CN117676375A

CN117676375A - RFID chip switching circuit

Info

Publication number: CN117676375A
Application number: CN202311516953.9A
Authority: CN
Inventors: 佟欣欣
Original assignee: Zhuhai Yunwang Technology Co ltd
Current assignee: Zhuhai Yunwang Technology Co ltd
Priority date: 2023-11-15
Filing date: 2023-11-15
Publication date: 2024-03-08

Abstract

The invention discloses and provides an RFID chip switching circuit with the characteristics of being passive, ultra-low in power consumption, free of maintenance and the like, which judges whether a lock, a door, a switch handle, a knob switch and the like are operated in place or not through code value switching. The invention comprises an antenna, an RFID radio frequency circuit, a power supply circuit, a logic control circuit and an analog switch circuit; the RFID radio frequency circuit and the power supply circuit are electrically connected with the antenna, the RFID radio frequency circuit comprises at least one RFID chip, the power supply circuit provides power for the logic control circuit and the analog switch circuit, and the analog switch circuit is electrically connected with the RFID radio frequency circuit; the logic control circuit is used for detecting the closing or opening state of the electrical equipment, and the analog switch circuit controls the on and off of a certain RFID chip of the RFID radio frequency circuit according to the logic combination mode of the closing or opening state signals of the electrical equipment detected in the logic control circuit. The invention is applied to the technical field of electronic circuits in power systems.

Description

RFID chip switching circuit

Technical Field

The invention is applied to an electric power safety protection system in the fields of petroleum, petrochemical industry, refining, oil fields and the like, and particularly relates to the technical field of electronic circuits in an electric power system.

Background

The accident is more frequent and the consequences are serious in the electric safety protection system in the fields of petroleum, petrochemical industry, refining, oil fields and the like. Such as accidents caused by failure of electrical energy isolation, it is transient and extremely dangerous. Similar accident cases occur in almost all large-scale central enterprises and national enterprises in the industrial field. In order to prevent such accidents, locking and hanging systems are widely implemented, but the accidents are not fundamentally stopped. When many maintenance operators are involved, once accidents occur, casualties often accompany, and the common reasons are as follows: 1. the locking and hanging card is not executed, and the equipment to be operated is mistakenly shut down without any reason; 2. the locking and listing are executed, but a plurality of equipment overhauls are carried out at the same time, the electricity of equipment which is not finished is sent by an electrical operator after the application of power transmission is finished for some equipment overhauls; 3. the locking and listing is performed, but the overhaul involves a plurality of teams, one team considers that the overhaul has finished applying for power transmission, and other teams still work on the equipment.

From the above, the conventional mechanical locks used in the locking and listing system have the following disadvantages:

the isolation locking process has insufficient logic authority management and control. The mechanical lockset can not strictly carry out the authorization and the authority release of the unlocking and locking operation according to the isolation locking process, and the misoperation of the lockset caused by the improper management of a mechanical key can cause the incomplete execution of the isolation locking management and control program.

2. The isolated lock state cannot be monitored in real time. The mechanical lockset is lack of effective process locking record, the on-site isolation locking operation information and the locking state cannot be monitored in real time, and effective statistical analysis and process tracing cannot be performed.

3. The lock and the key are difficult to be used, stored and recycled. For the condition of more isolation points in the large overhaul operation process, the quantity of locks and keys is large, and the picking, storage and recovery management are complex and complicated.

4. The informatization degree of the control process is not high. The mechanical lockset operation information and the locking state cannot interact with systems such as operation license management and the like, cannot share with operation security analysis (JSA) results, and cannot realize integrated management and control of inspection and maintenance operation security risks.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects of the prior art, and provides an RFID chip switching circuit with the characteristics of being passive, ultra-low in power consumption, free of maintenance and the like.

