CN210742720U - Laboratory station power control system based on RFID and teaching laboratory - Google Patents

Abstract

The utility model provides a laboratory station power control system and teaching laboratory based on RFID, all include the control unit, be used for controlling the relay that switches on and breaks off of the commercial power supply line of laboratory station, be used for punching the card and control the radio frequency card that the coil of relay is circular telegram, still include memory module, button, radio frequency card reader and time-recorder; the control unit comprises a first controller and a relay driving circuit for driving the relay; the first controller drives the relay through the relay driving circuit, and a normally open contact of the relay is connected in series in the commercial power supply circuit. The utility model discloses a be used for improving laboratory station management work efficiency, improve the laboratory with electric safety. The utility model discloses a still be equipped with voltage transformer, current transformer, the special metering chip of electric energy and electric energy display screen in addition, can gather and show the electric energy information of laboratory station, help station user's power consumption safety.

Description

Laboratory station power control system based on RFID and teaching laboratory

Technical Field

The utility model relates to a laboratory field, concretely relates to laboratory station power control system and teaching laboratory based on RFID.

Background

Along with the continuous development of college education, colleges and universities attach great importance to the innovation ability, practice ability and practical ability of students, and at the moment, a laboratory becomes an important place for the students to improve the practical innovation ability, so that the effective, safe and intelligent management of the laboratory becomes an important problem.

Traditional laboratories often supply power and cut off the power for the laboratory through manual push-pull switch. However, the manual push-pull switch is easy to cause mechanical abrasion of the switch due to frequent operation, so that the switch fails and normal power supply and outage of a laboratory are affected. And school's laboratory is often more, and artifical push-and-pull switch not only has certain potential safety hazard, has still increased administrator's intensity of labour, and efficiency is lower relatively. In addition, the current laboratory often can't know station power consumption electric energy information, and station power consumption security is low relatively.

Therefore, the utility model provides a laboratory station power control system and teaching laboratory based on RFID for solve above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

Not enough to the above-mentioned of prior art, the utility model provides a laboratory station power control system and teaching laboratory based on RFID for solve above-mentioned technical problem.

In a first aspect, the utility model provides a laboratory station power control system based on RFID, this laboratory station power control system includes the control unit, is used for controlling the relay that switches on and breaks off of the commercial power supply line of laboratory station, is used for punching the card and controls the radio frequency card that the coil of relay is circular telegram, still includes memory module, is used for opening the button that RFID read the card mode, is used for with the radio frequency card reader that the radio frequency card cooperates and is used for the time-recorder of timing;

the control unit comprises a first controller and a relay driving circuit for driving the relay; wherein:

the first controller is respectively connected with the key, the timer, the storage module and the radio frequency card reader;

the first controller drives the relay through the relay driving circuit, and a normally open contact of the relay is connected in series in the commercial power supply circuit.

Further, the relay driving circuit includes a third transistor Q3, a third resistor R3, an optocoupler U10, a fourth resistor R4, and a fourth diode D4, wherein:

a first end of the third resistor R3 is connected with a control signal input line for inputting a relay control signal;

a second end of the third resistor R3 is connected with the anode of the input end of the optical coupler U10;

the cathode of the input end of the optical coupler U10 is grounded;

an emitter E of the output end of the optical coupler U10 is connected with the base of a third triode Q3;

the collector of the output end of the optocoupler U10 is connected with the first end of the fourth resistor R4;

the second end of the fourth resistor R4, the cathode of the fourth diode D4 and the first end of the coil of the relay are all connected with a VCC power supply;

the anode of the fourth diode D4 and the second end of the coil of the relay are both connected with the collector of the third triode Q3;

the emitter of the third transistor Q3 is grounded.

Further, laboratory station power control system based on RFID still includes the display screen, the control unit still include the display screen drive circuit that is used for driving the display screen, wherein: the first controller is connected with the display screen through a display screen driving circuit.

