An electrocautery-type inoculation loop control circuit
By introducing a current switch control unit and a PMOS transistor into the electrocautery seeding ring, the problem of insufficient current carrying capacity is solved, and safety and portability are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 贾会生
- Filing Date
- 2025-07-30
- Publication Date
- 2026-06-16
AI Technical Summary
Existing electrocautery inoculation rings have limited current carrying capacity of switching elements when faced with high current, which can easily lead to switch failure and safety hazards.
The system employs a seed ring heating unit, a power input unit, and a current switch control unit. The current switch control unit controls the current to turn it on and off, thereby improving the current carrying capacity. A PMOS transistor is used for current regulation to protect the switch.
It effectively improves the current carrying capacity of the electrocautery inoculation ring, avoids switch burnout, and improves safety and portability.
Smart Images
Figure CN224366331U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of electrocautery inoculation rings, and specifically relates to a control circuit for an electrocautery inoculation ring. Background Technology
[0002] Electrocautery inoculation loops, as indispensable high-temperature infrared sterilization and disinfection equipment in laboratories, have been widely used in experimental operations in fields such as microbiology, biomedicine, and environmental science due to their significant advantages, including small size, light weight, convenient operation, flameless operation, and safety and environmental friendliness. However, there are still a series of key technical issues that need to be addressed in the current market for electrocautery inoculation loops.
[0003] Specifically, existing circuit designs for electrocautery inoculation rings generally employ traditional low-current switching elements. These elements are ill-suited to handle the large currents required for the operation of electrocautery inoculation rings (typically reaching several amperes or even higher). Due to the limited current carrying capacity of the switching elements, prolonged or high-frequency high current flow can easily cause the internal contacts of the switch to burn or melt, leading to switch failure and even serious safety hazards such as short circuits and fires.
[0004] Therefore, there is an urgent need to provide an electrocautery inoculation ring control circuit that can improve current carrying capacity and safety. Utility Model Content
[0005] The purpose of this invention is to provide a control circuit for an electrocautery inoculation ring, in order to solve the above-mentioned problems existing in the prior art.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] This utility model provides a control circuit for an electrocautery inoculation ring, including: an inoculation ring heating unit, a power input unit, and a current switch control unit;
[0008] The power input terminal of the power input unit is electrically connected to the external mains power, the power output terminal of the power input unit is electrically connected to the input terminal of the current switch control unit, and the output terminal of the current switch control unit is electrically connected to the controlled terminal of the inoculation ring heating unit.
[0009] In one possible design, the inoculation ring heating unit includes a heating wire;
[0010] The heating wire serves as the controlled end of the inoculation ring heating unit and is electrically connected to the output end of the current switch control unit.
[0011] In one possible design, the power input unit includes a voltage conversion subunit and a power filtering subunit;
[0012] The AC input terminal of the voltage conversion subunit serves as the power input terminal of the power input unit and is electrically connected to an external 220V AC mains power supply. The DC output terminal of the voltage conversion subunit is electrically connected to the input terminal of the power filtering subunit. The filtered current output terminal of the power filtering subunit serves as the power output terminal of the power input unit and is electrically connected to the input terminal of the current switch control unit.
[0013] In one possible design, the voltage conversion subunit includes a 220V-12V step-down converter, a bridge rectifier circuit, and an LC filter circuit.
[0014] The primary terminal of the 220V-12V step-down transformer serves as the AC input terminal of the voltage conversion subunit and is electrically connected to the external 220V AC mains power. The secondary terminal of the 220V-12V step-down transformer is electrically connected to the first and second input terminals of the bridge rectifier circuit. The first and second output terminals of the bridge rectifier circuit are electrically connected to the input terminal of the LC filter circuit. The output terminal of the LC filter circuit serves as the DC output terminal of the voltage conversion subunit and is electrically connected to the input terminal of the power supply filter subunit.
[0015] In one possible design, the power supply filtering subunit includes a third resistor, a first capacitor, and a second light-emitting diode;
[0016] Wherein, one end of the third resistor is electrically connected to one end of the first capacitor, and the common connection of the third resistor and the first capacitor serves as the input terminal of the power supply filtering subunit and is electrically connected to the DC output terminal of the voltage conversion subunit. The other end of the third resistor is electrically connected to one end of the second light-emitting diode, and the other end of the second light-emitting diode is electrically connected to the other end of the first capacitor. The common connection of the second light-emitting diode and the first capacitor serves as the filter current output terminal of the power supply filtering subunit and is electrically connected to the input terminal of the current switch control unit.
