An RFID-based voltage detection device and system

Abstract

The present invention discloses a power verification device and system based on RFID, which is arranged on a line or device to be detected, and includes: a capacitive electric field sensor, a conditioning circuit, and an RFID electronic tag; the capacitive electric field sensor is used to collect an electric field signal of the line or device to be detected, and generate a corresponding induced voltage according to the collected electric field signal; the conditioning circuit is used to amplify, filter, and rectify the induced voltage to obtain a comparison voltage, and perform a zero-crossing comparison on the comparison voltage, so as to output a comparison result; the RFID electronic tag is used to add tag information corresponding to the RFID electronic tag to the comparison result, and control the impedance of the antenna interface of the RFID electronic tag, so as to control the change of the impedance to change the radiation coefficient of the antenna, and further modulate the comparison result with added tag information by a carrier signal, and transmit the modulated carrier signal.

Description

Technical Field

[0001] The present invention relates to the technical field of live-line detection, and in particular, to an RFID-based live-line detection device and system. Background Art

[0002] A live-line detector is an essential safety tool for live-line work in the power system. Among them, a high-voltage live-line detector is a special tool for detecting whether high-voltage power equipment is energized, which is of great significance for ensuring the personal safety of staff during power outage maintenance.

[0003] Common high-voltage live-line detectors are mainly divided into contact type and induction type. When the contact type high-voltage live-line detector is used for live-line detection, electron transfer will occur, that is, electrons on the energized conductor will transfer to the live-line detector. The operator needs a guardian, and it must be noted that its rated voltage should be compatible with the voltage level of the electrical equipment to be measured, otherwise it may endanger the personal safety of the operator or cause misjudgment. During live-line detection, the operator is required to wear insulating gloves and insulating boots for insulation protection to prevent step voltage or touch voltage from harming the human body, resulting in a relatively complex operation process. Therefore, the contact type high-voltage live-line detector has certain risks. The induction type high-voltage live-line detector can avoid contact, but when detecting densely distributed wires, it is easy to cause signal interference and confuse the detection information. The above live-line detection devices are all directly worn by the staff, and an alarm is issued before contacting the energized equipment. If the device gives a false alarm, it will pose a threat to the personal safety of the staff; and some operators pursue convenient operation and often do not wear it according to the regulations, which is also prone to safety accidents.

[0004] Therefore, there is an urgent need for a live-line detection device that can avoid signal interference and information confusion and reduce the complexity of the operation of the staff. Summary of the Invention

[0005] The present invention provides an RFID-based live-line detection device and system to solve the technical problems of easy signal interference and information confusion and complex operation of the staff in the prior art.

[0006] To solve the above technical problems, an embodiment of the present invention provides an RFID-based live-line detection device, which is arranged on the line or equipment to be detected and includes: a capacitive electric field sensor, a conditioning circuit, and an RFID electronic tag;

[0007] The capacitive electric field sensor is used to collect the electric field signal of the line or equipment to be detected, and generate a corresponding induced voltage according to the collected electric field signal;

[0008] The conditioning circuit is used to amplify, filter, and rectify the induced voltage to obtain a comparison voltage, and perform a zero-crossing comparison on the comparison voltage according to a preset reference voltage, so as to output a comparison result;

[0009] The RFID electronic tag is used to add tag information corresponding to the RFID electronic tag to the comparison result, and control the impedance of the antenna interface of the RFID electronic tag, so as to control the change of the impedance to change the radiation coefficient of the antenna, and then modulate the carrier signal for the comparison result with added tag information, and transmit the modulated carrier signal; wherein, the carrier signal is the signal modulated by the comparison result with added tag information.

[0010] As a preferred solution, the capacitive electric field sensor includes a sensor structure and a sampling capacitor;

[0011] The sensor structure includes an upper plate, a lower plate, and an insulating medium embedded between the upper plate and the lower plate; the upper plate is connected to the first end of the sampling capacitor; the lower plate is grounded and connected to the second end of the sampling capacitor;

[0012] The first port of the capacitive electric field sensor is connected to the first input end of the conditioning circuit, and the second port of the capacitive electric field sensor is connected to the second output end of the conditioning circuit.

