RFID safety switch and control circuit thereof

Abstract

The utility model discloses an RFID safety switch and a control circuit thereof, which are used for driving on / off of the switch, the RFID safety switch comprises a control module, a reader and an electronic tag, the control module is electrically connected to the switch, the control module is also electrically connected with the reader, and the reader is electrically connected with the electronic tag; the control module comprises a single-chip microcomputer U3, the single-chip microcomputer U3 can control a switch, the control module further comprises a first interface J3 and a second interface J4, the first interface J3 is connected with a pin 9 of the single-chip microcomputer U3, and the second interface J4 is connected with a pin 15 of the single-chip microcomputer U3. The circuit is simple in structure and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of switch electronics, in particular to an RFID safety switch and a control circuit thereof. Background Art

[0002] With the development of technology, more and more RFID safety switches are used in the fields of smart door locks and industrial machine safety switches. RFID is an easy-to-control, simple and practical application technology that is particularly suitable for automatic control. The unique advantages of RFID are unmatched by other identification technologies. There are mainly the following aspects: convenient and fast reading, data reading does not require a light source, and can even be done through the outer packaging; the effective identification distance is larger, and when using active tags with built-in batteries, the effective identification distance can reach more than 30 meters; the identification speed is fast, and the reader can read the information in it immediately as soon as the tag enters the magnetic field. The reader sends a radio frequency signal of a specific frequency through the transmitting antenna. When the electronic tag enters the working area where the radio frequency signal is located, an induced current is generated, thereby obtaining energy and the electronic tag is activated, which causes the electronic tag to feedback its own number information through the built-in radio frequency antenna, thereby controlling the safe opening / closing. At present, the circuit structure of the safety switch on the market to solve the above problems is complex and the cost is high. Utility Model Content

[0003] The utility model aims to provide an RFID safety switch and a control circuit thereof with simple circuit structure and low cost.

[0004] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide an RFID safety switch control circuit for driving the switch to be opened / closed, comprising a control module, a reader, and an electronic tag, wherein the control module is electrically connected to the switch, and the control module is also electrically connected to the reader, and the reader and the electronic tag are electrically connected.

[0005] The control module includes a single-chip microcomputer U3, and the single-chip microcomputer U3 can control the switch. The control module also includes a first interface J3 and a second interface J4. The first interface J3 is connected to the pin 9 of the single-chip microcomputer U3, and the second interface J4 is connected to the pin 15 of the single-chip microcomputer U3.

[0006] As a preferred solution, the reader includes a chip U2 and a first antenna module, the chip U2 is electrically connected to the single-chip computer U3, the first antenna module includes an antenna L3, an inductor L1, an inductor L2, a capacitor C23A, a capacitor C23, a capacitor C22, a capacitor C26, a resistor R9, a capacitor C24, a capacitor C24A, a capacitor C25, a capacitor C27 and a resistor R10, one end of the inductor L1 is connected to the pin 11 of the chip U2, the other end of the inductor L1 is connected to the capacitor C23A, the capacitor C23 and the capacitor C22, and the other ends of the capacitor C23A and the capacitor C23 are connected. The other end of the capacitor C22 is connected to the capacitor C26 and the resistor R9, the other end of the capacitor C26 is grounded, the other end of the resistor R9 is connected to the antenna L3, one end of the inductor L2 is connected to the pin 13 of the chip U2, the other end of the inductor L2 is connected to the capacitor C24, the capacitor C24A and the capacitor C25, the other ends of the capacitor C24 and the capacitor C24A are connected to the ground in parallel, the other end of the capacitor C25 is connected to the capacitor C27 and the resistor R10, the other end of the capacitor C27 is grounded, and the other end of the resistor R10 is connected to the other end of the antenna L3.

[0007] As a preferred solution, the electronic tag includes a chip U1 and a second antenna module, the second antenna module includes an antenna L4, a capacitor C1 and a capacitor C2, the capacitor C1 is connected in parallel between pin 3 and pin 4 of the chip U1, the capacitor C2 is connected in parallel at both ends of the capacitor C1, the antenna L4 is connected in parallel at both ends of the capacitor C2, and the chip U1 and the chip U2 are wirelessly connected through the antenna L4 and the antenna L3.

