Main circuit controlled by urban lighting loop

Abstract

The utility model discloses a main circuit for urban lighting loop control, which comprises a power supply circuit, a main control circuit, an output circuit, an electric energy measuring circuit, an input detection circuit and a plurality of street lamp loops, the electric energy measuring circuit comprises a plurality of current transformers, and the current transformers are connected in series in the corresponding street lamp loops so as to collect the current of the street lamp loops; the input end of the input detection circuit is connected with an alternating current contactor in each street lamp loop; the input end of the output circuit is in communication connection with the main control circuit, the output circuit comprises a plurality of relays, the relays are in one-to-one correspondence with the street lamp loops, and the relays are connected in the corresponding street lamp loops in series. According to the scheme, the current data of each street lamp loop can be acquired in real time, and the on-off of each street lamp loop can be independently controlled, so that the problem of unnecessary waste of electric energy caused by simultaneous work of all street lamps is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting control, in particular to a main circuit for controlling a city lighting loop. Background Art

[0002] With the continuous development of new technologies such as 5G, big data, cloud computing, and artificial intelligence, the construction of smart cities has been accelerated, and digitalization has continuously empowered urban governance. To strengthen urban infrastructure construction and build livable, resilient, and smart cities, it is necessary to improve the level of urban intelligence, build a digital government, cultivate a digital society, improve the data management system and mechanism, create an integrated digital resource system, and promote governance model changes, method reshaping, and capacity improvement through full-domain digitalization. It is necessary to promote the intelligent development of urban lighting, establish and improve an intelligent control system that organically unifies functional lighting and landscape lighting, accelerate the integration and application of technologies such as big data and the Internet of Things in the urban lighting industry, and improve the intelligent control rate of street lights. Improving the efficiency of urban operations through digitalization and constantly solving practical problems in urban governance are important paths to improve the level of urban governance.

[0003] As an important part of urban governance, urban lighting is of great significance for ensuring the safety of people's night travel, improving the quality of the urban night environment, and improving the overall level of urban modernization. Urban lighting construction and management always adhere to the development concept of "the people build the city, and the city is for the people", and actively conform to the needs of citizens for a better life.

[0004] In the existing urban lighting system, a time-based switch control mode is generally adopted. In this control mode, regardless of whether the lights need to be turned on (off) or not, as long as the on (off) time is reached, the street lights of all circuits will be turned on (or off), and it is impossible to control the on and off of each street light individually, which will cause a large amount of waste of electricity and cause inconvenience to people's travel. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a main circuit for controlling urban lighting circuits which can obtain the current data of each street lamp circuit in real time and control the on and off of each street lamp circuit individually, so as to avoid all street lamps working at the same time and causing unnecessary waste of electric energy.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A main circuit for controlling a city lighting circuit, comprising a power supply circuit, a main control circuit, an output circuit, an electric energy measurement circuit, an input detection circuit and a plurality of street lamp circuits;

[0008] The power supply circuit is electrically connected to the main control circuit, the output circuit, the electric energy measurement circuit and the input detection circuit respectively to supply power to the main control circuit, the output circuit, the electric energy measurement circuit and the input detection circuit respectively;

[0009] The electric energy measurement circuit includes a plurality of current transformers, the plurality of current transformers correspond to the plurality of street lamp circuits one by one, and the current transformers are connected in series in the corresponding street lamp circuits to collect the current of the street lamp circuits, and the electric energy measurement circuit is communicatively connected with the main control circuit to send the collected current data of each street lamp circuit to the main control circuit;

[0010] The input end of the input detection circuit is connected to the AC contactor in each of the street lamp circuits, the output end of the input detection circuit is connected to the main control circuit for communication, and the input detection circuit is in an on state and sends a signal to the main control circuit when the AC contactor is turned on, and the input detection circuit is in an off state when the AC contactor is turned off;

[0011] The input end of the output circuit is communicatively connected with the main control circuit. The output circuit includes a plurality of relays. The plurality of relays correspond to the plurality of street light circuits one by one, and the relays are connected in series in the corresponding street light circuits.

