A metering device capable of setting a remote power-off rejection function

Abstract

The present invention provides a metering device capable of being set to reject remote power-off, characterized in that it comprises: a communication unit A, a microprocessing unit D, and a relay unit G; the communication unit A is used to communicate with the master station system, upload device data, and process commands issued by the master station; the microprocessing unit D is connected to the communication unit A, and is used to run the control program, process metering data, detect and judge events, perform logical calculations, and execute commands; the relay unit G is used to perform switch control on the load end, and comprises a driving chip or a transistor module for controlling the relay to open and close, the driving chip or the transistor module is connected to the microprocessing unit D, and the metering device rejects the remote power-off function by controlling the power on and off of the driving chip or the transistor module. The designed relay unit system can set the metering device to the state of rejecting power-off, so that the metering device works in a special mode where the relay action cannot be controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary control of smart electric meters, and in particular to a metering device capable of refusing remote power-off. Background Art

[0002] With the widespread application of smart meter equipment, some special use scenarios are becoming more and more complex, and product updates require more innovative designs based on market demand. For metering devices in special places such as hospitals, stations, banks, and factories, it is necessary to meet the requirement that they cannot be remotely shut down under any conditions. Once a remote shutdown error occurs, it will cause irreparable losses. Therefore, in some scenarios, the metering devices for these special occasions should have the function of rejecting remote shutdown operations. However, the existing design method of smart energy meters, in its working environment, has no relevant design, and there is a risk that the smart meter will be remotely controlled by the system to shut down, affecting the power supply and power consumption at the device site, which has caused great trouble to customers. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the prior art that the metering device cannot refuse remote closing and closing operations, and when an erroneous operation occurs, it affects the power supply and power consumption at the device site, which is likely to cause irreparable losses.

[0004] To this end, the present invention provides a metering device that can be set to reject remote power-off.

[0005] The present invention provides a metering device capable of being set to reject remote power-off, comprising: a communication unit A, a microprocessing unit D, and a relay unit G;

[0006] The communication unit A is used to communicate with the master station system, upload device data and process commands issued by the master station;

[0007] The microprocessing unit D is connected to the communication unit A and is used to run the control program, process the metering data, detect and judge events, perform logical calculations and execute commands;

[0008] The relay unit G is used to control the switch of the load end, including a driving chip or transistor module for controlling the opening and closing of the relay. The driving chip or transistor module is connected to the microprocessor unit D. By controlling the power supply on and off of the driving chip or transistor module, the metering device can reject the remote switching function.

[0009] The present invention proposes a metering device that can be set to reject remote power-off. The communication module used by the communication unit A can be of 2G, 3G, LTE or NB type, and is a communication carrier for data communication and command execution; the microprocessor unit D is the core of the operation of the metering device system; the relay unit G is used to realize the function of rejecting remote power-off. In the normal working mode, the relay unit can open and close the switch through remote commands, and can also open and close the switch under the condition that the meter self-detection meets its opening and closing logic; in the special working mode, the relay unit can reject remote commands to open and close the switch.

[0010] A metering device capable of rejecting remote power-off according to the above technical solution of the present invention may also have the following additional technical features:

[0011] In the above technical solution, the relay unit includes a switch circuit G1, an isolation circuit G2, a detection circuit G3, a control circuit G4 and a drive circuit G5;

[0012] The switch circuit G1 is provided with a switch device, which is used to use the on-off state change of the switch device as an output signal and input it to the isolation circuit G2;

[0013] The isolation circuit G2 is connected to the detection circuit G3, and is used to isolate the switch circuit G1 from the detection circuit G3, and generate an output signal according to the switch device on-off state change signal and transmit it to the detection circuit G3;

[0014] The detection circuit G3 is connected to the microprocessing unit D and the control circuit G4 respectively, generates an output signal according to the level of the input signal, and sends the output signal to the microprocessing unit D and the control circuit G4 respectively, and the microprocessing unit D identifies the working mode of the metering device according to the level of the output signal;

[0015] The control circuit G4 is connected to the driving circuit G5, and controls the magnitude of the output voltage VCC3 according to the input signal level, and the output voltage VCC3 is used to power the driving circuit G5;

[0016] The driving circuit G5 includes a driving chip or a transistor module, which is connected to the microprocessing unit D. When the output voltage VCC3 of the control circuit G4 meets the threshold requirement, the microprocessing unit D can control the metering device to remotely open or close the switch through the driving chip or the transistor module; when the output voltage VCC3 of the control circuit G4 is 0V, the microprocessing unit D cannot control the metering device to remotely open or close the switch through the driving chip or the transistor module.

