Electric shock protection device of portable plasma generator

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By designing the electric shock protection device of the portable plasma generator, the high-voltage sampling and voltage dividing circuit are used to monitor the change of voltage signal, and the protection of the human body contacts the high-voltage output end is achieved, which solves the problem of electric shock damage of the portable plasma generator and realizes the rapid protection and prompt function.

CN223156697UActive Publication Date: 2025-07-25WUXI ANMEILUO TECHNOLOGY CO LTD

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Patent Information

Application Number: CN202422305752.0
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-09-20
Publication Date: 2025-07-25
Estimated Expiration: 2034-09-20

AI Technical Summary

Technical Problem

An insulating sleeve is provided outside the output electrode of the portable plasma generator. If the insulating sleeve is damaged, the human body will be damaged by electric shock when contacting the output electrode. The existing technology lacks effective protection measures.

Method used

A portable plasma generator electric shock protection device is designed, including a high-voltage sampling and bucking circuit, a rectifier circuit, a voltage divider circuit, a capacitor and a comparator, which can protect the protection action by monitoring the change of voltage signals and prevent electric shock.

Benefits of technology

When the human body contacts the high-voltage output terminal, quickly stop the output voltage, protect the human body from electric shock or only minimal damage, and prompt the protection action through the indicator light.

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Abstract

The utility model provides an electric shock protection device of a portable plasma generator. The electric shock protection device comprises a high-voltage sampling step-down circuit, a rectification circuit, a first voltage division circuit, a capacitor C1, a second voltage division circuit, a capacitor C2, an anti-countercurrent diode D3, a comparator U1 and an output state locking circuit. The high-voltage sampling and voltage reducing circuit is used for sampling and voltage reducing from the high-voltage output end of the output transformer to obtain an alternating-current low-voltage sampling signal; the rectifying circuit is used for rectifying the alternating-current low-voltage sampling signal to obtain a direct-current low-voltage signal; the first voltage division circuit is used for dividing the DC low-voltage signal to obtain a first DC voltage division signal and sending the first DC voltage division signal to the first input end of the comparator U1; the capacitor C1 is used for keeping a first direct current voltage division signal in a normal state; the second voltage division circuit is used for dividing the direct-current low-voltage signal to obtain a second direct-current voltage division signal and sending the second direct-current voltage division signal to the second input end of the comparator U1; the capacitor C2 is used for keeping a second direct-current voltage division signal in a normal state; and electric shock injury can be prevented.

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Description

Technical Field

[0001] The utility model relates to a protection device, in particular to an electric shock protection device for a portable plasma generator. Background Art

[0002] A portable plasma generator can generate plasma and can quickly kill bacteria and microorganisms; therefore, it can be used for the treatment of skin diseases or the sterilization and disinfection of wounds.

[0003] An insulating sleeve is usually provided outside the output electrode of a portable plasma generator, and the output electrode is connected to the high-voltage output terminal of an output transformer; the voltage of the high-voltage output terminal of the output transformer is very high. If the insulating sleeve is damaged and a person accidentally touches the output electrode, it is equivalent to touching the high-voltage output terminal of the output transformer and will be electrocuted. Summary of the Invention

[0004] In view of the deficiencies in the prior art, an embodiment of the utility model provides an electric shock protection device for a portable plasma generator, so as to perform a protection action when a human body touches the high-voltage output terminal of the portable plasma generator and prevent electric shock injury. To achieve the above technical purposes, the technical solution adopted in the embodiment of the utility model is as follows:

[0005] An embodiment of the utility model provides an electric shock protection device for a portable plasma generator, including: a high-voltage sampling and step-down circuit, a rectification circuit, a first voltage division circuit, a capacitor C1, a second voltage division circuit, a capacitor C2, an anti-backflow diode D3, a comparator U1, and an output state locking circuit;

[0006] The high-voltage sampling and step-down circuit is used to sample and step down from the high-voltage output terminal of the output transformer to obtain an AC low-voltage sampling signal;

[0007] The rectification circuit is used to rectify the AC low-voltage sampling signal to obtain a DC low-voltage signal;

