Transformers, circuit breakers, radio frequency devices, and transformer assemblies

Abstract

The application discloses a mutual inductor, a circuit breaker, a radio frequency device and a mutual inductor assembly, and relates to the technical field of power grid power detection. The mutual inductor comprises a radio frequency tag, a mutual inductor control circuit, a current mutual inductor assembly and a current detection circuit. The mutual inductor control circuit is electrically connected with the radio frequency tag to communicate with an external terminal via the radio frequency tag. The current mutual inductor assembly is arranged around a power grid power supply line and obtains a power supply voltage. The current detection circuit is used for detecting the current of the power grid power supply line and outputs a current detection signal to the mutual inductor control circuit. The mutual inductor control circuit is used for obtaining a voltage detection signal and a clock signal of the power grid power supply line via the radio frequency tag, and confirming instantaneous power according to the current detection signal, the voltage detection signal and the clock signal, so as to confirm the power consumption of a power consumption terminal. The radio frequency tag is used for receiving the power consumption signal output by the mutual inductor control circuit and outputting the power consumption signal to the external terminal. The application aims to simplify the structure and volume of the power grid power detection device.

Description

Technical Field

[0001] This invention relates to the field of power grid detection technology, and in particular to a current transformer, circuit breaker, radio frequency device, and current transformer assembly. Background Technology

[0002] In existing technologies, smart circuit breakers can monitor the grid output power using built-in voltage and current sensors. However, single-pole circuit breakers cannot directly obtain the grid voltage; instead, additional reference points need to be set to confirm the grid voltage and then calculate the grid output power. In multi-pole circuit breakers, voltage sensors need to be set for each phase to calculate the grid output power. Therefore, both single-pole and multi-pole circuit breakers suffer from complex overall structures. Summary of the Invention

[0003] The main objective of this invention is to provide a current transformer, circuit breaker, radio frequency device, and current transformer assembly, which aims to simplify the structure and volume of power grid detection devices.

[0004] To achieve the above objectives, the present invention provides a current transformer, the current transformer comprising:

[0005] Radio frequency tags;

[0006] A mutual inductance control circuit is electrically connected to the RFID tag to communicate with an external terminal via the RFID tag;

[0007] A current transformer assembly, wherein the current transformer assembly is arranged in a loop around the power grid supply line and obtains the power supply voltage;

[0008] A current detection circuit is provided, wherein the input terminal of the current detection circuit is electrically connected to the current transformer component, and the output terminal of the current detection circuit is electrically connected to the transformer control circuit; the current detection circuit is used to detect the current of the power grid supply line and output a current detection signal to the transformer control circuit.

[0009] The mutual inductance control circuit is used to acquire the voltage detection signal and clock signal of the power grid supply line via the radio frequency tag, and to confirm the instantaneous power based on the current detection signal, the voltage detection signal and the clock signal, so as to confirm the power consumption of the power user.

[0010] The RFID tag is used to receive the power consumption signal output by the mutual inductance control circuit and output it to an external terminal.

[0011] In one embodiment, the current transformer includes a power supply circuit, the input terminal of which is electrically connected to the current transformer component, and the output terminal of which is electrically connected to the power supply terminal of the current transformer control circuit and the power supply terminal of the current detection circuit; the power supply circuit is used to stabilize the power supply voltage output by the current transformer component at a preset voltage and output it.

[0012] In one embodiment, the RFID tag is a passive tag, and the current transformer further includes:

[0013] A switch assembly, wherein a first end of the switch assembly is connected to a first terminal block, and a second end of the switch assembly is connected to a second terminal block;

[0014] A switch detection sensor is provided, wherein the power supply terminal of the switch detection sensor is electrically connected to the power output terminal of the passive tag, and the data output terminal of the switch detection sensor is electrically connected to the data receiving terminal of the passive tag; the switch detection sensor is used to detect the working state of the switch assembly and output a switch detection signal to the RFID tag.

[0015] The first terminal is electrically connected to the power supply terminal, and the second terminal is electrically connected to the power consumption terminal.

[0016] In one embodiment, the mutual inductor further includes:

[0017] A first temperature sensor, wherein the power supply terminal of the first temperature sensor is electrically connected to the power output terminal of the passive tag, and the data output terminal of the first temperature sensor is electrically connected to the data receiving terminal of the passive tag; the first temperature sensor is used to detect the temperature of the first terminal block and output a first temperature detection signal; and / or,

[0018] The second temperature sensor has its power supply terminal electrically connected to the power output terminal of the passive tag, and its data output terminal electrically connected to the data receiving terminal of the passive tag. The second temperature sensor is used to detect the temperature of the second terminal block and output a second temperature detection signal.

[0019] In one embodiment, the current transformer further includes a housing, and the radio frequency tag is disposed on the surface of the housing; the housing has an opening corresponding to the radio frequency tag, and the radio frequency tag is electrically connected to the current transformer control circuit through the opening.