[0017] In this technical solution, the switching device in the switching circuit G1 can be directly turned on and off by manual operation or automatically. The switching circuit G1 uses the signal change of the switching device as the input signal of the entire relay unit. The input signal is isolated and processed by the isolation circuit G2 to reach the detection circuit G3 that needs to be isolated from the part in contact with the human body. The detection circuit G3 can detect the switching state of the external device to identify whether the relay unit is in a normal working mode or a special working mode, and convert the input signal to output it to the control circuit G4. The control circuit G4 controls the on and off of the components in the circuit according to the input signal, controls the voltage input to the relay unit G5, and thus controls whether the microprocessor unit D can use remote instructions to drive the relay unit to close or open the switch.

[0018] In the above technical solution, the switch circuit G1 includes: a switch device S1, a TVS tube D2, a thermistor R4 and a thermistor R18;

[0019] Two ends of the switch device S1 are connected to one end of the thermistor R4 and one end of the thermistor R18 respectively, and two ends of the TVS tube D2 are connected to the other end of the thermistor R4 and one end of the thermistor R18 respectively.

[0020] In this technical solution, when the input port or switch device S1 encounters a strong electric attack, the TVS tube D2 can effectively clamp the input voltage at a safe level, thereby protecting the back-end circuit and the central system of the meter. Under strong voltage, the thermistor R4 and thermistor R18 increase in resistance as the time / temperature acting on the PTC resistors R4 and R18 increases, thereby suppressing the loop current at a certain level to protect damage to the back-end circuit. The form of the switch device S1 includes but is not limited to toggle switches, push switches, and wireable terminals. The mode of operating the switch device S1 can be manual or automatic.

[0021] In the above technical solution, the isolation circuit G2 includes: a resistor R2, a photocoupler U1 and a resistor R13;

[0022] The power source VDD is connected to the input end of the primary light-emitting diode of the photocoupler U1 through the resistor R2, and the switch circuit is connected in series between the output end of the primary light-emitting diode of the photocoupler U1 and the ground;

[0023] The power source VCC1 is connected to the input end of the secondary photosensitive device of the photocoupler U1, and the output end of the secondary photosensitive device of the photocoupler U1 is connected to the detection circuit and grounded via the resistor R13.

[0024] In this technical solution, when the switch device S1 is turned on, that is, the signal input to the isolation circuit G2 is in a short-circuit state, the power supply VDD forms a conduction loop with the primary light-emitting tube of the photocoupler U1 through the resistor R2, the photocoupler U1 works in the conduction state, and the isolation circuit G2 outputs a high-level signal; when the switch device S1 is turned off, that is, the signal input to the isolation circuit G2 is in an open-circuit state, the primary light-emitting tube of the photocoupler U1 does not have a complete loop, the photocoupler U1 works in the cut-off state, and the isolation circuit G2 outputs a low-level signal.

[0025] In the above technical solution, the detection circuit G3 includes: a resistor R12, a transistor Q3 and a resistor R7;

[0026] The output terminal of the secondary photosensitive device of the photocoupler U1 is connected to the base of the transistor Q3 through the resistor R12;

[0027] The power source VCC1 is connected to the collector of the transistor Q3 via the resistor R7, and one input terminal of the microprocessing unit D is connected to the collector of the transistor Q3;

[0028] The emitter of transistor Q3 is connected to ground.

