Multi-loop metering device

Abstract

The utility model provides a multi-loop metering device, which comprises a plurality of groups of live wire control modules, a metering module, a single-chip microcomputer and a communication module connected with the single-chip microcomputer and used for communicating with a computer, the structures of the multiple sets of live wire control modules are the same, each set of live wire control module comprises a live wire inlet terminal, a live wire outlet terminal, a control switch, a current sampling module and a voltage sampling module, the live wire inlet terminal is connected with the first end of the control switch, and the second end of the control switch is connected with the live wire outlet terminal; the control end of the control switch is connected with the single-chip microcomputer, the input end of the current sampling module is connected with a live wire inlet terminal, the input end of the voltage sampling module is connected with a live wire outlet terminal, and the output end of the current sampling module and the output end of the voltage sampling module are respectively connected with the input end of the metering module. The output end of the metering module is connected with the single-chip microcomputer.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a multi-circuit metering device in the technical field of vehicles. Background Art

[0002] In the vast end-use circuits of electricity consumption, loop control terminals are needed to control the opening and closing of circuits to provide power to various types of equipment. Examples include home lighting, city streetlights, and various electrical devices. Loop controllers at the end-use circuits have the following characteristics: large numbers, price sensitivity, low current, and the need to support manual control to disconnect electrical connections. my country strives to achieve carbon peak by 2030 and carbon neutrality by 2060, necessitating electricity conservation, especially for wide-area end-use equipment. Electricity consumption must be based on demand, and waste must be eliminated. The energy consumption of each branch circuit must be counted to make the energy consumption of each branch quantifiable and controllable.

[0003] Common multi-circuit control terminals (control current <20A) on the market currently fall into two main technology approaches. 1) The traditional approach integrates multiple manual switches on a single control panel, requiring manual opening and closing of the control circuits based on actual needs. 2) The IoT approach integrates metering and control on the control panel, but typically uses electronic buttons or remote control to control the circuits.

[0004] The "Multi-channel Intelligent Current Detection Relay and System," patent number 201721542488.6, integrates a manual switch, current measurement, and remote relay control. The use of a manual switch prevents safety incidents caused by remote control anomalies that could lead to lost access. However, the electrical quantities detected are limited, collecting only current signals, not voltage. This lacks energy consumption calculations for the circuits, and fails to detect important electrical safety indicators such as harmonics in the detected voltage and current. This makes it impossible to measure energy consumption within the circuits, nor to provide safety warnings for branch circuit equipment.

[0005] "A Power Multi-Channel Metering Control Device and Control Method," patent number 202033394U, dated November 9, 2011, leverages the Internet of Things (IoT) to integrate remote control and current and voltage measurement. This device addresses the need for centralized multi-channel control at the end-user, achieving per-channel metering and energy consumption statistics. However, the lack of a local manual switch can lead to unexpected network and device control anomalies in real-world applications. This prevents users from locally controlling the power supply to a branch circuit, potentially causing electrical safety incidents. Utility Model Content

[0006] This utility model provides a multi-circuit metering device that solves the problems of existing technologies that detect too few electrical quantities, only collect current signals but not voltage, lack energy consumption calculations for the circuits, and fail to detect important electrical safety indicators such as harmonics in the detected voltage and current. This makes it impossible to measure energy consumption in the circuits and provide certain safety warnings for branch circuit equipment.

[0007] A multi-circuit metering device is provided, comprising: multiple groups of live wire control modules, metering modules, and single-chip microcomputers, and a communication module connected to the single-chip microcomputer and used for communicating with a computer;

[0008] The structures of multiple groups of live wire control modules are the same. Each group of live wire control modules includes a live wire input terminal, a live wire output terminal, a control switch, a current sampling module and a voltage sampling module. The live wire input terminal is connected to the first end of the control switch, the second end of the control switch is connected to the live wire output terminal, the control end of the control switch is connected to the single-chip microcomputer, the input end of the current sampling module is connected to the live wire input terminal, the input end of the voltage sampling module is connected to the live wire output terminal, the output end of the current sampling module and the output end of the voltage sampling module are respectively connected to the input end of the metering module, and the output end of the metering module is connected to the single-chip microcomputer.