[0008] The first voltage division circuit is used to divide the DC low-voltage signal to obtain a first DC voltage division signal and send it to the first input terminal of the comparator U1; the capacitor C1 is used to maintain the first DC voltage division signal under normal conditions;

[0009] The second voltage division circuit is used to divide the DC low-voltage signal to obtain a second DC voltage division signal and send it to the second input terminal of the comparator U1; the capacitor C2 is used to maintain the second DC voltage division signal under normal conditions;

[0010] Under normal conditions, the first DC voltage division signal is greater than the second DC voltage division signal; the capacitor C2 is more than twice the capacitor C1; when the first DC voltage division signal is less than the second DC voltage division signal, the comparator U1 flips;

[0011] The anode of the anti - reverse - current diode D3 is connected to the input end of the first voltage - dividing circuit, and the cathode is connected to the input end of the second voltage - dividing circuit;

[0012] The output - state locking circuit is connected between the output end and the second input end of the comparator U1, and is used to lock the output state of the comparator U1 after the comparator U1 flips.

[0013] Specifically, the high - voltage sampling step - down circuit includes resistors R1 and R2, the rectifying circuit includes diodes D1 and D2, the first voltage - dividing circuit includes resistors R3 and R4, the second voltage - dividing circuit includes resistors R5 and R6, and the output - state locking circuit includes diode D4;

[0014] One end of resistor R1 is used to connect to the high - voltage output end of the output transformer, and the other end is connected to one end of resistor R2, the anode of diode D1, and the cathode of diode D2; the other end of resistor R2 is grounded; the anode of diode D2 is grounded; the cathode of diode D1 is connected to one end of resistor R3 and the anode of the anti - reverse - current diode D3. One end of resistor R3 is the input end of the first voltage - dividing circuit. The cathode of the anti - reverse - current diode D3 is connected to one end of resistor R5. One end of resistor R5 is the input end of the second voltage - dividing circuit; the other end of resistor R3 is connected to one end of resistor R4, one end of capacitor C1, and the inverting input end of comparator U1. The inverting input end of comparator U1 serves as its first input end. The other end of resistor R4 and the other end of capacitor C1 are grounded; the other end of resistor R5 is connected to one end of resistor R6, one end of capacitor C2, and the non - inverting input end of comparator U1. The non - inverting input end of comparator U1 serves as its second input end. The other end of resistor R6 and the other end of capacitor C2 are grounded; the anode of diode D4 is connected to the output end of comparator U1, and the cathode is connected to the non - inverting input end of comparator U1.

[0015] Alternatively, the high - voltage sampling step - down circuit includes resistors R1 and R2, the rectifying circuit includes diodes D1 and D2, the first voltage - dividing circuit includes resistors R3 and R4, the second voltage - dividing circuit includes resistors R5, R6, and R7, and the output - state locking circuit includes diode D4;

[0016] One end of the resistor R1 is used to connect to the high-voltage output terminal of the output transformer, and the other end is connected to one end of the resistor R2, the anode of the diode D1, and the cathode of the diode D2; the other end of the resistor R2 is grounded; the anode of the diode D2 is grounded; the cathode of the diode D1 is connected to one end of the resistor R3 and the anode of the anti-backflow diode D3. One end of the resistor R3 is the input terminal of the first voltage-dividing circuit, and the cathode of the anti-backflow diode D3 is connected to one end of the resistor R7. One end of the resistor R7 is the input terminal of the second voltage-dividing circuit; the other end of the resistor R3 is connected to one end of the resistor R4, one end of the capacitor C1, and the inverting input terminal of the comparator U1. The inverting input terminal of the comparator U1 serves as its first input terminal. The other end of the resistor R4 and the other end of the capacitor C1 are grounded; the other end of the resistor R7 is connected to one end of the resistor R5. The other end of the resistor R5 is connected to one end of the resistor R6 and the non-inverting input terminal of the comparator U1. The non-inverting input terminal of the comparator U1 serves as its second input terminal. One end of the capacitor C2 is connected to one end or the other end of the resistor R5. The other end of the resistor R6 and the other end of the capacitor C2 are grounded; the anode of the diode D4 is connected to the output terminal of the comparator U1, and the cathode is connected to the non-inverting input terminal of the comparator U1.