[0008] As a preferred solution, a first driving switch module is connected between the first interface J3 and the pin 9 of the single-chip computer U3, and the first driving switch module includes a transistor Q1, a transistor Q3, a resistor R13, a resistor R16, a resistor R21, and a resistor R38. The base of the transistor Q1 is connected to the pin 9 of the single-chip computer U3, and the resistor R13 is connected between the base of the transistor Q1 and the pin 9 of the single-chip computer U3. The emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the resistor R16 and the resistor R21. The other end of the resistor R16 is connected to the base of the transistor Q3 and the resistor R38. The other end of the resistor R38 is connected between the power supply end and the emitter of the transistor Q3, and the other end of the resistor R21 is connected between the first interface J3 and the collector of the transistor Q3.

[0009] As a preferred solution, a second driving switch module is connected between the second interface J4 and the pin 15 of the single-chip computer U3, and the second driving switch module includes a transistor Q2, a transistor Q4, a resistor R14, a resistor R18, a resistor R25, and a resistor R39. The base of the transistor Q2 is connected to the pin 15 of the single-chip computer U3, and the resistor R14 is connected between the base of the transistor Q2 and the pin 15 of the single-chip computer U3. The emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is connected to the resistor R18 and the resistor R25. The other end of the resistor R18 is connected to the base of the transistor Q4 and the resistor R39. The other end of the resistor R39 is connected between the power supply end and the emitter of the transistor Q4, and the other end of the resistor R25 is connected between the second interface J4 and the collector of the transistor Q4.

[0010] As a preferred embodiment, the control module also includes an indicator light module, which includes a light-emitting diode LED1 and a light-emitting diode LED2, the positive pole of the light-emitting diode LED1 is connected to the power supply end, the negative pole of the light-emitting diode LED1 is connected to the pin 12 of the single-chip computer U3, a resistor R3 is also connected between the negative pole of the light-emitting diode LED1 and the pin 12 of the single-chip computer U3, the negative pole of the light-emitting diode LED2 is connected to the power supply end, the positive pole of the light-emitting diode LED2 is connected to the pin 11 of the single-chip computer U3, and a resistor R2 is also connected between the positive pole of the light-emitting diode LED2 and the pin 11 of the single-chip computer U3.

[0011] As a preferred solution, the reader further includes an RC oscillator X1, and the RC oscillator X1 is connected to the chip U2.

[0012] As a preferred solution, the RFID safety switch control circuit also includes a power supply module, which includes a chip U4, a third interface J1 and a fourth interface J2, the third interface J1 and the fourth interface J2 are connected to the chip U4, the third interface J1 is connected to the power supply end, and the fourth interface J2 is connected to the power supply end, and the power supply module also includes a resistor R19, a capacitor C16, a capacitor C14, a resistor R5, a resistor R11, a diode D1, a diode D2, a voltage regulator diode Z1, a resistor R17, a resistor R15, a capacitor C13, an inductor L4, a resistor R12, a resistor R6, and a capacitor C15.

[0013] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide an RFID safety switch, and to control the switch by using the RFID safety switch control circuit as described above.

[0014] The utility model provides an RFID safety switch control circuit, which adopts a single chip microcomputer U3, electrically connects a reader and an electronic tag to perform identification communication, cooperates with a first interface J3 and a second interface J4 to output a control signal to control the switch, has a simple circuit structure, and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the utility model will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The present invention is a schematic diagram of the circuit principle of a control module, a reader and a power supply module of an RFID safety switch control circuit in one embodiment of the present invention.

[0017] Figure 2 The utility model is a schematic diagram of the circuit principle of an electronic tag of an RFID safety switch control circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Similar component numbers in the drawings represent similar components. Obviously, the embodiments to be described below are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0019] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0020] It should also be understood that the terms used in this utility model embodiment specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model embodiments. As used in the utility model embodiment specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0021] Please refer to Figure 1 , Figure 2The utility model provides an RFID safety switch control circuit for driving the switch to be turned on / off, comprising a control module, a reader, and an electronic tag. The control module is electrically connected to the switch, and the control module is also electrically connected to the reader. The reader and the electronic tag are electrically connected.

[0022] The control module includes a single-chip microcomputer U3, and the single-chip microcomputer U3 can control the switch. The control module also includes a first interface J3 and a second interface J4. The first interface J3 is connected to the pin 9 of the single-chip microcomputer U3, and the second interface J4 is connected to the pin 15 of the single-chip microcomputer U3.