[0013] As a preferred solution, generating a corresponding induced voltage according to the collected electric field signal is specifically:

[0014] According to the collected electric field signal, as well as the dielectric constant of the insulating medium in the capacitive electric field sensor, the parameters of the capacitive electric field sensor, the capacitance value of the sampling capacitor, and the capacitance value of the sensor structure, calculate and generate a corresponding induced current:

[0015]

[0016] Q = ∫σdS = kεES

[0017] wherein, U is the induced voltage, ε is the dielectric constant of the insulating medium, E is the electric field signal, C x is the capacitance value of the sensor structure, k is the correction coefficient, C n is the capacitance value of the sampling capacitor, Q is the induced charge quantity, σ is the surface charge density, S is the effective area of the upper plate and the lower plate; the parameters of the capacitive electric field sensor include: the effective area of the upper plate and the lower plate, the surface charge density, and the induced charge quantity.

[0018] As a preferred solution, amplify, filter, and rectify the induced voltage to obtain a comparison voltage, and perform a zero-crossing comparison on the comparison voltage according to a preset reference voltage, so as to output a comparison result, specifically:

[0019] Suppress the common-mode interference signal of the induced voltage through a differential amplifier circuit, and amplify the differential-mode component in the induced voltage after suppression to obtain an amplified voltage;

[0020] Filter the interference signal in the amplified voltage, and rectify the amplified voltage after filtering to obtain an induced rectified voltage;

[0021] Perform a zero-crossing comparison on the induced rectified voltage according to a preset reference voltage;

[0022] When the induced rectified voltage is greater than the preset reference voltage, generate a first digital signal;

[0023] When the induced rectified voltage is not greater than the preset reference voltage and greater than 0, generate a second digital signal;

[0024] When the induced rectified voltage is equal to 0, generate a third digital signal.

[0025] As a preferred solution, add the tag information corresponding to the RFID electronic tag to the comparison result, and control the impedance of the antenna interface of the RFID electronic tag, so as to control the change of the impedance to change the radiation coefficient of the antenna. Specifically:

[0026] Add the tag information of the RFID electronic tag to the comparison result to obtain the power verification data; wherein, the comparison result is the first digital signal, the second digital signal or the third digital signal;

[0027] If the comparison result in the power verification data is the first digital signal, control the impedance of the antenna interface of the RFID electronic tag to be within a first preset range, so that the radiation coefficient of the antenna changes according to the impedance until the magnitude of the radiation coefficient tends to a first stable value;

[0028] If the comparison result in the power verification data is the second digital signal, control the impedance of the antenna interface of the RFID electronic tag to be within a second preset range, so that the radiation coefficient of the antenna changes according to the impedance until the magnitude of the radiation coefficient tends to a second stable value;

[0029] If the comparison result in the power verification data is the third digital signal, control the impedance of the antenna interface of the RFID electronic tag to be within a third preset range, so that the radiation coefficient of the antenna changes according to the impedance until the magnitude of the radiation coefficient tends to a third stable value.

[0030] As a preferred solution, modulate the comparison result with added tag information by a carrier signal, and transmit the modulated carrier signal. Specifically:

[0031] Modulate the power-on detection data according to the magnitude of the radiation coefficient;

[0032] If the radiation coefficient is at the first stable value, modulate the power-on detection data with a first carrier signal and transmit the first carrier signal, so that after the receiving terminal receives the first carrier signal, a high-voltage danger alarm signal is generated and the value of the induced rectified voltage is displayed;

[0033] If the radiation coefficient is at the second stable value, modulate the power-on detection data with a second carrier signal and transmit the second carrier signal, so that after the receiving terminal receives the second carrier signal, a low-voltage alarm signal is generated and the value of the induced rectified voltage is displayed;

[0034] If the radiation coefficient is at the third stable value, modulate the power-on detection data with a third carrier signal and transmit the third carrier signal, so that after the receiving terminal receives the third carrier signal, a safety signal is generated and it is displayed that the induced rectified voltage is zero.