[0029] In this technical solution, when the signal input to the detection circuit G3 is a high level, the output signal of the detection circuit G3 is a low level signal, the low level signal is uploaded to the microprocessing unit D, the microprocessing unit D recognizes that the switch device S1 is in a closed state, and the metering device is in a special working mode; when the signal input to the detection circuit G3 is a low level, the output signal of the detection circuit G3 is a high level signal, the high level signal is uploaded to the microprocessing unit D, the microprocessing unit D recognizes that the switch device S1 is in a disconnected state, and the metering device is in a normal working mode.

[0030] In the above technical solution, the control circuit G4 includes: a resistor R1, a resistor R3, a resistor R4, a resistor R14, a transistor Q2 and a MOS tube Q1;

[0031] The collector of the transistor Q3 is connected to the base of the transistor Q2 via the resistor R14, the power source VCC2 is connected to the collector of the transistor Q2 via the resistor R1 and the resistor R4, and the emitter of the transistor Q2 is grounded;

[0032] One end of the resistor R3 is connected between the resistor R1 and the resistor R4, the other end of the resistor R3 is connected to the gate of the MOS transistor Q1, the drain of the MOS transistor Q1 is connected to the power supply VCC2, and the source of the MOS transistor Q1 is connected to the driving circuit G5.

[0033] In this technical solution, when the signal input to the control circuit G4 is at a high level, that is, when the collector output of the transistor Q3 is at a high level, the signal provides the base current of the transistor Q2 through the resistor R14, and the transistor Q2 works in the on state. VCC2 forms a current loop through the resistors R1, R4 and the transistor Q2. The resistors R1 and R4 form a voltage divider in the current loop, so that the voltage difference between the VGS of the MOS tube Q1 meets the on threshold, and the MOS tube Q1 works in the on state. The output voltage VCC3 of the control circuit G4 is theoretically equivalent to the voltage of the power supply VCC2.

[0034] When the signal input to the control circuit G4 is at a low level, that is, the collector output of the transistor Q3 is at a low level, the signal cannot provide the base current of the transistor Q2 through the resistor R14, and the transistor Q2 works in the cut-off state. The power supply VCC2 cannot form a current loop through the resistors R1, R4 and the transistor Q2. The resistors R1 and R4 do not form a voltage divider in the current loop, so that the voltage difference between the VGS of the MOS tube Q1 is 0, and the conduction threshold is not reached. The MOS tube Q1 works in the cut-off state, and the output voltage VCC3 of the control circuit G4 is 0V or close to 0V.

[0035] In the above technical solution, the driving circuit G5 includes a driving chip and a relay;

[0036] The source of the MOS tube Q1 is connected to the power input terminal of the driving chip, the control terminal of the driving chip is connected to the microprocessing unit D, and the output terminal of the driving chip is connected to a relay, which is used to realize the closing and closing of the metering device.

[0037] In this technical solution, when the output voltage VCC3 of the control circuit G4 is equal to or close to the voltage of the power supply VCC2, that is, the drive circuit G5 can obtain normal power supply, the microprocessing unit D can normally perform remote opening and closing commands on the relay through the drive chip, and the metering device is in normal working mode;

[0038] When the output voltage VCC3 of the control circuit G4 is 0V or close to 0V, that is, the power supply of the drive circuit G5 is physically disconnected, the microprocessor D cannot normally remotely open and close the relay through the drive chip, and the metering device is in a special working mode.

[0039] In any of the above technical solutions, it also includes a power supply unit C for supplying power to each unit inside the metering device.

[0040] In this technical solution, the power supply unit C is connected to the other units in the device, including but not limited to switching power supply, linear power supply and other design solutions. Specifically, a switching power supply design solution can be adopted, the device is used at a reduced rating, and a wide voltage range input is supported to ensure stable operation of the metering device.

[0041] In any of the above technical solutions, it also includes a display unit B for displaying electric energy metering data, relay status, metering device configuration parameters and alarm prompts.

[0042] In this technical solution, the display unit B includes display parts such as LED and LCD, which can display metering data, relay status, metering device configuration parameters, alarm prompts and other information, wherein the implementation methods of LCD include but are not limited to COG, COB, etc.