[0023] Specifically, the model of the single chip microcomputer U3 is HC32L130, and its matching peripheral circuit structure is simple, which saves costs and improves detection sensitivity.

[0024] The utility model provides an RFID safety switch control circuit, which adopts a single chip microcomputer U3, electrically connects a reader and an electronic tag to perform identification communication, cooperates with a first interface J3 and a second interface J4 to output a control signal to control the switch, has a simple circuit structure, and saves costs.

[0025] Further, the reader includes a chip U2 and a first antenna module, the chip U2 is electrically connected to the single-chip computer U3, the first antenna module includes an antenna L3, an inductor L1, an inductor L2, a capacitor C23A, a capacitor C23, a capacitor C22, a capacitor C26, a resistor R9, a capacitor C24, a capacitor C24A, a capacitor C25, a capacitor C27 and a resistor R10, one end of the inductor L1 is connected to the pin 11 of the chip U2, the other end of the inductor L1 is connected to the capacitor C23A, the capacitor C23 and the capacitor C22, and the other ends of the capacitor C23A and the capacitor C23 are connected in parallel The other end of the capacitor C22 is connected to the capacitor C26 and the resistor R9, the other end of the capacitor C26 is grounded, the other end of the resistor R9 is connected to the antenna L3, one end of the inductor L2 is connected to the pin 13 of the chip U2, the other end of the inductor L2 is connected to the capacitor C24, the capacitor C24A and the capacitor C25, the other ends of the capacitors C24 and C24A are connected to the ground in parallel, the other end of the capacitor C25 is connected to the capacitor C27 and the resistor R10, the other end of the capacitor C27 is grounded, and the other end of the resistor R10 is connected to the other end of the antenna L3. Specifically, the model used by the chip U2 is FM17622.

[0026] Furthermore, the electronic tag includes a chip U1 and a second antenna module, the second antenna module includes an antenna L4, a capacitor C1 and a capacitor C2, the capacitor C1 is connected in parallel between pins 3 and 4 of the chip U1, the capacitor C2 is connected in parallel at both ends of the capacitor C1, the antenna L4 is connected in parallel at both ends of the capacitor C2, and the chip U1 is wirelessly connected to the chip U2 via the antenna L4 and the antenna L3. Specifically, the model used by the chip U1 is FM11NT082C.

[0027] Further, a first driving switch module is connected between the first interface J3 and the pin 9 of the single-chip computer U3, and the first driving switch module includes a transistor Q1, a transistor Q3, a resistor R13, a resistor R16, a resistor R21, and a resistor R38. The base of the transistor Q1 is connected to the pin 9 of the single-chip computer U3, and the resistor R13 is connected between the base of the transistor Q1 and the pin 9 of the single-chip computer U3. The emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the resistor R16 and the resistor R21. The other end of the resistor R16 is connected to the base of the transistor Q3 and the resistor R38. The other end of the resistor R38 is connected between the power supply end and the emitter of the transistor Q3, and the other end of the resistor R21 is connected between the first interface J3 and the collector of the transistor Q3. It can be understood that the transistor Q1 is an NPN transistor, and the transistor Q3 is a PNP transistor, and two-stage drive is adopted, which is safe and stable.

[0028] Further, a second driving switch module is connected between the second interface J4 and the pin 15 of the single-chip computer U3, and the second driving switch module includes a transistor Q2, a transistor Q4, a resistor R14, a resistor R18, a resistor R25, and a resistor R39. The base of the transistor Q2 is connected to the pin 15 of the single-chip computer U3, and the resistor R14 is connected between the base of the transistor Q2 and the pin 15 of the single-chip computer U3. The emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is connected to the resistor R18 and the resistor R25. The other end of the resistor R18 is connected to the base of the transistor Q4 and the resistor R39. The other end of the resistor R39 is connected between the power supply end and the emitter of the transistor Q4, and the other end of the resistor R25 is connected between the second interface J4 and the collector of the transistor Q4. It can be understood that the transistor Q2 is an NPN transistor, and the transistor Q4 is a PNP transistor, which adopts a two-stage drive, which is safe and stable.