[0017] In one possible design, the current switch control unit includes a switching subunit and a current control subunit;
[0018] The input terminal of the switch subunit serves as the input terminal of the current switch control unit and is electrically connected to the power supply output terminal of the power input unit. The output terminal of the switch subunit is electrically connected to the input terminal of the current control subunit. The output terminal of the current control subunit serves as the output terminal of the current switch control unit and is electrically connected to the controlled terminal of the inoculation ring heating unit.
[0019] In one possible design, the switching subunit includes a first switch, and the current control subunit includes a first resistor, a second capacitor, and a first MOSFET.
[0020] Wherein, one end of the first switch serves as the input terminal of the switch subunit and is electrically connected to the power supply output terminal of the power input unit, and the other end of the first switch serves as the output terminal of the switch subunit and is electrically connected to the input terminal of the current control subunit;
[0021] The gate of the first MOS transistor serves as the input terminal of the current control subunit and is electrically connected to the first switch. The gate of the first MOS transistor is electrically connected to the source of the first MOS transistor through the first resistor. The gate of the first MOS transistor is also electrically connected to one end of the second capacitor, and the other end of the second capacitor is grounded. The drain of the first MOS transistor serves as the output terminal of the current switch control unit and is electrically connected to the controlled terminal of the inoculation ring heating unit.
[0022] In one possible design, the current switch control unit further includes an operating status indication subunit;
[0023] The input terminal of the operating status indicator subunit is electrically connected to the drain of the first MOS transistor, and the output terminal of the operating status indicator subunit is grounded.
[0024] In one possible design, the operating status indicator subunit includes a second resistor and a first light-emitting diode;
[0025] Wherein, one end of the second resistor serves as the input terminal of the operating status indicator subunit and is electrically connected to the drain of the first MOS transistor, the other end of the second resistor is electrically connected to one end of the first light-emitting diode, and the other end of the first light-emitting diode serves as the output terminal of the operating status indicator subunit and is grounded.
[0026] In one possible design, the first MOS transistor is a PMOS transistor.
[0027] Beneficial Effects: This utility model provides a control circuit for an electrocautery inoculation ring, including: an inoculation ring heating unit, a power input unit, and a current switch control unit; wherein, the power input terminal of the power input unit is electrically connected to an external mains power supply, the power output terminal of the power input unit is electrically connected to the input terminal of the current switch control unit, and the output terminal of the current switch control unit is electrically connected to the controlled terminal of the inoculation ring heating unit. By controlling the conduction and cutoff of current through the current switch control unit, the current carrying capacity can be effectively improved, the safety hazard of switch burnout can be avoided, and the safety of using the electrocautery inoculation ring can be improved. Attached Figure Description
[0028] Figure 1 This is a functional block diagram of the electrocautery inoculation ring control circuit in Embodiment 1 of this utility model;
[0029] Figure 2 This is a circuit connection diagram of the current switch control unit of the electrocautery inoculation ring control circuit in Embodiment 2 of this utility model.
[0030] The components include: 1. Inoculation ring heating unit; 2. Power input unit; 3. Current switch control unit;
[0031] LED1, first light-emitting diode; LED2, second light-emitting diode; R1, first resistor; R2, second resistor; R3, third resistor; C1, first capacitor; C2, second capacitor; Q1, first MOSFET; SW1, first switch. Detailed Implementation
[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.
[0033] It should be understood that although the terms first, second, etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, the first unit may be referred to as the second unit, and similarly, the second unit may be referred to as the first unit, without departing from the scope of the exemplary embodiments of this utility model.
[0034] It should be understood that the term "and / or" that may appear in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" that may appear in this document describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " that may appear in this document generally indicates that the related objects before and after it are in an "or" relationship.
