Protective shoes with step voltage detection alarm

Abstract

This invention discloses a protective shoe with step voltage detection alarm, relating to the field of voltage detection technology. The protective shoe includes: a shoe body, two electrode plates, and a voltage detection circuit board. The two electrode plates are spaced apart at the bottom of the shoe body and are used to contact the ground. The voltage detection circuit board is embedded in the bottom of the shoe body. The voltage detection circuit board has a differential proportional calculation circuit, a controller, and an alarm circuit connected in sequence. The input terminal of the differential proportional calculation circuit is connected to the two electrode plates respectively. The differential proportional calculation circuit is used to detect the voltage difference between the two electrode plates and output to the controller. The controller is used to compare the voltage difference between the two electrode plates with a preset value and drive the alarm circuit to issue an alarm signal when the voltage difference is greater than the preset value. It can monitor the step voltage under the worker's feet in real time and issue an alarm signal, playing an early warning role, expanding the monitoring area, eliminating the need for handheld operation, improving work efficiency, and ensuring the safety of the worker.

Description

Technical Field

[0001] This invention relates to the field of voltage detection technology, and in particular to a protective shoe with step voltage detection alarm. Background Technology

[0002] In on-site operations such as power system operation and maintenance, fault repair, and lightning disaster response, when high-voltage transmission lines break and fall to the ground, or when equipment experiences grounding faults, a ring-shaped potential distribution is formed around the point of impact. The potential difference generated between a person's feet when walking on the ground is called step voltage. When the step voltage exceeds the safety threshold, it can lead to electric shock and injury, posing a significant safety risk to power field operations.

[0003] In the existing technology, the protection methods against step voltage are mainly divided into two categories: passive insulation protection by blocking the current path through highly insulated shoe soles, and fixed or handheld step voltage detection devices.

[0004] However, highly insulated shoe soles can only provide passive insulation and cannot provide early warning of risks; fixed detection devices have limited coverage of fixed areas, and handheld detection devices affect work efficiency, making it difficult to monitor the step voltage under the worker's feet in real time, resulting in detection lag. Summary of the Invention

[0005] This invention provides a protective shoe with step voltage detection alarm to solve the technical problems of existing high-insulation shoe soles that can only passively insulate and cannot provide early warning of risks; fixed detection devices have limited coverage of fixed areas and handheld detection devices affect work efficiency, both of which are difficult to monitor the step voltage under the worker's feet in real time and have detection lag.

[0006] This invention provides a protective shoe with step voltage detection alarm, comprising: Shoe body; Two electrode plates are spaced apart on the bottom of the shoe body and used to contact the ground; A voltage detection circuit board is embedded in the bottom of the shoe body. The voltage detection circuit board is provided with a differential proportional calculation circuit, a controller, and an alarm circuit connected in sequence. The input terminal of the differential proportional calculation circuit is connected to the two electrode plates respectively. The differential proportional operation circuit is used to detect the voltage difference between the two electrode plates and output it to the controller. The controller is used to compare the voltage difference between the two electrode plates with a preset value and drive the alarm circuit to issue an alarm signal when the voltage difference is greater than the preset value.

[0007] In some embodiments, the differential scaling circuit includes: First operational amplifier, second operational amplifier, fifth resistor, sixth resistor, seventh resistor, eighth resistor; The non-inverting input of the first operational amplifier is connected to the first electrode plate, the output of the first operational amplifier is connected to the input pin of the controller, the first end of the fifth resistor is connected to the second electrode plate, the second end of the fifth resistor is connected to the inverting input of the first operational amplifier, the first end of the sixth resistor is connected to the second end of the fifth resistor and the inverting input of the first operational amplifier, and the second end of the sixth resistor is connected to the output of the first operational amplifier. The non-inverting input of the second operational amplifier is connected to the second electrode plate, the output of the second operational amplifier is connected to the input pin of the controller, the first end of the seventh resistor is connected to the first electrode plate, the second end of the seventh resistor is connected to the inverting input of the second operational amplifier, the first end of the eighth resistor is connected to the second end of the seventh resistor and the inverting input of the second operational amplifier, and the second end of the eighth resistor is connected to the output of the second operational amplifier.