[0029] Furthermore, the control module also includes an indicator light module, which includes a light emitting diode LED1 and a light emitting diode LED2, wherein the positive pole of the light emitting diode LED1 is connected to the power supply end, the negative pole of the light emitting diode LED1 is connected to the pin 12 of the single-chip computer U3, and a resistor R3 is also connected between the negative pole of the light emitting diode LED1 and the pin 12 of the single-chip computer U3, the negative pole of the light emitting diode LED2 is connected to the power supply end, the positive pole of the light emitting diode LED2 is connected to the pin 11 of the single-chip computer U3, and a resistor R2 is also connected between the positive pole of the light emitting diode LED2 and the pin 11 of the single-chip computer U3. Understandably, the light emitting diode LED1 can emit green light, and the light emitting diode LED2 can emit red light, and the single-chip computer U3 controls the two light emitting diodes to emit different lights to display different states, so that it is convenient to identify what state the switch is currently in.

[0030] Furthermore, the reader further comprises an RC oscillator X1, and the RC oscillator X1 is connected to the chip U2. The RC oscillator X1 can realize low power consumption automatic adjustment.

[0031] Furthermore, the RFID safety switch control circuit also includes a power module, which includes a chip U4, a third interface J1 and a fourth interface J2, wherein the third interface J1 and the fourth interface J2 are connected to the chip U4, the third interface J1 is connected to the power supply end, and the fourth interface J2 is connected to the power supply end, and the power module also includes a resistor R19, a capacitor C16, a capacitor C14, a resistor R5, a resistor R11, a diode D1, a diode D2, a voltage regulator diode Z1, a resistor R17, a resistor R15, a capacitor C13, an inductor L4, a resistor R12, a resistor R6, and a capacitor C15. Specifically, the model used by the chip U4 is AP8852A, and the chip U4 is a DC-DC power supply voltage regulator chip that can provide a stable and efficient power supply.

[0032] It should be noted that the single-chip microcomputer U3 controls the contactless data communication between the chip U2 and the chip U1. The single-chip microcomputer U3 can identify the communication between the chip U2 and the chip U1 according to the logical operation, make corresponding processing and control for different settings, and finally send out the command signal to control the reader to complete the corresponding read and write operations; and control the back-end related circuits, such as controlling the opening / closing of several switches. The chip U2 sends a radio frequency signal of a specific frequency through the antenna L3. When the electronic tag enters the working area where the radio frequency signal is located, the antenna L4 of the electronic tag will generate an induced current, thereby obtaining energy and feeding it back to the chip U1, so that the electronic tag is activated, which makes the chip U1 of the electronic tag send its own number information through the built-in radio frequency antenna L4. The chip U2 receives the modulated signal sent from the electronic tag through the antenna L3, and transmits it to the chip U2 for signal processing module through the antenna adjuster. The effective information after demodulation and decoding is sent to the background host system for related processing. The built-in EEPROM of the electronic tag stores its own number information.

[0033] The utility model also provides an RFID safety switch, which uses the RFID safety switch control circuit as described above to control the switch.

[0034] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.

[0041] The above is a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An RFID safety switch control circuit, used to drive the switch on / off, characterized in that: It includes a control module, a reader, and an electronic tag, wherein the control module is electrically connected to a switch, the control module is also electrically connected to the reader, and the reader is electrically connected to the electronic tag; The control module includes a single-chip microcomputer U3, and the single-chip microcomputer U3 can control the switch. The control module also includes a first interface J3 and a second interface J4. The first interface J3 is connected to the pin 9 of the single-chip microcomputer U3, and the second interface J4 is connected to the pin 15 of the single-chip microcomputer U3.

2. The RFID safety switch control circuit according to claim 1, characterized in that: The reader includes a chip U2 and a first antenna module. The chip U2 is electrically connected to the single-chip computer U3. The first antenna module includes an antenna L3, an inductor L1, an inductor L2, a capacitor C23A, a capacitor C23, a capacitor C22, a capacitor C26, a resistor R9, a capacitor C24, a capacitor C24A, a capacitor C25, a capacitor C27 and a resistor R10. One end of the inductor L1 is connected to a pin 11 of the chip U2, and the other end of the inductor L1 is connected to the capacitor C23A, the capacitor C23 and the capacitor C22. The other ends of the capacitor C23A and the capacitor C23 are connected to the ground in parallel. The other end of the capacitor C22 is connected to the capacitor C26 and the resistor R9, the other end of the capacitor C26 is grounded, the other end of the resistor R9 is connected to the antenna L3, one end of the inductor L2 is connected to the pin 13 of the chip U2, the other end of the inductor L2 is connected to the capacitor C24, the capacitor C24A and the capacitor C25, the other ends of the capacitor C24 and the capacitor C24A are connected to the ground in parallel, the other end of the capacitor C25 is connected to the capacitor C27 and the resistor R10, the other end of the capacitor C27 is grounded, and the other end of the resistor R10 is connected to the other end of the antenna L3.