The technical scheme adopted by the invention is as follows: the invention comprises an antenna 1, an RFID radio frequency circuit 2, a power circuit 3, a logic control circuit 4 and an analog switch circuit 5; the RFID radio frequency circuit 2 and the power supply circuit 3 are electrically connected with the antenna 1, the RFID radio frequency circuit 2 comprises at least one RFID chip, the power supply circuit 3 provides power for the logic control circuit 4 and the analog switch circuit 5, and the analog switch circuit 5 is electrically connected with the RFID radio frequency circuit 2; the logic control circuit 4 is configured to detect a closed or open state of an electrical device, the analog switch circuit 5 controls a circuit of an RFID chip of the RFID radio frequency circuit 2 to be turned on or off according to a logic combination manner of signals of the closed or open state of each electrical device detected in the logic control circuit 4, an external device reads data of the RFID chip through the antenna 1 to determine the closed or open state of the electrical device, and the power circuit 3 also forms mutual inductance with the external device to obtain electric energy through the antenna 1.

Further, the antenna 1 adopts an RFID radio frequency technology, the antenna 1 and an external device form mutual inductance, and the antenna 1 is a power source of the power circuit 3.

Further, the RFID radio frequency circuit 2 includes at least one RFID chip, each RFID chip includes an EPROM, and the EPROM can be burned into a logic code value for determining the state of the electrical device according to the requirement. If the bit values in front of each chip code value are consistent, only the last bit changes (0, 1,2, 3), so as to judge the state of the equipment.

Further, the power supply circuit 3 includes an LC oscillating circuit and a rectifying circuit, and rectifies by schottky diode to form a direct-current voltage, which supplies power to the logic control circuit 4 and the analog switch circuit 5.

Further, the logic control circuit 4 comprises a first magnetic control switch and a second magnetic control switch; the first magnetic control switch and the second magnetic control switch are both equipment state detection units and are used for detecting the closing or opening state of the electrical equipment and outputting a closing or opening state signal of the electrical equipment to the analog switch circuit 5.

Further, the analog switch circuit 5 controls the on/off of the circuit of a certain RFID chip according to the logic combination of the on/off state signal of the first magnetic switch and the on/off state signal of the second magnetic switch in the logic control circuit 4.

Further, the RFID radio frequency circuit 2 includes four RFID radio frequency chips.

Drawings

FIG. 1 is a functional block diagram of the present invention;

FIG. 2 is a circuit diagram of the present invention;

fig. 3 is a circuit diagram of the antenna 1;

fig. 4 is a circuit diagram of the RFID radio frequency circuit 2;

fig. 5 is a circuit diagram of the power supply circuit 3;

fig. 6 is a circuit diagram of the logic control circuit 4;

fig. 7 is a circuit diagram of the analog switch circuit 5.

Description of the embodiments

As shown in fig. 1 and 2, in the present embodiment, the present invention includes an antenna 1, an RFID radio frequency circuit 2, a power supply circuit 3, a logic control circuit 4, and an analog switch circuit 5; the RFID radio frequency circuit 2 and the power supply circuit 3 are electrically connected with the antenna 1, the RFID radio frequency circuit 2 comprises four RFID chips, the power supply circuit 3 provides power for the logic control circuit 4 and the analog switch circuit 5, and the analog switch circuit 5 is electrically connected with the RFID radio frequency circuit 2; the logic control circuit 4 is configured to detect a closed or open state of an electrical device, the analog switch circuit 5 controls a circuit of an RFID chip of the RFID radio frequency circuit 2 to be turned on or off according to a logic combination manner of signals of the closed or open state of each electrical device detected in the logic control circuit 4, an external device reads data of the RFID chip through the antenna 1 to determine the closed or open state of the electrical device, and the power circuit 3 also forms mutual inductance with the external device to obtain electric energy through the antenna 1.

In this embodiment, as shown in fig. 3, the antenna 1 adopts an RFID radio frequency technology, the antenna 1 and an external device form mutual inductance, and the antenna 1 is a power source of the power circuit 3.

As shown in fig. 4, in this embodiment, the RFID radio frequency circuit 2 includes four RFID chips, each of which includes an EPROM, and can be burned to determine the logic code value of the state of the electrical device according to the requirement. If the bit values in front of each chip code value are consistent, only the last bit changes (0, 1,2, 3), so as to judge the state of the equipment.

