Communication interface circuit and gateway and circuit breaker communication system

Abstract

The utility model discloses a communication interface circuit comprising a transceiver, a gateway transmit-receive unit and a breaker transmit-receive unit. The gateway transceiving unit comprises a first wiring terminal, a first resistor, a second resistor and a switching tube; the circuit breaker transmit-receive unit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a diode array and a second wiring terminal. The utility model also discloses a gateway and circuit breaker communication system. According to the utility model, the physical length of the differential bus and the number of connected intelligent circuit breakers are expanded, the anti-interference capability is improved, and the circuit is simple, low in cost and easy to realize and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of gateway communication, and in particular to a communication interface circuit and a gateway and circuit breaker communication system. Background Art

[0002] With the development of the times, Internet of Things technology has been widely used in industrial control and other automation control fields. When reliable transmission is required over long distances and in high-noise environments, when existing Internet of Things gateways communicate with smart circuit breakers, due to the limitation of communication distance, the number of connections between the gateway and the circuit breaker is small and the anti-interference ability is poor. Utility Model Content

[0003] The main purpose of the utility model is to provide a communication interface circuit and a gateway and circuit breaker communication system to solve the technical problems of the existing Internet of Things gateway and intelligent circuit breaker communication having a small number of node connections and poor anti-interference ability.

[0004] To achieve the above-mentioned object, in a first aspect, the utility model provides a communication interface circuit, including a transceiver, a gateway transceiver unit and a circuit breaker transceiver unit;

[0005] The gateway transceiver unit includes a first wiring terminal, a first resistor, a second resistor and a switch tube; the gateway transmitting end of the first wiring terminal is connected to the first end of the switch tube through the first resistor, the second end of the switch tube is grounded, the third end of the switch tube is simultaneously connected to the receiving enable end of the transceiver, the driving enable end of the transceiver and the first end of the second resistor, the second end of the second resistor is connected to the power supply, and the gateway receiving end of the first wiring terminal is connected to the receiving output end of the transceiver;

[0006] The circuit breaker transceiver unit includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a diode array and a second terminal; the first end of the third resistor is connected to the negative terminal of the differential signal of the transceiver, the second end of the third resistor is grounded through the sixth resistor, and is respectively connected to the first end of the diode array and the negative terminal of the differential bus of the second terminal; the first end of the fourth resistor is connected to the positive terminal of the differential signal of the transceiver, the second end of the fourth resistor is connected to the power supply through the fifth resistor, and is respectively connected to the second end of the diode array and the positive terminal of the differential bus of the second terminal; the third end of the diode array is grounded.

[0007] Preferably, the switch tube is an NPN transistor or an N-type MOS tube.

[0008] Preferably, the diode array includes a first TVS tube, a second TVS tube, a third TVS tube and a fourth TVS tube, the cathode of the first TVS tube is the first end of the diode array, the cathode of the third TVS tube is the second end of the diode array, the anode of the first TVS tube is connected to the anode of the second TVS tube, the anode of the third TVS tube is connected to the anode of the fourth TVS tube, and the cathode of the second TVS tube is connected to the cathode of the fourth TVS tube and is the third end of the diode array.

[0009] Preferably, the model of the diode array is SM712.

[0010] Preferably, the gateway transceiver unit further includes a seventh resistor; the seventh resistor is connected in series between the gateway receiving end of the first wiring terminal and the receiving output end of the transceiver.

[0011] Preferably, the transceiver is an RS485 transceiver.

[0012] Preferably, the power supply is a 5V DC power supply.

[0013] In a second aspect, the utility model also provides a gateway and circuit breaker communication system, comprising an intelligent gateway, an intelligent circuit breaker and a communication interface circuit as described in any one of the above items; the intelligent gateway is connected to the intelligent circuit breaker through the communication interface circuit.

[0014] The communication interface circuit and the gateway and circuit breaker communication system provided by the utility model have the following beneficial effects:

[0015] 1) The communication interface circuit of the utility model can realize the communication between the intelligent gateway and the intelligent circuit breaker through the transceiver, and expand the physical length of the differential bus and the number of connected intelligent circuit breakers;

[0016] 2) The communication interface circuit of the utility model can realize the purpose of automatic data transmission and reception by setting a switch tube in the gateway transceiver unit;

[0017] 3) The communication interface circuit of the utility model improves the anti-interference capability by setting a diode array in the circuit breaker transceiver unit;