[0008] In some embodiments, the alarm circuit includes: Transistor, third resistor, LED, buzzer, first resistor, second resistor; The first end of the third resistor is connected to the output pin of the controller, the second end of the third resistor is connected to the base of the transistor, the first end of the first resistor is connected to the power supply, the second end of the first resistor is connected to the anode of the light-emitting diode, the cathode of the light-emitting diode is connected to the collector of the transistor, the first end of the second resistor is connected to the power supply, the second end of the second resistor is connected to the first end of the buzzer, the second end of the buzzer is connected to the collector of the transistor, and the emitter of the transistor is grounded.

[0009] In some embodiments, the protective shoe with step voltage detection alarm further includes: The fourth resistor has its first end connected to the output pin of the controller and the first end of the third resistor, and its second end connected to the negative reference voltage pin of the controller and grounded.

[0010] In some embodiments, the protective shoe with step voltage detection alarm further includes: A voltage regulator circuit, comprising a voltage regulator, a first capacitor, and a second capacitor; The first terminal of the voltage regulator is connected to the power supply, the second terminal of the voltage regulator is connected to the power input pin of the controller, the third terminal of the voltage regulator is grounded, the first terminal of the first capacitor is connected to the first terminal of the voltage regulator, the second terminal of the first capacitor is grounded, the first terminal of the second capacitor is connected to the second terminal of the voltage regulator, and the second terminal of the second capacitor is grounded.

[0011] In some embodiments, the protective shoe with step voltage detection alarm further includes: A reference voltage source circuit, comprising a voltage reference chip, a third capacitor, and a fourth capacitor; The first terminal of the voltage reference chip is connected to the power supply, the second terminal of the voltage reference chip is connected to the positive reference voltage pin of the controller, the third terminal of the voltage reference chip is grounded, the first terminal of the third capacitor is connected to the first terminal of the voltage reference chip, the second terminal of the third capacitor is grounded, the first terminal of the fourth capacitor is connected to the second terminal of the voltage reference chip, and the second terminal of the fourth capacitor is grounded.

[0012] In some embodiments, the protective shoe with step voltage detection alarm further includes: A power switch, the first end of which is connected to a power source, and the second end of which is connected to the alarm circuit, the first end of the voltage regulator, and the first end of the voltage reference chip.

[0013] In some embodiments, the controller is an ESP32S3 microcontroller, the voltage regulator is an AMS1117-3.3, and the voltage reference chip is a REF330.

[0014] In some embodiments, the bottom of the shoe body is provided with an inner lining layer, a first insulating protective layer, a puncture-resistant layer, a second insulating protective layer, and an abrasion-resistant bottom layer from top to bottom, and the heel of the shoe body is also provided with a waterproof protective chamber; The two electrode plates are spaced apart between the second insulating protective layer and the wear-resistant bottom layer, and the voltage detection circuit board is located inside the waterproof protective chamber.

[0015] In some embodiments, both the first and second insulating protective layers are made of highly insulating natural rubber material, and the waterproof protective chamber is made of ABS plastic.

[0016] The beneficial effects of the technical solution provided by this invention include: This invention provides a protective shoe with step voltage detection and alarm, comprising: a shoe body, two electrode plates, and a voltage detection circuit board. The two electrode plates are spaced apart at the bottom of the shoe body and are used to contact the ground. The voltage detection circuit board is embedded in the bottom of the shoe body. The voltage detection circuit board has a differential proportional calculation circuit, a controller, and an alarm circuit connected in sequence. The input terminal of the differential proportional calculation circuit is connected to the two electrode plates respectively. The differential proportional calculation circuit is used to detect the voltage difference between the two electrode plates and output it to the controller. The controller is used to compare the voltage difference between the two electrode plates with a preset value and drive the alarm circuit to issue an alarm signal when the voltage difference is greater than the preset value. It can monitor the step voltage under the worker's feet in real time and issue an alarm signal, which plays an early warning role, expands the monitoring area, eliminates the need for handheld operation, improves work efficiency, and ensures the safety of the worker. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a circuit diagram of a voltage detection circuit board provided in an embodiment of the present invention; Figure 2 A side view of a protective shoe with step voltage detection alarm provided in an embodiment of the present invention; Figure 3 A bottom view of a protective shoe with step voltage detection alarm provided in an embodiment of the present invention; Figure label: 1. Voltage regulator circuit; 2. Controller; 3. Alarm circuit; 4. Reference voltage source circuit; 6. Shoe body; 7. Electrode plates; 8. Voltage detection circuit board. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides a protective shoe with step voltage detection alarm, which solves the technical problems of existing high-insulation shoe soles that can only passively insulate and cannot provide early warning of risks; fixed detection devices have limited coverage of fixed areas and handheld detection devices affect work efficiency, making it difficult to monitor the step voltage under the worker's feet in real time, resulting in detection lag.