As shown in fig. 5, in the present embodiment, the power supply circuit 3 includes an LC oscillating circuit and a rectifying circuit, and rectifies by schottky diodes to form a dc voltage, and supplies power to the logic control circuit 4 and the analog switch circuit 5.

As shown in fig. 6, in the present embodiment, the logic control circuit 4 includes a first magnetic control switch and a second magnetic control switch; the first magnetic control switch and the second magnetic control switch are both equipment state detection units and are used for detecting the closing or opening state of the electrical equipment and outputting a closing or opening state signal of the electrical equipment to the analog switch circuit 5.

As shown in fig. 7, in the present embodiment, the analog switch circuit 5 controls the on/off of a circuit of a certain RFID chip according to a logic combination of the on/off state signal of the first magnetic switch and the on/off state signal of the second magnetic switch in the logic control circuit 4.

In this embodiment, four RFID chips in the present circuit are burned with a code value, respectively, and the four code values represent a logic relationship: device 1 is open and device 2 is open, device 1 is closed and device 2 is open, device 1 is open and device 2 is closed, device 1 is closed and device 2 is closed.

IN the embodiment, as shown IN fig. 1 to 7, IN the schematic diagram, F1 is an antenna, two ends of the antenna are respectively represented by a network rfid_in1, the network rfid_in2 (two ends of the antenna are nonpolar and can be randomly exchanged during welding), the network rfid_in1 is divided into two paths, one path enters an RFID chip, the other path enters a capacitor C3, the capacitor C3 and F1 form an LC oscillating circuit (a resonance point is matched with a frequency point of an external device as much as possible to obtain maximum energy), and a D1 and D2 schottky diodes rectify to obtain a direct current voltage, and the VCC voltage value is controlled within 5.5V through a D3 zener diode to provide a logic circuit and simulate a switching circuit power supply.

IN this embodiment, VCC is provided with a power supply T3 (first magnetic switch) and T2 (second magnetic switch) by R11 and R10 respectively, when T3 is turned on, the network suo_in is at a high level (1), and is debounced by a capacitor C6, and enters analog switch circuits U2 and U5, and when T3 is turned off, the network suo_in is at a low level (0); when T2 is turned on, the network men_in is at a high level (1), and is debounced by the capacitor C5, and enters the analog switch circuits U2, U5, and when T2 is turned off, the network men_in is at a low level (0).

IN this embodiment, VCC provides an analog switch circuit U2, U5 power supply, U2, U5 is an analog switch IC, network men_in, and network suo_in are combined to form 4 groups of logic (00, 01,10, 11), so as to control network CT1, network CT2, network CT3, and network CT4, R1 and R6, R2 and R7 are network men_in, and network suo_in pull-down resistors, ensuring that network men_in, network suo_in is low before being turned on, and when network men_in and network suo_in are both turned on, network CT4 is connected to network rfid_in2 through R9, and RFID chip U6 begins to operate; when the network MEN_IN is on and the network SUO_IN is off, the network CT3 is communicated with the network RFID_In2 through R8, and the RFID chip U4 starts to work; when the network MEN_IN is disconnected and the network SUO_IN is conducted, the network CT2 is communicated with the network RFID_In2 through R5, and the RFID chip U3 starts to work; when the network men_in is disconnected and the network suo_in is disconnected, the network CT1 is connected to the network rfid_in2 via R4, and the RFID chip U1 starts to operate.

The logical relationship between U2 and U5 is as follows:

u1, U3, U4, U6 are RFID chips, EPROM is contained IN the chips, the RFID value can be repeatedly burnt IN, when the network CT1 is communicated with the network RFID_In2, U1 works, and the RFID value 1 is transmitted out through an F1 antenna; when the network CT2 is communicated with the network RFID_In2, the U3 works, and the RFID value 2 is transmitted out through the F1 antenna; when the network CT3 is communicated with the network RFID_In2, the U4 works, and the RFID value 3 is transmitted out through the F1 antenna; when network CT4 is IN communication with network RFID_In2, U6 is operative to transmit RFID value 4 via the F1 antenna.