[0017] Further, the resistor R6 is configured to be composed of a fixed resistor in series with a variable resistor.

[0018] Further, the capacitance value of the capacitor C2 ranges from several μF to 30 μF, and the capacitance value of the capacitor C1 ranges from several tens of nF to 200 nF.

[0019] Further, the output terminal of the comparator U1 is also connected to the anode of the diode D5, and the cathode of the diode D5 is used to connect to the protection action execution circuit.

[0020] Further, the electric shock protection device of the portable plasma generator further includes an indication circuit;

[0021] The indication circuit includes a resistor R8 and an indication diode LED. One end of the resistor R8 is connected to the output terminal of the comparator U1, and the other end is connected to the anode of the indication diode LED. The cathode of the indication diode LED is grounded.

[0022] The beneficial effects brought by the technical solution provided by the embodiment of the present invention are: when a human body or other equivalent grounded object touches the high-voltage output terminal of the output transformer, a protection action can be quickly generated, so that the high-voltage output terminal of the output transformer stops outputting in time, protecting the human body from electric shock injury or only receiving minimal injury. Brief Description of the Drawings

[0023] Figure 1 It is the electrical block diagram in the embodiment of the present invention.

[0024] Figure 2 It is the electrical schematic diagram in the first embodiment of the present invention.

[0025] Figure 3 This is the electrical schematic diagram in the second embodiment of the present utility model. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0027] As Figure 1 shown, an electric shock protection device for a portable plasma generator proposed in an embodiment of the present utility model includes: a high-voltage sampling and step-down circuit 10, a rectification circuit 20, a first voltage division circuit 30, a capacitor C1, a second voltage division circuit 40, a capacitor C2, an anti-backflow diode D3, a comparator U1, and an output state locking circuit 50;

[0028] The high-voltage sampling and step-down circuit 10 is used to obtain an AC low-voltage sampling signal after sampling and step-down from the high-voltage output terminal of the output transformer;

[0029] The rectification circuit 20 is used to rectify the AC low-voltage sampling signal to obtain a DC low-voltage signal;

[0030] The first voltage division circuit 30 is used to divide the DC low-voltage signal to obtain a first DC voltage division signal and send it to the first input terminal of the comparator U1; the capacitor C1 is used to maintain the first DC voltage division signal under normal conditions;

[0031] The second voltage division circuit 40 is used to divide the DC low-voltage signal to obtain a second DC voltage division signal and send it to the second input terminal of the comparator U1; the capacitor C2 is used to maintain the second DC voltage division signal under normal conditions;

[0032] Under normal conditions, the first DC voltage division signal is greater than the second DC voltage division signal; the capacitor C2 is more than twice the capacitor C1; when the first DC voltage division signal is less than the second DC voltage division signal, the comparator U1 flips;

[0033] The anode of the anti-backflow diode D3 is connected to the input terminal of the first voltage division circuit 30, and the cathode is connected to the input terminal of the second voltage division circuit 40;

[0034] The output state locking circuit 50 is connected between the output terminal and the second input terminal of the comparator U1, and is used to lock the output state of the comparator U1 after the comparator U1 flips.

[0035] Embodiment 1, as Figure 2 shown;

[0036] In the first embodiment, the high-voltage sampling step-down circuit 10 includes resistors R1 and R2, the rectifier circuit 20 includes diodes D1 and D2, the first voltage-dividing circuit 30 includes resistors R3 and R4, the second voltage-dividing circuit 40 includes resistors R5 and R6, and the output state locking circuit 50 includes diode D4;