[0035] As a preferred solution, the RFID electronic tag is further configured to:

[0036] Obtain the induced voltage after amplification, filtering and rectification in the conditioning circuit to obtain a radio frequency voltage;

[0037] Perform second rectification on the obtained radio frequency voltage and store the radio frequency voltage through an energy storage capacitor;

[0038] When the stored radio frequency voltage reaches a preset startup voltage, activate the normal operation of the RFID electronic tag.

[0039] Correspondingly, the present invention further provides an RFID-based power-on detection system, including: a receiving terminal and a plurality of RFID-based power-on detection devices as described in any one of the above;

[0040] The receiving terminal is configured to receive the carrier signal transmitted by the power-on detection device and generate a corresponding indication signal according to the carrier signal; the indication signal includes: a high-voltage danger alarm signal, a low-voltage alarm signal and a safety signal.

[0041] As a preferred solution, receiving the carrier signal transmitted by the power-on detection device and generating a corresponding indication signal according to the carrier signal specifically includes:

[0042] When receiving the first carrier signal transmitted by the power-on detection device, generate a high-voltage danger alarm signal and display the value of the induced rectified voltage;

[0043] When receiving the second carrier signal transmitted by the electrical testing device, a low voltage alarm signal is generated and the value of the induced rectified voltage is displayed;

[0044] When the third carrier signal transmitted by the electrical testing device is received, a safety signal is generated and the value of the induced rectified voltage is displayed as 0.

[0045] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0046] The technical solution of the present invention is to be arranged on the line or equipment to be detected, and to realize accurate collection of electric field signals of the line or equipment to be detected through a capacitive electric field sensor, thereby generating a corresponding induced voltage, and then amplifying, filtering and rectifying the induced voltage through a conditioning circuit to avoid confusion of the test signal and signal interference, and at the same time perform zero-crossing comparison on the obtained comparison voltage, output the comparison result, and realize adding the tag information of the comparison result through the RFID electronic tag, and then control the impedance of the antenna interface of the RFID electronic tag to change the antenna radiation coefficient, and avoid confusion of the test and information confusion caused by the presence of multiple objects to be tested. The test device arranged on the line or equipment does not require the staff to carry other equipment related to the test and wear safety protection equipment, etc., thereby reducing the complexity of the staff's operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 : A schematic diagram of the structure of an RFID-based electrical testing device provided in an embodiment of the present invention;

[0048] Figure 2 : A schematic diagram of the structure of a capacitive electric field sensor provided in an embodiment of the present invention;

[0049] Figure 3 : A schematic diagram of the structure of an RFID-based electrical inspection system provided in an embodiment of the present invention;

[0050] The reference numerals of the drawings in the specification are as follows:

[0051] Capacitive electric field sensor 1, conditioning circuit 2, RFID electronic tag 3, sensor structure 11, upper plate 111, insulating medium 112, lower plate 113, sampling capacitor 12, electrical testing device 01, receiving terminal 02. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0053] Embodiment 1

[0054] Please refer to Figure 1 , a power verification device based on RFID provided by an embodiment of the present invention, is arranged on a line or device to be detected, and includes: a capacitive electric field sensor 1, a conditioning circuit 2, and an RFID electronic tag 3.

[0055] In this embodiment, when the passive power verification device 01 is arranged on the line or device to be detected, it is not necessary for the staff to climb the electric tower or pole, which provides safety protection for the staff. At the same time, the passive power verification device 01 can directly detect the energized state of the line or device to be detected, without the staff using contact or inductive devices to detect, and only need to read the signal emitted by the passive power verification device 01.

[0056] The capacitive electric field sensor 1 is used to collect the electric field signal of the line or device to be detected, and generate a corresponding induced voltage according to the collected electric field signal.

[0057] As a preferred solution of this embodiment, the capacitive electric field sensor 1 includes a sensor structure 11 and a sampling capacitor 12; the sensor structure 11 includes an upper plate 111, a lower plate 113, and an insulating medium 112 embedded between the upper plate 111 and the lower plate 113; the upper plate 111 is connected to the first end of the sampling capacitor 12; the lower plate 113 is grounded and connected to the second end of the sampling capacitor 12; the first port of the capacitive electric field sensor 1 is connected to the first input end of the conditioning circuit 2, and the second port of the capacitive electric field sensor 1 is connected to the second output end of the conditioning circuit 2.