[0043] In any of the above technical solutions, it also includes a storage unit E for storing and backing up data and a metering unit F for collecting and calculating metering data.

[0044] In this technical solution, the storage unit E is responsible for storing the metering data, logs, event records and other data of the metering device; the metering unit F is responsible for the collection and processing of power grid signals, and completes the collection and calculation of metering data, mainly including the voltage, current, frequency, power factor, electric energy and other electric energy data of each corresponding metering unit F. The specific implementation methods include but are not limited to CT, manganese copper, Hall, and TMR.

[0045] In summary, due to the adoption of the above technical features, the beneficial effects of the present invention are:

[0046] The designed relay unit system can set the metering device to a state of refusing to switch off. The authorized personnel can control the switch device in the lead-sealed area and set the switch to a specific state, thereby turning off the power supply of the relay control circuit, achieving a complete physical disconnection in the circuit, and allowing the metering device to work in a special mode where the relay action cannot be controlled. The relevant circuit of the present invention is flexible, concise, safe and reliable, and provides an effective solution to meet the needs of flexible and reliable control of relays.

[0047] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0049] Figure 1 It is a circuit schematic diagram of a relay unit G in a metering device capable of rejecting remote power-off according to an embodiment of the present invention;

[0050] Figure 2 It is a module diagram of a relay unit G in a metering device capable of being set to reject remote power-off according to an embodiment of the present invention;

[0051] Figure 3It is a schematic diagram of a switch circuit G1 of a relay unit G in a metering device capable of being set to reject remote power-off according to an embodiment of the present invention;

[0052] Figure 4 It is a schematic diagram of an isolation circuit G2 of a relay unit G in a metering device capable of rejecting remote power-off according to an embodiment of the present invention;

[0053] Figure 5 It is a schematic diagram of a detection circuit G3 of a relay unit G in a metering device capable of being set to reject remote power-off according to an embodiment of the present invention;

[0054] Figure 6 It is a schematic diagram of a control circuit G4 of a relay unit G in a metering device capable of rejecting remote power-off according to an embodiment of the present invention;

[0055] Figure 7 It is a schematic diagram of a driving circuit G5 of a relay unit G in a metering device capable of rejecting remote power-off according to an embodiment of the present invention;

[0056] Figure 8 It is a functional architecture diagram of a metering device capable of rejecting remote power outage according to an embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0058] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0059] Refer to the following Figures 1 to 8 A metering device capable of rejecting remote power outage according to some embodiments of the present invention will be described.

[0060] Some embodiments of the present application provide a metering device that can be set to reject remote power outages.

[0061] like Figures 1 to 8 As shown, the first embodiment of the present invention proposes a metering device capable of being set to reject remote power-off, comprising: a communication unit A, a microprocessing unit D, and a relay unit G;

[0062] The communication unit A is used to communicate with the master station system, upload device data and process commands issued by the master station;

[0063] The microprocessing unit D is connected to the communication unit A and is used to run the control program, process the metering data, detect and judge events, perform logical calculations and execute commands;

[0064] The relay unit G is used to control the switch of the load end, including a driving chip or transistor module for controlling the opening and closing of the relay. The driving chip or transistor module is connected to the microprocessor unit D. By controlling the power supply on and off of the driving chip or transistor module, the metering device can reject the remote switching function.

[0065] The present embodiment proposes a metering device that can be set to reject remote power-off. The communication module used by the communication unit A can be of 2G, 3G, LTE or NB type, and is a communication carrier for data communication and command execution; the microprocessor unit D is the core of the operation of the metering device system; the relay unit G is used to realize the function of rejecting remote power-off. In the normal working mode, the relay unit can open and close the switch through remote commands, and can also open and close the switch under the condition that the meter self-detection meets its opening and closing logic; in the special working mode, the relay unit can reject remote commands to open and close the switch.