[0037] One end of resistor R1 is used to connect to the high-voltage output terminal of the output transformer, and the other end is connected to one end of resistor R2, the anode of diode D1, and the cathode of diode D2; the other end of resistor R2 is grounded; the anode of diode D2 is grounded; the cathode of diode D1 is connected to one end of resistor R3 and the anode of anti-backflow diode D3. One end of resistor R3 is the input terminal of the first voltage-dividing circuit 30. The cathode of anti-backflow diode D3 is connected to one end of resistor R5. One end of resistor R5 is the input terminal of the second voltage-dividing circuit 40; the other end of resistor R3 is connected to one end of resistor R4, one end of capacitor C1, and the inverting input terminal of comparator U1. The inverting input terminal of comparator U1 serves as its first input terminal. The other end of resistor R4 and the other end of capacitor C1 are grounded; the other end of resistor R5 is connected to one end of resistor R6, one end of capacitor C2, and the non-inverting input terminal of comparator U1. The non-inverting input terminal of comparator U1 serves as its second input terminal. The other end of resistor R6 and the other end of capacitor C2 are grounded; the anode of diode D4 is connected to the output terminal of comparator U1, and the cathode is connected to the non-inverting input terminal of comparator U1.

[0038] In this embodiment, resistor R6 is configured as a series connection of a fixed resistor and a variable resistor; in this way, the variable resistor can be adjusted so that the first DC voltage-dividing signal is slightly greater than the second DC voltage-dividing signal under normal conditions; capacitor C2 is much larger than capacitor C1. For example, the value of capacitor C2 ranges from several μF to 30 μF, and the value of capacitor C1 ranges from several tens of nF to 200 nF;

[0039] After the portable plasma generator is powered on, the voltage of capacitor C1 rises faster than that of capacitor C2, and comparator U1 outputs a low level. Under normal conditions, since the first DC voltage-dividing signal obtained by dividing the DC low-voltage signal by the first voltage-dividing circuit 30 is larger than the second DC voltage-dividing signal obtained by dividing the DC low-voltage signal by the second voltage-dividing circuit 40, the output of comparator U1 remains unchanged and is at a low level;

[0040] When a human body or other equivalent grounded object comes into contact with the high-voltage output terminal of the output transformer, the voltage of the high-voltage output terminal of the output transformer rapidly decreases. Capacitor C1 discharges through the first voltage-dividing circuit 30, and capacitor C2 discharges through the second voltage-dividing circuit 40. Since the capacitance of capacitor C1 is much smaller than that of capacitor C2, the voltage drop rate of capacitor C1 is much higher than that of capacitor C2. When the voltage of capacitor C1 is less than the voltage of capacitor C2 (the anti-backflow diode D3 can prevent current from flowing from capacitor C2 to capacitor C1), the comparator U1 flips, and the comparator U1 outputs a high level; the high voltage output by the comparator U1 is fed back to its non-inverting input terminal through the forward-set diode D4 to lock the output state of the comparator U1.

[0041] Further, the output terminal of the comparator U1 is also connected to the anode of the diode D5, and the cathode of the diode D5 is used to connect to the protection action execution circuit; in some embodiments, the protection action execution circuit can be the enable terminal of the driving chip of the output transformer. For example, if the enable terminal is effective at a low level, when the enable terminal is connected to a high level, the driving chip can cut off the output.

[0042] Further, the electric shock protection device of the portable plasma generator further includes an indication circuit 60. The indication circuit 60 includes a resistor R8 and an indication diode LED. One end of the resistor R8 is connected to the output terminal of the comparator U1, and the other end is connected to the anode of the indication diode LED. The cathode of the indication diode LED is grounded; when the comparator U1 flips, that is, a protection action occurs, the indication diode LED lights up.