[0012] When the main circuit of this scheme is working, the power supply circuit is responsible for supplying power to the main control circuit, the output circuit, the electric energy measurement circuit and the input detection circuit to ensure the normal operation of the main control circuit, the output circuit, the electric energy measurement circuit and the input detection circuit; during operation, the current transformer in the electric energy measurement circuit collects the current data of each street lamp circuit respectively, and sends the collected current data to each main control circuit. At the same time, the input detection circuit detects the on-off status of the AC contactor in each street lamp circuit, and sends the on-off status of the AC contactor in each street lamp circuit to the main control circuit. The main control circuit is responsible for collecting data from each street lamp circuit; when it is necessary to control each street lamp circuit, it can be done by controlling the open and closed states of each relay in the output circuit. When it is used specifically, the main control circuit sends a control signal to the output circuit, so that multiple relays in the output circuit are in an open or closed state according to the requirements of the control signal, thereby realizing the on-off control of each street lamp circuit. Therefore, the main circuit using this solution can obtain the current data of each street lamp circuit in real time, and can control the on and off of each street lamp circuit separately, so as to avoid all street lamps working at the same time, resulting in unnecessary waste of electric energy.

[0013] Preferably, the power supply circuit includes a UPS module, a power module and a MOS tube Q1, the power module is used to convert the AC power into 12V DC power, the input end of the power module is connected to the AC power, the output end of the power module is connected to the gate of the MOS tube Q1, the drain of the MOS tube Q1 is connected to the UPS module, when the gate voltage of the MOS tube Q1 is 0, the MOS tube Q1 is turned on, and when the gate voltage of the MOS tube Q1 is not 0, the MOS tube Q1 is turned off.

[0014] In this way, when the mains power is supplied normally, the power module outputs 12V DC, so that the gate voltage of the MOS tube Q1 is not 0, the MOS tube Q1 is turned off, and the power circuit uses the mains power to supply power to other circuits. When the mains power is cut off, the output voltage of the power module is 0, the gate voltage of the MOS tube Q1 is 0, the MOS tube Q1 is turned on, and the power circuit uses the UPS module to supply power to other circuits, thereby ensuring that the main circuit can work normally when the mains power is cut off.

[0015] Preferably, the power module is LHE40-20B12, the ACL interface of the LHE40-20B12 is connected to the mains through a fuse, the +VO interface of the LHE40-20B12 outputs 12V DC, the TRIM interface of the LHE40-20B12 is output through resistor R15, resistor R16 and diode D2 in sequence, and the anode of the diode D2 is connected to the resistor R16, and a resistor R17 is also connected between the resistor R15 and the resistor R16, and the other end of the resistor R17 is grounded, the MOS tube Q1 is a PMOS, the gate of the MOS tube Q1 is connected to the +VO interface of the LHE40-20B12, and the source of the MOS tube Q1 is connected to the cathode of the diode D2.

[0016] In this way, when the mains is normally supplied, the +VO interface of LHE40-20B12 outputs 12V DC to the gate of MOS tube Q1, and the TRIM interface of LHE40-20B12 outputs a signal to the source of MOS tube Q1 after passing through resistor R15, resistor R16 and diode D2 in sequence. At this time, MOS tube Q1 is in the off state, and the power supply circuit uses the mains to supply power to other circuits. When the mains is cut off, the +VO interface of LHE40-20B12 outputs 0V DC to the gate of MOS tube Q1, the gate voltage of MOS tube Q1 is 0, MOS tube Q1 is turned on, and the power supply circuit uses the UPS module to supply power to other circuits, thereby ensuring that the main circuit can work normally even when the mains is cut off.

[0017] Preferably, the electric energy measurement circuit includes a measurement chip and multiple current measurement input points, the input ends of the multiple current measurement input points are connected one-to-one with the multiple current transformers, and the output ends of the current measurement input points are connected to the measurement chip through current limiting resistors to transmit the current information collected by the current transformers to the measurement chip.

[0018] In this way, the current collected by the current sensor in each street lamp loop is input into the measurement chip through the current measurement input point, and the current limiting resistor can limit the current of the line, thereby realizing the collection of current data of each street lamp loop.