[0018] 4) The communication interface circuit of the utility model has a simple structure, low cost, and is easy to implement and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a circuit schematic diagram of a communication interface circuit in one embodiment of the utility model;

[0021] Figure 2 A circuit schematic diagram of a communication interface circuit in another embodiment of the present utility model;

[0022] Figure 3 This is a structural schematic diagram of a gateway and circuit breaker communication system in one embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0024] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] The utility model provides a communication interface circuit for use in an intelligent gateway and an intelligent circuit breaker. Figure 1 and Figure 2 In one embodiment, the communication interface circuit includes a transceiver U1, a gateway transceiver unit 1 and a circuit breaker transceiver unit 2; wherein,

[0026] The gateway transceiver unit 1 includes a first wiring terminal J1, a first resistor R1, a second resistor R2 and a switch tube Q1; the gateway transmitting end G_TX of the first wiring terminal J1 is connected to the first end of the switch tube Q1 through the first resistor R1, the second end of the switch tube Q1 is grounded, the third end of the switch tube Q1 is simultaneously connected to the receiving enable end RE of the transceiver U1, the driving enable end DE of the transceiver and the first end of the second resistor R2, the second end of the second resistor R2 is connected to the power supply VCC, and the gateway receiving end G_RX of the first wiring terminal J1 is connected to the receiving output end RO of the transceiver U1;

[0027] The circuit breaker transceiver unit 2 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a diode array DA1 and a second terminal J2; the first end of the third resistor R3 is connected to the differential signal negative terminal B of the transceiver U1, the second end of the third resistor R3 is grounded through the sixth resistor R6, and is respectively connected to the first end of the diode array DA1 and the differential bus negative terminal C_B of the second terminal J2; the first end of the fourth resistor R4 is connected to the differential signal positive terminal A of the transceiver U1, the second end of the fourth resistor R4 is connected to the power supply VCC through the fifth resistor R5, and is respectively connected to the second end of the diode array DA1 and the differential bus positive terminal C_A of the second terminal J2; the third end of the diode array DA1 is grounded GND.

[0028] It can be understood that the transceiver U1 of this embodiment is preferably an RS485 transceiver, which includes a receiving output terminal RO, a receiving enable terminal RE, a driving enable terminal DE, a driving input terminal DI, a ground terminal GNG, a differential signal positive terminal A, a differential signal negative terminal B and a power supply terminal VCC. Among them, the driving input terminal DI and the ground terminal GNG of the transceiver U1 are both connected to the ground, and the power supply terminal VCC is connected to the power supply. As a preference, the power supply is a 5V DC power supply.

[0029] The gateway transceiver unit 1 of this embodiment mainly includes a first wiring terminal J1, a first resistor R1, a second resistor R2 and a switch tube Q1, wherein the first wiring terminal J1 includes a gateway transmitting terminal G_TX and a gateway receiving terminal G_RX, which are used to connect the intelligent gateway; the first resistor R1 is a current limiting resistor, which is used to protect the switch tube Q1 from overcurrent damage; the second resistor R2 is a pull-up resistor, which is used to connect the third end of the switch tube Q1 to the power supply. For the gateway transceiver unit 1, when the gateway transmitting terminal G_TX of the first wiring terminal J1 is at a low level, the switch tube Q1 is turned off, and the second resistor R2 provides a high level to the receiving enable terminal RE and the driving enable terminal DE of the transceiver U1 through the power supply, and enters the sending state; when the gateway transmitting terminal G_TX of the first wiring terminal J1 is at a high level, the switch tube Q1 is turned on, and the receiving enable terminal RE and the driving enable terminal DE of the transceiver U1 are pulled down to a low level through the switch tube Q1, and enter the receiving state.

[0030] The circuit breaker transceiver unit 2 of this embodiment mainly includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a diode array DA1 and a second terminal J2; wherein the second terminal J2 includes a differential bus positive terminal A and a differential bus negative terminal B, which are used to connect the intelligent circuit breaker; the third resistor R3 and the fourth resistor R4 are used to adjust the characteristic impedance of the differential bus and reduce the signal echo reflection to ensure the transmission quality of the signal on the differential bus; the fifth resistor R5 is a pull-up resistor, which is used to connect the differential bus positive terminal A to the power supply VCC; the sixth resistor R6 is a pull-down resistor, which is used to connect the differential bus negative terminal B to the ground GND, so that the reference level of the communication interface circuit produces a more stable potential, thereby improving the stability and reliability of the signal; the diode array DA1 can be composed of multiple diodes, or it can be a diode array chip. It can be understood that the circuit breaker transceiver unit 2 of this embodiment adds a diode array between the positive end A of the differential bus and the ground, and between the negative end B of the differential bus and the ground. When the amplitude of the electrical fast pulse group interference voltage coupled to the differential bus is high, the interference voltage will be clamped by the diode array, thereby achieving the purpose of protecting the transceiver U1.