[0058] In this embodiment, please refer to Figure 2 , the capacitive electric field sensor 1 includes a metal upper plate 111, a metal lower plate 113, and an intermediate insulating medium 112. In an electric field, the metal upper plate 111 will generate an induced charge amount, while the metal lower plate 113 is grounded, and the upper and lower plates 113 are connected to the sampling capacitor 12, and the collected voltage is proportional to the electric field where the sensor is located.

[0059] As a preferred solution of this embodiment, generating a corresponding induced voltage according to the collected electric field signal specifically includes:

[0060] According to the collected electric field signals, as well as the dielectric constant of the insulating medium 112 in the capacitive electric field sensor 1, the parameters of the capacitive electric field sensor 1, the capacitance value of the sampling capacitor 12, and the capacitance value of the sensor structure 11, calculate and generate the corresponding induced current:

[0061]

[0062] Q = ∫σdS = kεES

[0063] where U is the induced voltage, ε is the dielectric constant of the insulating medium, E is the electric field signal, C x is the capacitance value of the sensor structure, k is the correction coefficient, C n is the capacitance value of the sampling capacitor, Q is the induced charge quantity, σ is the surface charge density, and S is the effective area of the upper and lower plates; the parameters of the capacitive electric field sensor include: the effective area of the upper and lower plates, the surface charge density, and the induced charge quantity.

[0064] In this embodiment, according to Gauss's theorem and the measurement principle of the electric field sensor, the relationship among the sensor induced charge quantity Q, the plate effective area S, and the surface charge density σ can be expressed as Q = ∫σdS = kεES. k is the correction coefficient, and its value is related to the sensor structure 11.

[0065] It should be noted that a parasitic capacitance C x will be generated between the upper plate 111 and the lower plate 113 of the capacitive electric field sensor 1, which is only related to the sensor structure 11. Usually, a sampling capacitor 12C n is connected across the sensor, and the voltage U across C n is collected as the output of the induced voltage. The sensor output voltage is proportional to the electric field strength at the measurement point. Among them, C x is at the pF level, and C n is at the nF level. Since they are not in the same order of magnitude, the influence of C x on the actual measurement can be ignored.

[0066] The conditioning circuit 2 is configured to amplify, filter, and rectify the induced voltage to obtain a comparison voltage, and perform a zero-crossing comparison on the comparison voltage according to a preset reference voltage, thereby outputting a comparison result.

[0067] As a preferred solution of this embodiment, amplifying, filtering, and rectifying the induced voltage to obtain a comparison voltage, and performing a zero-crossing comparison on the comparison voltage according to a preset reference voltage, thereby outputting a comparison result, specifically:

[0068] Through a differential amplifier circuit, the common-mode interference signal of the induced voltage is suppressed, and the differential-mode component in the suppressed induced voltage is amplified to obtain an amplified voltage; the interference signal in the amplified voltage is filtered, and the amplified voltage after filtering is rectified to obtain an induced rectified voltage; according to a preset reference voltage, a zero-crossing comparison is performed on the induced rectified voltage; when the induced rectified voltage is greater than the preset reference voltage, a first digital signal is generated; when the induced rectified voltage is not greater than the preset reference voltage and greater than 0, a second digital signal is generated; when the induced rectified voltage is equal to 0, a third digital signal is generated.

[0069] In this embodiment, the capacitive electric field sensor 1 uses the principle of electrostatic induction to collect electric field signals. Due to the size limitation of the induction electrode plate, the induced charge generated on the upper electrode plate 111 of the sensor is less, and the induced voltage generated between the two electrode plates is relatively weak. Therefore, it is necessary to amplify it. During measurement, the disturbance amounts generated by the interference signals in the environment on the two electrodes of the sensor are the same, which is a common-mode interference. The differential amplifier circuit can effectively suppress this common-mode interference signal and amplify the differential-mode component between the two electrodes of the sensor, that is, the electric field signal output by the sensor. Therefore, the differential amplifier circuit can not only amplify the output signal of the sensor, but also effectively suppress the electromagnetic interference signal in the measurement site. Preferably, the amplifier uses an AD620 instrument for differential amplification to eliminate common-mode interference.

