected to the first driving unit and the coil of the relay K1 respectively. The contact group of the relay K1 is electrically connected to the control module 4.

[0025] Please refer to Figure 3, the first driving unit includes a resistor R19, a resistor R16, and a triode Q2. One end of the resistor R19 is electrically connected to the base of the triode Q2. The emitter of the triode Q2 is grounded. The collector of the triode Q2 is respectively electrically connected to one end of the resistor R16 and the second driving unit. The other end of the resistor R16 is connected to a 5V power supply.

[0026] Please refer to Figure 3 , the second driving unit includes a resistor R18 and a triode Q1. One end of the resistor R18 is electrically connected to the first driving unit. The other end of the resistor R18 is electrically connected to the base of the triode Q1. The emitter of the triode Q1 is grounded. The collector of the triode Q1 is electrically connected to the coil of the relay K1.

[0027] Please refer to Figure 3 , the remote control output module 3 further includes a diode D2. The cathode of the diode D2 is electrically connected to one end of the coil of the relay K1, and both the cathode of the diode D2 and one end of the coil of the relay K1 are connected to a 5V power supply. The anode of the diode D2 is respectively electrically connected to the second driving unit and the other end of the coil of the relay K1.

[0028] The remote control output module 3 uses multiple driving relay outputs. The triode Q1 uses a high-power N-channel triode to ensure stable relay output. The diode D2 is a protection device that absorbs the excess energy of the coil of the relay K1.

[0029] The remote control output module utilizes the isolation function of the relay to output a remote control signal externally. The resistor R19 is connected to the main control I / O port to drive the triode Q2 to act. When acting, the triode Q2 is in a saturated conduction state. The resistor R16 plays a pull-up and clamping role. The resistor R18 serves as the driving resistor for the high-power N-channel triode Q1. When the main control unit sends a command, the relay outputs a passive signal node externally as the remote control output signal.

[0030] Please refer to Figure 4 , the current acquisition module 1 includes a sampling chip U2 and three current sampling units. The three current sampling units are respectively used to collect the three-phase alternating current of a single line. The sampling chip U2 is respectively electrically connected to the control module 4 and the three current sampling units.

[0031] The three current acquisition units are respectively a first current acquisition unit, a second current acquisition unit, and a third current acquisition unit. The first current acquisition unit includes resistor R1, resistor R2, capacitor C1, resistor R3, resistor R5, and capacitor C3. The second current acquisition unit includes resistor R9, resistor R10, capacitor C5, resistor R14, resistor R17, and capacitor C7. The third current acquisition unit includes resistor R20, resistor R21, capacitor C10, resistor R23, resistor R24, and capacitor C12. For the specific connection relationships between their respective components, please refer to Figure 4 ; The current acquisition module 1 further includes resistor R6, resistor R7, resistor R11, resistor R12, resistor R13, resistor R15, capacitor C6, crystal oscillator XT1, capacitor C8, capacitor C9, resistor R22, and capacitor C11. For the specific connection relationships between their respective components, please refer to Figure 4 .

[0032] The 4G communication module 6 includes a 4G communication integrated chip, an input level adaptive unit, an output level adaptive unit, and a SIM card J1. The 4G communication integrated chip is electrically connected to the input level adaptive unit, the output level adaptive unit, and the SIM card J1 respectively.

[0033] The 4G communication integrated chip includes chip U3A and chip U3B. For the specific connection relationships between their respective components, please refer to Figure 5 .

[0034] The input level adaptive unit includes resistor R32, resistor R37, triode Q3, and resistor R38. The output level adaptive unit includes resistor R33, resistor R39, triode Q4, and resistor R40. For the specific connection relationships between their respective components, please refer to Figure 6 .

[0035] The 4G communication module 6 further includes capacitor C23, capacitor C24, capacitor C22, capacitor C25, resistor R36, resistor R41, resistor R42, resistor R35, and chip U5. For the specific connection relationships between their respective components, please refer to Figure 7 .

[0036] The 4G communication module mainly consists of a 4G main processing module, a signal interaction module, and a SIM card interaction module. Among them, chip U3A and chip U3B constitute the 4G main processing module, which integrates the 4G base station network processing protocol internally. Real-time communication can be completed only through the TX, RX signals, and the SIM card. The signal interaction module adopts an input level adaptive unit circuit. Resistor R32 and resistor R37 constitute the self-driving voltage conditioning circuit of triode Q3 to ensure that the emitter voltage of the triode is at the same level as the driving end. Resistor R38 is a pull-up resistor, enabling the device to transmit data between different voltage levels; the SIM card interaction module consists of a SIM card plus a peripheral protection circuit. Chip U5 is an electrostatic immunity IC for anti-interference. Resistors R36, R41, and R42 are current-limiting resistors, resistor R35 is a pull-up resistor, and capacitors C23, C24, and C25 are filter capacitors.

[0037] The main control module includes main control unit U9. The RS485 communication module includes resistors R31, R34, R44, R51, R52, R50, R48, R43, R49, R45, R47, R47, triode Q5, opto-isolation chips U7, U8, RS485 communication chip U6, and protection diodes VP1, VP2, VP3. The specific connection relationships among its various components are as follows Figure 8 .