[0009] In the above solution, optionally, the metering module includes a plurality of metering units;

[0010] One metering unit corresponds to three different groups of firewire control modules. Each group of firewire control modules is connected to the input end of one metering unit, and the output end of the metering unit is connected to the single chip microcomputer.

[0011] In the above solution, optionally, the metering unit includes an RN7302 three-phase electrical parameter acquisition chip.

[0012] In the above solution, optionally, the current sampling module includes a current transformer;

[0013] The current transformer is sleeved on the live wire incoming terminal, and the output end of the current transformer is connected to the input end of the metering unit corresponding to the live wire control module.

[0014] In the above solution, optionally, the current transformer is a DC / T 1005 current transformer.

[0015] In the above solution, optionally, the voltage sampling module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor connected in series in sequence;

[0016] One end of the first resistor is connected to the live wire input terminal, and the connection ends of the fifth resistor and the sixth resistor, as well as the connection ends of the sixth resistor and the seventh resistor are all connected to the input end of the metering unit corresponding to the live wire control module.

[0017] In the above solution, optionally, the control switch includes a Darlington transistor array drive switch.

[0018] In the above solution, optionally, the communication module includes an RS485 communication module, one end of the RS485 communication module is connected to the single-chip microcomputer, and the other end of the RS485 communication module is connected to the computer.

[0019] In the above solution, optionally, the device further includes a power supply and a power conversion module;

[0020] The power supply is a 12V power supply, and the power conversion module includes a 12V to 5V voltage module and a 5V to 3.3V voltage module;

[0021] The input end of the 12V to 5V voltage module is connected to the power supply, the output end of the 12V to 5V voltage module is connected to the input end of the 5V to 3.3V voltage module, and the output end of the 5V to 3.3V voltage module is connected to the microcontroller.

[0022] In the above solution, optionally, the 12V to 5V voltage module includes a chip K7805-1000R3, and the 5V to 3.3V voltage module includes a chip REG1117-3.3. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 This is a circuit principle block diagram of a multi-circuit metering device provided by an embodiment of the utility model;

[0025] Figure 2 This is a circuit principle block diagram of another multi-circuit metering device provided by an embodiment of the present utility model;

[0026] Figure 3 This is a circuit diagram of the live wire incoming terminal and the control switch provided by the embodiment of the utility model;

[0027] Figure 4This is a circuit diagram of a metering unit provided in an embodiment of the present utility model;

[0028] Figure 5 This is a circuit schematic diagram of a voltage sampling module and a current sampling module provided by an embodiment of the present utility model;

[0029] Figure 6 This is a circuit diagram of a 12V to 5V voltage module provided by an embodiment of the present utility model;

[0030] Figure 7 This is a circuit diagram of a 5V to 3.3V voltage module provided by an embodiment of the present utility model;

[0031] Figure 8 The present invention provides a circuit diagram of an RS485 communication module. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0033] In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0034] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] In the description of the present invention, it should be understood that the terms "inside", "outside", "top", "bottom", "front", "back", etc., indicating directions or positional relationships (if any), are only used to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0037] The vehicle-mounted remote communication terminal provided by the embodiment of the utility model is explained in detail below.

[0038] This embodiment provides a multi-circuit metering device, comprising: multiple sets of live wire control modules 100, metering modules 200, and a single-chip microcomputer 300, and a communication module 400 connected to the single-chip microcomputer 300 and used to communicate with a computer 500;

[0039] The structures of multiple groups of live wire control modules 100 are the same. Each group of live wire control modules 100 includes a live wire input terminal 101, a live wire output terminal 102, a control switch 103, a current sampling module 104 and a voltage sampling module 105. The live wire input terminal 101 is connected to a first end of the control switch 103, a second end of the control switch 103 is connected to the live wire output terminal 102, a control end of the control switch 103 is connected to the single-chip microcomputer 300, an input end of the current sampling module 104 is connected to the live wire input terminal 101, an input end of the voltage sampling module 105 is connected to the live wire output terminal 102, an output end of the current sampling module 104 and an output end of the voltage sampling module 105 are respectively connected to the input end of the metering module 200, and an output end of the metering module 200 is connected to the single-chip microcomputer 300.