[0020] The present invention also proposes a circuit breaker comprising a current transformer as described in any of the preceding claims.

[0021] The present invention also proposes a radio frequency device, characterized in that the radio frequency device is used in conjunction with a current transformer as described in any of the preceding claims or a circuit breaker as described in the preceding claims, the radio frequency device comprising:

[0022] An RF reader / writer, wherein the RF reader / writer is used to output RF signals and receive feedback signals;

[0023] A radio frequency control circuit, which is electrically connected to the radio frequency reader / writer;

[0024] A voltage detection circuit is provided, wherein the input terminal of the voltage detection circuit is electrically connected to the power grid supply line, and the output terminal of the voltage detection circuit is electrically connected to the radio frequency control circuit; the voltage detection circuit is used to detect the supply voltage of the power grid supply line and output a corresponding voltage detection signal to the radio frequency control circuit.

[0025] A communication component, wherein a first end of the communication component is electrically connected to the radio frequency control circuit, and a second end of the communication component is communicatively connected to a host computer; the communication component is used for communication interaction between the radio frequency device and the host computer;

[0026] The radio frequency control circuit is used to output the voltage detection signal while the radio frequency reader outputs the radio frequency signal, so as to obtain the feedback signal.

[0027] In one embodiment, the radio frequency device further includes a clock circuit, the output of which is electrically connected to the radio frequency control circuit; the clock circuit is used to output a clock signal to the radio frequency control circuit.

[0028] The radio frequency control circuit is also used to output the voltage detection signal and the clock signal simultaneously with the output of the radio frequency signal via the radio frequency reader / writer, so as to obtain a feedback signal.

[0029] In one embodiment, the radio frequency device includes a housing and a mounting base disposed on the housing, wherein the housing is provided with the radio frequency reader / writer, the radio frequency control circuit, the voltage detection circuit and the communication component.

[0030] The present invention also proposes a current transformer assembly, the current transformer assembly comprising a current transformer as described in any of the above embodiments and a radio frequency device as described in any of the above embodiments, or a circuit breaker as described in the above embodiments and a radio frequency device as described in any of the above embodiments.

[0031] The current transformer is connected to the radio frequency device when it receives the radio frequency signal output by the radio frequency device; the radio frequency device is also used to connect to the host computer.

[0032] This invention simplifies the structure and size of a power grid detection device by employing a current transformer. The current transformer includes an RFID tag, a current transformer control circuit, a current transformer component, and a current detection circuit. The current transformer control circuit is electrically connected to the RFID tag, enabling communication with an external terminal via the RFID tag. The current transformer component is looped around the power grid supply line, allowing the acquisition of the corresponding power supply voltage. The input terminal of the current detection circuit is electrically connected to the current transformer component, detecting the current in the power grid supply line and outputting a current detection signal to the current transformer control circuit. The current transformer control circuit acquires the voltage detection signal and clock signal from the power grid supply line via the RFID tag, and determines the instantaneous power based on the current detection signal, voltage detection signal, and clock signal. This instantaneous power is then used to calculate the power consumption of the user terminal within a corresponding time period, i.e., the energy consumption of the user terminal. This method avoids the need for complex voltage detection circuits within the current transformer, especially for multi-phase detection in three-phase power, effectively simplifying the structure and size of the power grid detection device. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the current transformer module of the present invention;

[0035] Figure 2 This is a schematic diagram of a module of an embodiment of the current transformer of the present invention;

[0036] Figure 3 This is a schematic diagram of the radio frequency device of the present invention;

[0037] Figure 4 This is a schematic diagram of a module of an embodiment of the radio frequency device of the present invention.

[0038] Explanation of icon numbers:

[0039] 10. Radio Frequency Tag; 11. Passive Tag; 20. Mutual Inductance Control Circuit; 30. Current Mutual Inductance Component; 40. Current Detection Circuit; 50. Power Supply Circuit; 60. Switch Component; 70. Switch Detection Sensor; 80. First Temperature Detection Sensor; 90. Second Temperature Detection Sensor; 100. Radio Frequency Reader / Writer; 110. Radio Frequency Control Circuit; 120. Voltage Detection Circuit; 130. Communication Component; 140. Clock Circuit.

[0040] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0043] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0044] In existing technologies, smart circuit breakers can monitor the grid output power using built-in voltage and current sensors. However, single-pole circuit breakers cannot directly obtain the grid voltage; instead, additional reference points need to be set to confirm the grid voltage and then calculate the grid output power. In multi-pole circuit breakers, voltage sensors need to be set for each phase to calculate the grid output power. Therefore, both single-pole and multi-pole circuit breakers suffer from complex overall structures.