[0070] Furthermore, the filter uses a multi-feedback second-order active low-pass filter to suppress the interference components in the signal. In the design of the filter, filter capacitor and resistor parameters with higher precision are selected to ensure that the amplitude-frequency characteristics of the filter circuits of multiple sensor channels are strictly consistent. The induced voltage of the capacitive electric field sensor 1 is amplified, filtered, and rectified and then sent to a voltage comparator. The voltage comparator selects a zero-crossing comparator for zero-crossing comparison, and outputs the comparison result to the electronic tag.

[0071] In this embodiment, the preset reference voltage can be the lowest voltage that the human body can withstand, or the lowest voltage that can be withstand after wearing protective equipment, and can be set according to the actual situation. When the induced rectified voltage is greater than the preset reference voltage, it means that the line or equipment is energized and the voltage is relatively high; when the induced rectified voltage is not greater than the preset reference voltage and greater than 0, it means that the human body can directly contact the line or equipment or can contact the line or equipment after wearing protective equipment; when the induced rectified voltage is equal to 0, it means that the staff can directly contact the line or equipment, and the line or equipment is not energized.

[0072] The RFID electronic tag 3 is used to add tag information corresponding to the RFID electronic tag 3 to the comparison result, and control the impedance of the antenna interface of the RFID electronic tag 3, so as to control the change of the impedance to change the radiation coefficient of the antenna, and then modulate the comparison result with added tag information by a carrier signal, and transmit the modulated carrier signal; wherein, the carrier signal is the signal modulated by the comparison result with added tag information.

[0073] As a preferred solution of this embodiment, adding the tag information corresponding to the RFID electronic tag 3 to the comparison result and controlling the impedance of the antenna interface of the RFID electronic tag 3, so as to control the change of the impedance to change the radiation coefficient of the antenna, specifically:

[0074] Add the tag information of the RFID electronic tag 3 to the comparison result to obtain the power verification data; wherein, the comparison result is the first digital signal, the second digital signal or the third digital signal; if the comparison result in the power verification data is the first digital signal, control the impedance of the antenna interface of the RFID electronic tag 3 to be within the first preset range, so that the radiation coefficient of the antenna changes according to the impedance until the magnitude of the radiation coefficient tends to a first stable value; if the comparison result in the power verification data is the second digital signal, control the impedance of the antenna interface of the RFID electronic tag 3 to be within the second preset range, so that the radiation coefficient of the antenna changes according to the impedance until the magnitude of the radiation coefficient tends to a second stable value; if the comparison result in the power verification data is the third digital signal, control the impedance of the antenna interface of the RFID electronic tag 3 to be within the third preset range, so that the radiation coefficient of the antenna changes according to the impedance until the magnitude of the radiation coefficient tends to a third stable value.

[0075] In this embodiment, adding the tag information of the RFID electronic tag 3 to the comparison result can make the signal emitted by the RFID electronic tag 3 belong to the RFID electronic tag 3, so as to realize that when there are multiple objects to be measured, since the electronic tag has an ID, there will be no power verification confusion.

[0076] Further, the way for the RFID electronic tag to return data is to control the impedance of the antenna interface. The reflection coefficient of the antenna is changed by the impedance change, so as to complete the modulation of the carrier signal. By the first digital signal, the second digital signal or the third digital signal in the power inspection data, the impedance of the antenna interface of the RFID electronic tag 3 can be controlled, so that the impedance of the antenna interface is within the first preset range, the second preset range or the third preset range. Thus, the radiation coefficient of the antenna changes with the change of the impedance magnitude, resulting in the change of the radio frequency signal frequency of the antenna, etc., so as to realize the transmission, identification and alarm of the power inspection data in different situations at the modulation signal level.

[0077] As a preferred solution of this embodiment, the modulation of the carrier signal on the comparison result of adding tag information and the emission of the modulated carrier signal are specifically as follows:

[0078] Modulate the power inspection data according to the magnitude of the radiation coefficient; if the radiation coefficient is at the first stable value, modulate the power inspection data with the first carrier signal and emit the first carrier signal, so that after the receiving terminal 02 receives the first carrier signal, a high-voltage danger alarm signal is generated and the value of the induced rectified voltage is displayed; if the radiation coefficient is at the second stable value, modulate the power inspection data with the second carrier signal and emit the second carrier signal, so that after the receiving terminal 02 receives the second carrier signal, a low-voltage alarm signal is generated and the value of the induced rectified voltage is displayed; if the radiation coefficient is at the third stable value, modulate the power inspection data with the third carrier signal and emit the third carrier signal, so that after the receiving terminal 02 receives the third carrier signal, a safety signal is generated and the induced rectified voltage is displayed as zero.