[0021] Figure 1 and Figure 2 This invention provides a protective shoe with step voltage detection alarm, comprising: shoe body 6, two electrode plates 7, and voltage detection circuit board 8.

[0022] Two electrode plates 7 are spaced apart at the bottom of the shoe body 6 and are used to contact the ground. The voltage detection circuit board 8 is embedded in the bottom of the shoe body 6. The voltage detection circuit board 8 is provided with a differential proportional calculation circuit 5, a controller 2, and an alarm circuit 3 connected in sequence. The input terminal of the differential proportional calculation circuit 5 is connected to the two electrode plates 7 respectively. The differential proportional calculation circuit 5 is used to detect the voltage difference between the two electrode plates 7 and output it to the controller 2. The controller 2 is used to compare the voltage difference between the two electrode plates 7 with a preset value and drive the alarm circuit 3 to issue an alarm signal when the voltage difference is greater than the preset value.

[0023] This invention relates to a protective shoe with step voltage detection and alarm, comprising a shoe body, two electrode plates, and a voltage detection circuit board. The two electrode plates are spaced apart at the bottom of the shoe body and are used to contact the ground. The voltage detection circuit board is embedded in the bottom of the shoe body and has a differential proportional calculation circuit, a controller, and an alarm circuit connected in sequence on it. The input terminal of the differential proportional calculation circuit is connected to the two electrode plates respectively. The differential proportional calculation circuit is used to detect the voltage difference signal between the front and rear electrode plates of the shoe body, perform proportional calculation on it, and output it to the controller. The controller compares the voltage difference between the two electrode plates with a preset value. When the voltage difference between the two electrode plates at the front and back of the shoe is greater than the preset value, the controller outputs a square wave signal of a specific frequency to control the switching of the transistor in the alarm circuit. This further controls the LED of the alarm circuit to flash at a specific frequency and the buzzer to sound at a specific frequency, thus realizing an audible and visual alarm function. The controller can monitor the step voltage under the worker's feet in real time and issue an alarm signal, providing early warning. The monitoring area is not fixed and is not limited, expanding the monitoring area and eliminating the need for handheld operation, thereby improving work efficiency and ensuring the safety of the worker.

[0024] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1As shown, the differential proportional operational circuit 5 includes: a first operational amplifier U2, a second operational amplifier U3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. The non-inverting input terminal of the first operational amplifier U2 is connected to the first electrode 7, and the output terminal of the first operational amplifier U2 is connected to the input pin of the controller 2. The first terminal of the fifth resistor R5 is connected to the second electrode 7, and the second terminal of the fifth resistor R5 is connected to the inverting input terminal of the first operational amplifier U2. The first terminal of the sixth resistor R6 is connected to the second terminal of the fifth resistor R5 and the inverting input terminal of the first operational amplifier U2. The second end of the sixth resistor R6 is connected to the output of the first operational amplifier U2; the non-inverting input of the second operational amplifier U3 is connected to the second electrode 7, and the output of the second operational amplifier U3 is connected to the input pin of the controller 2; the first end of the seventh resistor R7 is connected to the first electrode 7, and the second end of the seventh resistor R7 is connected to the inverting input of the second operational amplifier U3; the first end of the eighth resistor R8 is connected to the second end of the seventh resistor R7 and the inverting input of the second operational amplifier U3, and the second end of the eighth resistor R8 is connected to the output of the second operational amplifier U3.

[0025] Specifically, the differential proportional operation circuit 5 is used to detect the voltage difference signal between the two electrode plates 7 at the front and rear of the shoe body 6, perform proportional operation on it, and output it to the controller 2. The first operational amplifier U2 and the second operational amplifier U3 are selected from OPA series integrated operational amplifiers with high common mode rejection ratio, which can improve the operation accuracy. The output voltage Uo1 of the first operational amplifier U2 is: ; The output voltage Uo1 of the first operational amplifier U2 is acquired by the ADC module of the controller 2, that is, the actual voltage value of the output voltage Uo1 of the first operational amplifier U2 is: ; Wherein, ADC_CH6 is the quantization encoding value when the ADC module channel 6 of the controller 2 is sampled; The output voltage Uo2 of the second operational amplifier U3 is: ; The output voltage Uo2 of the second operational amplifier U3 is acquired by the ADC module of the controller 2, that is, the actual voltage value of the output voltage Uo2 of the second operational amplifier U3 is: ; Wherein, ADC_CH7 is the quantization encoding value when the ADC module channel 7 of the controller 2 is sampled; Since the direction of the electric field is uncertain, two differential operational amplifiers, the first operational amplifier U2 and the second operational amplifier U3, are used to collect the voltage between the two electrode plates 7 on the sole of the shoe. When the voltage between any two electrode plates is greater than the preset value, an audible and visual alarm will be issued to remind personnel to pay attention to safety.