[0066] The second embodiment of the present invention provides a metering device that can be set to reject remote power-off, and based on the first embodiment, Figures 1 to 8 As shown, the relay unit includes a switch circuit G1, an isolation circuit G2, a detection circuit G3, a control circuit G4 and a drive circuit G5;

[0067] The switch circuit G1 is provided with a switch device, which is used to use the on-off state change of the switch device as an output signal and input it to the isolation circuit G2;

[0068] The isolation circuit G2 is connected to the detection circuit G3, and is used to isolate the switch circuit G1 from the detection circuit G3, and generate an output signal according to the switch device on-off state change signal and transmit it to the detection circuit G3;

[0069] The detection circuit G3 is connected to the microprocessing unit D and the control circuit G4 respectively, generates an output signal according to the level of the input signal, and sends the output signal to the microprocessing unit D and the control circuit G4 respectively, and the microprocessing unit D identifies the working mode of the metering device according to the level of the output signal;

[0070] The control circuit G4 is connected to the driving circuit G5, and controls the magnitude of the output voltage VCC3 according to the input signal level, and the output voltage VCC3 is used to power the driving circuit G5;

[0071] The driving circuit G5 includes a driving chip or a transistor module, which is connected to the microprocessing unit D. When the output voltage VCC3 of the control circuit G4 meets the threshold requirement, the microprocessing unit D can control the metering device to remotely open or close the switch through the driving chip or the transistor module; when the output voltage VCC3 of the control circuit G4 is 0V, the microprocessing unit D cannot control the metering device to remotely open or close the switch through the driving chip or the transistor module.

[0072] In this embodiment, the switching device in the switching circuit G1 can be directly turned on and off by manual operation or automatically. The switching circuit G1 uses the signal change of the switching device as the input signal of the entire relay unit. The input signal is isolated and processed by the isolation circuit G2 to reach the detection circuit G3 that needs to be isolated from the part in contact with the human body. The detection circuit G3 can detect the switching state of the external device to identify whether the relay unit is in a normal working mode or a special working mode, and convert the input signal to output it to the control circuit G4. The control circuit G4 controls the on and off of the components in the circuit according to the input signal, controls the voltage input to the relay unit G5, and thus controls whether the microprocessor unit D can use remote instructions to drive the relay unit to close or open the switch.

[0073] In some implementations, the isolation circuit G2 may be connected to the detection circuit G3 and the control circuit G4 respectively, and the output signal of the isolation circuit G2 may be directly used as the input signal of the control circuit G4. The detection circuit G3 is only used to detect the working state of the metering device. When specifically connected, the output end of the secondary photosensor of the photocoupler U1 may be connected to the base of the transistor Q2 through the resistor R14.

[0074] The third embodiment of the present invention provides a metering device that can be set to reject remote power-off, and based on any of the above embodiments, Figures 1 to 8 As shown, the switch circuit G1 includes: a switch device S1, a TVS tube D2, a thermistor R4 and a thermistor R18;

[0075] Two ends of the switch device S1 are connected to one end of the thermistor R4 and one end of the thermistor R18 respectively, and two ends of the TVS tube D2 are connected to the other end of the thermistor R4 and one end of the thermistor R18 respectively.

[0076] In this embodiment, when the input port or the switch device S1 encounters a strong electric attack, the TVS tube D2 can effectively clamp the input voltage at a safe level, thereby protecting the back-end circuit and the central system of the meter. Thermistors R4 and R18, under strong voltage, increase their resistance as the time / temperature acting on the PTC resistors R4 and R18 increases, thereby suppressing the loop current at a certain level to protect the damage to the back-end circuit. The form of the switch device S1 includes but is not limited to toggle switches, push switches, and wireable terminals. The mode of operating the switch device S1 can be manual or automatic.

[0077] The fourth embodiment of the present invention provides a metering device that can be set to reject remote power-off, and based on any of the above embodiments, Figures 1 to 8 As shown, the isolation circuit G2 includes: a resistor R2, a photocoupler U1 and a resistor R13;

[0078] The power source VDD is connected to the input end of the primary light-emitting diode of the photocoupler U1 through the resistor R2, and the switch circuit is connected in series between the output end of the primary light-emitting diode of the photocoupler U1 and the ground;

[0079] The power source VCC1 is connected to the input end of the secondary photosensitive device of the photocoupler U1, and the output end of the secondary photosensitive device of the photocoupler U1 is connected to the detection circuit and grounded via the resistor R13.