[0079] In this embodiment, since the emission coefficient of the antenna changes with the change of the impedance, the carrier signals modulated by the antenna are also different. Furthermore, different carrier signals are emitted through different first digital signals, second digital signals or third digital signals, and then the receiving terminal 02 receives the emitted carrier signals to read and identify the corresponding induced rectified voltage and generate corresponding indication signals; among them, the indication signals include: high-voltage danger alarm signals, low-voltage alarm signals and safety signals, which are used to intuitively let the staff identify whether the line or equipment to be detected is energized.

[0080] As a preferred solution, the RFID electronic tag 3 is further used for:

[0081] The induced voltage after amplification, filtering and rectification in the conditioning circuit 2 is acquired to obtain a radio frequency voltage; the acquired radio frequency voltage is subjected to a second rectification, and the radio frequency voltage is stored in an energy storage capacitor; when the stored radio frequency voltage reaches a preset starting voltage, the normal operation of the RFID electronic tag 3 is activated.

[0082] In this embodiment, the RFID electronic tag 3 can also be used to implement a passive electrical detection method by obtaining the induced voltage after amplification, filtering and rectification in the conditioning circuit 2, thereby providing the RFID electronic tag 3 with a normal operating voltage.

[0083] As another preferred solution, the RFID electronic tag 3 also includes a radio frequency front-end receiving circuit, a digital logic control module and a memory, so that the radio frequency front-end receiving circuit obtains energy from the electromagnetic field generated when identifying from the receiving terminal 02, and then converts the electromagnetic field radio frequency energy into a DC power supply by a rectification method, and stores the DC power supply through the memory (large capacitor). When the accumulated voltage reaches the starting working voltage, the digital logic control module activates the circuit used for electrical testing of the RFID electronic tag 3, and then works normally and transmits electrical testing data.

[0084] Implementing the above embodiments has the following effects:

[0085] The technical solution of the present invention is to be arranged on the line or equipment to be detected, and to realize accurate collection of electric field signals of the line or equipment to be detected through a capacitive electric field sensor, thereby generating a corresponding induced voltage, and then amplifying, filtering and rectifying the induced voltage through a conditioning circuit to avoid confusion of the test signal and signal interference, and at the same time perform zero-crossing comparison on the obtained comparison voltage, output the comparison result, and realize adding the tag information of the comparison result through the RFID electronic tag, and then control the impedance of the antenna interface of the RFID electronic tag to change the antenna radiation coefficient, and avoid confusion of the test and information confusion caused by the presence of multiple objects to be tested. The test device arranged on the line or equipment does not require the staff to carry other equipment related to the test and wear safety protection equipment, etc., thereby reducing the complexity of the staff's operation.

[0086] Embodiment 2

[0087] See also Figure 3 The present invention further provides an RFID-based electricity testing system, comprising: a receiving terminal 02 and a plurality of RFID-based electricity testing devices 01 as described in the first embodiment above.

[0088] The receiving terminal 02 is configured to receive the carrier signal transmitted by the live-line voltage detector 01, and generate a corresponding indication signal according to the carrier signal; the indication signal includes: a high-voltage danger alarm signal, a low-voltage alarm signal, and a safety signal.

[0089] As a preferred solution of this embodiment, receiving the carrier signal transmitted by the live-line voltage detector 01 and generating a corresponding indication signal according to the carrier signal specifically includes:

[0090] When receiving the first carrier signal transmitted by the live-line voltage detector 01, a high-voltage danger alarm signal is generated, and the value of the induced rectified voltage is displayed; when receiving the second carrier signal transmitted by the live-line voltage detector 01, a low-voltage alarm signal is generated, and the value of the induced rectified voltage is displayed; when receiving the third carrier signal transmitted by the live-line voltage detector 01, a safety signal is generated, and the value of the induced rectified voltage is displayed as 0.