[0026] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 As shown, the alarm circuit 3 includes: a transistor Q, a third resistor R3, a light-emitting diode D, a buzzer B, a first resistor R1, and a second resistor R2; the first end of the third resistor R3 is connected to the output pin IO32 of the controller 2, the second end of the third resistor R3 is connected to the base of the transistor Q, the first end of the first resistor R1 is connected to the power supply, the second end of the first resistor R1 is connected to the anode of the light-emitting diode D, the cathode of the light-emitting diode D is connected to the collector of the transistor Q, the first end of the second resistor R2 is connected to the power supply, the second end of the second resistor R2 is connected to the first end of the buzzer B, the second end of the buzzer B is connected to the collector of the transistor Q, and the emitter of the transistor Q is grounded.

[0027] Specifically, when the voltage difference between the two electrode plates 7 at the front and rear of the shoe body 6 is greater than a preset value, the output terminal of the controller 2 outputs a square wave signal of a specific frequency to control the switching of the transistor Q. The switching of the transistor Q further controls the LED D to flash at a specific frequency and the buzzer B to sound at a specific frequency, realizing the sound and light alarm function and playing an early warning role. The first resistor R1 is used to limit the current flowing through the LED D to prevent the LED D from being damaged due to excessive current. The brightness of the LED D can also be adjusted by changing the resistance value of the first resistor R1. The second resistor R2 is used to limit the current flowing through the buzzer B to prevent the buzzer B from being damaged due to excessive current. The volume of the buzzer B can also be adjusted by changing the resistance value of the second resistor R2. The third resistor R3 is used to limit the current flowing through the transistor Q to prevent the current at the IO port of the controller 2 from being too large due to a short circuit of the transistor Q, which can effectively protect the controller 2.

[0028] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1As shown, the protective shoe with step voltage detection alarm further includes: a fourth resistor R4, the first end of which is connected to the output pin IO32 of the controller 2 and the first end of the third resistor R3, and the second end of which is connected to the negative reference voltage pin SENSOR-VN of the controller 2 and grounded. The fourth resistor R4 is used to pull the level of the IO32 port of the controller 2 to a low level when idle, to prevent the transistor Q from being mis-conducted and causing the alarm circuit 3 to falsely alarm, thereby improving the detection and early warning accuracy of the protective shoe with step voltage detection alarm in this embodiment of the invention.

[0029] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 As shown, the protective shoe with step voltage detection alarm further includes: a voltage regulator circuit 1, which includes a voltage regulator, a first capacitor C1, and a second capacitor C2; the first terminal of the voltage regulator is connected to the power supply, the second terminal of the voltage regulator is connected to the power input pin of the controller 2, and the third terminal of the voltage regulator is grounded; the first terminal of the first capacitor C1 is connected to the first terminal of the voltage regulator, and the second terminal of the first capacitor C1 is grounded; the first terminal of the second capacitor C2 is connected to the second terminal of the voltage regulator, and the second terminal of the second capacitor C2 is grounded; the voltage regulator is used to stabilize the voltage output from the power supply (5V lithium battery) at 3.3V, and then the voltage regulator outputs the 3.3V voltage to the controller 2 and powers the controller 2 to match the voltage requirements of the controller 2, preventing the chip from being damaged by excessively high voltage or the malfunction from being caused by excessively low voltage; the first capacitor C1 and the second capacitor C2 mainly play a filtering role, which can smooth the output voltage, reduce voltage fluctuations and ripple, thereby improving the stability and reliability of the circuit.