[0040] It should be noted that this application supports both local manual switching to forcibly open and close electrical circuits and independent metering of each circuit; voltage and current accuracy is 0.5, and energy metering meets level 1.0; and externally uses 485 communication to support communication with other devices, enabling remote control or reading of voltage, current, power, energy, and switch status for each circuit. This not only meets the requirements of local opening and closing in actual scenarios, ensuring electricity safety, but also incorporates metering for each circuit, enabling quantifiable and remotely controllable energy consumption.

[0041] like Figure 2 As shown, in this embodiment of the present application, the multiple groups of live wire control modules 100 are preferably eight groups. L1-IN of each group of live wire control modules 100 is the incoming live wire terminal, and L1-OUT is the outgoing live wire terminal. Similarly, there are eight terminals in total. The neutral line is placed at the end. Eight independent control circuits support access to either single-phase or three-phase power circuits.

[0042] In the embodiment of the present application, a control switch 103 is connected in series to each incoming line Lx-IN. Each control switch 103 controls the opening and closing of the electrical circuit; it is used for local control and forced opening and closing to ensure power safety. Each control switch 103 has a pin directly connected to the microcontroller 300, and the microcontroller 300 can control the opening and closing status of the control switch 103 through the pin.

[0043] In this embodiment, a current sampling module 104 is used after the control switch 103. This current sampling module 104 is a current transformer (CT). After the live wire passes through the CT and returns to the Lx-OUT terminal, it converts the high current on the live wire into a low current. This low current is then converted into a voltage and sent to the metering unit. This not only measures the high current but also electrically isolates the thermal power current from the measured current, protecting the low-voltage DC circuit from the impact of the high thermal power current.

[0044] In this embodiment of the present application, a voltage sample is obtained on Lx-OUT using a resistor divider. Five 1.5MΩ resistors and two 1kΩ resistors are used for voltage division. The voltage on the two 1kΩ resistors is obtained as the sample voltage of the live wire, and the sample voltage is finally connected to the metering unit.

[0045] In this embodiment, the metering module 200 includes a plurality of metering units;

[0046] One metering unit corresponds to three different groups of the FireWire control modules 100 . Each group of the FireWire control modules 100 is connected to the input end of one metering unit, and the output end of the metering unit is connected to the single chip microcomputer 300 .

[0047] In this embodiment, the metering unit includes an RN7302 three-phase electrical parameter acquisition chip.

[0048] In this embodiment, the metering unit uses the domestically produced RN7302 energy chip for measurement. This chip supports simultaneous sampling and measurement of three voltages and three currents. Therefore, the current and voltage sampling of lines L1 to L3 are connected to the metering chip RN7302-1, the current and voltage sampling of lines L4 to L6 are connected to the metering chip RN7302-2, and the current and voltage sampling of lines L7 to L8 are connected to the metering chip RN7302-3.

[0049] In this embodiment of the present application, the three metering units communicate with the microcontroller using three SPI ports. The microcontroller reads data from the three power chips through the SPI ports, thereby obtaining metering parameters such as voltage, current, power, and energy of channels L1 to L8.

[0050] like Figure 4 As shown, L-IN1 and L_OUT1 are connected in series Figure 2 The live wire of the live wire control module 100 obtains a large current from the live wire. The large current generates a sampling current after passing through the current transformer CT. The sampling current is converted into a voltage through a resistor and directly enters the metering chip.

[0051] In this embodiment, the current sampling module 104 includes a current transformer;

[0052] The current transformer is mounted on the live wire incoming terminal 101 , and the output end of the current transformer is connected to the input end of the metering unit corresponding to the live wire control module 100 .

[0053] In this embodiment, the current transformer is a DC / T 1005 current transformer.