The scheme is that four RFID chip switching circuits have the characteristics of being passive, ultra-low in power consumption, free of maintenance and the like, whether locks, doors, switch handles, knob switches and the like are operated in place or not is judged on software through code value switching, and operation steps of operators are monitored more specifically, so that misoperation of the operators to equipment is avoided more. The circuit is simple, the cost is low, the drawing board area can be smaller than 4 square centimeters, and the circuit can be widely applied to products such as ring main units, locks, knob switches, switch handles, ground piles and the like in the fields of electric power, petroleum and petrochemical industry and the like, and compared with the prior art, the circuit has the following advantages: 1. the code value can be modified, and a set of data with logic relation can be changed according to the internal software specifications of the company; 2. the state of two devices, such as a ground wire pile, can be monitored simultaneously, and by adopting the circuit, the unlocking can be realized, and whether the ground wire is hung in place or not can be monitored, so that safety accidents are avoided more, and the prior art can only realize the unlocking step; 3. the operation steps of operators can be specifically tracked, and corresponding records are formed and returned to the background server.

While the embodiments of this invention have been described in terms of practical aspects, they are not to be construed as limiting the meaning of this invention, and modifications to the embodiments and combinations with other aspects thereof will be apparent to those skilled in the art from this description.

Claims

An rfid chip switching circuit, characterized by: the RFID chip switching circuit comprises an antenna (1), an RFID radio frequency circuit (2), a power supply circuit (3), a logic control circuit (4) and an analog switch circuit (5); the RFID radio frequency circuit (2) and the power supply circuit (3) are electrically connected with the antenna (1), the RFID radio frequency circuit (2) comprises at least one RFID chip, the power supply circuit (3) provides power for the logic control circuit (4) and the analog switch circuit (5), and the analog switch circuit (5) is electrically connected with the RFID radio frequency circuit (2); the logic control circuit (4) is used for detecting the closing or opening state of the electrical equipment, the analog switch circuit (5) controls the on and off of a circuit of a certain RFID chip of the RFID radio frequency circuit (2) according to a logic combination mode of the closing or opening state signals of the electrical equipment detected in the logic control circuit (4), the external equipment reads data of the certain RFID chip through the antenna (1) to judge the closing or opening state of the electrical equipment, and meanwhile, the power supply circuit (3) also forms mutual inductance with the external equipment to obtain electric energy through the antenna (1).
2. The RFID chip switching circuit of claim 1, wherein: the antenna (1) adopts an RFID radio frequency technology, the antenna (1) and an external device form mutual inductance, and the antenna (1) is a power source of the power circuit (3).
3. The RFID chip switching circuit of claim 1, wherein: the RFID radio frequency circuit (2) comprises at least one RFID chip, each RFID chip contains EPROM, and the EPROM can be burned into the RFID chip according to the needs of the RFID chip to judge the electric propertyApparatus and method for controlling the operation of a device Status ofLogical code values.
4. The RFID chip switching circuit of claim 1, wherein: the power supply circuit (3) comprises an LC oscillating circuit and a rectifying circuit, and forms direct-current voltage through Schottky diode rectification to provide power for the logic control circuit (4) and the analog switch circuit (5).
5. The RFID chip switching circuit of claim 1, wherein: the logic control circuit (4) comprises a first magnetic control switch and a second magnetic control switch; the first magnetic control switch and the second magnetic control switch are equipment state detection units and are used for detecting the closing or opening state of the electrical equipment and outputting a closing or opening state signal of the electrical equipment to the analog switch circuit (5).
6. The RFID chip switching circuit of claim 5, wherein: the analog switch circuit (5) controls the on-off of the circuit of one RFID chip according to the logic combination mode of the on-or-off state signal of the first magnetic switch and the on-or-off state signal of the second magnetic switch in the logic control circuit (4).
7. An RFID chip switching circuit according to claim 1 or 3, wherein: the RFID radio frequency circuit (2) comprises four RFID radio frequency chips.