[0030] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1As shown, the protective shoe with step voltage detection alarm further includes: a reference voltage source circuit 4, which includes a voltage reference chip, a third capacitor C3, and a fourth capacitor C4; the first terminal of the voltage reference chip is connected to the power supply, the second terminal of the voltage reference chip is connected to the positive reference voltage pin SENSOR-VP of the controller 2, the third terminal of the voltage reference chip is grounded, the first terminal of the third capacitor C3 is connected to the first terminal of the voltage reference chip, the second terminal of the third capacitor C3 is grounded, the first terminal of the fourth capacitor C4 is connected to the second terminal of the voltage reference chip, and the second terminal of the fourth capacitor C4 is grounded. The voltage reference chip is used to provide a stable reference voltage of 3.3V for the ADC module of the controller 2, eliminating measurement errors caused by battery voltage drop or temperature changes, ensuring the accuracy of step voltage detection data and the reliability of alarm threshold judgment. The third capacitor C3 and the fourth capacitor C4 mainly play a filtering role, which can smooth the output voltage, reduce voltage fluctuations and ripples, thereby improving the stability and reliability of the circuit.

[0031] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 As shown, the protective shoe with step voltage detection alarm also includes: a power switch SW, the first end of the power switch SW is connected to the power supply, and the second end of the power switch SW is connected to the alarm circuit 3, the first end of the voltage regulator, and the first end of the voltage reference chip respectively. The power switch SW is used to control the connection and disconnection of the entire circuit with the power supply. By disconnecting the power supply through the power switch SW, it is ensured that the circuit is completely de-energized when the protective shoe is not in operation, eliminating static power consumption and preventing the battery from being accidentally depleted.

[0032] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 As shown, the controller 2 is an ESP32S3 microcontroller, the voltage regulator is an AMS1117-3.3, and the voltage reference chip is a REF330. The ESP32S3 microcontroller can achieve high-speed sampling and real-time calculation, ensuring low hysteresis in step voltage detection and meeting the technical requirements of real-time early warning. The use of a linear regulated power supply AMS1117-3.3 instead of a switching regulated power supply is mainly to provide a clean power supply with low noise and high ripple suppression, which can reduce the interference of power supply noise on the internal circuits of the controller 2 and the surrounding analog circuits. The REF330 voltage reference chip has advantages such as extremely low temperature coefficient, high initial accuracy, and low output noise.

[0033] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 and Figure 3As shown, the bottom of the shoe body 6, from top to bottom, is provided with an inner lining layer, a first insulating protective layer, a puncture-resistant layer, a second insulating protective layer, and an abrasion-resistant bottom layer. The heel of the shoe body 6 also has a waterproof protective chamber. Two electrode plates 7 are spaced apart between the second insulating protective layer and the abrasion-resistant bottom layer. The voltage detection circuit board 8 is located inside the waterproof protective chamber. The bottom surfaces of the two electrode plates 7 are flush with the bottom surface of the abrasion-resistant bottom layer and in direct contact with the ground. The two electrode plates 7 are distributed one on the forefoot and one on the heel, which ensures reliable contact between the electrode plates 7 and the ground to collect and detect the potential difference, while avoiding direct exposure of the electrode plates 7 to the outside, which is susceptible to mechanical damage. Furthermore, a high-impedance path is constructed through the first insulating protective layer and the second insulating protective layer to block the current from flowing from the ground to the human body. The puncture-resistant layer provides resistance to punctures by sharp objects, the abrasion-resistant bottom layer provides anti-friction capabilities, and the inner lining layer makes the protective shoe comfortable to wear. The waterproof protective chamber can buffer external impact forces and protect the fragile internal voltage detection circuit board 8 and components from damage.

[0034] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 and Figure 3 As shown, both the first and second insulating protective layers are made of highly insulating natural rubber material, and the waterproof protective chamber is made of ABS plastic. Natural rubber has excellent wear resistance, anti-slip properties and flexibility, which can block the flow of current through the human body. It can withstand mechanical wear at the work site and ensure wearing comfort. ABS plastic has excellent impact resistance and good processing performance, which can effectively absorb impact energy and reduce the risk of circuit failure due to vibration or impact.

[0035] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0036] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A protective shoe with step voltage detection alarm, characterized in that, include: Shoe body (6); Two electrode plates (7) are spaced apart at the bottom of the shoe body (6) and used to contact the ground; Voltage detection circuit board (8), the voltage detection circuit board (8) is embedded in the bottom of the shoe body (6), the voltage detection circuit board (8) is provided with a differential proportional operation circuit (5), a controller (2) and an alarm circuit (3) connected in sequence, and the input terminal of the differential proportional operation circuit (5) is connected to the two electrode plates (7) respectively. The differential proportional operation circuit (5) is used to detect the voltage difference between the two electrode plates (7) and output it to the controller (2). The controller (2) is used to compare the voltage difference between the two electrode plates (7) with a preset value and drive the alarm circuit (3) to issue an alarm signal when the voltage difference is greater than the preset value.