[0054] In this embodiment, the voltage sampling module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor connected in series in sequence; one end of the first resistor is connected to the live wire input terminal, and the connection end of the fifth resistor and the sixth resistor, as well as the connection end of the sixth resistor and the seventh resistor are both connected to the input end of the metering unit corresponding to the live wire control module.

[0055] like Figure 5As shown, the first resistor (R83), the second resistor (R84), the third resistor (R85), the fourth resistor (R91) and the fifth resistor (R92) are all 1.5MΩ resistors, and the sixth resistor (R93) and the seventh resistor (R106) are both 1kΩ resistors. Five 1.5MΩ resistors + two 1kΩ resistors are connected in series to the live wire and the neutral wire to form a weak current loop. The voltage across the two 1kΩ resistors is directly connected to the voltage loop measurement terminal of the metering chip, thereby realizing the function of measuring high voltage with small voltage.

[0056] like Figure 5 As shown, this application uses 5 1.5MΩ + 2 1k resistors to divide the voltage, directly converting the voltage on the measured live line into a small sampling voltage, and then directly connecting it to the power chip.

[0057] In this embodiment, the control switch 103 includes a Darlington transistor array drive switch.

[0058] In the embodiment of the present application, the single chip microcomputer can control the corresponding 8-way control switches 103 through 8-way control pins respectively. The 8-way switch supports local manual control of opening and closing and automatic control of opening and closing by the single chip microcomputer.

[0059] like Figure 3 As shown, Figure 3 The system includes four control switches from the live wire control module 100. T9, T11, T13, and T16 are all control switches that can be used to control the opening and closing states of the electrical circuits via local manual switches. Remote control via a microcontroller is also supported. The control switch pins relayed from the microcontroller drive the opening and closing of the switches through a Darlington diode array, and a current transformer is connected in series on the power line. The SOP-18 relay driver chip enables the microcontroller to directly drive high-power switching devices.

[0060] In this embodiment, the communication module 400 includes an RS485 communication module 400 , one end of the RS485 communication module 400 is connected to the single chip microcomputer 300 , and the other end of the RS485 communication module 400 is connected to the computer 500 .

[0061] In the embodiment of the present application, the single chip microcomputer has one 485 channel, which is responsible for external communication, supports other devices to read electrical data such as voltage, current, power, and electricity through 485, and also supports 485 to control the opening and closing of the switch.

[0062] like Figure 8 As shown, the RS485 communication module adopts the SY8089AAC chip solution.

[0063] In this embodiment, the device further includes a power supply and a power conversion module;

[0064] The power supply is a 12V power supply, and the power conversion module includes a 12V to 5V voltage module and a 5V to 3.3V voltage module;

[0065] The input end of the 12V to 5V voltage module is connected to the power supply, the output end of the 12V to 5V voltage module is connected to the input end of the 5V to 3.3V voltage module, and the output end of the 5V to 3.3V voltage module is connected to the microcontroller 300.

[0066] In the embodiment of the present application, considering that the small size makes installation more convenient, 12VDC power supply is adopted.

[0067] In this embodiment, the 12V to 5V voltage module includes a chip K7805-1000R3, and the 5V to 3.3V voltage module includes a chip REG1117-3.3.

[0068] like Figure 6 As shown, Figure 6 This is the schematic diagram of the 12V to 5V voltage module. The 12V to 5V voltage module converts the 12V output of the 12V power supply into 5V to power the control switch.

[0069] like Figure 7 As shown, Figure 6 This is the schematic diagram of the 5V to 3.3V voltage module. The 5V to 3.3V voltage module converts 5V to 3.3V, and 3.3V provides power for peripherals such as microcontrollers, metering chips, and 485.

[0070] In the embodiments of the present application, the present application solves the problem that traditional multi-circuit controllers lack measurement of voltage, current, power, and electricity data, and cannot accurately know the power usage and energy consumption of each circuit, thereby realizing digital monitoring of each electrical circuit and achieving quantifiable results; at the same time, it solves the common problem of intelligent circuit control interruption on the market and the inability to open and close the circuit locally, and avoids the situation where the equipment does not respond to control instructions in the case of remote communication or abnormal operation of the equipment, resulting in failure of opening and closing, which may lead to safety accidents such as electric shock.