[0045] To solve the above problems, refer to Figure 1 The present invention proposes a current transformer, the current transformer comprising:

[0046] RFID tag 10;

[0047] Mutual inductance control circuit 20, which is electrically connected to the radio frequency tag 10 to communicate with an external terminal via the radio frequency tag 10;

[0048] Current transformer component 30, which is arranged in a ring around the power grid supply line and obtains the power supply voltage;

[0049] A current detection circuit 40 is provided, the input terminal of which is electrically connected to the current transformer component 30, and the output terminal of which is electrically connected to the transformer control circuit 20. The current detection circuit 40 is used to detect the current of the power grid supply line and output a current detection signal to the transformer control circuit 20.

[0050] The mutual inductance control circuit 20 is used to acquire the voltage detection signal and clock signal of the power grid supply line through the radio frequency tag 10, and to confirm the instantaneous power based on the current detection signal, the voltage detection signal and the clock signal, so as to confirm the power consumption of the power consumption end;

[0051] The radio frequency tag 10 is used to receive the power consumption signal output by the mutual inductance control circuit 20 and output it to an external terminal.

[0052] It is understandable that circuit breakers include single-pole circuit breakers and multi-pole circuit breakers. For a single-pole circuit breaker to detect the voltage connected to the power grid, since voltage is a potential difference, a reference point is necessary. In a single-pole circuit breaker, typically only the live wire is disconnected, while the neutral wire is directly connected. If the circuit breaker needs to detect the live wire voltage, a reference point is required. Using the neutral wire as a reference, one end of the voltage detection circuit needs to be connected to the live wire, and the other end to the neutral wire, thus measuring the voltage between the live and neutral wires. The normal voltage is typically 220V. Alternatively, the ground wire can be used as a reference, as its potential is close to zero under normal conditions. If the voltage detection circuit is only connected to the live wire and not to the neutral or ground wire as a reference, a measurement loop cannot be formed, and the voltage of the live wire to ground cannot be determined. Therefore, to calculate the grid output power in a single-pole circuit breaker, one end of the voltage detection circuit 120 needs to be connected to either the neutral or ground wire. However, single-pole circuit breakers are typically only connected to the live wire, requiring additional structural elements for the voltage detection circuit 120. For multi-pole circuit breakers, it is necessary to measure the phase voltage of each phase relative to the neutral wire. For example, a three-phase circuit breaker requires three sets of voltage detection circuits 120 to detect the phase voltages of phases A, B, and C relative to the neutral wire to confirm the calculation of the grid output power. This also leads to a complex overall structure for multi-pole circuit breakers.

[0053] In this embodiment, the RFID tag 10 includes an RFID chip and an antenna. The antenna of the RFID tag 10 can capture the RFID signals emitted by the RFID reader 100 and output them to the RFID chip. In addition, the antenna of the RFID tag 10 can also reflect the data processed by the chip back to the reader in the form of electromagnetic waves, and simultaneously receive instructions sent by the RFID reader 100.

[0054] In this embodiment, the mutual inductance control circuit 20 can be implemented using FPGA (Field Programmable Gate Array), PLC (Programmable Logic Controller), MCU (Microcontroller Unit), DSP (Digital Signal Processor), SOC (System On Chip), etc.

[0055] In this embodiment, the current transformer component 30 can be implemented using an energy harvesting transformer. The current transformer component 30 is looped around the power grid supply line, thereby converting the AC voltage induced by the current transformer coil into a corresponding power supply voltage to power the RFID tag 10, the current transformer control circuit 20, the current detection circuit 40, etc., within the transformer. The transformer includes a power supply circuit 50, the input terminal of which is electrically connected to the current transformer component 30, and the output terminal of which is electrically connected to the power supply terminals of the current transformer control circuit 20 and the current detection circuit 40. The power supply circuit 50 is used to stabilize the power supply voltage output by the current transformer component at a preset voltage and then output it. The power supply circuit 50 can be implemented using a corresponding voltage conversion circuit and a linear voltage regulator circuit. It is understood that the voltage obtained from the power grid using the current transformer component 30 is a fluctuating AC voltage, while the RFID tag 10, the current transformer control circuit 20, the current detection circuit 40, etc., all require a stable DC voltage. Therefore, the voltage conversion circuit can be implemented using an AC to DC voltage conversion circuit to convert the acquired AC voltage into the corresponding DC voltage.