[0035] Example 1:
[0036] like Figure 1As shown, this embodiment provides an electrocautery inoculation ring control circuit, including: an inoculation ring heating unit 1, a power input unit 2, and a current switch control unit 3;
[0037] The power input terminal of the power input unit 2 is electrically connected to the external mains power, the power output terminal of the power input unit 2 is electrically connected to the input terminal of the current switch control unit 3, and the output terminal of the current switch control unit 3 is electrically connected to the controlled terminal of the inoculation ring heating unit 1.
[0038] It should be noted that the electrocautery inoculation ring control circuit in this embodiment processes the mains power through the power input unit 2 and controls the conduction and cutoff of the current through the current switch control unit 3. Especially when dealing with large currents, it can effectively improve the current carrying capacity of the circuit, ensure that the current passing through the switch is within a reasonable operating range, effectively avoid the safety hazard of switch burnout, and thus improve the safety of using the electrocautery inoculation ring.
[0039] Example 2:
[0040] like Figure 2 As shown, this embodiment provides an electrocautery inoculation ring control circuit. In one possible implementation, the inoculation ring heating unit 1 includes a heating wire.
[0041] The heating wire serves as the controlled end of the inoculation ring heating unit 1 and is electrically connected to the output end of the current switch control unit 3.
[0042] In one possible implementation, the power input unit 2 includes a voltage conversion subunit and a power filtering subunit;
[0043] The AC input terminal of the voltage conversion subunit serves as the power input terminal of the power input unit 2 and is electrically connected to an external 220V AC mains power supply. The DC output terminal of the voltage conversion subunit is electrically connected to the input terminal of the power filtering subunit. The filtered current output terminal of the power filtering subunit serves as the power output terminal of the power input unit 2 and is electrically connected to the input terminal of the current switch control unit 3.
[0044] In one possible implementation, the voltage conversion subunit includes a 220V-12V step-down converter, a bridge rectifier circuit, and an LC filter circuit.
[0045] The primary terminal of the 220V-12V step-down transformer serves as the AC input terminal of the voltage conversion subunit and is electrically connected to the external 220V AC mains power. The secondary terminal of the 220V-12V step-down transformer is electrically connected to the first and second input terminals of the bridge rectifier circuit. The first and second output terminals of the bridge rectifier circuit are electrically connected to the input terminal of the LC filter circuit. The output terminal of the LC filter circuit serves as the DC output terminal of the voltage conversion subunit and is electrically connected to the input terminal of the power supply filter subunit.
[0046] In one possible implementation, the power filtering subunit includes a third resistor R3, a first capacitor C1, and a second light-emitting diode LED2;
[0047] Wherein, one end of the third resistor R3 is electrically connected to one end of the first capacitor C1, and the common connection of the third resistor R3 and the first capacitor C1 serves as the input terminal of the power supply filtering subunit and is electrically connected to the DC output terminal of the voltage conversion subunit. The other end of the third resistor R3 is electrically connected to one end of the second light-emitting diode LED2, and the other end of the second light-emitting diode LED2 is electrically connected to the other end of the first capacitor C1. The common connection of the second light-emitting diode LED2 and the first capacitor C1 serves as the filter current output terminal of the power supply filtering subunit and is electrically connected to the input terminal of the current switch control unit 3.
[0048] In one possible implementation, the current switch control unit 3 includes a switch subunit and a current control subunit;
[0049] The input terminal of the switch subunit serves as the input terminal of the current switch control unit 3 and is electrically connected to the power supply output terminal of the power input unit 2. The output terminal of the switch subunit is electrically connected to the input terminal of the current control subunit. The output terminal of the current control subunit serves as the output terminal of the current switch control unit 3 and is electrically connected to the controlled terminal of the inoculation ring heating unit 1.
[0050] In one possible implementation, the switching subunit includes a first switch SW1, and the current control subunit includes a first resistor R1, a second capacitor C2, and a first MOSFET Q1.
[0051] Wherein, one end of the first switch SW1 serves as the input terminal of the switch subunit and is electrically connected to the power supply output terminal of the power input unit 2, and the other end of the first switch SW1 serves as the output terminal of the switch subunit and is electrically connected to the input terminal of the current control subunit;
[0052] The gate of the first MOSFET Q1 serves as the input terminal of the current control subunit and is electrically connected to the first switch SW1. The gate of the first MOSFET Q1 is electrically connected to the source of the first MOSFET Q1 through the first resistor R1. The gate of the first MOSFET Q1 is also electrically connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is grounded. The drain of the first MOSFET Q1 serves as the output terminal of the current switch control unit 3 and is electrically connected to the controlled terminal of the inoculation ring heating unit 1.