3. The RFID safety switch control circuit according to claim 2, characterized in that: The electronic tag includes a chip U1 and a second antenna module, the second antenna module includes an antenna L4, a capacitor C1 and a capacitor C2, the capacitor C1 is connected in parallel between pins 3 and 4 of the chip U1, the capacitor C2 is connected in parallel at both ends of the capacitor C1, the antenna L4 is connected in parallel at both ends of the capacitor C2, and the chip U1 is wirelessly connected to the chip U2 through the antenna L4 and the antenna L3.

4. The RFID safety switch control circuit according to claim 3, characterized in that: A first driving switch module is connected between the first interface J3 and the pin 9 of the single-chip computer U3. The first driving switch module includes a transistor Q1, a transistor Q3, a resistor R13, a resistor R16, a resistor R21, and a resistor R38. The base of the transistor Q1 is connected to the pin 9 of the single-chip computer U3, the resistor R13 is connected between the base of the transistor Q1 and the pin 9 of the single-chip computer U3, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to the resistor R16 and the resistor R21, the other end of the resistor R16 is connected to the base of the transistor Q3 and the resistor R38, the other end of the resistor R38 is connected between the power supply end and the emitter of the transistor Q3, and the other end of the resistor R21 is connected between the first interface J3 and the collector of the transistor Q3.

5. The RFID safety switch control circuit according to claim 4, characterized in that: A second driving switch module is connected between the second interface J4 and the pin 15 of the single-chip computer U3, and the second driving switch module includes a transistor Q2, a transistor Q4, a resistor R14, a resistor R18, a resistor R25, and a resistor R39. The base of the transistor Q2 is connected to the pin 15 of the single-chip computer U3, and the resistor R14 is connected between the base of the transistor Q2 and the pin 15 of the single-chip computer U3. The emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is connected to the resistor R18 and the resistor R25. The other end of the resistor R18 is connected to the base of the transistor Q4 and the resistor R39. The other end of the resistor R39 is connected between the power supply end and the emitter of the transistor Q4, and the other end of the resistor R25 is connected between the second interface J4 and the collector of the transistor Q4.

6. The RFID safety switch control circuit according to claim 5, characterized in that: The control module also includes an indicator light module, which includes a light emitting diode LED1 and a light emitting diode LED2. The positive pole of the light emitting diode LED1 is connected to the power supply end, the negative pole of the light emitting diode LED1 is connected to the pin 12 of the single-chip computer U3, and a resistor R3 is also connected between the negative pole of the light emitting diode LED1 and the pin 12 of the single-chip computer U3. The negative pole of the light emitting diode LED2 is connected to the power supply end, the positive pole of the light emitting diode LED2 is connected to the pin 11 of the single-chip computer U3, and a resistor R2 is also connected between the positive pole of the light emitting diode LED2 and the pin 11 of the single-chip computer U3.

7. The RFID safety switch control circuit according to claim 6, characterized in that: The reader further includes an RC oscillator X1, and the RC oscillator X1 is connected to the chip U2.

8. The RFID safety switch control circuit according to claim 7, characterized in that: The RFID safety switch control circuit also includes a power supply module, which includes a chip U4, a third interface J1 and a fourth interface J2, the third interface J1 and the fourth interface J2 are connected to the chip U4, the third interface J1 is connected to the power supply end, and the fourth interface J2 is connected to the power supply end, and the power supply module also includes a resistor R19, a capacitor C16, a capacitor C14, a resistor R5, a resistor R11, a diode D1, a diode D2, a voltage regulator diode Z1, a resistor R17, a resistor R15, a capacitor C13, an inductor L4, a resistor R12, a resistor R6, and a capacitor C15.

9. An RFID safety switch, characterized in that: The switch is controlled by using the RFID safety switch control circuit as described in any one of claims 1 to 8.

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