Further, the control unit (100) further comprises an RS232-USB interface converter for accessing an external computer, wherein: the external computer is connected with the first controller (101) through the RS232-USB interface converter.

Further, this laboratory station power control system is including bee calling organ and the LED pilot lamp that is used for reminding the radio frequency card to punch the card success and fail, bee calling organ and LED pilot lamp all connect on first controller.

Further, the control unit further comprises a clock circuit, and the clock circuit is connected with the first controller.

Furthermore, the display screen, the keys and the radio frequency card reader are all arranged on the laboratory station.

Further, this laboratory station power control system based on RFID still includes special measurement chip of electric energy, second controller, is used for installing be used for detecting supply voltage's voltage transformer on the mains supply circuit, be used for installing be used for detecting supply current's current transformer on the mains supply circuit and set up and be used for showing the electric energy display screen that electric energy detected information on the laboratory station, wherein: the voltage transformer and the current transformer are respectively connected with the input end of the special electric energy metering chip; the output end of the special electric energy metering chip is connected with the second controller; the second controller is connected with the electric energy display screen.

In a second aspect, the utility model provides a teaching laboratory, including a set of laboratory station, all be provided with on every laboratory station as above based on RFID's laboratory station power control system.

The beneficial effects of the utility model reside in that:

(1) the utility model discloses a radio frequency card and radio frequency card reader are laboratory station power transmission, and the radio frequency card uses with the cooperation of radio frequency card reader and need not mechanical contact and can work, and this has avoided the trouble that leads to because of mechanical wear to a certain extent.

(2) The utility model is provided with the timer, after the card swiping is successful, the first controller controls the timer to start timing, and when the timer times to reach the preset time length threshold, the laboratory station is automatically controlled to be powered off, manual power off is not needed, the labor intensity of a laboratory manager is reduced to a certain extent, and the work efficiency of the laboratory manager is improved; in addition, the station power failure of the automatic control laboratory can also avoid missing power failure, thereby being beneficial to realizing power saving to a certain extent and improving the power utilization safety.

(3) The utility model discloses avoided artifical push-and-pull electric brake to be laboratory power transmission and outage, helped improving to a certain extent for the security of laboratory power transmission and outage.

(4) The utility model discloses a radio frequency card and radio frequency card reader, card reader are used for reading a class of card, and the card reading to other kinds of cards can fail, and card reader all can not duplicate in addition to waterproof, antimagnetic, jam-proof, the student holds a card alright directly for laboratory station circular telegram, uses safe and reliable.

(5) The utility model discloses be equipped with special measurement chip of voltage transformer, current transformer, electric energy and electric energy display screen, can gather and show the electric energy information of laboratory station, help station user's power consumption safety to a certain extent, and then improve the power consumption security in laboratory.

Furthermore, the utility model relates to a principle is reliable, and simple structure has very extensive application prospect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural functional block diagram of a system according to an embodiment of the present invention.

Fig. 2 is a schematic circuit diagram of a first controller according to the present invention.

Fig. 3 is a schematic circuit diagram of the rf card reader according to the present invention.

Fig. 4-1 is a schematic circuit diagram of a relay driving circuit with a relay connected therein according to the present invention.

Fig. 4-2 is a schematic wiring diagram of the circuit shown in fig. 4-1 and the mains supply line.

Fig. 5 is a schematic circuit diagram of the display screen driving circuit of the present invention.

Fig. 6 is a schematic circuit diagram of the clock circuit according to the present invention.

Fig. 7 is a schematic circuit diagram of the memory module according to the present invention.

Fig. 8 is a schematic, structural and functional block diagram of a system according to another embodiment of the present invention.

Fig. 9 is a schematic circuit diagram of the RS232-USB interface converter according to the present invention.

Fig. 10 is a schematic block functional diagram of a system according to another embodiment of the present invention.

Fig. 11 is a schematic diagram of the circuit principle of the voltage transformer of the present invention.