[0019] Preferably, the measuring chip is HT7017, the V1P pin and V1N pin of the HT7107 are connected to two ends of one current measurement input point through current limiting resistors R12 and R14 respectively, and the V2P pin of the HT7017 is connected to another current measurement input point through current limiting resistor R1.

[0020] Preferably, the electric energy measurement circuit also includes a voltage measurement input point, the input end of the voltage measurement input point is connected to the mains for collecting three-phase line voltages, the output end of the voltage measurement input point is connected to ground via resistors R3, R6, R5, R7, R8, R10, R9 and R11 in sequence, both ends of the resistor R11 are connected in parallel to capacitor C8, one end of the resistor R11 and capacitor C8 connected in parallel is grounded, and the other end is connected to the V3N pin of the HT7107, the electric energy measurement circuit also includes a resistor R13 and a capacitor C11, the resistor R13 and capacitor C11 are connected in parallel, and one end of the resistor R13 and capacitor C11 connected in parallel is connected to the V3P pin of the HT7107, and the other end is grounded.

[0021] In this way, by collecting the three-phase line voltage, data support can be provided for calculating the circuit power loss. At the same time, during measurement, voltage division is performed through resistors R3, R6, R5, R7, R8, R10, R9 and R11 to reduce the voltage to a range that can be measured by the measurement chip. At the same time, the voltage signal adopts differential input, which increases signal quality and improves measurement accuracy.

[0022] Preferably, the input detection circuit includes a contactor detection input point and a bidirectional photocoupler U2, the input end of the contactor detection input point is connected to the AC contactor, one of the interfaces of the output end of the contactor detection input point is connected to the anode of the light-emitting diode of the bidirectional photocoupler U2 through a resistor R18, the other interface of the output end of the contactor detection input point is connected to the cathode of the light-emitting diode of the bidirectional photocoupler U2, the transistor collector of the bidirectional photocoupler U2 outputs a signal to the main control circuit through a resistor R19, and the transistor emitter of the bidirectional photocoupler U2 is grounded.

[0023] In this way, the use of a bidirectional photocoupler can ensure that the bidirectional photocoupler has output in both the positive and negative cycles of the alternating current, without the need for additional circuits or algorithms to debug the waveform, thus simplifying program design.

[0024] Preferably, the main control circuit is communicatively connected with the electric energy measurement circuit, the input detection circuit and the output circuit via an RS485 bus. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attached Figure 1 This is a system block diagram of the main circuit of the urban lighting loop control of the utility model;

[0026] Attached Figure 2 It is a partial circuit diagram of the power supply circuit in the main circuit of the urban lighting loop control of the utility model;

[0027] Attached Figure 3 It is a partial circuit diagram of the electric energy measurement circuit in the main circuit of the urban lighting loop control of the utility model;

[0028] Attached Figure 4 This is a partial circuit diagram of the input detection circuit in the main circuit of the urban lighting loop control of the utility model. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0030] As attached Figure 1 As shown, a main circuit for controlling a city lighting circuit includes an Internet of Things platform, a power supply circuit, a main control circuit, an output circuit, an electric energy measurement circuit, an input detection circuit, and multiple street lamp circuits; the Internet of Things platform is connected to the main control circuit for bidirectional communication; wherein the power supply circuit, the main control circuit, the output circuit, the electric energy measurement circuit, and the input detection circuit constitute a lighting control module terminal which is arranged in a distribution box;

[0031] The power supply circuit is electrically connected to the main control circuit, the output circuit, the electric energy measurement circuit and the input detection circuit respectively to supply power to the main control circuit, the output circuit, the electric energy measurement circuit and the input detection circuit respectively;

[0032] The electric energy measurement circuit includes a plurality of current transformers, which correspond to a plurality of street lamp circuits one by one, and the current transformers are connected in series in the corresponding street lamp circuits to collect the current of the street lamp circuits, and the electric energy measurement circuit is communicatively connected with the main control circuit to send the collected current data of each street lamp circuit to the main control circuit;

[0033] The input end of the input detection circuit is connected to the AC contactor in each street lamp circuit, and the output end of the input detection circuit is connected to the main control circuit for communication. When the AC contactor is turned on, the input detection circuit is in an on state and sends a signal to the main control circuit. When the AC contactor is turned off, the input detection circuit is in an off state.