[0056] In this embodiment, the current detection circuit 40 can be implemented using a current transformer circuit, a Hall effect current detection circuit 40, a shunt circuit, etc. The current detection circuit 40 acquires the current on the power grid supply line corresponding to the transformer and outputs a corresponding current detection signal to the transformer control circuit 20, so that the transformer control circuit 20 can confirm the current value at the corresponding moment based on the current detection signal. It should be noted that while acquiring the current detection signal output by the current detection circuit 40, the transformer control circuit 20 also acquires the voltage detection signal and clock signal input from the external device via the RFID tag 10. It is understood that the transformer control circuit 20 internally has a corresponding clock circuit 140 to confirm the current signal at the corresponding moment, and by acquiring the clock signal and voltage detection signal, it correlates the current detection signal and voltage detection signal at the same moment, thereby calculating the instantaneous power of the power grid at the corresponding moment. The external device needs to be equipped with a corresponding voltage detection circuit 120, clock circuit 140, and RFID reader / writer 100, and the power grid supply line detected by the voltage detection circuit 120 needs to be consistent with the power grid supply line detected by the current detection circuit 40. For example, the voltage detection circuit 120 in the external device detects phase A of the mains power supply line, and the current detection circuit 40 in the transformer also detects phase A of the mains power supply line. When the transformer is a multi-pole circuit breaker, the external device needs to include multiple voltage detection circuits 120 to detect the voltage on multiple mains power supply lines. This allows the transformer control circuit 20 to calculate the instantaneous power on each mains power supply line based on the current detection signals output by the multiple current detection circuits 40, and the multiple voltage detection signals and clock signals received by the RFID tag 10. By calculating the instantaneous power on each mains power supply line, the power consumption of the consumer within the corresponding time period is calculated, and the power consumption signal received from the transformer control circuit is transmitted to the external terminal via the RFID tag. Specifically, after confirming the instantaneous power, the transformer control circuit can accurately calculate the energy consumption of the electrical circuit by combining the instantaneous power data with integral calculations. Here, electrical energy is the accumulation of power over time. Therefore, by integrating different types of power over time, we can obtain the corresponding electrical energy, which includes active energy, reactive energy, and apparent energy.

[0057] This application simplifies the structure and size of a power grid detection device by employing a current transformer. The current transformer includes an RFID tag 10, a current transformer control circuit 20, a current transformer assembly 30, and a current detection circuit 40. The current transformer control circuit 20 is electrically connected to the RFID tag 10, enabling communication with an external terminal via the RFID tag 10. The current transformer assembly 30 is looped around the power grid supply line, allowing the acquisition of the corresponding power supply voltage via the power grid supply line. The input terminal of the current detection circuit 40 is electrically connected to the current transformer assembly 30, thereby detecting the current in the power grid supply line and outputting a current detection signal to the current transformer control circuit 20. The current transformer control circuit 20 acquires the voltage detection signal and clock signal from the power grid supply line via the RFID tag 10, and confirms the instantaneous power based on the current detection signal, voltage detection signal, and clock signal. This method avoids the need for a complex voltage detection circuit 120 within the current transformer, especially for multi-phase detection in three-phase power, effectively simplifying the structure and size of the power grid detection device.

[0058] refer to Figure 2 In one embodiment of the present invention, the radio frequency tag 10 is a passive tag 11, and the current transformer further includes:

[0059] A switch assembly 60, wherein a first end of the switch assembly 60 is connected to a first terminal block and a second end of the switch assembly 60 is connected to a second terminal block;

[0060] A switch detection sensor 70 is provided, the power supply terminal of which is electrically connected to the power output terminal of the passive tag 11, and the data output terminal of which is electrically connected to the data receiving terminal of the passive tag 11. The switch detection sensor 70 is used to detect the working state of the switch assembly 60 and output a switch detection signal to the radio frequency tag 10.

[0061] The first terminal is electrically connected to the power supply terminal, and the second terminal is electrically connected to the power consumption terminal.

[0062] It is important to note that the passive tag 11 has no built-in power supply and relies solely on the electromagnetic wave energy emitted by the reader / writer for operation. The passive tag 11 includes an antenna and a chip. The antenna of the passive tag 11 can capture the radio frequency (RF) signals emitted by the RF reader / writer 100 and convert them into electrical energy to power the chip of the passive tag 11. Furthermore, the antenna of the passive tag 11 can also reflect the data processed by the chip back to the reader / writer in the form of electromagnetic waves, while simultaneously receiving commands sent by the RF reader / writer 100. It is also important to note that the chip of the passive tag 11 includes a power output terminal to output a first voltage to the switch detection sensor 70 after receiving the RF signal, thereby powering the switch detection sensor 70. Further, the chip of the passive tag 11 also includes a corresponding voltage conversion circuit to convert the electrical energy output by the antenna of the passive tag 11 into a corresponding voltage to power the passive tag 11, and outputs the first voltage to the switch detection sensor 70 via the power output terminal to provide a power supply voltage for the switch detection sensor 70. The passive tag 11 chip also includes a data receiver. The data receiver of the passive tag 11 chip is electrically connected to the data output terminal of the switch detection sensor 70 and the mutual inductance control circuit 20, respectively, so as to receive the detection signal output by the switch detection sensor 70 and the data signal of the mutual inductance control circuit 20, and output them to an external terminal.