[0031] For the communication interface circuit of this embodiment, when sending data, the gateway sending end G_TX of the first terminal J1 receives the TX signal. When the TX signal is at a high level, the positive and negative ends of the differential bus of the transceiver U1 will transmit a high level. When the TX signal is at a low level, the positive and negative ends of the differential bus of the transceiver U1 will transmit a low level, that is, the TX signal is converted into a differential signal by the transceiver U1 and connected to the differential bus through the second terminal J2; when receiving data, the gateway sending end G_TX of the first terminal J1 is always in a high level state, the switch tube Q1 is turned on, and the second terminal J2 obtains the differential signal on the differential bus, which is converted into a TTL signal by the transceiver U1 and transmitted to the intelligent gateway through the gateway receiving end G_RX of the first terminal J1.

[0032] In summary, the communication interface circuit of this embodiment has the following beneficial effects:

[0033] 1) The communication interface circuit of this embodiment can realize communication between the intelligent gateway and the intelligent circuit breaker through the transceiver U1, and expand the physical length of the differential bus and the number of connected intelligent circuit breakers;

[0034] 2) The communication interface circuit of this embodiment can realize the purpose of automatic data transmission and reception by setting a switch tube in the gateway transceiver unit 1;

[0035] 3) The communication interface circuit of this embodiment improves the anti-interference capability by providing a diode array DA1 in the circuit breaker transceiver unit 2;

[0036] 4) The communication interface circuit of this embodiment has a simple structure, low cost, and is easy to implement and maintain.

[0037] In an optional embodiment, the switch tube Q1 is an NPN transistor or an N-type MOS tube.

[0038] More specifically, Figure 1 As shown, when the switch tube Q1 is an NPN transistor, the first end of the switch tube Q1 is the base of the NPN transistor, the second end of the switch tube Q1 is the emitter of the NPN transistor, and the third end of the switch tube Q1 is the collector of the NPN transistor.

[0039] like Figure 2 As shown, when the switch tube Q1 is an N-type MOS tube, the first end of the switch tube Q1 is the gate of the N-type MOS tube, the second end of the switch tube Q1 is the source of the N-type MOS tube, and the third end of the switch tube Q1 is the drain of the N-type MOS tube.

[0040] It is understandable that in this embodiment, an NPN transistor or an N-type MOS transistor is applied to the gateway transceiver unit 1 to control the receiving enable terminal and the driving enable terminal of the transceiver U1, thereby realizing automatic switching between the receiving state and the sending state.

[0041] In a preferred embodiment, the diode array DA1 can be composed of multiple diodes. In this case, the diode array DA1 includes a first TVS tube, a second TVS tube, a third TVS tube and a fourth TVS tube. The cathode of the first TVS tube is the first end of the diode array, the cathode of the third TVS tube is the second end of the diode array, the anode of the first TVS tube is connected to the anode of the second TVS tube, the anode of the third TVS tube is connected to the anode of the fourth TVS tube, and the cathode of the second TVS tube is connected to the cathode of the fourth TVS tube, and is the third end of the diode array.

[0042] It can be understood that in this embodiment, the positive terminal A of the differential bus is connected to the ground through the first TVS tube and the second TVS tube, and the negative terminal B of the differential bus is connected to the ground through the third TVS tube and the fourth TVS tube, which can clamp the interference voltage coupled to the differential bus to achieve the purpose of protecting the transceiver U1.

[0043] In another preferred embodiment, the diode array DA1 may be a diode array chip. In this case, the model of the diode array DA1 is SM712.

[0044] It is understandable that in this embodiment, the SM712 is applied to the circuit breaker transceiver unit 2, which can further simplify the overall circuit structure while protecting the transceiver U1.

[0045] In a preferred embodiment, the gateway transceiver unit further includes a seventh resistor R7; the seventh resistor R7 is connected in series between the gateway receiving end G_RX of the first wiring terminal J1 and the receiving output end RO of the transceiver U1.

[0046] It is understandable that in the gateway transceiver unit 1 of this embodiment, the seventh resistor R7 is connected in series between the gateway receiving end G_RX of the first wiring terminal J1 and the receiving output end RO of the transceiver U1, which can prevent the transceiver U1 from being damaged due to overcurrent.