[0034] The input end of the output circuit is in communication connection with the main control circuit. The output circuit includes a plurality of relays. The plurality of relays correspond to a plurality of street light circuits one by one, and the relays are connected in series in the corresponding street light circuits.

[0035] When the main circuit of the present scheme is working, the power supply circuit is responsible for supplying power to the main control circuit, the output circuit, the electric energy measurement circuit and the input detection circuit to ensure the normal operation of the main control circuit, the output circuit, the electric energy measurement circuit and the input detection circuit; during operation, the current transformer in the electric energy measurement circuit collects the current data of each street lamp circuit respectively, and sends the collected current data to each main control circuit. At the same time, the input detection circuit detects the on-off status of the AC contactor in each street lamp circuit, and sends the on-off status of the AC contactor in each street lamp circuit to the main control circuit. The main control circuit is responsible for collecting the data of each street lamp circuit and transmitting the data to the Internet of Things platform. The Internet of Things platform can know the working status of each street lamp circuit based on the data; when it is necessary to control each street lamp circuit, it can be controlled by controlling the open and closed states of each relay in the output circuit. When it is used specifically, the Internet of Things platform sends a control signal to the main control circuit, and the main control circuit further sends a control signal to the output circuit, so that the multiple relays in the output circuit are in an open or closed state according to the requirements of the control signal, thereby realizing the on-off control of each street lamp circuit. Therefore, the main circuit using this solution can obtain the current data of each street lamp circuit in real time, and can control the on and off of each street lamp circuit separately, so as to avoid all street lamps working at the same time, resulting in unnecessary waste of electric energy.

[0036] As attached Figure 2As shown, in this embodiment, the power supply circuit includes a UPS module, a power module and a MOS tube Q1. The power module is used to convert the AC power into 12V DC power. The input end of the power module is connected to the AC power, the output end of the power module is connected to the gate of the MOS tube Q1, and the drain of the MOS tube Q1 is connected to the UPS module. When the gate voltage of the MOS tube Q1 is 0, the MOS tube Q1 is turned on. When the gate voltage of the MOS tube Q1 is not 0, the MOS tube Q1 is turned off.

[0037] In this way, when the mains power is supplied normally, the power module outputs 12V DC, so that the gate voltage of the MOS tube Q1 is not 0, the MOS tube Q1 is turned off, and the power circuit uses the mains power to supply power to other circuits. When the mains power is cut off, the output voltage of the power module is 0, the gate voltage of the MOS tube Q1 is 0, the MOS tube Q1 is turned on, and the power circuit uses the UPS module to supply power to other circuits, thereby ensuring that the main circuit can work normally when the mains power is cut off.

[0038] As attached Figure 2 As shown, in this embodiment, the power module is LHE40-20B12, the ACL interface of LHE40-20B12 is connected to the mains 220VAC through a fuse, the +VO interface of LHE40-20B12 outputs 12V DC, the TRIM interface of LHE40-20B12 is output through resistor R15, resistor R16 and diode D2 in sequence, and the anode of diode D2 is connected to resistor R16, and resistor R17 is also connected between resistor R15 and resistor R16, and the other end of resistor R17 is grounded, MOS tube Q1 is PMOS, the gate of MOS tube Q1 is connected to the +VO interface of LHE40-20B12, and the source of MOS tube Q1 is connected to the cathode of diode D2.

[0039] In this way, when the mains is normally supplied, the +VO interface of LHE40-20B12 outputs 12V DC to the gate of MOS tube Q1, and the TRIM interface of LHE40-20B12 outputs a signal to the source of MOS tube Q1 after passing through resistor R15, resistor R16 and diode D2 in sequence. At this time, MOS tube Q1 is in the off state, and the power supply circuit uses the mains to supply power to other circuits. When the mains is cut off, the +VO interface of LHE40-20B12 outputs 0V DC to the gate of MOS tube Q1, the gate voltage of MOS tube Q1 is 0, MOS tube Q1 is turned on, and the power supply circuit uses the UPS module to supply power to other circuits, thereby ensuring that the main circuit can work normally even when the mains is cut off.