[0063] In this embodiment, the current transformer typically incorporates multiple sensors with different functions to detect the operating status of the current transformer and the power grid and output corresponding detection signals. Examples include a switch detection sensor 70, a temperature detection sensor, and a current detection sensor. It is understood that some of these sensors require very low power supply voltage and can operate simply by acquiring the first voltage output by the passive tag 11. Therefore, the power supply terminals of N out of the M sensors are electrically connected to the power output terminal of the passive tag 11, thereby acquiring the first voltage, i.e., the power supply voltage, via the passive tag 11. M is greater than or equal to N because the current transformer contains various types of sensors, and the first voltage output by the passive tag 11 cannot meet the power supply voltage requirements of all types of sensors. Furthermore, the power supply terminals of N out of the M sensors are electrically connected to the data receiving terminal of the passive tag 11. This outputs detection signals to the passive tag 11, which then transmits them to an external terminal, allowing users to conveniently and reliably confirm the operating status of the current transformer and / or the power grid.

[0064] Understandably, the electrical energy generated by the radio frequency signal received by the passive tag 11 may not be sufficient to meet the power requirements of multiple sensors. Therefore, the chip of the passive tag 11 also includes a corresponding gating circuit. The first terminal of the gating circuit is electrically connected to the output terminal of the voltage conversion circuit, and the second terminal is electrically connected to the power supply terminals of the multiple sensors respectively. The chip of the passive tag 11 acquires the radio frequency signal input from the external terminal to confirm the detection signal required by the external terminal, and then controls the gating circuit to conduct the output terminal of the voltage conversion circuit and the power supply terminal of the corresponding sensor, thereby utilizing the energy received by the passive tag 11 in a targeted manner.

[0065] In this embodiment, the switch assembly 60 can be implemented using a contact system and an operating mechanism. The first end of the switch assembly 60 is connected to a first terminal block, and the second end is connected to a second terminal block. It is understood that the first terminal block is electrically connected to the power supply end, and the second terminal block is electrically connected to the power consumption end. Therefore, the switch assembly 60 can conduct the path between the power supply end and the power consumption end when in the closed state, and disconnect the path between the power supply end and the power consumption end when in the open state. In a circuit breaker, the power supply end is typically the power grid, and the power consumption end is typically the user end. Therefore, the switch assembly 60 can connect, carry, and disconnect current under normal circuit conditions and certain fault conditions (such as overload or short circuit), and can safely disconnect fault current within a specified time. Users typically need to confirm the open / closed state of the switch assembly 60 in the circuit breaker to determine the cause of power supply abnormalities. For example, if there is a power outage at the user end, it may be because the switch assembly 60 in the circuit breaker is in the open state.

[0066] In this embodiment, the switch detection sensor 70 can be implemented using a pressure sensor, a mechanical sensor, a photoelectric sensor, etc. The power supply terminal of the switch detection sensor 70 is electrically connected to the power output terminal of the passive tag 11, and the data output terminal of the switch detection sensor 70 is electrically connected to the data receiving terminal of the passive tag 11. By placing the switch detection sensor 70 in the area corresponding to the switch assembly 60, the open / closed state of the switch assembly 60 is detected, and a corresponding switch detection signal is output to the passive tag 11. The passive tag 11 then outputs the switch detection signal to an external terminal, allowing the user to confirm the operating status of the switch assembly 60 in the circuit breaker.

[0067] Optionally, the current transformer further includes:

[0068] A first temperature sensor 80 is electrically connected to the power output terminal of the passive tag 11, and its data output terminal is electrically connected to the data receiving terminal of the passive tag 11. The first temperature sensor 80 is used to detect the temperature of the first terminal block and output a first temperature detection signal; and / or,

[0069] The second temperature sensor 90 has its power supply terminal electrically connected to the power output terminal of the passive tag 11, and its data output terminal electrically connected to the data receiving terminal of the passive tag 11. The second temperature sensor 90 is used to detect the temperature of the second terminal and output a second temperature detection signal.

[0070] In this embodiment, both the first temperature sensor 80 and the second temperature sensor 90 can be implemented using contact temperature sensors, thermocouple sensors, thermistors, etc. The first temperature sensor 80 is used to detect the first terminal, and the second temperature sensor 90 is used to detect the second terminal. The first terminal is used to connect to the power supply end, and the second terminal is used to connect to the user end. It is understood that connecting the first terminal and the second terminal to the power grid and the user's power supply end respectively could potentially pose a safety hazard. Therefore, by setting up the first temperature sensor 80 and the second temperature sensor 90, and electrically connecting the power supply terminals of the first temperature sensor 80 and the second temperature sensor 90 to the power output terminal of the passive tag 11, and electrically connecting the data output terminals of the first temperature sensor 80 and the second temperature sensor 90 to the data input terminal of the passive tag 11, the external terminal can confirm the temperature detection of the first and second terminals by acquiring the first and second temperature detection signals.

[0071] In one embodiment of the present invention, the current transformer further includes a housing, and the radio frequency tag 10 is disposed on the surface of the housing; the housing is provided with an opening corresponding to the radio frequency tag 10, and the radio frequency tag 10 is electrically connected to the current transformer control circuit 20 through the opening.