[0091] In this embodiment, the receiving terminal 02 can be a handheld device for the staff. Therefore, the staff only needs to receive the carrier signal transmitted by the live-line voltage detector 01 to generate a corresponding indication signal and display the corresponding live-line voltage detection data.

[0092] In this embodiment, a passive charging module is also provided inside the receiving terminal 02, which includes a radio frequency front-end receiving circuit and a memory. The radio frequency front-end receiving circuit obtains energy from the electromagnetic field generated during the acquisition and identification of the live-line voltage detector, and then converts the electromagnetic field radio frequency energy into a DC power supply by rectification, and stores the DC power supply through the memory (large capacitor).

[0093] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the above-described RFID-based live-line voltage detector can refer to the corresponding process in the first foregoing embodiment, and will not be elaborated herein.

[0094] Compared with the prior art, the embodiment of the present invention has the following beneficial effects:

[0095] The technical solution of the present invention is to be arranged on the line or equipment to be detected, and to realize accurate collection of electric field signals of the line or equipment to be detected through a capacitive electric field sensor, thereby generating a corresponding induced voltage, and then amplifying, filtering and rectifying the induced voltage through a conditioning circuit to avoid confusion of the test signal and signal interference, and at the same time perform zero-crossing comparison on the obtained comparison voltage, output the comparison result, and realize adding the tag information of the comparison result through the RFID electronic tag, and then control the impedance of the antenna interface of the RFID electronic tag to change the antenna radiation coefficient, and avoid confusion of the test and information confusion caused by the presence of multiple objects to be tested. The test device arranged on the line or equipment does not require the staff to carry other equipment related to the test and wear safety protection equipment, etc., thereby reducing the complexity of the staff's operation.

[0096] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric voltage detecting device based on RFID, characterized in that, it is arranged on the line or equipment to be detected, and includes: a capacitive electric field sensor, a conditioning circuit and an RFID electronic tag; the capacitive electric field sensor is used to collect the electric field signal of the line or equipment to be detected, and generate a corresponding induced voltage according to the collected electric field signal; the conditioning circuit is used to amplify, filter and rectify the induced voltage to obtain a comparison voltage, and perform a zero-crossing comparison on the comparison voltage according to a preset reference voltage, so as to output a comparison result; wherein, amplifying, filtering and rectifying the induced voltage to obtain a comparison voltage, and performing a zero-crossing comparison on the comparison voltage according to a preset reference voltage, so as to output a comparison result, specifically: suppress the common-mode interference signal of the induced voltage through a differential amplifier circuit, and amplify the differential-mode component in the suppressed induced voltage to obtain an amplified voltage; filter the interference signal in the amplified voltage, and rectify the filtered amplified voltage to obtain an induced rectified voltage; perform a zero-crossing comparison on the induced rectified voltage according to a preset reference voltage; when the induced rectified voltage is greater than the preset reference voltage, generate a first digital signal; when the induced rectified voltage is not greater than the preset reference voltage and greater than 0, generate a second digital signal; when the induced rectified voltage is equal to 0, generate a third digital signal; the RFID electronic tag is used to add the tag information corresponding to the RFID electronic tag to the comparison result, and control the impedance of the antenna interface of the RFID electronic tag, so as to control the change of the impedance to change the radiation coefficient of the antenna, and then modulate the comparison result with added tag information by a carrier signal, and transmit the modulated carrier signal; wherein, the carrier signal is a signal modulated by the comparison result with added tag information; wherein, adding the tag information corresponding to the RFID electronic tag to the comparison result, and controlling the impedance of the antenna interface of the RFID electronic tag, so as to control the change of the impedance to change the radiation coefficient of the antenna, specifically: Add the tag information of the RFID electronic tag to the comparison result to obtain the power verification data; wherein, the comparison result is the first digital signal, the second digital signal, or the third digital signal; if the comparison result in the power verification data is the first digital signal, control the impedance of the antenna interface of the RFID electronic tag to be within a first preset range, so that the radiation coefficient of the antenna changes according to the impedance until the magnitude of the radiation coefficient tends to a first stable value; if the comparison result in the power verification data is the second digital signal, control the impedance of the antenna interface of the RFID electronic tag to be within a second preset range, so that the radiation coefficient of the antenna changes according to the impedance until the magnitude of the radiation coefficient tends to a second stable value; if the comparison result in the power verification data is the third digital signal, control the impedance of the antenna interface of the RFID electronic tag to be within a third preset range, so that the radiation coefficient of the antenna changes according to the impedance until the magnitude of the radiation coefficient tends to a third stable value.