[0040] As attached Figure 3As shown, in this embodiment, the electric energy measurement circuit includes a measurement chip and multiple current measurement input points, the input ends of the multiple current measurement input points are connected to the multiple current transformers in a one-to-one correspondence, and the output ends of the current measurement input points are connected to the measurement chip through a current limiting resistor to transmit the current information collected by the current transformer to the measurement chip.

[0041] In this way, the current collected by the current sensor in each street lamp loop is input into the measurement chip through the current measurement input point, and the current limiting resistor can limit the current of the line, thereby realizing the collection of current data of each street lamp loop.

[0042] As attached Figure 3 As shown, in this embodiment, the measuring chip is HT7017, the V1P pin and V1N pin of HT7107 are connected to the two ends of one current measurement input point through the current limiting resistor R12 and the current limiting resistor R14 respectively (CON3), and the V2P pin of HT7017 is connected to the other current measurement input point (CON1) through the current limiting resistor R1.

[0043] In this embodiment, the electric energy measurement circuit also includes a voltage measurement input point (CON2), the input end of the voltage measurement input point is connected to the mains, and is used to collect the three-phase line voltage. The output end of the voltage measurement input point is connected to ground after passing through resistor R3, resistor R6, resistor R5, resistor R7, resistor R8, resistor R10, resistor R9 and resistor R11 in sequence. The two ends of the resistor R11 are connected in parallel with the capacitor C8. One end of the resistor R11 and the capacitor C8 connected in parallel is grounded, and the other end is connected to the V3N pin of the HT7107. The electric energy measurement circuit also includes a resistor R13 and a capacitor C11. The resistor R13 and the capacitor C11 are connected in parallel, and one end of the resistor R13 and the capacitor C11 connected in parallel is connected to the V3P pin of the HT7107, and the other end is grounded.

[0044] In this way, by collecting the three-phase line voltage, data support can be provided for calculating the circuit power loss. At the same time, during measurement, voltage division is performed through resistors R3, R6, R5, R7, R8, R10, R9 and R11 to reduce the voltage to a range that can be measured by the measurement chip. At the same time, the voltage signal adopts differential input, which increases signal quality and improves measurement accuracy.

[0045] As attached Figure 4As shown, in this embodiment, the input detection circuit includes a contactor detection input point (CON2) and a bidirectional photocoupler U2, the input end of the contactor detection input point is connected to the AC contactor, one of the interfaces at the output end of the contactor detection input point is connected to the anode of the light-emitting diode of the bidirectional photocoupler U2 through a resistor R18, the other interface at the output end of the contactor detection input point is connected to the cathode of the light-emitting diode of the bidirectional photocoupler U2, the transistor collector of the bidirectional photocoupler U2 outputs a signal to the main control circuit through a resistor R19, and the transistor emitter of the bidirectional photocoupler U2 is grounded.

[0046] In this way, the use of the bidirectional photocoupler U2 can ensure that the bidirectional photocoupler has output in both the positive and negative cycles of the alternating current, without the need for additional circuits or algorithms to debug the waveform, thus simplifying program design.

[0047] In this embodiment, the main control circuit is communicatively connected with the electric energy measurement circuit, the input detection circuit and the output circuit via the RS485 bus.

[0048] In this embodiment, the main control circuit also includes an extended interface module, which is used as a reserved interface for subsequent extended control functions. The extended interface module uses an RS485 interface and collects data through a standard communication method. In this way, the extended interface module serves as a reserved interface for subsequent extended control functions, such as common temperature and humidity sensors, PM2.5 sensors, meteorological sensors, etc., which use a 485 interface and collect data through a standard communication method (such as ModbusRTU).

[0049] In this embodiment, the main control circuit also includes a control mode program module, which has multiple control mode programs built in. The control modes include a timing mode, an illumination mode, and an illumination timing combination mode. In this way, multiple control mode programs are built in the main control circuit, which can be specifically configured and selected through the Internet of Things platform.