[0072] Understandably, current transformers typically contain a large amount of metal, which strongly reflects and shields radio frequency (RF) signals. If the antenna of the RFID tag 10 is isolated by metal, the electromagnetic wave energy it receives will be drastically attenuated, or even completely blocked, preventing the tag from being activated. Furthermore, current transformers are core components of power systems, generating strong electromagnetic noise and transient high voltages (such as switching arcs and short-circuit currents) during operation. This strong electromagnetic interference environment can overwhelm weak RFID signals, preventing readers from correctly identifying the tags. Therefore, to ensure that the RFID tag 10 on the current transformer can stably acquire RF signals, it needs to be placed on the surface of the current transformer's casing to minimize metal shielding and electromagnetic interference. In addition, the current transformer casing also has corresponding openings for the RFID tag 10, allowing the RFID tag 10 to be electrically connected to the current transformer control circuit 20, thereby enabling the current transformer control circuit 20 to acquire signals.

[0073] The present invention also proposes a circuit breaker comprising a current transformer as described in any of the preceding claims. It is worth noting that, since the circuit breaker of the present invention is based on the aforementioned current transformer, the embodiments of the circuit breaker of the present invention include all the technical solutions of all the aforementioned embodiments of the current transformer, and the achieved technical effects are exactly the same, and will not be repeated here.

[0074] refer to Figure 3 The present invention also proposes a radio frequency device for use with a current transformer as described in any of the preceding claims or a circuit breaker as described in the preceding claims, the radio frequency device comprising:

[0075] Radio frequency reader 100, the radio frequency reader 100 is used to output radio frequency signals and receive feedback signals;

[0076] Radio frequency control circuit 110, which is electrically connected to radio frequency reader / writer 100;

[0077] A voltage detection circuit 120 is provided, wherein the input terminal of the voltage detection circuit 120 is electrically connected to the power grid supply line, and the output terminal of the voltage detection circuit 120 is electrically connected to the radio frequency control circuit 110; the voltage detection circuit 120 is used to detect the supply voltage of the power grid supply line and output a corresponding voltage detection signal to the radio frequency control circuit 110.

[0078] A communication component 130 is provided, wherein a first end of the communication component 130 is electrically connected to the radio frequency control circuit, and a second end of the communication component 130 is communicatively connected to a host computer; the communication component 130 is used for communication interaction between the radio frequency device and the host computer.

[0079] The radio frequency control circuit is used to output the voltage detection signal while the radio frequency reader / writer 100 outputs the radio frequency signal, so as to obtain the feedback signal.

[0080] In this embodiment, the RFID reader 100 is used to transmit RFID signals and receive responses from the tags, and is responsible for communicating with the tags and outputting the received detection signals to the RFID control circuit. It should be noted that the energy of the RFID signal output by the RFID reader 100 needs to meet the operational requirements of the passive tag 11 and its corresponding sensor. The feedback signals received by the RFID reader include at least one of a power consumption signal, a switch detection signal, a first temperature detection signal, and a second temperature detection signal.

[0081] In this embodiment, the radio frequency control circuit 110 can be implemented using FPGA (Field Programmable Gate Array), PLC (Programmable Logic Controller), MCU (Microcontroller Unit), DSP (Digital Signal Processor), SOC (System On Chip), etc.

[0082] In this embodiment, the voltage detection circuit 120 can be implemented using a resistor divider circuit, a voltage comparator circuit, etc. The input terminal of the voltage detection circuit 120 is electrically connected to the mains power supply line, and the output terminal is electrically connected to the radio frequency control circuit 110, thereby outputting a corresponding voltage detection signal to the radio frequency control circuit 110. The radio frequency control circuit 110 then sends the corresponding voltage detection signal to the current transformer via the radio frequency reader / writer 100. It is understood that in the voltage detection of a three-phase power grid, the voltage detection circuit 120 uses a three-phase four-wire system to detect the phase voltages between phases A, B, and C and the neutral line, and outputs the first phase voltage detection signal, the second phase voltage detection signal, and the third phase voltage detection signal, respectively. Corresponding to the detection of the three-phase power grid, the current detection circuit 40 of the current transformer needs to be configured with three sets of current detection circuits to detect the currents of phases A, B, and C in the three-phase power grid, thereby obtaining the first phase current detection signal, the second phase current detection signal, and the third phase current detection signal. The radio frequency (RF) control circuit 110 transmits the first-phase voltage detection signal, the second-phase voltage detection signal, and the third-phase voltage detection signal to the RF tag 10 in the transformer via the RF reader / writer 100. The RF tag 10 then converts and outputs these signals to the transformer control circuit 20. The transformer control circuit 20 calculates the instantaneous power of the power grid by comparing the first-phase voltage detection signal, the second-phase voltage detection signal, and the third-phase voltage detection signal with the first-phase current detection signal, the second-phase current detection signal, and the third-phase current detection signal, respectively. Based on this instantaneous power, it calculates the electricity consumption at the user end within the corresponding time period, i.e., the energy consumption at the user end.