[0080] In this embodiment, when the switch device S1 is turned on, that is, the signal input to the isolation circuit G2 is in a short-circuit state, the power supply VDD forms a conduction loop with the primary light-emitting tube of the photocoupler U1 through the resistor R2, the photocoupler U1 works in the conduction state, and the isolation circuit G2 outputs a high-level signal; when the switch device S1 is turned off, that is, the signal input to the isolation circuit G2 is in an open-circuit state, the primary light-emitting tube of the photocoupler U1 does not have a complete loop, the photocoupler U1 works in the cut-off state, and the isolation circuit G2 outputs a low-level signal.

[0081] A fifth embodiment of the present invention provides a metering device capable of refusing remote power-off. Based on any of the above embodiments, Figures 1 to 8 As shown, the detection circuit G3 includes: a resistor R12, a transistor Q3 and a resistor R7;

[0082] The output terminal of the secondary photosensitive device of the photocoupler U1 is connected to the base of the transistor Q3 through the resistor R12;

[0083] The power source VCC1 is connected to the collector of the transistor Q3 via the resistor R7, and one input terminal of the microprocessing unit D is connected to the collector of the transistor Q3;

[0084] The emitter of transistor Q3 is connected to ground.

[0085] In this embodiment, when the signal input to the detection circuit G3 is a high level, the output signal of the detection circuit G3 is a low level signal, the low level signal is uploaded to the microprocessing unit D, the microprocessing unit D recognizes that the switch device S1 is in a closed state, and the metering device is in a special working mode; when the signal input to the detection circuit G3 is a low level, the output signal of the detection circuit G3 is a high level signal, the high level signal is uploaded to the microprocessing unit D, the microprocessing unit D recognizes that the switch device S1 is in a disconnected state, and the metering device is in a normal working mode.

[0086] The sixth embodiment of the present invention provides a metering device that can be set to reject remote power-off, and based on any of the above embodiments, Figures 1 to 8 As shown, the control circuit G4 includes: a resistor R1, a resistor R3, a resistor R4, a resistor R14, a transistor Q2 and a MOS tube Q1;

[0087] The collector of the transistor Q3 is connected to the base of the transistor Q2 via the resistor R14, the power source VCC2 is connected to the collector of the transistor Q2 via the resistor R1 and the resistor R4, and the emitter of the transistor Q2 is grounded;

[0088] One end of the resistor R3 is connected between the resistor R1 and the resistor R4, the other end of the resistor R3 is connected to the gate of the MOS transistor Q1, the drain of the MOS transistor Q1 is connected to the power supply VCC2, and the source of the MOS transistor Q1 is connected to the driving circuit G5.

[0089] In this embodiment, when the signal input to the control circuit G4 is at a high level, that is, when the collector output of the transistor Q3 is at a high level, the signal provides the base current of the transistor Q2 through the resistor R14, and the transistor Q2 works in the on state. VCC2 forms a current loop through the resistors R1, R4 and the transistor Q2. The resistors R1 and R4 form a voltage divider in the current loop, so that the voltage difference between the VGS of the MOS transistor Q1 meets the on threshold, and the MOS transistor Q1 works in the on state. The output voltage VCC3 of the control circuit G4 is theoretically equivalent to the voltage of the power supply VCC2.

[0090] When the signal input to the control circuit G4 is at a low level, that is, the collector output of the transistor Q3 is at a low level, the signal cannot provide the base current of the transistor Q2 through the resistor R14, and the transistor Q2 works in the cut-off state. The power supply VCC2 cannot form a current loop through the resistors R1, R4 and the transistor Q2. The resistors R1 and R4 do not form a voltage divider in the current loop, so that the voltage difference between the VGS of the MOS tube Q1 is 0, and the conduction threshold is not reached. The MOS tube Q1 works in the cut-off state, and the output voltage VCC3 of the control circuit G4 is 0V or close to 0V.