[0050] In this embodiment, the main control circuit also includes a data storage module and a reserved storage card slot. The data storage module regularly stores the control strategy sent to the main control circuit by the Internet of Things platform. The reserved storage card slot can be used to expand the storage capacity of the main control circuit by installing a storage card. In this way, the data storage module can enable the main control circuit to autonomously control the switch of the street light circuit when the communication with the Internet of Things platform is lost, and at the same time, the data of the internal storage control strategy is not lost when the power is off, and the UPS module is used to ensure short-term abnormal power outages. Specifically, the main control circuit will regularly synchronize the control strategy of the most recent week from the Internet of Things platform and store it in the local database. When the main control circuit is offline from the Internet of Things platform, the main control circuit will continue to maintain the synchronization data to control the street light circuit. At the same time, the power supply circuit will automatically switch to the UPS module power supply mode to continue working when the power is off until the UPS module is exhausted. In addition, the reserved storage card slot on the main control circuit supports SD / TF cards, which can be expanded to 32GB at most, and the onboard EMMC 4GB is used to expand when special circumstances require the storage of longer data.

[0051] In this embodiment, a real-time clock and a button battery are provided in the main control circuit. The button battery is used to power the real-time clock, and the main control circuit is periodically synchronized with the IoT platform. In this way, the main control circuit has an automatic time calibration function to achieve clock synchronization with the IoT platform. It supports network NTP time calibration and built-in RTC clock time calibration, with a time error of ≤2S. Time error: error ≤±0.5s / d. The main control circuit uses built-in RTC clock (real-time clock) hardware and a button battery to ensure that the RTC clock does not lose power. After power failure, the built-in RTC clock maintains normal operation and self-running function. After the device loses connection with the platform, it can run independently according to the internal tasks.

[0052] In this embodiment, the main control circuit is connected to the Internet of Things platform for communication. The Internet of Things platform sends a control instruction to the main control circuit. The main control circuit converts the control instruction into an internal communication protocol and controls each street lamp circuit according to the control instruction to realize the remote control function of the street lamp circuit. In this way, the main control circuit supports 6-way isolation switch output, which can be used to control the AC contactor to realize the street lamp circuit control. The main control circuit communicates data with the Internet of Things platform, receives instructions, converts the instructions into an internal communication protocol, and realizes the circuit control by operating the control output board and only needs to control the circuit switch.

[0053] The main control circuit transmits the received data of each street light circuit to the IoT platform in real time, and the main control circuit will also receive the control instructions of the IoT platform, and collect the corresponding data according to the control instructions and report it to the IoT platform to realize the telemetry function of the street light circuit data; in this way, the main control circuit receives the instructions of the IoT platform to realize the remote collection of various monitoring data (electrical parameters, environmental parameters, etc.), and can collect the electrical parameter data of the power distribution facilities, the electric energy meter data, and the environmental sensor data in real time or regularly. On the one hand, the main control circuit will collect data in real time and report it, and at the same time, the main control circuit will also receive the instructions of the IoT platform, and immediately collect and report the data.

[0054] The main control circuit obtains the corresponding configuration parameters and query service instructions from the Internet of Things platform. The main control circuit performs parameter configuration according to the corresponding configuration parameter instructions, and sends the query data to the Internet of Things platform according to the query service instructions to realize remote parameter setting and query functions. In this way, the Internet of Things platform can remotely set and query control strategy parameters, data acquisition parameters (polling interval), equipment parameters (configuration parameters, communication parameters, alarm parameters, longitude and latitude parameters, clock parameters, equipment factory information, etc.), street light controller parameters, etc. The main control circuit can obtain the corresponding configuration parameters and query function services from the Internet of Things platform to realize remote setting and query functions.

[0055] The main control circuit periodically obtains the GPS location of the base station and sends it to the IoT platform.

[0056] In this embodiment, in the timing mode, the main control circuit uses the general strategy calendar to control the opening and closing of each street light circuit by default; in the illumination mode, the main control circuit obtains the illumination information from the Internet of Things platform in real time, and controls the opening and closing of each street light circuit according to the set range of illumination; in the illumination timing combination mode, the main control circuit obtains the illumination information from the Internet of Things platform in real time, and controls the opening and closing of each street light circuit in combination with the timing time in the strategy calendar.