Fig. 12 is a schematic diagram of the circuit principle of the current transformer of the present invention.

Fig. 13 is a schematic circuit diagram of the special electric energy metering chip of the present invention.

Fig. 14 is a schematic diagram of a circuit wiring principle of an interface between the special electric energy metering chip and the second controller according to the present invention.

Detailed Description

In order to make the technical solutions in the present invention better understood, 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, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

Example 1:

fig. 1 is an embodiment of the present invention for an RFID-based laboratory station power control system. The RFID-based laboratory station power control system in the embodiment is used for controlling the power of a single laboratory station in a teaching laboratory of colleges and universities.

Referring to fig. 1, the power control system for the laboratory work station based on the RFID comprises a control unit 100, a display screen 200, a relay 300 for controlling the on and off of a commercial power supply line 900 of the laboratory work station, a radio frequency card 400 for controlling the coil of the relay 300 to be electrified by swiping a card, a storage module 800, a key 600 for starting an RFID card reading mode, a radio frequency card reader 500 for being used with the radio frequency card 400, and a timer 700 for timing;

the control unit 100 comprises a first controller 101 and a relay driving circuit 103 for driving the relay 300; wherein:

the first controller 101 is respectively connected with the key 600, the timer 700, the storage module 800 and the radio frequency card reader 500;

the first controller 101 is connected with the display screen 200 through the display screen driving circuit 102;

the first controller 101 drives the relay 300 through the relay driving circuit 103, and the normally open contact 302 of the relay 300 is connected in series in the commercial power supply line 900.

The display screen 200, the keys 600 and the radio frequency card reader 500 are all arranged on the laboratory station, and the distance from the laboratory station to a user is relatively short, so that the convenience of student use is improved to a certain extent.

In this embodiment, the first controller 101 employs an STC15F2K-44 single chip microcomputer, and a schematic circuit diagram thereof is shown in fig. 2. The STC15F2K-44 singlechip is provided with an enhanced 8051 CPU, 1T, single clock/machine period, and an instruction code is completely compatible with the traditional 8051; the working voltage is STC15F2K6S2 series working voltage: 5.5V-4.2V (5V single chip microcomputer); the internal high-reliability reset is realized, 8-level selectable reset threshold voltage is realized, and an external reset circuit is avoided; the internal high-precision R/C clock drifts by +/-1 percent (40 ℃ to 85 ℃), the temperature drifts by 5 per thousand at normal temperature, and the internal clock can be selected from 5MHz to 35MHz (5.5296MHz/11.0592 MHz/; 22.1184MHz/33.1776 MHz); the working frequency range is 5 MHz-35 MHz; and (3) low power consumption design: low speed mode, idle mode, power down mode/shutdown mode; the resources that can wake up the power down mode/shutdown mode are: INT0/P3.2, INT1/P3.3(INT0/INT1 can be interrupted by rising edges and falling edges), INT2/P3.6, INT3/P3.7 and INT4/P3.0(INT2/INT3/INT4 can be interrupted by falling edges only); CCP0/CCP1/CCP 2; RxD/RxD 2; an internal low-power-consumption power-down awakening special timer; an internal low-power consumption special timer for waking up in a power-down mode is added, and the MCU can also be wakened up from the power-down mode/the shutdown mode.

Fig. 3 is a schematic circuit diagram of the rf card reader 500 according to the embodiment, in which a CLRC632 is used as a chip of the rf card reader 500. The CLRC632 chip is a high-integration radio frequency IC for 13.56MHz, the pins of the CLRC632 chip are compatible with MFRC500, MF RC530, MFRC531 and SL RC400, the CLRC chip can read and write Type A cards and Type B cards conforming to ISO14443 protocol, and electronic tags supporting SO15693 protocol. The CLRC632 chip provides 2 communication interfaces: the first is 8-bit parallel port, which can be directly connected with various 8-bit microprocessors; the second is SPI interface, and the system adopts the communication interface.