[0043] Embodiment 2, as Figure 3 shown, the difference between Embodiment 2 and Embodiment 1 is that there is an additional resistor R7 in the second voltage-dividing circuit 40. The resistor R7 can play a current-limiting role; due to the presence of the resistor R7, the capacitor C2 can be connected to either end of the resistor R5;

[0044] In Embodiment 2, the high-voltage sampling step-down circuit 10 includes resistors R1 and R2, the rectifying circuit 20 includes diodes D1 and D2, the first voltage-dividing circuit 30 includes resistors R3 and R4, the second voltage-dividing circuit 40 includes resistors R5, R6, and R7, and the output state locking circuit 50 includes a diode D4;

[0045] One end of resistor R1 is used to connect to the high-voltage output terminal of the output transformer, and the other end is connected to one end of resistor R2, the anode of diode D1, and the cathode of diode D2; the other end of resistor R2 is grounded; the anode of diode D2 is grounded; the cathode of diode D1 is connected to one end of resistor R3 and the anode of anti-backflow diode D3. One end of resistor R3 is the input terminal of the first voltage-dividing circuit 30, and the cathode of anti-backflow diode D3 is connected to one end of resistor R7. One end of resistor R7 is the input terminal of the second voltage-dividing circuit 40; the other end of resistor R3 is connected to one end of resistor R4, one end of capacitor C1, and the inverting input terminal of comparator U1. The inverting input terminal of comparator U1 serves as its first input terminal. The other end of resistor R4 and the other end of capacitor C1 are grounded; the other end of resistor R7 is connected to one end of resistor R5. The other end of resistor R5 is connected to one end of resistor R6 and the non-inverting input terminal of comparator U1. The non-inverting input terminal of comparator U1 serves as its second input terminal. One end of capacitor C2 is connected to one end or the other end of resistor R5. The other end of resistor R6 and the other end of capacitor C2 are grounded; the anode of diode D4 is connected to the output terminal of comparator U1, and the cathode is connected to the non-inverting input terminal of comparator U1.

[0046] In this embodiment, resistor R6 is configured as a series connection of a fixed resistor and a variable resistor; in this way, the variable resistor can be adjusted so that the first DC voltage-dividing signal is slightly greater than the second DC voltage-dividing signal under normal conditions; capacitor C2 is much larger than capacitor C1. For example, the value of capacitor C2 ranges from several μF to 30 μF, and the value of capacitor C1 ranges from several tens of nF to 200 nF;

[0047] The rest is the same as in Embodiment 1.

[0048] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An electric shock protection device for a portable plasma generator, characterized in that, Comprising: A high-voltage sampling step-down circuit (10), a rectification circuit (20), a first voltage-dividing circuit (30), a capacitor C1, a second voltage-dividing circuit (40), a capacitor C2, an anti-backflow diode D3, a comparator U1, and an output state locking circuit (50); The high-voltage sampling step-down circuit (10) is used to obtain an AC low-voltage sampling signal after sampling and step-down from the high-voltage output terminal of the output transformer; The rectification circuit (20) is used to rectify the AC low-voltage sampling signal to obtain a DC low-voltage signal; The first voltage-dividing circuit (30) is used to divide the DC low-voltage signal to obtain a first DC voltage-divided signal and send it to the first input terminal of the comparator U1; the capacitor C1 is used to maintain the first DC voltage-divided signal under normal conditions; The second voltage-dividing circuit (40) is used to divide the DC low-voltage signal to obtain a second DC voltage-divided signal and send it to the second input terminal of the comparator U1; the capacitor C2 is used to maintain the second DC voltage-divided signal under normal conditions; Under normal conditions, the first DC voltage-divided signal is greater than the second DC voltage-divided signal; the capacitor C2 is more than twice the capacitor C1; when the first DC voltage-divided signal is less than the second DC voltage-divided signal, the comparator U1 flips; The anode of the anti-backflow diode D3 is connected to the input terminal of the first voltage-dividing circuit (30), and the cathode is connected to the input terminal of the second voltage-dividing circuit (40); The output state locking circuit (50) is connected between the output terminal and the second input terminal of the comparator U1, and is used to lock the output state of the comparator U1 after the comparator U1 flips.