[0057] In this embodiment, the main control circuit sends the abnormal fault condition to the IoT platform in real time when a fault occurs in the street lamp circuit. In this way, the main control circuit will report the abnormal fault condition and the switch operation to the IoT platform in a timely manner, which is convenient for the IoT platform to perform log management and control.

[0058] In this embodiment, the main control circuit supports remote and local firmware upgrades. On the one hand, the main control circuit supports remote upgrades by sending the latest firmware from the Internet of Things platform; it also supports local upgrades on the reserved hardware interface.

[0059] In this embodiment, the main control circuit supports wireless networks (2G / 3G / 4G / 5G) and wired networks (Ethernet communication). When designing the hardware of the main control circuit, the maximum communication expansion is considered, and the PCIE and M.2 interfaces are used. Accessing the universal communication module can facilitate the switching of 4G and 5G modules. At the same time, the main control circuit itself has 1 100M and 1 1000M network ports, which is convenient for debugging and docking with other devices and system data.

[0060] In the present invention, the MQTT protocol is used for communication between the lighting control module terminal and the Internet of Things platform.

[0061] The communication between the control module terminal and the Internet of Things platform of the utility model adopts the MQTT protocol. Compared with the current mainstream HTTP protocol, the MQTT protocol has the following advantages: more convenient application scenarios, more timely command response, more persistent communication links, higher network tolerance, and simpler programming models.

[0062] The utility model adopts a modular design in the control module terminal. By decomposing the functions of the light control module terminal, it can be configured on demand according to the needs of the application scenario, avoiding excessive waste and greatly saving the use cost.

[0063] Through design and development, the utility model studies the implementation methods of multiple functions such as terminal switch control, data collection, fault alarm, etc. of the lighting control module. According to the implementation requirements of each function, the corresponding communication content is determined, and through modular design, software debugging and other processes, a lightweight terminal product is produced to provide a more convenient and efficient control terminal for the distribution cabinet.

[0064] This utility model lighting control module terminal is a remote intelligent lighting circuit control terminal integrating remote control, remote signaling, telemetry and GPS functions. It uses MQTT protocol to communicate with the Internet of Things platform and is installed in the lighting distribution cabinet. It has functions such as circuit control, circuit current, circuit voltage, circuit power metering and environmental monitoring of street lamp circuits. The product adopts modular design and its functions can be expanded according to application scenarios in the future. The terminal centralized control board interface is reserved to realize the needs of single lamp control and meet the refined management of urban lighting. The 5G module installation interface is reserved to meet the low-latency management of urban lighting. The main control adopts ARM-A7 dual-core 1.2GHz high-performance processor to provide support for subsequent edge computing power.

[0065] The LHE40-20B12, HT7017, etc. used in this embodiment are all mature chips in the prior art. For the functions of the chips, you can refer to the relevant technical manuals for details. They will not affect the implementation of this solution or cause unclear problems in this solution, so they will not be described in detail in this solution.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the utility model without departing from the purpose and scope of the technical solution of the utility model should be included in the scope of the claims of the utility model.

Claims

1. A main circuit for controlling a city lighting loop, characterized in that: It includes power supply circuit, main control circuit, output circuit, electric energy measurement circuit, input detection circuit and multiple street lamp circuits; The power supply circuit is electrically connected to the main control circuit, the output circuit, the electric energy measurement circuit and the input detection circuit respectively to supply power to the main control circuit, the output circuit, the electric energy measurement circuit and the input detection circuit respectively; The electric energy measurement circuit includes a plurality of current transformers, the plurality of current transformers correspond to the plurality of street lamp circuits one by one, and the current transformers are connected in series in the corresponding street lamp circuits to collect the current of the street lamp circuits, and the electric energy measurement circuit is communicatively connected with the main control circuit to send the collected current data of each street lamp circuit to the main control circuit; The input end of the input detection circuit is connected to the AC contactor in each of the street lamp circuits, the output end of the input detection circuit is connected to the main control circuit for communication, and the input detection circuit is in an on state and sends a signal to the main control circuit when the AC contactor is turned on, and the input detection circuit is in an off state when the AC contactor is turned off; The input end of the output circuit is communicatively connected with the main control circuit. The output circuit includes a plurality of relays. The plurality of relays correspond to the plurality of street light circuits one by one, and the relays are connected in series in the corresponding street light circuits.