[0053] It should be noted that MOSFET stands for Metal Oxide Semiconductor Field-Effect Transistor, a type of field-effect transistor, specifically an insulated-gate type. In this embodiment, the first MOSFET Q1 is preferably an AO4435 PMOS transistor. The first switch, among possible choices, is a TS3425BA tactile switch with a contact current of 50mA. By using the AO4435 MOSFET in the control circuit provided in this embodiment to cut off the voltage, its safe operation can be ensured.
[0054] In one possible implementation, the current switch control unit 3 further includes an operating status indication subunit;
[0055] The input terminal of the operating status indicator subunit is electrically connected to the drain of the first MOS transistor Q1, and the output terminal of the operating status indicator subunit is grounded.
[0056] In one possible implementation, the operating status indicator subunit includes a second resistor R2 and a first light-emitting diode LED1;
[0057] Wherein, one end of the second resistor R2 serves as the input terminal of the working status indicator subunit and is electrically connected to the drain of the first MOS transistor Q1, the other end of the second resistor R2 is electrically connected to one end of the first light-emitting diode LED1, and the other end of the first light-emitting diode LED1 serves as the output terminal of the working status indicator subunit and is grounded.
[0058] In one possible implementation, the first MOS transistor Q1 is a PMOS transistor.
[0059] It should be noted that the full name of PMOS transistor is Positive channel Metal Oxide Semiconductor Field-Effect Transistor. This embodiment uses a PMOS transistor because its conduction and cutoff are determined by the gate-source voltage (V0).GS It was determined that, compared to NMOS transistors, PMOS transistors are more suitable for transmitting high-level signals (the input voltage connected to the source of the first MOS transistor Q1). Furthermore, PMOS transistors do not require additional charge and can be directly turned off with a low-level signal, making them more suitable for the specific implementation scenario in this embodiment. Specifically:
[0060] When V GS ≤V Th At the threshold voltage: When a sufficiently low voltage (relative to the source) is applied to the gate of the first MOS transistor Q1, a P-type conductive channel is formed, and the source and drain of the first MOS transistor Q1 are turned on, and the current flows from the source to the drain (the switch is "closed").
[0061] When V GS >V Th At the threshold voltage: the P-type conductive channel disappears, and the source and drain of the first MOS transistor Q1 are cut off (the switch is "open");
[0062] In the specific implementation of this embodiment, the threshold voltage V Th Select a value within the range of -0.7V to 1.5V.
[0063] This PMOS transistor design effectively regulates the current, protecting the switch in practical use and ensuring that the current flowing through the switch remains within an acceptable range, thus preventing the switch from burning out.
[0064] In one possible implementation, a backup power supply unit is also included;
[0065] The backup power supply unit is electrically connected to the input terminal of the current switch control unit 3, and the backup power supply unit includes a rechargeable battery.
[0066] In scenarios where portability is required, the backup power unit can help users complete the sterilization process through the electrocautery inoculation loop control circuit provided in this embodiment when there is no mains power connection, thereby improving the portability of the electrocautery inoculation loop.
[0067] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A control circuit for an electrocautery inoculation ring, characterized in that, include: The inoculation ring heating unit (1), the power input unit (2), and the current switch control unit (3) are included. The power input terminal of the power input unit (2) is electrically connected to the external mains power, the power output terminal of the power input unit (2) is electrically connected to the input terminal of the current switch control unit (3), and the output terminal of the current switch control unit (3) is electrically connected to the controlled terminal of the inoculation ring heating unit (1).
2. The electrocautery inoculation ring control circuit according to claim 1, characterized in that, The inoculation ring heating unit (1) includes a heating wire; The heating wire serves as the controlled end of the inoculation ring heating unit (1) and is electrically connected to the output end of the current switch control unit (3).
3. The electrocautery inoculation ring control circuit according to claim 1, characterized in that, The power input unit (2) includes a voltage conversion subunit and a power filtering subunit; The AC input terminal of the voltage conversion subunit serves as the power input terminal of the power input unit (2) and is electrically connected to the external 220V AC mains power. The DC output terminal of the voltage conversion subunit is electrically connected to the input terminal of the power filter subunit. The filter current output terminal of the power filter subunit serves as the power output terminal of the power input unit (2) and is electrically connected to the input terminal of the current switch control unit (3).