[0083] By moving the voltage detection circuit 120 out of the transformer or circuit breaker and setting it separately, the voltage of each phase in the power grid can be monitored centrally. Then, the voltage detection signal in the radio frequency device is sent to the transformer or circuit breaker via the radio frequency reader 100 and the radio frequency tag 10, which effectively avoids the problem of complex structure and volume of the power grid detection device in the transformer or circuit breaker.

[0084] In this embodiment, the first end of the communication component 130 is electrically connected to the radio frequency control circuit 110, and the second end of the communication component 130 is communicatively connected to the host computer, thereby realizing the communication connection between the radio frequency device and the host computer. The communication component 130 and the host computer can be connected via wired or wireless communication depending on actual needs. Wired communication can be implemented using bus communication or Ethernet communication; wireless communication can be implemented using WIFI, Bluetooth, 4 / 5G, etc.

[0085] Optionally, in practical applications, the radio frequency (RF) device may correspond to multiple current transformers or circuit breakers. Therefore, the data fed back by the RF tag 10 in the circuit breaker includes not only the detection signal but also the ID signal corresponding to the RF tag 10. By receiving the feedback signal and the IC signal corresponding to the RF tag 10, the RF device can associate the feedback signal with a current transformer or circuit breaker. For example, the first ID signal corresponds to the first circuit breaker, and the second ID signal corresponds to the second circuit breaker.

[0086] It is understood that the external terminals mentioned above refer to radio frequency devices and / or host computers.

[0087] It is worth noting that since the radio frequency device of the present invention is based on the aforementioned current transformer or circuit breaker, the embodiments of the radio frequency device of the present invention include all the technical solutions of all the aforementioned current transformer or circuit breaker embodiments, and the technical effects achieved are exactly the same, which will not be repeated here.

[0088] refer to Figure 4 In one embodiment of the present invention, the radio frequency device further includes a clock circuit 140, the output terminal of which is electrically connected to the radio frequency control circuit 110; the clock circuit 140 is used to output a clock signal to the radio frequency control circuit 110.

[0089] The radio frequency control circuit is also used to output the voltage detection signal and the clock signal at the same time as the radio frequency reader 100 outputs the radio frequency signal, so as to obtain a feedback signal.

[0090] It is understandable that the current transformer and the radio frequency (RF) device each include a current transformer control circuit 20 and an RF main control circuit, respectively. The current transformer is used to detect the current detection signal on the power grid supply line, while the RF main control circuit is used to detect the voltage detection signal on the power grid supply line. Furthermore, the RF reader / writer 100 in the RF device does not transmit the corresponding RF signal continuously, but rather broadcasts the RF signal at preset intervals, for example, the RF reader / writer 100 broadcasts the voltage detection signal within the corresponding time interval every 20ms. Therefore, the current transformer or circuit breaker also needs to obtain the clock signal of the RF device to correlate the current detection signal with the voltage detection signal at the corresponding moment, thereby calculating the instantaneous power at the corresponding moment. The clock circuit 140 can be implemented using a crystal oscillator circuit or a ceramic resonator circuit.

[0091] In one embodiment of the present invention, the radio frequency device includes a housing and a mounting base disposed on the housing. The housing is provided with the radio frequency reader 100, the radio frequency control circuit 110, the voltage detection circuit 120 and the communication component 130.

[0092] In this embodiment, the radio frequency (RF) device needs to electrically connect the input terminal of the voltage detection circuit 120 to the mains power supply line to obtain the corresponding voltage detection signal. Therefore, the RF device needs to be fixedly installed to stably obtain the voltage detection signal from the mains power supply line. The fixed RF device includes a housing and a mounting base mounted on the housing. The housing of the fixed RF device houses an RF reader / writer 100, an RF control circuit, and a communication component 130. This allows the fixed RF device to transmit RF signals to the current transformer or circuit breaker within a preset range and corresponding direction via the RF reader / writer 100, receive feedback signals output by the circuit breaker, and upload the feedback signals to a host computer. The feedback signals may include switch detection signals, temperature detection signals, and instantaneous power calculation results, etc.

[0093] This invention also proposes a current transformer assembly, characterized in that the current transformer assembly includes a current transformer as described in any of the above embodiments and a radio frequency device as described in any of the above embodiments, or a circuit breaker as described in any of the above embodiments and a radio frequency device as described in any of the above embodiments; wherein the current transformer is communicatively connected when receiving a radio frequency signal output by the radio frequency device; the radio frequency device is further used for communicative connection with a host computer. It is worth noting that since the current transformer assembly of this invention is based on the above-described current transformer or circuit breaker and radio frequency device, the embodiments of the current transformer assembly of this invention include all the technical solutions of all the embodiments of the above-described current transformer or circuit breaker and radio frequency device, and the achieved technical effects are also completely the same, and will not be repeated here.