Fig. 4-1 is a schematic circuit diagram of the relay drive circuit 103 connected with the relay 300 in the present embodiment. Referring to fig. 4-1, the relay driving circuit 103 includes a third transistor Q3, a third resistor R3, an optocoupler U10, a fourth resistor R4, and a fourth diode D4, wherein:

a first end of the third resistor R3 is connected to a control signal input line 1031 for inputting a relay control signal;

a second end of the third resistor R3 is connected with the anode of the input end of the optical coupler U10;

the cathode of the input end of the optical coupler U10 is grounded;

an emitter E of the output end of the optical coupler U10 is connected with the base of a third triode Q3;

the collector of the output end of the optocoupler U10 is connected with the first end of the fourth resistor R4;

a second end of the fourth resistor R4, a cathode of the fourth diode D4, and a first end of a coil of the relay 300 are all connected to a VCC power supply;

the anode of the fourth diode D4 and the second end of the coil of the relay 300 are both connected to the collector of the third transistor Q3;

the emitter of the third transistor Q3 is grounded.

The circuit shown in fig. 4-1 is used to control the energizing and de-energizing of the utility power supply lines 900 of a laboratory workstation. Referring to fig. 4-1, the normally open contact 302 is connected in series to the mains power supply line 900 through a connection terminal J9. The use of the connection terminal J9 increases the convenience of circuit connection. Wherein, in fig. 4-1, reference numeral 301 is a normally closed contact of the relay 300, and the connection terminal J9 has a 1 connection terminal, a 2 connection terminal and a 3 connection terminal, wherein: the 1 wiring terminal is connected with the normally closed contact 301, the 2 wiring terminal is connected with the common end of the relay 300, and the 3 wiring terminal is connected with the normally open contact 302. In addition, the 2 terminal and the 3 terminal are connected in series in the utility power supply line 900, specifically, the 2 terminal and the 3 terminal are connected in series in the live line L of the utility power supply line 900 in this embodiment, as shown in fig. 4-2.

In this embodiment, the display panel 200 is an LCD12864 LCD panel, and the display panel driving circuit 102 is an LCD12864 LCD panel driving circuit, and the schematic diagram of the circuit is shown in fig. 5. Referring to fig. 5, the LCD12864 LCD panel driving circuit adopts 74HC595, where 74HC595 is an 8-bit shift buffer with serial input and parallel output: the parallel output is a tri-state output. On the rising edge of SCK, serial data is input into an internal 8-bit shift buffer by SDL and output by Q7'; the parallel output is to store the data in the 8-bit shift register into the 8-bit parallel output register at the rising edge of LCK. When the control signal of the serial data input end OE is enabled in a low mode, the output value of the parallel output end is equal to the value stored in the parallel output register.

Optionally, the control unit 100 in this embodiment further includes a clock circuit, and the clock circuit is connected to the first controller 101. The circuit schematic of the clock circuit is shown in fig. 6. Referring to fig. 6, the clock circuit is a high-performance, low-power consumption, real-time RAM clock circuit introduced by DALLAS, usa, which can time the year, month, day, week, hour, minute, and second, has leap year compensation function, adopts a three-wire interface to perform synchronous communication with a processor, and can transmit a plurality of bytes of clock signals or RAM data at a time in a burst manner. Inside the DS1302 is a 31 × 8 RAM register for temporarily storing data. DS1302 is an upgrade product of DS1202 and is compatible with DS1202, DS1302 has 12 registers, 7 of them are related to calendar and clock, and the stored data bit is in BCD code form. The clock circuit is connected with pins P2.6, P2.7 and P4.5 of the first controller 101, and displays real-time on the display screen 200 under the control of the first controller 101, so that a user can conveniently know the service time of a station.