[0091] The seventh embodiment of the present invention provides a metering device that can be set to reject remote power-off, and based on any of the above embodiments, Figures 1 to 8 As shown, the driving circuit G5 includes a driving chip and a relay;

[0092] The source of the MOS tube Q1 is connected to the power input terminal of the driving chip, the control terminal of the driving chip is connected to the microprocessing unit D, and the output terminal of the driving chip is connected to a relay, which is used to realize the closing and closing of the metering device.

[0093] In this embodiment, when the output voltage VCC3 of the control circuit G4 is equal to or close to the voltage of the power supply VCC2, that is, the drive circuit G5 can obtain normal power supply, the microprocessing unit D can normally perform remote opening and closing commands on the relay through the drive chip, and the metering device is in a normal working mode;

[0094] When the output voltage VCC3 of the control circuit G4 is 0V or close to 0V, that is, the power supply of the drive circuit G5 is physically disconnected, the microprocessor D cannot normally remotely open and close the relay through the drive chip, and the metering device is in a special working mode.

[0095] The eighth embodiment of the present invention provides a metering device that can be set to reject remote power-off, and based on any of the above embodiments, Figures 1 to 8 As shown, it also includes a power supply unit C for supplying power to various units inside the metering device.

[0096] In this embodiment, the power supply unit C is connected to the other units in the device, including but not limited to switching power supply, linear power supply and other design schemes. Specifically, a switching power supply design scheme can be adopted, the device is used at a reduced rating, and a wide voltage range input is supported to ensure stable operation of the metering device.

[0097] The ninth embodiment of the present invention provides a metering device that can be set to reject remote power-off, and based on any of the above embodiments, Figures 1 to 8 As shown, it also includes a display unit B for displaying electric energy metering data, relay status, metering device configuration parameters and alarm prompts.

[0098] In this embodiment, the display unit B includes display parts such as LED and LCD, which can display metering data, relay status, metering device configuration parameters, alarm prompts and other information, wherein the implementation of LCD includes but is not limited to COG, COB, etc.

[0099] The tenth embodiment of the present invention provides a metering device that can be set to reject remote power-off, and based on any of the above embodiments, Figures 1 to 8 As shown, it also includes a storage unit E for storing and backing up data and a metering unit F for collecting and calculating metering data.

[0100] In this embodiment, the storage unit E is responsible for storing data such as metering data, logs and event records of the metering device; the metering unit F is responsible for collecting and processing power grid signals, completing the collection and calculation of metering data, mainly including voltage, current, frequency, power factor, electric energy and other electric energy data of each corresponding metering unit F. The specific implementation methods include but are not limited to CT, manganese copper, Hall, and TMR.

[0101] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0102] Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A metering device capable of rejecting remote power-off, characterized in that: include: Communication unit A, microprocessing unit D, relay unit G; The communication unit A is used to communicate with the master station system, upload device data and process commands issued by the master station; The microprocessing unit D is connected to the communication unit A and is used to run the control program, process the metering data, detect and judge events, perform logical calculations and execute commands; The relay unit G is used to control the switch of the load end, including a driving chip or a transistor module for controlling the relay to open and close. The driving chip or the transistor module is connected to the microprocessing unit D. By controlling the power supply of the driving chip or the transistor module, the metering device can reject the remote switch-off function. The relay unit G includes a switch circuit G1, an isolation circuit G2, a detection circuit G3, a control circuit G4 and a drive circuit G5; The switch circuit G1 is provided with a switch device, which is used to use the on-off state change of the switch device as an output signal and input it to the isolation circuit G2; The isolation circuit G2 is connected to the detection circuit G3, and is used to isolate the switch circuit G1 from the detection circuit G3, and generate an output signal according to the switch device on-off state change signal and transmit it to the detection circuit G3; The detection circuit G3 is connected to the microprocessing unit D and the control circuit G4 respectively, generates an output signal according to the level of the input signal, and sends the output signal to the microprocessing unit D and the control circuit G4 respectively, and the microprocessing unit D identifies the working mode of the metering device according to the level of the output signal; The control circuit G4 is connected to the driving circuit G5, and controls the magnitude of the output voltage VCC3 according to the input signal level, and the output voltage VCC3 is used to power the driving circuit G5; The driving circuit G5 includes a driving chip or a transistor module, which is connected to the microprocessing unit D. When the output voltage VCC3 of the control circuit G4 meets the threshold requirement, the microprocessing unit D can control the metering device to remotely open or close the switch through the driving chip or the transistor module; when the output voltage VCC3 of the control circuit G4 is 0V, the microprocessing unit D cannot control the metering device to remotely open or close the switch through the driving chip or the transistor module.