2. The electric shock protection device of the portable plasma generator according to claim 1, wherein The high-voltage sampling step-down circuit (10) includes resistors R1 and R2, the rectification circuit (20) includes diodes D1 and D2, the first voltage-dividing circuit (30) includes resistors R3 and R4, the second voltage-dividing circuit (40) includes resistors R5 and R6, and the output state locking circuit (50) includes a diode D4; One end of the resistor R1 is used to connect to the high-voltage output terminal of the output transformer, and the other end is connected to one end of the resistor R2, the anode of the diode D1, and the cathode of the diode D2; the other end of the resistor R2 is grounded; the anode of the diode D2 is grounded; the cathode of the diode D1 is connected to one end of the resistor R3 and the anode of the anti-backflow diode D3, one end of the resistor R3 is the input terminal of the first voltage-dividing circuit (30), the cathode of the anti-backflow diode D3 is connected to one end of the resistor R5, and one end of the resistor R5 is the input terminal of the second voltage-dividing circuit (40); the other end of the resistor R3 is connected to one end of the resistor R4, one end of the capacitor C1, and the inverting input terminal of the comparator U1, the inverting input terminal of the comparator U1 serves as its first input terminal, the other end of the resistor R4 and the other end of the capacitor C1 are grounded; the other end of the resistor R5 is connected to one end of the resistor R6, one end of the capacitor C2, and the non-inverting input terminal of the comparator U1, the non-inverting input terminal of the comparator U1 serves as its second input terminal, the other end of the resistor R6 and the other end of the capacitor C2 are grounded; the anode of the diode D4 is connected to the output terminal of the comparator U1, and the cathode is connected to the non-inverting input terminal of the comparator U1.

3. The electric shock protection device of the portable plasma generator according to claim 1, characterized in that The high-voltage sampling step-down circuit (10) includes resistors R1 and R2, the rectifying circuit (20) includes diodes D1 and D2, the first voltage dividing circuit (30) includes resistors R3 and R4, the second voltage dividing circuit (40) includes resistors R5, R6, and R7, and the output state locking circuit (50) includes diode D4; One end of resistor R1 is used to connect to the high-voltage output terminal of the output transformer, and the other end is connected to one end of resistor R2, the anode of diode D1, and the cathode of diode D2; the other end of resistor R2 is grounded; the anode of diode D2 is grounded; the cathode of diode D1 is connected to one end of resistor R3 and the anode of anti-backflow diode D3. One end of resistor R3 is the input terminal of the first voltage dividing circuit (30). The cathode of anti-backflow diode D3 is connected to one end of resistor R7. One end of resistor R7 is the input terminal of the second voltage dividing circuit (40); the other end of resistor R3 is connected to one end of resistor R4, one end of capacitor C1, and the inverting input terminal of comparator U1. The inverting input terminal of comparator U1 serves as its first input terminal. The other end of resistor R4 and the other end of capacitor C1 are grounded; the other end of resistor R7 is connected to one end of resistor R5. The other end of resistor R5 is connected to one end of resistor R6 and the non-inverting input terminal of comparator U1. The non-inverting input terminal of comparator U1 serves as its second input terminal. One end of capacitor C2 is connected to one end or the other end of resistor R5. The other end of resistor R6 and the other end of capacitor C2 are grounded; the anode of diode D4 is connected to the output terminal of comparator U1, and the cathode is connected to the non-inverting input terminal of comparator U1.

4. The electric shock protection device of the portable plasma generator according to claim 2 or 3, characterized in that Resistor R6 is configured as a series connection of a fixed resistor and a variable resistor.

5. The electric shock protection device of the portable plasma generator according to claim 2 or 3, characterized in that Capacitor C2 has a value of several μF to 30 μF, and capacitor C1 has a value of several tens of nF to 200 nF.

6. The electric shock protection device of the portable plasma generator according to claim 1, 2, or 3, characterized in that The output terminal of comparator U1 is also connected to the anode of diode D5, and the cathode of diode D5 is used to connect to the protection action execution circuit.

7. The electric shock protection device of the portable plasma generator according to claim 1, 2 or 3, characterized in that, It further includes an indication circuit (60); The indication circuit (60) includes resistor R8 and indication diode LED. One end of resistor R8 is connected to the output terminal of comparator U1, and the other end is connected to the anode of indication diode LED. The cathode of indication diode LED is grounded.