The pin arrangement of DS1302, with VCC2 being the primary power supply and VCC1 being the backup power supply. The continuous operation of the clock can be maintained even when the main power supply is turned off. DS1302 is powered by the larger of VCC1 or VCC 2. VCC2 provides power to DS1302 when VCC2 is greater than VCC1+ 0.2V. DS1302 is powered by VCC1 when VCC2 is less than VCC 1. X1 and X2 are oscillation sources and externally connect with a 32.768kHz crystal oscillator. RST is the reset/chip select line and all data transfers are initiated by driving RST input high. The RST input has two functions: firstly, RST switches on a control logic to allow an address/command sequence to be sent into a shift register; second, the RST provides a method of terminating single or multi-byte data transfers. When RST is high, all data transfers are initialized, allowing operation of the DS 1302. If RST is set to low level during the transmission process, the data transmission is terminated, and the I/O pin is changed to high impedance state. In power-on operation, when VCC is greater than 2.0V, RST keeps low level. When SCLK is low, RST is set to high. I/O is serial data input/output (bidirectional) and SCLK is clock input.

The memory module 800 described in this embodiment adopts a serial Flash memory, and a schematic circuit diagram thereof is shown in fig. 7. The circuit shown in fig. 7 can process data such as information of the radio frequency card 400, and store the information in the serial Flash memory. Referring to fig. 7, in the design of the memory module 800, the W25Q26 is selected as the serial Flash memory. The connection and wiring mode of the W25Q26 and the singlechip is as follows:

(1) the/CS is connected with a P4.4 port of the single chip;

(2) the DO port is connected with a P4.3 port of the single chip machine;

(3) the P3.7 is connected with a P3.7 port of the singlechip;

(4) the P4.2 is connected with the P4.2 port of the singlechip.

W25Q16de is an 8-pin package, the meaning of the pins is as follows:

(1) when the/CS is high level, the serial data output (D0, IO0, IO2 and IO3) pins are in high impedance state. when/CS is low level, the chip power consumption is increased to normal operation, and data is read from the chip.

(2) The standard SPI reads data or state from the chip with a unidirectional D0 (output) on the falling edge of CLK when pin sequential write commands are input.

(3) Write protect/WP is used to protect the status register. the/WP pin is active low. When the QE bit of the status register 2 is set, the function of the/WP pin is disabled.

(4) HOLD segment/HOLD, when HOLD pin is active, allows the chip to temporarily stop working. when/CS goes low, when/HOLD goes low, pin D0 will go high, and the signals on the DI and CLOK pins are inactive. when/HOLD goes high, the chip resumes operation.

(5) The serial clock CLK is input to the pin to provide timing for serial input and output operations.

In this embodiment, the rf card 400 is a Mifare card, and the core of the Mifare ics50 microchip from Philips.

Main indexes of the Mifare card are as follows:

(1) EEPROM with capacity of 8K bit;

(2) dividing the data into 16 sectors, wherein each sector is 4 blocks, each block is 16 bytes, and the block is taken as an access unit;

(3) each sector has an independent set of passwords and access control;

(4) each card has a unique serial number which is 32 bits;

(5) the system is provided with an anti-collision mechanism and supports multi-card operation;

(6) the device is free of power supply, is provided with an antenna, and is internally provided with an encryption control logic and a communication logic circuit;

(7) the data retention period is 10 years, 10 thousands of times can be rewritten, and unlimited times can be read;

(8) the working frequency is as follows: 13.56 MHZ;

(9) communication rate: 106 KBPS;

(10) reading and writing distance: within 10mm (relevant to the reader/writer).

Communication between the Mifare card and the radio frequency card reader 500:

(1) resetting and answering: the communication protocol and the communication baud rate of the Mifare card are predefined, when a card enters the operating range of the reader-writer, the reader-writer communicates with the Mifare card by a specific protocol, so as to determine whether the card is an MI radio frequency card, namely, the card type of the card is verified.