2. The protective shoe with step voltage detection alarm according to claim 1, characterized in that, The differential proportional operation circuit (5) includes: First operational amplifier, second operational amplifier, fifth resistor, sixth resistor, seventh resistor, eighth resistor; The non-inverting input terminal of the first operational amplifier is connected to the first electrode plate (7), the output terminal of the first operational amplifier is connected to the input pin of the controller (2), the first end of the fifth resistor is connected to the second electrode plate (7), the second end of the fifth resistor is connected to the inverting input terminal of the first operational amplifier, the first end of the sixth resistor is connected to the second end of the fifth resistor and the inverting input terminal of the first operational amplifier, and the second end of the sixth resistor is connected to the output terminal of the first operational amplifier. The non-inverting input of the second operational amplifier is connected to the second electrode (7), the output of the second operational amplifier is connected to the input pin of the controller (2), the first end of the seventh resistor is connected to the first electrode (7), the second end of the seventh resistor is connected to the inverting input of the second operational amplifier, the first end of the eighth resistor is connected to the second end of the seventh resistor and the inverting input of the second operational amplifier, and the second end of the eighth resistor is connected to the output of the second operational amplifier.

3. The protective shoe with step voltage detection alarm according to claim 1, characterized in that, The alarm circuit (3) includes: Transistor, third resistor, LED, buzzer, first resistor, second resistor; The first end of the third resistor is connected to the output pin of the controller (2), the second end of the third resistor is connected to the base of the transistor, the first end of the first resistor is connected to the power supply, the second end of the first resistor is connected to the positive terminal of the light-emitting diode, the negative terminal of the light-emitting diode is connected to the collector of the transistor, the first end of the second resistor is connected to the power supply, the second end of the second resistor is connected to the first end of the buzzer, the second end of the buzzer is connected to the collector of the transistor, and the emitter of the transistor is grounded.

4. The protective shoe with step voltage detection alarm according to claim 3, characterized in that, Also includes: The fourth resistor has its first end connected to the output pin of the controller (2) and the first end of the third resistor, and its second end connected to the negative reference voltage pin of the controller (2) and grounded.

5. The protective shoe with step voltage detection alarm according to claim 1, characterized in that, Also includes: A voltage regulator circuit (1) includes a voltage regulator, a first capacitor, and a second capacitor; The first end of the voltage regulator is connected to the power supply, the second end of the voltage regulator is connected to the power input pin of the controller (2), the third end of the voltage regulator is grounded, the first end of the first capacitor is connected to the first end of the voltage regulator, the second end of the first capacitor is grounded, the first end of the second capacitor is connected to the second end of the voltage regulator, and the second end of the second capacitor is grounded.

6. The protective shoe with step voltage detection alarm according to claim 5, characterized in that, Also includes: The reference voltage source circuit (4) includes a voltage reference chip, a third capacitor, and a fourth capacitor; The first end of the voltage reference chip is connected to the power supply, the second end of the voltage reference chip is connected to the positive reference voltage pin of the controller (2), the third end of the voltage reference chip is grounded, the first end of the third capacitor is connected to the first end of the voltage reference chip, the second end of the third capacitor is grounded, the first end of the fourth capacitor is connected to the second end of the voltage reference chip, and the second end of the fourth capacitor is grounded.

7. The protective shoe with step voltage detection alarm according to claim 6, characterized in that, Also includes: A power switch, the first end of which is connected to a power source, and the second end of which is connected to the alarm circuit (3), the first end of the voltage regulator, and the first end of the voltage reference chip.

8. The protective shoe with step voltage detection alarm according to claim 6, characterized in that: The controller (2) is an ESP32S3 microcontroller, the voltage regulator is an AMS1117-3.3, and the voltage reference chip is a REF330.

9. The protective shoe with step voltage detection alarm according to claim 1, characterized in that: The bottom of the shoe body (6) is provided with an inner lining layer, a first insulating protective layer, a puncture-proof layer, a second insulating protective layer, and a wear-resistant bottom layer from top to bottom. The heel of the shoe body (6) is also provided with a waterproof protective chamber. The two electrode plates (7) are spaced apart between the second insulating protective layer and the wear-resistant bottom layer, and the voltage detection circuit board (8) is located inside the waterproof protective chamber.

10. The protective shoe with step voltage detection alarm according to claim 9, characterized in that: Both the first and second insulating protective layers are made of highly insulating natural rubber material, and the waterproof protective compartment is made of ABS plastic.

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