4. The electrocautery inoculation ring control circuit according to claim 3, characterized in that, The voltage conversion subunit includes a 220V-12V step-down converter, a bridge rectifier circuit, and an LC filter circuit; The primary terminal of the 220V-12V step-down transformer serves as the AC input terminal of the voltage conversion subunit and is electrically connected to the external 220V AC mains power. The secondary terminal of the 220V-12V step-down transformer is electrically connected to the first and second input terminals of the bridge rectifier circuit. The first and second output terminals of the bridge rectifier circuit are electrically connected to the input terminal of the LC filter circuit. The output terminal of the LC filter circuit serves as the DC output terminal of the voltage conversion subunit and is electrically connected to the input terminal of the power supply filter subunit.
5. The electrocautery inoculation ring control circuit according to claim 3, characterized in that, The power filtering subunit includes a third resistor (R3), a first capacitor (C1), and a second light-emitting diode; Wherein, one end of the third resistor (R3) is electrically connected to one end of the first capacitor (C1), and the common connection of the third resistor (R3) and the first capacitor (C1) serves as the input terminal of the power supply filtering subunit and is electrically connected to the DC output terminal of the voltage conversion subunit. The other end of the third resistor (R3) is electrically connected to one end of the second light-emitting diode, and the other end of the second light-emitting diode is electrically connected to the other end of the first capacitor (C1). The common connection of the second light-emitting diode and the first capacitor (C1) serves as the filter current output terminal of the power supply filtering subunit and is electrically connected to the input terminal of the current switch control unit (3).
6. The electrocautery inoculation ring control circuit according to claim 1, characterized in that, The current switch control unit (3) includes a switch subunit and a current control subunit; The input terminal of the switch subunit serves as the input terminal of the current switch control unit (3) and is electrically connected to the power supply output terminal of the power input unit (2). The output terminal of the switch subunit is electrically connected to the input terminal of the current control subunit. The output terminal of the current control subunit serves as the output terminal of the current switch control unit (3) and is electrically connected to the controlled terminal of the inoculation ring heating unit (1).
7. The electrocautery inoculation ring control circuit according to claim 6, characterized in that, The switching subunit includes a first switch (SW1), and the current control subunit includes a first resistor (R1), a second capacitor (C2), and a first MOSFET (Q1). Wherein, one end of the first switch (SW1) serves as the input end of the switch subunit and is electrically connected to the power supply output end of the power input unit (2), and the other end of the first switch (SW1) serves as the output end of the switch subunit and is electrically connected to the input end of the current control subunit; The gate of the first MOS transistor (Q1) serves as the input terminal of the current control subunit and is electrically connected to the first switch (SW1). The gate of the first MOS transistor (Q1) is electrically connected to the source of the first MOS transistor (Q1) through the first resistor (R1). The gate of the first MOS transistor (Q1) is also electrically connected to one end of the second capacitor (C2), and the other end of the second capacitor (C2) is grounded. The drain of the first MOS transistor (Q1) serves as the output terminal of the current switch control unit (3) and is electrically connected to the controlled terminal of the inoculation ring heating unit (1).
8. The electrocautery inoculation ring control circuit according to claim 7, characterized in that, The current switch control unit (3) also includes a working status indication subunit; The input terminal of the operating status indicator subunit is electrically connected to the drain of the first MOS transistor (Q1), and the output terminal of the operating status indicator subunit is grounded.
9. The electrocautery inoculation ring control circuit according to claim 8, characterized in that, The operating status indicator subunit includes a second resistor (R2) and a first light-emitting diode; Wherein, one end of the second resistor (R2) serves as the input terminal of the operating status indicator subunit and is electrically connected to the drain of the first MOS transistor (Q1), the other end of the second resistor (R2) is electrically connected to one end of the first light-emitting diode, and the other end of the first light-emitting diode serves as the output terminal of the operating status indicator subunit and is grounded.
10. The electrocautery inoculation ring control circuit according to claim 7, characterized in that, The first MOS transistor (Q1) is a PMOS transistor.