(2) An anti-collision mechanism: when a plurality of cards enter the operation range of the reader-writer, the anti-collision mechanism selects one card from the operation range, if the card is not selected, the anti-collision mechanism is in an idle mode to wait for next card selection, and the process returns the serial number of the selected card).

(3) Selecting a card: the serial number of the selected card is selected and at the same time the capacity code of the card is returned.

(4) Three mutual confirmations: after the card to be processed is selected, the reader-writer determines the sector number to be accessed, performs password verification on the sector password, and can perform communication through an encryption stream after three times of mutual authentication. (another sector password check must be made when another sector is selected.)

The working mode of the system using the Mifare card is as follows: the STC15F2K controls the CRLC632 to drive the antenna to perform read/write operations on the Mifare card, and when the card swiping is successful, the serial number of the Mifare card is stored in the storage module 800 (at this time, the STC15F2K also outputs a relay control signal (high level) through a p2.5 channel to drive the relay 300 and control the timer 700 to start timing). The system is powered by a 5V power supply.

It should be noted that, the first controller 101 determines whether the card reading of the radio frequency card 400 is successful, and the adopted specific determination method does not belong to the protection scope of the present invention, and those skilled in the art can implement the determination according to the prior art and the related text of this specification.

In this embodiment, the power control system for the laboratory workstation based on the RFID further includes a buzzer 1000 and an LED indicator 1100 for prompting the success and failure of card swiping of the radio frequency card 400, and the buzzer 1000 and the LED indicator 1100 are both connected to the first controller 101. When the radio frequency card 400 is used successfully, the first controller 101 controls the buzzer 1000 to sound and controls the LED indicator lamp 1100 to be turned off; when the radio frequency card 400 fails to swipe the card, the first controller 101 controls the buzzer 1000 not to sound and controls the LED indicator 1100 to light.

When a card is needed to be swiped to supply power to a station, firstly, a key 600 is pressed to enter a card reading state, and then, the radio frequency card 400 is placed in a card reading area of the radio frequency card reader 500 to read the card; the first controller 101 checks the information of the radio frequency card read by the radio frequency card reader 500, and after the check is passed (at this time, the card swiping is successful), a high-level control signal is sent to the control signal input line 1031 of the relay drive circuit 103 through the P2.5 channel (that is, the control signal introduced into the control signal input line 1031 is high level), at this time, the photodiode of the optical coupler U10 is conducted, so that the third triode Q3 is conducted, the Q3 is conducted, so that the peripheral circuit is conducted, at this time, the coil of the relay 300 is powered on, the commercial power supply line 900 of the laboratory station is connected, at this time, the laboratory station is powered on, and the laboratory station electric equipment on the current powered station can be used for learning; after the card swiping is successful, the first controller 101 controls the timer 700 to start timing. When the timer 700 counts time and reaches a preset time length threshold (for example, 1 hour), the first controller 101 automatically clears the content stored in the storage module 800, and sends a low-level control signal to the control signal input line 1031 of the relay drive circuit 103 through the P2.5 channel thereof, at this time, the photodiode of the optocoupler U10 stops conducting, so that the third triode Q3 stops conducting, the Q3 peripheral circuit stops conducting, at this time, no current passes through the coil of the relay 300, the utility power supply line 900 of the laboratory workstation is disconnected, at this time, the laboratory workstation is automatically powered off, that is, the electric equipment of the laboratory workstation on the corresponding laboratory workstation is automatically powered off.

It should be noted that, in the specific implementation of the present invention, when the key 600 is pressed for the first time to make the system enter the card reading state, the display screen 200 prompts that the card reading state is entered; after the card is successfully swiped, the key 600 is pressed again to clear the relevant prompt information of the state of entering the card reading on the display screen 200.

It should be noted that, in this embodiment, after the timer 700 starts to time, the timing information of the timer 700 is displayed in real time through the display screen 200, so that the user at the workstation can know the remaining power-on duration of the workstation conveniently.