[0038] Figure 8 Configure an isolated RS485 communication circuit for the main control module; opto-isolation chips U7 and U8 are used as isolation optocouplers for RX and TX signals respectively. Resistor R52, triode Q5, and resistor R50 are used for switching between receive and transmit. Resistor R50 is a current-limiting resistor, resistor R44 is a pull-up resistor. The DI pin of RS485 communication chip U6 is pulled down to ground, and the RO pin is pulled up to a high level; the A output loop is pulled up through resistor R43, and the B output loop is pulled down through resistor R49. Resistors R45 and R47 are respectively connected in series in the A and B output loops, and a matching resistor R46 is connected in parallel to ensure normal communication; protection diodes VP1, VP2, and VP3 are lightning and surge protection devices.

[0039] In summary, a DTU communication circuit provided by the present invention includes a current acquisition module, a telemetry input module, a remote control output module, a control module, an RS485 communication module, and a 4G communication module. The control module is electrically connected to the current acquisition module, the telemetry input module, the remote control output module, the RS485 communication module, and the 4G communication module respectively. The current acquisition module is used to collect the three-phase alternating current of a single line, so that it can monitor and collect the three-phase alternating current of a single line, perform real-time data analysis, and identify cable current fault information. The telemetry input module is electrically connected to the external switch device, so that the circuit can support the direct access of the switch device to the device, and the remote control output module outputs a passive signal. The long-distance communication in this solution is realized by a 4G wireless transmission module, with stable and fast speed. The RS485 communication module can support devices with the RS485 communication protocol to realize the real-time communication mode. The DTU communication circuit designed in this solution is used in the distribution monitoring system, which can collect the common information of distribution equipment, collect line current fault information, execute remote control commands, and realize the functions of fault isolation and on-site alarm. It can integrate the common acquisition functions, remote control, and telemetry functions of distribution monitoring, so as to greatly reduce the wiring and equipment configuration of on-site equipment, and at the same time meet the long-distance transmission function of conventional DTU communication.

[0040] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A DTU communication circuit, characterized in that, It includes a current acquisition module, a telemetry signal input module, a remote control output module, a control module, an RS485 communication module, and a 4G communication module. The control module is electrically connected to the current acquisition module, the telemetry signal input module, the remote control output module, the RS485 communication module, and the 4G communication module respectively. The telemetry signal input module is electrically connected to the switching device of the peripheral device. The current acquisition module is used to acquire the three-phase alternating current of a single line.

2. The DTU communication circuit according to claim 1, wherein, The telemetry signal input module includes a resistor R4, a diode D1, and an optocoupler U1. One end of the resistor R4 is connected to the 5V power supply. The other end of the resistor R4 is electrically connected to one end of the light-emitting source of the optocoupler U1. The other end of the light-emitting source of the optocoupler U1 is electrically connected to the anode of the diode D1. The cathode of the diode D1 is electrically connected to the switching device of the peripheral device. One end of the light-receiving device of the optocoupler U1 is connected to the 3.3V power supply. The other end of the light-receiving device of the optocoupler U1 is electrically connected to the control module.

3. The DTU communication circuit according to claim 2, characterized in that, The telemetry signal input module further includes a capacitor C3. One end of the capacitor C3 is electrically connected to the other end of the resistor R4 and one end of the light-emitting source of the optocoupler U1 respectively. The other end of the capacitor C3 is electrically connected to the anode of the diode D1 and the other end of the light-emitting source of the optocoupler U1 respectively.

4. The DTU communication circuit according to claim 2, characterized in that, The telemetry signal input module further includes a resistor R8 and a capacitor C4. One end of the resistor R8 is electrically connected to the other end of the light-receiving device of the optocoupler U1, one end of the capacitor C4, and the control module respectively. The other end of the resistor R8 is electrically connected to the other end of the capacitor C4, and the other end of the resistor R8 and the other end of the capacitor C4 are both grounded.

5. The DTU communication circuit according to claim 1, wherein, The remote control output module includes a first driving unit, a second driving unit, and a relay K1. The second driving unit is electrically connected to the first driving unit and the coil of the relay K1 respectively. The contact group of the relay K1 is electrically connected to the control module.

6. The DTU communication circuit according to claim 5, wherein The first driving unit includes a resistor R19, a resistor R16, and a triode Q2. One end of the resistor R19 is electrically connected to the base of the triode Q2. The emitter of the triode Q2 is grounded. The collector of the triode Q2 is electrically connected to one end of the resistor R16 and the second driving unit respectively. The other end of the resistor R16 is connected to the 5V power supply.

7. The DTU communication circuit according to claim 5, wherein, The second driving unit includes a resistor R18 and a triode Q1. One end of the resistor R18 is electrically connected to the first driving unit. The other end of the resistor R18 is electrically connected to the base of the triode Q1. The emitter of the triode Q1 is grounded. The collector of the triode Q1 is electrically connected to the coil of the relay K1.

8. The DTU communication circuit according to claim 5, wherein The remote control output module further includes a diode D2. The cathode of the diode D2 is electrically connected to one end of the coil of the relay K1, and the cathode of the diode D2 and one end of the coil of the relay K1 are both connected to the 5V power supply. The anode of the diode D2 is electrically connected to the second driving unit and the other end of the coil of the relay K1 respectively.

9. The DTU communication circuit according to claim 1, wherein, The current acquisition module includes a sampling chip U2 and three current sampling units. The three current sampling units are respectively used to collect three-phase alternating current of a single line, and the sampling chip U2 is electrically connected to the control module and the three current sampling units respectively.

10. The DTU communication circuit according to claim 1, characterized in that, The 4G communication module includes a 4G communication integrated chip, an input level adaptive unit, an output level adaptive unit and a SIM card J1. The 4G communication integrated chip is electrically connected to the input level adaptive unit, the output level adaptive unit and the SIM card J1 respectively.

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