[0094] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A current transformer, characterized in that, The current transformer includes: Radio frequency tags; A mutual inductance control circuit is electrically connected to the RFID tag to communicate with an external terminal via the RFID tag; A current transformer assembly, wherein the current transformer assembly is arranged in a loop around the power grid supply line and obtains the power supply voltage; A current detection circuit is provided, wherein the input terminal of the current detection circuit is electrically connected to the current transformer component, and the output terminal of the current detection circuit is electrically connected to the transformer control circuit; the current detection circuit is used to detect the current of the power grid supply line and output a current detection signal to the transformer control circuit. The mutual inductance control circuit is used to acquire the voltage detection signal and clock signal of the power grid supply line via the radio frequency tag, and to confirm the instantaneous power based on the current detection signal, the voltage detection signal and the clock signal, so as to confirm the power consumption of the power user. The RFID tag is used to receive the power consumption signal output by the mutual inductance control circuit and output it to an external terminal.

2. The current transformer as described in claim 1, characterized in that, The current transformer includes a power supply circuit. The input terminal of the power supply circuit is electrically connected to the current transformer component, and the output terminal of the power supply circuit is electrically connected to the power supply terminal of the current transformer control circuit and the power supply terminal of the current detection circuit. The power supply circuit is used to stabilize the power supply voltage output by the current transformer component at a preset voltage and then output it.

3. The current transformer as described in claim 1, characterized in that, The RFID tag is a passive tag, and the current transformer also includes: A switch assembly, wherein a first end of the switch assembly is connected to a first terminal block, and a second end of the switch assembly is connected to a second terminal block; A switch detection sensor is provided, wherein the power supply terminal of the switch detection sensor is electrically connected to the power output terminal of the passive tag, and the data output terminal of the switch detection sensor is electrically connected to the data receiving terminal of the passive tag; the switch detection sensor is used to detect the working state of the switch assembly and output a switch detection signal to the RFID tag. The first terminal is electrically connected to the power supply terminal, and the second terminal is electrically connected to the power consumption terminal.

4. The current transformer as described in claim 3, characterized in that, The current transformer also includes: A first temperature sensor, wherein the power supply terminal of the first temperature sensor is electrically connected to the power output terminal of the passive tag, and the data output terminal of the first temperature sensor is electrically connected to the data receiving terminal of the passive tag; the first temperature sensor is used to detect the temperature of the first terminal block and output a first temperature detection signal; and / or, The second temperature sensor has its power supply terminal electrically connected to the power output terminal of the passive tag, and its data output terminal electrically connected to the data receiving terminal of the passive tag. The second temperature sensor is used to detect the temperature of the second terminal block and output a second temperature detection signal.

5. The current transformer as described in claim 1, characterized in that, The current transformer also includes a housing, and the radio frequency tag is disposed on the surface of the housing; the housing has an opening corresponding to the radio frequency tag, and the radio frequency tag is electrically connected to the current transformer control circuit through the opening.

6. A circuit breaker, characterized in that, The circuit breaker includes a current transformer as described in any one of claims 1 to 5.

7. A radio frequency device, characterized in that, The radio frequency device is used in conjunction with a current transformer as described in any one of claims 1 to 5 or a circuit breaker as described in claim 6, the radio frequency device comprising: An RF reader / writer, wherein the RF reader / writer is used to output RF signals and receive feedback signals; A radio frequency control circuit, which is electrically connected to the radio frequency reader / writer; A voltage detection circuit is provided, wherein the input terminal of the voltage detection circuit is electrically connected to the power grid supply line, and the output terminal of the voltage detection circuit is electrically connected to the radio frequency control circuit; the voltage detection circuit is used to detect the supply voltage of the power grid supply line and output a corresponding voltage detection signal to the radio frequency control circuit. A communication component, wherein a first end of the communication component is electrically connected to the radio frequency control circuit, and a second end of the communication component is communicatively connected to a host computer; the communication component is used for communication interaction between the radio frequency device and the host computer; The radio frequency control circuit is used to output the voltage detection signal while the radio frequency reader outputs the radio frequency signal, so as to obtain the feedback signal.

8. The radio frequency device as claimed in claim 7, characterized in that, The radio frequency device further includes a clock circuit, the output of which is electrically connected to the radio frequency control circuit; the clock circuit is used to output a clock signal to the radio frequency control circuit. The radio frequency control circuit is also used to output the voltage detection signal and the clock signal simultaneously with the output of the radio frequency signal via the radio frequency reader / writer, so as to obtain a feedback signal.

9. The radio frequency device as claimed in claim 7, characterized in that, The radio frequency device includes a housing and a mounting base disposed on the housing. The housing contains the radio frequency reader, the radio frequency control circuit, the voltage detection circuit, and the communication components.

10. A current transformer assembly, characterized in that, The current transformer assembly includes a current transformer as described in any one of claims 1 to 5 and a radio frequency device as described in any one of claims 7 to 9, or a circuit breaker as described in claim 6 and a radio frequency device as described in any one of claims 7 to 9; The current transformer is connected to the radio frequency device when it receives the radio frequency signal output by the radio frequency device; the radio frequency device is also used to connect to the host computer.

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