Example 2:

compared with embodiment 1, the difference between this embodiment and embodiment 1 is that the control unit 100 of the RFID-based laboratory workstation power supply control system in this embodiment further includes an RS232-USB interface converter for accessing an external computer, where the external computer is connected to the first controller 101 through the RS232-USB interface converter, as shown in fig. 8.

The circuit schematic diagram of the RS232-USB interface converter is shown in fig. 9. Referring to fig. 9, the RS232-USB interface converter is composed of a chip PL2303HX and its peripheral circuits. PL2303 is a highly integrated RS232-USB interface converter manufactured by Prolific corporation, and provides a solution for facilitating connection of RS232 full duplex asynchronous serial communication device with USB function interface. The circuit shown in fig. 9 is a downloader circuit of the first controller 101, wherein the USB bb shown in the figure is used for accessing an external computer, and the USB TXD and USB RXD shown in the figure are accessed to the first controller 101, and are used for implementing burning or downloading (downloading from the external computer) of the relevant program in the first controller 101.

Example 3:

compared with the embodiment 2, the difference between this embodiment and the embodiment 2 is that the laboratory workstation power control system based on RFID described in this embodiment further includes a dedicated electric energy metering chip 1500, a second controller 1600, a voltage transformer 1300 for installing on the utility power supply line 900 to detect the supply voltage, a current transformer 1400 for installing on the utility power supply line 900 to detect the supply current, and an electric energy display screen 1700 arranged on a laboratory workstation to display the electric energy detection information in real time, wherein: the voltage transformer 1300 and the current transformer 1400 are respectively connected with the input end of the electric energy special metering chip 1500; the output end of the special electric energy metering chip 1500 is connected with the second controller 1600; the second controller 1600 is connected to a power display screen 1700, as shown in fig. 10. When the intelligent power supply device is used, the voltage transformer 1300 detects the voltage in the commercial power supply line 900 in real time, the current transformer 1400 detects the current in the commercial power supply line 900 in real time, the detection values of the voltage transformer 1300 and the current transformer 1400 are transmitted to the special electric energy metering chip 1500 in real time for processing, the voltage, the current and the power of the power supply line 900 are obtained after processing, and the voltage, the current and the power are displayed through the electric energy display screen 1700 under the control action of the second controller 1600.

Fig. 11 shows a schematic circuit diagram of the voltage transformer 1300, and fig. 12 shows a schematic circuit diagram of the current transformer 1400. A schematic circuit diagram of the electric energy dedicated metering chip 1500 is shown in fig. 13. Among them, the REFO port in fig. 11 is connected to the P11 port of the power dedicated metering chip 1500; the REFO port in fig. 12 is connected to the P11 port of the power-dedicated metering chip 1500.

In this embodiment, the dedicated electric energy metering chip 1500 adopts an ATT7022 metering chip, and the second controller 1600 adopts an STM32F103RB chip. The schematic circuit wiring principle of the interface between the electric energy dedicated metering chip 1500 and the second controller 1600 is shown in fig. 14.

Example 4:

this example provides a teaching laboratory that includes a set of laboratory stations, each equipped with the RFID-based laboratory station power control system described in example 1.

In view of the fact that each laboratory station of the teaching laboratory in this embodiment is provided with the RFID-based laboratory station power control system described in embodiment 1, all advantages of the RFID-based laboratory station power control system described in embodiment 1 are provided, and details are not repeated herein.

Example 5:

this example provides a teaching laboratory that includes a set of laboratory stations, each equipped with the RFID-based laboratory station power control system described in example 2.

The technical effects achieved by the present embodiment can be referred to the above description, and are not described herein again.

Example 6:

this example provides a teaching laboratory that includes a set of laboratory stations each equipped with the RFID-based laboratory station power control system described in example 3.

The technical effects achieved by the present embodiment can be referred to the above description, and are not described herein again.

The same and similar parts in the various embodiments in this specification may be referred to each other.