2. The power verification device based on RFID according to claim 1, characterized in that, the capacitive electric field sensor includes a sensor structure and a sampling capacitor; the sensor structure includes an upper plate, a lower plate, and an insulating medium embedded between the upper plate and the lower plate; the upper plate is connected to the first end of the sampling capacitor; the lower plate is grounded and connected to the second end of the sampling capacitor; the first port of the capacitive electric field sensor is connected to the first input end of the conditioning circuit, and the second port of the capacitive electric field sensor is connected to the second output end of the conditioning circuit.

3. The power verification device based on RFID according to claim 2, characterized in that, generating a corresponding induced voltage according to the collected electric field signal specifically includes: calculating and generating a corresponding induced voltage according to the collected electric field signal, the dielectric constant of the insulating medium in the capacitive electric field sensor, the parameters of the capacitive electric field sensor, the capacitance value of the sampling capacitor, and the capacitance value of the sensor structure: Among them, is the induced voltage, is the dielectric constant of the insulating medium, is the electric field signal, is the capacitance value of the sensor structure, is the correction coefficient, is the capacitance value of the sampling capacitor, is the induced charge quantity, is the surface charge density, is the effective area of the upper and lower plates; the parameters of the capacitive electric field sensor include: the effective area of the upper and lower plates, the surface charge density and the induced charge quantity.

4. The power verification device based on RFID according to claim 1, characterized in that, modulating the comparison result with added tag information by a carrier signal and transmitting the modulated carrier signal specifically includes: modulating the power verification data by a carrier signal according to the magnitude of the radiation coefficient; if the radiation coefficient is at the first stable value, modulating the power verification data by a first carrier signal and transmitting the first carrier signal, so that after the receiving terminal receives the first carrier signal, a high-voltage danger alarm signal is generated and the value of the induced rectified voltage is displayed; if the radiation coefficient is at the second stable value, modulating the power verification data by a second carrier signal and transmitting the second carrier signal, so that after the receiving terminal receives the second carrier signal, a low-voltage alarm signal is generated and the value of the induced rectified voltage is displayed; If the radiation coefficient is at the third stable value, modulate the electroscope data with a third carrier signal and transmit the third carrier signal, so that after the receiving terminal receives the third carrier signal, a safety signal is generated and the induced rectified voltage is displayed as zero.

5. An electroscope device based on RFID according to claim 1, characterized in that the RFID electronic tag is further configured to: acquire the induced voltage after amplification, filtering and rectification in the conditioning circuit to obtain a radio frequency voltage; perform second rectification on the acquired radio frequency voltage and store the radio frequency voltage through an energy storage capacitor; when the stored radio frequency voltage reaches a preset start voltage, activate the normal operation of the RFID electronic tag.

6. An electroscope system based on RFID, characterized in that it includes: a receiving terminal and a plurality of electroscope devices based on RFID according to any one of claims 1-5; the receiving terminal is configured to receive the carrier signal transmitted by the electroscope device and generate a corresponding indication signal according to the carrier signal; the indication signal includes: a high voltage danger alarm signal, a low voltage alarm signal and a safety signal.

7. An electroscope system based on RFID according to claim 6, characterized in that receiving the carrier signal transmitted by the electroscope device and generating a corresponding indication signal according to the carrier signal, specifically: when receiving the first carrier signal transmitted by the electroscope device, generate a high voltage danger alarm signal and display the value of the induced rectified voltage; when receiving the second carrier signal transmitted by the electroscope device, generate a low voltage alarm signal and display the value of the induced rectified voltage; when receiving the third carrier signal transmitted by the electroscope device, generate a safety signal and display that the value of the induced rectified voltage is 0.

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