2. The main circuit for controlling the urban lighting loop according to claim 1 is characterized in that: The power supply circuit includes a UPS module, a power module and a MOS tube Q1. The power module is used to convert the mains power into 12V DC power. The input end of the power module is connected to the mains power, the output end of the power module is connected to the gate of the MOS tube Q1, and the drain of the MOS tube Q1 is connected to the UPS module. When the gate voltage of the MOS tube Q1 is 0, the MOS tube Q1 is turned on, and when the gate voltage of the MOS tube Q1 is not 0, the MOS tube Q1 is turned off.

3. The main circuit for controlling the urban lighting loop according to claim 2 is characterized in that: The power module is LHE40-20B12, the ACL interface of the LHE40-20B12 is connected to the mains through a fuse, the +VO interface of the LHE40-20B12 outputs 12V DC, the TRIM interface of the LHE40-20B12 is output through resistor R15, resistor R16 and diode D2 in sequence, and the anode of the diode D2 is connected to the resistor R16, and a resistor R17 is also connected between the resistor R15 and the resistor R16, and the other end of the resistor R17 is grounded, the MOS tube Q1 is a PMOS, the gate of the MOS tube Q1 is connected to the +VO interface of the LHE40-20B12, and the source of the MOS tube Q1 is connected to the cathode of the diode D2.

4. The main circuit for controlling the urban lighting loop according to claim 1 is characterized in that: The electric energy measurement circuit includes a measurement chip and multiple current measurement input points, the input ends of the multiple current measurement input points are connected to the multiple current transformers in a one-to-one correspondence, and the output ends of the current measurement input points are connected to the measurement chip through a current limiting resistor to transmit the current information collected by the current transformer to the measurement chip.

5. The main circuit for controlling the urban lighting loop according to claim 4 is characterized in that: The measuring chip is HT7017, the V1P pin and V1N pin of the HT7107 are connected to two ends of one current measurement input point through current limiting resistors R12 and R14 respectively, and the V2P pin of the HT7017 is connected to another current measurement input point through current limiting resistor R1.

6. The main circuit for controlling the urban lighting loop according to claim 5, characterized in that: The electric energy measurement circuit also includes a voltage measurement input point, the input end of the voltage measurement input point is connected to the mains for collecting three-phase line voltages, the output end of the voltage measurement input point is connected to ground after passing through resistors R3, R6, R5, R7, R8, R10, R9 and R11 in sequence, both ends of the resistor R11 are connected in parallel to capacitor C8, one end of the resistor R11 and capacitor C8 connected in parallel is grounded, and the other end is connected to the V3N pin of the HT7107, the electric energy measurement circuit also includes a resistor R13 and a capacitor C11, the resistor R13 and capacitor C11 are connected in parallel, and one end of the resistor R13 and capacitor C11 connected in parallel is connected to the V3P pin of the HT7107, and the other end is grounded.

7. The main circuit for controlling the urban lighting loop according to claim 1, characterized in that: The input detection circuit includes a contactor detection input point and a bidirectional photoelectric coupler U2, wherein the input end of the contactor detection input point is connected to the AC contactor, one of the interfaces of the output end of the contactor detection input point is connected to the anode of the light-emitting diode of the bidirectional photoelectric coupler U2 through a resistor R18, and the other interface of the output end of the contactor detection input point is connected to the cathode of the light-emitting diode of the bidirectional photoelectric coupler U2, the transistor collector of the bidirectional photoelectric coupler U2 outputs a signal to the main control circuit through a resistor R19, and the transistor emitter of the bidirectional photoelectric coupler U2 is grounded.

8. The main circuit for controlling the urban lighting loop according to claim 1, characterized in that: The main control circuit is connected to the electric energy measurement circuit, the input detection circuit and the output circuit through a RS485 bus.

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