[0047] In addition, the utility model provides a gateway and circuit breaker communication system, referring to Figure 3 In one embodiment, the gateway and circuit breaker communication system includes an intelligent gateway, an intelligent circuit breaker and the communication interface circuit described in any of the above embodiments; the gateway device is connected to the circuit breaker through the communication interface circuit.

[0048] It can be understood that the gateway and circuit breaker communication system of this embodiment includes an intelligent circuit breaker, and several intelligent circuit breakers connected to the intelligent circuit breaker through a communication interface circuit. For the intelligent circuit breaker, various sensor modules are integrated inside, including: current transformer, leakage transformer and temperature sensor, etc. For the intelligent circuit breaker, the number is set according to demand, and the first end A of each intelligent circuit breaker is connected to the differential bus positive end C_A of the communication interface circuit, and the second end B of each intelligent circuit breaker is connected to the differential bus negative end C_B of the communication interface circuit. For the communication interface circuit, it can connect up to 32 intelligent circuit breakers.

[0049] In this embodiment, the intelligent gateway communicates with multiple circuit breakers through a communication interface circuit, and can collect switch status data, current data, voltage data and protection function parameter information, control the switch status of the intelligent circuit breaker according to the switch status data, current data, voltage data and protection function parameter information, and generate additional protection according to the switch status data, power quality data and protection function parameter information, so as to realize basic protection functions and additional protection functions.

[0050] In summary, the gateway and circuit breaker communication system of this embodiment sets a communication interface circuit between the intelligent gateway and the intelligent circuit breaker, which can connect multiple intelligent circuit breakers together, expand the physical length and number of nodes of the differential bus, and thus improve the communication capability and reliability of the gateway and circuit breaker communication system.

[0051] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A communication interface circuit, characterized in that: including a transceiver, a gateway transceiver unit and a circuit breaker transceiver unit; The gateway transceiver unit includes a first wiring terminal, a first resistor, a second resistor and a switch tube; the gateway transmitting end of the first wiring terminal is connected to the first end of the switch tube through the first resistor, the second end of the switch tube is grounded, the third end of the switch tube is simultaneously connected to the receiving enable end of the transceiver, the driving enable end of the transceiver and the first end of the second resistor, the second end of the second resistor is connected to the power supply, and the gateway receiving end of the first wiring terminal is connected to the receiving output end of the transceiver; The circuit breaker transceiver unit includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a diode array and a second terminal; the first end of the third resistor is connected to the negative terminal of the differential signal of the transceiver, the second end of the third resistor is grounded through the sixth resistor, and is respectively connected to the first end of the diode array and the negative terminal of the differential bus of the second terminal; the first end of the fourth resistor is connected to the positive terminal of the differential signal of the transceiver, the second end of the fourth resistor is connected to the power supply through the fifth resistor, and is respectively connected to the second end of the diode array and the positive terminal of the differential bus of the second terminal; the third end of the diode array is grounded.

2. The communication interface circuit according to claim 1, characterized in that: The switch tube is an NPN transistor or an N-type MOS tube.

3. The communication interface circuit according to claim 2, characterized in that: The diode array includes a first TVS tube, a second TVS tube, a third TVS tube and a fourth TVS tube, the cathode of the first TVS tube is the first end of the diode array, the cathode of the third TVS tube is the second end of the diode array, the anode of the first TVS tube is connected to the anode of the second TVS tube, the anode of the third TVS tube is connected to the anode of the fourth TVS tube, and the cathode of the second TVS tube is connected to the cathode of the fourth TVS tube and is the third end of the diode array.

4. The communication interface circuit according to claim 2, characterized in that: The model of the diode array is SM712.

5. The communication interface circuit according to claim 3 or 4, characterized in that: The gateway transceiver unit further includes a seventh resistor; the seventh resistor is connected in series between the gateway receiving end of the first wiring terminal and the receiving output end of the transceiver.

6. The communication interface circuit according to claim 5, characterized in that: The transceiver is an RS485 transceiver.

7. The communication interface circuit according to claim 6, characterized in that: The power supply is a 5V DC power supply.

8. A gateway and circuit breaker communication system, characterized in that: It comprises an intelligent gateway, an intelligent circuit breaker and a communication interface circuit as described in any one of claims 1 to 7; the intelligent gateway is connected to the intelligent circuit breaker through the communication interface circuit.

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