Although the present invention has been described in detail by referring to the drawings in conjunction with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and substance of the present invention, and these modifications or substitutions are intended to be within the scope of the present invention/any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. The laboratory station power supply control system based on the RFID is characterized by comprising a control unit (100), a relay (300) for controlling the on and off of a mains supply power supply line (900) of a laboratory station, a radio frequency card (400) for controlling the coil of the relay (300) to be electrified by swiping a card, a storage module (800), a key (600) for starting an RFID card reading mode, a radio frequency card reader (500) for being matched with the radio frequency card (400) to use, and a timer (700) for timing;

the control unit (100) comprises a first controller (101) and a relay driving circuit (103) for driving the relay (300); wherein:

the first controller (101) is respectively connected with the key (600), the timer (700), the storage module (800) and the radio frequency card reader (500);

the first controller (101) drives the relay (300) through the relay driving circuit (103), and a normally open contact (302) of the relay (300) is connected in series in the commercial power supply line (900).

2. The RFID-based laboratory workstation power control system of claim 1, wherein said relay driver circuit (103) comprises a third transistor Q3, a third resistor R3, an optocoupler U10, a fourth resistor R4, and a fourth diode D4, wherein:

a first end of the third resistor R3 is connected with a control signal input line (1031) for inputting a relay control signal;

a second end of the third resistor R3 is connected with the anode of the input end of the optical coupler U10;

the cathode of the input end of the optical coupler U10 is grounded;

an emitter E of the output end of the optical coupler U10 is connected with the base of a third triode Q3;

the collector of the output end of the optocoupler U10 is connected with the first end of the fourth resistor R4;

a second end of the fourth resistor R4, a cathode of the fourth diode D4, and a first end of a coil of the relay (300) are all connected with a VCC power supply;

the anode of the fourth diode D4 and the second end of the coil of the relay (300) are connected with the collector of the third triode Q3;

the emitter of the third transistor Q3 is grounded.

3. The RFID-based laboratory workstation power control system according to claim 1 or 2, wherein said RFID-based laboratory workstation power control system further comprises a display screen (200), said control unit (100) further comprises a display screen driving circuit (102) for driving said display screen (200), wherein: the first controller (101) is connected with the display screen (200) through a display screen driving circuit (102).

4. The RFID-based laboratory workstation power control system according to claim 1 or 2, wherein said control unit (100) further comprises an RS232-USB interface converter for accessing an external computer, wherein:

the external computer is connected with the first controller (101) through the RS232-USB interface converter.

5. The RFID-based laboratory workstation power control system according to claim 1 or 2, characterized in that the laboratory workstation power control system comprises a buzzer (1000) and an LED indicator light (1100) for prompting the success and failure of card swiping of the radio frequency card (400), and the buzzer (1000) and the LED indicator light (1100) are both connected to the first controller (101).

6. The RFID-based laboratory workstation power control system according to claim 1 or 2, characterized in that said control unit (100) further comprises a clock circuit connected to said first controller (101).

7. The RFID-based laboratory workstation power control system according to claim 3, wherein the display screen (200), the keys (600) and the radio frequency card reader (500) are all arranged on the laboratory workstation.

8. The RFID-based laboratory workstation power control system according to claim 1 or 2, further comprising a dedicated power metering chip (1500), a second controller (1600), a voltage transformer (1300) installed on the power supply line (900) for detecting a power supply voltage, a current transformer (1400) installed on the power supply line (900) for detecting a power supply current, and a power display screen (1700) disposed on a laboratory workstation for displaying power detection information, wherein:

the voltage transformer (1300) and the current transformer (1400) are respectively connected with the input end of the special electric energy metering chip (1500);

the output end of the special electric energy metering chip (1500) is connected with the second controller (1600);

the second controller (1600) is connected with the power display screen (1700).

9. A teaching laboratory, includes a set of laboratory stations, its characterized in that: each laboratory station is provided with an RFID-based laboratory station power control system according to any one of claims 1 to 8.

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