2. A metering device capable of rejecting remote power-off according to claim 1, characterized in that: The switch circuit G1 includes: a switch device S1, a TVS tube D2, a thermistor R4 and a thermistor R18; Two ends of the switch device S1 are connected to one end of the thermistor R4 and one end of the thermistor R18 respectively, and two ends of the TVS tube D2 are connected to the other end of the thermistor R4 and one end of the thermistor R18 respectively.

3. A metering device capable of rejecting remote power-off according to claim 2, characterized in that: The isolation circuit G2 includes: a resistor R2, a photocoupler U1 and a resistor R13; The power source VDD is connected to the input end of the primary light-emitting diode of the photocoupler U1 through the resistor R2, and the switch circuit is connected in series between the output end of the primary light-emitting diode of the photocoupler U1 and the ground; The power source VCC1 is connected to the input end of the secondary photosensitive device of the photocoupler U1, and the output end of the secondary photosensitive device of the photocoupler U1 is connected to the detection circuit and grounded via the resistor R13.

4. A metering device capable of rejecting remote power-off according to claim 3, characterized in that: The detection circuit G3 includes: a resistor R12, a transistor Q3 and a resistor R7; The output terminal of the secondary photosensitive device of the photocoupler U1 is connected to the base of the transistor Q3 through the resistor R12; The power source VCC1 is connected to the collector of the transistor Q3 via the resistor R7, and one input terminal of the microprocessing unit D is connected to the collector of the transistor Q3; The emitter of transistor Q3 is connected to ground.

5. A metering device capable of rejecting remote power-off according to claim 4, characterized in that: The control circuit G4 includes: a resistor R1, a resistor R3, a resistor R4, a resistor R14, a transistor Q2 and a MOS tube Q1; The collector of the transistor Q3 is connected to the base of the transistor Q2 via the resistor R14, the power source VCC2 is connected to the collector of the transistor Q2 via the resistor R1 and the resistor R4, and the emitter of the transistor Q2 is grounded; One end of the resistor R3 is connected between the resistor R1 and the resistor R4, the other end of the resistor R3 is connected to the gate of the MOS transistor Q1, the drain of the MOS transistor Q1 is connected to the power supply VCC2, and the source of the MOS transistor Q1 is connected to the driving circuit G5.

6. A metering device capable of rejecting remote power-off according to claim 5, characterized in that: The driving circuit G5 includes a driving chip and a relay; The source of the MOS tube Q1 is connected to the power input terminal of the driving chip, the control terminal of the driving chip is connected to the microprocessing unit D, and the output terminal of the driving chip is connected to a relay, which is used to realize the closing and closing of the metering device.

7. A metering device capable of rejecting remote power-off according to any one of claims 1 to 6, characterized in that: It also includes a power supply unit C for supplying power to various units inside the metering device.

8. A metering device capable of rejecting remote power-off according to any one of claims 1 to 6, characterized in that: It also includes a display unit B for displaying electric energy metering data, relay status, metering device configuration parameters and alarm prompts.

9. A metering device capable of rejecting remote power-off according to any one of claims 1 to 6, characterized in that: It also includes a storage unit E for storing and backing up data and a metering unit F for collecting and calculating metering data.

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