[0071] In the embodiment of the present application, the present application supports both remote control and local manual control, providing double insurance to ensure the safety of electricity use in each branch circuit; and the present application has a highly integrated function, which can realize independent electrical quantity monitoring and electricity metering of 8 circuits on one control circuit terminal, and achieve a voltage, current and power accuracy of 0.5 level, and a power consumption accuracy of 1 level. In addition, the present application also has the function of using switches to support local manual control and remote control. And the local manual control is not affected by the electronic part and is a traditional manual connection switch. This solution can completely eliminate the inability to respond to opening and closing due to abnormalities in the electronic part or the executing relay. This solution can use a manual switch to achieve independent opening and closing control functions.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-circuit metering device, characterized in that: The device comprises: a plurality of fire line control modules (100), a metering module (200) and a single chip computer (300), and a communication module (400) connected to the single chip computer (300) and used for communicating with a computer (500); The multiple groups of live wire control modules (100) have the same structure. Each group of live wire control modules (100) comprises a live wire input terminal (101), a live wire output terminal (102), a control switch (103), a current sampling module (104) and a voltage sampling module (105). The live wire input terminal (101) is connected to a first end of the control switch (103), a second end of the control switch (103) is connected to the live wire output terminal (102), and the control switch (103) ) is connected to the single-chip computer (300), the input end of the current sampling module (104) is connected to the live wire input terminal (101), the input end of the voltage sampling module (105) is connected to the live wire output terminal (102), the output end of the current sampling module (104) and the output end of the voltage sampling module (105) are respectively connected to the input end of the metering module (200), and the output end of the metering module (200) is connected to the single-chip computer (300).

2. A multi-circuit metering device according to claim 1, characterized in that: The metering module (200) comprises a plurality of metering units; One metering unit corresponds to three different groups of fire control modules (100), each group of fire control modules (100) is connected to the input end of one metering unit, and the output end of the metering unit is connected to the single chip computer (300).

3. A multi-circuit metering device according to claim 2, characterized in that: The metering unit includes a RN7302 three-phase electrical parameter acquisition chip.

4. A multi-circuit metering device according to claim 2, characterized in that: The current sampling module (104) comprises a current transformer; The current transformer is sleeved on the live wire incoming terminal (101), and the output end of the current transformer is connected to the input end of the metering unit corresponding to the live wire control module (100).

5. A multi-circuit metering device according to claim 4, characterized in that: The current transformer is a DC / T1005 current transformer.

6. A multi-circuit metering device according to claim 2, characterized in that: The voltage sampling module (105) comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor which are connected in series in sequence; One end of the first resistor is connected to the live wire input terminal (101), and the connection ends of the fifth resistor and the sixth resistor, and the connection ends of the sixth resistor and the seventh resistor are all connected to the input end of the metering unit corresponding to the live wire control module (100).

7. A multi-circuit metering device according to claim 2, characterized in that: The control switch (103) comprises a Darlington transistor array drive switch.

8. A multi-circuit metering device according to claim 1, characterized in that: The communication module (400) comprises an RS485 communication module (400), one end of the RS485 communication module (400) is connected to the single-chip computer (300), and the other end of the RS485 communication module (400) is connected to the computer (500).

9. A multi-circuit metering device according to claim 1, characterized in that: The device also includes a power supply and a power conversion module; The power supply is a 12V power supply, and the power conversion module includes a 12V to 5V voltage module and a 5V to 3.3V voltage module; The input end of the 12V to 5V voltage module is connected to the power supply, the output end of the 12V to 5V voltage module is connected to the input end of the 5V to 3.3V voltage module, and the output end of the 5V to 3.3V voltage module is connected to the single chip computer (300).

10. A multi-circuit metering device according to claim 9, characterized in that: The 12V to 5V voltage module includes a chip K7805-1000R3, and the 5V to 3.3V voltage module includes a chip REG1117-3.3.

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